【摘要】 利用雷电波侵入XLPE电缆绕组的外端口特性得出其暂态等值电路,并进行分析求解。发现避雷器的放电电压和残压越高,电缆绕组上的电压越高;但是侵入波越陡、入口电容越大,反而可能使得电缆绕组上不会出现高于避雷器残压的过电压,有利于电缆绕组的保护。这与传统变压器绕组出现具有余弦振荡性质的过电压有很大不同。对绕组输入模拟雷电波进行实验并使用EMTDC仿真,对比表明电缆绕组在雷电冲击电压作用时外端口特性可用R、C串联支路来近似等效。为这种新型变压器的设计、保护技术提供了参考依据。更多还原

【Abstract】 The transient circuit of import characteristic of XLPE cable winding is solved.The higher discharge-voltage and residual voltage of arrester is the higher voltage of cable winding.The steeper thunder surge and the larger entrance capacity makes the voltage of cable winding lower than the residual voltage of arrester,and it is advantageous to the protection of cable winding.This phenomenon is different from that of the traditional winding.It provides a theoretical basis for the design,protection and testing of this new type of power transformer.更多还原