基于UHF法的GIS典型缺陷局部放电信号传播特性研究

发布时间：2018-04-01 08:28

本文选题：特高频法　切入点：XFDTD仿真软件　出处：《北京交通大学》2014年硕士论文

【摘要】：随着智能电网技术的日臻成熟以及用户对供电可靠性要求的不断提高,GIS以其安全性、可靠性和维护周期长的优点在电力系统中的应用越来越广泛。GIS在运行中的故障主要以绝缘故障为主,而对绝缘故障的检测主要是以检测局部放电为主。特高频法通过检测局部放电激发的特高频段(1500MHz～3000MHz)信号,具有很好抗干扰性,是检测GIS局部放电比较理想的方法。为了研究在线监测的特高频传感器的合理布局方案,本文对电磁波信号在GIS内的传播和衰减特性进行了研究。为了研究电磁波信号的传播特性,本文使用XFDTD仿真软件对GIS模型进行了分析研究。首先使用CREO2.0搭建GIS实体模型,并将其导入XFDTD.跟传统仿真采用高斯脉冲比较,本文采用了实测的典型缺陷放电脉冲作为激励源导入软件。将五种典型缺陷放电脉冲和高斯脉冲信号作为激励源研究其在GIS内传播的差异。由于其放电可靠性和接近理想脉冲,本文采用高压导体上的尖端放电脉冲作为激励源研究电磁波信号经过直腔体、绝缘子、L型分支和T型分支的衰减情况。同时研究了不同内径的外壳和内导杆以及不同长度的腔体对电磁波传播特性的影响。为了使研究更具准确性,本文设计了电晕缺陷和悬浮电位缺陷两种典型缺陷模型,将其放入到北京电科院电缆屏蔽实验室的专用GIS模拟腔体中,逐步加压使其放电。使用英国DMS超高频检测仪检测,观察三维PRPD图观测到发生了局部放电。使用系统自带的三只内置式特高频传感器检测局部放电产生的电磁波,并用示波器进行分析和处理。然后对GIS模拟腔体进行了仿真计算,将仿真结果跟试验结果对比分析,进一步验证结论的正确性。
[Abstract]:With the maturity of smart grid technology and the continuous improvement of users' demand for power supply reliability, GIS has its security. The advantages of reliability and long maintenance period are more and more widely used in power system. The fault of GIS in operation is mainly insulation fault. The detection of insulation faults is mainly to detect partial discharge. UHF method has good anti-jamming ability by detecting the ultra-high frequency (1500 MHz ~ 3000MHz) signal excited by partial discharge. It is an ideal method to detect partial discharge in GIS. In order to study the reasonable layout of UHF sensor for on-line monitoring, the propagation and attenuation characteristics of electromagnetic wave signal in GIS are studied in this paper. In order to study the propagation characteristics of electromagnetic wave signal, the GIS model is analyzed and studied by using XFDTD simulation software. Firstly, the GIS solid model is built with CREO2.0 and imported into XFDT D.It is compared with Gao Si pulse in traditional simulation. In this paper, five typical defect discharge pulses and Gao Si pulse signals are used as excitation sources to study the difference between the five typical defect discharge pulses and Gao Si pulse signals in GIS. Because of their discharge reliability and close to ideal pulse, the paper uses the measured typical defect discharge pulse as the excitation source. In this paper, the tip discharge pulse on a high voltage conductor is used as an exciting source to study the electromagnetic wave signal passing through a straight cavity. The attenuation of the L-type and T-type branches of insulator is studied. The influence of the outer shell and the inner guide rod with different inner diameters and the cavity of different length on the propagation characteristics of electromagnetic wave is also studied. In order to make the research more accurate, this paper designs two typical defect models: corona defect and suspension potential defect, and puts them into the special GIS analog cavity of Cable shielding Laboratory of Beijing Electric Institute. Using the DMS UHF detector in the UK to detect and observe the partial discharge (PD) in three dimensional PRPD diagrams. Three built-in UHF sensors with the system are used to detect the electromagnetic waves generated by partial discharge. The simulation results of the GIS cavity are compared with the experimental results, and the correctness of the conclusions is further verified.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM595;TM855

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