空气绝缘输电线路中不同气压对UHF信号与放电量之间关系的影响  

Relationship Between UHF Signals and Discharge Quantity Under Various Pressures in Air Insulated Transmission Line

作　　者：卓然[1] 唐炬[1] 张晓星[1] 熊浩[2] 蒋浩[2] 唐俊忠[3] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030 [2]国网重庆市电力公司检修分公司,重庆400039 [3]四川电力设计咨询有限责任公司,成都610016

出　　处：《高电压技术》2014年第5期1475-1480,共6页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724506);教育部"新世纪优秀人才支持计划"(NCET-12-0590)~~

摘　　要：气体绝缘输电线路（GIL）已成为替代架空输电线路与高压电缆的首选方案,为研究气体绝缘开关设备（GIS）中UHF信号与气压之间的关系,针对0.1～0.4 MPa不同气压下金属突出物缺陷模型的局部放电情况,提取了UHF信号的信号能量与重积分等典型特征量,与脉冲电流法信号进行了相关性分析。研究表明：各个气压下的UHF信号能量及其重积分与放电量平方的线性关系具有较高的相关系数;UHF信号能量的线性斜率与气体压力相对应;放电量的分布区域在高气压下狭小,但与低气压时相比,UHF信号的能量随之变化的灵敏度较高。研究结果丰富了气压变化条件下的UHF检测数据库,为标定空气型GIL UHF信号放电量的研究奠定了基础。Gas-insulated transmission line（GIL） has become a preferred alternative to replace the overhead transmission, in order to study the relationship between quantity of UHF signal and gas pressure in gas insulated switchgears（GISs）, taking partial discharges on metal protrusions under pressures from 0.1 to 0.4 MPa as an example, we extracted the energy and multiple integral of PD signals to conduct a correlation analysis with the signals collected using pulse current method. It is concluded that both the signal energy and its double integral have a linear relationship with the square of signal discharge, and this relationship has a large correlation coefficient. Moreover, the linear slope of UHF signal energy has a strict relation with pressure. It is also found that the distributing area of discharge quantity is relatively narrower at high pressures, and the sensitivity of UHF signal energy is higher than that at low pressure. The results enrich the database of UHF detection under various gas pressures and lay a foundation for calibrating UHF signal＇s discharge quantity in air-GIL.

关 键 词：超高频法 脉冲电流法 空气绝缘输电线路 气体压力 局部放电 可决系数 局部放电量 

分 类 号：TM863[电气工程—高电压与绝缘技术]