改进的变压器绕组变形带电检测方法

Improved Charged Detection Method of Transformer Winding Deformation

变压器绕组变形带电检测技术的应用有利于提高变压器运行的安全可靠性,降低停电检修带来的经济损失。文中指出了目前绕组带电检测研究的不足之处并做出了改进,提出了一种基于耦合电容器注入信号的变压器绕组变形带电检测方法。利用耦合电容器将泰克大功率信号发生器输出的扫频信号通过中性点套管注入变压器中,并测量改造后的高压套管末屏接地电流作为响应信号,最后将输入信号及响应信号输入工控机中进行数据处理,得到被测绕组的频率响应曲线。文中先是搭建了变压器绕组的电路仿真模型,通过理论说明所提出方法的可行性。最后,对一台110 k V真实变压器进行了测试,试验结果表明,该方法具备实际在线应用的潜力。

The application of charged detection technology of transformer winding deformation is beneficial to improve the safety and reliability of transformer operation, and reduce the economic loss caused by outage maintenance. This paper points out the deficiency of the current research on the charged detection of the winding and makes an improvement, and puts forward a new method for the detection of the transformer winding deformation based on the signal injection using coupling capacitor. In this paper, sweep signal of Tektronix high power signal generator is injected into transformer through the neutral bushing by using the coupling capacitor, and the ground current of the high voltage bushing tap is measured as a response signal. Then, the input signal and response signal are input to the industrial computer for data processing, and the frequency response curve of the measured winding is obtained. In this paper, the circuit simulation model of transformer winding is built, and the feasibility of the proposed method is illustrated by the theory. Finally, a 110 kV real transformer is tested. The test results show that the method has the potential for practical application.