SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
AUTOMATIC SOURCE TRANSFER WITH SEL-451
BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 1
INSTRUCTIONS FOR OPERATION
Automatic Source Transfer With SEL-451 Relay For Operation
Between Two Sources With Split Bus (Two Source Main-Tie-Main)
Figure 1. The SEL-451 Automatic Transfer Control (ATC) is on a hinged panel inside a
secure, low-voltage compartment that is mounted in the bus-tie switch enclosure
door. An uninterruptable power supply (see Figure 3) may also be mounted in the
enclosure door above the ATC.
Qualified Persons
WARNING
The equipment covered by this publication must be selected for a specific
application and it must be operated and maintained by Qualified Persons who
are thoroughly trained and knowledgeable in the installation, operation, and
maintenance of underground power distribution equipment along with the
associated hazards that may be involved. This publication is written only for
such qualified persons and is not intended to be a substitute for adequate
training and experience in safety procedures for this type of equipment. Proper
installation is the responsibility of the operating and construction personnel
and the utility performing and authorizing the work. Completion of these
instructions implies no further warranty by the manufacturer.
A Qualified Person is defined in the National Electrical Code (NEC/NFPA-70) as:
One who has skills and knowledge related to the construction and operation
of the electrical equipment and installations and has received safety training
to recognize and avoid the hazards involved.
The specific electrical safety training requirements to be considered a qualified
person are detailed in NFPA-70E, Article 110.1(D), Employee Training. Some of
the requirements from the 2012 edition are shown in the next column. For the
specific detailed training requirements for a Qualified Person make certain to
refer to the most recent applicable edition of NFPA-70E.
These training requirements would include, but are not limited to, the following key points:
• The skills and techniques necessary to distinguish exposed energized parts
from other parts of electrical equipment.
• The skills and techniques necessary to determine the proper approach
distances corresponding to the voltages to which the qualified person will
be exposed.
• The proper use of the special precautionary techniques, personal protective equipment, insulating and shielding materials, and insulated tools for
working on or near exposed energized parts of electrical equipment.
• Tasks performed less often than once per year have additional training
requirements.
These instructions are intended only for such qualified persons. They are not
intended to be a substitute for adequate training and experience in safety
procedures for this type of equipment. Additionally, the recommendations
in this instruction bulletin are not intended to supersede or to take the place
of established utility or user safety guidelines and established practices. If
there is any question, consult with your foreman or supervisor, as appropriate.
Please refer to OSHA 29 CFR 1910.399 and NFPA 70E Articles 100 and 110.
1075 Old Airport Road • Bristol, VA 24201 Phone (276) 669-4084 • FAX (276) 645-8206 • www.federalpacific.com • ISO9001:2015
© 2021 Electro-Mechanical, LLC
SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
AUTOMATIC SOURCE TRANSFER WITH SEL-451
BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 2
TABLE OF CONTENTS
Warning - Qualified Persons..........................................................1
Safety Information.....................................................................3
Safety Precaution............................................................................. 3
Following Safety Instructions...................................................... 3
Replacement Instructions and Labels....................................... 3
Storage Requirements.................................................................... 3
1.0 Overview on Components................................................... 4
1.1 Overview on the SEL-451 Relay................................ 4
1.2 Overview on UPS........................................................... 6
1.3 Overview on Current-Unbalance Relay..................7
1.4
Overview on Motor Operator.............................................. 8
2.0 Overview on Automatic and Manual Operation.......... 9
2.1 Overview on Automatic Operation................................... 9
2.1.1 Overview on Typical Split-Bus
(Main-Tie-Main) Primary-Selective Scheme.......... 9
2.1.2 Overview of Typical One-Line Diagram for
Split-Bus Primary-Selective Scheme..................10
2.2 Overview on Response to Over-Currents......................10
2.2.1 Overview on Over-Currents
Internal to the Switchgear.............................. 11
2.2.2 Overview on Over-Currents
External to the Switchgear............................. 11
2.3
Overview on Manual Operation.........................................12
2.3.1 Overview on Manual Mechanical Operation.......
12
2.3.2 Overview on Manual Electrical Operation.12
3.0 Overview on System Operation....................................... 13
3.1 Overview on Normal Operation.............................. 13
3.2 Overview on Loss-of-Source Voltage.................. 13
3.3 Overview on Return-of-Source Voltage.............. 13
3.4 Overview on Transfer on Unbalanced Voltage.........14
3.5 Overview on Over-Current Conditions ..............14
3.5.1 Overview on Suspend Mode ........................14
3.5.2 Overview on Lockout Mode ....................14
3.5.3 Overview on Reset Over-Current Lockout.14
3.5.4 Overview on Feeder Current Unbalance..14
4.0 Initial Start-Up Procedure..................................................14
4.1 Preliminary Considerations .....................................14
4.2 Power on the UPS........................................................ 15
4.2.1 Falcon Brand UPS............................................. 15
4.2.2 Energizing Incoming Components.............16
4.3 Installing SEL-451 Relay Settings ...........................16
4.3.1 Using AcSELerator Quickset®........................ 17
5.2 Local Operation........................................................... 20
5.2.1 Open/Close Source and Tie Switches..... 20
5.2.2 Hold Return ...................................................... 20
5.2.3 Lockout................................................................. 21
5.3 Motor Operator Operation....................................... 21
5.3.1 Type ME Motor Operator Features............. 21
5.3.2 Motorized Operation ...................................... 21
5.3.3 Decoupler Operation....................................... 21
5.3.4 Handcranking....................................................22
5.4 Feeder-Bay Relay Operation....................................22
5.4.1 Operation of Current-Unbalance Relay...22
5.4.2 Install Settings on Current-Unbalance Relay.23
5.4.3 Reset Current-Unbalance Relay..................23
6.0 Alarms, Indication and Test...............................................24
6.1 SEL-451 Alarms and Indicators...............................24
6.1.1 Status LED Indicating Lamps......................24
6.1.2 OC Suspend LED Indicating Lamps..........24
6.1.3 Source Lockout LED Indicating Lamps....24
6.1.4 LCD Screen.........................................................25
a. Primary Display Points.............................25
b. Main Menu Screens....................................25
6.2 Event Reporting and Sequential Event Recorder
(SER)
25
6.2.1 Oscillography and Event Reporting..........25
6.2.2 Event Summary................................................25
6.2.3 Sequential Events Recorder (SER).............26
6.2.4 Access to Event Information........................26
6.3 Other Component Alarms & Capabilities...........26
6.3.1 Uninterruptible Power Supply......................26
6.3.2 Test Functions....................................................26
6.3.3 Duplex Receptacle............................................28
7.0 Maintenance .......................................................................29
7.1 Switch Maintenance...................................................29
7.2 Motor-Operator Maintenance................................29
7.3 Automatic Transfer Scheme....................................29
7.4 UPS Battery Maintenance........................................29
Appendix A - User Selectable Settings.................................. 30
Appendix A - Automatic Transfer Initial Test Procedure.. 31
Appendix B - Downloading Serial Events...........................32
Appendix C - Rotating LCD Display and Typical Main Menu
Screens 33
Appendix D - UPS Alarms and Status Displays...................36
4.3.2 Entering Transfer Settings....................................... 17
4.3.3 Installing Transfer Settings......................................18
5.0 Operation Description.........................................................18
5.1 Utility - Utility Operation..........................................19
5.1.1 Normal Operation.............................................19
5.1.2 Loss-of-Source Voltage..................................19
5.1.3 Return-of-Source Voltage.............................19
5.1.4 Transfer on Unbalanced Voltage..................... 19
5.1.5 Source-Side Over-Current Conditions... 20
a. Suspend Mode............................................ 20
b. Lockout Mode............................................. 20
c. Reset Over-Current Lockout................. 20
1075 Old Airport Road • Bristol, VA 24201 Phone (276) 669-4084 • FAX (276) 645-8206 • www.federalpacific.com • ISO9001:2015
SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
AUTOMATIC SOURCE TRANSFER WITH SEL-451
BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 3
SAFETY INFORMATION
Understanding Safety-Alert Messages
If you do not understand any portion of this instruction bulletin and
need assistance, contact Federal Pacific at 276-669-4084.
Replacement Instructions & Labels
There are several types of safety-alert messages which may appear
throughout this instruction bulletin as well as on labels attached If you need additional copies of this instruction bulletin, contact Federal
to the metal-enclosed switchgear. Familiarize yourself with these Pacific at 276-669-4084.
types of messages and the importance of the various signal words,
It is important that any missing, damaged, or faded labels on the
as explained below.
equipment be replaced immediately. Replacement labels are available
by contacting Federal Pacific.
DANGER
DANGER indicates a hazardous situation which, if not avoided, will
result in death or serious injury.
WARNING
WARNING indicates a hazardous situation which, if not avoided,
could result in death or serous injury.
CAUTION
CAUTION indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
NOTICE
NOTICE is used to address practices not related to physical injury.
SAFETY
INSTRUCTIONS
Safety Instructions (or equivalent) signs indicate specific safetyrelated instructions or procedures.
SAFETY PRECAUTION
DANGER
Auto-jet®II Switches, fuse mountings with appropriate fuses, motor
operators, automatic-transfer relays and over-current relays are
designed to protect equipment and to disconnect faulted equipment from the system. The Auto-jet®II Switches, fuse mountings
with appropriate fuses, motor operators, automatic-transfer relays
and overcurrent relays cannot protect personnel from injury or
electrocution if contact is made with energized circuits or hardware.
STORAGE REQUIREMENTS
If the automatic-transfer switchgear is to be stored and not energized
for any length of time, precautions must be taken to protect all the
components, such as switches, fuses, relays, meters, UPS (batteries),
etc. from the effects of the environment and deep discharge from lack
of a control-power source to energize low-voltage heater circuits.
Check the UPS to make certain all disconnected cables, which are
all labeled, are connected. Batteries and heaters must be connected
to a control-power source and care must be taken to make certain
that such connections do NOT inadvertently energize, or otherwise
back-feed the bus or other high-voltage and low-voltage components
in the switchgear.
For connection of space heaters to an external or internal power source
and for other storage requirements, refer to the wiring diagrams
procedures and instructions in sections of Instruction Bulletin IB-3A310LP that is furnished with the metal-enclosed switchgear as follows:
1. The “DANGER” box on page 3 of Instruction Bulletin IB3A-310LP, titled “INSTRUCTION MANUAL Metal-Enclosed
Switchgear Indoor and Outdoor Distribution 2400 volts
through 34,500 volts”.
2. The “DANGER” box on page 4 of Instruction Bulletin IB3A-310LP titled “INSTRUCTION MANUAL Metal-Enclosed
Switchgear Indoor and Outdoor Distribution 2400 volts
through 34,500 volts”.
3. The Section titled “STORAGE” on pages 5 of Instruction
Bulletin IB-3A-310LP titled “INSTRUCTION MANUAL MetalEnclosed Switchgear Indoor and Outdoor Distribution 2400
volts through 34,500 volts”.
4. The “CAUTION” box on page 6 in the Section titled “INSTALLATION” of Instruction Bulletin IB-3A-310LP titled
“INSTRUCTION MANUAL Metal-Enclosed Switchgear Indoor
and Outdoor Distribution 2400 volts through 34,500 volts”.
Following Safety Instructions
NOTICE
Thoroughly and carefully read this instruction bulletin before
installation of the metal-enclosed switchgear, before switching or
operating the switches, fuses, motor operators and overcurrent
relays in this equipment, and before performing any maintenance
on the equipment.
1075 Old Airport Road • Bristol, VA 24201 Phone (276) 669-4084 • FAX (276) 645-8206 • www.federalpacific.com • ISO9001:2015
SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
AUTOMATIC SOURCE TRANSFER WITH SEL-451
BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 4
1.0 OVERVIEW ON COMPONENTS
This section is provided to give the user a general overview
description on the basic components utilized in the Federal
Pacific Automatic-Transfer Metal-Enclosed Switchgear as a
means to gain familiarity with the components. These overviews are not intended to cover actual operational actions
to initiate, which will be described in the sections that cover
operation procedures that are in Sections 4.0, 5.0 and 6.0.
1.1 Overview on the SEL-451 Relay
The SEL-451 relay is a complete, preprogrammed standalone
protection and automatic-transfer control that only requires
the user to input the particular field-selectable system operating parameters that are to apply. The parameters are simply
input into the relay using a laptop computer and the AcSELerator Quickset® software, which is a proprietary software
package of SEL (Schweitzer Engineering Laboratories Inc.).
A user registered version allowing input of the parameters is
provided with each automatic-transfer switchgear assembly.
The three-switch split-bus (main-tie-main) automatic sourcetransfer scheme features three (3) motor-operated Auto-jet® II
Load-Interrupter Switches that open and close in response to
system disturbances based on the pre-programmed scheme
and the selected operating parameters input into the SEL451 relay. The field-selectable operating parameters, which
are described in more detail in Section 4.0 Initial Start-Up
Procedure and in Appendix A, are shown in adjacent Table 1.
Table I. User Selectable Settings
SETTING
DESCRIPTION
CTR SOURCE 1
CT ratio for Source 1
CTR SOURCE 2
CT ratio for Source 2
PTR SOURCE 1
PT ratio for Source 1
PTR SOURCE 2
PT ratio for Source 2
SOURCE 1 CURRENT
SUPERVISION
Pickup value for overcurrent detection on
Source 1 and disregards voltage drop if
current is above this level
Pickup value for overcurrent detection on
Source 2 and disregards voltage drop if
current is above this level
Time after overcurrent with Source 1 loss
detected till lockout (both Source 1 and Tie
switches open)
Time after overcurrent with Source 2 loss
detected till lockout (both Source 2 and Tie
switches open)
SOURCE 2 CURRENT
SUPERVISION
OC_LOCKOUT1_TIMER
OC_LOCKOUT2_TIMER
SOURCE 1 INITIAL
TRANSFER DELAY
Time after Source 1 is lost before a transfer to
Source 2 (i.e. Tie Switch closes)
SOURCE 1 RETURN
TRANSFER DELAY
Time after Source 1 becomes healthy before
retransfer to Source 1 when “Auto Retransfer”
is set to “Y” (i.e. Tie Switch opens)
SOURCE 2 INITIAL
TRANSFER DELAY
Time after Source 2 is lost before a transfer
to Source 1 (i.e. Tie Switch closes)
SOURCE 2 RETURN
TRANSFER DELAY
Time after Source 2 becomes healthy before
retransfer to Source 2 when “Auto Retransfer”
is set to “Y” (i.e. Tie Switch opens)
AUTO RETRANSFER
Y - Enable Auto Retransfer,
N - Hold for Retransfer
ALT_UNHEALTHY_
BYPASS_HOLD_TIMER
While Hold Return is waiting, if the Serving
Source becomes unhealthy, auto retransfer
after delay
RETURN TRANSFER
SEQUENCE
Open or Closed
Return-Transfer sequence
level required to declare a dead
DEAD SOURCE VOLTAGE Voltage
source.
LIVE SOURCE VOLTAGE
Voltage level required to declare a live source.
VOLTAGE UNBALANCE
Zero sequence voltage required to declare a
voltage unbalance a bad source (3V0).
1075 Old Airport Road • Bristol, VA 24201 Phone (276) 669-4084 • FAX (276) 645-8206 • www.federalpacific.com • ISO9001:2015
SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
AUTOMATIC SOURCE TRANSFER WITH SEL-451
BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 5
The basic features on the faceplate of the SEL-451 relay are shown in Lamps. The detail and functionality of all the features on the faceplate
Figure 2 and include the LCD screen, Data Entry and Navigation Keys, are described in more detail in Section 5, Section 6 and Appendix C.
the Status LED Indicator Lamps, and Active Soft Keys with LED Indicator
1
2
5
3
6
7
8 9 10 11
12 13
4
Figure 2. Faceplate of the SEL-451 is illustrated above with key features enumerated and described below.
EIA/RS 232 Serial Port – For connection of laptop computer to
input or change operating parameters, or download (for example)
event log information
2. LCD Screen – Displays rolling screen of operating parameters
and includes a Main Menu of all display items but not all items
are supported or accessible. The LCD screen and its display items
are covered in more detail in Section 6 and in Appendix C
3. ESC (ESCape) Soft Key – provides facility to escape from a subordinate display screen within a particular point of information
to the next higher-level home screen
4. ENT (ENTer) Soft Key – provides facility to access display screens
and enter data and text (such as for date/time information)
5. Arrow Soft Keys – provides facility to stop a scrolling screen to
allow easier reading of the displayed information and to navigate
up, down, left or right within a display screen
6. “TRIP” LED – Illuminates to indicate that the SEL-451 relay has
initiated a transfer operation
7. “ENABLED” LED – Illuminates to indicate that all conditions
required to enable the SEL-451 relay to support an automatictransfer operation consistent with the settings of the operating
parameters have been met
1.
8. Status LEDs – Illuminate to indicate that the stated functional
status condition exists
9. Status Descriptors – Abbreviated descriptions for primary conditions that impact on whether or not the SEL-451 is enabled to
support an automatic-transfer operation (see Section 6.1 for full
text for each descriptor)
10. Target Reset Pushbutton – When pressed, resets (turns “off”)
“TRIP” LED if illuminated
11. Active Soft Keys – When pressed, initiate the stated open/close
action or reset/enable/view/bypass function (as applicable) (see
Section 2 and Section 5 for expanded description of how these
soft keys are used). Soft Keys are active only when the SEL-451 is
placed in the “MANUAL” mode.
12. Active Key LEDs – Illuminate to indicate that the stated action
condition exists or has occurred (see Section 5 for expanded
description of LED illumination colors and techniques)
13. Active Key Descriptor Labels – Provide description for the primary
function of the individual Active Keys (see Section 5 for expanded
meaning of the description labels)
1075 Old Airport Road • Bristol, VA 24201 Phone (276) 669-4084 • FAX (276) 645-8206 • www.federalpacific.com • ISO9001:2015
SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
AUTOMATIC SOURCE TRANSFER WITH SEL-451
BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 6
1.2 Overview on UPS
In the event control power is lost to the switchgear
operating components, such as the relay and motor
operators, the control scheme may be provided with
backup power from an uninterruptible power supply
(UPS), which is essentially a battery. The UPS also supplies support information and inputs to the relay and, if
installed, can provide remote indication of status conditions. For example, the UPS may provide alarms, when it
loses control power and when the output voltage is low.
5
3
4
2
1
There are many types of UPS units and, therefore, the
user is directed to the packet of drawings and instruction manuals provided with the switchgear to find
publications on the specific UPS that, if furnished, has
been supplied. This instruction bulletin will cover only
the Falcon® brand SSG series UPS. See Figures 3 and 4. Figure 3. Faceplate of Falcon® brand SSG series Uninterruptible Power Supply.
The user needs to make certain to review and become
familiar with the information contained in the Falcon
“Owner’s Operating Manual” on the SSG Series UPS.
Model SSG3KRM-2 is featured in this Federal Pacific
Instruction Bulletin IB-9D-900 and the information
herein is not a substitute for being knowledgeable of
the complete Falcon “Owner’s Operating Manual”, which
also covers important topics such as setup procedures,
maintenance and troubleshooting.
6
7
8
1. Input On/Off Circuit Breaker
2. LCD Display — Displays all indicators and icons for alarms and other conditions
3. Function/Test Button — Initiates UPS Setup mode in combination with Set/
Alarm button and performs a manual battery test
4. Set/Alarm-Silence Button — Disables audible alarm, scrolls various UPS parameters on LCD display, and when in setup mode, sets configuration changes
5. Bypass/Off Button — Transfers UPS load directly to input power source;
pressing a second time returns to normal on-line mode; changes to Bypass
Mode automatically on Over Temperature, Overload, and Fault In the Battery
or UPS electronics. When in bypass mode, if input power source is lost, the
UPS output will turn off and the UPS will shut down.
9
10
11
12
13
Figure 4. Rear view of Falcon brand SSG Series UPS. Cover plate over rear of low-voltage
compartment has been removed to show components.
6.
7.
8.
9.
10.
11.
12.
13.
Control-Power Receptacle – Provides receptacle for control-power cable input to UPS (not part of UPS)
Input Control-Power Cable – Connects control power to input receptacle on UPS
Reset Button for Circuit Breaker on 30A 125v Outlet – Not Used
Output Control-Power Cable – Connects UPS control-power output to the low-voltage load circuit
Reset Button for Circuit Breaker on Load Circuit of Conventional Outlets – Press to reset circuit breaker
Cooling Fan
Battery Inter-Connect Cable – Inter-connects UPS and battery packs
Battery Circuit Breaker – Used to disconnect battery load circuit; battery is “hot” switchable
1075 Old Airport Road • Bristol, VA 24201 Phone (276) 669-4084 • FAX (276) 645-8206 • www.federalpacific.com • ISO9001:2015
SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
AUTOMATIC SOURCE TRANSFER WITH SEL-451
BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 7
1.3 Overview on Current-Unbalance Relay
The current-unbalance relay provides switching intelligence to motoroperated feeder switches. See Figure 5A. It is designed to monitor
three-phase AC current (or compare three single-phase AC currents)
and initiates a switching operation when the current unbalance exceeds the selected threshold level for a period of time exceeding the
selected time delay.
The current-unbalance relay is mounted in a low-voltage compartment
that is on the enclosure door (see Figure 5B) of each motor-operated
feeder bay. Inside the low-voltage compartments of these feeder
bays are the Switch-Position Indicating Lamps, the Trip-Indicator
Lamp, and the Reset Pushbutton, which are all mounted on a hinged
panel (see Figure 5C).
Behind the hinged panel (see Figure 5D) is the Current-Unbalance
Relay with its terminal blocks, along with the shorting-type terminal
block for the associated sensing current transformers plus the terminal
blocks and protection for the low-voltage circuits in the bay, which Figure 5B. Low-Voltage Compartments for motor-operated feeder bays
include the heater, convenience outlet and the interlock switch for furnished with an optional Current-Unbalance Relay are mounted on the door
the door-position indication.
of the switchgear enclosure. Optional convenience outlet (at lower right in
The current-unbalance relay considers zero current (loss of all threephases) as balanced, in which case, the relay stays energized and no
switching occurs.
1
2
3
photo above) may be provided on some bays.
4
6
Figure 5C. Internal hinged panel of Low-Voltage Compartments for motoroperated feeder bays furnished with an optional Current-Unbalance Relay
includes indicating lamps to show switch Open/Close Position and Trip condition
of the Current-Unbalance Relay, plus a Pushbutton to allow a manual RESET of
the relay after a trip operation has occurred. If the pushbutton is not provided,
the relay can automatically reset upon restoration of correct current balance, or
a normally-closed momentary switch can be connected for a manual reset (as
provided for this installation).
5
Figure 5A. Current-Unbalance Relay provides protection from single-phase
conditions resulting from blown feeder fuses. Items in the low-voltage
compartment and key features on the relay are marked above and identified
below.
1. Unbalanced Indicating Lamp — Illuminates yellow when unbalance
occurs
2. Percent-Unbalance Dial — Turns to adjust percent unbalance setting
3. Time-Delay Dial — Turns to adjust time delay setting
4. Tripped Indicating Lamp — Illuminates red when actuates switch to
open
5. Shorting-Type Terminal Block — For connections from current
transformers
6. Circuit-Breaker and Terminal Block — For low-voltage circuits in
Figure 5D. The Current-Unbalance Relay together with its terminal block is
each feeder bay
mounted behind the hinged panel along with the shorting-type terminal block
for the associated CTs, and the terminal blocks with protective devices for
the other low-voltage components (heaters, convenience outlet, and doorinterlock switch) located in the same bay.
1075 Old Airport Road • Bristol, VA 24201 Phone (276) 669-4084 • FAX (276) 645-8206 • www.federalpacific.com • ISO9001:2015
SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
AUTOMATIC SOURCE TRANSFER WITH SEL-451
BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 8
1.4 Overview on Motor Operator
Federal Pacific Type ME Motor Operators provide motor operation of
Auto-jet® II Load-Interrupter Switches in automatic source-transfer,
remote-control, supervisory-control and SCADA-controlled applications. These motor operators are mounted vertically in the enclosure
stile of the switchgear bay, replacing the manual switch-operating
handle and thereby require no additional space than is normally required for a manually-operated switch.
The motor actuates a chain-driven, jackshaft arrangement that charges
and trips the switch-operating mechanism, effecting switch opening or closing operations in approximately 3-4 seconds. Thus, the
transfer time (ignoring any intentional time delay) for an automatictransfer operation is approximately 6-8 seconds from the instant the
1st switch starts to open until the 2nd switch closes to complete the
circuit-transfer function.
The motor operator is furnished with an OPEN/CLOSE toggle switch
that has a center “OFF” position and with a LOCAL/REMOTE toggle
switch. The LOCAL/REMOTE toggle switch must be in REMOTE for
automatic-transfer operations to be initiated by the SEL-451 relay or
trip operations initiated by the Current-Unbalance Relay can occur.
Additionally, the LOCAL/REMOTE toggle switch must be in LOCAL
to enable the OPEN/CLOSE toggle switch so that manual electrical
switching operations can be performed. See Figure 6.
To avoid a potential misoperation condition of the SEL-451, DO NOT
open or close the switches associated with the automatic-transfer
application (i.e. incoming switches and tie switch) using the motoroperator OPEN/CLOSE Toggle Switch. Switches associated with the
automatic-transfer application should only be opened and closed using
the active pushbuttons on the front of the SEL-451 relay.
When the motor operator of a switch associated with the automatictransfer application (i.e. incoming and tie switches) is placed in LOCAL, a particular reset procedure must be followed to make certain
the SEL-451 is appropriately engaged and ready for a subsequent
automatic operation. The Reset Procedure will be discussed in more
detail in Section 2.3.2.
NOTICE
A particular Initial Start-Up Procedure must be followed in a specific
sequence when the switchgear assembly is to be first energized.
This sequence is covered in Section 4.0 Initial Start-Up Procedure.
A black label “INITIAL START-UP” covering these procedures is also
placed on the enclosure adjacent to the door of the low-voltage
compartment of the SEL-451. Failure to follow the specified start-up
sequence may result in damage to equipment or cause the system
to operate incorrectly.
1
2
2
7
3
3
4
5
6
Figure 6. Views above show the Type ME Motor Operator with the associated Decoupler that allows the motor to be disconnected from the switch; the
mechanical door interlock that allows opening the door only when the switch is decoupled (as shown in view at right) and prevents opening the door when the
switch is coupled (as shown in view at left); the OPEN/CLOSE and LOCAL/REMOTE toggle switches; the Operation Counter; and the Receptacle for connecting to
the Hand-Held Controller that allows operation from an adjacent location within 50 feet.
1. Receptacle for Hand-Held Controller
2. Mechanical Door Interlock - prevents Opening Door Unless Motor Operator is Decoupled (as shown in photo at right); Coupled condition is pictured at
left (mating part on door is not shown) for comparison only (shown with door open and interlock defeated for clarity)
3. Decoupler - Shown pulled out (Coupled) at left; shown pushed in (Decoupled) at right; Padlock tab is suspended in appropriate slot
4. OPEN/CLOSE Toggle Switch
5. LOCAL/REMOTE Toggle Switch
6. Operation Counter
7. Manual Operation Access Port — Provides access to Manual-Operating Shaft. When decoupled, running motor is stopped by raising the cover that is
over the port
1075 Old Airport Road • Bristol, VA 24201 Phone (276) 669-4084 • FAX (276) 645-8206 • www.federalpacific.com • ISO9001:2015
SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
AUTOMATIC SOURCE TRANSFER WITH SEL-451
BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 9
2.0 OVERVIEW ON AUTOMATIC AND MANUAL
OPERATION
2.1 Overview on Automatic Operation
Recognize too that there may be separately mounted controls that
augment the programmed functions of the SEL-451. These additional
controls provide expanded functionality for the automatic-transfer
scheme and often provide important test capabilities. These separately
mounted controls may differ from those described herein and will be
covered by separate documentation (circuit diagrams and references)
on drawings and manufacturer’s product literature provided with the
switchgear.
section of bus with a normally-open tie switch between the two bus
sections, the switchgear configuration is referred to as a split-bus (or
main-tie-main) primary-selective scheme. This scheme provides increased reliability for the installation because two sources are available,
each serving a portion of the available load and each source typically
capable of carrying the entire load of both bus sections if either source
is lost or if maintenance needs to be performed on one of the source
circuits. Thus, for any particular outage event on a source circuit, it can
be anticipated that only one half of the load circuits will be impacted.
Automatic operations include those operations that are initiated
without any human machine interface (HMI). However, the automatic
This section is primarily provided to give the user a general overview
operations are established based on fixed settings programmed into
description on the automatic-transfer sequence. The overview provides
the intelligent components as well as field-selectable parameters that
the one-line diagram of a typical split-bus primary-selective switchgear
are programmed into the intelligent components during the initial
assembly, identifying the components included, and specifically describes
set-up of the equipment. Thus, these automatic operations will be
the actions that occur during an automatic-transfer process and during
initiated immediately when the parametric setting conditions are
over-currents external and internal to the switchgear. A short discussatisfied. The conditions usually involve only those instances where
sion is provided on manual mechanical operation. However, expanded
voltage is lost or reduced to a programmed level. When the conditions
detail is provided in describing the special requirements that apply when
identify that fault current may be involved, automatic operations usually
manual electrical operations are performed using toggle switches on
involve restraint on any switching until there is loss-of-voltage and no
the motor operator compared to using pushbuttons on the SEL-451
current flow. These over-current conditions are discussed separately.
relay. Additionally, procedures that apply when using optional hand-held
controllers are also discussed. Finally, there is frequent mention of the 2.1.1 Overview on Typical Split-Bus (Main-Tie-Main) Primaryconditions that apply when the motor operator is decoupled from the Selective Scheme
switch and manual electrical operations are performed.
When two utility sources each provide power through a switch to a
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SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
AUTOMATIC SOURCE TRANSFER WITH SEL-451
BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 10
2.1.2 Overview of Typical One-Line Diagram For Split-Bus
Primary-Selective Scheme
The one-line diagram for a typical basic three-switch, split-bus (MainTie-Main) automatic-transfer switchgear assembly is illustrated below
in Figure 7.The automatic-transfer control (ATC), which is an SEL-451
relay (mounted in a low-voltage compartment on the door of the
tie-switch bay), responds to the internal pre-programmed software
and to field-selectable settings (operating parameters). These user
selectable settings are shown as a list in Table 1 and also in Appendix
A as the screen format that will be shown when a laptop computer is
connected to the SEL-451 through the EIA/RS232 port.
Each incoming bay includes a motor-operated (MO) load-interrupter
switch, which respond to command inputs from the SEL-451 relay); a
set of lightning arresters for surge protection; a set of three voltage
transformers, providing voltage sensing on each phase and control
power for operation of the relays, heaters and other accessories
that may require control power; a set of three current transformers
providing current sensing for the over-current-lockout scheme. See
Figures 8A, 8B and 8C.
current condition occurs for a pre-selected period of time, the UBC
initiates a trip command for a switch opening operation of the associated feeder load-interrupter switch.
Under normal operating conditions one utility source (S1) is connected
to one incoming load-interrupter switch (SSw1) and supplies power to
a portion of the load (FSw1); the second utility source (S2) is connected
to a second incoming load-interrupter switch (SSw2) and provides
power to the other portion of the load (FSw2); the bus-tie switch
(BTS1) between the two sources is normally open; all motor-operated
switches are coupled; and the SEL-451 relay is in AUTO mode.
If voltage is lost on one source or is reduced below a pre-selected (field
programmable) level and, if the other source is considered healthy as
established by system parameters programmed in the SEL-451 relay,
then the incoming switch connected to the lost source will open and
the tie switch (BTS1) will close to allow all the load to be served by the
remaining good source.
Indications for source available, mode, door open and switch position among other conditions are displayed on the SEL-451 relay. In
The tie-switch bay includes a motor-operated load-interrupter switch addition, auxiliary position indicating lamps, status indicating lamps,
and the separately isolated SEL-451 relay. All motor operators are and auto/manual selector switches provide indication and selection
isolated from medium voltage and are mounted in the switchgear- facility for a variety of conditions.
bay stile adjacent to the edge of the enclosure door.
In this illustration, each feeder bay includes a motor-operated loadinterrupter switch for automatic switching in response to a current
unbalance; a set of three fuses for single-phase protection against
load-side over-currents; a set of three current transformers that
provide current sensing input; and an unbalance current (UBC) detector that responds to the current input from the CTs. If an unbalanced
FSw1
UBC
SSw1
M
O
M
O
2.2 Overview on Response to Over-Currents
The switchgear assembly may include current transformers in the incoming bays to provide current input to the SEL-451 relay for the optional
Over-Current Lockout scheme. In addition, current transformers also
may be provided, as an option, in feeder bays to provide sensing input
for current unbalance detection relays or for metering load current.
BTS1
ATC
SSw2
M
O
M
O
FSw2
UBC
M
O
T2
T1
S1
S2
Figure 7. Illustrated above is the one-line diagram for a basic three-switch (Main-Tie-Main) automatic-transfer switchgear assembly with feeder bays equipped
with an Unbalanced Current Detector relay. All switches are shown open, but when system conditions are normal and the assembly is in AUTO mode, switches S1,
S2, F1 and F2 are normally closed and Tie switch BTS1 is normally open.
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SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
AUTOMATIC SOURCE TRANSFER WITH SEL-451
BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 11
A
B
C
D
Figure 8. Photos A and B show 600v CTs applied for the over-current lockout scheme mounted over a through bushing in the bus-transition bay, which connects
to an incoming motor-operated load-interrupter switch. When incoming cables connect directly to the switch terminals of an incoming motor-operated switch
(as illustrated in the one-line diagram of Figure 7), the window-type CTs for the over-current lockout scheme would be mounted similar to the arrangement
shown in the photo C above, which actually shows the typical arrangement for the sensing CTs on a motor-operated feeder switch equipped with a currentunbalance detection scheme. The inset D at far right shows an optional door-interlock switch that shuts down all electrical operations if the enclosure door is
open and illuminates the “DOOR OPEN” LED on the faceplate of the SEL-451 relay.
The purpose of current transformers furnished will be specified on
drawings and separate instruction manuals will be furnished with the
switchgear assembly especially when relays are involved. Instruction
Bulletin IB-9D-900LP will provide a brief overview of the functionality
where CTs are used in combination with relays to initiate responses
when over-currents occur.
An in-depth discussion of the over-current lockout function is described
in Section 3.5 Overview on Over-Current Conditions and Section 5.1.5
Over-Current Conditions.
2.2.2 Overview on Over-Currents External to the
Switchgear
Over-currents external to the switchgear assembly will initiate a different response depending on whether the over-current condition
In automatic source-transfer schemes, a specific concern is to avoid a occurs on the line side (upstream of the CTs in the incoming bays) or
transfer operation that would close a switch into a fault, which would load side (downstream of the CTs in the feeder bays).
result in a significant disruptive event on an otherwise uninvolved
source. A protection scheme that prevents a source switch (or bus-tie (a) Line-side (upstream) over-currents, if three-phase, result in a lossof-source voltage to the associated bus section in the switchgear
switch) from being closed into a fault is often referred to as an overthat will initiate an automatic source transfer to the backup source
current lockout scheme.
in the sequence (i) open the incoming source switch and then (ii)
For over-current lockout schemes, CTs are provided on the incoming
close the bus-tie switch to restore power to the effected bus seccables (or bus) of each source. When an over-current is sensed by CTs
tion.
on the incoming cables either of two conditions will occur:
(b) Line-side (upstream) over-currents if single-phase and occurring
(a) The over-current quickly disappears, indicating that a protective
at the same voltage level as the switchgear assembly result in
device downstream of the CTs cleared the fault in which case no
a voltage unbalance and the SEL-451 relay will, if the unbalance
further response is needed; or,
results in a dead-source condition on the associated bus section,
initiate an automatic source transfer to the backup source in the
(b) The over-current persists and the next protective device immedisequence (i) open the incoming source switch and then (ii) close
ately upstream of the CTs clears the fault and results in a loss-ofthe bus-tie switch to restore power to the effected bus section.
source voltage (or unhealthy source). An over-current followed by
a loss-of-source voltage is interpreted by the SEL-451 relay as an (c) Load-side (downstream) over-currents will under normal circuminternal fault and the relay goes into a lockout mode; preventing
stances be cleared by the associated feeder fuse(s). If the resulting
the tie switch from closing and, on the dead-circuit condition,
outage is three-phase, no subsequent switching need occur. If the
opening the source switch on the faulted source circuit.
outage results in a single-phase condition and the feeder bay is
equipped with an current-unbalance detection relay, the associated switch will be tripped open to prevent single-phasing the
connected load.
2.2.1 Overview on Over-Currents Internal to the Switchgear
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SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
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BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 12
2.3 Overview on Manual Operation
automatic-transfer scheme) is used to initiate a local manual electrical
Manual operation applies to mechanical or electrical operations that operation. In addition, special precautions apply if the switch is DEcan be performed locally at the switchgear assembly as opposed to COUPLED. Therefore, pay particular attention to the “NOTICE” boxes
operations that can be performed remotely (such as SCADA-controlled in this bulletin and to the red labels on the switchgear.
functions) or automatically based on preprogrammed parameters
input to the automatic-transfer software program.
Enclosure bays that include motor operators are mechanically interlocked to prevent switch operation if the door is open. Mechanical
interlocks also prevent opening the door if the switch is closed or the
motor operator is coupled.
As an option, enclosure doors may also include an electrical interlock
that prevents all electrical operations if the door is open.
2.3.1 Overview on Manual Mechanical Operation
In the event control power is lost, all motor-operated switches can
be manually operated at the switchgear using a manual hand-crank
that is supplied with the switchgear assembly. The hand-crank (see
left view in Figure 9) may be shipped in a container with other loose
parts or may be installed on the inside of the door of a low-voltage
compartment.
Manual cranking is accomplished by placing the crank handle on the
crank shaft, which is located behind the cover over the Manual-Crank
Port. See Figure 9. The cover is interlocked so that while it is in the
raised position, no remote operation is possible.
2.3.2 Overview on Manual Electrical Operation
Local manual electrical operations are those operations that can be
initiated electrically while standing at (or nearby) the switchgear. Local manual electrical operations can be performed in three different
ways: (a) using the open/close toggle switch on the motor operator,
(b) using the open/close pushbuttons on the SEL-451 relay (only for
use with source and tie switches), and (c) using an optional hand-held
controller that can be tethered to an outlet on the switchgear.
NOTICE
When Manual Electric Operation is to be performed on a switch that
is DECOUPLED, starting the motor by using any of the three following
methods (described in 2.3.2.a, b and c that follow below, will result in
the motor running continuously. The motor can only be stopped by
raising the cover over the Manual-Crank shaft or removing all control
power from the motor. The motor will run because when DECOUPLED
the motor limit switch is bypassed.
(a) Using OPEN/CLOSE Toggle Switch on the Motor Operator (RECOMMENDED FOR FEEDER-BAY SWITCHES ONLY)
i. The motor operator must be placed in LOCAL.
ii. The toggle switch is moved toward the appropriate direction
of operation.
NOTICE
When actuating the motor operator of an incoming load-interrupter switch or the tie switch (i.e. switches associated with the
automatic-transfer scheme), if the Local/Remote selector switch
on the motor-operator control panel is moved to the “LOCAL”
position, a particular reset procedure must be followed at the
automatic-transfer control (i.e. SEL-451 relay). A red reminder label
“RESET AFTER LOCAL CONTROL” is placed adjacent to each applicable motor operator. The reset instructions are stated on a red
label “RESET PROCEDURE” placed adjacent to the door over the
automatic-transfer control (i.e. SEL-451 relay).
In all cases when performing local manual electrical operations, a threestep process must be followed. First, an initial permissive control must
be activated. Second, the manual electrical operation is initiated. And
third, the permissive control must be de-activated to allow automatic
control to resume. A particular “RESET PROCEDURE” (discussed and
described later) is necessary when the motor-operator toggle switch
of an incoming switch or tie switch (i.e. switches associated with the
A
B
iii. The motor operator must be returned to AUTO or, if an incoming
load-interrupter switch or tie switch (i.e. switches associated
with the automatic-transfer scheme) is involved, follow the
“RESET PROCEDURE”.
C
D
Figure 9. A manual hand crank (shown in the photo A above) is furnished with each switchgear assembly that includes a motor-operated switch. The hand crank
is only required if all control power is lost. The hand crank is to be installed on the manual-operating shaft (shown in photo C above) located behind the manualcranking port (shown in photo B above). Raising the port cover exposes the shaft and activates an interlock to prevent all electrical operations while the cover is
raised. If the switch is decoupled and the motor is operated, raising the cover will stop the running motor.
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SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
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BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 13
Operation of these Hand-Held Controllers is discussed in Section 6.3.2
(b) Using OPEN/CLOSE Pushbuttons on the SEL-451 Relay
(ONLY FOR SWITCHES ASSOCIATED WITH AUTOMATIC- “Test Functions”. When the Hand-Held Controllers are used and the
switches are decoupled the “NOTICE” below applies.
TRANSFER SCHEME)
i. The SEL-451 relay is placed in MANUAL.
ii. The appropriate OPEN/CLOSE pushbutton is pressed.
RESET AFTER LOCAL CONTROL
Toggling to “LOCAL” will disable all automatic and
REMOTE (or SCADA) control.
After returning back to “REMOTE” the RESET
PROCEDURE must be followed at the relay, or automatic
operation will not resume!
Label 1. Above label (“RESET AFTER LOCAL CONTROL”) is positioned adjacent
to the operation counter of each incoming switch and the tie switch and
applies when these switches are operated using the OPEN/CLOSE toggle
switch on the Type ME Motor Operator.
RESET PROCEDURE
1. Switch SS1 must be turned to the “MANUAL” position.
2. “REMOTE OR SCADA ENABLE” light must be off. If
it is on, de-select “REMOTE OR SCADA ENABLE” by
pushing the button next to the light.
3. Switch SS1 must be returned to the “AUTO” position.
Label 2. Above label (“RESET PROCEDURE”) is positioned on the enclosure
adjacent to the door of the low-voltage compartment to the SEL-451 and must
be performed after an incoming switch or the tie switch has been operated
using the OPEN/CLOSE toggle switch on the Type ME Motor Operator.
NOTICE
NOTICE
When the switch is DECOUPLED and the motor is started by local
operation to the “LOCAL” position, a particular reset procedure must
be followed at the automatic-transfer control (i.e. SEL-451 relay).
A red reminder label “RESET AFTER LOCAL CONTROL” is placed
adjacent to each applicable motor operator. The reset instructions
are stated on a red label “RESET PROCEDURE” placed adjacent to
the door over the automatic-transfer control (i.e. SEL-451 relay).
3.0 OVERVIEW ON SYSTEM OPERATION
This section is provided to give the user a general descriptive overview on how the automatic-transfer scheme utilized in the Federal
Pacific Automatic-Transfer Metal-Enclosed Switchgear is designed to
respond to various system disturbances as a means to gain familiarity with various responses to be expected by the SEL-451 relay and
the Current-Unbalance Relay. These overviews are not intended to
cover actual operational actions to initiate, which will be described
in the sections that cover operation procedures that are in Sections
4.0, 5.0 and 6.0.
3.1 Overview on Normal Condition
In a typical three-switch (Main-Tie-Main) Federal Pacific AutomaticTransfer Switchgear, the assembly is arranged with two bus sections
having an incoming-source switch connected to each bus section and
having a normally open bus-tie switch between the two bus sections.
A separate utility source is connected to each incoming-source switch
and supplies power to the load on that bus section. Thus, the normal
condition is with both incoming-source switches closed and supplying power to its associated bus section; the bus-tie switch open; the
motor operators coupled to the incoming-source switches and the
bus-tie switch; and the SEL-451 relay in the automatic mode. NOTE:
In the start-up mode (discussed in Section 4.0), the incoming source
switches and the bus-tie switches are open.
3.2 Overview on Loss-of-Source Voltage
On a loss-of-source voltage, whether a single-phase or a three-phase
voltage loss (or a reduction of the source voltage to the dead-source
voltage level) to an incoming-source switch and with the switchgear
in the Normal Condition, the change in voltage is detected by the SEL451 (through the shift in the output voltage of the associated voltage
transformer), which activates the affected Initial Transfer Delay Timer.
If the source voltage returns before the timer times out, the system
returns to the Normal Condition. If the timer finishes and the source
voltage is evaluated as a dead-source voltage, the switchgear will
(c) Using Optional Hand-Held Controller
perform switching that transfers the affected loads to the remaining
There may be two optional Hand-Held Controllers: one for use with good source.
the two incoming bays associated with Source1 and Source 2, which
can disconnect any phase on the two sources to test the automatic- 3.3 Overview on Return-of-Source Voltage
transfer scheme; and one for use with any of the motor-operated With the system now operating on the remaining good source, when
switches, which can open or close the switch in the enclosure to which the lost source is re-established (i.e. the source voltage is evaluated
the Hand-Held Controller is connected.
as a Live Source Voltage) the SEL-451 activates the Return Transfer Delay
timer. When the timer times out and if the voltage is still evaluated as a
Live Source Voltage, the SEL-451 will initiate a Return Transfer Sequence
back to the Normal Condition.
When the switch is DECOUPLED and the motor is started by
local opertaion, a particular reset procedure must be followed at
the automatic-transfer control (i.e. SEL-451 relay). A red reminder
label “RESET AFTER LOCAL CONTROL” is placed adjacent to each
applicable motor operator. The reset instructions are stated on a
red label “RESET PROCEDURE” placed adjacent to the door over
the automatic-transfer control (i.e. SEL-451 relay).
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SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
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BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
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The Return Transfer Sequence back to the Normal Condition can be an 3.5.3 Overview on Reset Over-Current Lockout
Open-Transition Return (non-paralleling of the source switches) or a The sequence to reset the over-current lockout is as follows:
Closed-Transition Return (paralleling ofthe source switches) as determined
1. Clear the problem that caused the over-current.
by the user. Furthermore the transfer back to the Normal Condition can
2. Place the SEL-451 in MANUAL and clear the LOCKOUT condition.
be selected as an Auto Retransfer or positioned in a Hold for Retransfer
3. Close the effected SOURCE switch.
mode as determined by the user. These user choices are shown in the Table
4. Place the SEL-451 in AUTO.
1 User Selectable Settings and are set in the Section 4.0 Initial Start-Up
Procedure when the MM Transfer Settings are programmed.
The detailed instruction to “Reset Over-Current Lockout” are provided
on page 20.
3.4 Overview on Transfer on Unbalanced Voltage
If any source-side fuses (energized at the same voltage as the metalenclosed switchgear) operate (blow) on either of the sources, creating a
single-phase” or “open-phase” condition to the load, the SEL-451 determines that the affected source is unavailable and transfers as described in
Section 3.2 Overview on Loss-of-Source Voltage. Once the affected source
returns and is confirmed as available by the SEL-451, a return transfer is
performed based on the MM Transfer Settings the user has selected for
the Return Transfer Delay timer, the Return Transfer Sequence (Open or
Closed Return Transfer), and the Auto Retransfer mode (Enable Auto Return or Hold for Retransfer), as described in Section 3.3 Return-of-Source
Voltage. The customer must select “Closed Return Transfer” settings very
appropriately to avoid causing any problems with a closed-transition
return that parallels the two sources.
3.5 Overview on Over-Current Conditions
In addition to the protection afforded by the conventional power fuses
or current-limiting fuses typically applied in feeder bays, there are three
over-current conditions that result in responses initiated by relays in the
switchgear. Two of these internal response modes are generated by the
SEL-451 relay (as part of the automatic-transfer scheme) when an overcurrent condition is sensed by the CTs on the cables or bus connected
to the incoming-source switches, namely, the Suspend Mode and the
Lockout Mode. The third internal response is generated by the CurrentUnbalance Relay when a current-unbalance condition is sensed by CTs
on a load-feeder circuit.
3.5.1 Overview on Suspend Mode (OC Detected )
A passing transient over-current condition such as a motor starting or
a load side protective device clearing initiates a “Suspend Mode”. Once
an over-current is detected, OC Lockout Timer begins and the system
goes into the suspend mode. Once the OC Lockout Timer times out,
the system checks to see if voltage is present. If voltage is present and
the over-current condition is gone, the system returns to normal. If the
over-current condition is still present, the system stays in suspend mode
and repeats the timing cycle.
3.5.2 Overview on Lockout Mode (OC Lockout)
A fault on the load side of the sensing CTs, which are positioned on the
incoming cables or bus, that has been cleared by a source-side protective
device will place the unit in the Lockout Mode. Once an over-current is
detected by the sensing CTs, the system goes into the Suspend Mode (see
previous paragraph). Once the OC Lockout Timer (see Table 1 on Page 4
and “MM Transfer Setting” in Appendix A) times out, the system checks
to see if voltage is present. If voltage is not present, meaning the fault has
been cleared, the source switch opens and the tie switch remains open
and they remain locked out.
3.5.4 Overview on Feeder Current Unbalance
A fault on the load side of the CTs in feeder bays will generate an overcurrent condition. The over-current is cleared by one or more of the
feeder fuses, depending on the number of phases involved. If one or two
phases are involved and the associated fuses operate (blow), the resulting single-phase condition has potential to cause damage to connected
three-phase rotating loads such as motors. Consequently, motor-operated
feeder switches in combination with a current-unbalance relay may be
employed to isolate three-phase loads when a fuse operation results in
a current unbalance. A fault resulting in the operation of all three fuses
in a feeder bay will result in a zero current-unbalance condition and the
relay will not initiate a switching operation.
4.0 INITIAL START-UP PROCEDURE
The following Initial Start-Up Procedures are to be performed once the
switchgear is energized whether by a temporary power source or by
the permanent three-phase utility power sources. It is important that
these Initial Setup Procedures be followed in the sequence presented so
that correct functioning of the Automatic-Transfer Scheme is achieved.
Failure to follow the sequence established below may result in equipment
malfunction or damage to components requiring a Field Service visit to
correct, which will be at the user’s expense when the sequence is not
followed. Before proceeding make certain to review Section 1.0 Overview
of System Operation to be generally familiar with the automatic-transfer
scheme that is programmed into the SEL-451 and the capabilities of
switches, relays and motor operators.
4.1 Preliminary Considerations
The listing below is not intended to be an all encompassing start-up
checklist of preliminary functions to perform. Proper installation is the
responsibility of the operating and construction personnel assigned by
the end user to that specific task. It is the responsibility of those personnel to develop the specific procedures and checklist that are to apply.
1. Review the equipment drawings to become familiar with the nomenclature and symbols used, the switchgear layout, component
identification, the wire labeling and identification technique, and
the physical construction of the switchgear assembly.
2. Make certain all shipping supports and braces are removed.
3. Make certain all bay-to-bay bus connections are complete and
bolts are tightened to the correct torque values.
4. Inspect the bus, bus supports and switch and fuse-mounting
insulators to make certain no damage has occurred.
5. Make certain all bay-to-bay wiring connections are completed and
any loose wiring is reconnected (or repaired) if necessary.
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INSTRUCTIONS FOR OPERATION
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BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 15
6. Make certain all component wiring is complete and any loose wiring
is reconnected (or repaired) if necessary.
5
4
3
2
1
7. Read, understand and comply with all tags, labels and hazardalerting signs on the outside and inside of the switchgear assembly,
the individual bays, doors, panels and compartments.
8. Make certain all low-voltage fuses are correctly installed.
9. Verify all fuses on voltage transformers are correctly installed.
10. Correctly assemble and install power fuses in accordance with the
fuse manufacturer’s instructions provided with the fuse holders
and fuse refill units; end fittings and fuse units; or current-limiting Figure 10. Faceplate of Falcon (brand) SSG series Uninterruptible Power
Supply.
fuses as applicable.
11. Remove shorting screws from the shorting-type terminal blocks
in the secondary connections of all current transformers.
1. Input Circuit Breaker – This switch controls the connection of utility
power to the UPS and its internal battery charger.
12. Install and connect cables and terminators in accordance with
the instructions provided by the manufacturers of those items.
2. LCD Display – Provides visual display of all the indicators and icons
for the UPS for easy identification of alarms and other conditions that
exist. The meaning and corrective actions required for these indicators and icons is included in the UPS instruction manual furnished
with the switchgear assembly and also see Appendix D.
13. Make certain that all connections are properly made to the UPS.
The UPS is generally shipped with certain cables disconnected to
prevent discharge of the battery during shipment and while power
may not be connected. All disconnected cables are labeled as such
and must be re-connected. Refer to Storage Requirements on page
3.
14. Set-up Current-Unbalance Relay. Refer to Section 5.4
4.2 Power on the UPS
It is particularly important that the UPS be brought online correctly,
otherwise incorrect operations may result.
Review the instruction manual for the UPS, which is included in the
packet of O&M documents provided with the switchgear, to make certain that the UPS is properly connected and turned on. Make certain
to be familiar with any alarm conditions that are associated with the
UPS as indicated in the UPS instruction manual.
4.2.1 Falcon Brand UPS
NOTICE
If control power is not available and the unit is furnished with a UPS
(Uninterruptible Power Supply), it must be powered on before any
control operations can occur.
The UPS furnished with the switchgear assembly may vary from unit
to unit. Therefore, refer to the specific instruction manual on the UPS
unit furnished with the particular switchgear.
The following information pertains only to the Falcon (brand) SSG series
UPS. The Falcon brand UPS has specific procedures and sequencing
for (i) Turning it on with utility power; (ii) DC startup without utility
power; and (iii) Turning it off. Make certain to refer to the Falcon UPS
instruction manual to establish the correct procedures to follow for
these functions. The Falcon brand UPS includes front panel features
as follow:
How To Display The UPS Parameters: Repeat pressing of the Set/
Alarm button will cause UPS input and output parameters to be
displayed on the lower portion of the LCD display in the following
order – Input Voltage, Output Voltage, Output Frequency, Battery
Voltage, Percentage of Output Load, Input Current, Internal UPS
Temperature, and the Output Current.
3. Function/Test Button – This button has two functions:
(a) Initiates internal UPS Setup mode to allow for configuration
changes. Setup mode is initiated by pressing both the “Function/Test” and “Set/Alarm” buttons simultaneously and holding
them for one second.
(b) A Manual Battery Test is performed when the “Function/Test”
button is held depressed for less than three seconds.
Manual Battery Test Description – When the UPS is operating
normally from utility power, pressing the test button will cause
the UPS to test the voltage status of the batteries for 10 seconds.
During that test period the battery, if first determined to be
good, will supply power to the UPS. Should defective batteries
be detected, the audible alarm will sound one long tone, and the
UPS will continue to operate from the utility voltage, without
going to battery mode. During the battery test, the output of
the UPS will not be adversely affected.
4. Set/Alarm Silence Button – This button has three functions:
(a) Disables the audible alarm buzzer – Pressing the button for one
second will turn off the audible alarm. This will cause future
notification of minor alarms to be silenced.
NOTE: The following alarms cannot be silenced: Over Temperature,
PFC Overcurrent, Inverter Output Overload, Low Battery, and UPS
or Charger Failure
(b) Scrolls the display through the various UPS parameters
(c) Sets configuration changes (when pressed in setup mode only)
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SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
AUTOMATIC SOURCE TRANSFER WITH SEL-451
BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 16
5. Bypass/Off Button – When the UPS is operating from the utility power
in the normal on-line state, depressing this button will cause the UPS to
transferto bypass. Depressing the bypass button again will return the UPS
to the normal on-line condition. When in bypass, the UPS will transfer the
connected load directly to the incoming utility power. When in Bypass
mode, the Battery Mode will not be available. The utility power will
continue to be passively filtered. The UPS will sound an audible alarm
and switch to Bypass Mode automatically on the following conditions:
OverTemperature, Overload, and Fault in the Battery or UPS electronics.
4.2.2 Energizing Incoming Components
Once all preliminary considerations have been addressed and the
authority with decision concurs that the switchgear is ready to be
energized, as an initial start condition, it is recommended that all
switches in the switchgear assembly be open so that only the source
switches and any bus or metering transformer components between
the point of cable connection and the open incoming-source switches
are initially connected to the power source. A reminder label, “INITIAL
START-UP” covering this sequence is also placed on the enclosure
adjacent to the door of the low-voltage compartment of the SEL451. See Label 3.
With power connected to the incoming source switches, the user’s
control-power and sensing voltage transformers will also be energized
because they are on the line side of the incoming source switch. As a
result, control power will be brought to all low-voltage components
that receive power from the secondary circuits of the voltage transformers or are connected to any source-side current transformers
4.3 Installing SEL-451 Relay Settings
INITIAL START-UP
1. Switch to the “MANUAL” position of the SS1 selector
switch.
2. Open all three of the transfer switches: Source 1,
Source 2, and Tie.
3. Close, at least, one source switch with a SEL-451
“CLOSE” pushbutton.
4. Switch to the “AUTO” position of the SS1 selector
switch.
If the “REMOTE OR SCADA ENABLE” light is off, then the
SEL-451 relay, or the pendants, will operate the Source and
Tie Switches.
If the ‘REMOTE OR SCADA ENABLE” light is on, then only
REMOTE inputs will operate the Source and Tie switches.
The “REMOTE ENABLE” can be selected, or de-selected,
with the pushbutton next to the light.
Label 3. Above label (“INITIAL START-UP”) is positioned on the enclosure
adjacent to the door of the low-voltage compartment to the SEL-451 and
provides specific guidance on how the INITIAL START-UP must be performed
for the SEL-451 to be initialized so that an “AUTO” (automatic transfer)
operation will be performed based on the operating parameters that have
been installed in the SEL-451 relay. If both sources are to be used, closing both
sources switches (tie switch remains open) will position the SEL-451 in the
Normal Condition.
Installation of the field-selectable SEL-451 relay settings requires a
laptop computer with AcSELerator QUICKSET® software installed. The
computer and software are required in order to view, download, install,
and edit the field-selectable settings as well as other key functions,
such as the Sequential Events Recorder (SER). The program must be
loaded first. The program is provided on a USB jump-drive shipped
with each unit of Federal Pacific Automatic-Transfer Metal-Enclosed
Switchgear and it is located inside the low-voltage compartment that
includes the SEL-451 relay, which is mounted on one of the switchgear
enclosure-bay doors.
The software is also available for download (with the computer on
and the web browser open and connected) at the following website:
http://www.selinc.com/SEL-5030/
The user must register online before downloading can begin. Downloading takes approximately 45 minutes. Once the Quickset software
is downloaded and installed, start the software to verify that it has
downloaded properly.
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SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
AUTOMATIC SOURCE TRANSFER WITH SEL-451
BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 17
4.3.1 Using AcSELerator Quickset®
When the software has finished loading, which takes approximately 45 minutes, select “Open” from the menu list under
“Settings”. Once this screen is open, browse to the folder containing the settings database for the SEL-451 and select “Open”.
Next, highlight “SEL451 S1 and S2 Template” in the new window
“Select Settings to Open” and select “OK”. The settings template
will open and allow the settings to be entered.
Figure 12. Select (highlight) the desired settings to open and click “OK”.
4.3.2 Entering Transfer Settings
Upon opening the settings template there will be one tab
labeled MM Transfer Settings. If any other tabs appear, such
as “Generator Testing”, they only apply to particular software
versions and are to be ignored.
Figure 11. Select “Open” from under the “Settings” menu group.
Figure 13. Select the “MM Transfer Settings”.
*NOTE: AcSELerator Quickset® is a registered trademark of SEL (Schweitzer Engineering Laboratories).
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SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
AUTOMATIC SOURCE TRANSFER WITH SEL-451
BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 18
On the MM Transfer Settings tab (“MM” refers to the split-bus configuration with two main incoming power sources that are accommodated
and separated by a tie switch. The user selectable settings are shown
in Table 1 and are fully described in Appendix A. Make desired settings,
based on specifications developed by the engineer of record having
authority, in the appropriate column.
4.3.3 Installing Transfer Settings
Select “Serial” for the “Active Connection Type” and navigate to the Serial
tab. Select the COM port that the serial cable is attached to. The correct
COM port to select will be of the form “COM16:SEC CP210x USB to UART
Bridge”. But, the COM port number will be different. Alternately, “Auto
detect” can be selected as a way to identify the Communications Parameters. The following default Communication Parameters must be verified
and selected on the screen.
Data Speed
9600
To load the settings into the SEL-451, the laptop computer must be conData Bits
8
nected to the front serial port through an approved null modem cable.
Stop Bits
1
A null modem cable is available from SEL or an approved alternate may
Parity None
be purchased. (A cable and the driver CD, if ordered, are shipped inside
RTS/CTS
Off
the low-voltage compartment that includes the SEL-451 relay.) First,
DTR
On
install the driver CD for the null modem cable into the computer. Then
RTS
On
connect the laptop computer to the front serial port (see Figure 2 and
Figure 18 on Pages 5 and 19, respectively). Next, adjust the communication parameters via the “Parameters” option in the “Communications” drop After these parameters have been verified, select “OK” and the computer
will connect to the SEL-451. The saved settings can now be loaded into
down menu. See Figure 14.
the relay by selecting “File” then “Send” from the drop down menu. Once
“Send” is selected the following message will appear:
Figure 16. After verifying the parameters, select “OK” and the computer should
connect to the SEL-451.
Select “OK” and the following message will appear:
Figure 14. Select the “Parameters” option in the “Communications” drop-down
menu to adjust the communication parameters.
Figure 17. To send the settings select “OK” when the appropriate message
appears.
Select “OK” and the settings will begin to send. Once the settings have finished
sending, disconnect the null-modem cable from the relay and verify that
the “Enabled” LED (at the top center of the SEL-451 faceplate - see callout
number “7” on Figures 2, 18 and 23) is illuminated. Sending settings will take
approximately 10 minutes.
If the settings do not send, review the error message and take actions accordingly. Verify that the COM Parameters are correct. If there remains a problem,
contact the factory.
5.0 OPERATION DESCRIPTION
This section details operations and controls performed automatically
by programmed conditions and parameters in the SEL-451 or locally
at the SEL-451 when it is in the “MANUAL” mode. In addition, this
section details operations using the Type ME Motor Operators and
its Decoupler. Lastly, this section details Feeder Bay Relay Operations,
covering the settings and operation of the Current-Unbalance Relay.
Figure 15. Select “Serial” tab for the “Active Connection Type” and the
applicable “COM” port and verify the parameters. If connection problems occur,
select “Auto detect” and proceed.
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SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
AUTOMATIC SOURCE TRANSFER WITH SEL-451
BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 19
5.1
Utility – Utility Operation
(Split-Bus Primary-Selective Scheme)
This section details all the automatic operations and controls that
will be performed by the SEL-451. These functions will be sequenced
based on the programmed conditions and the parameters installed
by the user as the transfer settings in the SEL-451 relay during the
procedures of Section 4.3.
5.1.1 Normal Operation
In a two-utility source split-bus automatic-transfer system with both
utility sources available, the normal condition has the SEL-451 relay
in the “AUTO” (automatic) mode, the Source 1 switch closed and the
Source 2 switch closed with the bus-tie switch open.
(b) If “AUTO RETRANSFER” is set to “N” (NO), the control relay will
wait until the “RESET HOLD RETURN” soft-key button is pressed
and held for three (3) seconds before the control relay will initiate
a transfer back to Source 1 and will return to the normal condition.
The return to Source 1 will be immediately after the (3) seconds
has elapsed without any further time delay and will be either
closed or open transition based on the user defined “RETURN
TRANSFER SEQUENCE” setting programmed into the control
relay. If the “AUTO RETRANSFER” is set to the “N” and the Source
2 Voltage is lost while serving the load and the Source 1 Voltage
is verified as healthy, the microprocessor control will override the
“AUTO RETRANSFER N” selection and initiate an open-transition
“RETRANSFER SEQUENCE” to Source 1.
5.1.4 Transfer on Unbalanced Voltage
5.1.2 Loss of Source Voltage
Loss of the voltage on Source 1 will cause the user defined “SOURCE 1
INITIAL TRANSFER DELAY” timer to begin timing. If the Source 1 Voltage returns before the timer finishes, the system returns to normal.
If the timer finishes (i.e. times out) and the Source 1 Voltage is not
available (i.e. has been lost) or is reduced below the ‘DEAD SOURCE
VOLTAGE”, the unit will transfer to Source 2 in the following sequence:
First, the Source 1 Switch will open and then the Bus-Tie Switch will
close, re-energizing the load circuit(s) normally served by Source 1.
5.1.3 Return-of-Source Voltage
If a single-phase or open-phase condition, such as due to the operation
of a source-side fuse or downed single-phase conductor) and occurring upstream at the same voltage level as the metal-enclosed switchgear, the SEL-451 determines that the affected source is unavailable
using 3V0 (zero-sequence voltage), and transfers to the unaffected
source. The source is considered unavailable when the 3V0 voltage
exceeds the user defined “VOLTAGE UNBALANCE” setting. Then, the
SEL-451 transfers to the unaffected source. Once the voltage source
returns to the “LIVE SOURCE VOLTAGE” setting the unit will transfer
back to the normal condition.
If the system is operating on Source 2 and the Source 1 Voltage becomes
healthy (i.e. reaches the “LIVE SOURCE VOLTAGE” — a voltage level Key to Figure 18 Features:
considered acceptable; refer to Table 1 or Appendix A), the “SOURCE 1
1. Front Serial Port
RETURN TRANSFER DELAY” timer begins. Once the source-return timer
2. LCD Screen
is finished (i.e. times out) and the SEL-451 determines that the Source 1
3. ESC – Escape Key
Voltage remains healthy and available, the user has two options depend4. Enter Key
ing on the “AUTO RETRANSFER” setting.
5. Navigation Soft Keys for LCD Screen
6. Trip LED Indicating Lamp
(a) If “AUTO RETRANSFER” is set to “Y” (Yes), the control relay will
7. Enabled LED Indicating Lamp
initiate a retransfer back to Source 1 and will return to the normal
8. Status Indicating Lamp
condition. The return to Source 1 will be either closed or open
9. Status-Indicating-Lamp Functional Description
transition based on the user defined “RETURN TRANSFER SE10. Target Reset Soft Key
QUENCE” setting that has been programmed into the control
11. Actuation Soft Key to Change Status Condition (typical)
relay. The setting choices are “Open” for Open-Transition Return
12. LED Indicating Lamp for Status Condition (typical)
or “Closed” for Closed-Transition Return.
13. Status Condition Label (typical)
1
2
5
3
6
7
8 9 10 11
12 13
4
Figure 18. Illustration of the of the SEL-451 faceplate. Description and function of these faceplate features are explained on page 5 and in Sections 5 and 6.
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SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
AUTOMATIC SOURCE TRANSFER WITH SEL-451
BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
PAGE 20
5.1.5 Source-Side Overcurrent Conditions
5.2 Local Operation
For local operations to be initiated, first the SEL-451 must be placed in
“MANUAL” mode by turning the Auto/Manual Selector Switch (SS1) on
the hinged panel below the relay to “MANUAL”. When this is done the
“MANUAL” LED on the relay faceplate will illuminate. To operate the relay
from the front panel, it must be in MANUAL mode and the “REMOTE ENABLE” LED lamp must be off, indicating that the control is in the manual
a. Suspend Mode (OC Detected ) — Suspends all Manual/Au- mode and all remote operations are blocked. If the “REMOTE-ENABLE”
tomatic Mode Operations
LED is illuminated, press the “REMOTE-ENABLE” push button to place
A passing transient such as a motor starting or a load-side the SEL-451 in local mode and the “REMOTE-ENABLE” LED will go off.
protective device operating would be detected as an over- Once the control is in “MANUAL” mode and “REMOTE” is disabled (i.e.
current condition. Once an over-current is detected, the “REMOTE-ENABLE” LED is off) the source switches and bus-tie switch
“Over-Current Lockout Timer” begins and the system goes can be operated from the front panel on the SEL-451.
into the suspend mode and waits to determine if an upstream protective device clears the fault. If the over-current 5.2.1 Open/Close Source and Tie Switches
condition ceases and voltage has not been lost, the Suspend The illuminated LED adjacent to the “SOURCE 1 OPEN” and “SOURCE 1
Mode will be automatically reset (turned off).
CLOSE”, the “SOURCE 2 OPEN” and “SOURCE 2 CLOSE”, the “TIE OPEN”
and “TIE CLOSE” pushbuttons indicates the open or closed status of the
b. Lockout Mode (OC Lockout) — Locks Out all Operations applicable Source and Bus-Tie switches. Control of the opening and closing
Until the Relay is Reset
of each switch is performed by pressing the respective Source 1, Source 2,
A fault, whether on Source 1 or Source 2, that has been or Tie open or close pushbutton. The relay must be placed in “MANUAL”
cleared by a source-side protective device (i.e. an over- mode for the open and close push buttons to be functional.
current sensed by CTs on the incoming cables (or bus)
followed by a loss-of-source voltage) will place the unit 5.2.2 Hold Return
in the “Lockout Mode”. Once an over-current is detected, If the “AUTOMATIC RETRANSFER” setting is set equal to “N (NO)”,
the system goes into the “Suspend Mode” as above. If the i.e. hold return, the SEL-451 will not retransfer back to the normal
system is in the “Suspend Mode” and the source voltage is condition until the “RESET HOLD RETURN” push button is held
not present after the Over-Current Lockout Timer has timed
down for 3 seconds. If the SEL-451 is waiting in the hold return
out, then the relay control goes into the “Lockout Mode”
and (with no voltage present) the incoming switch on the state, the “RESET HOLD RETURN” LED will be flashing red. If the
affected source will be opened and it and the bus-tie switch “AUTO RETRANSFER” is set to “N” and the source serving the load
will be locked out once the Over-Current Lockout Timer has is lost while serving all the load and the Source Voltage of the
source that is not serving load is verified as healthy, the SEL-451
finished.
Within the automatic-transfer scheme there are two internal modes
associated with source-side overcurrent conditions, namely, the “Suspend Mode” and the “Lockout Mode”. And, after a “Lockout Mode” has
occurred, the SEL-451 relay must be reset. The two modes and the
reset procedure are described in the paragraphs that follow.
relay will override the “AUTO RETRANSFER N” selection and initi-
If voltage returns before the timer has finished (a successful ate an open-transition RETRANSFER to the healthy source that is
reclose operation upstream of switchgear) the control aunot serving load.
tomatically resets the suspend mode and the closed source
switch on the affected source remains closed and the open
bus-tie switch remains open. Thus, the Over-Current con12 LED 13 Label
dition is cleared and the system will remain in the normal
condition.
Soft
c.
Reset Over-Current Lockout
To reset the SEL-451 relay from an Over-Current Lockout
condition, proceed as described below.
(1) Clear the fault that caused the over-current and verify
that the condition causing the fault is no longer present.
(2) Place the control in Manual mode by turning the Auto/
Manual Selector Switch (SS1) to “MANUAL”. The “Auto/
Manual” Selector Switch is located on the hinged panel
below the SEL-451 relay.
(3) Press the “SOURCE 1 LOCKOUT” (or “SOURCE 2 LOCKOUT”) soft-key push button on the faceplate of the
micro-processor control relay, removing the LED illumination.
(4) Manually close the appropriate source switch(es) using
the “SOURCE 1 (or 2) CLOSE” soft key on the faceplate
of the relay. The closed condition is denoted when the
LED adjacent to the “SOURCE 1 (or 2) CLOSE” soft key
is illuminated amber.
(5) Return the unit to the automatic mode by turning the
“Auto/Manual Selector Switch” (SS1) to “AUTO” as labeled
on the hinged panel.
11
Key
Figure 19 . Illustration of the active soft-key
pushbuttons and the associated LED with the
label text that is applicable. See page 5 for full
description of each numbered feature.
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5.2.3 Lockout
An overcurrent lockout condition can be reset once the fault has been
cleared and corrected. A LOCKOUT condition is identified by illumination of the LED adjacent to the “SOURCE 1 (or 2) LOCKOUT” active
soft key pushbuttons. To reset the lockout condition, place the relay
in the “MANUAL” mode. Then, press the “SOURCE 1 (or SOURCE 2, as
applicatble) LOCKOUT” push button for 3 seconds to affect a reset
of the lockout condition. If the SEL-451 is in Lockout Mode then the
“SOURCE 1 or SOURCE 2 LOCKOUT” LED will be illuminated red. Follow the procedure at 5.1.5c “Reset Over-Current Lockout” on page 20
to restore the switchgear to the normal condition.
5.3.1 Type ME Motor Operator Features
5.3.2 Motorized Operation
In the event the SEL-451 is not available, the motor can be controlled independently from the motor operator by either of two methods. A LOCAL/
REMOTE toggle switch on the black plastic panel (mounted in the enclosure
stile near the right edge of the door - see Figure 20) determines which
position is active. “LOCAL” control disables any remote signals and allows
use of the momentary (centering) toggle switch “OPEN – OFF – CLOSE”
also located on the front panel to control motorized opening and closing of the switch. “REMOTE” disables the local toggle switch control and
requires a pair of dry contacts to make the circuit between the common
and open circuit or the common and close circuit to operate the motor.
5.3 Motor Operator Operation
These contacts are controlled through the SEL-451 or current-unbalance
Included in this section is detail coverage of the features of the mo- relay (as applicable), which initiates open/close signals to operate the motor.
tor operator, procedures to follow for local operation of the motor
operator at the switchgear to accomplish open/close operations and
the procedures to follow when coupling and decoupling of the motor operator. Each motor operator is furnished with a Local/Remote When actuating the motor operator of an incoming load-interrupter
switch. Each motor operator must be placed in the Remote mode switch or the tie switch (i.e. switches associated with the automaticfor the automatic-transfer control or the Current-Unbalance relay transfer scheme), if the Local/Remote selector switch on the motorto work properly. However, to avoid potential confusion, ALL manual operator control panel is moved to the “LOCAL” position, a particular
electrical operation of the Source and Tie Switches, such as opening reset procedure must be followed at the automatic-transfer control
and closing switches, is to be performed through the SEL-451 Relay.
(i.e. SEL-451 relay). A red reminder label “RESET AFTER LOCAL CONTROL” is placed adjacent to each applicable motor operator. The
reset instructions are stated on a red label “RESET PROCEDURE”
placed adjacent to the door over the automatic-transfer control
(i.e. SEL-451 relay).
NOTICE
1
3
2
7
8
4
5
6
9
13
10
12
11
Figure 20. Federal Pacific motor operator and key features are shown
above and identified below.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
Enclosure door handle
Padlock tab for door handle
Decoupling mechanism
Interlocked cover over Manual Operation Access Port
Switch-operator crank shaft (behind interlocked sliding cover)
Lift tab for interlocked cover — raise to access manual-operating shaft
and to stop a running motor when switch is decoupled
Padlockable decoupler lever bar
Decoupler position (coupled/decoupled) on slotted indicator plate
Toggle switch - closes/opens (center “OFF” position) a switch when
selector switch is in Local and motor operator is coupled
Local/remote selector switch
Operation counter (optional)
11-gauge steel enclosure, door and compartment cover
Padlockable hinged cover with pentahead bolt - for all low-voltage compartments (see series of photos at Figure 5).
In either case, local or remote, once started, the motor is sealed in and
cannot be stopped until it reaches and operates the limit switch at end of
travel. Limit switch activation causes the dynamic brake circuit to instantly
stop the motor.
If the decoupler is moved to the “DECOUPLED” position and the LOCAL/
REMOTE Selector Switch is turned to LOCAL and then the motor is started
by LOCAL signal, the motor will continue to run because the limit switch
will never be activated. To stop the motor, power must be removed or the
cover over the Handcrank Port (see Figures 9 and 20) must be lifted to
break the seal-in circuit. The motor will not start from “REMOTE” when in
the decoupled position.
5.3.3 Decoupler Operation
Complete details on the Type ME Motor Operator are included in Federal
Pacific Instruction Bulletin Section FPIB-FPOO-059A. Only basic operation
and features are covered in this publication.
The motor operator used to operate each load-break switch is capable of
being decoupled in order to test the system without creating an outage.
Decoupling the motor allows opening/closing the motor operator without opening/closing the load-break switch. It is very important to return
the motor to the same position (open or closed) as the switch in order to
recouple properly.
NOTICE
It is important to have the unit in the Manual Mode when coupling/
decoupling the motor in order to prevent injury to yourself or damage to the equipment.
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CAUTION
If switch is DECOUPLED and the motor is started by local operation
or from a hand-held controller, the motor will continue to run. TO
STOP THE MOTOR, LIFT THE INTERLOCK COVER that is over the
manual-crank shaft or remove power from the motor. Motor will
not otherwise stop as the limit switch is bypassed when the motor
is decoupled.
In the decoupled position, neither the motor nor the handcrank
can change the position of the switch. Coupling is accomplished by
pulling the decoupler lever to its outward position (see “Decoupled”
label on decoupler-position slotted plate). Pushing the coupler bar
to its inward position decouples the operator. The decoupler lever
bar can be padlocked in either the coupled or decoupled position.
Running the motor or handcranking while in “DECOUPLED” mode
will misalign the engagement of the front and rear shafts at the
decoupler. When the decoupler is to be recoupled, engagement will
not take place until the handcrank is inserted and turned to realign
the front shaft with the rear shaft. Alignment is achieved when the
decoupler moves sufficiently to allow the padlockable decoupler
lever bar to fall into the slotted indicator plate.
NOTICE
Be sure to return each switch and the associated motor operator to
the original matching states before coupling and returning the unit
to the Automatic Mode. If shaft does not re-couple, raise Interlock
Cover and place Handcrank on Switch-Operating Shaft and slowly
rotate Handcrank up to 45° in either direction until Decoupler Lever
Bar can be correctly positioned in the applicalble slot, indicating that
correct positioning has been achieved.
5.3.4 Handcranking
Handcranking is accomplished by lifting the cover over the ManualOperation Access Port (see Figure 21) to expose the handcrank shaft.
Lifting the cover operates two microswitches, one to interrupt power to
the controls that could start the motor and the other to break continuity
in the motor circuit itself to prevent dynamic braking of the motor during
handcranking. The crank can then be inserted, placed on the handcrank
shaft, and turned about eleven (11) revolutions to accomplish either a
“CLOSE” or “OPEN” operation.
CAUTION
After hand cranking, if the switch is subsequently DECOUPLED and
the motor is started by local operation or from a hand-held controller, the motor will continue to run. TO STOP THE MOTOR, LIFT THE
interlocked cover over the Manual-Operation Access Port or remove
power from the motor. Motor will not otherwise stop as the limit
switch is bypassed when the motor is decoupled.
NOTICE
If switch is decoupled, be sure to return each switch and the associated motor operator to the original matching states before coupling
and returning the unit to the Auto Mode. If shafts do not align to
re-couple, raise cover over Manual-Operation Access Port, place
Handcrank on Switch-Operating Shaft and slowly rotate Handcrank
up to 45° in either direction until Decoupler Lever Bar is correctly
pulled into position in the “Coupled” slot, indicating that coupling
has been achieved.
5.4 Feeder-Bay Relay Operation
Standard feeder bays typically include manually-operated Auto-jet®II
Load-Interrupter Switches in combination with either conventional
expulsion-type power fuses or current-limiting fuses. When these
components are provided, refer to Instruction Bulletin IB-3A-310LP
for information on operation of switches and handling, installing and
changing fuses.
Feeder bays may alternately include, as an option, shunt-trip Auto-jet®II
Load-Interrupter Switches in combination with power fuses. Shunt-trip
switches prevent single-phasing of the connected load circuit when
one fuse operates on a fault – such as would be desirable if motors
are part of the load. When feeder bays include optional shunt-trip
Auto-jet®II Load-Interrupter Switches, also refer to Instruction Bulletin IB-3A-310LP for information on operation of shunt-trip switches.
A
B
Figure 21. For hand cranking, raise the cover over the Manual-Operation Access
Port (photo A) to expose the manual-operating shaft. Raising the port activates an
interlock to prevent all electrical operations while the cover is raised. Place the hand
crank on the operating shaft (photo B) crank in the desired direction to open/close
the associated switch. If the switch is decoupled and the motor is operated, raising
the cover will stop the running motor.
Another option is for feeder-bay switches to be motor-operated so
that switching operations can be relay controlled by, for example, a
current-unbalance relay.
5.4.1 Operation of Current-Unbalance Relay
The current-unbalance relay includes a dial that allows selection of
the threshold level for the percent (from 2 to 25 percent) unbalance
level above which the relay recognizes that an unbalance condition
exists and responds. The relay also includes a dial that allows selection
of the threshold level for the time period the unbalance condition is
allowed to persist after which a switch-open operation is initiated.
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5.4.2 Install Settings on Current-Unbalance Relay
Actual relay settings to use require a coordination study that must
be performed and provided by the consulting engineer or other designated office. The relay must coordinate with both upstream and
downstream protective devices to insure that relay operation does
not jeopardize system equipment or the protection scheme. The
end user and its representative are the only ones that know all the
considerations that must be made when deciding the unbalance and
time delay settings to use.
1.
2.
3.
4.
Unbalanced Indicating Lamp – Illuminates when an unbalance
condition exceeding the pre-selected percent- unbalance level
occurs
Percent-Unbalance Dial – Turn dial to select the desired percent
current unbalance (adjustable from 2% to 25%) above which the
condition will initiate the start of the Time-Delay timer
Time-Delay Dial – Turn dial to select the desired time delay (adjustable from 2 seconds to 20 seconds) that will occur between
when a current-unbalance is detected and when the associated
motor-operated feeder switch is tripped open; time delay confirms
that the unbalance condition is considered permanent and not
temporary
Tripped Indicating Lamp – Illuminates after an unbalance condition exceeding the pre-selected percent- unbalance level has
occurred; the preset Time-Delay has expired; and the associated
Feeder Switch has opened
Current transformers (one on each phase - see Figure 8C) provide the
sensing input current to the relay. The current-unbalance relay includes
a sensing circuit that drives a DPDT relay, which remains energized when
a normal, balanced-current condition exists. An unbalanced-current
condition exceeding the pre-selected percent-unbalance current
threshold will cause the relay to drop out. A relay drop out starts the
timer which, if allowed to time out, provides the signal input to the
motor operator to initiate a switch-open operation.
zero current (loss of all three-phases) as balanced, in which case, the
relay stays energized and no switching occurs.
Select, record and install appropriate relay settings.
5.4.3 Reset Current-Unbalance Relay
The Current Unbalance Relay can be arranged to be reset in either of
two ways:
(a) The Current-Unbalance Relay will automatically reset upon restoration
of correct current balance, or
(b) A normally-closed momentary pushbutton contact can be connected
to permit a manual reset. If the pushbutton is installed, it will be
located on a hinged panel in the low-voltage compartment where
the Current-Unbalance Relay is mounted. See Figures 5C and 5D.
To restore the feeder circuit, to access the interior of the enclosure, to
change fuses, and to reset the Current-Unbalance relay from a TRIP
condition, follow the user’s established safety procedures, including
wearing appropriate personal protective equipment and using suitable
handling tools for working on and changing fuses at the voltage level
of the switchgear, and proceed as described below.
1.
2.
3.
4.
If a balanced condition returns before the Time-Delay Timer times out,
the relay automatically resets. The current-unbalance relay considers
5.
2
3
6.
7.
1
4
8.
9.
Figure 22. Current-Unbalance Relay is pictured above and key
features are identified and described in the numbered points
in the text above.
Clear the fault that caused the over-current and verify that the
condition causing the fault is no longer present.
Remove the cover that is over the Motor Operator on the faulted
feeder. Place the Motor-Operator in the “LOCAL” mode by turning
the “LOCAL/REMOTE” Selector Switch to “LOCAL”. The “LOCAL/
REMOTE” Selector Switch is on the black control panel that is
mounted on the switchgear-bay enclosure stile to the right side
of the door. See Figure 20.
Verify the position open or closed of the feeder switch by inspecting the switch-blade position through the viewing window in the
enclosure door.
Open the small door of the low-voltage compartment on the
applicable switchgear-bay door. Verify that the illuminated open
(green) or closed (red) indicating lamp matches the switch position
as viewed through the viewing window.
If the feeder switch is open (green “OPEN” indicating lamp is illuminated), proceed to Step 6. In the unlikely event the feeder
switch is closed (red “CLOSED” indicating lamp is illuminated),
open the feeder switch.
Use the procedures described in Section 5.3.3 Decoupler Operation to decouple the motor operator from the switch. Secure the
motor operator in the decoupled position by applying a padlock
to the decoupler lever tab.
Open the enclosure door until it is secured by the doorstop.
Open the screen door and, in accordance with the user’s standard
operating procedures and safety practices, test for voltage and
then install ground clamps - first to the compartment ground bar
and then to the ground studs on the fuse mountings. Replace the
blown fuse(s) in accordance with the fuse manufacturers instructions using applicable fuse handling tools. When finished, remove
the grounds in the reverse sequence.
Close and secure the screen and then the enclosure door. Remove
the padlock from the decoupler lever tab and couple the motor
operator and the switch. See the “NOTICE” in Section 5.3.4 Handcranking, which discusses coupling procedure.
In the low-voltage compartment of the Current-Unbalance Relay,
press the “RESET” pushbutton and verify that the adjacent lamp
labeled “TRIP” is no longer illuminated. Open the hinged panel and
verify that the LED labeled “TRIPPED” is no longer illuminated. If
both the “TRIP” lamp and the “TRIPPED” LED are not illuminated,
the Current-Unbalance Relay has been successfully reset.
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10. After taking all necessary precautions, gaining approval of the authority having jurisdiction and following user’s standard operating
practices and procedures, Close the feeder switch by one of the
following methods: (i) connect the appropriate hand-held controller to the receptacle on the enclosure of the applicable feeder bay;
move away from the switchgear and use the CLOSE toggle switch
to close the switch; (ii) use the OPEN/CLOSE toggle switch on the
black control panel and move it to “CLOSE” (toggle switch returns
to a center “OFF” position); or if control power is not available, (iii)
use the hand crank to close the switch. Verify the actual close position of the switchblade has been achieved by inspection through
the viewing window in the enclosure door and by verifying that the
red “CLOSED” lamp on the hinged panel is illuminated.
11
Disconnect the hand-held controller or remove the hand crank (as
applicable) and secure the cover of the low-voltage compartment.
12. Place the Motor-Operator on the feeder in the “REMOTE” mode by
turning the “LOCAL/REMOTE” Selector Switch to “REMOTE” and
re-install the cover.
6.0 Alarms, Indication and Test
When the SEL-451 relay is applied for automatic transfer between two
(2) utility sources each serving a section of bus with the two bus sections
separated by an open bus-tie switch, there are twenty-six (26) LED-type
indicating lamps that provide status or alarm, which are in addition to
the twelve LED lamps associated with the soft keys. Each LED lamp and
its function are described in this section in the sub-section paragraphs
that follow. The target LED indicating lamps are illustrated in Figure 23.
6.1 SEL-451 Alarms and Indicators
The SEL-451 has multiple target LED indicating lamps on the front panel.
Each source has three (3) voltage associated LEDs, one for each phase
(A, B, and C) and four (4) status alarms associated with each source, plus
twelve (12) other status LEDs related to system operation. These LEDs
provide indication and alarms as described in the sections that follow.
6.1.1 Status LED Indicating Lamps
S1 OC TRIP — Illuminates when an over-current lockout condition occurs on Source 1
S2 OC TRIP — Illuminates when an over-current lockout condition
occurs on Source 2
S1 VA, S1 VB, S1 VC — Illuminate solid GREEN when the voltage of the
referenced phase on Source 1 is healthy. If the voltage is not healthy
(DEAD) the LED illuminates solid RED. If a simulation of voltage loss is
being performed, then the LED will be flashing red and green to show
that a test is being performed.
S2 VA, S2 VB, S2 VC — Illuminate GREEN when the voltage of the
referenced phase on Source 2 is healthy. If the voltage is not healthy
(DEAD) the LED illuminates solid RED. If a simulation of voltage loss is
being performed, then the LED will be flashing red and green to show
that a test is being performed.
S1 UNBALANCE — Illuminates when an unbalance condition exists on S1
S2 UNBALANCE — Illuminates when an unbalance condition exists on S2
AUTO TX OK — Illuminates when all conditions exist for an Automatic
Transfer to be performed if voltage is lost on either source
AUTO — Illuminates when the SEL-451 is in the “AUTO” mode
MANUAL — Illuminates when the SEL-451 is in the “MANUAL” mode
NEW EVENT — Illuminates when a change of state has occurred resulting in a recordable event
6.1.2 OC Suspend LED Indicating Lamp
The “OC SUSPEND” LED flashes red when the SEL-451 is in Suspend
mode. Otherwise, the LED is not Illuminated.
6.1.3 Source Lockout LED Indicating Lamps
The “S1 OC TRIP” and “S2 OC TRIP” LED indicating lamps flash red when
a Lockout condition exists on the applicable source. Otherwise, the
LEDs are not illuminated.
9
10
7
6
8
OC SUSPEND — Illuminates when an over-current suspend condition
exists on either source
S1/S2/TIE PARALLELED — Illuminates when both source switches and
the tie switch are all closed
DOOR OPEN — Illuminates when the enclosure door of any bay section is open
S1 DECOUPLED — Illuminates when the motor operator on the Source
1 switch is decoupled
S2 DECOUPLED — Illuminates when the motor operator on the Source
2 switch is decoupled
TIE DECOUPLED — Illuminates when the motor operator on the BusTie switch is decoupled
PHASE A, PHASE B, PHASE C — Illuminate to identify the faulted phase
that created the over-current lockout condition
GROUND — Illuminates to identify that a fault to GROUND created the
over-current lockout condition
Figure 23. Illustration of the status
LEDs and the associated label text
that is applicable. See pages 5 and
19 for feature description of each
numbered callout.
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6.1.4 LCD Screen
The LCD screen (see Figure 24) will continuously and automatically
scroll through the primary display points (See Appendix C) at 5-second intervals. Manual scrolling through the individual primary display
points is performed by using the “up” and “down” arrow soft-key push
buttons adjacent to the LCD screen. Pressing one of these soft keys
stops the scrolling. Some individual primary display points screens
may have imbedded subordinate screens that are reached by use of
the “ENT” (ENTER) soft key to select the desired screen. In addition to
scrolling down or laterally with the arrow soft key, the “ESC” soft key
is available to scroll back through the previous screens of the primary
display points. The list of primary display point screens is typically as
described in Appendix C.
b. Main Menu Screens
The SEL-451 LCD display screen also displays a “MAIN MENU” screen
which includes a list of eleven (11) display points (see Appendix C Figures
C1 and C2). Many of these display points are non-functional in so far as
the Federal Pacific automatic-transfer control sequence is concerned.
In particular, the “ONE LINE DIAGRAM” entry is NOT an accurate rendering of the circuit diagram for the specific metal-enclosed switchgear furnished. Consequently, do not be confused by that diagram,
again, it does NOT pertain to the Federal Pacific automatic-transfer
metal-enclosed switchgear. On the other hand, there are three display
points that are of interest and these are described below.
(a) The “MAIN MENU” item “EVENTS” provides the facility to view
events that have occurred. Details of this capability are in the
SEL-451 instruction manual.
(b) The “MAIN MENU” item “SET SHOW” provides the facility to
edit the DATE/TIME. See Appendix C Figure C4.
5
2
(c) The “MAIN MENU” item “DISPLAY TEST” provides the facility to
verify that all LEDs remain functional. See Appendix C Figure
C5.
6.2 Event Reporting and Sequential Event Recorder (SER)
3
4
Figure 24. Illustration of the LCD screen, soft-key
navigation arrows for the LCD screen and the “ESC”
(escape) soft key and “Enter” soft key. See pages 5 and
19 for feature description and Appendix C.
a. Primary Display Points
The Primary Display Points shown on the LCD display are continuously scrolling and show the various values for each source and also displays several
alarms. The fundamental values and alarms displayed on the LCD screen are
as follows:
SOURCE 1 PHASE CURRENTS
SOURCE 1 PHASE VOLTAGES
SOURCE 2 PHASE CURRENTS
SOURCE 2 PHASE VOLTAGES
MOTOR 1 MISMATCH
Motor 1 Open/Close position does not
match Switch 1 Open/Close position.
MOTOR 2 MISMATCH
Motor 2 Open/Close position does not
match Switch 2 Open/Close position.
The Event Reports and Sequential Events Recorder features significantly aid post-fault analysis and help improve the development
and understanding of both simple and complex protective scheme
operations. These features also aid in testing and troubleshooting
bay settings and control schemes. Oscillograms are available in binary COMTRADE and ASCII COMTRADE formats. Details on these
features and establishing appropriate settings are found in the SEL451 Instruction Manual.
6.2.1 Oscillography and Event Reporting
In response to a user-selected internal or external trigger, the voltage, current, and element status information contained in each event
report confirms relay, scheme, and system performance for every
fault. Decide how much detail is necessary when an event report is
triggered by selecting from a choice of: 8 kHz, 4 kHz, 2 kHz, or 1 kHz
resolution for the analog data.
The relay stores from 24 seconds of data per fault at 1 kHz resolution to 3 seconds per fault at 8 kHz resolution. Reports are stored in
nonvolatile memory. Settings operational in the relay at the time of
the event are appended to each event report.
6.2.2 Event Summary
Each time the SEL-451-5 generates a standard event report, it also
generates a corresponding Event Summary. This is a concise description of an event that includes bay/terminal identification, event date
and time, fault location, phase voltages, fault type at time of trip, and
trip and close times of day. With an appropriate setting selected by
the user, the relay will automatically send an Event Summary in ASCII
text to one or more serial ports each time an event report is triggered.
UPS BATTERY ABNORMAL UPS has an abnormal battery voltage
level.
UPS AC POWER LOSS
UPS has lost AC Power.
OC PHASE 1,2,3
Displays the faulted phase that created
the over current lockout condition.
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6.2.3 Sequential Events Recorder (SER)
Use this feature to gain a broad perspective of relay element
operation. Items that trigger an SER entry are selectable and can
include input/output change of state, element pickup/dropout,
recloser state changes, etc. The relay SER stores the latest 1,000
entries.
6.2.4 Access to Event Information
Access to the Event Reports and Sequential Events Recorder features is achieved by first connecting a laptop computer to the RS
232 port on the faceplate of the SEL-451 relay. Then, the data can
be viewed and downloaded by opening the AcSELerator Quickset®
software and moving through the series of tabs shown in Figure
B1 in Appendix B. The detail on all of the data that is available
and, for example, how to create oscillography as well as all other
aspects (such as troubleshooting) and capabilities are covered
in the SEL-451-5 Instruction Manual – a copy of which is on the
thumb drive that is provided with the switchgear assembly. The
SEL-451-5 Instruction Manual is also found on the SEL website
at www.selinc.com .
A
1
6.3 Other Component Alarms & Capabilities
The Federal Pacific automatic-transfer scheme includes a few
auxiliary components and capabilities that enhance the overall
operational flexibility of the system. The auxiliary components
and capabilities include a UPS (uninterruptable power supply), test
function capabilities, door-open interlock switches (see Figures
8C and 8D), convenience electrical duplex receptacle (see Figure
5B) and receptacles for attaching cord from hand-held controller
(see Figures 6 and 25), allowing test functions to be performed
from an adjacent location.
6.3.1 Uninterruptible Power Supply
The UPS provides adequate battery backup for the SEL-451 relay
when control power has been lost regardless of cause. The UPS
insures that the relay is always capable of performing its intended
function whether or not the normal control-power source, the
voltage transformers, is available. The UPS also includes a battery
charger and associated alarm circuits (a) in the event ac Input to
the battery charger is diminished or lost and (b) output from the
battery is diminished below acceptable levels or lost. Refer to
Apendix D and the UPS Instruction Manual furnished with the
switchgear.
6.3.2 Test Functions
The test function allows single-phase outage or multi-phase
outage testing of the automatic-transfer scheme. In addition,
the functionality of each motor-operated switch can be verified.
To fully test the automatic-transfer capability, the tests need to
be performed by actually opening/closing the source and tie
switches. This means, however, that power to the load circuits
will be lost during the test intervals. The length of time for the
outage will vary depending on the transfer settings for the Initial
Transfer Delay, Return Transfer Delay, Auto Retransfer, Alt_Unhealthy_Bypass_Hold_Timer, and the Return Transfer Sequence.
If power to the load circuits cannot be lost during testing, a
partial test of the automatic-transfer scheme that will (i) confirm
functionality of the SEL-451 relay and (ii) confirm an appropriate
responding functional test of the motors can be performed with
the motor operators decoupled from the switch. However, when
performing a test with the motor operators decoupled, remember
that it will be necessary to stop each motor from running by raising the cover over the Manual-Operation Access Port.
B
Figure 25. The Federal Pacific automatic-transfer scheme includes: a UPS
(view A at top in photo); a Normal/Test selector switch (at bottom left in
bottom photo) that allows using a hand-held controller (plugged into the
receptacle below the selector switch) to permit losing voltage on each phase
of both sources to verify the automatic-transfer capability of the unit from
a location distant from the switchgear; an Auto/Manual Selector Switch – in
Auto, system will respond to input received from programmed conditions and
sequences in the SEL-451 relay, in Manual, system will respond to manual/local
operations initiated at the unit; a set of Open/Closed (Green/Red) switchposition indicating lamps, representing the position of the Tie Switch; Status
(Green) indicating lamp to indicate correct conditions exist for automatic
transfer to be performed in accordance with the programmed conditions
and sequences in the SEL-451; and (below the selector switch and indicating
lamps), Test Jacks for Source 1 and for Source 2.
Tests to confirm the functionality of the automatic-source transfer
scheme can be performed as is recommended and described in
paragraph (a) that follows by using an optional hand-held controller,
that is connected to the secondary outputs of the line-side voltage
transformers through a test receptacle, which is mounted on the
hinged panel below the SEL-451 relay or, if the hand-held controller is
not purchased, as described in paragraph (b) that follows by opening/
closing low-voltage circuit breakers that are similarly connected to the
secondary outputs of the line-side voltage transformers, which are on
the incoming side of the Source 1 and Source 2 switches.
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Tests to confirm functionality of each motor operator independently
can be performed as is recommended and described in paragraph (c)
that follows by using an optional hand-held controller, which is connected in parallel to the open/close toggle switch of the associated
motor operator through a test receptacle, which is mounted on the
enclosure above each motor operator or, if the optional hand-held
controller is not purchased, as described in paragraph (d) that follows
by using the individual motor-operator open/close toggle switch that
is mounted on the black faceplate of each associated motor operator.
NOTICE
The conditions in the “NOTICE” boxes on pages 21 and 22 apply when
performing Motorized Operations, Handcranking and Decoupler
operations described in paragraphs (a) through (d) of Section 6.3.2
“Test Functions” that follow . When performing these functions on
the Source 1, Source 2 or Tie switches, the additional precautions set
forth in the “NOTICE” boxes of Section 2.3.2 “Overview on Manaual
Electrical Operation” on pages 12 and 13 also apply.
CAUTION
The conditions in the “CAUTION” boxes on page 22 apply when
performing Motorized Operations, Handcranking and Decoupler
operations described in paragraphs (a) through (d) of Section 6.3.2
“Test Functions” that follow .
(a) Test Automatic-Transfer On Loss-of-Source Voltage Using
Optional Hand-Held Controller
The optional Hand-Held Controller for this application is identified
by having six (6) toggle switches.
vii. After testing is complete and the equipment has restored
to the normal condition:
• Disconnect the pendant connector from the “TEST RECEPTACLE”
• Replace the cap on the “TEST RECEPTACLE”Return the
NORMAL/TEST Selector Switch (SS2) to the “NORMAL”
position
(b) Test Automatic-Transfer on Loss-of-Source Voltage Using LowVoltage Circuit Breakers
The low-voltage circuit-breakers are those mounted lowest and
in a row on the rear panel of the low-voltage compartment that
is located behind the hinged panel on which the SEL-451 relay is
mounted. These circuit breakers protect the low-voltage circuits
that are connected to the secondary outputs of the line-side voltage transformers, which are on the incoming side of the Source 1
and Source 2 switches. Use of these low-voltage circuit breakers
to perform test simulations of Loss-of-Source Voltage to verify
functionality of the automatic-transfer scheme requires:
i. inspection of the electrical drawings (and any modifications
the user may have made subsequently) to determine the
particular circuits that will be dropped when each circuit
breaker is opened;
ii. the wearing of proper personal protective equipment for
the work being done that involves exposure to energized
circuits;
iii. the following of user’s established standard operating procedures and practices; and
(iv) with all functions performed by a “qualified person” as described on page 1 of this instruction bulletin having knowledge of the specific hazard’s involved when performing
these duties.
To Simulate Loss-of-Source Voltage:
These connections apply only to Motor Operators on incoming
Test the functionality of the Automatic-Transfer scheme on Loss-ofSource Switches.
Source Voltage by first observing the precautions noted above and
i. Turn the NORMAL/TEST Selector Switch (SS2) to the “TEST” position then opening one of the individual low-voltage circuit breakers (CB-1,
ii. Remove the cap from the “TEST RECEPTACLE” on the CB-2 and CB-3 for Source 1, Phases 1, 2 & 3, respectively, or CB-4, CB-5
hinged-panel
and CB-6 for Source 2, Phases 1, 2 and 3, respectively) to first lose
iii. Secure the pendant connector on the Hand-Held Control- voltage to initiate the automatic transfer and then close the opened
ler to the “TEST RECEPTACLE” and relocate to a position low-voltage circuit breaker to return voltage on that phase and allow
distant from the switchgear
the return transfer to occur.
iv. Move the toggle switch on the Hand-Held Controller to
initiate a loss-of-source voltage on one phase of SOURCE If the motor operators are coupled to the switches, power to the
load circuits will be lost during the test intervals. The length of time
1 (or Source 2)
v. Moving the toggle switch starts the “INITIAL TRANSFER for the outage will vary depending on the transfer settings for the
DELAY” timer. The transfer will start after the “Source 1 (or Initial Transfer Delay, Return Transfer Delay, Auto Retransfer, Alt_Unhealthy_Bypass_Hold_Timer, and the Return Transfer Sequence. If
2) Initial Transfer Delay” timer setting has expired.
vi. Move the toggle switch back to restore the healthy source motor operators are decoupled, refer to the immediately preceding
condition and the system will retransfer to the normal con- “NOTICE”.
dition consistent with the settings in the SEL-451. If “AUTO
RETRANSFER” is enabled (i.e. “Y” setting) the retransfer will
(c) Test Open/Close Operations Using Optional Hand-Held Controller
take place after the “SOURCE 1 (or 2) RETURN TRANSFER
DELAY” timer has expired. If “AUTO RETRANSFER” is disabled
• To Open/Close a Motor-Operated Switch:
(i.e. “N” setting for “HOLD RETRANSFER”) the retransfer will
This procedure applies when an Open/Close operation of a
not take place, but can be initiated by pressing the active
Motor-Operated Switch is to be initiated using the Hand-Held
soft key labeled “BYPASS RETRANSF TIME DELAY’ on the
Controller from a location within 50 feet of the switchgear.
faceplate of the SEL-451.
The controller for this application is identified by having only
two (2) pushbuttons (open and close).
•
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i. Turn the LOCAL/REMOTE Selector Switch of the applicable
motor operator to the “LOCAL” position
ii. Remove the cap from the applicable receptacle located
above the appropriate motor operator. The receptacles are
identified as “REC S1” and “REC S2” for the motor operators
associated with the Source 1 switch and the Source 2 switch,
respectively; “REC T” for the motor operator associated with
the tie switch; and “REC F1” through “REC F5” for the motor
operators associated with the individual feeder switches.
iii. Secure the pendant connector from the Hand-Held Controller to the appropriate “REC” receptacle.
iv. Move to the distant location away from the switchgear and
press the “OPEN” or “CLOSE” pushbutton as appropriate to
effect the desired switch-open or switch-close operation.
The run time for the motor to charge and trip the associated switch is approximately 3-4 seconds.
v. After operations on a given motor operator are complete
and the equipment is to be restored to the normal condition:
• If the motor operator has been decoupled from the
switch, make certain the motor operator and the switch
are in the same relative position (open or closed) and
re-couple. If necessary, refer to Section 5.3 for Motor
Operator Operation.
• Disconnect the pendant connector from the applicable
“REC” receptacle.
• Replace the cap on the “REC” receptacle
• Return the LOCAL/REMOTE Selector Switch of the Motor
Operator to the “REMOTE” position; returning control
of the motor operator to the Current-Unbalance or the
SEL-451 relay, as appropriate.
(d) Test Open/Close Operations Using Motor-Operator Toggle Switch
The functionality of the motor operators can be tested (i) to verify
ability to operate and open/close the associated switch when
coupled and (ii) to verify that the motor will operate when the
switch is decoupled. This test can be performed by referring to
section 2.3 “Overview on Manual Operation” and section 5.3 “Motor
Operator Operation” and following the procedures outlined therein.
6.3.3 Duplex Receptacle
A convenience electrical duplex receptacle may be provided on some
bays as an option to supply power for a laptop computer or other
similar load requiring a limited current draw. A duplex receptacle, if
furnished as an option, will typically supply 120 volt AC power to the
connected load and the circuit is fused at 5 amperes. Consequently,
the circuit is NOT adequate for power tools of any type. See Figure 5B.
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7.0 MAINTENANCE
It is the user’s responsibility to establish a written maintenance
program suitable for the application, regulatory requirements, and
general environmental conditions at the installation, while remaining
consistent with the maintenance requirements for equipment of a
similar type. Federal Pacific Instruction Bulletin IB-3A-310LP provides
general guidance for maintenance of switches, fuses and other basic
components. Periodic inspection and cleaning is recommended to
insure that any accumulation of dust or dirt or vermin infestation is
kept controlled. For components not specifically mentioned, the user
should contact the original component manufacturer to establish
applicable maintenance requirements.
7.1 Switch Maintenance
7.2 Motor-Operator Maintenance
The motor operator requires very little maintenance. During regular
switch maintenance check the drive chain. It should be tight and
may need to be lightly oiled. A small amount of grease should be applied to the worm. Infrequently operated switches should have the
motor“exercised” occasionally. To exercise the motor, decouple the
operator. Use the LOCAL control switch to run the motor. A decoupled
motor cannot activate the limit switches so it will continue to run
until stopped. To stop the motor, disconnect power to the operator
or open the shutter over the Manual Operation Access Port. Be sure
to recouple the operator before leaving the site. Follow procedures
described in Section 5.3 Motor Operator Operation.
7.3 Automatic-Transfer Scheme
For automatic-transfer equipment, it is recommended that the
Federal Pacific switchgear does not require routine mechanical or transfer system, including switches, relays and motor operators be
electrical maintenance. However, the following are some recommen- exercised a minimum of once a year if no other exercising frequency
dations for enhancing continued service of the equipment.
is required. Similarly, a general inspection and cleaning should be
performed a minimum of once every five years if a more frequent
1. Yearly mechanical exercising of the switch is recommended.
requirement is not specified by user practices or if environmental
conditions (such as rapid accumulation of contaminates on insulators and insulating materials in particular) indicate a more frequent
The switchgear must be completely de-energized from all sources
cleaning cycle is necessary.
before any attempt is made to enter switchgear. For bays with a
motor operator, interlocks prevent opening the enclosure door Monthly inspection of the status lamps on the SEL-451 is recommended to make certain that no restricting condition exists that would
unless the switch is open and the motor operator is decoupled.
prevent automatic operation under event scenarios involving a loss (or
2. Check for cleanliness generally, but particularly for accumulation reduction) of voltage or the occurrence of an over-current condition.
of any foreign material on insulators and barriers.
WARNING
NOTICE
Barriers and insulators can be cleaned with a non-alcohol based
cleaner that does not leave any residue when dry. Residue must
be removed.
CAUTION
7.4 UPS Battery Maintenance
Maintenance requirements for the UPS battery are specified in the
Falcon® brand “OWNER’S OPERATING MANUAL” furnished with the
metal-enclosed switchgear and the “OWNER’S OPERATING MANUAL”.
The unit specifications can be found on line at:
http://www.falconups.com/industrial-ups-ssg-racktower-datasheet.
pdf
Do not put any lubricant on switch probe or puffer.
3. If the switch is closed on a short circuit within the fault closing
rating and the short circuit is cleared by circuit breakers or fuses,
the switch will not sustain damage which would require major
repairs. However, the switch should be inspected before returning
it to service to determine switch condition.
WARNING
Dual-Purpose Barriers, if provided as an option, should not be
left in the slide-in position for more than one week. Accumulation of contamination on the barrier may cause tracking that can
ultimately lead to a flashover. Clean any contaminated barrier per
instructions above in item “2”.
Never operate the switchgear with any phase-to-phase barrier
removed or out of position. These barriers are required to attain
correct electrical clearances.
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INSTRUCTIONS FOR OPERATION
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BETWEEN TWO SOURCES WITH SPLIT BUS
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APPENDIX A
USER SELECTABLE SETTINGS
The table below and on page 4 shows all the user selectable
settings and the image is from the actual software. The values
shown are random and are not necessarily representative of
appropriate values to use for an automatic-transfer scheme.
The user should select and input values that represent suitable values to use based on the desired operational results
as developed by the engineer/consultant having authority to
establish the values.
Figure A. This image shows all of the “User Selectable Settings” and explanation detail.
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APPENDIX A - continued
AUTOMATIC TRANSFER INITIAL TEST PROCEDURE
The following is an initial test procedure that can be performed to
verify the performance of the automatic-transfer scheme. This test
procedure can also be used for any periodic testing that may be desired.
NOTICE
This test procedure is performed with all MOTOR OPERATORS
COUPLED and will result in temporary outages, depending on the
settings of the various timers, as the automatic-transfer sequence
is performed and again during the RETURN TRANSFER SEQUENCE
unless the RETURN TRANSFER SEQUENCE ON THE SEL-451 is set
for a CLOSED return-transfer sequence.
1. Make certain all settings on the SEL-451 are in compliance with
the engineer of record specifications.
2. Make certain settings on each Model 2722 Current Unbalance Detector applied in feeder bays are in compliance with the engineer
of record specification.
3. Have a reference copy available of all SEL-451 and Current Unbalance Detector settings.
4. Make certain ALL DOORS are CLOSED
5. Make certain ALL MOTOR OPERATORS are COUPLED
6. Make certain all MOTOR OPERATORS are in REMOTE
7. Verify that the following control circuits are closed: FUPS, CB-DC,
CB-AC
8. Turn the AUTO/MANUAL Selector Switch (SS1) to MANUAL
9. Verify that voltage is present on all phases of both Source 1 and
Source 2 (refer to LEDs on SEL-451)
10. If this is an Initial Test Procedure or if complete outages can be
performed, open all Feeder Switches using the Hand-Held Controller Pendant
11. Open Source 1 and Source 2 switches using SEL-451 “SOURCE 1
OPEN” and “SOURCE 2 OPEN” Pushbuttons
12. Verify that the Tie Switch is Open. If necessary, OPEN the Tie
Switch using the “TIE OPEN” pushbutton on the SEL-451
13. CLOSE the Source 1 switch using the “SOURCE 1 CLOSE” pushbutton on the SEL-451
14. CLOSE the Source 2 switch using the “SOURCE 2 CLOSE” pushbutton on the SEL-451
15. Turn the AUTO/MANUAL Selector Switch (SS1) to AUTO – Steps
12-15 reset the SEL-451 position data in the program with all three
switches in the Normal Condition and the system is now in the
AUTO-TRANSFER Mode
16. Verify functionality of AUTO-TRANSFER scheme:
a. If the load feeders are not carrying load, local operations at the
SEL-451 can be performed to verify the functionality of the
AUTO-Transfer scheme if authorized by the Supervisor having
authority and in accordance with the User’s Standard Operating
Procedures, proceed as follows:
i. Open low-voltage circuit breaker CB1 (PT1 secondary circuit
breaker – This creates a loss-of-voltage on Phase 1 of Source
1 and initiates an Auto-Transfer (i.e. when the SOURCE 1
INITIAL TRANSFER DELAY timer times out, Source 1 Switch
will OPEN and Tie Switch will CLOSE) and Source 2 carriers
all the load feeders.
ii. Close low-voltage circuit breaker CB1 (PT1 secondary circuit
breaker – This returns voltage to Phase 1 of Source 1 and (if
“Y” has been selected to Enable Auto Retransfer) initiates
an AUTO-RETRANSFER (i.e. when the SOURCE 1 RETURN
TRANSFER DELAY timer times out and if “CLOSED” has
been selected for the RETURN TRANSFER SEQUENCE, the
Source 1 Switch will CLOSE, paralleling the sources, and the
Tie Switch will OPEN; there is no momentary outage during
the return transfer) and the three switches have returned
to the Normal Condition
b. If the feeders are carrying load current, operations to verify the
functionality of the AUTO-TRANSFER scheme can be performed
using (if purchased) the optional Hand-Held Controller pendant
if authorized by the Supervisor having authority and the User’s
Standard Operating Procedures then proceed as follows:
i. Turn the NORMAL/TEST Selector Switch (SS2) to “TEST”
ii. Remove the cap from the “TEST RECEPTACLE” and secure
the pendant connector of the Hand-Held Controller to the
receptacle
iii. Move the toggle switch for Source 1 Phase 1 to open, which
will initiate an Auto-Transfer (i.e. when the SOURCE 1 INITIAL TRANSFER DELAY timer times out, Source 1 Switch
will OPEN and Tie Switch will CLOSE) and Source 2 carriers
all the load feeders.
iv. Move the toggle switch to return voltage to Phase 1 of Source
1 and (if “Y” has been selected to Enable Auto Retransfer)
initiates an AUTO-RETRANSFER (i.e. when the SOURCE 1
RETURN TRANSFER DELAY timer times out and if “CLOSED”
has been selected for the RETURN TRANSFER SEQUENCE,
the Source 1 Switch will CLOSE, paralleling the sources, and
the Tie Switch will OPEN; there is no momentary outage
during the return transfer) and the three switches have
returned to the Normal Condition
The above 16 (a) and 16 (b) Test Procedure can be repeated for each
phase of each source to completely verify the functionality of the
AUTO-TRANSFER scheme.
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INSTRUCTIONS FOR OPERATION
AUTOMATIC SOURCE TRANSFER WITH SEL-451
BETWEEN TWO SOURCES WITH SPLIT BUS
OCTOBER 2022
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APPENDIX B
DOWNLOADING SEQUENTIAL EVENTS
Figure B1. The image above shows the sequence to access the various screens to get to the data in the sequential event recorder. First, in the Menu bar click on
“Tools” then select “Events”, in the drop-down window select “View Event Files” or “Get Event Files”. Within these selections is source data on the events that have
occurred, which allows graphical analysis and representations. The SEL-451 instruction manual must be consulted to obtain the additional access information
necessary to input settings for event and recorder parameters as well as how to develop oscillography.
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INSTRUCTIONS FOR OPERATION
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APPENDIX C
ROTATING LCD DISPLAY AND TYPICAL “MAIN MENU” SCREENS
All the display points on the “MAIN MENU” screen will not be supported in the SEL-451-5 programming of the Federal Pacific
“Automatic-Source Transfer” control scheme. In particular, the “ONE LINE DIAGRAM” (if any is displayed at all) will not be an
accurate representation of the circuit diagram for the specific metal-enclosed switchgear furnished. In addition, the display
points may vary from unit to unit.
Figure C1. The SEL-451 relay includes an LCD display screen that provides a wealth of information although not all of the functions shown on the
“Main Menu” display are supported by the automatic-transfer scheme program that is in the relay.
With the furnished SEL-451-5 powered up:
1. Pressing the  key will return the screen to the “MAIN
MENU”.
2. Pressing the “ESC” key
△ will stop the screen from scrolling.
◁▽▷
3. Pressing any of the
arrow keys allows scrolling within
the displayed LCD screen to navigate in the direction
indicated by the particular arrow that is pressed.
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INSTRUCTIONS FOR OPERATION
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APPENDIX C - continued
ROTATING LCD DISPLAY AND TYPICAL “MAIN MENU” SCREENS
The display points continuously scrolling on the LCD screen typi- If changes to the Rotating Display are desired, the user must refer
cally include the various field-selectable transfer “settings” that the user to the Instruction Manual for the SEL-451-5 that was shipped with
entered and installed. These transfer settings are shown in Table 1 and the unit for the procedures that apply. The instruction manual was
in Appendix A. A selection of the entries included in the rotating display included on the thumb drive that was shipped with the switchgear.
as shown in the LCD enlargements of Figure C2 below include:
The “MAIN MENU” screen may vary from unit to unit as well. Thus, the
ALT UH DELAY = 3 SEC
user must take the time to scroll through the various “MAIN MENU”
RT CLOSE BEFORE OPEN
display points to establish where the “ROTATING DISPLAY” is located
DEAD SOURCE = 5500 V
as its positioning may vary. A typical “MAIN MENU” list and the conLIVE SOURCE = 6500 V
tents of a few key display points commonly of interest are shown in
UNBALANCE = 500 V
the figures that follow.
BAY 1 DOOR=CLOSED
BAY 2 DOOR=CLOSED
BAY 4 DOOR=CLOSED
BAY 5 DOOR=CLOSED
PRESS  FOR MENU
Figure C2. Views of a few of the typical display points included in the LCD Rotating Display are shown in the above photos. In general, the
transfer settings entered and installed by the user are the selections included in the Rotating Display.
Figure C3. The images above list the typical eleven MAIN MENU display points that are available in the SEL-451 relay. Not all of these MAIN
MENU items are supported in the relay.
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SECTION IB-9D-900
INSTRUCTIONS FOR OPERATION
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OCTOBER 2022
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APPENDIX C - continued
ROTATING LCD DISPLAY AND TYPICAL “MAIN MENU” SCREENS
Figure C4. The “SET/SHOW” screens provide the capability to change the “DATE/TIME” reference in the SEL-451.
Figure C5. The “DISPLAY TEST” screen provides the facility to verify that all of the LEDs are functional. By following the steps sequenced on the display using the
navigation soft keys, the LEDs will all illuminate simultaneously and any LED not illuminated is non-functional.
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INSTRUCTIONS FOR OPERATION
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APPENDIX D - UPS ALARMS and STATUS DISPLAYS
The following information and table is provided as a quick
reference sheet to identify the meaning of the audible alarms
and alarm status for the Falcon® brand SSG Series™ Industrial
Grade UPS. Complete instructions, including Setup, Configuration and Programming of the Falcon® brand UPS supplied with
the equipment are provided in that manufacturer’s “OWNER’S
OPERATING MANUAL” furnished with the Federal Pacific switchgear. In addition, the manual includes, among other things,
instructions on:
Battery Conditioning
If for any reason, the UPS is to be off for an extended period of
time, it is recommended that the UPS battery be charged for
at least 24 hours every 4 to 6 months. This charging duration
and frequency are adequate to avoid deep discharge of the
battery beyond a recovery condition and insure battery life.
Alarms
The Falcon® brand SSG Series™ Industrial Grade UPS includes
six (6) audible alarm codes, each alerting the user of potential
How to Turn On the UPS (with AC power available)
problems. Table D1 below can be used to identify and resolve
How to Start the UPS (without AC power)
alarms and the conditions causing the alarms. In addition, when
How to Turn Off the UPS (when on AC power and without and audible alarm is sounded, the LCD screen will display “bits”
AC power)
that can be recorded and used to inform the service team of
the problem that exists.
Also, the “OWNER’S OPERATING MANUAL” includes descriptions
and visual representations of the LCD display screen describ- Audible Alarms
ing and showing the UPS status for each mode of operation: The table below shows the various audible alarms, the possible
cause and a solution.
NORMAL ON-LINE MODE OPERATION
BATTERY MODE OPERATION
BYPASS MODE OPERATION
GREEN MODE OPERATION
TABLE D1- ALARM REFERENCES FOR FALCON® SSG SERIES™ UPS
Alarm and Possible Cause
Solution
1. Three, short, continuously repeating beeps
The UPS is in Battery Mode
•Utility voltage out of range
Check the input voltage
2. Four, short, continuously repeating beeps
The UPS is in Battery Mode, remove the Input Power and check the input
frequency
•Utility frequency out of range
3. Five, short, continuously repeating beeps
•Internal of UPS over temperature
•The fan is not turning
4. Six, short, continuously repeating beeps
Check the ventilation and remove any blockage
Call Falcon® Service for a fan replacement
•PFC over-current protection is operating
Verify the input AC voltage is not low, remove some load from the UPS
output
5. Seven short beeps followed by three long beeps, repeating after five
seconds
Save the data, turn off the equipment and wait for AC power to return
•Battery low after loss of utility voltage
6. One long beep every few seconds
•Output Overload
•Charger Fail
Check the LCD display
Remove some load
•UPS Alarm, continuous
Record the bits and call Falcon® Service
Every effort is made to ensure that customers receive an up-to-date instruction manual on the use of Federal Pacific products; however, from
time to time, modifications to our products may without notice make the information contained herein subject to alteration.
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