电力机车高压电压互感器谐波传递特性试验研究

Experimental Study on Harmonic Transmission Characteristics of Voltage Transformers for Electric Locomotives

我国电气化铁路大量采用交流传统电力机车后频繁出现车网电气高频谐波谐振问题,认识并解决该问题先要做的是准确测量宽频范围内的电压。因此,电力机车高压电压互感器的谐波传递特性越来越受到重视。文章采用谐波注入的方法,通过试验获得电压互感器一二次电压信号,以离线计算的方式获得电压互感器在不同谐波频率段的电压变比、电压相位偏移等关键数据。此外,通过对比不同型号的电压互感器试验数据,分析不同电压互感器谐波传递特性的异同。研究结果可用于对电力机车测得的牵引网电压的矫正,有助于提高测量信号的准确度。

High-frequency harmonic resonance problems between trains and the contact network occur frequently when ACdriven trains are widely used.Accurate measurement of voltage over a wide frequency range is most needed to recognize and solve the problem,and harmonic transmission characteristics of high-voltage voltage transformers for electric locomotives are receiving increasing attention.In this paper,the harmonic injection method is proposed for voltage transformers to experimentally obtain test data,and offline calculations to obtain key data such as harmonic voltage ratios,harmonic voltage phase shifts in different harmonic frequency bands.In addition,the similarities and differences of harmonic transmission characteristics of different voltage transformers are analyzed by comparing the test data of different voltage transformers.The results of the study can be used to correct the voltage measured by electric locomotives,which helps to improve the accuracy of the measured voltage signal.