基于阻尼特性分析的跳闸回路抗一点接地误动防护  

Protection Against One-Point Grounding Misoperation in Tripping Circuit Based on Damping Characteristics Analysis

作　　者：李端姣 颜大涵 刘建明 LI Duanjiao;YAN Dahan;LIU Jianming(Guangdong Power Grid Co.,Ltd.,Guangzhou 510080,China)

机构地区：[1]广东电网有限责任公司,广州510080

出　　处：《南方电网技术》2024年第8期99-105,共7页Southern Power System Technology

基　　金：国家自然科学基金资助项目(U22B20118)。

摘　　要：受跳闸线圈、继电器的电阻及电感与直流系统对地电容影响,变电站断路器跳闸回路在发生一点接地后构成RLC二阶电路,一点接地电流的振荡可能导致线圈或继电器误动并引发断路器跳闸。剖析了跳闸回路的组成与发生一点接地的风险,分析了跳闸回路电阻、电容、电感在常规取值范围内对接地电流的影响,并通过粒子群算法优化、多维度变量分析等方法提出了跳闸回路的电阻、电容、电感在保证一点接地不误动情况下的取值范围。论证了进一步规范继电器电阻及电感值、优化继电器动作电流、管控直流系统等效对地电容的必要性,为变电站设备元件选型与直流系统对地电容常态化管控提供了指导参考。Due to the influence of the resistances and inductances of the tripping coil and relay,as well as the grounding capacitance of DC system,the tripping circuit of the substation circuit breaker forms an RLC second-order circuit after a single point of grounding occurs.The oscillation of the grounding current at one-point may cause the coil or relay to trip incorrectly and cause the circuit breaker to trip.The composition of the tripping circuit and the risk of one-point grounding are analyzed,the influences of the resistance,capacitance and inductance of the tripping circuit on the grounding current within the conventional value range are also analyzed,and the value ranges of the resistance,capacitance and inductance of the tripping circuit are proposed under the condition of ensuring that one-point grounding does not misoperate through methods such as particle swarm optimization and multi-dimensional variable analysis.The necessity of further standardizing the resistance and inductance values of relays,optimizing the operating cur⁃rent of relays,and controlling the equivalent grounding capacitance of DC systems is demonstrated,which provides the guidance and reference for the selection of substation equipment components and the normalized control of DC system grounding capacitance.

关 键 词：跳闸回路 RLC二阶电路 一点接地 粒子群优化 继电器 

分 类 号：TM63[电气工程—电力系统及自动化]