Agent 기반 변압기의 Sympathetic inrush 판단 방법

Agent based algorithm for detecting sympathetic inrush of a transformer

The protection relay keeps electric power facilities by using signals of the voltage and current which are input and output terminals of each equipment. Each relay performances protection algorithm by using informations of own protecting zone. To prevent the mal-operation in inrush current, established transformer differential protection method uses the second harmonics as blocking signal. This method is not operate at the initial inrush. However, in case of the parallel operation, if the initial inrush is occurred in one transformer which is generated, the sympathetic inrush Is occurred in adjacent transformer. This paper approach the sympathetic inrush detecting algorithm of a transformer based on agent. Proposed algorithm, when inrush current occurred, distinguish sympathetic inrush or not by using differential current of adjacent transformer. This algorithm have the advantage of the distinguishing initial inrush and sympathetic inrush at operation of parallel transformer