계통 사고시 6.6kV 전동기 모선의 안정적 절체를 위한 계전기 Logic 연구

초록

Recently at many industrial factories, distribution buses for critical loads are installed redundancy system. This system is divided from main Transformer to distribution buses. Generally this bus arrangement is in a incoming-tie-incoming arrangement. If the loss of the power is happened, that bus must be transferred to the alternate bus without damaging the equipment, and ideally, without interrupting the facilities process. This paper explains the conditions for fast transferring without damaging the equipment, without uncontrolled operating in emergency situations. And it describes the relay logic including these conditions and checks the duration time for transferring. The duration time is key of fast transferring without any problem. The system voltage stabilities using this transfer duration time is also included.

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