CAJ | 학술논문

开关设备运行过程中产生的暂态电磁干扰对二次电子装置的稳定运行有重要的影响。针对目前开关柜电磁干扰信号特征不明确，二次回路抗干扰能力不足的问题，提出了一种利用合成试验回路和光栅隔离采集系统进行不同运行环境下电磁干扰信号采集，利用db小波分析方法对干扰信号进行数学处理并提取出暂态电磁干扰的主要频带及能量分布的方法。研究表明：随着断路器开断电流数值的提升，由开断造成的电磁干扰呈现逐渐增强的态势，干扰电磁波频段为d4小波和d5小波所在的7.8125~31.25MHz频段。为下一步研究暂态电磁干扰抑制方法，提升二次电子装置的电磁抗干扰水平打下了基础。
개관설비운행과정중산생적잠태전자간우대이차전자장치적은정운행유중요적영향。침대목전개관거전자간우신호특정불명학，이차회로항간우능력불족적문제，제출료일충이용합성시험회로화광책격리채집계통진행불동운행배경하전자간우신호채집，이용db소파분석방법대간우신호진행수학처리병제취출잠태전자간우적주요빈대급능량분포적방법。연구표명：수착단로기개단전류수치적제승，유개단조성적전자간우정현축점증강적태세，간우전자파빈단위d4소파화d5소파소재적7.8125~31.25MHz빈단。위하일보연구잠태전자간우억제방법，제승이차전자장치적전자항간우수평타하료기출。
Transient electromagnetic interference generated in the process of switch equipment running exerts a great influence on the stable operation of the secondary electronic device. To tackle such issues as the ambiguity of the switchgear electromagnetic interference signal characteristics and the inadequacy of secondary circuit noise im-munity competence, the paper proposed a method of using synthetic test circuit and raster isolation acquisition sys-tem to collect electromagnetic interference signals under different operating environments, which was analyzed using wavelet to process interference signals mathematically and to extract the transient electromagnetic interference and the energy distribution of the main band. The results indicate that with the upgrading of the current value of the cir-cuit, electromagnetic interference tend to increase gradually, the electromagnetic interference band being between d4 wavelet 31. 25 MHz and d5 wavelet 7. 8125 MHz. The study lays the foundation for further study of the transient electromagnetic interference mitigation methods to enhance the electromagnetic immunity level of secondary elec-tronic devices.