摘要
干式空心电抗器是电力系统的重要设备之一,其失效破坏形式主要表现为匝间短路,在电抗器匝间短路故障早期,发出有效预警具有重要意义。干式空心电抗器在健康运行时,电压电流相位差为固定值,匝间短路后相位差随之变化,基于此提出一种相位差变化特性的匝间短路在线监测方法。建立匝间短路场-路耦合模型,根据仿真结果整定匝间短路的相位差变化阈值;采用SOGI-PLL结合apFFT算法实时监测相位差的变化特性;搭建匝间短路在线监测系统,并对其性能进行了测试。结果表明:在线监测系统既能灵敏地发现匝间短路,又能精确地测量相位差,满足了灵敏性和可靠性的要求。研究工作验证了基于电压电流相位差变化的匝间短路监测方法的可行性,并为其实现方法提供了参考。
Dry-type air-core reactor is one of the important equipment in power system,and its failure mode is mainly inter-turn short circuit.It is therefore of great significance to issue effective warning in the early stage of inter-turn short circuit fault.In case of healthy operation of the dry-type air core reactor,the phase difference of voltage and current is a fixed value,and the phase difference changes after inter-turn short circuit.Based on this,a kind of online monitoring method for inter-turn short circuit with phase difference change characteristics is proposed.The field-circuit coupling model of inter-turn short circuit is set up,and the change threshold of phase difference of inter-turn short circuit is set in accordance with the simulation results;SOGI-PLL combined with apFFT algorithm is used to monitor the change characteristics of phase difference in real time.Then,the on-line monitoring system for inter-turn short circuit is set up and its performance is tested.The result shows that the on-line monitoring system can not only find out inter-turn short circuit sensitively,but also measure the phase difference accurately,which meets the requirements of both sensitivity and reliability.The feasibility of inter-turn short circuit monitoring method based on the phase difference change of voltage and current is verified by the research work and a reference for its implementation method is provided.
作者
王智弘
李威
尹旭
吴世宝
朱家运
潘志敏
廖婧
WANG Zhihong;LI Wei;YIN Xu;WU Shibao;ZHU Jiayun;PAN Zhimin;LIAO Jing(State Grid Hunan Extra High Voltage Substation Company,Changsha 410009,China;Substation Intelligent Operation and Inspection Laboratory of State Grid Hunan Electric Power Co.,Ltd.,Changsha 410009,China;China Electric Power Research Institute Co.,Ltd.,Beijing 100192,China)
出处
《电力电容器与无功补偿》
2024年第4期71-78,共8页
Power Capacitor & Reactive Power Compensation
基金
国网湖南省电力有限公司科技项目(5216A321N00D)。
