为了研究开关柜金属悬浮局部放电的特点，制作了金属悬浮缺陷模型，将模型放置在实体开关柜内，对开关柜施加高电压，采用脉冲电流法、特高频法、暂态对地电压法、超声波法对模型的放电进行了测量，分析放电的图谱特征及放电特性。结果表明：随着放电严重程度的增加，脉冲电流法的幅值-相位图谱上放电相位变宽；特高频检波图谱上放电频次变得密集；超声波幅值以及地电波的脉冲数目增长趋势较明显。放电起始电压随着间隙距离的增加而增大，当外施电压为6 kV，只有间隙距离L≤3.5 mm时间隙才会产生局部放电。
In order to study the characteristics of metal suspension discharge in switchgear, we made a metal suspension defect model in switchgear. The switchgear was applied high voltage, and the discharge of the defect model was measured by pulse current method, ultra-high frequency (UHF) method, transient earth voltage (TEV) method, and ultrasonic method respectively, then the discharge spectra and characteristics were analyzed. The results indicate that with the increase of discharge degree, the discharge phase becomes wider on the amplitude-phase spectrum of pulse current method; the discharge frequency becomes denser on the ultra-high frequency detection spectrum; the amplitude of the ultrasonic wave and the pulse number of TEV increase obviously. The discharge inception voltage increases with the increase of gap distance. Under 6 kV applied voltage condition, the gap would produce partial discharge when the gap distance is less than 3.5 mm.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%