Partial Discharge Transmission Characteristics and Measurement Technology for Long-distance Gas Insulated Transmission Line in Tunnel

Abstract

This paper deals with the results of various partial discharge detection tests designed to clarify fundamental characteristics, which were carried out on a real-scale 275kV GIL test line laid through a tunnel, along with a solid partial discharge testing technique for a long-distance GIL.
Where it is required to secure dependable reliability for a long-distance and large-capacity gas-insulated transmission line ( GIL), strict quality control and electrical tests carry serious weight with verifying its integrity, during the construction work.
Among others, “Partial Discharge Detection” is extremely instrumental in examining GIL insulation for defects or damage. But its performance has not yet been fully brought to light, namely, sensitivity to faint signals from incidental partial-discharge. how the detection is influenced by assorted modes of external noise. and whether or not to catch how faint partial discharge signals act in a long-distance transmission line . In particular no dependable partial discharge testing technology was available for long gas-insulated transmission lines.