摘要
特高压GIL设备是特高压输电工程的重要组成单元,故障精确定位是缩短GIL设备绝缘击穿故障抢修时间,提高特高压输电可靠性的关键。为满足特高压GIL故障精确定位需求,研究特高压GIL设备内部绝缘击穿时所产生暂态电压的波形时频特征是基础。文中利用真型1100 kV GIL设备构建试验平台,通过模拟盆式绝缘子表面缺陷诱发GIL设备内部绝缘闪络。采用超宽频带的电压测量系统准确测量盆式绝缘子闪络过程中电压突变,通过分析击穿过程暂态电压波形的时域和频域特征,揭示特高压GIL设备盆式绝缘子闪络的电磁波激发机理。同时还对比分析了不同极性电压下,闪络诱发暂态电压波形时频特征的变化规律。通过试验分析发现,特高压GIL设备盆式绝缘子击穿时暂态电压的上升沿低于110 ns,陡度大于5 kV/ns,激发电磁波的高频分量可达4 MHz。因此通过准确测量击穿电压,可大幅提升电压行波定位的精度,为实现特高压GIL设备10 m级故障精确定位奠定坚实基础。
The ultra-high voltage(UHV)GIL equipment is an important component of the UHV transmission system,and accurate fault location is the key to shorten the repair time of the insulation breakdown fault of GIL equipment and improve the reliability of UHV transmission.In order to meet the requirements of accurate fault location,it is essential to research the time-frequency characteristics of the transient voltage waveform generated during the insulation breakdown of the UHV GIL.In this paper,an experimental platform is arranged based on the true the actual1100 kV gas insulated line(GIL),and the surface defect is simulated to induce the flashover along the basin-type Insulator inside the GIL.The ultra-wide band(UWB)voltage measurement system is used to accurately measure the abrupt voltage change during the flashover process of the basin-type insulator.Through analyzing the time domain and frequency domain characteristics of the voltage waveform during the breakdown process,the excitation mechanism of the electromagnetic wave is revealed.Meanwhile,the time-frequency characteristics of voltage waveform in flashover process are compared and analyzed under the different polarity voltages.The experimental analysis shows that the rising edge of the breakdown waveform along the basin-type insulator in the UHV GIL is almost lower than110 ns,the steepness is greater than 5.6 kV/ns,and the high-frequency component of the excited electromagnetic wave can reach up to 4 MHz.Therefore,by accurately measuring of the breakdown voltage waveform,the accuracy of voltage traveling wave positioning can be greatly improved,laying firm foundation for the accurate 10-meter fault location in the UHV GIL.
作者
丁登伟
刘卫东
张紫薇
何良
袁明虎
张晨
DING Dengwei;LIU Weidong;ZHANG Ziwei;HE Liang;YUAN Minghu;ZHANG Chen(Sichuan Energy Internet Research Institute,Tsinghua University,Chengdu 610213,China;State Key Lab of Control and Simulation of Power System and Generation Equipments,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)
出处
《高压电器》
CAS
CSCD
北大核心
2020年第2期1-6,共6页
High Voltage Apparatus
基金
国家自然科学基金(51977120)
四川省重大科技专项(2018GZDZX0043).
