微機消弧、消諧、選線、限壓保護柜

　　 我國國家標準規定，3~35KV（66KV）的電(dian)(dian)網(wang)(wang)為(wei)非直接(jie)接(jie)地(di)電(dian)(dian)網(wang)(wang)。此(ci)類電(dian)(dian)網(wang)(wang)發生單相接(jie)地(di)時，其余兩項的對地(di)電(dian)(dian)壓(ya)將升高至線(xian)電(dian)(dian)壓(ya)（UL），因此(ci)這類電(dian)(dian)網(wang)(wang)的各(ge)類電(dian)(dian)氣設(she)備，如變壓(ya)器、電(dian)(dian)壓(ya)/電(dian)(dian)流(liu)互(hu)感器、斷路(lu)器、線(xian)路(lu)等一次側對的對地(di)絕緣水平，都應滿足(zu)長(chang)期承受線(xian)電(dian)(dian)壓(ya)而不損壞(huai)的要求(qiu)。