振荡型雷电冲击电压下变压器绕组电压分布特性

Voltage Distribution Characteristics of Transformer Winding Under Oscillating Impulse Voltage Waveform

利用振荡型冲击电压进行变压器冲击耐压试验具有波形易于调节、产生效率高的优点,为了研究振荡型类雷电冲击电压和标准雷电冲击电压波形在变压器绕组中分布特性的差异,利用能够产生不同类型冲击电压的发生装置,实际测量了变压器绕组各出线端的电压波形,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,振荡型雷电冲击电压波形畸变更为明显,其对变压器绕组首端位置主绝缘和纵绝缘的考核严酷程度更高。

The transformer impulse withstand voltage test using the oscillating impulse voltage has the advantages of easy waveform adjustment and high efficiency.In order to study the difference of voltage distribution characteristics of transformer winding under oscillating and standard impulse voltage waveform,the voltage waveforms of winding in transformer are measured using the voltage generator which can generate different lightning impulse voltage waveforms.The voltage distribution characteristics and influence law are studied and analyzed.The study results shown that the oscillating lightning impulse voltage waveform distortion obviously than the standard lightning impulse voltage waveform,and it is more stringent assessment to the main insulation and longitudinal insulation of the transformer winding terminal position.