The grounding current generated by unipolar operation of DC transmission and subway operation can have an impact on nearby grounding transformers,causing DC bias and posing safety hazards to transformer operation.The article explains the cause of DC bias current.A capacitive straightening device is installed at the neutral point of the earthed transformer to monitor the DC current,noise,and vibration of the modified transformer.The governance effect is obvious,providing technical support for the operation of grounding transformers near the subway.
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