Section 2
Available functions
2.1
Main protection functions
IEC 61850 or
Function name
ANSI
Function description
Transformer
RET650
RET650 (A01
)
2W/1CB
RET650 (A05
)
3W/1CB
RET650 (A07
)
OLTC
Differential protection
T2WPDIF
87T
Transformer differential protection, two winding
0–1
1
T3WPDIF
87T
Transformer differential protection, three winding
0–1
1
REFPDIF
87N
Restricted earth fault protection, low impedance
0–3
2
3
HZPDIF
87
1Ph High impedance differential protection
0–2
2
2
Impedance protection
ZMRPSB
68
Power swing detection
0–1
ZGCPDIS
21G
Underimpedance protection for generators and
transformers
0–1
LEPDIS
Load encroachment
0–1
2.2
Back-up protection functions
IEC 61850 or
Function name
ANSI
Function description
Transformer
RET650
RET650 (A01) 2W/1CB
RET650 (A05) 3W/1CB
RET650 (A07) OLTC
Current protection
PHPIOC
50
Instantaneous phase overcurrent protection, 3–
phase output
0–3
2
3
OC4PTOC
51/67
Four step phase overcurrent protection, 3-phase
output
0–3
2
3
2
EFPIOC
50N
Instantaneous residual overcurrent protection
0–3
2
3
EF4PTOC
51N/67N
Four step residual overcurrent protection, zero/
negative sequence direction
0–3
2
3
2
TRPTTR
49
Thermal overload protection, two time constants
0–3
2
3
2
Table continues on next page
1MRK 504 135-UEN A
Section 2
Available functions
35
Technical manual
Summary of Contents for ret650
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