Feeder Protection Relay Product Guide
REX 521
Feeder Protection Relay
REX 521 1MRS752177-MBG Issued: 20.11.2001 Status: Updated Version: H/18.10.2010 Data subject to change without notice
General
The protection relay REX 521 is designed for protection, control, measuring, and supervision in medium voltage networks. Typical applications include incoming and outgoing feeders as well as substation protection. The
protection relay is provided with energizing inputs for conventional current and voltage transformers. Also a hardware version with inputs for current and voltage sensors is available.
Design
The protection relay is based on a multiprocessor environment. The human-machine interface (HMI)1 including an LCD display with different views makes the local use easy
and informs the user via indication messages. Modern technology is applied both in hardware and software solutions.
1. HMI is referred to as MMI in the relay and in the Relay Setting Tool.
The protection relay is part of the ABB Substation Automation system and extends the functionality and flexibility of the concept further.
3
Feeder Protection Relay
REX 521 1MRS752177-MBG
Features
Standard configuration B01:
Standard configuration B02:
• Three-phase non-directional overcurrent protection with three stages
• Three-phase non-directional overcurrent protection with three stages
• Non-directional earth-fault protection with three stages
• Three-phase transformer inrush and motor start-up current detector
• Phase discontinuity protection for three phases
• Non-directional earth-fault protection with three stages
• Three-phase thermal protection for cables
• Phase discontinuity protection for three phases
• Three-phase transformer inrush and motor start-up current detector
• Three-phase thermal protection for cables
• Supervision function for the energizing current input circuit
• Supervision function for the energizing current input circuit
• Current waveform distortion measurement
• Current waveform distortion measurement
• Three-phase current measurement
• Three-phase current measurement
• Neutral current measurement
• Neutral current measurement
• Calculation of the accumulated electric breaker wear of the circuit breaker (CB)
• Calculation of the accumulated electric breaker wear of the circuit breaker (CB)
• Transient disturbance recorder
• Transient disturbance recorder
• Trip-circuit supervision
• Trip-circuit supervision
• Delayed trip output for the circuit-breaker failure protection (CBFP) function
• Delayed trip output for the circuit-breaker failure protection (CBFP) function
• Circuit breaker control with indication
• Automatic reclosing 1...5 shots
• Lockout function
• Circuit breaker control with indication
• Object indication
• Lockout function
• Logic control position selector
• Object indication
• User-configurable I/Os
• Logic control position selector
• Interlocking
• User-configurable I/Os
• User-configurable alarm LEDs
• Interlocking • User-configurable alarm LEDs
3I >
50/51
MCS
I 0>
50N/51N
TCS
3I 2f >
68
I>
46
3
49F
CBFP
62
LO
86
CBCM
3I
3I >
50/51
MCS
I 0>
50N/51N
TCS
3I 2f>
68
CBCM
I>
46
3
49F
I
0 R
3I~harm
REX 521 B01 Fig. 1
000
I0
0
I
79
CBFP
62
LO
86
Block diagram of B01
4
0
I R
3I~harm
3I
REX 521 B02 Fig. 2
000
Block diagram of B02
I0
Feeder Protection Relay
REX 521 1MRS752177-MBG
Features (cont´d)
Standard configuration M01:
Standard configuration M02:
• Three-phase non-directional overcurrent protection with three stages
• Three-phase non-directional overcurrent protection with three stages
• Three-phase transformer inrush and motor start-up current detector
• Three-phase transformer inrush and motor start-up current detector
• Directional earth-fault protection with three stages
• Directional earth-fault protection with three stages
• Phase discontinuity protection for three phases
• Phase discontinuity protection for three phases
• Three-phase thermal protection for cables
• Three-phase thermal protection for cables
• Supervision function for the energizing current input circuit
• Supervision function for the energizing current input circuit
• Current waveform distortion measurement
• Current waveform distortion measurement
• Three-phase current measurement
• Three-phase current measurement
• Neutral current measurement
• Neutral current measurement
• Residual voltage measurement
• Residual voltage measurement
• Calculation of the accumulated electric breaker wear of the circuit breaker (CB)
• Calculation of the accumulated electric breaker wear of the circuit breaker (CB)
• Transient disturbance recorder
• Transient disturbance recorder
• Trip-circuit supervision
• Trip-circuit supervision
• Delayed trip output for the circuit-breaker failure protection (CBFP) function
• Delayed trip output for the circuit-breaker failure protection (CBFP) function
• Circuit breaker control with indication
• Automatic reclosing 1...5 shots
• Lockout function
• Circuit breaker control with indication
• Object indication
• Lockout function
• Logic control position selector
• Object indication
• User-configurable I/Os
• Logic control position selector
• Interlocking
• User-configurable I/Os
• User-configurable alarm LEDs
• Interlocking • User-configurable alarm LEDs
3I >
50/51
MCS
67N
TCS
3I 2f>
68
CBCM
I>
46
I 0>
3
000
50/51
MCS
67N
TCS
3I 2f>
68
CBCM
I>
46
3
49F
3I > 0
I
3I~harm
R
I 0>
49F
CBFP
62
LO
86
3I
I0
0 U0
Block diagram of M01
79
CBFP
62
LO
86
REX 521 M01 Fig. 3
I
000
0
I R
3I~harm
3I
I0
U0
REX 521 M02 Fig. 4
Block diagram of M02 5
Feeder Protection Relay
REX 521 1MRS752177-MBG
Features (cont´d)
The main difference between the standard configurations B01/B02 and standard configurations M01/M02 is the directional earthfault protection, which is included in the standard configurations M01 and M02. The difference between configurations B01 and B02, and likewise between M01 and M02, is the auto-reclosure function in B02 and M02. Standard configuration H01: • Three-phase directional overcurrent protection with two stages
• Interlocking • User-configurable alarm LEDs
3I>
• Directional earth-fault protection with three stages • Phase discontinuity protection for three phases • Three-phase thermal protection for cable • Synchro-check/voltage-check function with one stage • Supervision function for energizing current input circuit • Supervision function for energizing voltage input circuit • Current waveform distortion measurement • Voltage waveform distortion measurement • Three-phase current measurement • Neutral current measurement • Three phase-to-earth voltage measurements • Residual voltage measurement • System frequency measurement • Three-phase power and energy measurement
MCS TCS1 CBCM
I 0>
000
67N
0
3I~harm
3I 2f>
68
I>
46
3
49F
25
SYNC 0
I
CBFP LO
I R
3U~harm
3I
I0
P
3U
U
0
Q
f
pf
E
79 */62 86
REX 521 H01
Fig. 5
Block diagram of H01
Note! The standard configuration H01 is available only with the sensor HW version. Standard configuration H02: • Three-phase directional overcurrent protection with two stages • Three-phase non-directional overcurrent protection with two stages • Three-phase transformer inrush and motor start-up current detector • Directional earth-fault protection with three stages • Underfrequency or overfrequency protection with one stage • Phase discontinuity protection for three phases • Three-phase thermal protection for cables
• Calculation of the accumulated electric breaker wear of the circuit breaker (CB)
• Supervision function for energizing current input circuit
• Transient disturbance recorder
• Supervision function for energizing voltage input circuit
• Trip-circuit supervision • Delayed trip output for the circuit-breaker failure protection (CBFP) function
• Current waveform distortion measurement
• Automatic reclosing 1...5 shots
• Three-phase current measurement
• Circuit breaker control with indication
• Neutral current measurement
• Lockout function
• Three phase voltage measurements
• Object indication
• Residual voltage measurement
• Logic control position selector
• System frequency measurement
• User-configurable I/Os 6
50
3I>
• Three-phase non-directional overcurrent protection with one stage • Three-phase transformer inrush and motor start-up current detector
67
• Voltage waveform distortion measurement
Feeder Protection Relay
REX 521 1MRS752177-MBG
Features (cont´d)
• Three-phase power and energy measurement
• Synchro-check/voltage-check function with one stage
• Calculation of the accumulated electric breaker wear of the circuit breaker (CB)
• Supervision function for energizing current input circuit
• Transient disturbance recorder
• Supervision function for energizing voltage input circuit
• Trip-circuit supervision • Delayed trip output for the circuit-breaker failure protection (CBFP) function
• Current waveform distortion measurement • Voltage waveform distortion measurement
• Automatic reclosing 1...5 shots
• Three-phase current measurement
• Circuit breaker control with indication
• Neutral current measurement
• Lockout function
• Three phase voltage measurements
• Object indication
• Residual voltage measurement
• Logic control position selector
• System frequency measurement
• User-configurable I/Os
• Three-phase power and energy measurement
• Interlocking
• Calculation of the accumulated electric breaker wear of the circuit breaker (CB)
• User-configurable alarm LEDs
• Transient disturbance recorder 3I> 3I >
67
MCS1
50/51
TCS CBCM
I0 >
000
0
67N 3I~harm
• Trip-circuit supervision • Delayed trip output for the circuit-breaker failure protection (CBFP) function
I
• Automatic reclosing 1...5 shots
R
f
81U/81O
3I2f>
68
• Lockout function
I>
46
• Object indication
• Circuit breaker control with indication
3U~harm
3
49F
I
0
CBFP LO
3I
I0
P
3U
U0
Q
f
pf
79 */62 86
• Logic control position selectorUser-configurable I/Os • Interlocking • User-configurable alarm LEDs
E
REX 521 H02
3I >
Fig. 6
Block diagram of H02
Standard configuration H03:
I0 >
• Directional earth-fault protection with three stages • Phase discontinuity protection for three phases • Three-phase thermal protection for cable
67N
3I 2f>
68
I>
46
• Three-phase non-directional overcurrent protection with three stages • Three-phase transformer inrush and motor start-up current detector
50/51
MCS
000
TCS CBCM
0
I R
3I~harm 3U~harm
3
49F
25
SYNC 0
3I
I0
P
3U
U0
Q
f
pf
E
79
I
CBFP
*/62
LO
86
REX 521 H03
Fig. 7
Block diagram of H03
7
Feeder Protection Relay
REX 521 1MRS752177-MBG
Features (cont´d)
Standard configuration H04: • Three-phase non-directional overcurrent protection with three stages • Three-phase directional overcurrent protection with one stage
3I > 3I>
67
I0 >
67N
• Underfrequency or overfrequency protection with one stage • Three-phase transformer inrush and motor start-up current detector
I0 >
50N/51N
f
81U/81O
3I2f>
68
I>
46
• Non-directional earth-fault protection with three stages
• Three-phase thermal protection for cable • Supervision function for energizing current input circuit • Supervision function for energizing voltage input circuit • Current waveform distortion measurement • Voltage waveform distortion measurement • Three-phase current measurement • Neutral current measurement • Three phase voltage measurements • Residual voltage measurement
MCS
000
TCS1 CBCM
0
3I~harm
I R
3U~harm
• Directional earth-fault protection with three stages
• Phase discontinuity protection for three phases
50/51
3
49F
I
79
CBFP
*/62
LO
86
0
3I
I
3U
U0
Q
f
pf
E
0
P
REX 521 H04
Fig. 8
Block diagram of H04
Standard configuration H05: • Three-phase non-directional overcurrent protection with three stages • Non-directional earth-fault protection with three stages • Three-phase overvoltage protection with two stages
• System frequency measurement
• Three-phase undervoltage protection with two stages
• Three-phase power and energy measurement
• Residual overvoltage protection with three stages
• Calculation of the accumulated electric breaker wear of the circuit breaker (CB)
• Three-phase transformer inrush and motor start-up current detector
• Transient disturbance recorder
• Three-phase thermal overload protection for devices
• Trip-circuit supervision • Delayed trip output for the circuit-breaker failure protection (CBFP) function
• Supervision function for energizing current input circuit
• Automatic reclosing 1...5 shots
• Supervision function for energizing voltage input circuit
• Circuit breaker control with indication
• Current waveform distortion measurement
• Lockout function
• Voltage waveform distortion measurement
• Object indication
• Three-phase current measurement
• Logic control position selector
• Neutral current measurement
• User-configurable I/Os
• Three phase voltage measurements
• Interlocking
• Residual voltage measurement
• User-configurable alarm LEDs
• System frequency measurement • Three-phase power and energy measurement
8
Feeder Protection Relay
REX 521 1MRS752177-MBG
Features (cont´d)
• Calculation of the accumulated electric breaker wear of the circuit breaker (CB)
• Supervision function for energizing current input circuit
• Transient disturbance recorder
• Supervision function for energizing voltage input circuit
• Trip-circuit supervision • Delayed trip output for the circuit-breaker failure protection (CBFP) function
• Current waveform distortion measurement • Voltage waveform distortion measurement
• Circuit breaker control with indication
• Three-phase current measurement
• Lockout function
• Neutral current measurement
• Object indication
• Three phase voltage measurements
• Logic control position selector
• Residual voltage measurement
• User-configurable I/Os
• System frequency measurement
• Interlocking
• Three-phase power and energy measurement
• User-configurable alarm LEDs
• Calculation of the accumulated electric breaker wear of the circuit breaker (CB) 3I > I 0> 3I2f
50/51 50N/51N 68
MCS
000
• Trip-circuit supervision
CBCM
0
3I~harm U 0>
59N
3U>
59
3U
50/51
Standard configuration H06:
U 0>
59N
• Three-phase non-directional overcurrent protection with two stages
3U>
59
• Three-phase overvoltage protection with two stages
3U
I0>
I0>
• Three-phase undervoltage protection with two stages
• Three-phase motor start-up supervision • Three-phase thermal overload protection for devices
50N/51N 59
3U
60
27,47,59
CBFP
LO
E
49
3
Fig. 11
81U/81O
46R
F
• Fuse failure protection
• Supervision function for energizing voltage input circuit
TCS
3U>
• Phase sequence voltage protection
• Supervision function for energizing current input circuit
67N
000
3U~harm
• Phase reversal protection
• Three-phase non-directional undercurrent protection with one stage
MCS
3I~harm
• Underfrequency or overfrequency protection with one stage • Negative phase sequence (NPS) protection with two stages
50/51
*/62 86
Block diagram of H07
• Current waveform distortion measurement • Voltage waveform distortion measurement
Standard configuration H08:
• Three-phase current measurement
• Three-phase non-directional overcurrent protection with three stages
• Neutral current measurement • Three-phase voltage measurements • Residual voltage measurement • System frequency measurement • Three-phase power and energy 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 • Operation time counter
• Non-directional earth-fault protection with three stages • Three-phase overvoltage protection with two stages • Three-phase undervoltage protection with two stages • Residual overvoltage protection with three stages • Three-phase transformer inrush and motor start-up current detector • Three-phase thermal overload protection for devices • Supervision function for energizing current input circuit
• Lockout function
• Supervision function for energizing voltage input circuit
• Object indication
• Current waveform distortion measurement • Voltage waveform distortion measurement
10
Feeder Protection Relay
REX 521 1MRS752177-MBG
Features (cont´d)
• Three-phase current measurement
Standard configuration H09:
• Neutral current measurement
• Three-phase non-directional overcurrent protection with three stages
• Three phase voltage measurements
• Non-directional earth-fault protection with three stages
• Residual voltage measurement • System frequency measurement • Three-phase power and energy 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
• Three-phase overvoltage protection with two stages • Three-phase undervoltage protection with two stages • Residual overvoltage protection with three stages • Three-phase transformer inrush and motor start-up current detector • Underfrequency or overfrequency protection with two stages • Supervision function for energizing current input circuit
• Lockout function • Object indication • Logic control position selector
• Supervision function for energizing voltage input circuit
• User-configurable I/Os
• Current waveform distortion measurement
• Interlocking
• Voltage waveform distortion measurement
• User-configurable alarm LEDs
• Three-phase current measurement • Automatic reclosing 1...5 shots
3I >
50/51
I 0>
50N/51N
3I2f
68
U 0>
59N
3U>
59
3U
50/51
I 0>
50N/51N
3I2f
68
U 0>
59N
3U>
59
3U
50/51
MCS
I0>
50N/51N
TCS
3I2f
68
U0>
59N
3U>
59
3U
• Three-phase transformer inrush and motor start-up current detector • Underfrequency or overfrequency protection with two stages
0
CBCM
I
R
3U~harm
• Three-phase overvoltage protection with two stages • Three-phase undervoltage protection with two stages
000
67
U1< U2> U1>
I
0
P
3U
U 0
Q
f
pf
E
27,47,59 67N
I0 > f O
3I
81U/81O I
79
Fig. 14 Block diagram of H50 Note! The standard configuration H50 is available only with the voltage transformer (VT).
Feeder Protection Relay
REX 521 1MRS752177-MBG
Features (cont´d)
Standard configuration H51:
• Transient disturbance recorder
• Three-phase non-directional overcurrent protection with three stages.
• Trip-circuit supervision
• Three-phase directional overcurrent protection with one stage.
• Delayed trip output for the circuit breaker failure protection (CBFP) function • Circuit breaker control with indication
• Non-directional earth-fault protection with two stages
• Operation time counter
• Directional earth-fault protection with two stages
• Object indication
• Three-phase overvoltage protection with one stage • Three-phase undervoltage protection with one stage
• Lockout function • Logic control position selector • User-configurable I/Os • Interlocking • User-configurable alarm LEDs
• Underfrequency or overfrequency protection with two stages • Negative phase-sequence (NPS) protection with one stage • Three-phase motor start-up supervision • Three-phase thermal overload protection for devices • Residual overvoltage protection with one stage • Phase-sequence voltage protection • Fuse-failure protection • Three-phase non-directional undercurrent protection with one stage • Supervision function for energizing current input circuit • Supervision function for energizing voltage input circuit • Current waveform distortion measurement • Voltage waveform distortion measurement • Three-phase current measurement • Neutral current measurement • Three-phase voltage measurements • Residual voltage measurement • System frequency measurement • Three-phase power and energy measurement • Calculation of the accumulated electric breaker wear of the circuit breaker (CB)
3I> I0 >
50/51
MCS
67N
TCS
I0>
50N/51N
3U>
59
3U
59N
F
3
60 49
U1< U2> U1>
27,47,59
CBFP
*/62
LO
86
3I>
3I
67
Fig. 15 Block diagram of H51 Note! The standard configuration H51 is available only with the voltage transformer (VT).
13
Feeder Protection Relay
REX 521 1MRS752177-MBG
Applications
Several standard configurations are available for the protection relay. Refer to the REX 521 “Technical Reference Manual, Standard Configurations” for more detailed information. The B01 standard configuration for 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. The B02 standard configuration is designed to be used in single busbar systems using one circuit-breaker for selective short-circuit protection, time-overcurrent protection, earthfault protection and automatic reclosing. The configuration can be used in different types of networks such as radial isolated neutral networks, solidly earthed networks, resistant earthed networks and resonant earthed networks. The M01 standard configuration is designed to be used in single busbar systems using one circuit-breaker for selective short-circuit, time overcurrent and directional earth-fault protection of radial isolated neutral networks, solidly earthed networks, resistant earthed networks and resonant earthed networks. The M02 standard configuration is designed to be used in single busbar systems using one circuit-breaker for selective short-circuit protection, time-overcurrent protection, directional earth-fault protection and automatic reclosing. The configuration can be used in different types of networks such as of radial isolated neutral networks, solidly earthed networks, resistant earthed networks and resonant earthed networks. The H01 standard configuration is designed to be used in single busbar systems using one circuit-breaker for selective directional and non-directional short-circuit protection, directional time-overcurrent protection, directional earth-fault protection and automatic reclosing with syncro- and voltagecheck functionality. The H02 standard configuration is designed to be used in single busbar systems using one circuit-breaker for selective directional and non-directional short-circuit protection, directional and non-directional time-overcurrent protection, directional earth-fault protection and automatic reclosing.
14
The H03 standard configuration is designed to be used in single busbar systems using one circuit-breaker for selective non-directional short-circuit protection, non-directional timeovercurrent protection, directional earth-fault protection and automatic reclosing with syncro- and voltage-check functionality. The H04 standard configuration is designed to be used in single busbar systems using one circuit-breaker for selective non-directional short-circuit protection, non-directional timeovercurrent protection, directional and nondirectional earth-fault protection and automatic reclosing. The H05 standard configuration is designed to be used in single busbar systems using one circuit-breaker for selective non-directional short-circuit protection, non-directional timeovercurrent protection, non-directional earthfault protection, overvoltage protection, undervoltage protection, residual overvoltage protection and thermal overload protection for devices. The H06 standard configuration is designed to be used in single busbar systems using one circuit-breaker for selective non-directional short-circuit protection, non-directional timeovercurrent protection, overvoltage protection, undervoltage protection, residual overvoltage protection, underfrequency protection and overfrequency protection. The H07 standard configuration is designed for protection of large or medium-size threephase AC motors in circuit-breaker controlled motor drives. Due to the large number of protective functions integrated, the relay provides a complete protection against motor damage caused by electrical faults. The H07 configuration can also be applied to other objects needing thermal overload protection, such as power transformers. It can also be used in applications requiring overcurrent protection, under or overvoltage protection and/or directional or non-directional earthfault protection. The H08 standard configuration is designed to be used in single busbar systems using one circuit-breaker for selective non-directional short-circuit protection, non-directional timeovercurrent protection, non-directional earthfault protection, overvoltage protection, undervoltage protection, residual overvoltage protection and thermal overload protection for devices. The protection is based on
Feeder Protection Relay
REX 521 1MRS752177-MBG
Applications (cont´d)
phase-to-earth voltages. In addition, phase-tophase voltages are available in the measurement view. The H09 standard configuration for REX 521 is designed to be used in single busbar systems using one circuit breaker for selective non-directional short-circuit protection, nondirectional time-overcurrent protection, nondirectional earth-fault protection, overvoltage protection, undervoltage protection, residual overvoltage protection, underfrequency protection, overfrequency protection and automatic reclosing. The H50 standard configuration for REX 521 is designed to be used in single busbar systems by using one circuit breaker for selective non-directional short-circuit protection, directional and non-directional time-overcurrent protection, directional and/or non-directional earth-fault protection, overvoltage
protection, undervoltage protection, residual overvoltage protection, underfrequency protection, over-frequency protection and automatic reclosing. The H51 standard configuration for REX 521 is designed for protection of large or mediumsize three-phase AC motors in circuit breaker controlled motor drives. Due to the large number of protective functions integrated, the relay provides a complete protection against motor damage caused by electrical faults. The H51 configuration can be applied to other objects that need the thermal overload protection (such as power transformers). It can also be used in applications requiring overcurrent protection, directional overcurrent protection, under/overvoltage protection, directional or non-directional earth-fault protection, underfrequency protection and/or overfrequency protection.
15
Feeder Protection Relay
REX 521 1MRS752177-MBG
Design, hardware
Different hardware versions of REX 521 are shown in the table below. Table 1: REX 521 hardware versions Sensor REX521xSxxx
Transformers • Current transformers 1/5 A • Current transformers 0.2/1 A • Voltage transformers 100 V
High REX521xHxxx
Transformer modules (MIM)
Medium REX521xMxxx
REX 521 Basic REX521xBxxx
Relay type Version name
1
1
1
1
4
4 1 1
4 1 4
1 1 1
Sensor channels • Current sensor inputs • Voltage sensor inputs Main CPU modules
1
1
1
3 3 1
1
1
1
1
1
1
1
1
CPU_SP (SPA/ IEC plastic) CPU_SG (SPA/ IEC glass) CPU_LP (SPA/ IEC/ LON plastic) CPU_LG (SPA/ IEC/ LON glass) Power supply modules PS_87H (DItresh.=80 VDC) PS_87L (DItresh.=18 VDC) Display module 6 x 16 character display
16
Digital inputs
9
High-speed power outputs
1
Power outputs (PO)
3
Signalling outputs (SO)
2
IRF outputs
1
Trip-circuit supervision (TCS)
1
Feeder Protection Relay
REX 521 1MRS752177-MBG
Design, software
Functionality is available as part of the standard configurations B01, B02, M01, M02, H01, H02, H03, H04, H05, H06, H07, H08, H09, H50 and H51.
Functions available for use in the different standard configurations are listed below.
Table 2: Standard configurations for REX 521 HW versions
Basic
Standard configurations
Medium
High/Sensor
B01 B02 M01 M02 H011 H02 H03 H04 H05 H06 H07 H0823 H0923 H502 H512
ANSI device number
FB name (CD-ROM)
3I> 3I>> 3I>>> Io>
51-1 51-2 51-3 51N-1
NOC3Low NOC3High NOC3Inst NEF1Low
x x x x
x x x x
Io>>
51N-2
NEF1High
x
Io>>>
51N-3
NEF1Inst
x
Io>-->5
67N-1
DEF2Low
x
x
x
x
x
x
Io>>-->5
67N-2
DEF2High
x
x
x
x
x
x
Io>>>-->5 3I>-->
67N-3
DEF2Inst
x
x
x
x
x
x
67-1
DOC6Low
x
x6
3I>>-->
67-2
DOC6High
x
x6
3U> 3U>> 3U< 3U Iub> 3Ith> O-->I Uo> Uo>> Uo>>> f1 f2 SYNC1 Is2t n< 3I() I2> I2>> 3I< FUSEF 3Ithdev> U1U2_1
59-1 59-2 27-1 27-2 68 46 49F 79 59N-1 59N-2 59N-3 81-1 81-2 25-1 48 46R 46-1 46-2 37-1 60 49M/G/T 47-1
OV3Low OV3High UV3Low UV3High Inrush3 CUB3Low TOL3Cab AR5Func ROV1Low ROV1High ROV1Inst Freq1St1 Freq1St2 SCVCSt1 MotStart PREV3 NPS3Low NPS3High NUC3St1 FuseFail Tol3Dev PSV3St1
IEC symbol Protection
x x x
x4
x x x x
x
x4
x
x
x4
x
x x x x
x x x
x x x
x x x
x x x x
x x x
x x x x
x x x x
x x x
x x x
x x x x
x x x x
x x x x
x x x x
x x x x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x x x x
x x x x
x x x x x x
x x x x x
x x
x
x x x x
x x x x x
x x x x
x x x x x
x x x x
x
x
x x x x x
x x x x x
x
x x x x x x
x x x
x
x x
x x
x
x x x x x x x x x
x
x x x
x
x x x
x x x
x x x
x
Control functions IO CB1 COCB1 IO IND1 COIND1 IO IND2 COIND2
COCB1 COIND1 COIND2
x x x
x x x
x x x
x x x
x x x
x x x
x x x
x x x
x x x
x x x
x x x
x x x
x x x
17
Feeder Protection Relay
REX 521 1MRS752177-MBG
Table 2: Standard configurations for REX 521 (continued) HW versions
Basic
ANSI device number
IO IND3 COIND3
High/Sensor
B01 B02 M01 M02 H011 H02 H03 H04 H05 H06 H07 H0823 H0923 H502 H512
Standard configurations IEC symbol
Medium
FB name (CD-ROM) COIND3 x x
x x
x x
x x
x x
x x
x x
x x
x x
x x
x7 x x
MECU3A MECU1A MEVO1A MEDREC MEVO3A MEVO3B MEFR1 MEPE7 MEAI1
x x
x x
x
x
x x x x
x x x x
x x x x x
x x x x x
x x x x x
x x x x x
x x x x x
x x x x x
x x x x x
x x
x x
x x
x x
x x
x x
x x x
CMBWEAR1 CMTCS1 CMCU3 CMVO3 CMTIME1
x x x
x x x
x x x
x x x
x x x x
x x x x
x x x x
x x x x
x x x x
x x x x
IO POS COLOCAT COLOCAT ALARM1-8 ALARM1-8 MMIALAR1-8
x x
x x
x x
x7 x x
x x x x x x x x
x x x x x x x x
x x x x x
x x x x x
x x
x x x
x x x x x
x x x x
x x x x
x x x x
x x x x x
Measurement 3I Io Uo DREC 3U 3U_B f PQE AI1
3I Io Uo DREC 3U 3U_B f PQE AI1
Condition monitoring CB wear1 TCS1 MCS 3I MCS 3U TIME1
CB wear1 TCS1 MCS 3I MCS 3U TIME1
Power quality monitoring PQ 3Inf PQ 3Unf
PQ 3Inf PQ 3Unf
PQCU3H PQVO3H
x
x
x
x
x x
x x
x x
x x
x x
x x
x x
x x
x x
x x
x x
SWGRP
SWGRP
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Standard SWGRP 1
H01 available only as sensor version
2
Available only as VT version
3
VTs are used to measure phase-to-earth voltages, calculated phase-to-phase voltages are shown by 3U_B
4Configured
fixedly to the Io (1/5 A) channel or Ios if selected
5
Can be used as Io>, Io>> and Io>>> or Uo>, Uo>> and Uo>>> function block with some limitations
6
3I>-> and 3I>>-> cannot be set to operate as 3I>, 3I>> or 3I>>>
7
Motor status indication
Note: Calculated Uo (Uos) is used in the Sensor versions of H01 and H03 configurations. Calculated Io (Ios) is available in H01-H05, H08, H09 and H50 configurations.
18
For more information, see REX 521 Technical Reference Manual, Standard Configurations.
Feeder Protection Relay
REX 521 1MRS752177-MBG
Technical data Table 3: Energizing inputs Rated frequency Current inputs
50.0/60.0 Hz rated current
0,2 A/1 A/5 A
Thermal withstand capability
Voltage inputs
Sensor inputs
continuously
1.5 A/4 A/20 A
for 1 s
20 A/100 A/500 A
dynamic current withstand, half-wave value
50 A/250 A/1250 A
input impedance
