Discharge Phenomenon of a 500 kV Double Tension Porcelain Insulator String

doi:10.11930/j.issn.1004-9649.202309036

Abstract

Abstract:

The mechanism of this phenomenon was studied with a double tension porcelain insulator strings in a 500 kV converter station. Experiments including resistance testing and cross-sectional staining were conducted, and a simulation model of double insulator strings was established to obtain the distribution pattern of the space electric field. The result shows that water vapor intrusion into the cement adhesive gap resulted in the resistance decrease of several insulators and the formation of 24 zero-value insulators (20 on the west side and 4 on the east side). The 122kV voltage difference between the strings was the main cause of the inter string discharge.

Key words: double tension porcelain insulator string, zero-value insulator, electric field distribution, discharge between strings

Yang CHENG, Lingzhi XIA, Lei NIU, Wei RUAN, Hao SUN, Xuanhe CAO, Shimin ZHANG. Discharge Phenomenon of a 500 kV Double Tension Porcelain Insulator String[J]. Electric Power, 2024, 57(9): 231-237.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202309036

https://www.electricpower.com.cn/EN/Y2024/V57/I9/231

Figures/Tables 8

Fig.1 Discharge phenomenon between insulator strings

Fig.2 Dye penetration test results of zero-value insulators

Fig.3 Simulation model of double insulator strings

Fig.4 The electric field between the double tension porcelain insulator strings of a 500 kV converter station

Fig.5 Electric field strength at different detection distances

Fig.6 Simulation results of discharge phenomenon between double insulator strings

Fig.7 The influence of zero-value insulator position

Fig.8 The influence of zero-value insulator number

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