CSC-121
Breaker Protection IED
Product Guide
Version V1.10
Doc. Code: 0SF.492.053(E)
Issued Date 2012.8
Copyright owner: Beijing Sifang Automation Co., Ltd.
Note: The company keeps the right to perfect the instruction. If equipments do not agree with the
instruction at anywhere, please contact our company in time. We will provide you with corresponding
service.
®
is registered trademark of Beijing Sifang Automation Co., Ltd.
We reserve all rights to this document, even in the event that a patent is issued and a different
commercial proprietary right is registered. Improper use, in particular reproduction and dissemination
to third parties, is not permitted.
This document has been carefully checked. If the user nevertheless detects any errors, he is asked to
notify us as soon as possible.
The data contained in this manual is intended solely for the IED description and is not to be deemed
to be a statement of guaranteed properties. In the interests of our customers, we constantly seek to
ensure that our products are developed to the latest technological standards as a result; it is possible
that there may be some differences between the hardware/software product and this information
product.
Manufacturer:
Beijing Sifang Automation Co., Ltd.
Overview
Overview
The CSC-121 is selective, reliable and
high speed breaker management and
backup
protection
IED
(Intelligent
Electronic Device), which is used as
backup protection cooperating with main
protection in different applications such as
overhead line, cable, transformer, reactor
and busbar protection. It can also work as
a dedicated breaker management relay for
circuit breaker.
The IED has powerful capabilities to cover
following applications:

Used in a wide range of voltage levels,
up to 1000kV

Applied to overhead lines and cables,
as backup protection IED

Applicable in subtransmission network
and distribution network


Breaker management protection for
any substation arrangement such as
one and half breakers arrangement,
double bus arrangement, etc.

Work as a dedicated breaker
protection for single circuit breaker

Suitable for single pole/three poles
tripping and closing conditions

Communication with station automation
system
The IED provides a completely protection
functions
library,
including
current
protection, voltage protection, auto-reclosing, breaker failure protection,
thermal overload protection, etc., to cover
most of the requirements of different
applications.
The wide application flexibility makes the
IED an excellent choice for both new
installations and retrofitting of the existing
stations.
Applied to transformer as backup
protection IED
1
Feature


Protection and monitoring IED
extensive functional library,
configuration
possibility
expandable hardware design to
with user’s special requirements
with
user
and
meet
check (25)
A complete protection functions library,
include:



Auto-reclosing function for singleand/or three-phase reclosing (79)

Voltage transformer secondary
circuit supervision (97FF)

Current transformer
circuit supervision
secondary
Overcurrent protection (50, 51,
67)

Earth fault protection (50N, 51N,
67N)
Self-supervision to all modules in the
IED

Complete
information
recording:
tripping reports, alarm reports, startup
reports and general operation records.
Any kind of reports can be stored up to
2000 and be memorized in case of
power disconnection

Up to three electric/optical Ethernet
ports can be selected to communicate
with substation automation system by
IEC61850
or
IEC60870-5-103
protocols

Up to two electric RS-485 ports can be
selected to communicate with sub-station
automation
system
by
IEC60870-5-103 protocol

Time synchronization via network
(SNTP), pulse and IRIG-B mode

Configurable LEDs (Light Emitting
Diodes) and output relays satisfied
users’ requirement

Neutral earth fault protection (50G,
51G, 67G)

Sensitive earth fault protection
(50Ns, 51Ns, 67Ns)

Negative-sequence
protection (46)

Thermal overload protection (49)

Overload protection (50OL)

Overvoltage protection (59)

Undervoltage protection (27)

Displacement voltage protection
(64)

Circuit breaker failure protection
(50BF)
overcurrent

Poles discordance
(50PD)

Dead zone protection (50DZ)

Versatile human-machine interface

STUB protection (50STUB)


Synchro-check
Multifunctional software tool for setting,
monitoring, fault recording analysis,
configuration, etc.
and
protection
energizing
2
Function
Protection functions
IEC 61850
Description
ANSI Code
Logical Node
Name
IEC 60617
graphical symbol
Current protection
3IINV>
Overcurrent protection
50,51,67
PTOC
3I >>
3I >>>
I0INV>
Earth fault protection
50N, 51N, 67N
PTEF
I0>>
I0>>>
Neutral earth fault protection
50G, 51G, 67G
Sensitive earth fault protection
50Ns, 51Ns,
3INE>
67Ns
3INE>>
Negative-sequence overcurrent protection
46
Thermal overload protection
49
PTTR
Ith
Overload protection
50OL
PTOC
3I >OL
Voltage protection
Overvoltage protection
59
PTOV
Undervoltage protection
27
PTUV
Displacement voltage protection
64
3U>
3U>>
3U<
3U<<
VE>
Breaker control function
3I> BF
Breaker failure protection
50BF
RBRF
I0>BF
I2>BF
3I> DZ
Dead zone protection
50DZ
I0>DZ
I2>DZ
STUB protection
50STUB
PTOC
3I>STUB
3I< PD
Poles discordance protection
50PD
RPLD
I0>PD
I2>PD
Synchro-check and energizing check
25
RSYN
3
Function
Auto-reclosing
79
RREC
Single- and/or three-pole tripping
94-1/3
PTRC
O→I
Secondary system supervision
CT secondary circuit supervision
VT secondary circuit supervision
97FF
Monitoring functions
Description
Synchro-check reference voltage supervision
Auxiliary contacts of circuit breaker supervision
Self-supervision
Fault recorder
Station communication
Description
Front communication port
Isolated RS232 port for maintaining
Rear communication port
0-2 isolated electrical RS485 communication ports, support IEC 60870-5-103 protocol
0-3 Ethernet electrical/optical communication ports, support IEC 61850 protocol or IEC 60870-5-103
protocol
Time synchronization port, support GPS pulse or IRIG-B code
IED software tools
Functions
Reading measuring value
Reading IED report
4
Function
Setting
IED testing
Disturbance recording analysis
IED configuration
Printing
5
Function
Application for line
3I >>>
50
50N
3U>
59
PIOC
PTOV
I0>>>
64
3I>>,3I>
27
MEASUREMENT
UE>
PIEF
51/67
3U<
PTOC
PTUV
51N/67N I0>>,I0>
50STUB 3I>STUB
PTEF
PTOC
Ith
49
50PD
50BF
PD
RPLD
PTTR
50DZ
3I>BF
MONITORING
STATION
COMMUNICATION
- RS232/485
- RJ45/FO
- IEC61850
- IEC60870-5-103
RBRF
25
RSYN
46
O→I
79
RREC
94
PTRC
6
Fault recording
Function
Application for transformer
50BF
50
Ith
49
3I>BF
3I >>>
94
59
PTRC
PD
PIEF
51/67 3I>>,3I>
PTOC
PIOC
I0>>>
50N
PTTR
RBRF
PD
50STUB 3I>STUB
RPLD
51N/67N I0>>,I0>
PTOC
46
50DZ
PTEF
27
3U>
PTOV
UE>
64
3U<
PTUV
50G
CSC121 IED-1
51G/67G
PIOC
PTOC
HV
LV
CSC121 IED-2
94
PTRC
MV
50BF
3I>BF
49
RBRF
3I >>>
50
PD
Ith
51/67
PIOC
50DZ
PD
RPLD
PTTR
50N I0>>>
PIEF
46
3I>>,3I>
PTOC
59
27
3U>
64
3U<
51N/67N I0>>,I0>
PTEF
UE>
PTUV
PTOV
CSC121 IED-3
PIOC
PTOC
50BF
3I>BF
RBRF
50
94
50G
51G/67G
3I >>>
PIOC
49
Ith
PTRC
50N
PTTR
I0>>>
51/67 3I>>,3I>
51N/67N I0>>,I0>
PTOC
PTOC
59
3U>
PTOV
7
PD
27
3U<
PTUV
PD
RPLD
PIOC
46
50DZ
64
UE>
Protection
Overcurrent protection
(50, 51, 67)
is provided to prevent overcurrent
protection from mal- -operation.
Furthermore, by recognition of the inrush
current in one phase, it is possible to set
the protection in a way that not only the
phase with the considerable inrush current,
but also the other phases of the
overcurrent protection are blocked for a
certain time. This is achieved by
cross-blocking feature integrated in the
IED.
The protection provides following features:

Two definite time stages

One inverse time stage

11 kinds of IEC and ANSI inverse time
characteristic curves as well as
optional user defined characteristic

Selectable
directional
element
characteristic angle to satisfy the
different network conditions and
applications

Each stage can be set individually as
directional/non-directional

The inrush restraint function has a
maximum inrush current setting. Once the
measuring current exceeds the setting, the
overcurrent protection will not be blocked
any longer.
Characteristic of direction
element
Each stage can be set individually for
inrush restraint

Cross blocking function for inrush
detection

Settable maximum inrush current

VT secondary circuit supervision for
directional protection. Once VT failure
happens, the directional stage can be
set to be blocked or to be
non-directional stage
The direction detection is performed by
determining the position of current vector
in directional characteristic. In other word,
it is done by comparing phase angle
between the fault current and the reference
voltage, Figure 1 illustrates the direction
detection characteristic for phase A
element.
Forward
90°
IA
Inrush restraint function
The protection relay may detect large
magnetizing
inrush currents during
transformer energizing. In addition to
considerable
unbalance
fundamental
current, Inrush current comprises large
second harmonic current which does not
appear in short circuit current. Therefore,
the inrush current may affect the protection
functions which operate based on the
fundamental component of the measured
current. Accordingly, inrush restraint logic
ΦPh_Char
0°
U BC_Ref
IA
Reverse
Figure 1 Direction detection characteristic of
overcurrent protection directional element
8
Protection
where:
enabled/disabled by setting
ФPh_Char: The settable characteristic angle
The assignment of the applied measuring
values used in direction determination has
been shown in Table 1 for different types of
faults.

Each stage can be set individually as
directional/non-directional

Directional element can be set to be
forward toward the protected object or
reverse toward system for all stages

Settable
directional
element
characteristic angle to satisfy the
different network conditions and
applications

Each stage can be set individually for
inrush restraint

Settable maximum inrush current

VT secondary circuit supervision for
directional protection function. Once
VT failure happens, the directional
stage can be set to be blocked or to be
non-directional

Zero-sequence current is calculated by
summation of 3 phase currents or
measured from earth phase CT
selectable
Table 1 Assignment of applied current and
reference voltage for directional element
Phase
Current
Voltage
A
Ia
U bc
B
Ib
U ca
C
Ic
U ab
For three-phase short-circuit fault, without
any healthy phase, memory voltage values
are used to determine direction clearly if
the measured voltage values are not
sufficient. The detected direction is based
on the voltage of previously saved cycles.
Earth fault protection
(50N, 51N, 67N)
The Earth fault protection can be used to
clear phase to earth faults as system
back-up protection.
Directional element

Two definite time stages
The earth fault protection adopts zero
sequence directional element which
compares the zero sequence system
quantities:

One inverse time stage


11 kinds of the IEC and ANSI inverse
time characteristic curves as well as
optional user defined characteristic
3I0, current is calculated from the sum
of the three phase currents or
measured from earth phase CT

3U0, the voltage is used as reference
voltage if it is connected. Otherwise,
3U0, the zero sequence voltage,
calculated from the sum of the three
phase voltages
The protection provides following features:

Zero sequence directional element

Negative sequence directional element
is applied as a complement to zero
sequence directional element. It can be
9
Protection
Bisector
-3I 0
90°
Bisector -3 I 2
Reverse
90°
Reverse
0°
0°
3U 0_Ref
3 U 2_ Ref
Φ0_Char
Forward
-3I 0
Φ2_Char
Forward
Bisector
-3I 2
Bisector
Figure 2 Direction detection characteristic of
Figure 3 Direction detection characteristic of
zero sequence directional element
negative sequence directional element
where:
where:
Ф2_Char: The settable characteristic angle
Ф0_Char: The settable characteristic angle
Two operation areas are provided for
direction determination, the forward area
toward the protected object and the
reverse area toward the system, which are
shown in Figure 2.
Furthermore, under the VT failure situation,
it can be set to block directional earth fault
protection or to apply non- -directional
earth fault protection.
For earth fault protection, users can
choose negative sequence directional
element as the complement of zero
sequence directional element. It can be
used in case of too low zero sequence
voltage due to some fault condition e.g. the
unfavorable zero-sequence. The negative
sequence
directional
element
characteristic is shown in Figure 3.
The protection relay may detect large
magnetizing
inrush currents during
transformer energizing. In addition to
considerable unbalanced fundamental
current, inrush current comprises large
secondary harmonic current which doesn’t
appear in short circuit current. Therefore,
the inrush current may affect the protection
functions which operate based on the
fundamental component of the measured
current. Accordingly, inrush restraint logic
is provided to prevent earth fault protection
from maloperation.
Inrush restraint function
Since inrush current cannot be more than a
specified value, the inrush restraint
provides an upper current limit in which
blocking does not occur.
10
Protection
Neutral earth fault
protection (50G, 51G,
67G)
Inrush restraint feature
The neutral earth fault protection may
detect large magnetizing inrush currents
flowing when transformer is energized.
The neutral earth fault protection focus on
phase to earth faults. The measuring
current is the one from dedicated neutral
CT.
Directional element
Directional determination of neutral earth
fault elements adopts the zero sequence
directional element as same as the one
applied by earth fault protection. The only
difference is the measured current, which
is measured from the neutral point CT
instead of being calculated from three
phase currents.
The following features are provided:

Two definite time stages

One inverse time stage

11 kinds of the IEC and ANSI inverse
time characteristic curves as well as
optional user defined characteristic

Each stage can be set
directional/non-directional
independently

Zero sequence directional element is
applied. Its characteristic is as same as
earth fault protection illustrated in
Figure 2
to

Directional element can be set to be
forward towarda the protected object or
reverse toward system for all stage

Settable
directional
element
characteristic angle to satisfy the
different network conditions and
applications

Sensitive earth fault
protection (50Ns,
51Ns, 67Ns )
be
The function provides a high sensitive
earth fault protection for cables and high
impedance grounded or isolated systems
where single phase short circuit current is
made by capacitive current. Furthermore,
the function can operate with/without
selective tripping according to fault
direction.
Sensitive earth fault protection integrated
in the IED provides following features:
Inrush restraint function can be set for
each stage separately

Settable maximum inrush current

VT secondary circuit supervision for
directional protection function

Neutral current is measured from
dedicated neutral CT
11

Two definite time stages

One inverse time stage

11 kinds of IEC and ANSI inverse time
characteristic curves as well as
optional user defined characteristic

Sensitive earth fault directional element
with 3U0/3I0-Φ principle
Protection




Sensitive earth fault directional element
with CosΦ principle
detection:

Settable
directional
element
characteristic angle to satisfy the
different network conditions and
applications
Directional
sensitive
earth
fault
detection
based
on
U0/I0-Φ
measurement (see Figure 4)
Forward
90°
- I NS
Each stage can be set to be directional,
or non-directional independently
Bisector
Each stage can be set individually to
alarm or trip

Displacement voltage can be checked
to increase function reliability

Dedicated sensitive CT

VT secondary circuit supervision for
directional protection function
ΦNS_Char
0°
3U0_Ref
I NS
For compensated-earthed system or high
resistance earthed system with outgoing
cable feeders, the directional protection is
provided during a single phase fault.
Figure 4 Direction detection characteristic of the
sensitive earth fault directional element by
U0/I0-Φ
where:
ФNS_CA: The settable characteristic angle
In general, for high impedance earthed
system, whenever a feeder has a high
capacitive current - normally one greater
than 10% of the current limited by the
neutral earthing impedance – a simple
sensitive earth fault relay is no longer
enough to give sensitive and selective
protection. In this case, the protection
system for the feeder consists of a
directional sensitive earth fault relay whose
threshold can be set to below the
capacitive current.

Based on current vector component
(Cos Φ) measurement (see Figure 5).
In this way, the relay is sensitive to the
active residual current and insensitive
to the capacitive current.
IS
90°
0°
Forward
In order to discriminate forward and
reverse short circuits, the IED provides two
methods for sensitive earth fault direction
detection which should be utilized to cover
all network configurations according to the
type of grounding. The following
characteristic is possible for directional
3U0_Ref
- IS
12
Protection
Thermal overload
protection (49)
Figure 5 Direction detection characteristic of the
sensitive earth fault directional element by Cos
Φ
A sensitive current transformer is provided
to detect the small earth fault current (weak
zero sequence current) in isolated
networks or in networks with high
impedance earthing where the earth fault
current is extremely small.
The insulating material surrounding the
windings ages rapidly if the temperature
exceeds the design limit value. Thus, a
thermal protection function is required to
supplement
the
existing
winding
temperature device. The thermal overload
protection estimates winding temperature
and thus prevents it from thermal
damaging.
Negative-sequence
overcurrent protection
(46)
The thermal overload protection operates
based on an approximate replica of the
temperature rise in the protected object
caused by overload.
A negative sequence (or phase unbalance)
protection is essentially provided for the
protection of generators, motors and
feeders against unbalanced loading that
may arise due to phase-to-phase faults. In
addition, it is useful in detecting
asymmetrical
short
circuits
with
magnitudes lower than the maximum load
current, especially in delta side of the
transformers.
The memorized thermal replica can be
implemented based on thermal models
(Cold or Hot Curve) of IEC60255-8
standard.
The thermal overload in the IED is
provided with one trip stage as well as one
alarm stage. It is possible to set the alarm
stage at a certain percentage of the setting
value applied at the trip stage.
The protection provide following features:

Two definite time stages

One inverse time stage

11 kinds of IEC and ANSI inverse time
characteristic curves as well as
optional user defined characteristic

The calculation is performed separately for
each phase, based on fundamental
component and harmonic components.
Overload protection
(50OL)
The first definite stage and inverse
stage can be set individually as alarm
or trip stages
The IED supervises load flow in real time.
If each phase current is greater than the
dedicated setting for a set delay time, the
protection will issue alarm.
Furthermore, this protection function may
be used to detect interruptions, faults, and
polarity problems with CT.
13
Protection
Overvoltage protection
(59)
undervoltage function will be blocked
when VT failure happens

The overvoltage protection detects
abnormally network and machine high
voltage conditions. Overvoltage conditions
may occur possibly in the power system
during abnormal conditions such as
no-load, light load, or open line end on long
line. The protection can be used as open
line end detector or as system voltage
supervision normally.
The protection provides following features:

Two definite time stages

Each stage can be set to alarm or trip

Measuring voltage between phase-earth voltage and phase-phase
selectable

Settable dropout ratio
Settable dropout ratio
Displacement voltage
protection (64)
The displacement voltage protection is
able to monitor the displacement voltage to
detect the earth fault in power system. It is
usually applied in non-solidly earthed
networks where the earth fault current is
limited.
The displacement voltage 3U0 can be
either directly measured from VT or
calculated based on connected three
phases to earth voltages. In the latter case,
the three voltages transformers input must
be
connected
in
an
earth-wye
configuration.
The protection provide following features:
Undervoltage
protection (27)
The undervoltage protection provides
protection against dangerous voltage
drops, especially for electric machines.
The protection function provides following
features:

Two definite time stages

Each stage can be set to alarm or trip

Measuring voltage between phase-earth voltage and phase-phase
selectable

Current criteria supervision

Circuit
breaker
supervision

VT secondary circuit supervision, the
aux.

Two definite time stages

Each stage can be set to alarm or trip

3U0 based on calculated summation of
3 phase voltage or measured injected
residual voltage
Breaker failure
protection (50BF)
The circuit breaker failure protection is
designed to detect failure of the circuit
breaker during a fault clearance. It ensures
fast back-up tripping of surrounding
breakers by tripping relevant bus sections.
The protection can be single- or
three-phase started to allow use with
single phase tripping applications.
contact
Once a circuit breaker operating failure
14
Protection
occurs on a feeder/transformer, the bus
section which the feeder/transformer is
connected with can be selectively isolated
by the protection. In addition a transfer trip
signal is issued to trip the remote end
circuit breaker of the feeder.
by protection relay while CB auxiliary
contacts indicate the CB is open.
The current criteria are in combination with
three phase current, zero and negative
sequence current to achieve a higher
security.
When one bus side CT of feeder or
transformer is applied, once a fault occurs
in the dead zone, the IED trips the relevant
busbar zone. Tripping logic is illustrated in
Figure 6.
The function can be set to give single- or
three phase re-tripping of the local breaker
to avoid unnecessary tripping of
surrounding breakers in the case of two
available trip coils.

Internal/ external initiation

Self-adaptive for bus side CT or line
side CT
Trip
Bus
Additionally, during single pole tripping,
stage 1 is able to re-trip three phase with
settable delay time after single phase
re-tripping failure.

Two trip stages (local and surrounding
breaker tripping)

Transfer trip command to the remote
line end in second stage

Internal/ external initiation

Single/three phase CBF initiation

Selectable CB Aux contacts checking

Current criteria checking (including
phase current, zero and negative
sequence current)
IFAULT
Line1
Opened CB
Line2
LineN
Closed CB
Figure 6 Tripping logic applying bus side CT
When one line side CT is applied and a
fault occurs in the dead zone, protection
relay sends a transfer trip to remote end
relay to isolate the fault. Tripping logic is
illustrated in Figure 7.
Dead zone protection
(50DZ)
The IED provides dead zone protection to
protect the area, between circuit breaker
and CT in the case that CB is open.
Therefore, by occurrence of a fault in dead
zone, the short circuit current is measured
15
Protection
Figure 8 Tripping logic applying transformer side
CT
Bus
Inter trip
STUB protection
(50STUB)
The VT is mostly installed at line side of
transmission lines. Therefore, for the case
that transmission line is taken out of
service and the line disconnector is
opened, the distance protection will not be
able to operate and must be blocked.
IFAULT
Line1
Line2
Trip
LineN
The STUB protection protects the zone
between the CTs and the open
disconnector. The STUB protection is
enabled when the open position of the
disconnector is connected to IED binary
input. The function supports one definite
stage which related concept is shown in
Figure 9.
Relay
Opened CB
Closed CB
Figure 7 Tripping logic applying line side CT
When one transformer side CT is applied
and a fault occurs in the dead zone,
protection relay trip the circuit breakers of
the others transformer winding. Tripping
logic is illustrated in
Bus A
Figure 8.
Bus B
Delay trip
IFAULT
trip
IFAULT
Bus1
Line
A
Line
B
Legend:
IFAULT
Closed CB
Ln
L1
Figure 9 Tripping logic of STUB protection
T1
Bus2
Bus3
Opened CB
Closed CB
16
Protection
Poles discordance
protection (50PD)
 Synch-check
The phase segregated operating circuit
breakers can be in different positions
(close-open)
due
to
electrical
or
mechanical failures during the system
normal operation.
 Override
 Energizing check, and synch-check if
energizing check failure

 Dead V4 and dead V3Ph
 Dead V4 and live V3Ph
The protection operates based on
information from auxiliary contacts of the
circuit breaker with additional criteria.
The
protection
functions:
performs
 Live V4 and dead V3Ph
Synchro-check reference
voltage supervision
following

3 phase CB Aux contacts supervision

Current criteria checking (including
phase current, zero and negative
sequence current)
If the automatic reclosing is set for
synchronization check or energizing check,
during the automatic reclosing period, the
synchronization condition of the voltages
between both sides of CB cannot be met,
an alarm will be issued after default time
delay.
Synchro-check and
energizing check (25)
Auto-reclosing (79)
The synchro-check function checks
voltages of the circuit breaker sides for
synchronism conditions.
For restoration of the normal service after a
fault an auto reclosing attempt is mostly
made for overhead lines. Experiences
show that about 85% of faults have
transient nature and will disappear after an
auto reclosing attempt is performed. This
means that the line can be re-energized in
a short period. The reconnection is
accomplished after a dead time via the
automatic reclosing function. If the fault is
permanent or short circuit arc has not been
disappeared, the protection will re-trip the
breaker.
Main
features
of
the
Auto-reclosing are as follows:
The synchronization function ensures the
stability of the network in three phase
reclosing condition. To do this, the two side
voltages of the circuit breaker are
compared in terms of magnitude, phase
angle
and
frequency
differences.
Additionally, closing can be done safely in
conditions that at least one side of the CB
has dead voltage.

Available for automatic
(internally or externally)

Based on voltage/ angle/ frequency
difference

Modes of energizing check:
reclosing
Synchro-check conditions:
17

Up to 4 shots (selectable)

Individually settable dead time for three
phase and single phase fault and for
each shot
Protection

External AR initiation

Single/three phase AR operation

CB ready supervision

CB Aux. contact supervision

Cooperation with internal synch-check
function for reclosing command
Voltage transformer secondary
circuit supervision
A measured voltage failure resulting from a
broken conductor or a short circuit fault in
the
secondary
circuit
of
voltage
transformer may result in unwanted
operation of the protection functions which
work based on voltage criteria. VT failure
supervision function is provided to block
these protection functions and enable the
backup protection functions. The features
of the function are as follows:
Secondary system
supervision
Current transformer secondary
circuit supervision
Open or short circuited CT cores can
cause unwanted operation of some
protection functions such as earth fault
current and negative sequence current
functions.
Interruption of the CT secondary circuit is
detected based on zero-sequence current.
Once CT failure happens, each stage of
earth fault protection is blocked.
18

Symmetrical/asymmetrical VT failure
detection

3-phase AC voltage MCB monitoring

1-phase AC voltage MCB monitoring

Zero and negative sequence current
monitoring

Applicable
in
solid
grounded,
compensated or isolated networks
Monitoring
Synchro-check reference
voltage supervision
energizing. Parts of the modules are
self-supervised in real time. All internal
faults or abnormal conditions will
initiate an alarm. The fatal faults among
them will result in the whole IED
blocked
If the automatic reclosing is set for
synchronization check or energizing check,
during the automatic reclosing period, the
synchronization condition of the voltages
between both sides of CB cannot be met,
an alarm will be issued after default time
delay.

CPU module and communication
module perform real time
inter-supervision. Therefore
communication interruption between
them is detected and related alarm will
be given

CRC checks for the setting, program
and configuration, etc.
Self-supervision

All modules can perform
self-supervision to its key hardware
components and program, as soon as
19
Communication
Station communication
system. These two ports can work in
parallel for IEC60870-5-103.
Overview
Ethernet communication
ports
The IED is able to connect to one or
more substation level systems or
equipments simultaneously, through the
communication ports with
communication protocols supported.
(Shown in Figure 10)
Up to 3 electrical or optical Ethernet
communication ports are provided to
connect with substation automation system.
These two out of three ports can work in
parallel for protocol, IEC61850 or
IEC60870-5-103.
Front communication port
Communication protocol
There is a serial RS232 port on the front
plate of all the IEDs. Through this port,
the IED can be connected to the
personal computer for setting, testing,
and configuration using the dedicated
Sifang software tool.
The IED supports station communication
with IEC 61850-8 and IED60870-5-103
protocols.
By means of IEC61850, GOOSE peer- to
peer communication make it possible that
bay IEDs can exchange information to
each other directly. And a simple
master-less system can be set up for bay
and system interlocking and other
interactive function.
RS485 communication ports
Up to 2 isolated electrical RS485
communication ports are provided to
connect with substation automation
Server or
Work Station 1
Work Station 3
Server or
Work Station 2
Switch
Work Station 4
Net 1: IEC61850/IEC103,Ethernet Port A
Switch
Net 2: IEC61850/IEC103,Ethernet Port B
Switch
Switch
Switch
Gateway
or
converter
Switch
Gateway
or
converter
Net 4: IEC103, RS485 Port B
Net 3: IEC103, RS485 Port A
Figure 10 Connection example for multi-networks of station automation system
Note: All four ports can work in parallel
20
Communication
Time synchronization port
synchronization modes.
All IEDs feature a permanently integrated
electrical time synchronization port. It can
be used to feed timing telegrams in IRIG-B
or pulse format into the IEDs via time
synchronization receivers. The IED can
adapt the second or minute pulse in the
pulse mode automatically.
SNTP
Meanwhile, SNTP network time
synchronization can be applied.
Ethernet port
The Figure 11 illustrates the optional time
IRIG-B
IRIG-B port
Pulse
Binary input
Figure 11 Time synchronizing modes
21
Software tool
A user-friendly software tool is offered for
engineering, setting, disturbance analysis
and monitoring. It provides versatile
functionalities required throughout the life
cycle of protection IEDs. Its features are as
follows:



diagrams, vector diagrams, bar charts
and data sheet.
Device administration in projects with
freely configurable hierarchies for any
substation and electrical power station
topology
Modification, import and export of
parameter sets sorted by protection
functions, with setting logicality check
Precise fault analysis with visualization
of fault records in curves, circle
22

Intelligent plausibility checks rule out
incorrect input

Graphical visualization of charac-teristics and zone diagrams with direct
manipulation of the curves

Password-protected
access
for
different jobs such as parameter setting,
commissioning
and
controlling
(authorized staff only)

Testing and diagnostic functions
–decisive support in the commissioning
phase
Hardware
Front plate
The whole front plate is divided into
zones, each of which has a well-defined
functionality:
5
1
4
CSC-161
2
3
6
8
7
Figure 12 IED front plate
1
Liquid crystal display (LCD)
5
Reset key
2
LEDs
6
Quit key
3
Shortcut function keys
7
Set key
4
Arrow keys
8
RS232 communication port
Rear plate
Test port
X10
For BIM and BOM
X9
X8
X7
X6
Ethernet ports
X5
X4
PSM
X3
X2
X1
COM
CPU
AIM
Figure 13 Rear plate of the protection IED
23
Hardware
provided in communication module to meet
the communication demands of different
substation automation system and RTU at
the same time.
Modules
Analogue Input Module (AIM)
The time synchronization port is equipped,
which can work in pulse mode or IRIG-B
mode. SNTP mode can be applied through
communication port.
The analogue input module is used to
galvanically separate and transform the
secondary
currents
and
voltages
generated by the measuring transformers.
CPU Module (CPU)
In addition, a series printer port is also
reserved.
The CPU module handles all protection
functions and logic.
Binary Input Module (BIM)
The binary input module is used to connect
the input signals and alarm signals such as
the auxiliary contacts of the circuit breaker
(CB), etc.
The redundant A/D sampling channels are
equipped. By comparing the data from
redundant
sampling
channels,
any
sampling data errors and the channel
hardware faults can be detected
immediately and the proper alarm and
blocking is initiated in time.
Binary Output Module (BOM)
The binary output modules mainly provide
tripping output contacts, initiating output
contacts and signaling output contacts. All
the tripping output relays have contacts
with a high switching capacity and are
blocked by protection startup elements.
Communication Module (COM)
The communication module performs
communication between the internal
protection system and external equipments
such as HMI, engineering workstation,
substation automation system, RTU, etc.,
to transmit remote metering, remote
signaling, SOE, event reports and record
data.
Each output relay can be configured to
satisfy the demands of users.
Power Supply Module (PSM)
The power supply module is used to
provide the correct internal voltages and
full isolation between the terminal and the
battery system.
Up to 3 channels isolated electrical or
optical Ethernet ports and up to 2 channels
RS485 serial communication ports can be
24
Hardware
Dimension
E
C
A
D
B
Figure 14 4U, 19” case with rear cover
Table 2 Dimension of the IED case
Legend
A
B
C
D
E
Dimension (mm)
177
482.6
265
320
437.2
D
C
E
A
B
Figure 15 Cut-out on the panel
Table 3 Dimension of the cutout for IED mounting
Legend
A
B
C
D
E
Dimension (mm)
450
465
161.6
178
6.5
25
Connection
A. Typical rear terminals diagram
X4
X1
a01
b01
a02
b02
a03
b03
a04
b04
a05
b05
a06
b06
a07
b07
a08
b08
a09
b09
a10
b10
a11
b11
a12
b12
BI01
BI02
BI03
BI04
BI05
BI06
BI07
BI08
BI09
BI10
BI11
BI12
BI13
BI14
BI15
BI16
BI17
BI18
BI19
BI20
BI21
BI22
BI23
BI24
BI25
BI26
BI27
BI28
BI29
BI30
BI-COM1(-)
BI-COM2(-)
CSC-121
IA
IB
IC
I0
I4
Null
Null
Null
Null
Null
Null
Null
Null
U4
UB
UC
UA
UN
X3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Null
Null
Null
Null
RS485 - 2B
RS485 - 2A
RS485 - 1B
RS485 - 1A
GPS
GPS - GND
Null
Null
Null
Null
Null
Null
X5
Output relay 01
Output relay 02
Output relay 03
Output relay 04
1)
Ethernet Port 1 - RJ45
Ethernet Port 2 - RJ45
a02
c02
a04
c04
a06
c06
a08
c08
a10
c10
a12
c12
a14
c14
a16
c16
a18
c18
a20
c20
a22
c22
a24
c24
a26
c26
a28
c28
a30
c30
a32
c32
Output relay 05
Output relay 06
Output relay 07
Output relay 08
Output relay 09
Output relay 10
Output relay 11
Output relay 12
Output relay 13
Output relay 14
Output relay 15
Output relay 16
26
a02
c02
a04
c04
a06
c06
a08
c08
a10
c10
a12
c12
a14
c14
a16
c16
a18
c18
a20
c20
a22
c22
a24
c24
a26
c26
a28
c28
a30
c30
a32
c32
Note:
1) Alternative Ethernet ports for
station communication are 2 ST
optical fiber ports, shown as
following,
Ethernet Port 1 - ST
Ethernet Port 2 - ST
Connection
CSC-121
X6
a02
c02
a04
c04
a06
c06
a08
c08
a10
c10
a12
c12
a14
c14
a16
c16
a18
c18
a20
c20
a22
c22
a24
c24
a26
c26
a28
c28
a30
c30
a32
c32
X8
a02
c02
a04
c04
a06
c06
a08
c08
a10
c10
a12
c12
a14
c14
a16
c16
a18
c18
a20
c20
a22
c22
a24
c24
a26
c26
a28
c28
a30
c30
a32
c32
Output relay 01
Output relay 01
Output relay 02
Output relay 02
Output relay 03
Output relay 04
Output relay 03
Output relay 05
Output relay 07
Output relay 04
Output relay 05
Output relay 06
Output relay 07
Output relay 08
Output relay 08
Output relay 09
Output relay 09
Output relay 10
Output relay 10
Output relay 11
Output relay 11
Output relay 12
Output relay 12
Output relay 13
Output relay 13
Output relay 14
Output relay 14
Output relay 15
Output relay 15
Output relay 16
Output relay 16
Output relay 06
X9
X7
a02
c02
a04
c04
a06
c06
a08
c08
a10
c10
a12
c12
a14
c14
a16
c16
a18
c18
a20
c20
a22
c22
a24
c24
a26
c26
a28
c28
a30
c30
a32
c32
1)
Output relay 01
Output relay 02
Output relay 03
Output relay 04
Output relay 05
Output relay 06
Output relay 07
Output relay 08
Output relay 09
Output relay 10
Output relay 11
Output relay 12
Output relay 13
Output relay 14
Output relay 15
Output relay 16
27
a02
c02
a04
c04
a06
c06
a08
c08
a10
c10
a12
c12
a14
c14
a16
c16
a18
c18
a20
c20
a22
c22
a24
c24
a26
c26
a28
c28
a30
c30
a32
c32
Note :
1) X9 is optional terminal
set, for additional binary
output module ordered by
user.
Connection
CSC-121
X10
DC 24V + output
Null
Null
DC 24V - output
Power failure alarm relay 1
Power failure alarm relay 2
Null
Null
AUX DC + input
Null
Null
AUX DC - input
Null
Null
Terminal for earthing
Terminal for earthing
28
a02
c02
a04
c04
a06
c06
a08
c08
a10
c10
a12
c12
a14
c14
a16
c16
a18
c18
a20
c20
a22
c22
a24
c24
a26
c26
a28
c28
a30
c30
a32
c32
Connection
B. Typical analogue inputs connection for line
A
B
C
Protection IED
a01
b01
IA
a02
b02
*
*
*
IB
a03
b03
IC
a04
b04
a12
a11
b11
b12
IN
UA
UB
UC
UN
a10
b10
29
U4
Connection
C. Typical analogue inputs connection for transformer
A
B
C
Protection IED
a12
a11
b11
b12
UA
UB
UC
UN
a01
b01
IA
a02
b02
*
*
*
IB
a03
b03
IC
a04
b04
IN
*
A B C
b05
I5
a05
A
B
C
30
Connection
D. Typical analogue inputs connection for sensitive earth fault
protection
A
B
C
Protection IED
a01
b01
IA
a02
b02
*
*
*
IB
a03
b03
IC
a04
b04
a12
a11
b11
b12
*
IN
UA
UB
UC
UN
b05
I5
a05
31
Technical data
Frequency
Item
Standard
Rated system frequency
IEC 60255-1
Data
50 Hz or 60Hz
Internal current transformer
Item
Standard
Rated current Ir
IEC 60255-1
Data
1 or 5 A
Nominal current range
0.05 Ir to 30 Ir
Nominal current range of sensitive
0.005 to 1 A
CT
≤ 0.1 VA at Ir = 1 A;
Power consumption (per phase)
≤ 0.5 VA at Ir = 5 A
≤ 0.5 VA for sensitive CT
Thermal overload capability
IEC 60255-1
100 Ir for 1 s
IEC 60255-27
4 Ir continuous
Internal voltage transformer
Item
Standard
Rated voltage Vr (ph-ph)
IEC 60255-1
Data
100 V /110 V
Nominal range (ph-e)
0.4 V to 120 V
Power consumption at Vr = 110 V
IEC 60255-27
≤ 0.1 VA per phase
DL/T 478-2001
Thermal
overload
capability
(phase-neutral voltage)
IEC 60255-27
2 Vr, for 10s
DL/T 478-2001
1.5 Vr, continuous
Auxiliary voltage
Item
Standard
Data
Rated auxiliary voltage Uaux
IEC60255-1
110 to 250V DC
Permissible tolerance
IEC60255-1
±%20 Uaux
Power consumption at quiescent
IEC60255-1
≤ 50 W per power supply module
IEC60255-1
≤ 60 W per power supply module
state
Power consumption at maximum
load
32
Technical data
Inrush Current
T ≤ 10 ms/I≤ 25 A per power supply
IEC60255-1
module,
Binary inputs
Item
Input voltage range
Standard
IEC60255-1
Data
110/125 V DC
220/250 V DC
Threshold1: guarantee
IEC60255-1
154V, for 220/250V DC
operation
77V, for 110V/125V DC
Threshold2: uncertain operation
IEC60255-1
132V, for 220/250V DC;
66V, for 110V/125V DC
Response time/reset time
IEC60255-1
Software
provides
de-bounce
time
Power consumption, energized
IEC60255-1
Max. 0.5 W/input, 110V DC
Max. 1 W/input, 220V DC
Binary outputs
Item
Standard
Data
Max. system voltage
IEC60255-1
250V DC/AC
Current carrying capacity
IEC60255-1
5 A continuous,
30A，200ms ON, 15s OFF
Making capacity
IEC60255-1
1100 W(DC) at inductive load with
L/R>40 ms
1000 VA(AC)
Breaking capacity
IEC60255-1
220VDC, 0.15A, at L/R≤40 ms
110VDC, 0.30A, at L/R≤40 ms
Mechanical endurance, Unloaded
IEC60255-1
50,000,000 cycles (3 Hz switching
frequency)
Mechanical endurance, making
IEC60255-1
≥1000 cycles
Mechanical endurance, breaking
IEC60255-1
≥1000 cycles
Specification state verification
IEC60255-1
UL/CSA、TŰV
IEC60255-23
IEC61810-1
33
Technical data
Contact circuit resistance
IEC60255-1
measurement
IEC60255-23
30mΩ
IEC61810-1
Open Contact insulation test (AC
IEC60255-1
Dielectric strength)
IEC60255-27
Maximum temperature of parts and
IEC60255-1
AC1000V 1min
55℃
materials
Front communication port
Item
Data
Number
1
Connection
Isolated, RS232; front panel,
9-pin subminiature connector, for software tools
Communication speed
9600 baud
Max. length of communication cable
15 m
RS485 communication port
Item
Data
Number
0 to 2
Connection
2-wire connector
Rear port in communication module
Max. length of communication cable
1.0 km
Test voltage
500 V AC against earth
For IEC 60870-5-103 protocol
Communication speed
Factory setting 9600 baud,
Min. 1200 baud, Max. 19200 baud
Ethernet communication port
Item
Data
Electrical communication port
Number
0 to 3
Connection
RJ45 connector
Rear port in communication module
Max. length of communication cable
100m
For IEC 61850 protocol
34
Technical data
Communication speed
100 Mbit/s
For IEC 60870-5-103 protocol
Communication speed
100 Mbit/s
Optical communication port ( optional )
Number
0 to 2
Connection
SC connector
Rear port in communication module
Optical cable type
Multi-mode
Max. length of communication cable
2.0km
IEC 61850 protocol
Communication speed
100 Mbit/s
IEC 60870-5-103 protocol
Communication speed
100 Mbit/s
Time synchronization
Item
Data
Mode
Pulse mode
IRIG-B signal format
IRIG-B000
Connection
2-wire connector
Rear port in communication module
Voltage levels
differential input
Environmental influence
Item
Recommended permanent operating temperature
Data
-10 °C to +55°C
(Legibility of display may be impaired above
+55 °C /+131 °F)
Storage and transport temperature limit
-25°C to +70°C
Permissible humidity
95 % of relative humidity
IED design
Item
Data
Case size
4U×19inch
Weight
≤ 10kg
35
Technical data
Product safety-related Tests
Item
Standard
Data
Over voltage category
IEC60255-27
Category III
Pollution degree
IEC60255-27
Degree 2
Insulation
IEC60255-27
Basic insulation
Degree of protection (IP)
IEC60255-27
Front plate: IP40
IEC 60529
Rear, side, top and bottom: IP 30
IEC 60255-5
2KV, 50Hz
EN 60255-5
2.8kV DC
ANSI C37.90
between the following circuits:
GB/T 15145-2001
 auxiliary power supply
DL/T 478-2001
 CT / VT inputs
Power
frequency
withstand test
high
voltage
 binary inputs
 binary outputs
 case earth
500V, 50Hz
between the following circuits:
 Communication ports to case
earth
 time synchronization terminals
to case earth
Impulse voltage test
IEC60255-5
5kV (1.2/50μs, 0.5J)
IEC 60255-27
If Ui≥63V
EN 60255-5
1kV if Ui<63V
ANSI C37.90
Tested between the following
GB/T 15145-2001
circuits:
DL/T 478-2001
 auxiliary power supply
 CT / VT inputs
 binary inputs
 binary outputs
 case earth
Note: Ui: Rated voltage
Insulation resistance
IEC60255-5
IEC 60255-27
EN 60255-5
ANSI C37.90
GB/T 15145-2001
36
≥ 100 MΩ at 500 VDC
Technical data
DL/T 478-2001
Protective bonding resistance
IEC60255-27
≤ 0.1Ω
Fire withstand/flammability
IEC60255-27
Class V2
Electromagnetic immunity tests
Item
1 MHz burst immunity test
Standard
Data
IEC60255-22-1
Class III
IEC60255-26
2.5 kV CM ; 1 kV DM
IEC61000-4-18
Tested on the following circuits:
EN 60255-22-1
 auxiliary power supply
ANSI/IEEE C37.90.1
 CT / VT inputs
 binary inputs
 binary outputs
1 kV CM ; 0 kV DM
Tested on the following circuits:
 communication ports
Electrostatic discharge
IEC 60255-22-2
Level 4
IEC 61000-4-2
8 kV contact discharge;
EN 60255-22-2
15 kV air gap discharge;
both polarities; 150 pF; Ri = 330 Ω
Radiated electromagnetic field
IEC 60255-22-3
Frequency sweep:
disturbance test
EN 60255-22-3
80 MHz – 1 GHz; 1.4 GHz – 2.7 GHz
spot frequencies:
80 MHz; 160 MHz; 380 MHz; 450
MHz; 900 MHz; 1850 MHz; 2150
MHz
10 V/m
AM, 80%, 1 kHz
Radiated electromagnetic field
IEC 60255-22-3
Pulse-modulated
disturbance test
EN 60255-22-3
10 V/m, 900 MHz; repetition rate
200 Hz, on duration 50 %
Electric fast transient/burst immunity
IEC 60255-22-4,
Class A, 4KV
test
IEC 61000-4-4
Tested on the following circuits:
EN 60255-22-4
 auxiliary power supply
ANSI/IEEE C37.90.1
 CT / VT inputs
 binary inputs
 binary outputs
37
Technical data
Class A, 1KV
Tested on the following circuits:
 communication ports
Surge immunity test
IEC 60255-22-5
4.0kV L-E
IEC 61000-4-5
2.0kV L-L
Tested on the following circuits:
 auxiliary power supply
 CT / VT inputs
 binary inputs
 binary outputs
500V L-E
Tested on the following circuits:
 communication ports
Conduct immunity test
IEC 60255-22-6
Frequency sweep: 150 kHz – 80
IEC 61000-4-6
MHz
spot frequencies: 27 MHz and 68
MHz
10 V
AM, 80%, 1 kHz
Power frequency immunity test
IEC60255-22-7
Class A
300 V CM
150 V DM
Power frequency magnetic field test
IEC 61000-4-8
Level 4
30 A/m cont. / 300 A/m 1 s to 3 s
100 kHz burst immunity test
IEC61000-4-18
2.5 kV CM ; 1 kV DM
Tested on the following circuits:
 auxiliary power supply
 CT / VT inputs
 binary inputs
 binary outputs
1 kV CM ; 0 kV DM
Tested on the following circuits:
 communication ports
DC voltage interruption test
Item
DC voltage dips
Standard
IEC 60255-11
38
Data
100% reduction 20 ms
Technical data
60% reduction 200 ms
30% reduction 500 ms
DC voltage interruptions
IEC 60255-11
100% reduction 5 s
DC voltage ripple
IEC 60255-11
15%, twice rated frequency
DC voltage gradual shut–down
IEC 60255-11
60 s shut down ramp
/start-up
5 min power off
60 s start-up ramp
DC voltage reverse polarity
IEC 60255-11
1 min
Electromagnetic emission test
Item
Standard
Radiated emission
Data
IEC60255-25
30MHz to 1GHz ( IT device may up
EN60255-25
to 5 GHz)
CISPR22
Conducted emission
IEC60255-25
0.15MHz to 30MHz
EN60255-25
CISPR22
Mechanical tests
Item
Sinusoidal
Vibration
Standard
response
test
Data
IEC60255-21-1
Class 1
EN 60255-21-1
10 Hz to 60 Hz: 0.075 mm
60 Hz to 150 Hz: 1 g
1 sweep cycle in each axis
Relay energized
Sinusoidal Vibration endurance
IEC60255-21-1
Class 1
test
EN 60255-21-1
10 Hz to 150 Hz: 1 g
20 sweep cycle in each axis
Relay non-energized
Shock response test
IEC60255-21-2
Class 1
EN 60255-21-2
5 g, 11 ms duration
3 shocks in both directions of 3 axes
Relay energized
Shock withstand test
IEC60255-21-2
Class 1
EN 60255-21-2
15 g, 11 ms duration
3 shocks in both directions of 3 axes
39
Technical data
Relay non-energized
Bump test
IEC60255-21-2
Class 1
10 g, 16 ms duration
1000 shocks in both directions of 3
axes
Relay non-energized
Seismic test
IEC60255-21-3
Class 1
X-axis 1 Hz to 8/9 Hz: 7.5 mm
X-axis 8/9 Hz to 35 Hz :2 g
Y-axis 1 Hz to 8/9 Hz: 3.75 mm
Y-axis 8/9 Hz to 35 Hz :1 g
1 sweep cycle in each axis,
Relay energized
Climatic tests
Item
Standard
Cold test - Operation
IEC60255-27
Data
-10°C, 16 hours, rated load
IEC60068-2-1
Cold test – Storage
IEC60255-27 IEC60068-2-1
-25°C, 16 hours
Dry heat test – Operation
[IEC60255-27
+55°C, 16 hours, rated load
IEC60068-2-2
Dry heat test – Storage
IEC60255-27
+70°C, 16 hours
IEC60068-2-2
Change of temperature
Damp heat static test
IEC60255-27
Test Nb, figure 2, 5 cycles
IEC60068-2-14
-10°C / +55°C
IEC60255-27
+40°C, 93% r.h. 10 days, rated load
IEC60068-2-78
Damp heat cyclic test
IEC60255-27
+55°C, 93% r.h. 6 cycles, rated load
IEC60068-2-30
CE Certificate
Item
EMC Directive
Low voltage directive
Data
EN 61000-6-2 and EN61000-6-4 (EMC Council
Directive 2004/108/EC)
EN 60255-27 (Low-voltage directive 2006/95 EC).
40
Technical data
Functions
NOTE:
Ir: CT rated secondary current, 1A or 5A;
Overcurrent protection (ANSI 50, 51, 67)
Item
Rang or Value
Tolerance
Definite time characteristics
Current
0.08 Ir to 20.00 Ir
≤ ±3% setting or ±0.02Ir
Time delay
0.00 to 60.00s, step 0.01s
≤ ±1% setting or +40ms, at 200%
operating setting
Reset time
approx. 40ms
Reset ratio
Approx. 0.95 at I/In ≥ 0.5
Inverse time characteristics
Current
0.08 Ir to 20.00 Ir
≤ ±3% setting or ±0.02Ir
IEC standard
Normal inverse;
≤ ±5% setting + 40ms, at 2
Very inverse;
<I/ISETTING < 20, in accordance
Extremely inverse;
with IEC60255-151
Long inverse
ANSI
Inverse;
≤ ±5% setting + 40ms, at 2
Short inverse;
<I/ISETTING < 20, in
Long inverse;
accordance with ANSI/IEEE
Moderately inverse;
C37.112,
Very inverse;
Extremely inverse;
Definite inverse
user-defined characteristic
≤ ±5% setting + 40ms, at 2
T=
<I/ISETTING < 20, in accordance
with IEC60255-151
Time factor of inverse time, A
0.005 to 200.0s, step 0.001s
Delay of inverse time, B
0.000 to 60.00s, step 0.01s
Index of inverse time, P
0.005 to 10.00, step 0.005
set time Multiplier for step n: k
0.05 to 999.0, step 0.01
Minimum operating time
20ms
Maximum operating time
100s
Reset mode
instantaneous
Reset time
approx. 40ms,
Directional element
≤ ±3°, at phase to phase
Operating area range
41
Technical data
Characteristic angle
0°to 90°, step 1°
voltage >1V
Earth fault protection (ANSI 50N, 51N, 67N)
Item
Rang or value
Tolerance
Definite time characteristic
Current
0.08 Ir to 20.00 Ir
≤ ±3% setting or ±0.02Ir
Time delay
0.00 to 60.00s, step 0.01s
≤ ±1% setting or +40ms, at 200%
operating setting
Reset time
approx. 40ms
Reset ratio
Approx. 0.95 at I/Ir ≥ 0.5
Inverse time characteristics
Current
0.08 Ir to 20.00 Ir
≤ ±3% setting or ±0.02Ir
IEC standard
Normal inverse;
IEC60255-151
Very inverse;
≤ ±5% setting + 40ms, at 2
Extremely inverse;
<I/ISETTING < 20
Long inverse
ANSI
Inverse;
ANSI/IEEE C37.112,
Short inverse;
≤ ±5% setting + 40ms, at 2
Long inverse;
<I/ISETTING < 20
Moderately inverse;
Very inverse;
Extremely inverse;
Definite inverse
user-defined characteristic
IEC60255-151
T=
≤ ±5% setting + 40ms, at 2
<I/ISETTING < 20
Time factor of inverse time, A
0.005 to 200.0s, step
0.001s
Delay of inverse time, B
0.000 to 60.00s, step 0.01s
Index of inverse time, P
0.005 to 10.00, step 0.005
set time Multiplier for step n: k
0.05 to 999.0, step 0.01
Minimum operating time
20ms
Maximum operating time
100s
Reset mode
instantaneous
Reset time
approx. 40ms
Directional element
≤ ±3°, at 3U0≥1V
Operating area range of zero
sequence directional element
Characteristic angle
0°to 90°, step 1°
42
Technical data
≤ ±3°, at 3U2≥2V
Operating area range of negative
sequence directional element
Characteristic angle
50°to 90°, step 1°
Neutral earth fault protection (50G, 51G, 67G)
Item
Rang or value
Tolerance
Definite time characteristic
Current
0.08 Ir to 20.00 Ir
≤ ±3% setting or ±0.02Ir
Time delay
0.00 to 60.00s, step 0.01s
≤ ±1% setting or +40ms, at 200%
operating setting
Reset time
approx. 40ms
Reset ratio
Approx. 0.95 at I/Ir ≥ 0.5
Inverse time characteristics
Current
0.08 Ir to 20.00 Ir
≤ ±3% setting or ±0.02Ir
IEC standard
Normal inverse;
≤ ±5% setting + 40ms, at 2
Very inverse;
<I/ISETTING < 20, in accordance with
Extremely inverse;
IEC60255-151
Long inverse
ANSI
Inverse;
≤ ±5% setting + 40ms, at 2
Short inverse;
<I/ISETTING < 20, in accordance
Long inverse;
with ANSI/IEEE C37.112,
Moderately inverse;
Very inverse;
Extremely inverse;
Definite inverse
user-defined characteristic
≤ ±5% setting + 40ms, at 2
T=
<I/ISETTING < 20, in accordance with
IEC60255-151
Time factor of inverse time, A
0.005 to 200.0s, step
0.001s
Delay of inverse time, B
0.000 to 60.00s, step 0.01s
Index of inverse time, P
0.005 to 10.00, step 0.005
set time Multiplier for step n: k
0.05 to 999.0, step 0.01
Minimum operating time
20ms
Maximum operating time
100s
Reset mode
instantaneous
Reset time
approx. 40ms
Directional element
≤ ±3°, at 3U0≥1V
Operating area range
43
Technical data
Characteristic angle
0°to 90°, step 1°
≤ ±3°, at 3U2≥2V
Operating area range
Characteristic angle
0°to 90°, step 1°
Sensitive/neutral earth fault protection (ANSI 50Ns, 51Ns, 67Ns)
Item
Range or value
Tolerance
Definite time characteristic
Current from sensitive CT input
0.005 to 1.000 A , step 0.001 A
≤ ±3 % setting value or 1 mA
Current from neutral CT input
0.08 Ir to 20.00 Ir
≤ ±3 % setting value or 0.02 Ir
Time delay
0.00 to 60.00, step 0.01 s
≤ ±1.5 % setting value or +40
ms, at 200% operating setting
Reset ratio
Approx. 0.95 when I/In ≥ 0.5
Reset time
Approx. 40 ms
Inverse time characteristics
Current from sensitive input
0.005 to 1.000 A , step 0.001 A
≤ ±3 % setting value or 1 mA
Current from normal input
0.08 Ir to 20.00 Ir
≤ ±3 % setting value or 0.02 Ir
IEC standard
Normal inverse;
≤ ±5% setting + 40ms, at 2
Very inverse;
<I/ISETTING < 20, in accordance
Extremely inverse;
with IEC60255-151
Long inverse
ANSI
Inverse;
≤ ±5% setting + 40ms, at 2
Short inverse;
<I/ISETTING < 20, in
Long inverse;
accordance with ANSI/IEEE
Moderately inverse;
C37.112,
Very inverse;
Extremely inverse;
Definite inverse
≤ ±5% setting + 40ms, at 2
user-defined characteristic
T=
<I/ISETTING < 20, in accordance
with IEC60255-151
Time factor of inverse time, A
0.005 to 200.0s, step 0.001s
Delay of inverse time, B
0.000 to 60.00s, step 0.01s
Index of inverse time, P
0.005 to 10.00, step 0.005
set time Multiplier for step n: k
0.05 to 999.0, step 0.01
Minimum operating time
20ms
Maximum operating time
100s
Reset mode
instantaneous
Reset time
approx. 40ms
Directional element for sensitive earth-fault protection
44
Technical data
I cos Φ
principles
Φ (V0 / I0)”
Direction measurement
IE and VE measured
or 3V0 calculated
3U0 Minimum voltage threshold
2.00 to 100.00 V, step 0.01 V
≤ ±3 % setting for measured
voltage;
≤ ±5 % setting for calculated
voltage
Characteristic angle Φ_SEFChar
0.0°to 90.0°, step 1°
≤ ±3°
≤ ±3°
Operating area range
Negative sequence overcurrent protection (ANSI 46)
Item
Rang or Value
Tolerance
Definite time characteristic
Current
0.08 Ir to 20.00 Ir
≤ ±3% setting value or ±0.02Ir
Time delay
0.00 to 60.00, step 0.01 s
≤ ±1% setting or +40ms, at
200% operating setting
Reset time
≤ 40 ms
Reset ratio
Approx. 0.95 for I2 /Ir > 0.5
Inverse time characteristics
Current
0.08 Ir to 20.00 Ir
≤ ±3% setting or ±0.02Ir
IEC standard
Normal inverse;
≤ ±5% setting + 40ms, at 2
Very inverse;
<I/ISETTING < 20, in accordance
Extremely inverse;
with IEC60255-151
Long inverse
ANSI
Inverse;
≤ ±5% setting + 40ms, at 2
Short inverse;
<I/ISETTING < 20, in
Long inverse;
accordance with ANSI/IEEE
Moderately inverse;
C37.112,
Very inverse;
Extremely inverse;
Definite inverse
user-defined characteristic
≤ ±5% setting + 40ms, at 2
T=
<I/ISETTING < 20, in accordance
with IEC60255-151
Time factor of inverse time, A
0.005 to 200.0s, step 0.001s
Delay of inverse time, B
0.000 to 60.00s, step 0.01s
Index of inverse time, P
0.005 to 10.00, step 0.005
set time Multiplier for step n: k
0.05 to 999.0, step 0.01
45
Technical data
Minimum operating time
20ms
Maximum operating time
100s
Reset time
approx. 40ms
Inrush restraint function
Item
Upper function limit
Range or value
0.25 Ir to 20.00 Ir
Tolerance
≤ ±3% setting value or ±0.02Ir
Max current for inrush restraint
Ratio of 2
nd
harmonic current to
0.10 to 0.45, step 0.01
fundamental component current
Cross-block (IL1, IL2, IL3)
0.00s to 60.00 s, step 0.01s
≤ ±1% setting or +40ms
(settable time)
Thermal overload protection (ANSI-49)
Item
Rang or Value
Current
0.1 Ir to 5.00 Ir
Thermal heating time constant
1 to 9999 s
Thermal cooling time constant
1 to 9999 s
Tolerance
≤ ±3% setting or ±0.02Ir
IEC cold curve
 I eq2 
t   ln  2
2 
 I eq  I  
IEC 60255–8,
≤ ±5% setting or +40ms
IEC hot curve
2
 I eq
 I P2 
t   ln 2
2
 I eq  I  
IEC 60255–8,
≤ ±5% setting or +40ms
Breaker failure protection (ANSI 50 BF)
Item
Rang or Value
Tolerance
0.08 Ir to 20.00 Ir
≤ ±3% setting or ±0.02Ir
Time delay of stage 1
0.00s to 32.00 s, step 0.01s
≤ ±1% setting or +25 ms, at
Time delay of stage 2
0.00s to 32.00 s, step 0.01s
200% operating setting
Reset time of stage 1
< 20ms
phase current
Negative sequence current
zero sequence current
46
Technical data
Dead zone protection (ANSI 50DZ)
Item
Rang or Value
Tolerance
Current
0.08 Ir to 20.00 Ir
≤ ±3% setting or ±0.02Ir
Time delay
0.00s to 32.00s, step 0.01s
≤ ±1% setting or +40 ms, at
200% operating setting
Pole discordance protection (ANSI 50PD)
Item
Rang or Value
Tolerance
Current
0.08 Ir to 20.00 Ir
≤ ±3% setting or ±0.02Ir
Time delay
0.00s to 60.00s, step 0.01s
≤ ±1% setting or +40 ms, at
200% operating setting
STUB protection (ANSI 50STUB)
Item
Rang or Value
Tolerance
Current
0.08 Ir to 20.00 Ir
≤ ±3% setting or ±0.02Ir
Time delay
0.00s to 60.00s, step 0.01s
≤ ±1% setting or +40 ms, at
200% operating setting
Undervoltage protection (ANSI 27)
Item
Voltage connection
Rang or Value
Phase-to-phase voltages or
Tolerance
≤ ±3 % setting or ±1 V
phase-to-earth voltages
Phase to earth voltage
5 to 75 V , step 1 V
≤ ±3 % setting or ±1 V
Phase to phase voltage
10 to 150 V, step 1 V
≤ ±3 % setting or ±1 V
Reset ratio
1.01 to 2.00, step 0.01
≤ ±3 % setting
Time delay
0.00 to 120.00 s, step 0.01 s
≤ ±1 % setting or +50 ms, at 80%
operating setting
Current criteria
0.08 to 2.00 Ir
Reset time
≤ 50 ms
≤ ±3% setting or ±0.02Ir
Overvoltage protection (ANSI 59)
Item
Voltage connection
Rang or Value
Phase-to-phase voltages or
47
Tolerance
≤ ±3 % setting or ±1 V
Technical data
phase-to-earth voltages
Phase to earth voltage
40 to 100 V, step 1 V
≤ ±3 % setting or ±1 V
Phase to phase voltage
80 to 200 V, step 1 V
≤ ±3 % setting or ±1 V
Reset ratio
0.90 to 0.99, step 0.01
≤ ±3 % setting
Time delay
0.00 to 60.00 s, step 0.01s
≤ ±1 % setting or +50 ms, at
120% operating setting
Reset time
<40ms
Voltage displacement protection (ANSI 64)
Item
Rang or Value
Pickup threshold 3V0
Tolerance
2 to 100 V, step 1 V
≤ ± 5 % setting value or ±1 V
0.00 to 60.00 s, step 0.01s
≤ ±1 % setting or +50 ms, at
(calculated)
Time delay
120% operating setting
Reset ratio
Approx. 0.95
Synchro-check and voltage check (ANSI 25)
Item
Rang or Value
Tolerance
Synchronization check:
Operating mode

Synch-check

Energizing check, and
synch-check if energizing
check failure

Override
Energizing check:

Dead V4 and dead V3Ph

Dead V4 and live V3Ph

Live V4 and dead V3Ph
Voltage threshold of dead line or
10 to 50 V (phase to earth), step
bus
1V
Voltage threshold of live line or
30 to 65 V (phase to earth), step
bus
1V
∆V-measurement
Voltage
difference
Δf-measurement
1 to 40 V (phase-to-earth), steps
≤ ± 3 % setting or 1 V
≤ ± 3 % setting or 1 V
≤ ± 1V
1V
(f2>f1; f2<f1)
Δα-measurement (α2>α1;
0.02 to 2.00 Hz, step, 0.01 Hz,
≤ ± 20 mHz
1 °to 80 °, step, 1 °
≤ ± 3°
α2<α1)
48
Technical data
Minimum measuring time
0.05 to 60.00 s, step,0.01 s,
≤ ± 1.5 % setting value or +60
ms
Maximum synch-check
0.05 to 60.00 s, step,0.01 s,
≤ ± 1 % setting value or +50 ms
extension time
Auto-Reclosing (ANSI 79)
Item
Number of reclosing shots
Rang or Value
Tolerance
Up to 4
Shot 1 to 4 is individually
selectable
AR initiating functions
Internal protection functions
External binary input
Dead time, separated setting for
0.05 s to 60.00 s, step 0.01 s
≤ ± 1 % setting value or +50 ms
shots 1 to 4
Reclaim time
0.50 s to 60.00s, step 0.01 s
Blocking duration time (AR reset
0.05 s to 60.00s, step 0.01 s
time)
Circuit breaker ready supervision
0.50 s to 60.00 s, step 0.01 s
time
Dead time extension for
0.05 s to 60.00 s, step 0.01 s
synch-check (Max. SYNT EXT)
VT secondary circuit supervision (97FF)
Item
Range or value
Tolerances
Minimum current
0.08Ir to 0.20Ir, step 0.01A
≤ ±3% setting or ±0.02Ir
Minimum zero or negative
0.08Ir to 0.20Ir, step 0.01A
≤ ±5% setting or ±0.02Ir
Maximum phase to earth voltage
7.0V to 20.0V, step 0.01V
≤ ±3% setting or ±1 V
Maximum phase to phase
10.0V to 30.0V, step 0.01V
≤ ±3% setting or ±1 V
40.0V to 65.0V, step 0.01V
≤ ±3% setting or ±1 V
sequence current
voltage
Normal phase to earth voltage
49
Ordering
Pre-configure scheme
Pre-configure scheme
M01
M02
M03
M04
M05
Full
TB
LB
B
B
Overcurrent protection (50, 51, 67)
1
1
1
Earth fault protection (50N, 51N, 67N)
1
1
1
1
1
1
Negative-sequence overcurrent protection (46)
1
1
Thermal overload protection (49)
1
1
1
Overload protection (50OL)
1
1
1
1
1
Overvoltage protection (59)
1
1
1
Under voltage protection (27)
1
1
1
Voltage displacement voltage protection (64)
1
1
Breaker failure protection (50BF)
1
1
1
1
1
Dead zone protection (50DZ)
1
1
1
1
1
STUB protection (50 STUB)
1
1
1
1
1
Poles discordance protection (50PD)
1
1
1
1
1
Synchro-check and energizing check (25)
1
1
Auto-reclosing (79)
1
1
Single- and/or three-pole tripping(94)
1
1
1
1
1
CT secondary circuit supervision
1
1
1
1
1
VT secondary circuit supervision (97FF)
1
1
Analogue input module (5I + 4U)
1
1
1
1
1
CPU module
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
1
2
2
2
2
1
Application
(N1)
Neutral earth fault protection(50G, 51G, 67G) or
sensitive earth-fault protection (50Ns, 51Ns, 67Ns)
1
Communication module (with Ethernet interfaces,
RS485 interfaces and time synchronizing interface)
Binary input module (30 BI)
Binary output modules (16 relays for tripping and
initiation)
Binary output modules (16 relays for signal)
50
Ordering
Power supply module
1
1
1
1
1
Programmable LEDs
18
18
18
18
18
Case, 4U,19”
1
1
1
1
1
NOTE:
n : Quantity of standard function or standard hardware, n= 1, 2, ….;
(n) : Quantity of optional function or optional hardware, n= 1, 2, ….;
N1: Application:
Full-– Full functions version;
TB-– For transformer backup protection
LB-– For line backup protection
B – For breaker protection
51
Ordering
Ordering code
No.1~16
C S C 1 2 1 -
No.17~36
L
F
T
Pre-configure scheme
Pre-configure scheme code
M
Pre-configure scheme number 1
0~9
Pre-configure scheme number 2
0~9
HMI Language (L) note
English
1
Russian
2
French
Portuguese
3
Spanish
5
4
Rated Frequency (F)
50 Hz
5
60 Hz
6
Station Communication Protocols (T)
Ethernet interface:IEC61850-8; RS485 interface: IEC60870-5-103
1
Ethernet interface:IEC60870-5-103; RS485 interface: IEC60870-5-103
2
Note: Chinese is always offered as default HMI language.
52
Ordering
No.17~22
No.1~16
C S C 1 2 1 -
A
M
No.23~36
C
Slot 1
Analogue Input Module (A)
5I (1A)+4U
5
5I (5A)+4U
6
4I (1A)+ISEF (0.2A)+4U
7
4I (5A)+ISEF (0.2A)+4U
8
Slot 2
CPU Module 1 (M)
Dedicated to CSC121
3
Slot 3
Communication module (C)
3 electrical Ethernet ports, 1 RS485 ports, IRIG-B
1
3 electrical Ethernet ports, 1 RS485 ports, Pulse
2 electrical Ethernet ports, 2 RS485 ports, IRIG-B
2
2 electrical Ethernet ports, 2 RS485 ports, Pulse
2 optical Ethernet ports, 2 RS485 ports, IRIG-B
4
5
2 optical Ethernet ports, 2 RS485 ports, Pulse
6
3
53
Ordering
No.23~30
No.1~22
C S C 1 2 1 -
I
No.31~36
O
Slot 4
Binary Input Module (I)
30BI (220V DC), with startup blocking relay
1
30BI (110V DC), with startup blocking relay
2
Slot 5
Binary Output Module (O)
16 relays for tripping
1
Slot 6
Binary Output Module (O)
16 relays for tripping
1
16 relays (with 19 contacts) for signalling
3
Null
x
Slot 7
Binary Output Module (O)
16 relays for tripping
1
16 relays (with 19 contacts) for signalling
3
Null
x
Slot 8
Binary Output Module (O)
16 relays for tripping
1
16 relays (with 19 contacts) for signalling
3
Null
x
Slot 9
Binary Output Module (O)
16 relays for tripping
1
16 relays (with 19 contacts) for signalling
3
Null
x
54
Ordering
No.31~36
No.1~30
C S C 1 2 1 -
P
K
Z
Slot 10
Power Supply Module (P)
1
110V - 250V DC
Case and Front Plate (K)
Case: 4U, 19'
Front plate: Medium size LCD; 20 LEDs
3
Accessories (Z)
x
Null
55
Address: No.9 Shangdi 4th Street, Haidian District,
Beijing, P.R.C. 100085
Tel: +86 10 62962554, +86 10 62961515 ext.8998
Fax: +86 10 82783625
Email:sf_sales@sf-auto.com
Website: http://www.sf-auto.com