2.3 Back-up protection functions
IEC 61850 or
function name
ANSI Function description
REL670 (Customized)
Current protection
PHPIOC 50 Instantaneous phase overcurrent protection 0-3
OC4PTOC
51_67
1)
Directional phase overcurrent protection, four steps 0-3
EFPIOC 50N Instantaneous residual overcurrent protection 0-3
EF4PTOC 51N
67N
2)
Directional residual overcurrent protection, four steps 0-3
NS4PTOC 46I2 Four step directional negative phase sequence overcurrent
protection
0-2
SDEPSDE 67N Sensitive directional residual overcurrent and power protection 0-1
LCPTTR 26 Thermal overload protection, one time constant, Celsius 0-2
LFPTTR 26 Thermal overload protection, one time constant, Fahrenheit 0-2
CCRBRF 50BF Breaker failure protection 0-2
STBPTOC 50STB Stub protection 0-2
CCPDSC 52PD Pole discordance protection 0-2
GUPPDUP 37 Directional underpower protection 0-2
GOPPDOP 32 Directional overpower protection 0-2
BRCPTOC 46 Broken conductor check 1
VRPVOC 51V Voltage restrained overcurrent protection 0-3
Voltage protection
UV2PTUV 27 Two step undervoltage protection 0-2
OV2PTOV 59 Two step overvoltage protection 0-2
ROV2PTOV 59N Two step residual overvoltage protection 0-2
OEXPVPH 24 Overexcitation protection 0-1
VDCPTOV 60 Voltage differential protection 0-2
LOVPTUV 27 Loss of voltage check 1
PAPGAPC 27 Radial feeder protection 0-1
Frequency protection
SAPTUF 81 Underfrequency protection 0-6
SAPTOF 81 Overfrequency protection 0-6
SAPFRC 81 Rate-of-change of frequency protection 0-6
Table continues on next page
Section 2 1MRK 506 369-UUS -
Application
48 Line distance protection REL670 2.2 ANSI
Application manual