0.1 Hz超低频与振荡波电压下热缩和冷缩电缆附件典型缺陷局部放电对比研究

Comparative Study on Partial Discharge of Typical Defects of Heat-shrinkable and Cold-shrinkable Cable Accessories Under 0.1 Hz Ultra-low Frequency Voltage and OscillatoryWave Voltage

通过建立热缩和冷缩电缆附件典型缺陷模型,在0.1 Hz超低频和振荡波电压下进行局部放电试验,测量并对比两种电压下电缆典型缺陷的局部放电起始电压(PDIV)、局部放电量以及局部放电次数等参量的差异,并对这些差异的形成机制进行分析。结果表明:对于所测量的大多数缺陷,振荡波电压下的PDIV更小,局部放电量更大,局部放电脉冲数更多。缺陷位置电压分布机制和电压恢复速率的不同是导致上述差异的主要原因。

The typical defects model of heat-shrinkable and cold-shrinkable cable accessories were established,and partial discharge tests were carried out at 0.1 Hz ultra-low frequency and oscillatory wave voltage.The differences in the partial discharge inception voltage(PDIV),the PD quantity,the number of PD and other parameters of the typical defects under the two voltages were measured and compared,and the formation mechanism of these differences was analyzed.The results show that for most of the measured defects,compared with under 0.1 Hz ultra-low frequency voltage,the PDIV under the oscillating wave voltage is lower,the PD quantity is larger,and the number of partial discharge pulses is more.The difference in the voltage distribution mechanism and the voltage recovery rate at the defect location is the main reason for the above-mentioned difference.