文(wen)章(zhang)來源(yuan)：中國南(nan)方電網有(you)限(xian)責任公司(si) 發(fa)布時間：2018-05-19
5月11日，南方電(dian)網重點(dian)科技項(xiang)目(mu)“長翠村(cun)深(shen)井型(xing)(xing)接地極試驗(yan)項(xiang)目(mu)”在廣東河源連平縣開工建設，計(ji)劃10月底投產。這(zhe)是(shi)世界首例(li)深(shen)井型(xing)(xing)接地極，同時也是(shi)滇西(xi)北(bei)至廣東±800千伏特(te)高(gao)壓直(zhi)流(liu)工程關鍵(jian)節(jie)點(dian)。該項(xiang)目(mu)的(de)建設完成，將有利(li)于我國直(zhi)流(liu)輸(shu)電(dian)技術的(de)突(tu)破性(xing)發展。
直流(liu)輸電(dian)系統(tong)多采用(yong)(yong)雙極(ji)兩端中性點(dian)接(jie)(jie)地(di)方式建設，需要在(zai)送端和受端各建設一個(ge)直流(liu)接(jie)(jie)地(di)極(ji)。傳統(tong)的接(jie)(jie)地(di)極(ji)采用(yong)(yong)水平布(bu)置，占地(di)面積大(da)，選址、征(zheng)地(di)極(ji)其困難。為此，南(nan)方電(dian)網設立(li)重大(da)科技專(zhuan)項“直流(liu)輸電(dian)工(gong)(gong)(gong)程(cheng)深井接(jie)(jie)地(di)極(ji)技術(shu)(shu)及應(ying)用(yong)(yong)研(yan)究”，從深井型接(jie)(jie)地(di)極(ji)技術(shu)(shu)理論、關鍵技術(shu)(shu)參數(shu)、鉆井施工(gong)(gong)(gong)要求、電(dian)氣安裝工(gong)(gong)(gong)藝(yi)、石(shi)油焦炭回填等開展全方位的技術(shu)(shu)研(yan)究，并通過(guo)建設深井型接(jie)(jie)地(di)極(ji)工(gong)(gong)(gong)程(cheng)進行工(gong)(gong)(gong)業應(ying)用(yong)(yong)可(ke)行性試驗(yan)研(yan)究。相(xiang)比之下，該項新技術(shu)(shu)可(ke)以(yi)節省至少(shao)(shao)2/3占地(di)面積，節約投(tou)資(zi)、減少(shao)(shao)維護量(liang)。
該(gai)深(shen)(shen)(shen)井(jing)型(xing)接地(di)極(ji)(ji)主(zhu)體由三口1000米深(shen)(shen)(shen)井(jing)接地(di)極(ji)(ji)組成，呈正三角形布置，井(jing)間(jian)距100米；深(shen)(shen)(shen)井(jing)頂部(bu)開口直徑660毫米、底(di)部(bu)終孔直徑442.5毫米。通過工(gong)(gong)程驗證(zheng)，將形成深(shen)(shen)(shen)井(jing)接地(di)極(ji)(ji)工(gong)(gong)程應用的全(quan)套技術方案，并提供相關計算、設計軟件和工(gong)(gong)具，制定深(shen)(shen)(shen)井(jing)型(xing)接地(di)極(ji)(ji)技術規范，指(zhi)導后續直流(liu)工(gong)(gong)程的極(ji)(ji)址選址和建(jian)設。