基于脉冲电流法判断输电线电晕放电研究

对输电线电晕放电的起晕电压、电晕脉冲电流、起晕场强进行了研究。采用基于脉冲电流法判断电晕笼内单根输电线起晕电压。通过局部放电检测回路中的检测阻抗,获取电晕脉冲电流波形。当脉冲电流持续出现时,此时导线所加电压,即为电晕起始电压。根据实验得到的起始电晕电压,借助有限元法计算笼内导线表面及其附近场强,结果与通过皮克经验公式得到的较为接近,验证了脉冲电流法判断输电线路起晕电压的合理性。

Judging Corona Discharge of the Transmission Line Based on Pulse Current Method

This paper studies corona onset voltage,corona pulse current and corona onset electric field intensity of transmission line corona discharge.Pulse current method is used to judge corona onset voltage of transmission lines in corona cage.Corona pulse current is gained by detection impedance of partial discharge detection circuit.When pulse current is sustained in existence,voltage loading on conductors is called corona onset voltage.According to onset corona voltage on trial,the calculation of surface electric field on conductor by Finite Element Method,the result is really close to Peek’s empirical formula’s numerical value.It is verified that the pulse current method is reasonable to judging onset corona voltage on transmission lines.