Electric Field Analysis and Experimental Study of Defective Basin Insulators Within SF6- Gas-Insulated Current Transformers of 500 kV

doi:10.11930/j.issn.1004-9649.2014.8.27.5

Abstract

Abstract: The number of faults of SF₆-gas-insulated current transformer notably increases in recent years. By analyzing an accident of a 500 kV SF₆ current transformer, it is shown that the cause is the internal defects of the basin insulators in the current transformer during operating. In order to investigate the insulation characteristics of gas-insulated current transformers and find the root causes for the sudden faults, three dimensional electric-field simulations and partial discharge tests based on the accident analysis of SF₆-gas-insulated current transformer with the insulators those have the defects of air bubbles, cracks and sheet metal were carried out. The results illustrate that the electric field of the defective basin insulator is distorted. Especially, in case of metal pollution, the electric field is seriously distorted and partial discharge voltage drops sharply. The investigation data and conclusions provide a theoretical reference for the insulation design, structural optimization, operation maintenance and fault analysis of SF₆-gas-insulated current transformers.

Key words: SF6-gas-insulated current transformer, basin insulator, electric field intensity, finite element method (FEM), discharge capacity, accident analysis, 500 kV

CLC Number:

TM863

HE Da-meng, YAN Nian-ping, WANG Zhong-yi, TONG Jun-xin, MA Jian-cang. Electric Field Analysis and Experimental Study of Defective Basin Insulators Within SF₆- Gas-Insulated Current Transformers of 500 kV[J]. Electric Power, 2014, 47(8): 27-32.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2014.8.27.5

https://www.electricpower.com.cn/EN/Y2014/V47/I8/27

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Electric Field Analysis and Experimental Study of Defective Basin Insulators Within SF₆- Gas-Insulated Current Transformers of 500 kV

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