Environmental influence on corona inception with HVDC application

Summary

The corona inception voltage can be defined as the lowest voltage at which continuous corona discharge of specified pulse amplitude occurs as the applied voltage is gradually increased. Corona discharge is one of important problems in the design and operation of transmission lines. It is a well-known phenomenon that can cause damage and losses in a transmission or power system. A laboratory corona cage is a tool used to determine the corona performance of the conductors, with a concentric metal cage with large radius, whose section form is circular or square with a test line at its centre to simulate a single/multiple (bundle) conductor(s). This paper shows the corona inception voltages measured in a corona cage in Vaal University Technology high voltage laboratory for the positive and negative HVDC application. The main aims of these measurements are to investigate and present an overall picture of corona discharge performance and the influence of temperature, wind or air pressure on the inception voltage in a range which may be of interest to engineers. In the laboratory, the inception voltage test platform is build up to measure the positive and negative corona inception voltages under different temperature and wind pressure. This analysis clearly demonstrates the environmental impact (temperature and wind variations) on the corona inception voltage.

Additional informations

Authors

Carré

Keywords

HVDC, Partial Discharge, Corona Cage, Environment impact, Inception Voltage