改進(jin)成套(tao)設備的功能(neng)，添加單相(xiang)接地(di)(di)(di)毛病(bing)(bing)就近檢測和阻(zu)隔，關(guan)于中(zhong)性(xing)點(dian)不接地(di)(di)(di)和經消弧線(xian)圈接地(di)(di)(di)毛病(bing)(bing)處理(li)辦法也將是(shi)一項重大的技能(neng)革新。提升配網單相(xiang)接地(di)(di)(di)毛病(bing)(bing)選線(xian)成功率、探索完善(shan)接地(di)(di)(di)毛病(bing)(bing)阻(zu)隔技能(neng)。

現有接(jie)地毛(mao)病選(xuan)(xuan)線維(wei)護(hu)主要選(xuan)(xuan)用(yong)中(zhong)(zhong)性(xing)點經小(xiao)電阻(zu)接(jie)地辦法(fa)(fa)下的零序電流維(wei)護(hu)或(huo)中(zhong)(zhong)性(xing)點非(fei)有用(yong)接(jie)地辦法(fa)(fa)下的小(xiao)電流接(jie)地選(xuan)(xuan)線維(wei)護(hu)，在面臨高阻(zu)、間歇性(xing)等毛(mao)病時(shi)，仍(reng)存在選(xuan)(xuan)線準(zhun)確率(lv)差，無法(fa)(fa)有用(yong)阻(zu)隔毛(mao)病，存在巨大隱患。當高阻(zu)接(jie)地到達1000歐(ou)姆以(yi)上時(shi)，設(she)備(bei)動作牢靠率(lv)80%；設(she)備(bei)動作后選(xuan)(xuan)線準(zhun)確率(lv)90%。毛(mao)病檢測(ce)精度(du)差開(kai)關拒動誤動率(lv)高，導致配(pei)電網牢靠性(xing)下降(jiang)。

從配(pei)電(dian)(dian)(dian)(dian)網(wang)規劃(hua)規劃(hua)下手合理的(de)(de)選(xuan)擇中性點接(jie)地(di)辦法，開(kai)展高低壓開(kai)關柜成套設備(bei)技(ji)能研究(jiu)，開(kai)展小(xiao)(xiao)電(dian)(dian)(dian)(dian)流(liu)(liu)接(jie)地(di)體系單相接(jie)地(di)毛(mao)(mao)(mao)病(bing)(bing)選(xuan)線(xian)(xian)(xian)辦法的(de)(de)研究(jiu)，進一步提高單相接(jie)地(di)毛(mao)(mao)(mao)病(bing)(bing)選(xuan)線(xian)(xian)(xian)的(de)(de)準確率。選(xuan)用(yong)小(xiao)(xiao)電(dian)(dian)(dian)(dian)流(liu)(liu)接(jie)地(di)體系的(de)(de)區域要(yao)裝備(bei)接(jie)地(di)毛(mao)(mao)(mao)病(bing)(bing)線(xian)(xian)(xian)段判(pan)別與(yu)阻隔設備(bei)。國家電(dian)(dian)(dian)(dian)網(wang)正(zheng)在(zai)修訂的(de)(de)《配(pei)電(dian)(dian)(dian)(dian)網(wang)技(ji)能導(dao)則(ze)》規則(ze)變電(dian)(dian)(dian)(dian)站要(yao)安裝牢(lao)靠的(de)(de)選(xuan)線(xian)(xian)(xian)設備(bei)，在(zai)10s內(nei)切除的(de)(de)接(jie)地(di)毛(mao)(mao)(mao)病(bing)(bing)。在(zai)小(xiao)(xiao)電(dian)(dian)(dian)(dian)流(liu)(liu)接(jie)地(di)配(pei)電(dian)(dian)(dian)(dian)網(wang)中，消弧線(xian)(xian)(xian)圈將接(jie)地(di)電(dian)(dian)(dian)(dian)流(liu)(liu)降至只有幾個安培，盡(jin)管(guan)有利于熄(xi)弧，但也使毛(mao)(mao)(mao)病(bing)(bing)線(xian)(xian)(xian)路的(de)(de)工頻零(ling)序電(dian)(dian)(dian)(dian)流(liu)(liu)往往小(xiao)(xiao)于非(fei)毛(mao)(mao)(mao)病(bing)(bing)線(xian)(xian)(xian)路的(de)(de)電(dian)(dian)(dian)(dian)流(liu)(liu)并且二者(zhe)的(de)(de)相位也根本相同，毛(mao)(mao)(mao)病(bing)(bing)線(xian)(xian)(xian)路工頻零(ling)序電(dian)(dian)(dian)(dian)流(liu)(liu)沒有了差異與(yu)非(fei)毛(mao)(mao)(mao)病(bing)(bing)線(xian)(xian)(xian)路的(de)(de)特(te)征，這關于單相接(jie)地(di)毛(mao)(mao)(mao)病(bing)(bing)檢測來說(shuo)正(zheng)確選(xuan)線(xian)(xian)(xian)是困難的(de)(de)。

10KV電(dian)(dian)(dian)(dian)(dian)力體(ti)(ti)系大多是(shi)小電(dian)(dian)(dian)(dian)(dian)流接(jie)地體(ti)(ti)系，當體(ti)(ti)系中產生(sheng)單相(xiang)(xiang)接(jie)地時，不會(hui)產生(sheng)很大的(de)(de)短(duan)路電(dian)(dian)(dian)(dian)(dian)流。毛(mao)病點(dian)電(dian)(dian)(dian)(dian)(dian)弧(hu)經過(guo)消弧(hu)線圈補(bu)償感(gan)抗后(hou)(hou)能夠自行平(ping)息(xi)，熄弧(hu)后(hou)(hou)接(jie)地址絕緣(yuan)可自行康復，能主(zhu)動鏟除(chu)單相(xiang)(xiang)接(jie)地毛(mao)病。如果間(jian)歇性弧(hu)光不能平(ping)息(xi)，長時間(jian)帶(dai)電(dian)(dian)(dian)(dian)(dian)運轉(zhuan)會(hui)造(zao)成諧振過(guo)電(dian)(dian)(dian)(dian)(dian)壓(ya)，產生(sheng)幾倍于正常的(de)(de)過(guo)電(dian)(dian)(dian)(dian)(dian)壓(ya)，過(guo)電(dian)(dian)(dian)(dian)(dian)壓(ya)將(jiang)進一步使線路上(shang)的(de)(de)絕緣(yuan)層絕緣(yuan)子擊(ji)穿，造(zao)成嚴峻的(de)(de)相(xiang)(xiang)間(jian)短(duan)路事端。不管是(shi)哪(na)種情況都須要(yao)對(dui)毛(mao)病點(dian)定(ding)位，隨后(hou)(hou)趕(gan)快組織維修毛(mao)病點(dian)。單相(xiang)(xiang)接(jie)地毛(mao)病產生(sheng)后(hou)(hou)能維持運轉(zhuan)一定(ding)時間(jian)，因此大大提高了供電(dian)(dian)(dian)(dian)(dian)牢靠性。

配電開關的(de)(de)一二(er)次成套設(she)備(bei)的(de)(de)技能研發，是為了更(geng)好的(de)(de)標準配網(wang)主設(she)備(bei)，保障建造過程中(zhong)一二(er)次同步建造投運(yun)，防止后期的(de)(de)改造，關于縮(suo)短(duan)施工期、提高牢(lao)靠(kao)性(xing)及運(yun)維功率、簡(jian)化投標流程等具有重(zhong)要(yao)意義。