전자통신설비의 SPD 소손사례 및 열화진단기법 분석

Survey of Damage Cases for Surge Protective Devices Installed Electrical Communication Systems and Analysis of Degradation Diagnosis Method

In recent years electric devices and telecommunication facilities were often damaged by surge generated lightning discharge. When the service was interrupted by failure of electrical devices due to surge the social loss is very enormous. Therefore in order to protect electrical systems against lightning, SPDs(Surge protective device) have been used But damaged SPDs often make some troubles like fire and interrupt of service. In this work, 3rd harmonic leakage current defection method was applied as the diagnosis of SPD degradation and the effectiveness of this method was verified by field survey.