基于可移动特高频天线阵列的变电站站域放电源检测与定位研究

发布时间：2018-01-15 03:23

本文关键词：基于可移动特高频天线阵列的变电站站域放电源检测与定位研究　出处：《中国电机工程学报》2017年10期 　论文类型：期刊论文

【摘要】：基于特高频天线阵列的局部放电检测方法已被应用于敞开式变电站(air-insulated substations,AIS)站域的局部放电巡检,但目前装置存在定位精度低等缺点。该文针对变电站局部放电去噪方法、传感器阵列优化布置、定位算法及检测系统开发等方面开展了深入研究。针对电晕噪声、手机通讯信号及非脉冲噪声,提出了合理选取检测频带、硬件陷波器及能量陡度阈值等去噪方法;通过克拉美罗下界分析及定位均方根误差仿真对天线阵列布置进行了优化,选取为4×1m的菱形天线阵;采用基于最大似然估计的概率定位法求解时差定位方程组,综合多次局部放电信号定位结果,可降低时差估计误差的影响,提高了定位准确度。开发了变电站局部放电检测与定位系统,包括超宽带全向双锥天线、信号调理电路及信号高速采集分析单元,用于110kV AIS站域局部放电检测,测试结果验证了系统的有效性及定位准确性。
[Abstract]:UHF partial discharge detection method based on antenna array has been applied to open type substation (air-insulated substations AIS) partial discharge inspection station domain, but the device has low positioning accuracy. In this paper, partial discharge denoising method for substation, sensor array optimization, to carry out in-depth study of the localization algorithm and detection system the development of other aspects. For corona noise, mobile phone signal and non impulse noise, put forward the reasonable selection of hardware detection band, notch filter and energy gradient threshold denoising method; the Cramer Rao lower bound analysis and positioning of the root mean square error of antenna array simulation layout has been optimized, selected for the diamond antenna array of 4 * 1m the group; probabilistic localization method for solving the time difference location equation based on maximum likelihood estimation, integrated multiple PD location results, can reduce the estimation error when the difference The effect, to improve the positioning accuracy. The development of the detection and location of partial discharge system of substation, including ultra wideband omnidirectional antenna, signal conditioning circuit and signal acquisition and analysis unit for 110kV station AIS domain partial discharge detection, the test results verify the validity and accuracy of the positioning system.

【作者单位】：电力设备电气绝缘国家重点实验室(西安交通大学);
【基金】：国家自然科学基金项目(51521065) 国家电网公司科技项目(5226SX15001R)~~
【分类号】：TM63;TM855
【正文快照】： 0引言局部放电(以下简称局放)检测是电力设备绝缘状态评估的重要手段[1-3]。特高频法(ultra-highfrequency,UHF)具有抗干扰性能佳及可实现放电源定位等优点,近年来得到了国内外的普遍认可[4-6]。目前国内外开展的UHF局放检测,通常都是将传感器固定安装在气体绝缘组合电器

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