冲击电压下GIS典型绝缘缺陷局部放电光-电信号特性研究  

Study on characteristics of local discharge photoelectric signal of typical insulation defects in GIS under impulse voltage

作　　者：顾朝敏 庞先海 董驰 李天辉 路士杰 李燎 韩旭涛 GU Chaomin;PANG Xianhai;DONG Chi;LI Tianhui;LU Shijie;LI Liao;HAN Xutao(State Grid Hebei Electric Power Research Institute,Shijiazhuang 050021,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]国网河北省电力有限公司电力科学研究院,河北石家庄050021 [2]西安交通大学电气工程学院,陕西西安710049

出　　处：《电工电能新技术》2024年第6期70-78,共9页Advanced Technology of Electrical Engineering and Energy

基　　金：国网河北省电力有限公司科技项目(kj2022-063)。

摘　　要：气体绝缘组合电器(GIS)是电力系统中重要的变电设备,发生故障时会为国民经济带来严重的损失。GIS设备在运行过程中既会受到运行电压的作用,还会受到暂态冲击电压的影响。大幅值的暂态冲击会激发工频运行电压下潜伏的微小缺陷产生局部放电,关注冲击电压下的局部放电信号能够有效提升设备内部微小缺陷检出的灵敏度。针对于此,本文将绝缘缺陷设置在实体GIS上,基于光电一体化融合传感器,利用特高频法和光测法对振荡型冲击电压下的局部放电进行了测量和分析。振荡型冲击下实体GIS中的三种典型缺陷局部放电检测结果表明:尖刺缺陷下放电主要出现在外施电压的峰值附近,但当电压较高时,由于空间电荷形成的反向电场的影响,引发波谷放电。悬浮缺陷下放电会发生在更多的放电周期,主要发生在外施电压的上升沿和下降沿,其中一些放电幅值较大,特高频法和荧光光纤法可以同时检测到放电脉冲。沿面缺陷下的放电脉冲依次发生在外施电压的上升沿和下降沿,荧光光纤法只能检测到极个别的放电脉冲。Gas Insulated Switchgear(GIS)is an important substation equipment in the power system.If it fails,it will bring serious losses to the national economy.GIS equipment is subjected to not only power frequency operating voltage during operation,but also to transient impulse voltage.Large transient surges can trigger small defects hid⁃den under power frequency operating voltage to generate partial discharge.Focusing on the partial discharge signal under the surge voltage can effectively improve the sensitivity of detecting small defects inside the equipment.In re⁃sponse to this,this article sets up typical insulation defects on physical GIS,and based on optoelectronic integrated fusion sensors,uses ultra⁃high frequency method and optical measurement method to measure and analyze partial discharge under oscillating impulse voltage.The partial discharge detection results of three typical defects in physi⁃cal GIS under oscillatory impact indicate that the discharge under sharp defects mainly occurs near the peak of ap⁃plied voltage.But when the voltage is high,due to the influence of the reverse electric field formed by the space charge,the valley discharge is triggered.The discharge under suspended defects will occur in more discharge cy⁃cles,mainly at the rising and falling edges of the applied voltage.Some of the discharge amplitudes are larger,and the ultra⁃high frequency method and fluorescent fiber method can simultaneously detect the discharge pulse.The discharge pulses under surface defects occur sequentially at the rising and falling edges of the applied voltage,and the fluorescence fiber method can only detect very few discharge pulses.

关 键 词：GIS 局部放电 特高频法 荧光光纤法 

分 类 号：TM595[电气工程—电器]