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
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