2.2
Back-up protection functions
IEC 61850 or
Function name
ANSI
Function description
Generator
REG650
REG650 (B01) Gen diff
REG650 (B05) Gen+Trafo diff
Current protection
OC4PTOC
51/67
Four step phase overcurrent protection, 3-phase output
0–2
2
2
EF4PTOC
51N/67N
Four step residual overcurrent protection, zero/negative
sequence direction
0–2
2
2
SDEPSDE
67N
Sensitive directional residual overcurrent and power
protection
0–1
1
1
TRPTTR
49
Thermal overload protection, two time constants
0–2
2
2
CCRBRF
50BF
Breaker failure protection, 3–phase activation and output
0–1
1
1
CCRPLD
52PD
Pole discordance protection
0–1
1
1
GUPPDUP
37
Directional underpower protection
0–1
1
1
GOPPDOP
32
Directional overpower protection
0–2
2
2
AEGGAPC
50AE
Accidental energizing protection for synchronous generator
1
1
1
NS2PTOC
46I2
Negative-sequence time overcurrent protection for
machines
1
1
1
VRPVOC
51V
Voltage-restrained time overcurrent protection
1
1
1
Voltage protection
UV2PTUV
27
Two step undervoltage protection
0–1
1
1
OV2PTOV
59
Two step overvoltage protection
0–1
1
1
ROV2PTOV
59N
Two step residual overvoltage protection
0–2
2
2
OEXPVPH
24
Overexcitation protection
0–1
1
1
STEFPHIZ
59THD
100% Stator earth fault protection, 3rd harmonic based
0–1
1
1
Frequency protection
SAPTUF
81
Underfrequency function
0–4
4
4
SAPTOF
81
Overfrequency function
0–4
4
4
SAPFRC
81
Rate-of-change frequency protection
0–2
2
2
Section 2
1MRK 502 049-UEN A
Available functions
14
Commissioning manual