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隨著國民經濟的不(bu)斷發展和電(dian)力系統的不(bu)斷完善，電(dian)力系統的安全運(yun)行及供電(dian)的可靠性顯得越(yue)(yue)來(lai)越(yue)(yue)重要。

傳(chuan)統觀(guan)念認(ren)為:3~35kV(含(han)66kV)電(dian)(dian)(dian)(dian)網屬于中(zhong)低壓的(de)(de)變壓配(pei)電(dian)(dian)(dian)(dian)網，此類(lei)(lei)電(dian)(dian)(dian)(dian)網中(zhong)的(de)(de)內(nei)部過(guo)電(dian)(dian)(dian)(dian)壓的(de)(de)值不(bu)(bu)高，所以危(wei)及(ji)電(dian)(dian)(dian)(dian)網絕(jue)緣安全水平的(de)(de)主要因素不(bu)(bu)是(shi)(shi)內(nei)部過(guo)電(dian)(dian)(dian)(dian)壓，而是(shi)(shi)大氣過(guo)電(dian)(dian)(dian)(dian)壓（即雷電(dian)(dian)(dian)(dian)過(guo)電(dian)(dian)(dian)(dian)壓），因而長期以來采取的(de)(de)過(guo)電(dian)(dian)(dian)(dian)壓保護措施僅(jin)是(shi)(shi)以防(fang)止大氣過(guo)電(dian)(dian)(dian)(dian)壓對設備的(de)(de)侵害(hai)。主要技術措施僅(jin)限于裝設各類(lei)(lei)避(bi)雷器，避(bi)雷器的(de)(de)放電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)壓為相電(dian)(dian)(dian)(dian)壓的(de)(de)4倍以上，按躲過(guo)內(nei)部過(guo)電(dian)(dian)(dian)(dian)壓設計，因而僅(jin)對保護雷電(dian)(dian)(dian)(dian)侵害(hai)有效，對于內(nei)部過(guo)電(dian)(dian)(dian)(dian)壓不(bu)(bu)起任何保護作(zuo)用。

然而，運行經驗證明，當這類(lei)電(dian)(dian)(dian)(dian)網發展到一定規模時，內部過電(dian)(dian)(dian)(dian)壓，特別是電(dian)(dian)(dian)(dian)網發生(sheng)(sheng)單(dan)相間歇(xie)性接(jie)(jie)地(di)時產生(sheng)(sheng)的接(jie)(jie)地(di)過電(dian)(dian)(dian)(dian)壓及特殊條件下產生(sheng)(sheng)的鐵磁諧(xie)振過電(dian)(dian)(dian)(dian)壓，已成為這類(lei)電(dian)(dian)(dian)(dian)網設備安全運行的一大(da)威脅，其中以單(dan)相間歇(xie)性接(jie)(jie)地(di)過電(dian)(dian)(dian)(dian)壓較(jiao)為嚴重。

近幾年來，經(jing)過(guo)(guo)冶(ye)金(jin)、煤炭(tan)、石(shi)油、化工及(ji)供(gong)電等企(qi)業的(de)(de)數百臺運行經(jing)驗表明，通過(guo)(guo)采用優能柜將過(guo)(guo)電壓較(jiao)大程度(du)的(de)(de)吸收(shou)，再(zai)配(pei)合選線及(ji)消諧模塊，在消除系(xi)統間(jian)歇(xie)性(xing)過(guo)(guo)電壓、鐵磁(ci)諧振過(guo)(guo)電壓、判斷(duan)單相接地(di)故障(zhang)線路等各(ge)方面，都(dou)收(shou)到了理想(xiang)的(de)(de)效果，受到用戶的(de)(de)歡迎和認可。