Research of AC Superposition Method Applied in the Hot-Line Test for the Insulation Performance of XLPE Cable
ZHOU Zhicheng1, HE Junjia1, ZHANG Hong2, CHEN Junwu1, ZHOU Yafei3 (1. Huazhong University of Science & Technology, Wuhan 430074, China; 2. Shayang Department of Electric Power, Hubei; 3. Huaihua Department of Electric Power, Huaihua 418000, China)
To avoid the difficulty of detection by DC com ponent method, DC superposition method or low-frequency superposition for the i nsulation performance of XLPE cable, bases on the theoretic analysis of AC super position method, this paper analyzes the detecting principle of 101 Hz signal an d proves that AC superposition method has the merits of high sensitivity, strong anti-interference and on-line detecting. Detecting instrument is designed by adopting the method of multi digital filter and FFT to eliminate the locate inte rference and voltage shift of electron parts. The site test results show the agr eement with the practical data and prove that the method can judge the insulatio n performance of XLPE cable.
【CateGory Index】： TM247.1