A Method of Calculating the Characteristic ...

In order to protect the equipments and make rules for lightning protections, it’s essential to record accurate lightning overvoltage waves. The use of serial reactors which are intended to limit large current brings new problems for measuring the lightning overvoltage. This paper analyzes the change of the lightning overvoltage through the serial reactor and the bus, and concludes that the overvoltage at the entrance of the transformer can’t reflect the invasion voltage of the substation well. In review of the position of the arrester in the substation, a method for calculating the lightning overvoltage is presented by using the leakage current of the arrester, and reverse iterative method is put forward in the calculation of the PINCETI model. The leakage current of 110kV arrester is simulated with ATP-EMTP and the amplitude and steepness of the lightning overvoltage are calculated, which verified the effectiveness of the proposed method.