
Table 1: Protection functions
Function IEC 61850 IEC 60617 ANSI
Logical
device Logical nodes
Three-phase non-directional
overcurrent protection, low
stage
PHLPTOC 3I> 51P-1 LD0 PHLPTOC
Three-phase non-directional
overcurrent protection, high
stage
PHHPTOC 3I>> 51P-2 LD0 PHHPTOC
Three-phase non-directional
overcurrent protection, instan-
taneous stage
PHIPTOC 3I>>> 50P LD0 PHIPTOC
Three-phase directional over-
current protection, low stage
DPHLPDOC 3I> -> 67P/51P-1 LD0 DPHLPTOC DPHLRDIR
Three-phase directional over-
current protection, high stage
DPHHPDOC 3I>> -> 67P/51P-2 LD0 DPHHPTOC DPHHRDIR
Non-directional earth-fault
protection, low stage
EFLPTOC Io> 51G/51N-1 LD0 EFLPTOC
Non-directional earth-fault
protection, high stage
EFHPTOC Io>> 51G/51N-2 LD0 EFHPTOC
Non-directional earth-fault
protection, instantaneous
stage
EFIPTOC Io>>> 50G/50N LD0 EFIPTOC
Directional earth-fault protec-
tion, low stage
DEFLPDEF Io> -> 67G/N-1 51G/N-1 LD0 DEFLPTOC DEFLRDIR
Directional earth-fault protec-
tion, high stage
DEFHPDEF lo>> -> 67G/N-1 51G/N-2 LD0 DEFHPTOC DEFHRDIR
Admittance-based earth-fault
protection
EFPADM Yo> -> 21YN LD0 EFPADM
Wattmetric-based earth-fault
protection
WPWDE Po> -> 32N LD0 WRDIR WPSDE
WMMXU
Transient/intermittent earth-
fault protection
INTRPTEF lo> -> IEF 67NTEF/NIEF LD0 INTRPTEF
Non-directional (cross-coun-
try) earth-fault protection, us-
ing calculated Io
EFHPTOC Io>> 51G/51N-2 LD0 EFHPTOC
Negative-sequence overcurrent
protection
NSPTOC I2> 46M LD0 NSPTOC
Phase discontinuity protection PDNSPTOC I2/I1> 46PD LD0 PDNSPTOC
Residual overvoltage protec-
tion
ROVPTOV Uo> 59G/59N LD0 ROVPTOV
Three-phase undervoltage pro-
tection
PHPTUV 3U< 27 LD0 PHPTUV
Three-phase overvoltage pro-
tection
PHPTOV 3U> 59 LD0 PHPTOV
Positive-sequence undervolt-
age protection
PSPTUV U1< 27PS LD0 PSPTUV
Negative-sequence overvolt-
age protection
NSPTOV U2> 59NS LD0 NSPTOV
Frequency protection FRPFRQ f>/f<,df/dt 81 LD0 FRPTRC FRPTOF
FRPTUF FRPFRC
Distance protection DSTPDIS Z< 21P, 21N LD0 GFCPDIS
GFCRDIR
DST1PDIS
DST2PDIS
DST3PDIS
DST4PDIS
DST5PDIS
DSTRDIR
GFC1RFRC
Table continues on the next page
Introduction 1MRS758850 D
14 SSC600
Operation Manual