Analysis of the Lightning Overvoltage of Substation in Melting Ice Insulated Ground Wire System

doi:10.11930/j.issn.1004-9649.201608030

Abstract

Abstract: The ground wire using full insulation design is employed in the direct current (DC) melting ice technology. But the design of insulated ground wire will affect the largest over-voltage level of electrical equipment in substation. In this paper taking the actual 500 insulated ground wire as an example, the way of erected melting ice insulated ground wire was described. The insulated ground wire simulation model of 500 kV substation was established using ATP-EMTP simulation software. The influence of erection of the melting ice ground wire of 500 kV substation lightning overvoltage was analyzed. The influences law of the lightning-point distance, tower grounding resistance and arrester configuration on the lightning overvoltage of substation equipment were summarized. The results show that the melting ice insulated ground wire has little effects on the largest overvoltage of substation equipment. The closer of the lightning point to the substation is, the greater of over-voltage of substation equipment is. The bus arresters have well protective effects on the substation equipment. The largest overvoltage of substation equipment can be declined by using the bus arresters. The overvoltage level of substation equipment can decrease with the decrease of tower grounding resistance. The results can provide a certain reference to run and design the insulated ground wire in practice.

Key words: EHV AC, DC melting ice, insulated ground wire, substation, lightning over voltage, ATP-EMTP

CLC Number:

TM863

MA Yutang, MA Yi, CAO Xiaobin, HUANG Ran, CHEN Kui, ZHOU Fangrong. Analysis of the Lightning Overvoltage of Substation in Melting Ice Insulated Ground Wire System[J]. Electric Power, 2018, 51(6): 96-101.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201608030

https://www.electricpower.com.cn/EN/Y2018/V51/I6/96

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