Table 233. Functions included in the relay, continued
Function IEC 61850 IEC 60617 ANSI
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
Three-phase underimpedance protection UZPDIS ZZ 21G
Three-phase underexcitation 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
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
1MRS759144 A
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