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 39 page image

Direct transfer trip DTTLow active power and power factor protection LAPPGAPCLow active power and power factor protection (LAPPGAPC)function measures power flow. It can be used for protection andmonitoring of:• phase wise low active power• phase wise low power factor• phase wise reactive power and apparent power as servicevaluesFollowing features are available:• Definite time stage for low active power protection• Definite time stage for low power factor protection• Individual enabling of Low active power and Low powerfactor functions• Low active power trip with 2 selection modes '1 out of 3'and '2 out of 3'• Phase wise calculated values of apparent power, reactivepower, active power and power factor are available asservice values• Insensitive to small variations in voltage and currentCompensated over and undervoltage protection COUVGAPCCompensated over and undervoltage protection (COUVGAPC)function calculates the remote end voltage of the transmissionline utilizing local measured voltage, current and with the help oftransmission line parameters, that is, line resistance, reactance,capacitance and local shunt reactor. For protection of longtransmission line for in zone faults, COUVGAPCcan beincorporated with local criteria within direct transfer trip logic toensure tripping of the line only under abnormal conditions.Sudden change in current variation SCCVPTOCSudden change in current variation (SCCVPTOC) function is afast way of finding any abnormality in line currents. When thereis a fault in the system, the current changes faster than thevoltage. SCCVPTOC finds abnormal condition based on phase-to-phase current variation. The main application is as a localcriterion to increase security when transfer trips are used.Carrier receive logic LCCRPTRCIn Direct transfer trip (DTT) scheme, the received CR signalgives the trip to the circuit breaker after checking certain localcriteria functions in order to increase the security of the overalltripping functionality. Carrier receive logic (LCCRPTRC)function gives final trip output of the DTT scheme.Features:• Carrier redundancy to ensure security in DTT scheme• Blocking function output on CR Channel Error• Phase wise trip outputsNegative sequence overvoltage protection LCNSPTOVNegative sequence components are present in all types of faultcondition. Negative sequence voltage and current get highvalues during unsymmetrical faults.Zero sequence overvoltage protection LCZSPTOVZero sequence components are present in all abnormalconditions involving earth. They can reach considerably highvalues during earth faults.Negative sequence overcurrent protection LCNSPTOCNegative sequence components are present in all types of faultcondition. They can reach considerably high values duringabnormal operation.Zero sequence overcurrent protection LCZSPTOCZero sequence components are present in all abnormalconditions involving earth. They have a considerably high valueduring earth faults.Three phase overcurrent LCP3PTOCThree phase overcurrent (LCP3PTOC) is designed forovercurrent conditions.Features:• Phase wise start and trip signals• Overcurrent protection• Phase wise RMS current is available as service values• Single definite time stage trip function.Three phase undercurrent LCP3PTUCThree phase undercurrent function (LCP3PTUC) is designed fordetecting loss of load conditions.Features:• Phase wise start and trip signals• Phase wise RMS current is available as service values• Single definite time stage trip function14. LogicTripping logic SMPPTRCA function block for protection tripping is always provided asbasic for each circuit breaker involved in the tripping of the fault.It provides a settable pulse prolongation to ensure a trip pulseof sufficient length, as well as all functionality necessary forcorrect co-operation with autoreclosing functions.The trip function block also includes a settable latchfunctionality and circuit breaker closing circuit lockout.The trip function can provide directional data from differentapplication functions. All start and directional outputs aremapped to the logical node data model.1MRK 506 372-BEN -Line distance protection REL670 2.2Product version: 2.2ABB 39