电磁式漏电保护特性影响因素分析及其稳健性设计  

Factors Analysis and Robust Design of Electromagnetic Leakage Protection Characteristics

作　　者：李奎[1,2] 徐子健 卢志伟 武一[1] 胡博凯 Li Kui;Xu Zijian;Lu Zhiwei;Wu Yi;Hu Bokai(State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology,Tianjin,300130 China;Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology,Tianjin,300130 China)

机构地区：[1]省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学),天津300130 [2]河北工业大学河北省电磁场与电器可靠性重点实验室,天津300130

出　　处：《电工技术学报》2023年第14期3930-3942,共13页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51977059);河北省自然科学基金(E2020202042)资助项目。

摘　　要：电磁式漏电保护是一种重要的漏电故障保护技术,其漏电保护特性受元器件参数影响大,导致批量生产工艺要求高、生产成本较高。该文针对电磁式漏电保护特性不稳定性问题开展研究。首先,分析漏电检测电路的工作原理,确定剩余电流互感器与补偿电容、补偿电阻之间的耦合关系;其次,分析剩余电流互感器铁心磁参数与漏电检测电路参数对漏电保护特性的影响,为剩余电流互感器及漏电检测电路的参数匹配设计提供依据;最后,分析补偿电容容差与剩余电流互感器铁心磁参数分散性对漏电保护特性稳健性的影响,确定铁心材料磁参数与漏电检测电路参数的匹配关系,进行剩余电流互感器及漏电检测电路参数的匹配设计,降低了元器件参数分散性对漏电保护特性的影响。Electromagnetic leakage protection is an important leakage fault protection technology greatly influenced by component parameters and requires high requirements for the batch production process,resulting in high production costs.The problem of instability of electromagnetic leakage protection characteristics is studied to improve its robustness and to solve the constraints of batch production of electromagnetic leakage protectors.Electromagnetic leakage protection characteristics,such as leakage operating current and operating time,depend on the parameters of the residual current transformer and its matching resistance and capacitance.If the leakage operating current is a specific value,the matching relationship curve of R1 and C1 is like the letter“U”.As C1 increases,the operating time tC increases and then decreases.The maximum value of operating time tC appears around the resonant capacitor,increasing with the increase of resonant capacitance.The inductance varies for different residual current transformer core magnetic parameters,resulting in different resistance and capacitance to be matched.However,the shape of the curve for the matching relationship between resistance and capacitance is the same,simply shifting on the axis,as shown in Fig.A1a,with a similar variation in the operating time tC,as shown in Fig.A1b.Although different compensation capacitors C1 are available to meet the requirements of the leakage protection characteristics,the stability of the characteristics varies.The leakage protection characteristics are robust if C1 is smaller than the resonant capacitance,and the tolerance of C1 has less effect on it.At the same time,the leakage protection characteristics are also influenced by the magnetic parameters of the residual current transformer core,such as Bs,Br,and Hc.The stability of the leakage protection characteristics varies under different Bs,Br,and Hc,with Br and Hc having a large impact and Bs having a small impact.For the same value of compensation capacitance,there is a lower lim

关 键 词：电磁式漏电保护 剩余电流互感器 漏电保护特性 稳健性 参数匹配设计 

分 类 号：TM561[电气工程—电器]