改(gai)進成套設備的功能，添加單(dan)相接(jie)(jie)地毛病(bing)就近檢測和阻隔，關于(yu)中性(xing)點不接(jie)(jie)地和經消(xiao)弧(hu)線(xian)圈(quan)接(jie)(jie)地毛病(bing)處理辦法(fa)也(ye)將(jiang)是一項(xiang)重大的技能革新(xin)。提(ti)升配網單(dan)相接(jie)(jie)地毛病(bing)選(xuan)線(xian)成功率、探(tan)索完善接(jie)(jie)地毛病(bing)阻隔技能。

現有(you)接(jie)地(di)毛(mao)病選(xuan)線(xian)維(wei)護主要選(xuan)用(yong)中(zhong)(zhong)性點經(jing)小電阻(zu)接(jie)地(di)辦法(fa)(fa)下的零序電流(liu)維(wei)護或中(zhong)(zhong)性點非有(you)用(yong)接(jie)地(di)辦法(fa)(fa)下的小電流(liu)接(jie)地(di)選(xuan)線(xian)維(wei)護，在(zai)面臨高阻(zu)、間歇(xie)性等毛(mao)病時(shi)，仍(reng)存在(zai)選(xuan)線(xian)準確率差，無(wu)法(fa)(fa)有(you)用(yong)阻(zu)隔毛(mao)病，存在(zai)巨大(da)隱患。當高阻(zu)接(jie)地(di)到(dao)達1000歐姆以(yi)上時(shi)，設備動(dong)作牢靠率80%；設備動(dong)作后選(xuan)線(xian)準確率90%。毛(mao)病檢(jian)測精度差開關拒動(dong)誤(wu)動(dong)率高，導致(zhi)配電網(wang)牢靠性下降。

從配(pei)電(dian)(dian)(dian)(dian)(dian)網(wang)(wang)規(gui)劃規(gui)劃下(xia)手合理(li)的(de)選(xuan)(xuan)擇中性點接(jie)(jie)(jie)地(di)辦法，開展高(gao)低壓開關柜成套設備技(ji)能研究(jiu)，開展小(xiao)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)接(jie)(jie)(jie)地(di)體系單相接(jie)(jie)(jie)地(di)毛(mao)(mao)病(bing)(bing)選(xuan)(xuan)線(xian)(xian)辦法的(de)研究(jiu)，進一步(bu)提高(gao)單相接(jie)(jie)(jie)地(di)毛(mao)(mao)病(bing)(bing)選(xuan)(xuan)線(xian)(xian)的(de)準確(que)率。選(xuan)(xuan)用小(xiao)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)接(jie)(jie)(jie)地(di)體系的(de)區域要(yao)裝(zhuang)備接(jie)(jie)(jie)地(di)毛(mao)(mao)病(bing)(bing)線(xian)(xian)段判別(bie)與(yu)阻隔設備。國(guo)家(jia)電(dian)(dian)(dian)(dian)(dian)網(wang)(wang)正在修訂的(de)《配(pei)電(dian)(dian)(dian)(dian)(dian)網(wang)(wang)技(ji)能導則》規(gui)則變電(dian)(dian)(dian)(dian)(dian)站要(yao)安裝(zhuang)牢靠(kao)的(de)選(xuan)(xuan)線(xian)(xian)設備，在10s內切除的(de)接(jie)(jie)(jie)地(di)毛(mao)(mao)病(bing)(bing)。在小(xiao)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)接(jie)(jie)(jie)地(di)配(pei)電(dian)(dian)(dian)(dian)(dian)網(wang)(wang)中，消弧(hu)線(xian)(xian)圈將(jiang)接(jie)(jie)(jie)地(di)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)降至只有幾個安培(pei)，盡管有利于(yu)熄弧(hu)，但也使毛(mao)(mao)病(bing)(bing)線(xian)(xian)路的(de)工(gong)頻(pin)零(ling)序電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)往往小(xiao)于(yu)非毛(mao)(mao)病(bing)(bing)線(xian)(xian)路的(de)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)并且二者的(de)相位也根(gen)本相同(tong)，毛(mao)(mao)病(bing)(bing)線(xian)(xian)路工(gong)頻(pin)零(ling)序電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)沒有了差異(yi)與(yu)非毛(mao)(mao)病(bing)(bing)線(xian)(xian)路的(de)特征(zheng)，這關于(yu)單相接(jie)(jie)(jie)地(di)毛(mao)(mao)病(bing)(bing)檢測(ce)來說正確(que)選(xuan)(xuan)線(xian)(xian)是(shi)困難的(de)。

10KV電(dian)力體(ti)系(xi)大(da)(da)多是小(xiao)電(dian)流(liu)(liu)接(jie)(jie)地體(ti)系(xi)，當體(ti)系(xi)中產生(sheng)單(dan)相接(jie)(jie)地時，不會產生(sheng)很大(da)(da)的(de)短路(lu)電(dian)流(liu)(liu)。毛(mao)病(bing)點電(dian)弧經過(guo)(guo)消弧線圈補(bu)償感抗(kang)后(hou)能(neng)夠(gou)自行平(ping)息，熄弧后(hou)接(jie)(jie)地址絕(jue)(jue)緣(yuan)(yuan)可自行康復(fu)，能(neng)主動鏟除單(dan)相接(jie)(jie)地毛(mao)病(bing)。如果間歇性弧光不能(neng)平(ping)息，長時間帶電(dian)運轉會造(zao)成諧振過(guo)(guo)電(dian)壓，產生(sheng)幾倍于正常的(de)過(guo)(guo)電(dian)壓，過(guo)(guo)電(dian)壓將(jiang)進一(yi)步使線路(lu)上的(de)絕(jue)(jue)緣(yuan)(yuan)層絕(jue)(jue)緣(yuan)(yuan)子(zi)擊穿(chuan)，造(zao)成嚴(yan)峻的(de)相間短路(lu)事(shi)端(duan)。不管(guan)是哪種情況(kuang)都須要對(dui)毛(mao)病(bing)點定位，隨(sui)后(hou)趕快組織維修毛(mao)病(bing)點。單(dan)相接(jie)(jie)地毛(mao)病(bing)產生(sheng)后(hou)能(neng)維持(chi)運轉一(yi)定時間，因(yin)此大(da)(da)大(da)(da)提高了(le)供電(dian)牢靠性。

配(pei)電(dian)開(kai)關(guan)的一二次成套設備的技(ji)能研發，是為了更好的標(biao)(biao)準配(pei)網(wang)主設備，保障建造(zao)過程中一二次同步(bu)建造(zao)投運，防(fang)止(zhi)后期的改造(zao)，關(guan)于縮短施工期、提高牢靠性及運維功率、簡化投標(biao)(biao)流(liu)程等具有重(zhong)要意(yi)義。