SettSendMin = 0.1 s (0 s in parallel line applications)SetUnblock =OffSettSecurity = 0.015 s16.2 Phase segregated scheme communication logic fordistance protection ZC1PPSCH SEMOD141690-1 v216.2.1 IdentificationSEMOD141699-2 v2Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberPhase segregated Schemecommunication logic for distanceprotectionZC1PPSCH - 8516.2.2 Application SEMOD141787-1 v1SEMOD141790-4 v2To achieve fast fault clearing for a fault on the part of the line not covered by theinstantaneous zone1, the stepped distance protection function can be supportedwith logic that uses communication channels.For the Phase segregated scheme communication logic for distance protection(ZC1PPSCH) three channels in each direction, which can transmit an on/off signalis required.The performance and security of this function is directly related to the transmissionchannels speed, and security against false or lost signals. Special communicationchannels are used for this purpose. When power line carrier is used forcommunication, these special channels are strongly recommended due to thecommunication disturbance caused by the primary fault.Communication speed, or minimum time delay, is always of utmost importancebecause the purpose for using communication is to improve the total tripping speedof the scheme. To avoid false signals that could cause false tripping, it is necessaryto pay attention to the security of the communication channel. At the same time, itis important pay attention to the communication channel dependability to ensurethat proper signals are communicated during power system faults, the time duringwhich the protection schemes must perform their tasks flawlessly.The logic supports the following communications schemes:• blocking scheme• permissive schemes (overreach and underreach)• direct intertrip1MRK 506 369-UEN B Section 16Scheme communicationLine distance protection REL670 2.2 IEC 709Application manual
