变电站工频电磁场对避雷器在线监测装置测量稳定性影响试验研究

Experimental Study on Measurement Stability of Online Monitoring Device for Surge Arrester Under Power Frequency Interference of Electric Field and Magnetic Field in the Substations

避雷器在线监测装置长期处于变电站工频电磁场中,其测量稳定性可能会受到干扰,导致误报警等后果。文中在实验室内利用电磁场发生平台对避雷器在线监测装置施加工频电场/磁场干扰并研究其对测量稳定性的影响。在试验时设置了不同标准源输出、被试设备摆放位置、是否带屏蔽等不同工况。试验结果表明:在工频电场/磁场干扰下,在线监测装置的测量结果稳定性下降,相角波动和全电流幅值波动随着场强的增大而增大。在变电站现场可以采取外加坡莫合金屏蔽层、减小穿心胶棒开口面积等措施来提高避雷器在线监测设备的测量稳定性。本研究可为在实验室中模拟现场试验和在线监测设备抗干扰设计提供依据和参考。

Substation power frequency electromagnetic field has an influence on the measurement stability of online monitoring device for surge arrester. The unstable measurement of the online monitoring device will lead to false alarms and other consequences. This paper uses the electromagnetic field generator in the laboratory to apply power frequency electromagnetic field interference to the arrester online monitoring device to study its measurement stability. During the test,different working conditions such as different standard source output,placement of the tested equipment and whether it is shielded are considered. The test results show that under the interference of power frequency electric field/magnetic field,the stability of the measurement results of the online monitoring device decreases,and the phase angle fluctuation and the full current amplitude fluctuation increase with the increase of the field strength. At the substation,measures such as adding a permalloy shielding layer and reducing the opening area of the through-core glue stick can be taken to improve the measurement stability of the online monitoring equipment.This research can provide a basis and reference for the simulation of field tests and anti-interference design of online monitoring equipment in the experiment.