特高压输电线路宽频带电晕损失测量系统

Wide Frequency Band Corona Loss Measurement System for UHV Transmission Lines

为研究特高压(UHV)分裂导线宽频带的电晕电流特性,进而计算导线的电晕损失,设计研制了1套基于全球定位系统(GPS)同步时钟的宽频带电晕损失测量系统。该系统通过全球定位系统(GPS)同步授时实现电压和电流信号的同步采集。通过无线网络传输模块,将上位机采集到的电流信号传输到下位机,这种方式可以实现电晕电流的安全可靠测量。误差分析表明:测量幅值误差<0.1%,相位误差<2°。已应用该系统对特高压交流试验基地分裂导线电晕电流和电晕损失进行测量,获得了6分裂、8分裂LGJ630-45型导线宽频带的电晕电流以及在干燥和淋雨(降雨强度20mm/h)条件下的电晕损失,表明该系统可以应用于宽频带电晕电流和电晕损失的测量。

In order to analyze wide frequency band corona current characteristics of ultra high voltage（UHV） bundled conductors and to calculate corona losses on the conductors, a wide-frequency band corona loss measurement system based on global positioning system（GPS） synchronous clock is developed. Synchronous collection of voltage and current signals is realized by the GPS technology. Corona current signals are transmitted to the lower computer through wireless network, which are safely and reliably measured. Results of error analysis prove that the test system has aptitude errors within 0.1% and phase errors less than 20°. The system has been applied in testing of corona current and corona loss of bundled conductors in the State Grid UHV AC Test Base of China, and the wide frequency band corona current and the corona loss under dry and rainy conditions（ with a rainfall ratio of 20 mm/h） of 6 bundled and 8 bundled LGJ630-45 conductors are gained. It is concluded that the presented system is capable of measuring wide frequency band corona currents and corona losses of conductors.