电力变压器直流偏磁治理及测试分析

DC Magnetic Bias Control and Test Analysis of Power Transformer

直流输电单极大地运行、地铁运行产生的入地电流会对附近的接地变压器产生影响,入地电流引起的直流偏磁给变压器运行带来安全隐患,本文分析了直流偏磁电流产生的原因,对接地变压器中性点加装电容隔直装置,监测改造前后的变压器的中性点直流电流、噪声及振动等技术指标,治理效果明显,给地铁附近接地变压器运行提供了技术支持。

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.