Experimental Study on Harmonic Transmission Characteristics of Voltage Transformers for Electric Locomotives
High-frequency harmonic resonance problems between trains and the contact network occur frequently when AC-driven 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.
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