Influential Factors of Voltage Sharing for Series Multi-break Fast Mechanical Switch of ±500 kV Hybrid HVDC Circuit Breaker

QUAN Wanlin; HUANG Daochun; WANG Xuezong; LI Guannan; QIU Zhibin; YANG Qiuyu

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Influential Factors of Voltage Sharing for Series Multi-break Fast Mechanical Switch of ±500 kV Hybrid HVDC Circuit Breaker

更新时间：2025-12-08

- Influential Factors of Voltage Sharing for Series Multi-break Fast Mechanical Switch of ±500 kV Hybrid HVDC Circuit Breaker
- Vol. 46, Issue 8, Pages: 2706-2713(2020)
- 作者机构：
  
  武汉大学电气与自动化学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 August 2020，
  
  Published：2020
- 稿件说明：
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QUAN Wanlin, HUANG Daochun, WANG Xuezong, et al. Influential Factors of Voltage Sharing for Series Multi-break Fast Mechanical Switch of ±500 kV Hybrid HVDC Circuit Breaker[J]. 2020, 46(8): 2706-2713.
DOI：

QUAN Wanlin, HUANG Daochun, WANG Xuezong, et al. Influential Factors of Voltage Sharing for Series Multi-break Fast Mechanical Switch of ±500 kV Hybrid HVDC Circuit Breaker[J]. 2020, 46(8): 2706-2713. DOI：

摘要

高压直流断路器是高压直流电网的关键设备。混合式直流断路器主支路中的高速机械开关采用多个断口串联的形式以满足速动性要求

选取合适的均压组件参数可有效保证机械开关满足静动态耐压需求。但其在实际运行中可能受到多种因素的影响

并且相关的研究成果较少。以拟用于组成张北四端柔直电网工程中±500 kV混合式直流断路器的550 kV串联六断口高速机械开关为研究对象

通过3维有限元模型计算了其电位分布特性及分布电容参数

建立等值阻容网络模型研究了单断口故障不动作、断口动作时间分散性、装设屏蔽金具等因素对均压组件参数配置的影响。研究结果表明:单断口故障不动作及动作时间分散性对均压组件参数配置影响很小;装设屏蔽金具对均压有较小的正面影响;最终需要综合各因素进行参数校核。研究结果可为实际工程中无弧分断形式的串联多断口机械开关均压设计提供参考。

Abstract

HVDC circuit breakers are the key protection equipment for HVDC power grids. In the main branch of hybrid HVDC circuit breaker

the fast mechanical switch adopts the form of series multi-break to ensure the requirement of operating rapidity. Choosing appropriate voltage-sharing component parameters is an important guarantee for the fast mechanical switch to meet the static and dynamic voltage withstand property. But it may be affected by many factors in actual operation

and the concerned research results are few. Taking the series six-break 550 kV fast mechanical switch as an example

which makes up the ±500 kV hybrid HVDC circuit breaker in the Zhangbei four-terminal DC grid

the voltage distribution characteristics and distributed capacitance parameters were simulated by the three-dimensional finite element model. The influence of the factors on the voltage-sharing components’ parameters

including single-break fault

asynchronous breaking

and the influence of shield fittings

were simulated. The research results show that

single-break fault and asynchronous breaking have a little effect on the configuration of voltage-sharing

the influence of the shield is positive but small. And the parameter check considering multiple factors is required finally. The research results can provide guidance for the voltage sharing design of series multi-break no-arc fast mechanical switch.

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