摘要
传统的局部放电检测方法,由于测量频带窄、抗干扰能力差、信息量少,已经不能满足变压器局部放电检测(特别是在线检测)的需要,因此,近年来提出的超高频检测技术得到了较快的发展.根据GIS中超高频检测的经验,并结合变压器的结构和放电特性,该文研制了一种宽带超高频传感器,其有效带宽为500～1500 MHz.用天线理论对该传感器的特性加以分析并在实验室中进行了性能实测,结果表明该传感器具有良好的使用特性.该文用该传感器研究局部放电信号,在其有效频率范围内可以精确地提取放电发射的电磁信号,从而为进一步研究超高频局部放电检测技术在变压器中的应用奠定了基础.
The traditional PD detection methods could not meet the requirement of PD detection for power transformer (especially for on-line monitoring), because of their narrow measuring band, poor anti-interference performance and less information. The ultra-high-frequency (UHF) PD detection method has been newly put forward. According to the detection experience in GIS and the discharge characteristics in power transformer, authors design and develop a kind of UHF sensor, namely, two-wire Archimedian planar spiral antenna. The effective wide band of the sensor is 500~1500 MHz. Then the characteristics of this sensor are analyzed by the antenna theory and measured in laboratory, and it is shown that the sensor has superior performance characteristics. In this paper, the sensor is also applied to measure PD signals in transformer oil, results show that it can be used to detect the UHF PD signals in effective frequency band, which is very useful for laying foundations on setting UHF PD detection in power transformer.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2002年第4期154-160,共7页
Proceedings of the CSEE
关键词
电力变压器
超高频传感器
绝缘
局部放电
检测
power transformer
partial discharge
ultra-high-frequency (UHF) detection
two-wire Archimedian planar spiral antenna
