3. Available functions
Main protection functions
IEC 61850/
Function
block name
ANSI Function description
Transformer
RET650 (A01)
2W/1CB
RET650 (A05)
3W/1CB
RET650 (A07)
OLTC
Differential protection
T2WPDIF
87T
Transformer differential protection, two
winding
1
T3WPDIF
87T
Transformer differential protection, three
winding
1
REFPDIF
87N
Restricted earth fault protection, low
impedance
2
3
HZPDIF
87
1Ph High impedance differential
protection
2
2
Transformer protection RET650
1MRK 504 127-BEN -
Product version: 1.1
Issued: February 2011
8
ABB