本文選題：配電線路 + 感應(yīng)雷過(guò)電壓�。� 參考：《華北電力大學(xué)》2014年碩士論文

【摘要】：配電線路承擔(dān)著向各電力用戶輸送電能的任務(wù),配電線路的故障將導(dǎo)致電力系統(tǒng)供電可靠性和穩(wěn)定性受到嚴(yán)重影響。諸暨市地處浙江省中北部,人口眾多,工商業(yè)分布密集,在2013年中國(guó)最富有的縣級(jí)市排名第二位。為保障諸暨地區(qū)生活生產(chǎn)用電,該地區(qū)10千伏配電網(wǎng)規(guī)模龐大。 據(jù)浙江省氣象局統(tǒng)計(jì),諸暨市供電公司配電網(wǎng)所處地理位置諸暨市的落雷密度位居全省前列,是全省雷害最嚴(yán)重的地區(qū),年雷暴日達(dá)到40以上,最高年份接近50。因配電網(wǎng)絕緣水平較低,線路運(yùn)行環(huán)境復(fù)雜,防雷措施不完善,該地區(qū)配網(wǎng)運(yùn)行可靠性受雷害影響嚴(yán)重。因此,對(duì)諸暨地區(qū)配電線路防雷技術(shù)進(jìn)行分析,提出有效改進(jìn)措施是該地區(qū)供電系統(tǒng)提升供電可靠性的工作重點(diǎn)。 1.本文通過(guò)對(duì)諸暨市電網(wǎng)近年來(lái)的雷害情況相關(guān)資料進(jìn)行雷害分布和規(guī)律統(tǒng)計(jì)分析。同時(shí)對(duì)該地區(qū)桿塔接地電阻、桿塔結(jié)構(gòu)參數(shù)、線路參數(shù)和所在地區(qū)土壤電阻率進(jìn)行了測(cè)量。最后對(duì)該地區(qū)配網(wǎng)線路雷擊跳閘率高的原因進(jìn)行分析總結(jié)。 2.10kV配電線路發(fā)生的雷害事故大部分是由感應(yīng)雷過(guò)電壓造成的。本文通過(guò)理論分析計(jì)算,對(duì)諸暨地區(qū)配電線路感應(yīng)雷過(guò)電壓進(jìn)行了計(jì)算并得出結(jié)論。最終給出避雷器安裝方式優(yōu)化建議。 3.利用技術(shù)外委模式,使用電磁暫態(tài)計(jì)算程序EMTP-ATP建立了10kV配電線路仿真對(duì)計(jì)算模型,分別對(duì)雷擊桿塔頂和雷擊導(dǎo)線兩種情況的線路耐雷水平進(jìn)行了仿真計(jì)算,通過(guò)仿真結(jié)果進(jìn)一步給出諸暨地區(qū)避雷器安裝方式合理建議。 4.進(jìn)一步通過(guò)仿真,對(duì)過(guò)電壓保護(hù)器性能分析。并針對(duì)現(xiàn)有過(guò)電壓保護(hù)器羊角電極容易造成外間隙距離誤差的情況,對(duì)其進(jìn)行改進(jìn),將羊角電極改造成為了環(huán)形電極。優(yōu)化了過(guò)電壓保護(hù)器安裝流程,提升了安裝速度,減少因安裝工藝而導(dǎo)致的羊角電極間隙距離的誤差發(fā)生幾率。
[Abstract]:The distribution line is responsible for transmitting electric energy to the power users. The failure of the distribution line will seriously affect the reliability and stability of the power supply system. Located in central and northern Zhejiang Province, Zhuji has a large population and dense industrial and commercial distribution, ranking second among China's richest county-level cities in 2013. In order to protect Zhuji area life production electricity, this area 10 kV distribution network scale is huge. According to the statistics of Zhejiang Meteorological Bureau, Zhuji power supply company distribution network is located in the geographical position of Zhuji City, which has the highest lightning drop density in the province, and is the most serious area of the province, with annual thunderstorm days reaching more than 40 days and the highest year approaching 50%. Due to the low insulation level of distribution network, complex operation environment and imperfect lightning protection measures, the reliability of distribution network in this area is seriously affected by lightning damage. Therefore, the lightning protection technology of distribution line in Zhuji area is analyzed, and the effective improvement measures are put forward to improve the reliability of power supply system in this area. 1. In this paper, the distribution and regularity of lightning damage in Zhuji power grid in recent years are analyzed. At the same time, the grounding resistance of the tower, the structural parameters of the tower, the line parameters and the soil resistivity in the area were measured. Finally, the causes of high lightning tripping rate of distribution lines in this area are analyzed and summarized. Most of the lightning damage accidents on 2.10 kV distribution lines are caused by induced lightning overvoltage. In this paper, the induced lightning overvoltage of distribution lines in Zhuji area is calculated by theoretical analysis and calculation, and a conclusion is drawn. Finally, the optimal installation mode of arrester is suggested. 3. Using EMTP-ATP, a simulation calculation model of 10 kV distribution line is established by using the EMTP-ATP program. The lightning resistance level of the transmission line is simulated in the case of the top of the lightning tower and the lightning strike wire, respectively. Through the simulation result, the reasonable suggestion of installation mode of arrester in Zhuji area is given. 4. Furthermore, the performance of the overvoltage protector is analyzed by simulation. Aiming at the situation that the current overvoltage protector can easily cause the distance error of the outer gap, it is improved to transform the horn electrode into a ring electrode. The installation process of overvoltage protector is optimized, the installation speed is increased, and the error probability of the gap distance between the sheep-angle electrodes caused by the installation process is reduced.
【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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本文編號(hào)：2044583