改進成套設備(bei)的(de)功能(neng)，添加單相接地毛病就近檢(jian)測(ce)和(he)阻隔，關于中性點不接地和(he)經消(xiao)弧線圈接地毛病處理辦法(fa)也將(jiang)是(shi)一項重(zhong)大的(de)技能(neng)革新(xin)。提升配網單相接地毛病選線成功率、探(tan)索完善接地毛病阻隔技能(neng)。

現有(you)(you)接地(di)毛病選(xuan)線維護(hu)主要選(xuan)用(yong)中性點(dian)(dian)經(jing)小(xiao)電(dian)(dian)(dian)阻接地(di)辦法(fa)下的零序電(dian)(dian)(dian)流(liu)維護(hu)或中性點(dian)(dian)非有(you)(you)用(yong)接地(di)辦法(fa)下的小(xiao)電(dian)(dian)(dian)流(liu)接地(di)選(xuan)線維護(hu)，在面臨高(gao)阻、間(jian)歇性等毛病時(shi)，仍存在選(xuan)線準確(que)率(lv)差(cha)，無法(fa)有(you)(you)用(yong)阻隔毛病，存在巨(ju)大隱患。當高(gao)阻接地(di)到達1000歐姆(mu)以上時(shi)，設備動(dong)作牢靠率(lv)80%；設備動(dong)作后選(xuan)線準確(que)率(lv)90%。毛病檢測精度差(cha)開關拒動(dong)誤動(dong)率(lv)高(gao)，導致配(pei)電(dian)(dian)(dian)網牢靠性下降。

從配(pei)電網規劃規劃下手合理的(de)(de)(de)選(xuan)擇(ze)中性點接(jie)(jie)地(di)(di)(di)辦法，開展(zhan)高(gao)低壓開關柜成套設(she)備(bei)(bei)技能研(yan)究(jiu)，開展(zhan)小(xiao)電流(liu)(liu)接(jie)(jie)地(di)(di)(di)體系單(dan)相接(jie)(jie)地(di)(di)(di)毛(mao)病(bing)(bing)選(xuan)線(xian)(xian)(xian)辦法的(de)(de)(de)研(yan)究(jiu)，進一(yi)步(bu)提(ti)高(gao)單(dan)相接(jie)(jie)地(di)(di)(di)毛(mao)病(bing)(bing)選(xuan)線(xian)(xian)(xian)的(de)(de)(de)準確率。選(xuan)用小(xiao)電流(liu)(liu)接(jie)(jie)地(di)(di)(di)體系的(de)(de)(de)區(qu)域要裝(zhuang)備(bei)(bei)接(jie)(jie)地(di)(di)(di)毛(mao)病(bing)(bing)線(xian)(xian)(xian)段(duan)判(pan)別與阻隔(ge)設(she)備(bei)(bei)。國家(jia)電網正在修訂(ding)的(de)(de)(de)《配(pei)電網技能導則(ze)》規則(ze)變電站要安(an)裝(zhuang)牢靠的(de)(de)(de)選(xuan)線(xian)(xian)(xian)設(she)備(bei)(bei)，在10s內切除的(de)(de)(de)接(jie)(jie)地(di)(di)(di)毛(mao)病(bing)(bing)。在小(xiao)電流(liu)(liu)接(jie)(jie)地(di)(di)(di)配(pei)電網中，消弧線(xian)(xian)(xian)圈將接(jie)(jie)地(di)(di)(di)電流(liu)(liu)降(jiang)至只有(you)幾個安(an)培(pei)，盡管有(you)利于熄弧，但也使(shi)毛(mao)病(bing)(bing)線(xian)(xian)(xian)路(lu)(lu)的(de)(de)(de)工(gong)頻(pin)零(ling)序(xu)電流(liu)(liu)往(wang)(wang)往(wang)(wang)小(xiao)于非毛(mao)病(bing)(bing)線(xian)(xian)(xian)路(lu)(lu)的(de)(de)(de)電流(liu)(liu)并且二者的(de)(de)(de)相位也根本相同，毛(mao)病(bing)(bing)線(xian)(xian)(xian)路(lu)(lu)工(gong)頻(pin)零(ling)序(xu)電流(liu)(liu)沒有(you)了(le)差異與非毛(mao)病(bing)(bing)線(xian)(xian)(xian)路(lu)(lu)的(de)(de)(de)特征(zheng)，這關于單(dan)相接(jie)(jie)地(di)(di)(di)毛(mao)病(bing)(bing)檢(jian)測來說正確選(xuan)線(xian)(xian)(xian)是困難的(de)(de)(de)。

10KV電(dian)(dian)(dian)力體(ti)系(xi)(xi)大多是小電(dian)(dian)(dian)流接(jie)(jie)地(di)(di)體(ti)系(xi)(xi)，當(dang)體(ti)系(xi)(xi)中產生單(dan)相(xiang)接(jie)(jie)地(di)(di)時，不會(hui)產生很大的(de)(de)短路(lu)電(dian)(dian)(dian)流。毛(mao)病(bing)(bing)(bing)點(dian)(dian)電(dian)(dian)(dian)弧(hu)經過消弧(hu)線圈補償感(gan)抗后(hou)能夠自行平(ping)息，熄弧(hu)后(hou)接(jie)(jie)地(di)(di)址(zhi)絕(jue)緣(yuan)可自行康復，能主動鏟除單(dan)相(xiang)接(jie)(jie)地(di)(di)毛(mao)病(bing)(bing)(bing)。如果間(jian)歇性弧(hu)光不能平(ping)息，長時間(jian)帶電(dian)(dian)(dian)運(yun)轉會(hui)造成(cheng)諧振過電(dian)(dian)(dian)壓(ya)，產生幾(ji)倍于正常的(de)(de)過電(dian)(dian)(dian)壓(ya)，過電(dian)(dian)(dian)壓(ya)將進一(yi)(yi)步(bu)使(shi)線路(lu)上的(de)(de)絕(jue)緣(yuan)層絕(jue)緣(yuan)子擊穿，造成(cheng)嚴峻的(de)(de)相(xiang)間(jian)短路(lu)事端。不管是哪種情況都須要對(dui)毛(mao)病(bing)(bing)(bing)點(dian)(dian)定位，隨后(hou)趕快組織維修(xiu)毛(mao)病(bing)(bing)(bing)點(dian)(dian)。單(dan)相(xiang)接(jie)(jie)地(di)(di)毛(mao)病(bing)(bing)(bing)產生后(hou)能維持運(yun)轉一(yi)(yi)定時間(jian)，因此大大提高了供(gong)電(dian)(dian)(dian)牢靠性。

配(pei)電開關的一二(er)次(ci)成套設(she)備(bei)的技能(neng)研發(fa)，是為了更好的標準配(pei)網主設(she)備(bei)，保障建造過(guo)程中一二(er)次(ci)同步建造投運，防止后期的改造，關于縮短施工期、提高牢靠性及運維功率(lv)、簡化投標流程等具有重(zhong)要(yao)意(yi)義。