发电机出口电压互感器绝缘缺陷检测方法

发布时间：2018-05-17 01:03

本文选题：发电机出口电压互感器 + 绝缘缺陷　；参考：《电网技术》2016年12期

【摘要】：发电机出口电压互感器PT是发电机监控的重要设备,其绝缘缺陷的检测与发电机的安全可靠运行密切相关。提出一种检测发电机出口电压互感器PT绝缘缺陷的新方法。该方法以降幅雷电冲击试验电压为激励,以PT可测端的等效高频电压和电流为信号源,以不同幅值的两组雷电冲击试验对应电压、电流的广义相关系数为判据,根据判别函数的数值大小,实现发电机出口PT绝缘缺陷的检测和故障诊断。对判据函数值的大小进行比较,以此分析得出发电机出口电压互感器绝缘的状况。作为判别理论依据的判别函数f(u,i,t)实际上是一种非线性映射,通过判别函数f(u,i,t)数值的大小检测被试品是否存在缺陷,而不是通过某一在强噪声背景下的微小特征量进行诊断,因而具有较强的抗干扰能力和可靠性。
[Abstract]:PT for generator outlet voltage transformer is an important equipment for generator monitoring. The detection of insulation defect is closely related to the safe and reliable operation of generator. A new method for detecting PT insulation defect of generator outlet voltage transformer is presented. In this method, the reduced lightning impulse test voltage is used as the excitation, the equivalent high frequency voltage and current at the measuring end of PT are used as the signal source, and two groups of lightning impulse tests with different amplitudes corresponding to the voltage and the generalized correlation coefficient of the current are taken as the criterion. According to the value of discriminant function, the detection and fault diagnosis of PT insulation defect at generator outlet are realized. The insulation of generator outlet voltage transformer is obtained by comparing the value of criterion function. The discriminant function based on the discriminant theory is actually a kind of nonlinear mapping. By the size of the value of the discriminant function fu / u / t), the size of the value of the discriminant function can be used to detect whether the sample is defective or not, but not to be diagnosed by a small characteristic quantity in the strong noise background. Therefore, it has strong anti-interference ability and reliability.
【作者单位】：华北电力科学研究院有限责任公司;华北电力大学电气与电子工程学院;
【分类号】：TM451;TM855

【相似文献】