Objective methods to interpret partial-discharge data on rotating-machine stator windings
Objective methods to interpret partial-discharge data on rotating-machine stator windings
复制标题
解释旋转电机定子绕组局部放电数据的客观方法
DOI：
10.1109/tia.2005.861273
复制
发表时间：
2006
影响因子：
4.4
通讯作者：
V. Warren
中科院分区：
文献类型：
--
作者：
Greg C Stone;V. Warren
长期以来，局部放电（PD）测量一直用于评估额定电压为3.3 kV及以上的电动机和发电机的电气绝缘状况。在电动机或发电机的正常服务期间，有许多方法可以测量PD。不幸的是，大多数测量方法将定子局部放电与来自不良电气连接、电动工具操作、输电线路电晕等的电干扰信号混合在一起。结果可能是定子绕组问题的错误指示，降低了局部放电测量的置信度。在线PD测试的另一个问题是解释，即，确定哪些机器处于良好状态，哪些机器需要维护。在过去十年中，已收集了超过60 000个测试结果的数据库。在数百台机器中，通过目视检查确定的绝缘状况已与PD水平进行了比较。其结果是一个表格，提供了一个客观的手段，确定定子绝缘条件相对于其他类似的机器。结果的分析还表明，制造商之间的PD活动存在显着差异。本文综述了可以降低错误指示风险的方法，从而使测量不那么主观。
Partial-discharge (PD) measurements have long been used to assess the condition of the electrical insulation in motors and generators rated 3.3 kV and above. There are many ways to measure PDs during normal service of the motor or generator. Unfortunately most of the measurement methods mix stator PD with electrical-interference signals from poor electrical connections, power tool operation, corona from transmission lines, etc. The result can be false indications of stator-winding problems, reducing confidence in PD measurements. Another issue with online PD testing is interpretation, i.e., identifying which machines are in good condition and which machines need maintenance. In the past decade, a database of over 60 000 test results has been assembled. In hundreds of machines, the condition of the insulation determined by a visual inspection has been compared to the PD levels. The result is a table that provides an objective means of determining the stator-insulation condition relative to other similar machines. An analysis of the results also shows that there are significant differences in PD activity between manufacturers. This paper gives a review of the methods that can reduce the risk of false indications, thus making the measurement less subjective.