ABB REC670 2.1 IEC Product Manual

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ABB REC670 2.1 IEC Product Manual Manual pdf 26 page image

and re-closing during certain conditions, but naturally, it cannot 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 v10To 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 ECRWPSCHfunction.Current reversal and weak-end infeed logic for residualovercurrent protection ECRWPSCH M13928-3 v7The 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.11. LogicTripping logic SMPPTRC M12275-3 v10A function block for protection tripping is always provided asbasic for each circuit breaker involved in the tripping of thefault. It provides a settable pulse prolongation to ensure a trippulse of sufficient length, as well as all functionality necessaryfor correct co-operation with autoreclosing functions.The trip function block also includes a settable latchfunctionality for evolving faults and breaker lock-out.Trip matrix logic TMAGAPC M15321-3 v11The 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 outputsaccording to the specific application needs for settable pulseor steady output.Group alarm logic function ALMCALHGUID-16E60E27-F7A8-416D-8648-8174AAC49BB5 v3The group alarm logic function ALMCALH is used to routeseveral alarm signals to a common indication, LED and/orcontact, in the IED.Group warning logic function WRNCALHGUID-F7D9A012-3AD4-4D86-BE97-DF2A99BE5383 v3The group warning logic function WRNCALH is used to routeseveral warning signals to a common indication, LED and/orcontact, in the IED.Group indication logic function INDCALHGUID-D8D1A4EE-A87F-46C6-8529-277FC1ADA9B0 v3The group indication logic function INDCALH is used to routeseveral indication signals to a common indication, LED and/orcontact, in the IED.Basic configurable logic blocks M11396-4 v15The basic configurable logic blocks do not propagate the timestamp and quality of signals (have no suffix QT at the end oftheir function name). A number of logic blocks and timers arealways available as basic for the user to adapt theconfiguration to the specific application needs. The list belowshows a summary of the function blocks and their features.These logic blocks are also available as part of an extensionlogic package with the same number of instances.• AND function block. Each block has four inputs and twooutputs where one is inverted.• GATE function block is used for whether or not a signalshould be able to pass from the input to the output.1MRK 511 361-BEN BBay control REC670 2.1 IECProduct version: 2.126 ABB