반도체 스위칭소자와 고정밀 자속센서를 이용한 누전차단기 보조트립장치

As the inactive response characteristics of the existing RCD (Residual Current protective Device) used on low voltage power distribution lines, so control of overload and electric short circuit faults, major causes of electrical fires, are not enough. Therefore this paper is proposed a auxiliary trip apparatus of RCD by using a high precision magnetic flux sensor (namely, reed switch) for the prevention of electrical disasters caused by overload or electric short circuit faults. The sensitive reed switch in the proposed auxiliary trip apparatus exactly detects the increased magnetic flux with the overload or the short current caused by a number of electrical faults, and then rapidly cuts off the existing RCD. The proposed auxiliary trip apparatus of RCD is confirmed the excellent characteristics in response velocity and accuracy in comparison with the conventional circuit breaker through various operation performance analysis.