ABB REL650 Product Manual

Also see for REL650 series: Technical manual Product guide Product guide Technical manual Commissioning manual

Contents

ABB REL650 Product Manual Manual pdf 21 page image

signal to the remote end, and to block the permissive trippingat the local end. This blocking condition is maintained longenough to ensure that no unwanted operation will occur as aresult of the current reversal.On verification of a weak end infeed condition, the weak endinfeed logic provides an output for sending the receivedteleprotection signal back to the remote sending end andother output(s) for local tripping. For terminals equipped forsingle- and two-pole tripping, outputs for the faulted phase(s)are provided. Undervoltage detectors are used to detect thefaulted phase(s).Local acceleration logic ZCLCPSCH M13823-3 v7To achieve fast clearing of faults on the whole line, when nocommunication channel is available, local acceleration logic(ZCLCPSCH) can be used. This logic enables fast faultclearing and re-closing during certain conditions, butnaturally, it can not fully 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 ECPSCH M13918-4 v11To 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, and unblocking schemes. The logic canalso be supported by additional logic for weak-end infeed andcurrent reversal, included in Current reversal and weak-endinfeed logic for residual overcurrent protection (ECRWPSCH)function.Current reversal and weak-end infeed logic for residualovercurrent protection ECRWPSCH M13928-3 v8The 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 tele-protection channels.This is why the IEDs have available additions to the schemecommunication logic.M13928-6 v2If 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.M13928-8 v5Permissive 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. The weak-end infeed echo islimited to 200 ms to avoid channel lockup.10. LogicTripping logic SMPPTRC M12275-3 v12A function block for protection tripping and general startindication is always provided as a basic function for eachcircuit breaker. It provides a settable pulse prolongation timeto ensure a trip pulse of sufficient length, as well as allfunctionality necessary for correct co-operation withautoreclosing functions.The trip function block includes a settable latch function forthe trip signal and circuit breaker lockout.The trip function can collect start and directional signals fromdifferent application functions. The aggregated start anddirectional signals are mapped to the IEC 61850 logical nodedata model.General start matrix block SMAGAPC GUID-BA516165-96DE-4CD9-979B-29457C7653C0 v3The Start Matrix (SMAGAPC) merges start and directionaloutput signals from different application functions and createsa common start and directional output signal (STDIR) to beconnected to the Trip function.The purpose of this functionality is to provide general startand directional information for the IEC 61850 trip logic datamodel SMPPTRC.Trip matrix logic TMAGAPC M15321-3 v12The trip matrix logic TMAGAPC function is used to route tripsignals and other logical output signals to different outputcontacts on the IED.The trip matrix logic function has 3 output signals and theseoutputs can be connected to physical tripping outputs1MRK 506 384-BEN ALine distance protection REL650 2.2Product version: 2.2.1ABB 21