针对沿面模型在振荡雷电冲击电压下进行局部放电特性研究.首先搭建了振荡冲击电压发生器,产生符合IEC 60060-3:2006的振荡型雷电冲击电压;然后基于特高频法和脉冲电流法,建立了冲击电压下局部放电测量系统;构建了SF6沿面模型,对负极性振荡雷电冲击电压下的局部放电进行测量,分析放电幅值、放电次数和放电相位随外施电压的变化规律.结果表明:与脉冲电流法相比,特高频法测量局部放电的灵敏度更高;局部放电发生在外施电压波峰或波谷来临前的上升沿和下降沿;放电幅值和次数随外施电压升高而线性增大,第一上升沿激发的放电幅值最大、放电次数最多;随着外施电压的升高,放电相位分布呈现明显的"左移".
This paper is aiming at studying the surface discharge characteristics of surface defect under oscillating lightning impulse voltage. Firstly, an oscillating impulse voltage generator was established, which can generate the oscillating lightning impulse voltage met the requirements of standard IEC 60060-3:2006. Secondly, a partial discharge detecting system under impulse voltage was established based on UHF method and pulse current method. Finally, a SF6 surface defect model was built to measure the partial discharge under negative oscillating impulse voltage. The variation of disharge amplitude, disharge times, and disharge phase with the applied voltage was analyzed. The results show that the detection sensitivity of UHF method is higher than that of pulse current method. The PD occurs in the rising and falling edges prior to the wave crest and trough. The discharge amplitude and discharge times increase linearly with the increase of applied voltage, and the PD motivated by the first rising edge has the largest discharge amplitudes and the most discharge times. With the increase of applied voltage, the discharge phase distribution shows an obvious"left shift".
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