高压XLPE电缆中间接头局部放电传感器的研究

发布时间：2018-05-06 20:08

本文选题：电力电缆 + 中间接头　；参考：《华北电力大学(北京)》2014年硕士论文

【摘要】：电缆中间接头是绝缘事故的高发部位,研究电缆中间接头局部放电传感器,实现对电缆中间接头局部放电的在线监测,可以实时掌握运行状态下电缆中间接头的局放水平,记录电缆中间接头局放发展过程和趋势,从而判断中间接头的绝缘水平,为状态检修提供依据,避免绝缘故障的发生。本文首先制作了电缆中间接头典型的针尖和气隙缺陷物理模型,采用宽带检测阻抗测量了两种缺陷的局放原始波形,建立了两种缺陷局放波形的数学模型,从波形和频谱误差两个方面验证了数学模型的正确性。然后,采用有限积分法仿真分析了电缆中间接头内部电磁波的传播特性,包括内部电磁场传播模式和衰减特性,为传感器的安装位置选择和频带选择提供依据。建立了传感器和中间接头一体化模型,通过数值计算可以直接得到传感器输出信号,从而可以根据输出信号优化传感器结构,并在35kV电缆中间接头内部设置针尖缺陷,通过实验验证了建模方法的可行性。最后,根据110kV电缆中间接头的实际结构,设计了内置式局部放电传感器,建立传感器和中间接头一体化模型,采用有限积分法优化传感器的尺寸结构,并开展实验验证了传感器安装和测量的可行性。
[Abstract]:The cable intermediate joint is the high occurrence part of the insulation accident. The partial discharge sensor of the cable intermediate joint can be studied to realize the on-line monitoring of the cable intermediate joint partial discharge, and the partial discharge level of the cable intermediate joint can be grasped in real time. The development process and trend of partial discharge of cable intermediate joints are recorded, so as to judge the insulation level of the intermediate joints, to provide the basis for condition maintenance and to avoid insulation faults. In this paper, the typical physical models of tip and air gap defects of cable intermediate joints are first made. The partial discharge waveforms of two kinds of defects are measured by wideband detection impedance, and the mathematical models of partial discharge waveforms of two defects are established. The correctness of the mathematical model is verified from waveform and spectrum error. Then, the finite integration method is used to simulate and analyze the propagation characteristics of the electromagnetic wave in the cable interconnect, including the propagation mode and attenuation characteristics of the internal electromagnetic field, which provides the basis for the selection of the installation position and the frequency band of the sensor. The integrated model of sensor and intermediate joint is established, the sensor output signal can be obtained directly by numerical calculation, and the sensor structure can be optimized according to the output signal, and the tip defect is set up inside the middle joint of 35kV cable. The feasibility of the modeling method is verified by experiments. Finally, according to the actual structure of 110kV cable intermediate joint, the built-in partial discharge sensor is designed, the integrated model of sensor and intermediate joint is established, and the size structure of sensor is optimized by finite integration method. Experiments were carried out to verify the feasibility of sensor installation and measurement.
【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】：2014
【分类号】：TP212;TM855

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