Function IEC 61850 IEC 60617 ANSI
Transient/intermittent earth-fault
protection
INTRPTEF Io> -> IEF 67NTEF/NIEF
Harmonics-based earth-fault
protection
HAEFPTOC Io>HA 51NH
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> 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
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
Table continues on next page
1MRS759117 A Section 1
Introduction
REX640 9
Engineering Manual
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