摘要
局部放电的发生伴随着电磁波的发射,电磁波在特高频段(300MHz^3GHz)的抗干扰能力很强,因此通过接受该频段的电磁波进行局部放电的检测与定位很有研究前景。近年来特高频法(ultra high frequency method,简称UHF)在局部放电的检测与定位工作中得到广泛推广。为改进确定时延的方法,准确定位放电源,采用了特高频法和信号传播时延来实现对局部放电源的定位。该法采用信号初始峰值法、相关法和能量最小值法求取信号传播时延,通过比较讨论3种方法的优劣,确定了一套求取时延的方案。最后用空间搜索法实现对缺陷中局部放电的定位。
PD goes with emission of electromagnetic wave, the wave in the ultra high spectrum has strong anti-jamming ability, so there is sunshiny future to detect the partial discharge By receiving the ultra high spectrum electro- magnetic wave. So far, the UHF method has been taken in the PD monitoring and location widely. The measurement of PD is a non destructive and sensitive diagnostic tool for the condition assessment of insulating systems. Two major tasks of PD measurements may be distinguished, the type of the PD and the location of the PD. The frontier of signals arrival contains some important information for the on-line monitoring system. The article discusses the location of PD origin by the UHF method based on arrival times. We can estimate the arrive time delay by comparing the wave, but the discharge wave form become terribly complex though the propagation , so it is difficult to ob tain the arrival time exactly, this paper evaluates different time-of-arrival algorithms in order to determine which method yields most accurate location under different circumstances. These methods are based on threshold, energy criterion, correlation in time domain. Finally, the study discover the new cumulative energy method is efficient to collection the time delay, and achieve the PD location by searching in space.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2009年第11期2680-2684,共5页
High Voltage Engineering
关键词
局部放电
特高频
时延
能量累积
空间搜索
定位
partial discharge（PD）
UHF
time delay
cumulative energy
searching in space
location
