基于宽频阻抗谱BIS的XLPE电缆绝缘电树枝缺陷定位方法

Broadband Impedance Spectrum-based Method of Locating Electrical Tree Degradation in XLPE Cable Insulation

提出了一种改进的宽频阻抗谱BIS方法来定位XLPE电缆中的电树枝缺陷。进行了不同温度下的电树枝实验,以启动不同类型的电树枝。利用矢量网络分析仪测试了电树枝生长过程中的高频电容特性。采用改进的定位算法计算了含有不同类型电树枝缺陷的20m长电缆的定位谱,结果表明切片样品的电容随着电树枝的生长而减小。丛林状电树对电容参数的影响大于松枝状电树枝。在丛林状电树枝的定位谱中发现了一个典型的双峰,在松枝状电树枝的光谱中发现了单个峰。

This work proposes a modified broadband impedance spectrum(BIS)method to locate electrical trees in XLPE cable.Electrical tree experiments at different temperatures were carried out to initiate different types of electrical trees.A vector network analyzer(VNA)is used to test the high frequency capacitance characteristics in the treeing process.The location spectra of the 20 m long cable containing different types of electrical trees are calculated by the modified location algorithm.The results show that the capacitance of the sliced sample decreases with treeing time.The effect of the bush-pine tree on capacitance parameters is greater than that of the branch-pine tree.A typical double-peak is found in the bush-pine tree location spectrum and a single-peak is found in the branch-pine tree spectrum.