Partial discharge detection by AE sensors for prefabricated joints for xlpe cables

Abstract

AbstractThis paper describes detection by the AE (acoustic emission) sensor of partial discharge in a prefabricated joint, one of the accessories for XLPE cables which is composed of factory‐formed parts. Since the prefabricated joints can be installed in a short time, an increasing number of such joints has been used on power transmission lines. However, the interface between the parts of prefabricated joints tends to exhibit weak points because of a structure peculiar to this type of joint.The AE sensor is provided for practicability in comparison with conventional electrical defect detection methods. In the course of the present study, a method for locating a defect using multiple signals from the AE sensors was developed and its validity was evaluated by the dielectric breakdown test.