SEL-700G
GENERATOR PROTECTION RELAY
2
KEY FEATURES
Comprehensive Generator Protection
Connect the SEL-700G Generator
Protection Relay across small, medium,
or large generators for complete
primary and backup protection. Adding
the neutral voltage connection provides
100 percent stator ground protection,
based on fundamental-frequency
and third-harmonic neutral-voltage
measurements. Connecting the neutral
current input provides protection for
solidly grounded or resistance-grounded
machines.
Autosynchronizer
Replace external generator control and
synchronizer relays with the built-in
automatic synchronizer function.
Frequency, voltage, and phase control of
the generator are automatically synchronized and connected to the power
system. Monitor the generator synchronization process using generator start
reports and the PC-based synchroscope.
Current Differential Protection
Apply sensitive percentage-restrained
current differential elements and an
unrestrained element, along with
synchronism check and volts-perhertz elements, across the entire unit
to protect both the generator and the
step-up transformer. Optional current
differential elements detect stator faults
using a secure, sensitive current differential function. Power transformer and
CT connection compensation allows the
unit step-up transformer to be included
in the generator differential zone.
Breaker Wear Monitoring
Record accumulated breaker contact
wear with the breaker monitor function,
which uses the manufacturer’s specifications for defining breaker operation
limits. The internal monitor tracks the
total number of close/open operations
and integrates the interrupted current
per phase. Set an alarm to alert operators when measured and accumulated
quantities approach maintenance
thresholds. This information facilitates
proactive breaker maintenance and
replacement without underutilizing
resources.
Easy Communications
Choose from single or dual copper
or fiber-optic Ethernet ports, or
serial communications, and several
protocols, including Mirrored Bits®
communications and IEC 61850. Pick
multiple Modbus® TCP or Modbus serial
sessions for custom configuration of
your application. Use DNP3 Serial or
DNP3 LAN/WAN protocols.
3
FUNCTIONAL OVERVIEW
SEL-700G
P
IAY, IBY, ICY
ANSI NUMBERS/ACRONYMS AND FUNCTIONS
50 GQ
59S
21C/51VC
24
25G
27
32
40
46
49R
49T
50N
50 (P,G,Q)
51G
51N
59N (64G1)
59S
59 (P,G,Q)
60
64F
64G
67G
67N
78
81 (O,U,R)
87
87N
REF
87
27S
VS
50N 51N 67N
24
27
25G
VAX,
VBX, VCX
ERATO
EN
77
R
G
CBCT (Alternate IN)
IN
P
O
59 GQ
64F
81 UR
- SEL-2664
+
ENV
49R
SEL-2600
49T
32
78
40
67G
21
51VC
60
LOP
51G
46
BF
IAX, IBX, ICX
P
50 GQ
IN
50N 51N REF 87N
ADDITIONAL FUNCTIONS
52PB
85 RIO
BF
BRM
DFR
ENV
HMI
LDP
LGC
MET
PMU
SER
RTU
64G
59N
VN
52PB
HMI
DFR
SER
MET
BRM
RTU
LGC
PMU
85
RIO
4
EIA-232
EIA-485
2
Ethernet1
Compensator Distance, Voltage Restrained/Controlled
Time-Overcurrent
Volts/Hertz
Synchronism Check
Undervoltage
Directional Power
Loss-of-Field
Neg. Seq. Overcurrent
Thermal Overload (RTD)
Thermal Model
Neutral Overcurrent
Overcurrent (Phase, Ground, Neg. Seq.)
Ground Time-Overcurrent
Neutral Time-Overcurrent
Neutral Overvoltage
Synchronism Overvoltage
Overvoltage (Phase, Ground, Neg. Seq.)
Loss-of-Potential
Field Ground
100 Percent Stator Ground
Directional Ground Overcurrent
Directional Neutral Overcurrent
Out-of-Step
Frequency (Over, Under, Rate)
Three-Phase Current Differential
Neutral Current Differential
Restricted Earth Fault
1
1
Pushbutton Trip/Close
SEL Mirrored Bits Communications
Breaker Failure
Breaker Wear Monitor
Event Reports
SEL-2600
Operator Interface
Load Data Profiling
SELogic® Control Equations
High-Accuracy Metering
Synchrophasors
Sequential Events Recorder
Remote Terminal Unit
Copper or Fiber-Optic
IRIG-B
FLEXIBLE COMMUNICATIONS
Communications Media
Communications Protocols
Ethernet 10/100BASE-T
SEL ASCII
Ethernet 100BASE-FX
Mirrored Bits communications
Single or dual Ethernet ports
IEC 61850
EIA-232 serial
Modbus RTU/TCP
EIA-485 serial
Simple Network Time Protocol (SNTP)
Fiber-optic, serial multimode ST® connectors
DNP3 serial, LAN/WAN
DeviceNet™
Telnet
FTP
Synchrophasors (IEEE C37.118)
4
PRODUCT OVERVIEW
1
Use default messages, or program up to 32 custom
display labels.
2
Front-panel LEDs can be programmed to indicate
custom alarms.
3
User-configurable label option.
4
Easy-to-use keypad aids simple navigation and set-point
adjustment.
5
Use default pushbuttons, or program your own pushbutton
actions and labels.
6
Power supply options include
24–48 Vdc, 110–250 Vdc, or 110–240 Vac.
7
Single or dual copper or fiber-optic Ethernet port.
8
Positions for optional expansion cards.
9
Voltage and current inputs.
10
Fiber-optic serial port.
11
Mirrored Bits® communications.
12
Optional RTD inputs.
1
4
2
5
3
6
10
7
11
8
12
9
5
APPLICATIONS
COMPLETE GENERATOR PROTECTION
The SEL-700G provides a complete protection and synchronization solution for synchronous generators. Eliminate the
complexity and cost of standalone synchronizer packages.
Integrating the synchronization capability into the generator
protection relay provides the most cost-effective and reliable solution.
Utility Bus
IAY, IBY, ICY
VS
Breaker Control
The optional SEL-2664 Field Ground Module accurately
detects field ground faults whether the generator is
operating, stopped, or de-energized.
SEL-
700G
VAX, VBX, VCX
UNIT PROTECTION
Internal RTDs or
SEL-2600 RTD Module
Apply sensitive percentage-restrained current differential
elements and an unrestrained element, along with synchronism check and volts-per-hertz elements, across the entire
unit to protect both the generator and the step-up transformer. Use harmonic blocking elements to protect the unit
transformer bushing and end windings while maintaining
security for inrush and through-fault conditions.
2664
SEL-
IAX, IBX, ICX
STATOR/FIELD GROUND PROTECTION
IN
Adding the neutral voltage connection provides 100
percent stator ground protection for most machines,
based on fundamental-frequency and third-harmonic
neutral-voltage measurements. Connecting the neutral
current input provides protection for solidly grounded
or resistance-grounded machines. Monitor field ground
insulation resistance with state-of-the-art voltage injection,
provided by the SEL-2664 Module. Protect generators
from damage by responding to low field ground insulation
resistance warnings.
AUTOMATIC GENERATOR CONTROL
SEL’s generation control system regulates generator power
outputs and manages utility interties to maximize system
stability, minimize electrical disturbances, and mitigate loadshedding requirements. The SEL-700G in combination with
SEL’s powerMAX® Power Management and Control System
can balance generation loading, control tie line power flow,
and maintain bus voltage.
The automatic MVAR and voltage control system maintains
MVAR flows on interties and system bus voltages by
controlling load tap changers, generator field and large
synchronous motor exciters, synchronous and static
condensers, and capacitor banks.
6
VN
To the
Power System
From the Stator
CTs and VTs
Transf.
To the Field
Exciter
Exciter
Controller
SEL Volt/VAR
Controller
G
Generator
Prime
Mover
Fuel, Water,
or Steam
Governor
Controller
SEL Generator
Controller
METERING AND REPORTING
SYNCHROPHASOR DATA
View generator autosynchronizer, Sequential Events Recorder
(SER), and 180-cycle oscillographic event reports to analyze
generator startup, shutdown, or system faults. Measure electrical, thermal, and generator run-time quantities.
Apply SEL synchrophasors (IEEE C37.118) to turn state estimation into state measurement, and provide early warning of
potential system instability. The SEL-700G phasor measurement
accuracy meets the IEEE C37.118-2005 Level 1 requirement.
59.996 Hz
Pullman, WA
60.003 Hz
Chicago, IL
59.996 Hz
Philadelphia, PA
Ch
ica
go
Tampa
Mo
nte
r
n
Sa
il
rey
t
An
Ph
Pullman
ia
lph
e
ad
io
on
60.015 Hz
60.0 Hz
60.007 Hz
Monterrey, Mexico
San Antonio,TX
Tampa, FL
AUTOSYNCHRONIZER
RETROFIT REPLACEMENT KITS
The optional, built-in automatic synchronizer function
eliminates the need for expensive external synchronizing
equipment. Frequency, voltage, and phase angle of the
generator are automatically synchronized and connected
to the power system.
Replace existing generator protection with the SEL-700G and the
applicable mounting kit. These kits provide everything needed to
replace many existing generator relays with the SEL-700G.
No cutting or drilling is required when you use the optional
mounting kits. Replacement of existing protection is quick
and easy.
RTD-BASED THERMAL PROTECTION
Acquire thermal data for alarm, monitoring, and trip functions in the SEL-700G with a 10 resistance temperature
detector (RTD) input card or an external 12 RTD SEL-2600
RTD Module.
GENERATOR
PRIME
MOVER
7
EASY TO SET AND USE
USE ACSELERATOR QUICKSET® SEL-5030 SOFTWARE TO SET, MONITOR,
AND CONTROL THE SEL-700G
• Save engineering time while keeping flexibility. Communicate with the SEL-700G
through any ASCII terminal, or use the acSEL erator QuickSet graphical user
interface.
• Develop settings offline with a menu-driven interface and completely documented
help screens. Speed installation by copying existing settings files and modifying
application-specific items.
• Simplify the settings procedure with rules-based architecture to automatically
check interrelated settings. Out-of-range or conflicting settings are highlighted
for correction.
• Use the acSEL erator® human-machine interface (HMI) synchroscope to view the realtime synchronization process.
• Initiate the generator synchronization process using an HMI pushbutton.
USE ACSELERATOR SOFTWARE TO RETRIEVE AND DISPLAY EVENT
REPORTS RECORDED BY THE SEL-700G
• Display event report oscillograms. View each report as a plot of magnitude versus
time. Select analog and digital points to build a custom display.
• Display phase and symmetrical component phasors. Display the phasor view of
electrical data to better understand asymmetrical, three-phase faults. Build a
custom plot using per-phase and symmetrical component sequence currents
and voltages.
• Retrieve event reports using serial or Ethernet communications links.
MAKING ELECTRIC POWER SAFER,
MORE RELIABLE, AND MORE ECONOMICAL
SCHWEITZER ENGINEERING
LABORATORIES, INC.
Tel:+1.509.332.1890
Email:info@selinc.com
Web:www.selinc.com
© 2009–2014 by Schweitzer Engineering Laboratories, Inc.
PF00211 · 20140425