改進成(cheng)套(tao)設備的(de)功能，添加單(dan)(dan)相接(jie)地(di)毛(mao)病(bing)就近檢測和(he)阻隔，關于中性點不接(jie)地(di)和(he)經消弧線圈接(jie)地(di)毛(mao)病(bing)處(chu)理辦法也將是一(yi)項重大的(de)技(ji)能革新。提升配網單(dan)(dan)相接(jie)地(di)毛(mao)病(bing)選線成(cheng)功率、探索完善(shan)接(jie)地(di)毛(mao)病(bing)阻隔技(ji)能。

現有(you)(you)接地(di)(di)(di)毛(mao)(mao)病選線維(wei)(wei)護(hu)(hu)主要選用(yong)(yong)中性(xing)點經(jing)小電(dian)(dian)阻(zu)(zu)接地(di)(di)(di)辦(ban)法下的零(ling)序(xu)電(dian)(dian)流維(wei)(wei)護(hu)(hu)或中性(xing)點非有(you)(you)用(yong)(yong)接地(di)(di)(di)辦(ban)法下的小電(dian)(dian)流接地(di)(di)(di)選線維(wei)(wei)護(hu)(hu)，在面臨(lin)高(gao)(gao)阻(zu)(zu)、間歇性(xing)等毛(mao)(mao)病時，仍存在選線準確率差，無法有(you)(you)用(yong)(yong)阻(zu)(zu)隔毛(mao)(mao)病，存在巨大(da)隱患。當(dang)高(gao)(gao)阻(zu)(zu)接地(di)(di)(di)到達(da)1000歐姆以(yi)上時，設備動(dong)作牢靠率80%；設備動(dong)作后(hou)選線準確率90%。毛(mao)(mao)病檢測精(jing)度差開(kai)關拒動(dong)誤動(dong)率高(gao)(gao)，導(dao)致配電(dian)(dian)網牢靠性(xing)下降。

從配電(dian)(dian)網(wang)規劃(hua)規劃(hua)下(xia)手合理的選(xuan)擇(ze)中性點接(jie)(jie)(jie)地(di)(di)辦法，開(kai)展(zhan)高(gao)低(di)壓開(kai)關柜(ju)成套設(she)備(bei)(bei)技能(neng)研究，開(kai)展(zhan)小電(dian)(dian)流(liu)接(jie)(jie)(jie)地(di)(di)體(ti)系單相(xiang)(xiang)(xiang)接(jie)(jie)(jie)地(di)(di)毛病(bing)(bing)選(xuan)線(xian)辦法的研究，進一步提高(gao)單相(xiang)(xiang)(xiang)接(jie)(jie)(jie)地(di)(di)毛病(bing)(bing)選(xuan)線(xian)的準確率。選(xuan)用小電(dian)(dian)流(liu)接(jie)(jie)(jie)地(di)(di)體(ti)系的區域要(yao)裝備(bei)(bei)接(jie)(jie)(jie)地(di)(di)毛病(bing)(bing)線(xian)段(duan)判別與阻隔設(she)備(bei)(bei)。國家電(dian)(dian)網(wang)正(zheng)在(zai)修(xiu)訂的《配電(dian)(dian)網(wang)技能(neng)導則(ze)》規則(ze)變電(dian)(dian)站要(yao)安裝牢靠的選(xuan)線(xian)設(she)備(bei)(bei)，在(zai)10s內(nei)切(qie)除的接(jie)(jie)(jie)地(di)(di)毛病(bing)(bing)。在(zai)小電(dian)(dian)流(liu)接(jie)(jie)(jie)地(di)(di)配電(dian)(dian)網(wang)中，消弧線(xian)圈將接(jie)(jie)(jie)地(di)(di)電(dian)(dian)流(liu)降(jiang)至只有(you)(you)幾個安培(pei)，盡管有(you)(you)利于熄弧，但(dan)也使(shi)毛病(bing)(bing)線(xian)路的工(gong)頻零序電(dian)(dian)流(liu)往往小于非毛病(bing)(bing)線(xian)路的電(dian)(dian)流(liu)并且二(er)者的相(xiang)(xiang)(xiang)位也根本(ben)相(xiang)(xiang)(xiang)同，毛病(bing)(bing)線(xian)路工(gong)頻零序電(dian)(dian)流(liu)沒(mei)有(you)(you)了差(cha)異與非毛病(bing)(bing)線(xian)路的特征，這關于單相(xiang)(xiang)(xiang)接(jie)(jie)(jie)地(di)(di)毛病(bing)(bing)檢測(ce)來說正(zheng)確選(xuan)線(xian)是(shi)困難的。

10KV電力體系大(da)多(duo)是(shi)小電流接地(di)體系，當體系中產生(sheng)(sheng)單相(xiang)接地(di)時(shi)，不(bu)會(hui)產生(sheng)(sheng)很大(da)的短(duan)路電流。毛病點電弧經過(guo)消弧線圈補償感(gan)抗后(hou)能(neng)(neng)夠自行(xing)平息，熄(xi)弧后(hou)接地(di)址絕(jue)緣(yuan)可(ke)自行(xing)康復(fu)，能(neng)(neng)主(zhu)動鏟除單相(xiang)接地(di)毛病。如果(guo)間歇性弧光不(bu)能(neng)(neng)平息，長時(shi)間帶電運轉(zhuan)會(hui)造成諧振過(guo)電壓，產生(sheng)(sheng)幾(ji)倍于(yu)正(zheng)常的過(guo)電壓，過(guo)電壓將(jiang)進一步使線路上(shang)的絕(jue)緣(yuan)層(ceng)絕(jue)緣(yuan)子擊穿(chuan)，造成嚴(yan)峻的相(xiang)間短(duan)路事端。不(bu)管(guan)是(shi)哪種情況都(dou)須(xu)要對(dui)毛病點定位，隨后(hou)趕(gan)快組織維(wei)修毛病點。單相(xiang)接地(di)毛病產生(sheng)(sheng)后(hou)能(neng)(neng)維(wei)持運轉(zhuan)一定時(shi)間，因此(ci)大(da)大(da)提高(gao)了供電牢靠性。

配電開關(guan)(guan)的(de)一二次成套設備(bei)的(de)技能研發，是(shi)為(wei)了更好的(de)標(biao)準配網主設備(bei)，保障建造(zao)過(guo)程中一二次同(tong)步(bu)建造(zao)投運(yun)，防止后期的(de)改造(zao)，關(guan)(guan)于縮短施工期、提高牢(lao)靠性及運(yun)維功率、簡(jian)化投標(biao)流(liu)程等具有重要意(yi)義。