【摘要】：輸電線路雷電過電壓導(dǎo)致的絕緣閃絡(luò)在電力系統(tǒng)事故中占很大比例，因此對(duì)輸電線路進(jìn)行防雷性能評(píng)估就成為電力線路設(shè)計(jì)部門的重要任務(wù)。準(zhǔn)確對(duì)輸電線路桿塔及桿塔基礎(chǔ)進(jìn)行精細(xì)建模，分析研究桿塔在雷電波下的沖擊特性，研究桿塔自身基礎(chǔ)型式、接地體、根開、土壤電阻率等對(duì)桿塔在雷電波下過電壓分布的影響，，并進(jìn)一步計(jì)算桿塔耐雷水平和雷擊跳閘率，從而提出降低桿塔雷電過電壓分布措施具有重要的指導(dǎo)意義和工程應(yīng)用價(jià)值。 本文以220kV輸電線路桿塔及基礎(chǔ)為對(duì)象，研究了其建模方法，并對(duì)雷擊下的沖擊特性進(jìn)行分析，主要研究?jī)?nèi)容包括： （1）總結(jié)了220kV輸電線路桿塔塔身建模方法，并采用多波阻抗模型對(duì)220kV典型輸電線路桿塔塔身結(jié)構(gòu)進(jìn)行建模； （2）采用電磁場(chǎng)數(shù)值計(jì)算方法對(duì)220kV輸電線路桿塔基礎(chǔ)的接地等效阻抗進(jìn)行了計(jì)算，基于等效阻抗通過電路優(yōu)化方法建立了桿塔基礎(chǔ)的等效電路，并對(duì)影響基礎(chǔ)接地阻抗的各種因素進(jìn)行了分析； （3）基于輸電線路桿塔及基礎(chǔ)等效電路，對(duì)220kV輸電線路桿塔雷擊特性進(jìn)行仿真計(jì)算，重點(diǎn)計(jì)算了基礎(chǔ)型式、接地體、根開、土壤電阻率對(duì)桿塔雷電過電壓分布的影響；基于計(jì)算結(jié)果，進(jìn)一步討論了降低雷擊輸電桿塔過電壓分布的措施。
[Abstract]:The insulation flashover caused by lightning overvoltage of transmission lines accounts for a large proportion of power system accidents, so it is an important task for power line design departments to evaluate the lightning protection performance of transmission lines. Accurately modeling the transmission line tower and its foundation, analyzing the impact characteristics of the tower under the lightning wave, studying the foundation type of the tower itself, earthing body, root opening, etc. The effect of soil resistivity on the overvoltage distribution of the tower under lightning wave and the calculation of lightning resistance level and lightning tripping rate of the tower are further calculated. Therefore, the measures to reduce the lightning overvoltage distribution of the tower have important guiding significance and engineering application value. In this paper, the modeling method of 220kV transmission line tower and its foundation are studied, and the impact characteristics under lightning strike are analyzed. The main research contents are as follows: (1) summarize the modeling method of 220kV transmission line tower. The multi-wave impedance model is used to model the tower structure of 220kV transmission line. (2) the grounding equivalent impedance of the tower foundation of 220kV transmission line is calculated by using the electromagnetic field numerical method. The equivalent circuit of tower foundation is established by circuit optimization method based on equivalent impedance, and various factors affecting the grounding impedance of base are analyzed. (3) based on transmission line tower and foundation equivalent circuit, The lightning strike characteristics of tower of 220kV transmission line are simulated, and the effects of foundation type, grounding body, root opening and soil resistivity on lightning overvoltage distribution of tower are calculated. Furthermore, the measures to reduce the overvoltage distribution of lightning strike transmission tower are discussed.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM863

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