【摘要】：蓬勃發(fā)展的經(jīng)濟(jì)促進(jìn)了對電力供應(yīng)需求的穩(wěn)定增長,近年來我國生產(chǎn)生活用電需求呈逐年增加的趨勢。變電站作為電力系統(tǒng)的核心組成部分,其運(yùn)行是否安全可靠直接影響到整個(gè)電網(wǎng)的穩(wěn)定。然而實(shí)際變電站容易因故障而停運(yùn),其中雷擊災(zāi)害是變電站事故的主要元兇。一旦發(fā)生因雷擊造成的變電站故障,容易引起大范圍失去電力供應(yīng),此外,大部分變電站設(shè)備不具備絕緣自恢復(fù)能力,一旦設(shè)備故障,將難以恢復(fù)供電。對變電站遭受雷擊情況進(jìn)行分析,有助于指導(dǎo)變電站雷害防護(hù)措施。在這樣背景下,本文采用了 ATP仿真軟件作為研究工具,研究了山東日照招賢220 kV GIS變電站遭受雷擊后的過電壓特征情況,并對幾種降低過電壓措施效果進(jìn)行了計(jì)算,為該變電站雷擊防護(hù)提供了數(shù)據(jù)支撐。全文研究內(nèi)容概述如下:全文主要包括三大部分,第一部分是模型搭建,建立了包含輸電線路、雷電波、站內(nèi)設(shè)備、桿塔、沖擊接地電阻、絕緣子閃絡(luò)模型的變電站雷擊侵入模型,其中對絕緣子閃絡(luò)進(jìn)行重點(diǎn)分析,通過軟件TACTS模塊完成了該物理過程的模擬;第二部分是計(jì)算分析,計(jì)算了不同雷擊點(diǎn)、沖擊接地電阻、運(yùn)行方式以及保護(hù)距離等多因素對過電壓數(shù)值的影響;第三部分為降低雷過電壓措施分析,首先對220 kV GIS變電站避雷器配置特點(diǎn)進(jìn)行了描述,然后分析幾種不同配置方案下設(shè)備過電壓水平,并結(jié)合該變電站接線特點(diǎn),最后提出了適用于該變電站降低雷擊過電壓的避雷器配置方法。
[Abstract]:The booming economy has promoted the steady growth of the demand for electricity supply. In recent years, the demand for electricity for production and daily use in our country has been increasing year by year. Substation as the core part of power system, its operation safety and reliability directly affect the stability of the entire power grid. However, substation is easy to be shut down because of failure, and lightning disaster is the main culprit of substation accident. Once the substation failure caused by lightning strike occurs, it is easy to lose the power supply in a large area. In addition, most substation equipments do not have the ability of self-recovery of insulation, once the equipment fails, it will be difficult to restore the power supply. The analysis of the lightning strike situation of the substation is helpful to guide the protection measures of the substation lightning damage. Under this background, this paper uses the ATP simulation software as the research tool, studies the overvoltage characteristic of Rizhao Zhaoxian 220 kV GIS substation after the lightning strike, and calculates the effect of several measures to reduce the overvoltage. It provides data support for the lightning protection of the substation. The main contents of this paper are summarized as follows: the first part is model building, which includes transmission line, lightning wave, station equipment, pole tower, impulse grounding resistance. The insulator flashover model of substation lightning attack model, in which the insulator flashover is analyzed emphatically, and the simulation of the physical process is completed by the software TACTS module. In the second part, the effects of different lightning strike points, impulse grounding resistance, operation mode and protection distance on the value of overvoltage are calculated. In the third part, the characteristics of lightning arrester configuration in 220 kV GIS substation are described firstly, and then the equipment overvoltage level under several different configuration schemes is analyzed, and combined with the connection characteristics of the substation, the third part is the analysis of the measures to reduce the lightning overvoltage. Finally, a lightning arrester configuration method suitable for reducing lightning overvoltage in the substation is proposed.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM863

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本文編號：2311618