【摘要】 为消除变压器局部放电对现场测量的干扰,在对绝缘油中局部放电特高频信号频谱特征研究基础上,给出了特高频法测量绝缘油中局部放电的频率范围;为满足实际测量要求,采用包络检波方法对放大后的特高频信号进行降频处理;同时,提出了高频与特高频联合测量方法,用来消除现场局放测量中的干扰。对现场测量数据的处理结果表明,所提出的方法可很好抑制干扰信号。更多还原

【Abstract】 In order to suppress the interferences during the partial discharge measurement for power transformer on-site,the frequency range for PD measurement with ultra high frequency(UHF) method is given,based on the experimental research on spectrum characteristics of UHF signals excited from the partial discharge(PD) origins.The envelope detection technique is adopted to reduce the sampling rate of PD measuring system.In order to suppress the interferences,the combination method of UHF and the high frequency is put forward too.The results show that the method present in the paper can well suppress the interferences.更多还原