改進(jin)成(cheng)套設備的功能(neng)，添(tian)加單相接(jie)(jie)地毛病就近檢測和(he)阻隔，關于中性點不接(jie)(jie)地和(he)經(jing)消(xiao)弧線圈(quan)接(jie)(jie)地毛病處理辦法也(ye)將是一(yi)項重大的技能(neng)革新。提升配網單相接(jie)(jie)地毛病選線成(cheng)功率、探索完善接(jie)(jie)地毛病阻隔技能(neng)。

現有(you)接(jie)(jie)地(di)毛(mao)病選(xuan)線(xian)維護(hu)主(zhu)要選(xuan)用(yong)中(zhong)性點經小電阻(zu)接(jie)(jie)地(di)辦法(fa)下的零序電流維護(hu)或中(zhong)性點非有(you)用(yong)接(jie)(jie)地(di)辦法(fa)下的小電流接(jie)(jie)地(di)選(xuan)線(xian)維護(hu)，在(zai)面臨高(gao)阻(zu)、間(jian)歇(xie)性等毛(mao)病時，仍存(cun)在(zai)選(xuan)線(xian)準(zhun)確率(lv)(lv)(lv)差(cha)，無(wu)法(fa)有(you)用(yong)阻(zu)隔毛(mao)病，存(cun)在(zai)巨(ju)大隱患。當高(gao)阻(zu)接(jie)(jie)地(di)到達1000歐姆以上時，設備動(dong)作牢靠(kao)率(lv)(lv)(lv)80%；設備動(dong)作后(hou)選(xuan)線(xian)準(zhun)確率(lv)(lv)(lv)90%。毛(mao)病檢測(ce)精度差(cha)開關拒(ju)動(dong)誤動(dong)率(lv)(lv)(lv)高(gao)，導致配電網牢靠(kao)性下降(jiang)。

從配(pei)電(dian)(dian)(dian)網(wang)(wang)規劃規劃下手合理的(de)選擇中性點接(jie)地辦(ban)(ban)法，開展高低壓開關(guan)柜成套設(she)備(bei)(bei)(bei)技(ji)能(neng)研究，開展小(xiao)(xiao)電(dian)(dian)(dian)流(liu)接(jie)地體(ti)(ti)系單(dan)相(xiang)接(jie)地毛(mao)病(bing)選線(xian)(xian)(xian)辦(ban)(ban)法的(de)研究，進一(yi)步提高單(dan)相(xiang)接(jie)地毛(mao)病(bing)選線(xian)(xian)(xian)的(de)準確(que)率。選用小(xiao)(xiao)電(dian)(dian)(dian)流(liu)接(jie)地體(ti)(ti)系的(de)區域(yu)要裝備(bei)(bei)(bei)接(jie)地毛(mao)病(bing)線(xian)(xian)(xian)段判(pan)別(bie)與(yu)阻(zu)隔設(she)備(bei)(bei)(bei)。國(guo)家電(dian)(dian)(dian)網(wang)(wang)正(zheng)在修訂的(de)《配(pei)電(dian)(dian)(dian)網(wang)(wang)技(ji)能(neng)導(dao)則》規則變電(dian)(dian)(dian)站要安(an)裝牢靠的(de)選線(xian)(xian)(xian)設(she)備(bei)(bei)(bei)，在10s內切除(chu)的(de)接(jie)地毛(mao)病(bing)。在小(xiao)(xiao)電(dian)(dian)(dian)流(liu)接(jie)地配(pei)電(dian)(dian)(dian)網(wang)(wang)中，消弧線(xian)(xian)(xian)圈(quan)將接(jie)地電(dian)(dian)(dian)流(liu)降至只有幾個安(an)培(pei)，盡管(guan)有利于熄弧，但也使毛(mao)病(bing)線(xian)(xian)(xian)路(lu)的(de)工頻零(ling)序電(dian)(dian)(dian)流(liu)往往小(xiao)(xiao)于非(fei)毛(mao)病(bing)線(xian)(xian)(xian)路(lu)的(de)電(dian)(dian)(dian)流(liu)并且二(er)者的(de)相(xiang)位也根(gen)本相(xiang)同，毛(mao)病(bing)線(xian)(xian)(xian)路(lu)工頻零(ling)序電(dian)(dian)(dian)流(liu)沒有了差異(yi)與(yu)非(fei)毛(mao)病(bing)線(xian)(xian)(xian)路(lu)的(de)特征(zheng)，這關(guan)于單(dan)相(xiang)接(jie)地毛(mao)病(bing)檢測來(lai)說正(zheng)確(que)選線(xian)(xian)(xian)是困難的(de)。

10KV電(dian)力體系大多是小電(dian)流(liu)接地(di)體系，當體系中產(chan)(chan)生單相(xiang)接地(di)時(shi)，不會產(chan)(chan)生很(hen)大的短(duan)路(lu)電(dian)流(liu)。毛(mao)病(bing)(bing)(bing)(bing)點電(dian)弧(hu)經過(guo)消弧(hu)線圈補償感抗后(hou)能夠自(zi)行平息，熄弧(hu)后(hou)接地(di)址絕緣(yuan)可自(zi)行康復(fu)，能主動鏟(chan)除單相(xiang)接地(di)毛(mao)病(bing)(bing)(bing)(bing)。如果間(jian)歇(xie)性弧(hu)光不能平息，長時(shi)間(jian)帶(dai)電(dian)運(yun)轉(zhuan)會造(zao)成(cheng)(cheng)諧振過(guo)電(dian)壓(ya)，產(chan)(chan)生幾倍于正常的過(guo)電(dian)壓(ya)，過(guo)電(dian)壓(ya)將進一步(bu)使線路(lu)上的絕緣(yuan)層絕緣(yuan)子擊(ji)穿，造(zao)成(cheng)(cheng)嚴(yan)峻的相(xiang)間(jian)短(duan)路(lu)事端(duan)。不管是哪種情(qing)況都須要對毛(mao)病(bing)(bing)(bing)(bing)點定(ding)位(wei)，隨后(hou)趕快組織維(wei)修(xiu)毛(mao)病(bing)(bing)(bing)(bing)點。單相(xiang)接地(di)毛(mao)病(bing)(bing)(bing)(bing)產(chan)(chan)生后(hou)能維(wei)持運(yun)轉(zhuan)一定(ding)時(shi)間(jian)，因此大大提高了(le)供電(dian)牢(lao)靠性。

配(pei)電開關(guan)的(de)一二次成套設(she)備的(de)技能研發，是為了更好的(de)標準配(pei)網主設(she)備，保障建(jian)造(zao)過(guo)程中一二次同步(bu)建(jian)造(zao)投運(yun)，防(fang)止后期的(de)改造(zao)，關(guan)于縮短(duan)施工期、提(ti)高牢靠性及(ji)運(yun)維功率、簡化投標流程等具有重要(yao)意義(yi)。