【摘要】 对开关柜进行局部放电在线监测及定位,可以及时发现故障及隐患,对巡检人员做进一步检修具有指导意义。特高频法用于高压开关柜在线监测具有检测频率高、外界干扰信号小等优点,但目前在开关柜局部放电检测与定位中仍存在设备通道数量受限、不能同时监测多面开关柜的问题。为此提出一种新型的线性阵列式UHF传感器开关柜局部放电在线监测方法,采用线性阵列方式实现同时对多面开关柜进行局部放电检测,并运用包络检波对局部放电信号进行频谱搬移,实现双通道数据采集功能。实验显示该方法对局部放电信号的最大定位误差为13.4cm,平均定位误差为8.1cm,在满足对多面开关柜局部放电检测与定位的同时具有良好的可扩展性与经济性。更多还原

【Abstract】 On-line partial discharge monitoring and positioning of the switchgear can detect faults and hidden dangers in time,which is of guiding significance for inspection personnel to perform further maintenance. The UHF method used for online monitoring of high voltage switchgear has obvious advantages such as high detection frequency and small external interference signals. However,the UHF method still has the problem that the number of equipment channels is limited in the partial discharge detection and positioning of the switchgear,and the multi-sided switchgear cannot be monitored at the same time. Based on this,propose a new linear array UHF sensor switchgear partial discharge online monitoring method. The linear array method is adopted to realize the simultaneous partial discharge detection of the multi-sided switchgear,and the envelope detection is used to shift the spectrum of the partial discharge signal to realize the function of dual-channel data acquisition. Experiments show that the maximum positioning error of this method for partial discharge signals is 13.4 cm,and the average positioning error is 8.1 cm. This method not only satisfies the detection and positioning of partial discharge in multi-sided switchgear,but also has good scalability and economy.更多还原