GE MiCOM P40 Agile Technical Manual

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Application Notes P44x/EN AP/Hb6MiCOM P40 Agile P442, P444 (AP) 5-53Trip logic:IEC Standard CarrierSend Trip Logic Application Usersetting448.15.16 POR1 or POP or POTT Z1 Z1.CR.’Aid Dist Delay’ + Z1.T2 + Z2.T2+ Z3.T3... Z1 > ZL POP Z13.2.1.4 Blocking Schemes BOP Z2 and BOP Z1The P442 and P444 relays offer two variants of blocking overreach protection schemes(BOP). With a blocking scheme, the signalling channel is keyed from the reverse lookingzone 4 element, which is used to block fast tripping at the remote line end. Features are asfollows:• BOP schemes require only a simplex signalling channel.• Reverse looking Zone 4 is used to send a blocking signal to the remote end to preventunwanted tripping.• When a simplex channel is used, a BOP scheme can easily be applied to a multi-terminal line provided that outfeed does not occur for any internal faults.• The blocking signal is transmitted over a healthy line, and so there are no problemsassociated with power line carrier signalling equipment.• BOP schemes provide similar resistive coverage to the permissive overreachschemes.• Fast tripping will occur at a strong source line end, for faults along the protected linesection, even if there is weak or zero infeed at the other end of the protected line.• If a line terminal is open, fast tripping will still occur for faults along the whole of theprotected line length.• If the signalling channel fails to send a blocking signal during a fault, fast tripping willoccur for faults along the whole of the protected line, but also for some faults withinthe next line section.• If the signalling channel is taken out of service, the relay will operate in theconventional Basic mode.• A current reversal guard timer is included in the signal send logic to prevent unwantedtrips of the relay on the healthy circuit, during current reversal situations on a parallelcircuit.• To allow time for a blocking signal to arrive, a short time delay on aided tripping, Aideddistribution transmission delay time, must be used, as follows:Recommended ‘Aid Dist Delay’ setting: Max. signalling channel operating time + 14ms3.2.1.4.1 Blocking Overreach Protection with Overreaching Zone 1 (BOP Z1)This scheme is similar to that used in the Alstom Grid EPAC and PXLN relays. Figure 31shows the zone reaches, and Figure 32 the simplified scheme logic. The signalling channelis keyed from operation of the reverse zone 4 elements of the relay. If the remote relay haspicked up in overreaching zone 1, then it will operate after the Transmission Time (‘Distanceschemes / Aid Dist Delay’) time-delay if no block is received.Note: The fastest tripping is always subject to the aided distance time-delay (‘Aid DistDelay’).Send logic: Reverse Zone 4Trip logic: Zone 1, plus Channel NOT Received, delayed by ‘Aid Dist Delay’.