地面检测零值绝缘子中抗干扰措施的研究

NOISES ELIMINATING IN DETECTING FAULTY INSULATORS ON OVERHEAD LINE ON GROUND

大量研究结果表明,输电线路上的零值绝缘子可以通过流经杆塔接地线的绝缘子电晕脉冲信号检测出来。但是,接地线上有许多干扰,如果不消除它们,绝缘子电晕脉冲很难测到。提出了用于消除泄漏电流、谐波和电力载波等周期性干扰的高频传感器系统,而且着重讨论了用基于脉冲统计特性的模式识别方法区分绝缘子电晕与金具、导线电晕的可行性,并提出了几条识别准则。最后,分析了实际线路检测情况。其检测结果比较准确,有力地证实了上述方法极其有效和实用。

Based on some research results, insulator corona pulses through the ground line of the tower could be used to identify faulty insulators on transmission lines. But there are many noises in ground lines, which make it difficult to detect insulator corona pulses. Some methods of discriminating insulator corona pulses form these noises are described in this paper. A high frequency sensor with a filter is used to eliminate periodic noises, such as leakage current, harmonic and carrier. A method of distinguishing insulator corona pulse from other kind of noises such as HV line corona and line clip corona using pattern identification based on pulse statistic characteristics is put forward. It抯 feasibility and effect is also discussed completely by field results. These excellent effects of above methods have proved that these methods are very efficacious and useful.