大型自耦变压器和换流变压器局部放电脉冲特征及实例分析

多台大型自耦变压器和换流变压器的试验结果表明,采用带模拟信号重构(数字信号处理)的数字局部放电测试仪,宽频带测量,深入分析局部放电脉冲的特征,结合“多端子测量和校正”,对判断放电的部位有较好的效果。局部放电脉冲的特征包括各端子的传递比,极性和脉冲震荡现象等特征,并结合与相应端子间的方波校正比较,能够较准确判断放电部位,并得到变压器解体的证实。

Characterization and Examples Analysis of Partial Discharge Pulses in Large Autotransformers and HVDC Transformers

The practices of several large autotransformers and HVDC transformers make clear that the good results are obtained for determining of PD locations.The digital PD instruments are used and there are digital signal processing and phase synchronization functions and using wide frequency band measurement.The calibration and measurement method are used also on multi terminals of the transformer.The characterizations of the partial discharge pulses are included that the transmission ratio of pulse magnitude on the terminals of the transformer,the pules polarity and pulses oscillation phenomena and so on.In-depth analysis of PD pulse characteristics and combined with"multi-terminal measurement and calibration",the information of about PD location determined.The PD locations determined are confirmed by the inside check or disintegration of the transformers.