Converter Transformer Closing Overvoltage Level And Restrictions In ±800kV Pu' er Station Isolated Island

As a extra high voltage engineering, the Converter transformer is the key part of the Pu'er converter station, which is used for voltage transform and differential angle in the process of DC operation. When Pu'er converter station is operating as isolated islanded, It is very important whether the converter transformer can run normally. If the device is operating during over voltage, and it cause the equipment breakdown, even it caused the loss of equipment. In the case of isolated islanding model, the paper will calculate the voltage with DC bipolar block by the engineering test data and specification in the Pu'er converter station, and it find the over-voltage level whether meet the requirements of the project's converter transformer. Through the calculation of the phase selection device under different parameter at the same time, it calculates the key parameters of converter transformer equipment, and it gives a reasonable measure for limit converter transformer overvoltage in the Pu'er converterstation.