针板缺陷下局部放电的严重程度分析

高压开关柜在输配电系统的开关控制中起着至关重要的作用,通过状态监测识别其缺陷严重程度具有重要的工程意义。根据开关柜的常见放电情形,设计了模拟尖刺放电的针板缺陷模型,通过逐步升压法研究了局部放电图谱随缺陷严重程度的变化规律,并通过简化模型定量分析了局部放电发展过程中的电荷运动和电场分布规律。结果表明,该模型可有效刻画缺陷严重程度演变的本质,并提供了一种基于局部放电图谱的判别依据。研究成果可应用于实际工程中。

Analysis of Partial Discharge Development Level under Needle-plate Defect

The HV switchgear is widely applied and plays a critical role in on-off control of entire power transmission and distribution system, which leads to important engineering significance of partial discharge (PD) level recognition through condition monitoring. To simulate the harsh discharge, the needle-plate discharge defect model was designed according to the most common PD conditions in switchgear. The variation of phased resolved partial discharge (PRPD) spectra with respective to different levels of PD were measured through gradually voltage-rising method, and a simplified model was established to quantitatively analyze the developing process of space charge movement and electric field distribution during PD. The results show that this model clearly revealed the underlying reasons for the PD level-dependent PRPD spectrum. Based on this analysis, a criterion of PRPD for PD level was proposed. The results can be applied to practical engineering.