【摘要】：我國特高壓變電站進(jìn)線段同塔雙回轉(zhuǎn)角耐張塔采用剛性跳線,使得地線對跳線端部的保護(hù)角偏大,可能增加轉(zhuǎn)角耐張塔的雷電繞擊風(fēng)險。為降低雷電繞擊對變電站設(shè)備安全的影響,建立了特高壓同塔雙回路耐張轉(zhuǎn)角塔雷電繞擊先導(dǎo)發(fā)展3維模型。通過計算分析地線、跳線和導(dǎo)線最易產(chǎn)生上行先導(dǎo)的位置,獲得了不同線路轉(zhuǎn)角和地線橫擔(dān)長度時,剛性跳線的最大繞擊電流和繞擊閃絡(luò)率。結(jié)果表明:只需控制地線對相鄰檔距導(dǎo)線的保護(hù)角滿足≤ 5°,即可保證剛性跳線單回閃絡(luò)率滿足≤0.1次/(100km·a)的要求,而無需對剛性跳線端部的保護(hù)角進(jìn)行控制;SJ322P型桿塔外角側(cè)地線橫擔(dān)長度可由電氣幾何模型推薦的36 m減小至28 m,內(nèi)角側(cè)地線橫擔(dān)長度可由27 m減小至25 m。相關(guān)分析結(jié)論已應(yīng)用于1 000 kV錫盟—勝利特高壓交流輸電工程線路防雷設(shè)計。
[Abstract]:Rigid jumper is used in the same tower and double rotation angle tensioning tower in UHV substation in our country, which makes the protection angle of the ground wire to the jumper end larger, which may increase the risk of lightning winding of the turret. In order to reduce the influence of lightning wound failure on substation equipment safety, a 3D model for the development of lightning wound failure pilot in UHV tower with double loop tension angle is established. Through the calculation and analysis of the position where the ground wire, jumper wire and wire are most likely to lead up, the maximum current and flashover rate of the rigid jumper wire are obtained when the line rotation angle and the length of the ground wire cross pole are different. The results show that the single flashover ratio of rigid jumper can meet the requirement of 鈮，

本文編號：2176265