Research on DC Component Breaking Capability of SF<sub>6</sub> Circuit Breaker Based on KEMA Arc Model

DING Pei; LIU Zhiyuan; LUO Jinhui; XIANG Bin; XIANG Zhonghua; MA Feiyue; YAO Xiaofei

doi:10.13296/j.1001-1609.hva.2020.12.010

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Research on DC Component Breaking Capability of SF₆ Circuit Breaker Based on KEMA Arc Model

更新时间：2025-04-26

- Research on DC Component Breaking Capability of SF₆ Circuit Breaker Based on KEMA Arc Model
- High VoltageApparatus Vol. 56, Issue 12, Pages: 75-82(2020)
- 作者机构：
  
  1. 国网宁夏电力有限公司电力科学研究院
  2. 西安交通大学电气工程学院电力设备与电气绝缘国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2020.12.010
  CLC： TM561
- Published：2020
- 稿件说明：
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[1]丁培,刘志远,罗金辉,项彬,相中华,马飞越,姚晓飞.基于KEMA电弧模型的SF_6断路器直流分量开断能力研究[J].高压电器,2020,56(12):75-82.

DING Pei, LIU Zhiyuan, LUO Jinhui, et al. Research on DC Component Breaking Capability of SF₆ Circuit Breaker Based on KEMA Arc Model[J]. High voltageapparatus, 2020, 56(12): 75-82.
[1]丁培,刘志远,罗金辉,项彬,相中华,马飞越,姚晓飞.基于KEMA电弧模型的SF_6断路器直流分量开断能力研究[J].高压电器,2020,56(12):75-82. DOI： 10.13296/j.1001-1609.hva.2020.12.010.

DING Pei, LIU Zhiyuan, LUO Jinhui, et al. Research on DC Component Breaking Capability of SF₆ Circuit Breaker Based on KEMA Arc Model[J]. High voltageapparatus, 2020, 56(12): 75-82. DOI： 10.13296/j.1001-1609.hva.2020.12.010.

摘要

电力系统短路电流中直流分量的衰减时间常数超过现有断路器的标准时间常数将导致断路器实际开断能力下降

因此亟需研究直流分量对高压断路器的影响以准确评估其开断能力

防止开断失败造成重大损失。文中提出基于KEMA电弧模型研究SF

断路器直流分量开断能力的方法。首先

将KEMA模型引入直流分量开断仿真中

给出额定开断能力对应的临界电弧参数获取方法

然后使用临界参数仿真实际含更高直流分量的短路电流

最后用该方法验证宁夏电网断路器的实际开断能力。研究结果表明

当断路器的额定开断能力包含20%的直流分量时

气体燃弧的功率升高

临界电弧参数如散热功率常数比不考虑直流分量时大

电弧时间常数比不考虑直流分量时小

因而其能够成功开断实际短路电流。因此

在获得高压SF

断路器的额定开断能力后

可应用该方法评估高压SF

断路器在系统实际直流分量时的开断能力

提高系统的可靠性。

Abstract

In a power system

the time constant of DC component in short circuit current exceeding the standard time constant will cause a decrease in the breaking capacity of the circuit breakers.Therefore

it is necessary to study the effects of DC component on circuit breaker to accurately evaluate its actual breaking capacity and prevent the major losses caused by the failure of the breaking.This paper proposes a method that uses KEMA arc model to obtain the DC component breaking capability of SF

circuit breaker.Firstly

the KEMA arc model is introduc

ed in the simulations of DC component breaking and an algorithm is proposed to search for the arc parameters corresponding to the rated breaking capacity.Then these arc parameters are used to simulate the actual short-circuit current which has a higher DC component.Finally

this method is used to verify the actual breaking capacity of circuit breakers in Ningxia Power Grid.The results show that when the rated breaking capacity contains 20% DC component

the gas arcing power increases

so the cooling power constants of arc model are larger and the time constant is smaller than the corresponding parameters that the DC component in rated breaking current is not considered

and these parameters can break the actual short-circuit currents.Therefore

after obtaining the rated breaking capacity of the SF

circuit breaker

the proposed method can be used to evaluate its breaking capacity with the impact of the actual DC component and improve the reliability of the power systems.

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Research on DC Component Breaking Capability of SF6 Circuit Breaker Based on KEMA Arc Model

DOI：10.13296/j.1001-1609.hva.2020.12.010

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Research on DC Component Breaking Capability of SF₆ Circuit Breaker Based on KEMA Arc Model