变压器局部放电在线检测的现状及发展

Present status and development of PD online monitoring system in power transformer

对变压器局部放电在线检测方面的研究进行了阐述和分析,根据几种不同的局部放电检测方法,从数据的采集、干扰的产生及抑制、局放的定位和局放信号分析等几个方面进行了总结和评价。指出传统的局部放电检测测量频率低、信息量少、易受外界干扰,而超高频测量技术也存在频带窄、检测范围有可能不包含放电特征峰等缺点,超宽频带局部放电检测技术具有测量频率高、频带宽、信息量大等优点,可以较全面地研究局部放电的本质特征,从而揭示了变压器局放在线检测的发展前景和当前的研究重点。

The research on PD online monitoring system in power transformer is expounded. Several PD detecting methods are evaluated by studying data acquiring, noise rejection, PD localization and data analysis. It points out that, traditional PD detection methods have some disadvantages, such as low measured frequency band, less obtained information and easily interfered from background. Ultra-high frequency detection also has several disadvantages such as narrow measured band, and losing some characteristic peaks of discharge. Comparing with traditional and ultra-high frequency of PD detection, ultra-wideband detecting technique with high measured frequency and wide detected band is helpful to obtain much more information. The characteristics of PD can be studied in the range of ultra-wideband in detail. As a result, its prospect and some present research objects are summarized.