Broadband Impedance Spectrum-based Method of Locating Electrical Tree Degradation in XLPE Cable Insulation
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.
万方数据
维普
