【摘要】 为了保证避雷器的安全运行,应对其运行状态进行在线监测。通过对各种监测方法研究发现,谐波分析法是最通用的方法。在实际应用中,通过对阻性泄漏电流的修正,以及对采集信号进行快速傅里叶(FFT)变换,能够改善谐波分析法的不足。提出了电流采样系统的结构,对在线监测系统进行了结构和功能设计。在设计过程中考虑到现场实际工作对在线监测系统的功能多样化的要求及工作稳定性的要求,并在现场进行试验监测,监测结果证明达到了预期的效果。更多还原

【Abstract】 It is necessary to monitor the state of ZnO arresters to guarantee their safe operation. The most general way to monitor the state of arresters is harmonic analysis algorithm. The properties of the harmonic analysis method in practical application could be improved by modifying the resistive leakage current when conducting fast Fourier transform(FFT)on the collected signals. The structure of the current sampling system were proposed in this paper. The structure and function of the online monitoring system were designed. In the design process, the requirements for the diversification of the functions of the online monitoring system and the requirements for work stability were taken into account in the actual work on site, and the test was carried out on site. The monitoring results proved that the expected results were achieved.更多还原