Title :
Research on the exterior electric field of the ultrahigh voltage post insulator under impulse voltage
Author :
Yunfeng Xia ; Xiyang Chen ; Jianhua Lin ; Xiaoyou Guo ; Chuanxu Wang ; Chuangrong Yin
Author_Institution :
Dongguan Power Supply Bur. of Guangdong Grid, Dongguan, China
Abstract :
Higher technical requirements of post insulator for Ultra-high Voltage (UHV) transmission and transformation project have been proposed. The polluted post insulators on service may flashover as a result of lightning. The electrical field and potential distribution of the post insulator have relations with the flashover. In order to study the character of exterior electric field distribution in UHV post insulator, a finite element computation model is set up by theory analysis. The electric field distribution of 1100kV post insulator for substation operated in standard lightning impulse is computed. Research result can be achieved that the electric field distribution curve changed with time is similar to the excitation source of thunder. The electric field of the first and the last big or small umbrella is large, and the middle umbrella is relative small. The biggest electric field lies in the insulation jacket surface, which is a serious challenge for insulating medium.
Keywords :
electric fields; finite element analysis; flashover; insulator contamination; lightning; UHV post insulator; UHV transmission; exterior electric field distribution; finite element computation model; impulse voltage; insulating medium; insulation jacket surface; polluted post insulators; standard lightning impulse; theory analysis; ultra-high voltage transmission; ultrahigh voltage post insulator; Electric fields; Electrodes; Finite element analysis; Insulators; Lightning; Metals; electric field; finite element; lightning impulse; post insulator; ultra-high voltage;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena (CEIDP), 2013 IEEE Conference on
Conference_Location :
Shenzhen
DOI :
10.1109/CEIDP.2013.6748229