LXQII型(xing)消(xiao)諧(xie)(xie)(xie)器(qi)是安(an)裝在(zai)(zai)6～35kV中(zhong)(zhong)(zhong)(zhong)性(xing)(xing)點(dian)(dian)不(bu)接地(di)電(dian)(dian)(dian)(dian)網中(zhong)(zhong)(zhong)(zhong)的(de)(de)電(dian)(dian)(dian)(dian)磁(ci)式電(dian)(dian)(dian)(dian)壓(ya)(ya)互感器(qi)(以下(xia)簡稱PT)，壓(ya)(ya)變一(yi)(yi)次側(ce)中(zhong)(zhong)(zhong)(zhong)性(xing)(xing)點(dian)(dian)與地(di)之(zhi)間的(de)(de)高容量(liang)非線性(xing)(xing)電(dian)(dian)(dian)(dian)阻器(qi)，起(qi)阻尼與限流作(zuo)(zuo)用，可以有效(xiao)保護(hu)PT以及PT一(yi)(yi)次側(ce)的(de)(de)高壓(ya)(ya)熔絲。變電(dian)(dian)(dian)(dian)站中(zhong)(zhong)(zhong)(zhong)性(xing)(xing)點(dian)(dian)不(bu)接地(di)系統(tong)(tong)中(zhong)(zhong)(zhong)(zhong)，電(dian)(dian)(dian)(dian)壓(ya)(ya)互感器(qi)常因鐵(tie)(tie)(tie)磁(ci)諧(xie)(xie)(xie)振(zhen)(zhen)(zhen)(zhen)而燒毀或(huo)熔斷熔絲。人們對此做了(le)大量(liang)的(de)(de)分析(xi)研究，采取了(le)不(bu)少措(cuo)施防止諧(xie)(xie)(xie)振(zhen)(zhen)(zhen)(zhen)發(fa)生，然(ran)而由于系統(tong)(tong)結構的(de)(de)復(fu)雜性(xing)(xing)和運(yun)行方式的(de)(de)靈活，造(zao)成運(yun)行參(can)數具有隨機(ji)性(xing)(xing)。同時也因現存的(de)(de)各(ge)種消(xiao)諧(xie)(xie)(xie)措(cuo)施的(de)(de)局(ju)限性(xing)(xing)，使得只能(neng)在(zai)(zai)某些情(qing)況(kuang)下(xia)消(xiao)除諧(xie)(xie)(xie)振(zhen)(zhen)(zhen)(zhen)。電(dian)(dian)(dian)(dian)壓(ya)(ya)互感器(qi)飽和引起(qi)的(de)(de)鐵(tie)(tie)(tie)磁(ci)諧(xie)(xie)(xie)振(zhen)(zhen)(zhen)(zhen)仍然(ran)是威脅電(dian)(dian)(dian)(dian)力(li)系統(tong)(tong)安(an)全運(yun)行的(de)(de)重要原因。因此，有必(bi)要在(zai)(zai)分析(xi)中(zhong)(zhong)(zhong)(zhong)性(xing)(xing)點(dian)(dian)不(bu)接地(di)系統(tong)(tong)鐵(tie)(tie)(tie)磁(ci)諧(xie)(xie)(xie)振(zhen)(zhen)(zhen)(zhen)機(ji)理(li)的(de)(de)基(ji)礎上探討消(xiao)諧(xie)(xie)(xie)措(cuo)施，以便在(zai)(zai)實際工作(zuo)(zuo)中(zhong)(zhong)(zhong)(zhong)有針對性(xing)(xing)地(di)預防、消(xiao)除中(zhong)(zhong)(zhong)(zhong)性(xing)(xing)點(dian)(dian)不(bu)接地(di)系統(tong)(tong)鐵(tie)(tie)(tie)磁(ci)諧(xie)(xie)(xie)振(zhen)(zhen)(zhen)(zhen)。

6～35KV中性點不接地(di)電(dian)網中的(de)電(dian)磁式(shi)電(dian)壓(ya)互感器，當母線空載或出(chu)線較(jiao)少時(shi)，因(yin)合(he)閘充電(dian)或在運(yun)行時(shi)接地(di)故(gu)障消除(chu)等(deng)(deng)原因(yin)的(de)激發，會使電(dian)壓(ya)互感器過飽(bao)和，則可能產(chan)生鐵磁諧振過電(dian)壓(ya)。出(chu)現(xian)(xian)相對地(di)電(dian)壓(ya)不穩(wen)，接地(di)指示誤動作(zuo)，PT高(gao)壓(ya)保險絲熔(rong)斷等(deng)(deng)異常現(xian)(xian)象，嚴重(zhong)時(shi)會導致(zhi)PT燒毀，繼(ji)而引發其他事故(gu)。