高压线路雷击过电压实例分析

Instance analysis of lightning overvoltage in high voltage transmission line

首先论述了电力系统过电压分析的重要意义,详细分析了电力系统过电压的主要种类,介绍了绝缘配合的传统方法 ,为后面的过电压分析提供了理论基础。对电力系统过电压获得的数据进行了时域分析和频域分析,对现场收集到的过电压数据中一些典型的、频繁出现的过电压波形进行了分析,判断过电压的类型和产生的原因,这对于研究判断站内电气设备的绝缘强度、检修周期、设备改进和系统改造、过电压对高压送电线路的影响方式和程度以及过电压的防范等都具有重要的指导意义。在电力系统高压送电线路研究项目中应用取得初步成果。

Firstly, the significance of power system overvoltage analysis is discussed, and the main types of overvoltage in power system are analyzed in detail;the traditional method of insulation matching is introduced, which provides a theoretical basis for the following overvoltage analysis. The data analysis of power system overvoltage includes time domain analysis and frequency domain analysis. Some typical and frequent overvoltage waveforms in the overvoltage data collected in the field are analyzed, and the types and causes of overvoltage are judged. It has important guiding significance to study and judge the insulation strength of electrical equipment, maintenance cycle, equipment and system improvement, the mode and degree of influence of overvoltage on high voltage transmission line as well as the prevention of overvoltage.The preliminary results have been achieved in the research project of high voltage transmission line.