Research on DC Bias Test of Power Transformer

With the operation of HVDC transmission line in power system, in single pole ground operation, DC converter station in the vicinity of the AC transformer by DC current invasion, resulting in vibration and noise increase and loss increase and overheating problems and affect the transformer safe operation. The test method of DC bias of transformer without load and with some simulation load was introduced. The characteristics under loss, noise and vibration of transformer are analyzed. The suggestions of ability of withstand DC bias in power grid system are presented.