改進成套(tao)設備(bei)的(de)功能(neng)，添加單(dan)相接地毛(mao)病(bing)就(jiu)近(jin)檢測(ce)和阻隔，關于中(zhong)性(xing)點不(bu)接地和經(jing)消弧(hu)線圈接地毛(mao)病(bing)處理辦法也將是一(yi)項重大的(de)技能(neng)革(ge)新。提升配網(wang)單(dan)相接地毛(mao)病(bing)選線成功率、探索完善接地毛(mao)病(bing)阻隔技能(neng)。

現有(you)接地毛(mao)病(bing)選(xuan)線維護主要選(xuan)用中性(xing)點經小電阻接地辦(ban)法下的零序(xu)電流(liu)維護或(huo)中性(xing)點非有(you)用接地辦(ban)法下的小電流(liu)接地選(xuan)線維護，在(zai)面臨高阻、間歇(xie)性(xing)等毛(mao)病(bing)時，仍存(cun)在(zai)選(xuan)線準確率(lv)(lv)差，無法有(you)用阻隔毛(mao)病(bing)，存(cun)在(zai)巨大(da)隱(yin)患。當高阻接地到達1000歐姆以上時，設備動作牢靠率(lv)(lv)80%；設備動作后選(xuan)線準確率(lv)(lv)90%。毛(mao)病(bing)檢測(ce)精度差開(kai)關拒(ju)動誤(wu)動率(lv)(lv)高，導(dao)致配電網牢靠性(xing)下降。

從配電(dian)(dian)(dian)(dian)網(wang)(wang)規劃規劃下手(shou)合(he)理的選擇中性點接地(di)(di)(di)(di)辦法(fa)，開展高(gao)低壓開關(guan)柜(ju)成(cheng)套設(she)備技(ji)能研(yan)究(jiu)(jiu)，開展小(xiao)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)接地(di)(di)(di)(di)體系(xi)單相(xiang)接地(di)(di)(di)(di)毛(mao)病(bing)選線辦法(fa)的研(yan)究(jiu)(jiu)，進一步提高(gao)單相(xiang)接地(di)(di)(di)(di)毛(mao)病(bing)選線的準確率。選用小(xiao)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)接地(di)(di)(di)(di)體系(xi)的區(qu)域要(yao)(yao)裝(zhuang)備接地(di)(di)(di)(di)毛(mao)病(bing)線段(duan)判別與(yu)阻隔設(she)備。國家(jia)電(dian)(dian)(dian)(dian)網(wang)(wang)正(zheng)在(zai)修訂的《配電(dian)(dian)(dian)(dian)網(wang)(wang)技(ji)能導則》規則變電(dian)(dian)(dian)(dian)站要(yao)(yao)安裝(zhuang)牢靠的選線設(she)備，在(zai)10s內(nei)切除的接地(di)(di)(di)(di)毛(mao)病(bing)。在(zai)小(xiao)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)接地(di)(di)(di)(di)配電(dian)(dian)(dian)(dian)網(wang)(wang)中，消弧線圈(quan)將接地(di)(di)(di)(di)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)降至只有幾個(ge)安培，盡管有利于(yu)(yu)熄(xi)弧，但也使毛(mao)病(bing)線路(lu)的工頻零序(xu)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)往往小(xiao)于(yu)(yu)非(fei)毛(mao)病(bing)線路(lu)的電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)并且二者的相(xiang)位也根本相(xiang)同(tong)，毛(mao)病(bing)線路(lu)工頻零序(xu)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)沒有了差異與(yu)非(fei)毛(mao)病(bing)線路(lu)的特征(zheng)，這關(guan)于(yu)(yu)單相(xiang)接地(di)(di)(di)(di)毛(mao)病(bing)檢測(ce)來(lai)說正(zheng)確選線是(shi)困難的。

10KV電(dian)(dian)力(li)體系大多是小電(dian)(dian)流接地(di)體系，當體系中產生(sheng)單(dan)相接地(di)時(shi)，不(bu)(bu)會產生(sheng)很大的(de)短路電(dian)(dian)流。毛(mao)(mao)病(bing)(bing)點電(dian)(dian)弧經過(guo)消弧線(xian)圈補償感(gan)抗后能(neng)夠(gou)自(zi)行(xing)平(ping)息(xi)，熄弧后接地(di)址(zhi)絕(jue)(jue)緣可自(zi)行(xing)康復(fu)，能(neng)主動鏟除(chu)單(dan)相接地(di)毛(mao)(mao)病(bing)(bing)。如果間(jian)(jian)歇性弧光(guang)不(bu)(bu)能(neng)平(ping)息(xi)，長(chang)時(shi)間(jian)(jian)帶電(dian)(dian)運(yun)轉會造成諧振過(guo)電(dian)(dian)壓，產生(sheng)幾倍于正常(chang)的(de)過(guo)電(dian)(dian)壓，過(guo)電(dian)(dian)壓將(jiang)進(jin)一步(bu)使線(xian)路上的(de)絕(jue)(jue)緣層絕(jue)(jue)緣子擊穿，造成嚴峻的(de)相間(jian)(jian)短路事端。不(bu)(bu)管(guan)是哪種情況都須要對毛(mao)(mao)病(bing)(bing)點定位，隨后趕快組(zu)織維修毛(mao)(mao)病(bing)(bing)點。單(dan)相接地(di)毛(mao)(mao)病(bing)(bing)產生(sheng)后能(neng)維持運(yun)轉一定時(shi)間(jian)(jian)，因此大大提高了供(gong)電(dian)(dian)牢靠性。

配電(dian)開關的(de)一二次(ci)成(cheng)套(tao)設備(bei)的(de)技(ji)能研發(fa)，是為了更好的(de)標準(zhun)配網主設備(bei)，保障建造過程中一二次(ci)同步建造投運，防止后期的(de)改造，關于縮(suo)短施工期、提(ti)高牢靠(kao)性(xing)及(ji)運維(wei)功率、簡化投標流程等具(ju)有(you)重(zhong)要意(yi)義。