高电压技术2013，Vol.39Issue(6)：1419-1425,7.DOI:10.3969/j.issn.1003-6520.2013.06.019
直流电压下油、纸绝缘结构不连续界面空间电荷积聚特性
Accumulation Characteristics of Interface Charge in the Oil-paper Insulation Under DC Voltage
摘要
Abstract
Under DC voltage,the distribution of electric field is distorted greatly due to accumulated space charges in oil-paper interface,which is of importance to insulation design and operation of DC transmission equipment.Thus,we studied the accumulation progress of space charge in oil-paper interface using a pressboard covering upper/lower electrode model.An electric field on-line measurement platform based on the Kerr electro-optic effect was established to realize measurement of electric field intensity in oil in real time without any contact.The experimental results reveal that,1)a significant difference exists between the damped transients of electric field in the oil under DC voltages of two opposite polarities,indicating obvious polarity effects; 2)the polarity of the interface charge accumulated in the oil-paper interface is directly related to the polarity of the applied voltage and the spatial location of the oil and pressboard.With the pressboard covering the upper electrode,the polarity of the space charge is opposite to that of the DC voltage.However,the polarity of space charge is the same as that of the applied DC voltage for the model with pressboard covering the lower electrode; 3)the damped transient of the electric field in the oil depends on the charge accumulation process,and negative charge in the oil-paper interface accumulates much faster than positive charge.关键词
油纸绝缘/Kerr效应/空间电荷/电荷积聚/极性效应/直流Key words
oil-paper insulation/ Kerr-effect/ interface charge/ charge accumulation/ polarity effect / DC引用本文复制引用
吴昊,李成榕,齐波,赵林杰,吕金壮,孙夏青..直流电压下油、纸绝缘结构不连续界面空间电荷积聚特性[J].高电压技术,2013,39(6):1419-1425,7.基金项目
国家重点基础研究发展计划(973计划)(2011CB209404) （973计划）
南方电网重点科技项目(SEPRI-ZL-K201015) （SEPRI-ZL-K201015）
中央高校基本科研业务费专项(12ZP06) （12ZP06）
Project supported by National Basic Research Program of China(973 Program) (2011CB209404),Key Science and Technology Research Program of China Southern Power Grid(SEPRI-ZL-K201015),Fundamental Research Fund for the Central Universities(12ZP06). （973 Program）
