Defect and Improved Method of DC Wall Bushing Design in ±800 kV UHVDC Transmission Project

ZHANG Qihao; WU Deguan; MA Zhenglin

doi:10.13296/j.1001-1609.hva.2019.04.034

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Defect and Improved Method of DC Wall Bushing Design in ±800 kV UHVDC Transmission Project

更新时间：2025-04-26

- Defect and Improved Method of DC Wall Bushing Design in ±800 kV UHVDC Transmission Project
- High VoltageApparatus Vol. 55, Issue 4, Pages: 239-244(2019)
- 作者机构：
  
  1. 中国南方电网超高压输电公司昆明局
  2. 中国南方电网超高压输电公司检修试验中心
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2019.04.034
  CLC： TM216.5
- Published：2019
- 稿件说明：
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[1]张启浩,吴德贯,马正霖.±800 kV特高压直流输电工程直流穿墙套管设计缺陷及其改进方法[J].高压电器,2019,55(04):239-244.

ZHANG Qihao, WU Deguan, MA Zhenglin. Defect and Improved Method of DC Wall Bushing Design in ±800 kV UHVDC Transmission Project[J]. High voltageapparatus, 2019, 55(4): 239-244.
[1]张启浩,吴德贯,马正霖.±800 kV特高压直流输电工程直流穿墙套管设计缺陷及其改进方法[J].高压电器,2019,55(04):239-244. DOI： 10.13296/j.1001-1609.hva.2019.04.034.

ZHANG Qihao, WU Deguan, MA Zhenglin. Defect and Improved Method of DC Wall Bushing Design in ±800 kV UHVDC Transmission Project[J]. High voltageapparatus, 2019, 55(4): 239-244. DOI： 10.13296/j.1001-1609.hva.2019.04.034.

摘要

2011～2016年期间

运用在±800kV直流输电工程中的某类型直流穿墙套管先后6次发生故障

暴露出其在电气连接方面的一系列设计缺陷:均压罩等电位接触不良、表带触指接触电阻过大等。结合直流穿墙套管SF6分解产物超标、内部闪络、回路电阻超标、接头发热案例深入分析了直流穿墙套管故障的原因

总结了增加防松螺钉、等电位线、O型密封圈、接头镀银等改进措施

提出了增加等电位连接可靠性、保证通流裕度的直流穿墙套管设计建议

并提出重视SF6分解产物测试、增加回路电阻测试的运维建议。

Abstract

DC wall bushing of certain type in ±800 kV UHVDC transmission projection successively malfunctioned six times

and exposing a series of design defects in its electrical design such as the bad contact of the equipotential shield electrode or the band connector

and so on. The paper deeply analyses fault causes of DC wall bushing through cases of SF

breakdown products over proof

internal flashover

loop resistance over proof

connector overheating.Improved methods such as increasing the locking screws

equipotential wires

seal rings and plating connector with silver are summarized. Design proposals of DC wall bushing such as increasing the reliability of equipotential connector and ensuring the current margin are proposed. The pap

er proposes the suggestions for operation and maintenance of paying more attention to SF

breakdown products and increasing the loop resistance test.

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