Back-up protection functions
IEC 61850/
Function
block
name
ANSI
Function description
Transformer
RET650 (A01)
2W/1CB
RET650 (A05)
3W/1CB
RET650 (A07)
OLTC
Current protection
PHPIOC
50
Instantaneous phase overcurrent
protection
2
3
OC4PTOC
51/67
Four step directional phase overcurrent
protection
2
3
2
EFPIOC
50N
Instantaneous residual overcurrent
protection
2
3
EF4PTOC
51N/
67N
Four step directional residual
overcurrent protection
2
3
2
TRPTTR
49
Thermal overload protection, two time
constants
2
3
2
CCRBRF
50BF
Breaker failure protection
2
3
CCRPLD
52PD
Pole discordance protection
2
3
GUPPDUP
37
Directional underpower protection
1
1
2
GOPPDOP
32
Directional overpower protection
1
1
2
DNSPTOC
46
Negative sequence based overcurrent
function
1
2
Voltage protection
UV2PTUV
27
Two step undervoltage protection
1
1
2
OV2PTOV
59
Two step overvoltage protection
1
1
2
ROV2PTOV 59N
Two step residual overvoltage
protection
1
1
2
OEXPVPH
24
Overexcitation protection
1
Frequency protection
Transformer protection RET650
1MRK 504 127-BEN -
Product version: 1.1
Issued: February 2011
ABB
9