西藏某220 kV變電站接地網(wǎng)狀態(tài)評(píng)估與改造
權(quán)學(xué)政,李朝霞
(西藏農(nóng)牧學(xué)院,西藏 林芝 860000)
摘 要:利用CDEGS接地分析軟件對(duì)西藏某220 kV變電站接地網(wǎng)進(jìn)行狀態(tài)評(píng)估,從接地網(wǎng)的接地電阻、跨步電壓和接觸電壓進(jìn)行全面評(píng)估。提出把原接地網(wǎng)的外引接線改造成梯形接地網(wǎng),并加密梯形接地網(wǎng),且在最外端敷設(shè)10 m長(zhǎng)的垂直接地極的改造方案,改造效果表明,該方案使跨步電壓和接觸電壓滿足了安全限值,保證了人員安全和變電站安全運(yùn)行。
關(guān)鍵詞:220 kV 變電站;接地網(wǎng);狀態(tài)評(píng)估
中圖分類號(hào):TM645 文獻(xiàn)標(biāo)識(shí)碼:B 文章編號(hào):1007-3175(2019)01-0034-03
State Evaluation and Reform of Grounding Grid of 220 kV Substation in Tibet
QUAN Xue-zheng , LI Zhao-xia
(Tibet Agriculture and Animal Husbandry University, Linzhi 860000, China)
Abstract: The grounding analysis software CDEGS was used to evaluate the state of a 220 kV substation grounding grid in Tibet. This paper comprehensively evaluated the grounding resistance, step voltage and contact voltage of the grounding grid and proposed to transform the external lead wire of the original grounding grid into a trapezoidal grounding net, encrypting the trapezoidal grounding net, and set up a 10 m long vertical grounding pole at the outermost end to make the step voltage and contact voltage meet the safety limit, which ensures the personnel safety and substation safe operation.
Key words: 220 kV substation; grounding grid; condition evaluation
參考文獻(xiàn)
[1] 李謙. 電力系統(tǒng)接地網(wǎng)特性參數(shù)測(cè)量與應(yīng)用[M]. 北京:中國(guó)電力出版社,2013.
[2] 陳坤漢.500 kV橫瀝變電站接地網(wǎng)狀態(tài)評(píng)估與改造[J]. 電瓷避雷器,2011(3):61-64.
[3] 豆朋,龔瑛,張勁松,文習(xí)山. 利用CDEGS軟件對(duì)大型接地網(wǎng)進(jìn)行評(píng)估與改造的研究[J]. 電氣應(yīng)用,2007(4):2-4.
[4] 王如飛. 應(yīng)如何選擇變電站接地網(wǎng)降阻措施的探討[J]. 科技風(fēng),2017(22):176.
[5] 賈曉娟. 變電站接地網(wǎng)優(yōu)化設(shè)計(jì)及安全性評(píng)估[D]. 北京:華北電力大學(xué),2016.
[6] 電力工業(yè)部絕緣配合標(biāo)準(zhǔn)化技術(shù)委員會(huì). 交流電氣裝置的接地:DL/T 621—1997[S]. 北京:中國(guó)電力出版社,1997:1-3.
[7] 池麗鈞,成文杰,陳俊平,等. 變電站接地網(wǎng)優(yōu)化設(shè)計(jì)分析[J]. 江西電力職業(yè)技術(shù)學(xué)院學(xué)報(bào),2016,29(3):19-22.
[8] 李莉.500 kV變電站大型接地網(wǎng)狀態(tài)評(píng)估[D]. 廣州:華南理工大學(xué),2010.
[9] 李宇恒.35 kV變電站立體接地網(wǎng)設(shè)計(jì)問(wèn)題研究[J]. 機(jī)電工程技術(shù),2017,46(7):100-101.
[10] 王平,賈立莉,李守學(xué),李抗,律方成.110 kV全戶內(nèi)智能變電站接地網(wǎng)優(yōu)化設(shè)計(jì)[J]. 中國(guó)電力,2018,51(3):42-48.
[11] 王東燁,董剛. 大型變電所地網(wǎng)評(píng)估若干問(wèn)題的探討[J]. 高電壓技術(shù),2001,27(2):64-65.