Functions, codes and symbols - Arc protection - Auto synchronization - Bay control and measurement - Merging unit - Transformer protection - 2 winding - Feeder protection - Voltage regulation - Capacitor bank protection - Petersen Coil control - Grid automation - Busbar differential protection (high impedance) - Back-up protection - Motor protection - Busbar protection (voltage and frequency) - Transformer protection - 3 winding - Interconnection protection - Generator protection - Power management/Load shedding - Engineering Manual - REX640 Protection and control - Relion Protection and Control - PCL6 - IEC - ANSI - 20.04.2026

REX640 Engineering Manual

Table 1. Functions included in the relay
Function IEC 61850 IEC 60617 ANSI
Protection
Distance protection DSTPDIS Z< 21P,21N
Local acceleration logic DSTPLAL LAL 21LAL
Scheme communication logic DSOCPSCH CL 85 21SCHLGC
Phase segregated scheme communication logic SPDSOCPSCH CLSP 85 21SCHLGCSP
Current reversal and weak-end infeed logic CRWPSCH CLCRW 85 21CREV,WEI
Phase segregated current reversal and weak-end infeed logic SPCRWPSCH CLCRWSP 85 21CREV,WEISP
Communication logic for residual overcurrent RESCPSCH CLN 85 67G/N SCHLGC
Current reversal and weak-end infeed logic for residual overcurrent RCRWPSCH CLCRWN 85 67G/N CREV,WEI
Power swing detection DSTRPSB Zpsb 68
Line differential protection with inzone power transformer LNPLDF 3Id/I> 87L
Binary signal transfer BSTGAPC BST BST
Switch-onto-fault protection CVPSOF CVPSOF SOTF
Three-phase non- directional overcurrent protection, low stage PHLPTOC 3I> 51P-1
Three-phase non- directional overcurrent protection, high stage PHHPTOC 3I>> 51P-2
Three-phase non- directional overcurrent protection, instantaneous stage PHIPTOC 3I>>> 50P
Three-phase non-directional overcurrent protection, instantaneous only stage PHIPIOC 3I>>>> 50P
Three-phase non-directional long time overcurrent protection PHLTPTOC 3I> 51LT
Three-phase directional overcurrent protection, low stage DPHLPDOC 3I>-> 67P/51P-1
Three-phase directional overcurrent protection, high stage DPHHPDOC 3I>>-> 67P/51P-2
Non-directional earth-fault protection, low stage EFLPTOC Io> 51G/51N-1
Non-directional earth-fault protection, high stage EFHPTOC Io>> 51N-2
Non-directional earth-fault protection, instantaneous stage EFIPTOC Io>>> 50G/50N
Non-directional earth-fault protection, instantaneous only stage EFIPIOC Io>>>> 50G/50N
Directional earth-fault protection, low stage DEFLPDEF Io>-> 67G/N-1 51G/N-1
Directional earth-fault protection, high stage DEFHPDEF Io>>-> 67G/N-1 51G/N-2
Three-phase power directional element DPSRDIR I1 -> 67P-TC
Neutral power directional element DNZSRDIR I2->,Io-> 67N-TC
Admittance-based earth-fault protection EFPADM Yo>-> 21YN
Multifrequency admittance-based earth-fault protection MFADPSDE Io>->Y 67NYH
Wattmetric-based earth-fault protection WPWDE Po>-> 32N
Transient/intermittent earth-fault protection INTRPTEF Io>->IEF 67NTEF/NIEF
Harmonics-based earth-fault protection HAEFPTOC Io>HA 51NH
Touch voltage based earth-fault current protection IFPTOC IF>/UT> 46SNQ/59N
Negative-sequence overcurrent protection NSPTOC I2>M 46M
Phase discontinuity protection PDNSPTOC I2/I1> 46PD
Residual overvoltage protection ROVPTOV Uo> 59G/59N
Three-phase undervoltage protection PHPTUV 3U< 27
Three-phase overvoltage variation protection PHVPTOV 3Urms> 59.S1
Three-phase overvoltage protection PHPTOV 3U> 59
Positive-sequence overvoltage protection PSPTOV U1> 59PS
Positive-sequence undervoltage protection PSPTUV U1< 27PS
Negative-sequence overvoltage protection NSPTOV U2> 47,59NS
Frequency protection FRPFRQ f>/f<,df/dt 81
Three-phase voltage-dependent overcurrent protection PHPVOC 3I(U)> 51V
Overexcitation protection OEPVPH U/f> 24
Three-phase thermal protection for feeders, cables and distribution transformers T1PTTR 3Ith>F 49F
Three-phase thermal overload protection, two time constants T2PTTR 3Ith>T/G/C 49T/G/C
Three-phase overload protection for shunt capacitor banks COLPTOC 3I>3I< 51,37,86C
Current unbalance protection for shunt capacitor banks CUBPTOC dI>C 60N
Three-phase current unbalance protection for shunt capacitor banks HCUBPTOC 3dI>C 60P
Shunt capacitor bank switching resonance protection, current based SRCPTOC TD> 55ITHD
Compensated neutral unbalance voltage protection CNUPTOV CNU> 59NU
Phase voltage differential protection for shunt capacitor banks CPHPTDV 3dU> 87V
Directional negative- sequence overcurrent protection DNSPDOC I2>-> 67Q
Low-voltage ride- through protection LVRTPTUV UU 27RT
Voltage vector shift protection VVSPPAM VS 78VS
Directional reactive power undervoltage protection DQPTUV Q>-> ,3U< 32Q,27
Reverse power/ directional overpower protection DOPPDPR P>/Q> 32R/32O
Underpower protection DUPPDPR P< 32U
Three-phase under impedance protection UZPDIS ZZ 21G
Directional negative sequence impedance protection DNZPDIS Z2-> Z2Q
Three-phase under excitation protection UEXPDIS X< 40
Third harmonic-based stator earth-fault protection H3EFPSEF dUo>/Uo3H 64TN
Rotor earth-fault protection (injection method) MREFPTOC Io>R 64R
Generator shaft leakage current GSLPTOC I>,GS 38, 51
Thermal overload protection for rotors RPTTR 3Ith>R 49R
High-impedance or flux-balance based differential protection MHZPDIF 3dIHi>M 87HIM
Out-of-step protection with double blinders OOSRPSB OOS 78PS
Negative-sequence overcurrent protection for machines MNSPTOC I2>M 46M
Loss of phase, undercurrent PHPTUC 3I< 37
Loss of load supervision LOFLPTUC 3I< 37
Motor load jam protection JAMPTOC Ist> 50TDJAM
Motor start-up supervision STTPMSU Is2t n< 49,66,48,50TDLR
Motor start counter MSCPMRI n< 66
Phase reversal protection PREVPTOC I2>> 46R
Thermal overload protection for motors MPTTR 3Ith>M 49M
Stabilized and instantaneous differential protection for machines MPDIF 3dl>M/G 87M/87G
Underpower factor protection MPUPF PF< 55U
Stabilized and instantaneous differential protection for two- or three- winding transformers TR3PTDF 3dI>3W 87T3
Stabilized and instantaneous differential protection for two-winding transformers TR2PTDF 3dI>T 87T
Numerical stabilized low-impedance restricted earth-fault protection LREFPNDF dIoLo> 87NLI
High-impedance based restricted earth- fault protection HREFPDIF dIoHi> 87NHI
High-impedance differential protection for phase A HIAPDIF dHi_A> 87_A
High-impedance differential protection for phase B HIBPDIF dHi_B> 87_B
High-impedance differential protection for phase C HICPDIF dHi_C> 87_C
Circuit breaker failure protection CCBRBRF 3I>/Io>BF 50BF
Circuit breaker failure protection - single phase breakers SPCCBRBRF 3I>/Io>BFSP 50BFSP
Circuit breaker pole discrepancy protection CBPDSC CBPD 52PD
Three-phase inrush detector INRPHAR 3I2f> 68HB
Residual current inrush detector RINRPHAR Io2f> 68HBG/N
Master trip TRPPTRC Master Trip 94/86
Master trip - single phase SPTRPPTRC Master trip SP 94/86SP
Arc protection ARCSARC ARC AFD
High-impedance fault detection PHIZ HIF HIZ
Fault locator SCEFRFLO FLOC FLOC
Load-shedding and restoration LSHDPFRQ UFLS/R 81LSH
Multipurpose protection MAPGAPC MAP MAP
Accidental energization protection GAEPVOC U<,I> 50/27
Load blinder LBRDOB LB 21LB
Cable end protection CEPNDF dIo> 87N
Cold load pickup CLPGAPC CLP 62CLD
Current disturbance detector CDDPTOC I>>>CDD 50DD
Control
Circuit-breaker control CBXCBR I <-> O CB 52
Circuit-breaker control - single phase circuit breakers SCBXCBR I <-> O CBSP 52SP
Three-state disconnector control P3SXSWI I<->O P3S 29DS/GS
Disconnector control DCXSWI I <-> O DCC 29DS
Earthing switch control ESXSWI I <-> O ESC 29GS
Three-state disconnector position indication P3SSXSWI I<->O P3SS 29DS/GS
Disconnector position indication DCSXSWI I <-> O DC 29DS
Earthing switch position indication ESSXSWI I <-> O ES 29GS
Emergency start-up ESMGAPC ESTART EST,62
Autoreclosing DARREC O->I 79
Autoreclosing - single phase SPARREC O -> I SP 79SP
Autosynchronizer for generator breaker ASGCSYN AUTOSYNCG 25AUTOSYNCG
Autosynchronizer for network breaker ASNSCSYN AUTOSYNC 25AUTOSYNCBT/T
Autosynchronizer co-ordinator ASCGAPC AUTOSYNC 25AUTOSYNC
Synchronism and energizing check SECRSYN SYNC 25
Tap changer control with voltage regulator OL5ATCC COLTC 90V
Tap changer position indication and manual control TPOSYLTC TPOSM 84T
Transformer data combiner OLGAPC OLGAPC OLGAPC
Petersen coil controller PASANCR ANCR 90
High speed bus transfer HSABTC I<->O BT HSBT
Condition monitoring and supervision
Circuit-breaker condition monitoring SSCBR CBCM 52CM
Circuit-breaker condition monitoring - single phase circuit breakers SPSCBR CBCMSP 52CMSP
Motor controlled earthing switch and disconnector supervision ESDCSSWI ESDCCM 29CM
Hot-spot and insulation ageing rate monitoring for transformers HSARSPTR 3Ihp>T 26/49HS
Cable Fault Detection RCFD CFD CFD
Trip circuit supervision TCSSCBR TCS TCM
Current circuit supervision CCSPVC MCS 3I CCM
Current circuit supervision for transformers CTSRCTF MCS 3I,I2 CCM 3I,I2
Current transformer supervision for high- impedance protection scheme for phase A HZCCASPVC MCS I_A CCM_A
Current transformer supervision for high- impedance protection scheme for phase B HZCCBSPVC MCS I_B CCM_B
Current transformer supervision for high- impedance protection scheme for phase C HZCCCSPVC MCS I_C CCM_C
Fuse failure supervision SEQSPVC FUSEF VCM, 60
Fuse failure voltage difference supervision FFVDSPVC FUSEFVD VCM, 60
Protection communication supervision PCSITPC PCS PCS
Runtime counter for machines and devices MDSOPT OPTS OPTM
Three-phase remanent undervoltage supervision MSVPR 3U<R 27R
Diesel Generator Monitoring DGMGAPC P><,U/f >< 32/40G
Measurement
Three-phase current measurement CMMXU 3I IA, IB, IC
Sequence current measurement CSMSQI I1, I2, I0 I1, I2, I0
Residual current measurement RESCMMXU Io IG
Three-phase voltage measurement VMMXU 3U VA, VB, VC
Single-phase voltage measurement VAMMXU U_A V_A
Phase voltage measurement VPHMMXU 3UL VL
Residual voltage measurement RESVMMXU Uo VG/VN
Sequence voltage measurement VSMSQI U1, U2, U0 V1, V2, V0
Three-phase power and energy measurement PEMMXU P, E P, E
Load profile recorder LDPRLRC LOADPROF LOADPROF
Frequency measurement FMMXU f f
Power quality
Current total demand, harmonic distortion, DC component (TDD, THD, DC) and individual harmonics CHMHAI PQM3IH PQM ITHD,IDC
Voltage total harmonic distortion, DC component (THD, DC) and individual harmonics VHMHAI PQM3VH PQM VTHD,VDC
Voltage variation PHQVVR PQMU PQMV SWE,SAG,INT
Voltage unbalance VSQVUB PQUUB PQMV UB
Traditional LED indication
LED indication control LEDPTRC LEDPTRC LEDPTRC
Individual virtual LED control LED LED LED
Logging functions
Disturbance recorder (common functionality) RDRE DR RDRE
Disturbance recorder, analog channels 1...12 A1RADR A1RADR A1RADR
Disturbance recorder, analog channels 13...24 A2RADR A2RADR A2RADR
Disturbance recorder, binary channels 1...32 B1RBDR B1RBDR B1RBDR
Disturbance recorder, binary channels 33...64 B2RBDR B2RBDR B2RBDR
Fault recorder FLTRFRC FAULTREC FR
Other functionality
Parameter setting groups PROTECTION PROTECTION PROTECTION
Time master supervision GNRLLTMS TSYNC TSYNC
Serial port supervision SERLCCH SERLCCH SERLCCH
IEC 61850-1 MMS MMSLPRT MMS MMS
IEC 61850-1 GOOSE GSELPRT GSE GSE
IEC 60870-5-103 protocol I3CLPRT I3C I3C
IEC 60870-5-104 protocol I5CLPRT I5C I5C
DNP3 protocol DNPLPRT DNP 3.0 DNP 3.0
Modbus protocol (slave) MBSLPRT MBS MBS
Modbus protocol (master) MBMLPRT MBM MBM
Received Modbus binary value MMVGAPC MMV MMV
Received Modbus 32-bit integer value MMVI4GAPC MMVI4 MMVI4
Received Modbus measured value MMVF4GAPC MMVF4 MMVF4
OR gate with two inputs OR OR OR
OR gate with six inputs OR6 OR6 OR6
OR gate with twenty inputs OR20 OR20 OR20
AND gate with two inputs AND AND AND
AND gate with six inputs AND6 AND6 AND6
AND gate with twenty inputs AND20 AND20 AND20
XOR gate with two inputs XOR XOR XOR
NOT gate NOT NOT NOT
Real maximum value selector MAX3R MAX3R MAX3R
Real minimum value selector MIN3R MIN3R MIN3R
Rising edge detector R_TRIG R_TRIG R_TRIG
Falling edge detector F_TRIG F_TRIG F_TRIG
Real switch selector SWITCHR SWITCHR SWITCHR
Integer 32-bit switch selector SWITCHI32 SWITCHI32 SWITCHI32
SR flip-flop, volatile SR SR SR
RS flip-flop, volatile RS RS RS
Minimum pulse timer, two channels TPGAPC TP 62TP
Minimum pulse timer second resolution, two channels TPSGAPC TPS 62TPS
Minimum pulse timer minutes resolution, two channels TPMGAPC TPM 62TPM
Pulse counter for energy measurement PCGAPC PCGAPC PCGAPC
Pulse timer, eight channels PTGAPC PT 62PT
Time delay off, eight channels TOFGAPC TOF 62TOF
Time delay on, eight channel TONGAPC TON 62TON
Daily timer DTMGAPC DTM DTM
Calendar function CALGAPC CAL CAL
SR flip-flop, eight channels, nonvolatile SRGAPC SR SR
Boolean value event creation MVGAPC MV MV
Integer value event creation MVI4GAPC MVI4 MVI4
Analog value event creation with scaling SCA4GAPC SCA4 SCA4
Generic control points SPCGAPC SPC SPCG
Generic up-down counter UDFCNT UDCNT UDCNT
Local/Remote control CONTROL CONTROL CONTROL
External HMI wake-up EIHMI EIHMI EIHMI
Real addition ADDR ADDR ADDR
Real subtraction SUBR SUBR SUBR
Real multiplication MULR MULR MULR
Real division DIVR DIVR DIVR
Real equal comparator EQR EQR EQR
Real not equal comparator NER NER NER
Real greater than or equal comparator GER GER GER
Real less than or equal comparator LER LER LER
Minimum, maximum and average value calculator MINMAXAVE12R MINMAXAVE12R MINMAXAVE12R
Voltage switch VMSWI VSWI VSWI
Current sum CMSUM CSUM CSUM
Current switch CMSWI CMSWI CMSWI
Phase current preprocessing ILTCTR ILTCTR ILTCTR
Residual current preprocessing RESTCTR RESTCTR RESTCTR
Phase and residual voltage preprocessing UTVTR UTVTR UTVTR
Residual current preprocessing, current measured as voltage RESUTCTR Io(U) Io(U)
SMV stream receiver (IEC 61850-9-2LE and IEC 61869-9 with a maximum of 24 channel outputs) SMVRCV SMVRCV SMVRCV
SMV stream sender (IEC 61850-9-2 LE) SMVSENDER SMVSENDER SMVSENDER
SMV stream sender (IEC 61869-9) SMVSENDER61869 SMVSENDER61869 SMVSENDER61869
SMV stream channel quality decoder SMV_QUALITY SMV_QUALITY SMV_QUALITY
Redundant Ethernet channel supervision RCHLCCH RCHLCCH RCHLCCH
Ethernet channel supervision SCHLCCH SCHLCCH SCHLCCH
HMI Ethernet channel supervision HMILCCH HMILCCH HMILCCH
Received GOOSE binary information GOOSERCV_BIN GOOSERCV_BIN GOOSERCV_BIN
Received GOOSE double binary information GOOSERCV_DP GOOSERCV_DP GOOSERCV_DP
Received GOOSE measured value information GOOSERCV_MV GOOSERCV_MV GOOSERCV_MV
Received GOOSE 8- bit integer value information GOOSERCV_INT8 GOOSERCV_INT8 GOOSERCV_INT8
Received GOOSE 32- bit integer value information GOOSERCV_INT32 GOOSERCV_INT32 GOOSERCV_INT32
Received GOOSE interlocking information GOOSERCV_INTL GOOSERCV_INTL GOOSERCV_INTL
Received GOOSE measured value (phasor) information GOOSERCV_CMV GOOSERCV_CMV GOOSERCV_CMV
Received GOOSE enumerator value information GOOSERCV_ENUM GOOSERCV_ENUM GOOSERCV_ENUM
Bad signal quality QTY_BAD QTY_BAD QTY_BAD
Good signal quality QTY_GOOD QTY_GOOD QTY_GOOD
Received GOOSE Test mode QTY_GOOSE_TEST QTY_GOOSE_TEST QTY_GOOSE_TEST
GOOSE communication quality QTY_GOOSE_COMM QTY_GOOSE_COMM QTY_GOOSE_COMM
GOOSE data health T_HEALTH T_HEALTH T_HEALTH
Fault direction evaluation T_DIR T_DIR T_DIR
Enumerator to Boolean conversion T_TCMD T_TCMD T_TCMD
32-bit integer to binary command conversion T_TCMD_BIN T_TCMD_BIN T_TCMD_BIN
Binary command to 32-bit integer conversion T_BIN_TCMD T_BIN_TCMD T_BIN_TCMD
Switching device status decoder - CLOSE position T_POS_CL T_POS_CL T_POS_CL
Switching device status decoder - OPEN position T_POS_OP T_POS_OP T_POS_OP
Switching device status decoder - OK status T_POS_OK T_POS_OK T_POS_OK
Controllable gate, 8 Channels GATEGAPC GATEGAPC GATEGAPC
Security application GSAL GSAL GSAL
Hotline tag HLTGAPC HLTGAPC HLTGAPC
16 settable 32-bit integer values SETI32GAPC SETI32GAPC SETI32GAPC
16 settable real values SETRGAPC SETRGAPC SETRGAPC
Boolean to integer 32- bit conversion T_B16_TO_I32 T_B16_TO_I32 T_B16_TO_I32
Integer 8-bit to integer 32-bit conversion T_I8_TO_I32 T_I8_TO_I32 T_I8_TO_I32
Integer 32-bit to Boolean conversion T_I32_TO_B16 T_I32_TO_B16 T_I32_TO_B16
Integer 32-bit to real conversion T_I32_TO_R T_I32_TO_R T_I32_TO_R
Real to integer 8-bit conversion T_R_TO_I8 T_R_TO_I8 T_R_TO_I8
Real to integer 32-bit conversion T_R_TO_I32 T_R_TO_I32 T_R_TO_I32
Packed phase start status decoder T_STARTS_ABC T_STARTS_ABC T_STARTS_ABC
Packed phase operate status decoder T_OPRS_ABC T_OPRS_ABC T_OPRS_ABC
Constant FALSE FALSE FALSE FALSE
Constant TRUE TRUE TRUE TRUE