变压器局部放电在线检测的地线传感法研究

摘要

On-line partial discharge detection is of great importance for monitoring the operating status of pow-er transformers. A new method for detecting partial discharge of power transformer using ground wire sensing method is proposed, in which only tiny reconstruction of transformer is needed to detect partial discharge. High-frequency band is chosen to acquire higher sensitivity. Computer simulations and experimental tests are used to verify the feasibility of grounding wire sensing method for partial discharge detection of transformers. On the basis above, signals captured by several different structures are analyzed and suggestions are proposed for practical measurement in the future.%局部放电在线检测对监视电力变压器的运行状态具有重要意义。提出了1种检测变压器局部放电的地线传感方法，只需要对变压器进行较小的改造即可进行局部放电检测。选取较高的检测频段，以达到较高的测量灵敏度。通过计算机仿真和实验室试验，验证了该方法用于变压器局部放电检测的可行性。在此基础上对多种不同结构进行检测试验，分析了实际检测得到的信号特性，对今后的实际测量提出了建议。