采用脉冲序列分析（PSA）谱图表征电缆附件处缺陷的局部放电特性，设计了3种典型缺陷，搭建了基于脉冲电流法的电缆附件局部放电检测平台。通过阶升电压和长时间耐压试验，对比了XLPE电缆附件缺陷局部放电的PSA谱图和PRPD谱图。结果表明：PSA谱图可作为传统PRPD谱图的补充，对局部放电的脉冲序列特性进行描述；PSA谱图在区分电缆附件缺陷类型上具有较好的区别度，同时对预警电缆附件击穿具有重要的参考价值；落点概率可作为一种表征PSA谱图特性的特征量应用于局部放电检测中。
The partial discharge characteristics of defects in cable accessory were characterized by PSA. Three kinds of typical defects were designed in cable accessory, and a partial discharge detection plat-form based on pulse current method was built. The cable accessory was carried out step-up voltage exper-iment and long-time withstand voltage experiment, and the PSA pattern and PRPD pattern of defects in XLPE cable accessory were compared. The results show that the PSA pattern can describe the pulse sequence characteristics of partial discharge as a supplement of traditional PRPD pattern. It can distin-guish the defect types of cable accessory better and has important reference value for early warning breakdown of cable accessories. The probability density can be used as a characteristic parameter of PSA pattern in partial discharge detection.
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