基于无线通信技术的XLPE电缆局部放电在线监测系统的研究

发布时间：2018-09-11 13:45

【摘要】：随着城市规模的不断扩大以及电力电缆在电力系统中的应用越来越广泛,供电的可靠性也越来越受供电部门和电力用户的关注。现有的电力电缆线路都是通过定期的检修和事故后的检测来进行维护的,这就增加了电缆故障的持续时间,耗费大量的人力去查找故障点,降低了电缆检修的效率。本文提出了基于无线通信技术的故障实时监测方法,可以有效提高电缆故障的处理速度。本文对高压电缆局部放电在线监测方法进行了系统研究,设计了一套针对电缆的在线监测系统。首先对电力电缆的局部放电建立模型,通过对接头提取超高频信号的方法来监测电缆的运行情况。在此基础上,设计了一套针对超高频信号检测处理的无线传输系统,实现了对故障信号及时有效的传输并介绍了超高频信号在电缆线路中的传播特性。其次,针对系统进行了硬件模块化的设计,使得整体结构清晰明了,主要包括了:数据采集电路、主控电路、GPRS模块电路、电源电路。在数据传输过程中采用了地下有线传输,地上无线传输的相互配合的方案,解决了无线信号在地下传输困难的问题。最后,本文分析了电缆存在缺陷时的电压的特点,介绍了电缆缺陷识别的基本方法。此外,经过对系统的硬件和软件调试,验证了该系统的有效性。
[Abstract]:With the continuous expansion of city scale and the application of power cable in power system, the reliability of power supply has been paid more and more attention by power supply departments and users. The existing power cable lines are maintained through regular maintenance and post-accident detection, which increases the duration of cable faults, consumes a lot of manpower to find fault points, and reduces the efficiency of cable maintenance. This paper presents a real-time fault monitoring method based on wireless communication technology, which can effectively improve the processing speed of cable faults. In this paper, the on-line monitoring method of partial discharge of high voltage cable is studied systematically, and a set of on-line monitoring system for cable is designed. Firstly, the partial discharge model of power cable is established, and the UHF signal is extracted from the joint to monitor the operation of the cable. On this basis, a wireless transmission system for UHF signal detection and processing is designed, which realizes the timely and effective transmission of fault signal and introduces the propagation characteristics of UHF signal in cable line. Secondly, the hardware modularization is designed for the system, which makes the whole structure clear and clear, mainly including: data acquisition circuit, main control circuit, GPRS module circuit, power circuit. In the process of data transmission, the scheme of underground wire transmission and ground wireless transmission is adopted, which solves the problem of wireless signal transmission in underground. Finally, this paper analyzes the characteristics of the voltage when the cable is defective, and introduces the basic method of cable defect identification. In addition, after debugging the hardware and software of the system, the effectiveness of the system is verified.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM855

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