ABB Relion 670 series REC670 Product Manual

Also see for RED670 Relion 670 series: Installation manual Installation manual Commissioning manual Product guide Technical reference manual

Contents

ABB Relion 670 series REC670 Product Manual Manual pdf 15 page image

Single command, 16 signalsThe IEDs can receive commands either from a substationautomation system or from the local HMI. The commandfunction block has outputs that can be used, for example, tocontrol high voltage apparatuses or for other user definedfunctionality.10. Scheme communicationScheme communication logic for distance or overcurrentprotection ZCPSCHTo achieve instantaneous fault clearance for all line faults,scheme communication logic is provided. All types ofcommunication schemes for example, permissiveunderreaching, permissive overreaching, blocking,unblocking, intertrip are available.The built-in communication module (LDCM) can be used forscheme communication signaling when included.Current reversal and weak-end infeed logic for distanceprotection ZCRWPSCHThe current reversal function is used to prevent unwantedoperations due to current reversal when using permissiveoverreach protection schemes in application with parallel lineswhen the overreach from the two ends overlap on the parallelline.The weak-end infeed logic is used in cases where theapparent power behind the protection can be too low toactivate the distance protection function. When activated,received carrier signal together with local undervoltage criteriaand no reverse zone operation gives an instantaneous trip.The received signal is also echoed back during 200 ms toaccelerate the sending end.Three phase or phase segregated scheme logic is available.Local acceleration logic ZCLCPLALTo achieve fast clearing of faults on the whole line, when nocommunication channel is available, local acceleration logic(ZCLCPLAL) can be used. This logic enables fast faultclearing during certain conditions, but naturally, it can notfully replace a communication channel.The logic can be controlled either by the autorecloser (zoneextension) or by the loss-of-load current (loss-of-loadacceleration).Scheme communication logic for residual overcurrentprotection ECPSCHTo achieve fast fault clearance of earth faults on the part ofthe line not covered by the instantaneous step of the residualovercurrent protection, the directional residual overcurrentprotection can be supported with a logic that usescommunication channels.In the directional scheme, information of the fault currentdirection must be transmitted to the other line end. Withdirectional comparison, a short operate time of the protectionincluding a channel transmission time, can be achieved. Thisshort operate time enables rapid autoreclosing function afterthe fault clearance.The communication logic module for directional residualcurrent protection enables blocking as well as permissiveunder/overreaching schemes. The logic can also besupported by additional logic for weak-end infeed and currentreversal, included in Current reversal and weak-end infeedlogic for residual overcurrent protection (ECRWPSCH)function.Current reversal and weak-end infeed logic for residualovercurrent protection ECRWPSCHThe Current reversal and weak-end infeed logic for residualovercurrent protection ECRWPSCH is a supplement toScheme communication logic for residual overcurrentprotection ECPSCH.To achieve fast fault clearing for all earth faults on the line, thedirectional earth-fault protection function can be supportedwith logic that uses communication channels.The 670 series IEDs have for this reason available additions toscheme communication logic.If parallel lines are connected to common busbars at bothterminals, overreaching permissive communication schemescan trip unselectively due to fault current reversal. Thisunwanted tripping affects the healthy line when a fault iscleared on the other line. This lack of security can result in atotal loss of interconnection between the two buses. To avoidthis type of disturbance, a fault current reversal logic(transient blocking logic) can be used.Permissive communication schemes for residual overcurrentprotection can basically operate only when the protection inthe remote IED can detect the fault. The detection requires asufficient minimum residual fault current, out from this IED.The fault current can be too low due to an opened breaker orhigh-positive and/or zero-sequence source impedancebehind this IED. To overcome these conditions, weak-endinfeed (WEI) echo logic is used.11. LogicTripping logic SMPPTRCA function block for protection tripping is provided for eachcircuit breaker involved in the tripping of the fault. It providesa settable pulse prolongation to ensure a trip pulse ofsufficient length, as well as all functionality necessary forcorrect co-operation with autoreclosing functions.The trip function block also includes a settable latchfunctionality for evolving faults and breaker lock-out.Bay control REC670 1MRK511232-BEN EPre-configuredProduct version: 1.2ABB 15