直流电压下油纸绝缘结构气隙模型的局部放电特性  

Characteristic of Partial Discharge in Air Gap Model of Oil-Paper Insulation Under DC Voltage

作　　者：孙振权[1] 赵学风[1] 李继胜[1] 顾朝敏[1] 李彦明[1] 

机构地区：[1]西安交通大学电气工程学院,西安710049

出　　处：《电工技术学报》2010年第9期20-27,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(50977075)

摘　　要：在油纸类绝缘的高压电力设备中,绝缘介质中的气隙是产生局部放电的主要来源。一般来讲,气隙主要有油纸固体绝缘纸板中因制造工艺等产生的气隙,另外还有绝缘油液体中的气泡产生的气隙。为了研究直流电压下油纸类绝缘介质的局部放电特征,在实验室内构建了油纸绝缘结构中绝缘纸板气隙模型和油中气泡气隙模型,施加直流电压,分别采用罗氏线圈与采样电阻来测量局部放电信号。利用Origin数值分析软件对局部放电脉冲进行频谱特性分析及滤波处理等。研究结果给出了绝缘纸板气隙和油中气泡气隙模型在直流电压作用下局部放电的波形特征,为研究油纸绝缘类设备(如直流输电系统中的换流变压器)在直流电压下的局部放电的检测与识别奠定基础。The air gap of the insulation system is the main source caused partial discharge （PD） in high voltage power equipment made of oil-paper insulation material. In general,there are two kinds of air gaps,which come out from solid insulation-paper board because of manufacture process and liquid insulation-bubbles in oil. To investigate the characteristic of PD in oil-paper insulation under direct current （DC） voltage,this paper presents the air gap model of paper board and bubbles model in oil with oil-paper insulation system respectively. The partial discharges of these models are measured by Rogowski coil and sampling resistor under direct current voltage in the laboratory. The partial discharge pulses are analyzed and processed by Origin software such as frequency spectrum and filtering. The characteristic of PD pulses of the air gap in oil-paper under DC voltage are described in the end. These results lay the foundation for the PD measurement and recognition in oil-paper insulation system （such as converter transformer） under DC voltage.

关 键 词：直流电压下局部放电 绝缘纸板气隙模型 油中气泡气隙模型 频谱 

分 类 号：TM835.4[电气工程—高电压与绝缘技术]