2.2 Back-up protection functionsIEC 61850 orFunction nameANSI Function description BayREC650REC650 (A01A)3Ph/1CBAREC650 (A02A)3Ph/1CBABREC650 (A07A)BCABCurrent protectionPHPIOC 50 Instantaneous phase overcurrent protection, 3–phaseoutput0–1 1 1 1OC4PTOC 51/67 Four step phase overcurrent protection, 3-phaseoutput0–1 1 1 1EFPIOC 50N Instantaneous residual overcurrent protection 0–1 1 1 1EF4PTOC 51N/67N Four step residual overcurrent protection, zero/negative sequence direction0–1 1 1 1SDEPSDE 67N Sensitive directional residual overcurrent and powerprotection0–1 1 1 1LCPTTR 26 Thermal overload protection, one time constant,Celsius0–1 1 1 1LFPTTR 26 Thermal overload protection, one time constant,Fahrenheit0–1 1 1 1CCRBRF 50BF Breaker failure protection, 3–phase activation andoutput0–1 1 1 1STBPTOC 50STB Stub protection 0–1 1 1 1CCRPLD 52PD Pole discordance protection 0–1 1 1 1BRCPTOC 46 Broken conductor check 0–1 1 1 1GUPPDUP 37 Directional underpower protection 0–1 1 1 1GOPPDOP 32 Directional overpower protection 0–1 1 1 1DNSPTOC 46 Negative sequence based overcurrent function 0–1 1 1 1Voltage protectionUV2PTUV 27 Two step undervoltage protection 0–1 1 1 1OV2PTOV 59 Two step overvoltage protection 0–1 1 1 1ROV2PTOV 59N Two step residual overvoltage protection 0–1 1 1 1LOVPTUV 27 Loss of voltage check 0–1 1 1 1Frequency protectionSAPTUF 81 Underfrequency function 0–2 2 2 2SAPTOF 81 Overfrequency function 0–2 2 2 2SAPFRC 81 Rate-of-change frequency protection 0–2 2 2 21MRK 511 287-UUS A Section 2Available functions41Technical manual
