Conductor Temperature Estimation in Full Size Cable by PEA Method

Abstract

Polymer insulated HVDC power cable is being employed for submarine transmission with long distance. Its insulation may produce internal space charge, which cause a distortion of electrical field. Moreover, since the insulation is subjected to a temperature originating from the current in the conductor, space charge can be easily injected to the insulation. In the development process of cables, it is very substantial to prove that no significant space charge is formed. The space charge measurement for full-scale cable is preferable at the final stage of the development. One of non-destruction method for space charge measurement is Pulse Electro-Acoustic (PEA) method. In this study, the equipment for space charge measurement in full size cable was modified to obtain temperature conductor by current transformer (CT) and the space charge distribution was investigated at spesific conductor temperature. By proposed a method, the conductor temperature can be estimated from the signal with PEA method