本体参数及间隙结构对EGLA放电电压影响的研究

Study on the Influence of SVU Parameter and Gap Structure on Discharge Voltage of EGLA

为了保证外串空气间隙线路避雷器(EGLA)性能更好地满足线路绝缘配合要求,掌握间隙的放电电压参数是重中之重,研究间隙放电电压与各影响因素的关系就成为了一个关键的课题。在间隙未放电时间隙与本体的电压分配主要受电容影响,因此EGLA的放电电压与本体电容及间隙电容有着密切的关系。使用ANSYS仿真计算了35kV、110kVEGLA试品不同本体参数、不同间隙结构的电容量和电压分配,并实验研究了相应配置下EGLA的工频和冲击放电电压,对比仿真计算与实验结果,获得了EGLA的放电电压主要受本体参数及间隙等值电容影响,本体参数中等值电容影响更大的结论。

In order to make the performance of externally gapped line arrester meet the requirements of national standards, the discharge voltage of its gap becomes the most important parameter. Therefore, the study on the relation between discharge voltage of the gap and other influential factors is considered as a critical project. Generally, it is recognized that the distribution of voltage between SVU and gap follows the pattern of serial capacitance distribution of vohage. As a result, there is a close relevance between discharge voltage of the gap and capacitance of SVU and the gap. In this study, capacitances of gaps in different structures are calculated with ANSYS software; discharge experiments under power frequency as well as impulse vohage are conducted on EGLA under different configurations; results of calculation and experiments are compared; preliminary conclusions are deducted. It is showed that by their capacitance, SVU parameters and gap structures affect the discharge voltage of EGLA, and the influence of SVU is larger.