电网技术Issue(3)：817-823,7.DOI:10.13335/j.1000-3673.pst.2014.03.042
特高频电磁波在变压器放油管道内的传播规律
The Attenuation of UHF Signals When Passing Through Transformer Oil-Valve
陈金祥1
作者信息
- 1. 国网福建省电力有限公司电力科学研究院，福建省 福州市 350007
- 折叠
摘要
Abstract
Oil-valve style ultra-high-frequency (UHF) method applies to on line detecting partial discharges (PDs) in transformers. The frequency band and position of UHF detection equipment are the two key factors that affect its sensitivity. The round waveguide theory is used to analyze UHF propagation characters, simulations and experiments are carried out to study the propagation and attenuation of UHF in oil-valve. Research works show that the frequency components of UHF electromagnetic wave lower than the cutoff frequency of TE11 wave attenuates seriously in oil-valve, while the rest of frequency components almost no attenuation. A method was proposed to improve the sensitivity of Oil-valve style UHF detecting system, that is, the sensor should be placed as close as possible to the inner wall of the transformer; the lower cut-off frequency of the detecting system should not be lower than the cutoff frequency of the dominant mode. These conclusions are important to improve on line PD detection technique in transformers.关键词
变压器/局部放电/带电检测/特高频/放油阀Key words
transformer/partial discharge/on line detection/ultra-high-frequency/oil-valve分类
信息技术与安全科学引用本文复制引用
陈金祥..特高频电磁波在变压器放油管道内的传播规律[J].电网技术,2014,(3):817-823,7.
