Corona and Electric Field Distribution Analysis in 400 kV Line Insulators

Abstract

The performance of insulator strings in transmission lines can be improved by corona rings owing to their electric field grading property. The insulation performance of the string depends on the corona ring parameter settings. In this study, the design of a corona ring for a 400 kV non-ceramic overhead line insulator is presented. Two parameters were altered during the investigation, ring measurement (R) and ring tube breadth (r) while maintaining a constant ring height (h). Based on electric field distribution, the proposed composite insulators were compared with glass insulators. Simulation studies were performed for the insulator strings, including corona rings with different design parameters. The corona discharge and optimal configuration results were analyzed, and it was found that the electric field was lower with composite insulators.

Design of an Anti-Corona Device for HVAC Substation Connectors

“…The phenomenon corresponds to a discharge at the point where the electric field is greater than the disruptive strength of the insulation that surrounds the surface of the conductor and has several physical aspects, such as sound, luminance, and electromagnetic pulse waves that produce energy losses on the transmission system [1]. In the worst case, a corona effect could develop into an arc that causes the destruction of electric devices installed in overhead lines, such as insulators or connectors [2,3].…”