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隨著(zhu)國民(min)經(jing)濟的(de)(de)不斷發展和電(dian)力(li)系(xi)統(tong)的(de)(de)不斷完善，電(dian)力(li)系(xi)統(tong)的(de)(de)安全運行及供電(dian)的(de)(de)可靠(kao)性顯得越(yue)來越(yue)重要。

傳統觀念(nian)認為:3~35kV(含66kV)電(dian)(dian)(dian)(dian)網屬(shu)于(yu)中低(di)壓(ya)(ya)的變(bian)壓(ya)(ya)配電(dian)(dian)(dian)(dian)網，此類(lei)電(dian)(dian)(dian)(dian)網中的內部(bu)過(guo)(guo)電(dian)(dian)(dian)(dian)壓(ya)(ya)的值(zhi)不(bu)高，所以危(wei)及電(dian)(dian)(dian)(dian)網絕緣安全水平的主(zhu)要因(yin)素不(bu)是(shi)內部(bu)過(guo)(guo)電(dian)(dian)(dian)(dian)壓(ya)(ya)，而(er)是(shi)大(da)氣(qi)過(guo)(guo)電(dian)(dian)(dian)(dian)壓(ya)(ya)（即雷(lei)(lei)電(dian)(dian)(dian)(dian)過(guo)(guo)電(dian)(dian)(dian)(dian)壓(ya)(ya)），因(yin)而(er)長期以來采取的過(guo)(guo)電(dian)(dian)(dian)(dian)壓(ya)(ya)保護(hu)措(cuo)施僅是(shi)以防止大(da)氣(qi)過(guo)(guo)電(dian)(dian)(dian)(dian)壓(ya)(ya)對(dui)設(she)備的侵害。主(zhu)要技術措(cuo)施僅限于(yu)裝設(she)各類(lei)避雷(lei)(lei)器，避雷(lei)(lei)器的放(fang)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)壓(ya)(ya)為相(xiang)電(dian)(dian)(dian)(dian)壓(ya)(ya)的4倍以上，按(an)躲(duo)過(guo)(guo)內部(bu)過(guo)(guo)電(dian)(dian)(dian)(dian)壓(ya)(ya)設(she)計，因(yin)而(er)僅對(dui)保護(hu)雷(lei)(lei)電(dian)(dian)(dian)(dian)侵害有效，對(dui)于(yu)內部(bu)過(guo)(guo)電(dian)(dian)(dian)(dian)壓(ya)(ya)不(bu)起(qi)任(ren)何保護(hu)作用。

然而(er)，運行(xing)經驗證明，當這類(lei)(lei)電(dian)網發(fa)展(zhan)到一定(ding)規模時(shi)，內(nei)部過(guo)電(dian)壓，特別是電(dian)網發(fa)生單(dan)相間(jian)歇(xie)性接地(di)時(shi)產生的(de)接地(di)過(guo)電(dian)壓及特殊條件下產生的(de)鐵(tie)磁諧振(zhen)過(guo)電(dian)壓，已成為這類(lei)(lei)電(dian)網設備安(an)全運行(xing)的(de)一大(da)威脅，其中以(yi)單(dan)相間(jian)歇(xie)性接地(di)過(guo)電(dian)壓較為嚴重(zhong)。

近(jin)幾年來，經(jing)過(guo)冶(ye)金(jin)、煤炭、石(shi)油、化工及(ji)供(gong)電等(deng)企業的數百(bai)臺運行經(jing)驗(yan)表明，通(tong)過(guo)采用優能柜將過(guo)電壓(ya)較大(da)程度的吸(xi)收，再配合選線及(ji)消諧模塊(kuai)，在消除系統間歇性(xing)過(guo)電壓(ya)、鐵磁諧振過(guo)電壓(ya)、判斷單相(xiang)接地(di)故障線路等(deng)各(ge)方面，都(dou)收到了理想(xiang)的效果，受到用戶的歡(huan)迎和(he)認可。