不同类型雷电冲击电压下变压器绕组电压分布特性研究

Voltage Distribution Characteristics of Transformer Winding under Different Type Impulse Voltage Waveform

研究表明,变压器在运行过程中所承受的雷电冲击电压在到达线端时均呈现振荡形式。为了研究不同类型雷电冲击电压在变压器绕组中分布特性的差异,本文笔者通过仿真建立变压器绕组模型,得到了不同冲击电压下绕组内部的响应。同时利用绕组分布电压测量平台,研究和分析了其分布特性及影响规律。结果表明,相比标准雷电冲击电压波形,振荡型雷电冲击对绕组端部绝缘的考核更加严格,但其对于绕组主绝缘的考核相对宽松。

Research has shown that the lightning impulse voltage suffered by the transformer during operation all presents an oscillating type. In order to study the differences in the distribution characteristics of different types of lightning impulse voltages in the transformer windings, this paper establishes a transformer winding model through simulation, and obtains the internal responses of the windings under different impulse voltages. At the same time, using the winding distributed voltage measurement platform, the distribution characteristics are analyzed. The results show that, compared with the standard lightning impulse, the oscillating lightning impulse has more stringent assessments on the insulation of the winding ends, but it has relatively loose assessments on the main insulation of the windings.