Fault Analysis and Measures for Light-triggered Thyristor of ±800 kV Chuxiong Converter

MA Xiangnan

doi:10.13296/j.1001-1609.hva.2017.11.038

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Fault Analysis and Measures for Light-triggered Thyristor of ±800 kV Chuxiong Converter

更新时间：2025-04-26

- Fault Analysis and Measures for Light-triggered Thyristor of ±800 kV Chuxiong Converter
- High VoltageApparatus Vol. 53, Issue 11, Pages: 236-245(2017)
- 作者机构：
  
  中国南方电网超高压输电公司昆明局
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2017.11.038
  CLC： TN34;TM721.1
- Published：2017
- 稿件说明：
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[1]马向南.±800kV楚雄换流站光流触发晶闸管故障分析及措施[J].高压电器,2017,53(11):236-245.

MA Xiangnan. Fault Analysis and Measures for Light-triggered Thyristor of ±800 kV Chuxiong Converter[J]. High voltageapparatus, 2017, 53(11): 236-245.
[1]马向南.±800kV楚雄换流站光流触发晶闸管故障分析及措施[J].高压电器,2017,53(11):236-245. DOI： 10.13296/j.1001-1609.hva.2017.11.038.

MA Xiangnan. Fault Analysis and Measures for Light-triggered Thyristor of ±800 kV Chuxiong Converter[J]. High voltageapparatus, 2017, 53(11): 236-245. DOI： 10.13296/j.1001-1609.hva.2017.11.038.

摘要

换流阀是高压直流系统的核心部分

而晶闸管则是换流阀的核心元件

是实现整流和逆变的关键。±800 kV楚雄换流站换流阀采用的是T2563 N80T-S34型光触发晶闸管（light-triggered thyristor

LTT）。LTT具有集成过压保护功能

失效率低。但自2012年4月22日云广直流系统第4阶段孤岛调试结束至5月10日

累计有8只换流阀晶闸管失效。文中针对短时间内多个晶闸管失效这一情况

介绍了±800 kV楚雄换流站换流阀的基本结构和组成元件;阐明了LTT的导通原理和失效机理;结合晶闸管故障情况、晶闸管失效时的系统暂态工况分析、换流阀相关参数对比分析以及避雷器动作分析

总结了造成LTT失效的原因;并提出了解决办法和预防措施。

Abstract

Converter valve is the core part of the HVDC systems

and the thyristor

the core components of the converter valve

is the key to achieve rectifier and inverter.The light-triggered thyristor（LTT）of T2563 N80 T-S34 is used in converter valve at ±800 kV Chuxiong Converter Station.LTT has integrated overvoltage protection function with low failure rate.However

from the 22 nd April

that the stage IV of the island commissioning for Yunguang DC system ended

to the 10 th May in 2012

a total of 8 converter valve thyristor had failed.Taking into account that more than one thyristor failed in a short period of time

in this paper

the author describes the basic structure and the compo-nents of the converter valves for ±800 kV Chuxiong converter station;clarifies the conduction principle and failure mechanism of the LTT;combining with the thyristor failure situation

the system transient work condition analysis

parameters comparative analysis of the converter valve and the action analysis of the arrester

when the thyristor be-come failure

sums up the reason for the failure of LTT

and proposes solutions and preventive measures.

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