ABB REL670 Product Manual

Also see for RELION REL670: Installation manual Installation manual Commissioning manual Product guide Communication protocol manual

ABB REL670 Product Manual Manual pdf 25 page image

Table 9. Local HMI functionsIEC 61850 or functionnameANSI DescriptionLHMICTRL Local HMI signalsLANGUAGE Local human machine languageSCREEN Local HMI Local human machine screen behaviorFNKEYTY1–FNKEYTY5FNKEYMD1–FNKEYMD5Parameter setting function for HMI in PCM600LEDGEN General LED indication part for LHMIOPENCLOSE_LED LHMI LEDs for open and close keysGRP1_LED1–GRP1_LED15GRP2_LED1–GRP2_LED15GRP3_LED1–GRP3_LED15Basic part for CP HW LED indication module3. Differential protectionHigh impedance differential protection, single phase HZPDIFHigh impedance differential protection, single phase (HZPDIF)functions can be used when the involved CT cores have thesame turns ratio and similar magnetizing characteristics. Itutilizes an external CT secondary current summation by wiring.Actually all CT secondary circuits which are involved in thedifferential scheme are connected in parallel. External seriesresistor, and a voltage dependent resistor which are bothmounted externally to the IED, are also required.The external resistor unit shall be ordered under IEDaccessories in the Product Guide.HZPDIF can be used to protect tee-feeders or busbars,reactors, motors, auto-transformers, capacitor banks and soon. One such function block is used for a high-impedancerestricted earth fault protection. Three such function blocks areused to form three-phase, phase-segregated differentialprotection.Additional security logic for differential protection LDRGFCAdditional security logic for differential protection (LDRGFC)can help the security of the protection especially when thecommunication system is in abnormal status or for examplewhen there is unspecified asymmetry in the communication link.It helps to reduce the probability for mal-operation of theprotection. LDRGFC is more sensitive than the main protectionlogic to always release operation for all faults detected by thedifferential function. LDRGFC consists of four sub functions:• Phase-to-phase current variation• Zero sequence current criterion• Low voltage criterion• Low current criterionPhase-to-phase current variation takes the current samples asinput and it calculates the variation using the sampling valuebased algorithm. Phase-to-phase current variation function ismajor one to fulfill the objectives of the startup element.Zero sequence criterion takes the zero sequence current asinput. It increases the security of protection during the highimpedance fault conditions.Low voltage criterion takes the phase voltages and phase-to-phase voltages as inputs. It increases the security of protectionwhen the three-phase fault occurred on the weak end side.Low current criterion takes the phase currents as inputs and itincreases the dependability during the switch onto fault case ofunloaded line.The differential function can be allowed to trip as no load is fedthrough the line and protection is not working correctly.Features:1MRK 506 372-BEN -Line distance protection REL670 2.2Product version: 2.2ABB 25