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REX 521

ABB REX 521 Technical Reference Manual, Standard Configurations

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REX 521
Protection Relay
Technical Reference Manual, Standard Configurations
3
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
Issued: 27.6.2001
Version: C/14.08.2002
Checked: ML
Approved: MK
We reserve the right to change data without prior notice.
Contents
1. Safety information ...................................................................11
2. Introduction .............................................................................12
3. Standard configurations .........................................................17
3.1. HW version: Basic .......................................................................17
3.1.1. Standard configuration B01 .............................................17
3.1.1.1. Features .............................................................17
3.1.1.2. Application ..........................................................18
3.1.2. Standard configuration B02 .............................................20
3.1.2.1. Features .............................................................20
3.1.2.2. Application ..........................................................21
3.2. HW version: Medium ...................................................................23
3.2.1. Standard configuration M01 .............................................23
3.2.1.1. Features .............................................................23
3.2.1.2. Application ..........................................................24
3.2.2. Standard configuration M02 .............................................26
3.2.2.1. Features .............................................................26
3.2.2.2. Application ..........................................................27
3.3. HW version: High/Sensors ..........................................................29
3.3.1. Standard configuration H01 (Sensors) .............................29
3.3.1.1. Features .............................................................29
3.3.1.2. Application ..........................................................31
3.3.2. Standard configuration H02 .............................................33
3.3.2.1. Features .............................................................33
3.3.2.2. Application ..........................................................35
3.3.3. Standard configuration H03 .............................................37
3.3.3.1. Features .............................................................37
3.3.3.2. Application ..........................................................39
3.3.4. Standard configuration H04 .............................................41
3.3.4.1. Features .............................................................41
3.3.4.2. Application ..........................................................43
3.3.5. Standard configuration H05 .............................................45
3.3.5.1. Features .............................................................45
3.3.5.2. Application ..........................................................47
3.3.6. Standard configuration H06 .............................................49
3.3.6.1. Features .............................................................49
3.3.6.2. Application ..........................................................51
4. Reading of the overview diagrams of the signal routings ..53
1MRS 751802-MUM
4
1MRS 751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
4.1. Digital inputs ...............................................................................53
4.1.1. Input selectors .................................................................54
4.1.2. Input switchgroups (SWGRP) ..........................................55
4.1.3. Input signals ....................................................................56
4.2. Function blocks in the overview diagrams of the signal routings 56
4.2.1. Function blocks ................................................................57
4.3. Output switchgroups (SWGRP) ..................................................58
4.3.1. Output selectors ..............................................................58
4.4. Other functions described in signal overview diagrams ..............59
4.4.1. Lockout function ..............................................................59
5. Parametrization of the digital inputs .................................... 62
5.1. Selectors .....................................................................................62
5.1.1. Reset ...............................................................................62
5.1.2. Group ...............................................................................62
5.1.3. Blocking ...........................................................................62
5.1.4. Disturbance recorder trigger ............................................62
5.1.5. Power quality trigger ........................................................63
5.1.6. Master trip ........................................................................63
5.1.7. External trip .....................................................................63
5.1.8. Lockout reset ...................................................................63
5.1.9. Local/Remote ..................................................................63
5.1.10.Close enable ....................................................................63
5.1.11.Direct control (Open/Close) .............................................63
5.1.12.Object indication ..............................................................63
5.1.13.Time synchronization .......................................................63
5.1.14.AR inhibit, AR on input, start AR ......................................64
5.1.15.BACTRL (Basic angle control) .........................................64
5.1.16.Logic input 1...3 ...............................................................64
5.2. Interlocking .................................................................................64
5.2.1. Interlocking options ..........................................................64
6. Default settings ...................................................................... 68
7. Function block descriptions ................................................. 74
7.1. Protection ....................................................................................74
7.1.1. 3I>, 3I>> and 3I>>> .........................................................74
7.1.2. Io>, Io>> and Io>>> .........................................................76
7.1.3. Io>->, Io>>-> and Io>>>-> ...............................................78
7.1.4. 3I>-> and 3I>>-> ..............................................................79
7.1.5. 3I2f> .................................................................................84
7.1.6. Iub> ..................................................................................84
7.1.7. 3Ith> .................................................................................85
7.1.8. O->I ..................................................................................86
7.1.9. f1 and f2 ...........................................................................88
1MRS 751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
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7.1.10.SYNC1 .............................................................................89
7.2. Control .........................................................................................90
7.2.1. I<->O CB1 ........................................................................90
7.2.2. I<->O IND1 and I<->O IND2 ............................................91
7.2.3. I<->O POS .......................................................................91
7.3. Measurement ..............................................................................91
7.3.1. 3I ......................................................................................91
7.3.2. Io ......................................................................................92
7.3.3. Uo ....................................................................................92
7.3.4. DREC ...............................................................................93
7.3.5. 3U ....................................................................................95
7.3.6. f ........................................................................................95
7.3.7. PQE .................................................................................95
7.4. Condition monitoring ...................................................................96
7.4.1. CB wear ...........................................................................96
7.4.2. TCS1 ................................................................................96
7.4.3. MCS 3I .............................................................................97
7.4.4. MCS 3U ...........................................................................97
7.5. Power quality ...............................................................................98
7.5.1. PQ 3Inf .............................................................................98
7.5.2. PQ 3Unf ...........................................................................99
7.6. Standard functions ....................................................................100
7.6.1. Switchgroups .................................................................100
7.6.2. Selectors ........................................................................100
8. Example substations ............................................................101
9. Application examples, Basic ................................................104
9.1. Outgoing feeder, Basic B01 ......................................................104
9.1.1. Features .........................................................................104
9.1.2. Measurement connections .............................................106
9.1.3. Protection .......................................................................106
9.1.3.1. Phase overcurrent protection ...........................106
9.1.3.2. Earth-fault protection ........................................107
9.1.3.3. Phase discontinuity protection .........................108
9.1.3.4. Thermal overload protection ............................108
9.1.4. Connections and signal routings ....................................109
9.1.4.1. Protection signal routing ...................................109
9.1.4.2. Indication and control connections ...................111
9.1.5. Implementations .............................................................113
9.1.5.1. Outgoing blocking signal to the incoming
feeder ...............................................................113
9.1.5.2. Blocking signal received from the residual
voltage relay .....................................................114
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1MRS 751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
9.1.5.3. Circuit-breaker failure protection ......................114
9.1.5.4. Trip-circuit supervision .....................................115
9.1.5.5. Condition monitoring of the breaker wear ........115
9.1.5.6. Disconnector and earth-switch indication ........115
9.2. Incoming feeder, Basic B01 ......................................................117
9.2.1. Features ........................................................................117
9.2.2. Measurement connections ............................................119
9.2.3. Protection ......................................................................119
9.2.3.1. Phase overcurrent protection ...........................120
9.2.3.2. Earth-fault protection .......................................121
9.2.3.3. Protection signal routing ..................................121
9.2.3.4. Indication and control connections ..................122
9.2.4. Implementations ............................................................122
9.2.4.1. Blocking signal received from the outgoing
feeder ...............................................................122
9.2.4.2. Outgoing blocking signal to the overcurrent
relay on the HV side ........................................122
9.2.4.3. Earth-fault stage Io>>> to trip the breaker on
the HV side of the transformer .........................123
9.2.4.4. Circuit-breaker failure protection ......................123
9.2.4.5. Disturbance recorder .......................................123
9.2.4.6. Power quality ...................................................124
9.3. Transformer feeder, Basic B01 .................................................126
9.3.1. Features ........................................................................126
9.3.2. Measurement connections ............................................129
9.3.3. Protection ......................................................................129
9.3.3.1. Phase overcurrent protection ...........................129
9.3.3.2. Transformer inrush ..........................................130
9.3.3.3. Protection signal routing ..................................131
9.3.3.4. Indication and control connections ..................131
9.3.4. Implementations ............................................................131
9.3.4.1. Blocking signal from the MV relay on
the secondary side of the transformer .............131
9.3.4.2. Circuit-breaker failure protection ......................132
9.3.5. Blocking signal overview ................................................133
9.4. Outgoing feeder, Basic B02 ......................................................135
9.4.1. Features ........................................................................135
9.4.2. Measurement connections ............................................137
9.4.3. Protection ......................................................................137
9.4.3.1. Auto-reclosure function ....................................137
9.4.4. Protection signal routing ................................................140
9.4.5. Indication and control connections ................................140
9.4.6. Implementations ............................................................141
1MRS 751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
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9.4.6.1. Definite Trip alarm to output relay ....................141
9.4.6.2. Digital input to initiate auto-reclosing function ..142
10.Application examples, Medium ...........................................143
10.1.Outgoing feeder, Medium M01 .................................................143
10.1.1.Features .........................................................................143
10.1.2.Measurement connections .............................................145
10.1.3.Protection .......................................................................145
10.1.3.1.Directional earth-fault protection ......................146
10.1.3.2.Protection signal routing ..................................146
10.1.3.3.Indication and control connections ...................146
10.1.4.Implementations .............................................................147
10.1.4.1.Basic angle control by digital input ...................147
10.1.4.2.Outgoing blocking signal to the incoming
feeder ...............................................................148
10.1.4.3.Trip-alarm signals from overcurrent and
earth-fault .........................................................148
10.1.4.4.Circuit-breaker failure protection ......................148
10.1.4.5.Trip-circuit supervision .....................................149
10.2.Incoming feeder, Medium M01 .................................................150
10.2.1.Features .........................................................................150
10.2.2.Measurement connections .............................................152
10.2.3.Protection .......................................................................152
10.2.3.1.Overcurrent protection .....................................153
10.2.3.2.Residual voltage protection ..............................153
10.2.4.Connections ...................................................................153
10.2.4.1.Protection signal routing ..................................153
10.2.4.2.Indication and control connections ...................153
10.2.5.Implementations .............................................................154
10.2.5.1.Start signal from the second residual voltage
stage to release blocking .................................154
10.2.5.2.Blocking signal received from the outgoing
feeder ...............................................................154
10.2.5.3.Outgoing blocking signal to the overcurrent
relay on the HV side .........................................154
10.2.5.4.Trip signal from second residual voltage stage 155
10.2.5.5.Second settings for residual voltage protection 155
10.2.5.6.Circuit-breaker failure protection ......................155
10.2.5.7.Trip-circuit supervision .....................................156
10.3.Outgoing feeder, Medium M02 .................................................158
10.3.1.Features .........................................................................158
10.3.2.Measurement connections .............................................160
10.3.3.Protection .......................................................................160
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1MRS 751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
10.3.3.1.Auto-reclosure function ....................................160
10.3.4.Protection signal routing ................................................163
10.3.5.Indication and control connections ................................163
10.3.6.Implementations ............................................................164
10.3.6.1.Definite trip alarm to output relay .....................164
10.3.6.2.Digital input to initiate auto-reclosing function .165
10.3.6.3.Basic angle control by digital input ..................165
11.Application examples, High ................................................ 167
11.1.Incoming feeder, High H01 ......................................................167
11.1.1.Features ........................................................................167
11.1.2.Measurements ...............................................................169
11.1.3.Protection ......................................................................169
11.1.3.1.Overcurrent protection .....................................169
11.1.3.2.Synchro-check function ...................................169
11.1.4.Connections ...................................................................170
11.1.4.1.Protection signal routing ..................................170
11.1.4.2.Indication and control connections ..................170
11.1.5.Implementations ............................................................170
11.1.6.Blocking principles .........................................................170
11.1.6.1.Circuit-breaker failure protection ......................171
11.1.6.2.Trip-circuit supervision .....................................171
11.2.Incoming feeder, High H02 ......................................................172
11.2.1.Features ........................................................................172
11.2.2.Measurement connections ............................................174
11.2.3.Protection ......................................................................174
11.2.3.1.Overcurrent protection .....................................174
11.2.4.Connections ...................................................................175
11.2.4.1.Protection signal routing ..................................175
11.2.4.2.Indication and control connections ..................176
11.2.5.Implementations ............................................................176
11.2.5.1.Blocking signal received from the outgoing
feeder and the bus sectionalizer ......................176
11.2.5.2.Blocking signal from I>-> stage to I>> stage ...177
11.2.5.3.Circuit-breaker failure protection ......................177
11.2.5.4.Trip-circuit supervision .....................................178
11.3.Bus sectionalizer, High H03 .....................................................179
11.3.1.Features ........................................................................179
11.3.2.Measurements ...............................................................181
11.3.3.Protection ......................................................................181
11.3.3.1.Overcurrent protection .....................................181
11.3.3.2.Synchro-check function ...................................182
11.3.4.Connections ...................................................................183
1MRS 751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
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11.3.4.1.Protection signal routing ..................................183
11.3.4.2.Indication and control connections ...................183
11.4.Outgoing feeder, High H04 .......................................................184
11.4.1.Features .........................................................................184
11.4.2.Measurements ...............................................................186
11.4.3.Measurement connections .............................................186
11.4.4.Protection .......................................................................186
11.4.4.1.Non-directional earth-fault protection ...............186
11.4.4.2.Auto-reclosure function ....................................187
11.4.5.Connections ...................................................................187
11.4.5.1.Protection signal routing ..................................187
11.4.5.2.Indication and control connections ...................187
11.4.6.Implementations .............................................................187
11.5.Incoming feeder, High H05 .......................................................188
11.5.1.Features .........................................................................188
11.5.2.Measurements ...............................................................190
11.5.3.Protection .......................................................................190
11.5.3.1.Phase overcurrent protection ...........................190
11.5.3.2.Earth-fault protection ........................................190
11.5.3.3.Overvoltage and undervoltage protection ........190
11.5.4.Connections ...................................................................191
11.5.4.1.Protection signal routing ..................................191
11.5.4.2.Indication and control connections ...................192
11.5.5.Implementations .............................................................192
11.5.5.1.Blocking signal received from the outgoing
feeder ...............................................................192
11.5.5.2.Outgoing blocking signal to the overcurrent
relay on the HV side .........................................192
11.5.5.3.Earth-fault stage Io>>> to trip the breaker on
the HV side of the transformer .........................192
11.5.5.4.Circuit-breaker failure protection ......................192
11.5.5.5.Disturbance recorder .......................................192
11.5.5.6.Power quality ...................................................193
11.6.Measurement cubicle, High H06 ..............................................194
11.6.1.Features .........................................................................194
11.6.2.Measurements ...............................................................196
11.6.3.Protection .......................................................................196
11.6.3.1.Residual voltage protection ..............................196
11.6.3.2.Overvoltage and undervoltage protection ........196
11.6.3.3.Underfrequency protection ...............................197
11.6.4.Connections ...................................................................197
11.6.4.1.Protection signal routing ..................................197
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1MRS 751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
11.6.4.2.Indication and control connections ..................198
11.6.5.Implementations ............................................................199
11.6.5.1.Disturbance recorder .......................................199
11.6.5.2.Power quality ...................................................199
12.Symbol notations ................................................................ 201
13.References ........................................................................... 203
5HYLVLRQKLVWRU\
Version C/14.8.2002:
- changes in chapters: “Introduction”, “Local/Remote”, “3I2f>”, “Transformer inrush”, “Default set-
tings”, “3I>, 3I>> and 3I>>>”, “Symbol notations”
- new chapters: “HW version: High”, “3I>-> and 3I>>->”, “3U> and 3U>>”, “3U< and 3U<<”, “Uo>,
Uo>> and Uo>>>”, “f1 and f2”, “SYNC1”, “3U”, “f”, “PQE”, “MCS 3U”, “PQ 3Unf”, “Application
examples: High”
1MRS 751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
11
1. Safety information
Dangerous voltages can occur on the connectors, even though the
auxiliary voltage is disconnected
National and local electrical safety regulations must always be
followed
The device contains components that are sensitive to electrostatic
discharge
The frame of the device has to be carefully earthed
Only a competent electrician is allowed to carry out the electrical
installation
Non-observance can result in death, personal injury or substantial
property damage
Breaking the sealing tape on the rear panel of the device will result in
loss of warranty and a proper operation will no longer be guaranteed
!
12
1MRS 751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
2. Introduction
This document provides descriptions of the standard configurations for
the REX 521. Section 3 describes the features of the different standard
configurations one by one while sections 4 to 6 describe the signal routings and
functionality. Section 8, 9 and 10 present different application examples.
The standard configurations available are presented in the following table. Note that
in the function block descriptions in the CD-ROM Technical Descriptions of
Functions (1MRS 750889-MCD) the FB names are used instead of the IEC names.
Hardware (HW) versions for the REX 521 are basic, medium, high and sensor. The
sensor variant of the standard configuration is indicated as the letter ‘S’ in the
“Config. name” parameter, e.g. H02S.
Differences between the REX 521 and the RED 500 platform in
the function block descriptions
The REX 521 and the RED 500 platform differ in some respects concerning the
function block descriptions in the CD-ROM Technical Descriptions of Functions
(1MRS 750889-MUM). Firstly, there are some terms that refer to other products
than the REX 521. Secondly, there are few characteristics that appear only in the
REX 521:
• Event mask 1 is only for SPA communication.
• The direct control of the auto-reclose function has been disabled.
• Limited number of inputs and outputs are used in standard configurations of the
REX 521.
1MRS 751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
13
Table 2.-1 Standard configurations for the REX 521
HW versions Basic Medium High/Sensor
Standard configurations B01 B02 M01 M02
H01
1
H02 H03 H04 H05 H06
Function
blocks
FB name
IEEE
device
number
Protection
3I>
NOC3Low 51
xxxx xxxxx
3I>>
NOC3High 50/51
xxxx xxxxx
3I>>>
NOC3Inst 50/51
xxxxx xxx
Io>
NEF1Low 51N
xx
x
2
x
Io>>
NEF1High 50N/51N
xx
x
2
x
Io>>>
NEF1Inst 50N
xx
x
2
x
Io>->
4
DEF2Low 67N/51N
xxxxxx
Io>>->
4
DEF2High 67N
xxxxxx
Io>>>->
4
DEF2Inst 67N
xxx xx
3I>->
DOC6Low 67
x
x
3
3I>>->
DOC6High 67
x
x
3
3U>
OV3Low 59
xx
3U>>
OV3High 59
xx
3U<
UV3Low 27
xx
3U<<
UV3High 27
xx
3I2f>
Inrush3 68
xxxxxxxxx
Iub>
CUB3Low 46
xxxxxxxx
3Ith>
TOL3Cab 49F
xxxxxxxx
O->I
AR5Func 79
x xxxxx
Uo>
ROV1Low 59N
xx
Uo>>
ROV1High 59N
xx
Uo>>>
ROV1Inst 59N
xx
f1
Freq1St1 81U/81O
x
f2
Freq1St2 81U/81O
x
SYNC1
SCVCSt1 25
xx
Control
I<->O CB1
COCB1
xxxxxxxxxx
I<->O IND1
COIND1
xxxxxxxxxx
I<->O IND2
COIND2
xxxxxxxxxx
I<->O POS
COLOCAT
xxxxxxxxxx
Measurement
3I
MECU3A
xxxxxxxxxx
Io
MECU1A
xxxxxxxxxx
Uo
MEVO1A
xxxxxxxx
DREC
MEDREC
xxxxxxxxxx
3U
MEVO3A
xxxxxx
f
MEFR1
xxxxxx
PQE
MEPE7
xxxxxx
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1MRS 751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
1
H01 available only with sensor version of the REX 521
2
Configured fixedly to the I
0
(1/5 A) channel
3
3I>-> and 3I>>-> cannot be set to operate as 3I>, 3I>> or 3I>>>
4 Can be used as Io>, Io>> and Io>>> or Uo>, Uo>> and Uo>>> function block with some limitations
Condition
monitoring
CB wear
CMBWEAR1
xxxxxxxxxx
TCS1
CMTCS1
xxxxxxxxxx
MCS 3I
CMCU3
xxxxxxxxxx
MCS 3U
CMVO3
xxxxxx
Power quality
monitoring
PQ 3Inf
PQCU3H
xxxxxxxxxx
PQ 3Unf
PQVO3H
xxxxx
Table 2.-1 Standard configurations for the REX 521
HW versions Basic Medium High/Sensor
Standard configurations B01 B02 M01 M02
H01
1
H02 H03 H04 H05 H06
Function
blocks
FB name
IEEE
device
number
1MRS 751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
15
Table 2.-2 Protection functions available in the different standard
configurations of the REX 521
Function Description
3I> Three-phase non-directional overcurrent protection, low-set stage
3I>> Three-phase non-directional overcurrent protection, high-set stage
3I>>> Three-phase non-directional overcurrent protection, instantaneous stage
Io> Non-directional earth-fault protection, low-set stage
Io>> Non-directional earth-fault protection, high-set stage
Io>>> Non-directional earth-fault protection, instantaneous stage
Io>-> Directional earth-fault protection, low-set stage
Io>>-> Directional earth-fault protection, high-set stage
Io>>>-> Directional earth-fault protection, instantaneous stage
3I>-> Three-phase directional overcurrent protection, low-set stage
3I>>-> Three-phase directional overcurrent protection, high-set stage
3U> Three-phase overvoltage protection, low-set stage
3U>> Three-phase overvoltage protection, high-set stage
3U< Three-phase undervoltage protection, low-set stage
3U<< Three-phase undervoltage protection, high-set stage
3I2f> Three-phase transformer inrush and motor start-up current detector
Iub> Phase discontinuity protection
3Ith> Three-phase thermal protection for cables
O->I Auto-reclose function (5 shots)
Uo> Residual overvoltage protection, low-set stage
Uo>> Residual overvoltage protection, high-set stage
Uo>>> Residual overvoltage protection, instantaneous stage
f1 Underfrequency or overfrequency protection, stage 1
f2 Underfrequency or overfrequency protection, stage 2
SYNC Synchro-check / voltage-check function
Table 2.-3 Control functions available in the different standard configurations
of the REX 521
Function Description
I<->O CB1 Circuit breaker control with indication
I<->O IND1 Object indication
I<->O IND2 Object indication
I<->O POS Logic control position selector
Table 2.-4 Measurement functions available in the different standard
configurations of the REX 521
Function Description
3I Three-phase current measurement
Io Neutral current measurement
Uo Residual voltage measurement
DREC Transient disturbance recorder
3U Three-phase voltage measurement
16
1MRS 751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
f System frequency measurement
PQE Three-phase power and energy measurement
Table 2.-5 Condition monitoring functions available in the different standard
configurations of the REX 521
Function Description
CB wear Circuit breaker electric wear 1
TCS1 Trip-circuit supervision 1
MCS 3I Supervision function of the energizing current input circuit
MCS 3U Supervision function of the energizing voltage input circuit
Table 2.-6 Power quality monitoring function available in the different
standard configurations of the REX 521
Function Description
PQ 3Inf Current waveform distortion measurement
PQ 3Unf Voltage waveform distortion measurement
Table 2.-4 Measurement functions available in the different standard
configurations of the REX 521
Function Description
1MRS 751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
17
3. Standard configurations
3.1. HW version: Basic
3.1.1. Standard configuration B01
3.1.1.1. Features
• Three-phase non-directional overcurrent protection with three stages
• Non-directional earth-fault protection with three stages
• Phase discontinuity protection for three phases
• Three-phase thermal protection for cables
• Three-phase transformer inrush and motor start-up current detector
• Supervision function for the energizing current input circuit
• Current waveform distortion measurement
• Three-phase current measurement
• Neutral current measurement
• Calculation of the accumulated electric breaker wear of the circuit breaker (CB)
• Transient disturbance recorder
• Trip-circuit supervision
• Delayed trip output for the circuit-breaker failure protection (CBFP) function
• Circuit breaker control with indication
• Lockout function
• Object indication
• Logic control position selector
• User-configurable I/Os
• Interlocking
For more information about the features, please refer to chapter “Function block
descriptions” on page 74.
18
1MRS 751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
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3.1.1.2. Application
This standard configuration for the REX 521 is designed to be used in single busbar
systems using one circuit breaker for selective short-circuit, time overcurrent and
earth-fault protection of radial isolated neutral networks, solidly earthed networks,
resistant earthed networks and resonant earthed networks.
For more detailed information, please refer to the application examples of B01 on
pages 104, 117 and 126.
49F
3
3I > 50/51
I >
0
50N/51N
3I >
2f
68
I >
46
CBFP
62
TCS
CBCM
0
I
MCS
3I~harm
000
R
3I
I
0
REX 521 B01
LO
86
1MRS 751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
19
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3I>
BS1
BS2
GROUP
RESET
CBFP
START
TRIP
CBFP
3I>>>
CBFP
BS1
BS2
GROUP
DOUBLE
RESET
BSOUT
START
TRIP
CBFP
Io>
CBFP
BS1
BS2
GROUP
RESET
START
TRIP
CBFP
Io>>
CBFP
BS1
BS2
GROUP
RESET
START
TRIP
CBFP
Io>>>
CBFP
BS1
BS2
GROUP
RESET
START
TRIP
CBFP
GROUP
START
3I
2f
/I
1f
>
3dI/dt>
3I2f>
BS1
BS2
GROUP
RESET
START
TRIP
CBFP
Iub>
CBFP
3∆I>
BLOCK (BS)
GROUP
RESET
START
TRIP
CBFP
CU_ALARM
3Ith>
CBFP
3
ϑ>
Cab
I<->Ο CB1
OPEN
CLOSE
CLOSEENA
BINOPEN
BINCLOSE
OOPEN
OCLOSE
AOPEN
ACLOSE
3I
IL1
IL2
IL3
Io
Io
OPEN
BINOPEN
BINCLOSE
ALARM
CB wear
TCSSTATE
BS
ALARM
TCS1
ALARM
MCS 3I
TRIGG
RESET
HAR_HIGH
CUM_HIGH
PQ 3Inf
3I>>
CBFP
BS1
BS2
GROUP
DOUBLE
RESET
BSOUT
START
TRIP
CBFP
I<->O IND1
BINOPEN
BINCLOSE
I<->O IND2
BINOPEN
BINCLOSE
I<->O POS
BINREMOTE
ConfB01
PO1
(X4.1.12/13)
PO2
(X4.1.14/15)
PO3
(X4.1.17/18)
SO1
(X4.1.8/7/6)
SO2
(X4.1.10/11/9)
3I>
3I>>
3I>>>
Io>
Io>>
Io>>>
Iub>
3Ith>
1
Lockout
Lockout
HSPO1
Lockout reset
S
Q
R
Lockout Working
HSPO1
≥1
Master Trip
Open
Output SWGRP’s Output signals
Output relays
(X4.2.3/4/1/2)
Trip 1
≥1
3I>
3I>>
3I>>>
Io>
Io>>
Io>>>
Iub>
3Ith>
Trip 2
3I>
3I>>
3I>>>
Io>
Io>>
Io>>>
Iub>
3Ith>
Trip 3
3I>
3I>>
3I>>>
Io>
Io>>
Io>>>
Iub>
3Ith>
Start 1
3I>
3I>>
3I>>>
Io>
Io>>
Io>>>
Iub>
3Ith>
Start 2
3I>>
3I>>>
BSOUT
Alarm 1
I<->0 CB1 open
I<->0 CB1 close
3Ith>
3I MCS
TCS
PQ 3Inf har
PQ 3Inf cum
CB wear
Lockout
Close
3I>
3I>>
3I>>>
Io>
Io>>
Io>>>
Iub>
3Ith>
CBFP
3I>>
3I>>>
Double
Function blocks
I<->O CB1
Interlocking_A
Interlocking_B
Interlocking_C
Interlocking_D
Interlocking_E
CLOSEENA
&
Interlocking
scheme
I<->O CB1
Lockout Working
Close
Close enable
CB pos. open
CB pos. close
Open
DC pos. open
DC pos. close
ES pos. open
ES pos. close
Logic input 1
Logic input 2
Logic input 3
Selector
I<->O IND1
DC1
DC2
I<->O IND2
ES1
ES2
DC2
ES2
DC1
ES1
CBO
TCS BS
SWGRP
CBO
Input SWGRP’sInput signals
Digital
inputs
DI1
DI2
DI3
DI4
DI5
DI6
DI7
DI8
DI9
X4.2.5/6
X4.2.6/7
X4.2.8/9
X4.2.9/10
X4.2.11/12
X4.2.13/14
X4.2.15/16
X4.2.17/18
X3.1.1/2
Terminal
connection
O/C
E/F
Iub>
3Ith>
PQ 3Inf
BS2 3I>
BS2 3I>>
BS2 3I>>>
BS2 Io>
BS2 Io>>
BS2 Io>>>
BS2 Iub>
BS 3Ith>
Blocking 2
DREC trig
Master trip
Master trip
Lockout reset
Lockout reset
PQ 3Inf trig
O/C
E/F
Iub>
3Ith>
PQ 3Inf
O/C
E/F
Iub>
3Ith>
Reset 2
SWGRP
Reset 1
Group
Remote
BS1 3I>
BS1 3I>>
BS1 3I>>>
BS1 Io>
BS1 Io>>
BS1 Io>>>
BS1 Iub>
Blocking 1
DREC
IL1
IL2
IL3
Io
Uo
BI1
BI2
BI3
BI4
BI5
BI6
BI7
BI8
BI9
BI10
BI11
BI12
BI13
BI14
BI15
BI16
EXT_TRG
Start 3I>
Start 3I>>
Start 3I>>>
Start Io>
Start Io>>
Start Io>>>
Start 3Iub>
Start 3Ith>
Trip 3I>
Trip 3I>>
Trip 3I>>>
Trip Io>
Trip Io>>
Trip Io>>>
Trip 3Iub>
Trip 3Ith>
I<->0 CB1 open
I<->0 CB1 close
3Ith>
3I MCS
TCS
PQ 3Inf har
PQ 3Inf cum
CB wear
Alarm 2
I<->0 POS
External trip
External trip
External trip
20
1MRS 751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
3.1.2. Standard configuration B02
3.1.2.1. Features
• Three-phase non-directional overcurrent protection with three stages
• Three-phase transformer inrush and motor start-up current detector
• Non-directional earth-fault protection with three stages
• Phase discontinuity protection for three phases
• Three-phase thermal protection for cables
• Supervision function for the energizing current input circuit
• Current waveform distortion measurement
• Three-phase current measurement
• Neutral current measurement
• Calculation of the accumulated electric breaker wear of the circuit breaker (CB)
• Transient disturbance recorder
• Trip-circuit supervision
• Delayed trip output for the circuit-breaker failure protection (CBFP) function
• Automatic reclosing 1...5 shots
• Circuit breaker control with indication
• Lockout function
• Object indication
• Logic control position selector
• User-configurable I/Os
• Interlocking
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49F
3
3I > 50/51
I >
0
50N/51N
3I >
2f
68
I >
46
0
I
79
CBFP
62
TCS
CBCM
3I
I
0
0
I
MCS
3I~harm
000
R
REX 521 B02
LO
86
/