1.產品概述
隨著(zhu)城市電(dian)(dian)(dian)網的(de)(de)(de)發(fa)展(zhan)，電(dian)(dian)(dian)纜(lan)線(xian)路(lu)(lu)的(de)(de)(de)比(bi)例逐年增多，導(dao)致對地(di)(di)(di)電(dian)(dian)(dian)容電(dian)(dian)(dian)流的(de)(de)(de)劇(ju)增。對于以(yi)(yi)電(dian)(dian)(dian)纜(lan)線(xian)路(lu)(lu)為主(zhu)的(de)(de)(de)配電(dian)(dian)(dian)網絡(luo)，如(ru)果采(cai)用(yong)以(yi)(yi)中性(xing)點不接(jie)地(di)(di)(di)方式或中性(xing)點經(jing)消弧線(xian)圈接(jie)地(di)(di)(di)方式運行，當發(fa)生(sheng)單相接(jie)地(di)(di)(di)故障時，會產生(sheng)數(shu)倍幅值很高的(de)(de)(de)過電(dian)(dian)(dian)壓，容易發(fa)展(zhan)成相間短路(lu)(lu)，使故障擴大，損壞電(dian)(dian)(dian)器(qi)設備，危(wei)害(hai)系統安全(quan)運行。如(ru)果采(cai)用(yong)中性(xing)點經(jing)小電(dian)(dian)(dian)阻(zu)接(jie)地(di)(di)(di)方式，則可以(yi)(yi)降低過電(dian)(dian)(dian)壓倍數(shu)到2.5倍以(yi)(yi)下，使其不會對電(dian)(dian)(dian)器(qi)設備造成危(wei)害(hai)，延長電(dian)(dian)(dian)器(qi)設備使用(yong)壽命，又(you)可以(yi)(yi)使繼電(dian)(dian)(dian)器(qi)保(bao)護設備可靠操作，有選擇(ze)地(di)(di)(di)快速(su)切(qie)除故障線(xian)路(lu)(lu)。
2.產品特點
LT-NRB系列變壓(ya)(ya)器中(zhong)性(xing)點(dian)接(jie)地(di)(di)電阻(zu)柜標準(zhun)設備由接(jie)地(di)(di)電阻(zu)元件、支(zhi)持絕緣(yuan)子、絕緣(yuan)套管、內部連線及柜體組成，適用(yong)于(yu)50/60Hz電壓(ya)(ya)等(deng)級(ji)為6～66kV輸(shu)配(pei)電系統(tong)，是用(yong)于(yu)連結變壓(ya)(ya)器中(zhong)性(xing)點(dian)與大地(di)(di)之間的(de)一(yi)種限流(liu)保護型電器。安(an)裝中(zhong)性(xing)點(dian)接(jie)地(di)(di)電阻(zu)柜后，當發生非金屬性(xing)接(jie)地(di)(di)時，流(liu)過接(jie)地(di)(di)點(dian)和(he)中(zhong)性(xing)點(dian)的(de)電流(liu)比金屬性(xing)接(jie)地(di)(di)時顯(xian)著(zhu)降(jiang)(jiang)低，非故障相電壓(ya)(ya)上升也顯(xian)著(zhu)降(jiang)(jiang)低，有限流(liu)降(jiang)(jiang)壓(ya)(ya)作用(yong)，避(bi)免了線路和(he)設備可能遭(zao)受的(de)破(po)壞(huai)。它通常用(yong)于(yu)短時工(gong)作制，不(bu)考(kao)慮(lv)長期通過大電流(liu)的(de)能力，它的(de)功率和(he)電壓(ya)(ya)等(deng)級(ji)視輸(shu)配(pei)電系統(tong)的(de)情況而(er)定。