GIS局部放电特高频检测系统标定方法体系研究

发布时间：2018-05-13 02:07

本文选题：气体封闭组合开关 + 局部放电　；参考：《华北电力大学(北京)》2017年硕士论文

【摘要】：局部放电特高频检测技术已在GIS局部放电检测中得到广泛应用,其检测系统灵敏度对GIS局部放电的检测效果至关重要。目前针对UHF检测仪器的灵敏度校核有实验室校核和现场校核。其中实验室校核采用GTEM小室标定检测系统的可测场强已被纳入电力标准,但在计量领域,国内外尚且没有针对脉冲场强进行一致性测量的标准,研究局部放电特高频标定的场强溯源十分必要,现场校核主要受到传感器的布置及脉冲注入水平的影响。针对上述问题,本文做了以下研究:理论分析了单极探针的传递函数,并通过仿真与理论值进行对比,相似度达到96%以上,为进一步提高测试精度,对探针的安装法兰进行了设计。采用向GTEM小室注入扫频和脉冲信号两种方式对场强进行溯源。扫频信号下,通过实测电场与单极探针计算结果进行对比,误差在8%以内,验证了单极探针标定稳态场强的正确性;在脉冲信号下,采用CST仿真与探针计算场强进行对比,场强峰值误差为1.7%,论证了单极探针标定脉冲场强的正确性。现场校核方面通过对110kV、220kV、500kVGIS局部放电及模拟脉冲注入下UHF信号的传播衰减特性、不同传感器安装方式下UHF信号的注入效率、检测系统灵敏度等的研究,在此基础上提出了现场校核脉冲注入水平的计算方法,并开发了相关软件。最后基于以上研究提出了110kV、220kV、500kV典型GIS上UHF传感器的布置方案,并分析了不同配置方案下的UHF检测系统覆盖范围。
[Abstract]:Partial discharge UHF detection technology has been widely used in GIS partial discharge detection. The sensitivity of the detection system is very important to the detection effect of GIS partial discharge. At present, there are laboratory and field check for sensitivity check of UHF detection instrument. The measurable field strength of the calibration and detection system using GTEM cell has been included in the electric power standard, but in the field of measurement, there is no standard for consistency measurement of pulse field intensity at home and abroad. It is necessary to study the source of the field strength of PD UHF calibration. The field checking is mainly affected by the sensor arrangement and the level of pulse injection. In view of the above problems, this paper has done the following research: the transfer function of monopole probe is analyzed theoretically, and compared with the theoretical value by simulation, the similarity is over 96%, in order to further improve the testing accuracy, The installation flange of the probe is designed. The source of field intensity was traced by injecting sweep frequency and pulse signal into GTEM cell. By comparing the measured electric field with the calculation results of monopole probe, the error is less than 8%, which verifies the correctness of calibrating the steady-state field intensity of monopole probe, and contrasts with the calculation of field intensity by CST simulation under pulse signal. The peak error of field intensity is 1.7, which proves the correctness of unipolar probe calibration of pulse field intensity. In field checking, the propagation and attenuation characteristics of UHF signal under 110kV / 220kV / 500kVGIS partial discharge and analog pulse injection, the injection efficiency of UHF signal under different sensor installation modes and the sensitivity of the detection system are studied. On the basis of this, the calculation method of field checking pulse injection level is put forward, and the related software is developed. Finally, based on the above research, the layout scheme of UHF sensors on 110kV / 220kV / 500kV typical GIS is proposed, and the coverage of UHF detection system under different configuration schemes is analyzed.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM595

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