【作者】 陈中豪；

【导师】 郝艳捧； 秦锋明；

【作者基本信息】 华南理工大学 ， 工程硕士（专业学位）， 2016， 硕士

【摘要】 线路上的雷电过电压一旦造成绝缘击穿,容易引起电力系统停电事故,因而受到广泛关注。目前,广州110kV城市电网已逐渐普遍通过电缆终端塔实现由架空线路转接电缆的方式,这将带来架空线可能产生雷电过电压侵入电缆系统及变电站的问题。传统的110kV变电站设计中,对其电缆进线采用规程法,这种机械地套用技术规范的方法难以度量可能出现的危害最大的雷电过电压,也难以评估流经电缆系统过电压时的影响。本文提出了一种基于110kV电缆典型进线方式的仿真分析方法,进而全面把握110kV电缆典型进线系统雷电过电压时电缆系统动态特性,为其防雷提供保护策略,相关工作对于提高设备的安全性和供电可靠性,减少故障频率,对保障电力系统安全、可靠运行,提高设备绝缘寿命及工程经济效益等具有重要意义。本文主要完成了以下主要工作:首先,简要介绍广州地区雷害及线路防雷情况,并分析了110kV变电站进线架空线路转为短电缆的典型输电型式的特点。其次,简要介绍雷电波过程的理论及过电压计算方法,选择PSCAD/EMTDC作为核心工具,搭建了适用于110kV电缆护层雷电过电压分析的仿真模型。再次,在所搭建的110kV电缆护层雷电过电压分析的PSCAD/EMTDC仿真模型上,深入研究电缆护层的最大雷电过电压水平以及相应保护器的负载情况,全面把握雷电过电压的动态特性,并提出相应的过电压保护设计方案。最后,结合工程实际,提出了完善110kV变电站电缆进线防雷保护系统三道防线架构方案的建议,并指出了需要验算后可优化接地线及回流线绝缘裕度。本文的研究工作为110kV电缆典型进线系统下的雷电过电压研究奠定了基础,对于相应接线方式下的电力线路防雷提供了良好的参考价值。更多还原

【Abstract】 Once the overvoltage lightning on the line caused insulation breakdown,it easily lead to power system power outages,which has been widespread concerned.Presently,Guangzhou City 110 kV power grid has gradually adopted the cable terminal tower type from the overhead line conversion cable,which will lead that the over-voltage lightning of the overhead line have a chance to hit the cable system and substation.Traditionally,110 kV substation design adopted the method of the specification.This method mechanically calculate the general value of overvoltage lightning,which could not calculate the maximum of lightning overvoltage and assess its influences.In this paper,a simulation analysis method based on GuangZhou area topical 110 kV cable is proposed to analyse the dynamic characteristics of cable system in an inlet line of 110 kV cable and provide a protection strategy for the lightning protection of the 110 kV cable.The related work is to improve the safety of equipment and the reliability of power supply,Not only could the method reduce the frequency of failure,but also it protect the power system security and the reliable operation.Finally it improve equipment insulation life and engineering economic benefit is of great significance.This paper mainly completed the following main work:First of all,it briefly introduced the lightning damage in Guangzhou area and the characteristics of the 110 kV substation’s incoming lines transmitted from the overhead line into short cable.Secondly,it focused on the theory of lightning wave process and the calculation method of overvoltage.PSCAD / EMTDC is selected as the core tool to build a simulation model for the analysis of overvoltage lightning in 110 kV cable sheath.Thirdly,based on PSCAD / EMTDC simulation model of lightning overvoltage,it analysed the maximum overvoltage lightning level of cable sheath and the different load of corresponding protector.The dynamic characteristics of overvoltage lightning are comprehensively grasped.Then it put forward the corresponding overvoltage protection design scheme.At last,the three-line defence scheme of 110 kV substation cable incoming lightning protection system is suggested to put forward.The insulation of earthing and returning line could be optimized after checking calculation.The research work in this paper lays the foundation for the study of overvoltage lightning in a typical incoming line system of 110 kV cable and provides a good reference value for the lightning protection of the corresponding wiring mode.更多还原