基于材料和电场分布的不同电缆缺陷的震荡波表征效果研究
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中国南方电网有限责任公司科技项目(000301SY00022)


Detective effect of oscillation on different defects of cable from the perspective of materials and electric field
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    摘要:

    为理解振荡波电压法对电缆不同缺陷的测试结果,该文从电场角度分析振荡波对电缆界面和内部缺陷的表征效果。首先,在实验室搭建振荡波试验平台对人工制作的刀痕、外半导搭接不良2种缺陷进行局部放电测试;然后,通过起始放电电压(PDIV)与局部放电相位谱图(PRPD)初步分析振荡波对2种缺陷的激发特征;进而利用有限元仿真软件对2种缺陷进行三维电场仿真,以缺陷的不同尺寸表示现场缺陷的多样性,并从缺陷处的电场畸变情况解释2种缺陷的放电特征。试验和仿真结果表明:内部缺陷类的刀痕缺陷由于硅脂填充的影响难以被振荡波电压法检测出来,而界面缺陷类的外半导搭接不良缺陷具有较好的表征效果。

    Abstract:

    The effect of the oscillating wave on the interfacial and internal defects of cable from the perspective of the electric field is studied in order to understand the test results of the oscillating wave voltage method for different defects in cables. Firstly, an oscillating wave test platform is set up to partial discharge tests the artificial defective models including longitudinal knife defects and external semiconductor lap defects. Then, the excitation characteristics of oscillation wave are analyzed primarily by PDIV and PRPD. Furthermore, the electric field distribution of cables with defects are simulated by utilizing a finite element simulation software in threedimension. Artificial defects with different sizes are fabricated to represent the diversity of the defect site and the characteristics of defective discharges are explained by the electric field distortion at the defects. Experimental and simulation results show that: it is hard to detect the internal defects due to the filling of hard grease by using the oscillation wave voltage method, whereas interfacial defects of poor connection of outer semiconductor has better characterization results.

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苑吉河,杨 阳,张 曦,黄华勇,汪先进,周 凯.基于材料和电场分布的不同电缆缺陷的震荡波表征效果研究[J].电力科学与技术学报,2020,35(4):42-48. YUAN Jihe, YANG Yang, ZHANG Xi, HUANG Huayong, WANG Xianjin, ZHOU Kai. Detective effect of oscillation on different defects of cable from the perspective of materials and electric field[J]. JOURNAL OF EIECTRIC POWER SCIENCE AND TECHNOLOGY,2020,35(4):42-48.

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  • 在线发布日期: 2020-09-04