一種快速解環(huán)保護(hù)及合解環(huán)方案

 

王彥國(guó)，余群兵，金震

（南京南瑞繼保電氣有限公司, 江蘇 南京 211102）

 

    摘 要：線路合環(huán)運(yùn)行時(shí)，當(dāng)相鄰線路發(fā)生故障，且保護(hù)或開關(guān)拒動(dòng)后，存在主變誤跳、擴(kuò)大失電范圍風(fēng)險(xiǎn)。對(duì)合環(huán)線路對(duì)繼電保護(hù)的影響進(jìn)行了分析，針對(duì)目前方案帶來(lái)的級(jí)差配合困難、設(shè)計(jì)回路改動(dòng)量大、降低保護(hù)可靠性等問(wèn)題提出了一種快速解環(huán)保護(hù)，避免失電范圍擴(kuò)大，并對(duì)某些配網(wǎng)的合環(huán)轉(zhuǎn)電操作，提出了一種備自投方案，實(shí)現(xiàn)合解環(huán)程序化操作，在倒閘失敗后自動(dòng)進(jìn)行反向合解環(huán)，確保重要負(fù)荷不失電。

    關(guān)鍵詞：合環(huán)線路；解環(huán)；繼電保護(hù)

    中圖分類號(hào)：TM773     文獻(xiàn)標(biāo)識(shí)碼：A     文章編號(hào)：1007-3175(2018)05-0046-05

 

    Abstract: When the line operating in loop closing mode and the adjacent lines happened to break down, the protection or switch refused to work, so that there were the main transformer breaking by mistake and the power loss range-enlarged risk. This paper analyzed the loop closing line impacts on the relay protection. Aiming at the difficulty of stage difference coordination caused by the existing scheme, the greatly changed design loop and the reduced protection reliability etc problems. This paper proposed a kind of fast unlink protection to avoid the power loss range-enlarged risk. A kind of spare power automatic switching scheme was proposed for the loop closing turning electricity operation of some distribution networks to realize the operation of loop closing line routinization operation. After the back brake broke down, the reverse loop closing started atomically to ensure the important load without losing power.

    Key words: loop closing line; unlink; relay protection