IEC 61850 or
function name
ANSI Function description Line Differential
RED650 (A11)
Differential protection
LT3CPDIF 87LT Line differential protection for 3 CT sets, 2-3 line ends, in-zone transformer 1
LDLPSCH 87L Line differential protection logic 1
Impedance protection
ZMFPDIS 21 Distance protection, quad and mho characteristic 1
ZMRPSB 68 Power swing detection 1
PSLPSCH Power swing logic 1
ZCVPSOF Automatic switch onto fault logic, voltage and current based 1
2.3 Back-up protection functions
GUID-A8D0852F-807F-4442-8730-E44808E194F0 v13
IEC 61850 or
function name
ANSI Function description Line Differential
RED650 (A11)
Current protection
PHPIOC 50 Instantaneous phase overcurrent protection 1
OC4PTOC
51_67
1)
Directional phase overcurrent protection, four steps 1
EFPIOC 50N Instantaneous residual overcurrent protection 1
EF4PTOC 51N
67N
2)
Directional residual overcurrent protection, four steps 1
LCPTTR 26 Thermal overload protection, one time constant, Celsius 1
LFPTTR 26 Thermal overload protection, one time constant, Fahrenheit 1
CCRBRF 50BF Breaker failure protection 1
CCPDSC 52PD Pole discordance protection 1
Voltage protection
UV2PTUV 27 Two step undervoltage protection 1
OV2PTOV 59 Two step overvoltage protection 1
ROV2PTOV 59N Two step residual overvoltage protection 1
Frequency protection
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1MRK 505 393-UEN B Section 2
Application
Line differential protection RED650 2.2 IEC 29
Application manual