Development of an Online Monitoring System for 750kV Filter Bank Circuit Breakers Based on Transient Current Characteristic Recognition

ZENG Xiwen; ZHANG Min; ZHAO Jingyu; CAI Xu; DENG Junbo

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Development of an Online Monitoring System for 750kV Filter Bank Circuit Breakers Based on Transient Current Characteristic Recognition

POWER CAPACITOR & REACTIVE POWER COMPENSATION

Development of an Online Monitoring System for 750kV Filter Bank Circuit Breakers Based on Transient Current Characteristic Recognition
基于暂态电流特征的750kV滤波器组断路器在线监测系统开发
1.State Grid Corporation of China，Beijing 100192, China
2.Xi'an Jiaotong University, Xi'an 710049, China
(2026)
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ZENG Xiwen, ZHANG Min, ZHAO Jingyu, et al. Development of an Online Monitoring System for 750kV Filter Bank Circuit Breakers Based on Transient Current Characteristic Recognition[J/OL]. Power Capacitor & Reactive Power Compensation, 2026.
DOI：

ZENG Xiwen, ZHANG Min, ZHAO Jingyu, et al. Development of an Online Monitoring System for 750kV Filter Bank Circuit Breakers Based on Transient Current Characteristic Recognition[J/OL]. Power Capacitor & Reactive Power Compensation, 2026. DOI：

摘要

高压交流SF

断路器在特高压直流输电中承担无功补偿与谐波滤除任务，由于电压等级高，投切容量大、交流滤波器组断路器的频繁动作会引起触头烧蚀甚至引发事故。针对某±800kV换流站实际线路配置，利用PSCAD对可能出现的工况进行建模分析，研究了750kV滤波器组断路器合闸电阻阻值对合闸暂态的影响及合闸电阻不同状态下的暂态电流特征，提出合闸电阻状态诊断方法。结果表明，合闸电阻在300Ω-400Ω时在四类滤波器上均表现出良好的综合性能，为主电容过电压、涌流和避雷器过电压提供了较优的抑制效果。通过谐波分析、涌流峰值时刻及三相合闸一致性判据，可有效识别合闸电阻故障。提出动态电阻法结合神经网络、SF

分解组分分析及历史投切数据校正三种电寿命评估方法，动态电阻法预测误差可控制在4%以内。在此基础上开发了合闸电阻在线监测系统，实现了断路器状态的实时评估，为750kV滤波器组断路器合闸电阻的分级运维策略提供了技术支撑。

Abstract

High-voltage AC SF

circuit breakers in ultra-high-voltage DC transmission systems are responsible for reactive power compensation and harmonic filtering. Due to the high voltage level and large switching capacity

frequent operations of AC filter circuit breakers can cause contact erosion and even lead to failures. Based on the actual line configuration of a converter station

this paper uses PSCAD to model and analyze possible operating conditions

investigates the in-fluence of closing resistance on switching transients and the current characteristics under different resistance states

and proposes fault diagnosis methods and electrical life assessment approaches. The results show that a closing resistance in the range of 300–400 Ω provides excellent comprehensive performance across four types of filters

effectively sup-pressing overvoltage across the main capacitor

inrush currents

and arrester overvoltages. By applying criteria such as harmonic analysis

inrush current peak timing

and three-phase closing consistency

faults in the closing resistor can be accurately ident

ified. Three electrical life assessment methods are proposed: the dynamic resistance method combined with neural networks

SF6 decomposition product analysis

and historical switching data correction. The dynamic re-sistance method achieves a prediction error within 4%. A developed online monitoring system enables real-time con-dition assessment of circuit breakers and recommends graded maintenance strategies

providing technical support for enhancing grid reliability.

关键词

Keywords

references

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