超低頻(pin)絕緣耐壓(ya)試(shi)(shi)(shi)驗(yan)(yan)(yan)實(shi)(shi)際上(shang)是(shi)工頻(pin)耐壓(ya)試(shi)(shi)(shi)驗(yan)(yan)(yan)的(de)一(yi)(yi)種替代(dai)方(fang)法。我們(men)知道，在對大(da)(da)型發電(dian)(dian)機、電(dian)(dian)纜等試(shi)(shi)(shi)品進行(xing)工頻(pin)耐壓(ya)試(shi)(shi)(shi)驗(yan)(yan)(yan)時，由于它們(men)的(de)絕緣層呈現較(jiao)大(da)(da)的(de)電(dian)(dian)容量(liang)(liang)，所以需(xu)要(yao)很大(da)(da)容量(liang)(liang)的(de)試(shi)(shi)(shi)驗(yan)(yan)(yan)變壓(ya)器(qi)或(huo)諧振變壓(ya)器(qi)。這(zhe)樣一(yi)(yi)些(xie)巨大(da)(da)的(de)設備，不但笨重，造價高，而且使用(yong)十(shi)分不便(bian)。為(wei)了解(jie)決這(zhe)一(yi)(yi)矛(mao)盾(dun)，電(dian)(dian)力(li)部門采用(yong)了降低試(shi)(shi)(shi)驗(yan)(yan)(yan)頻(pin)率，從而降低了試(shi)(shi)(shi)驗(yan)(yan)(yan)電(dian)(dian)源的(de)容量(liang)(liang)。從國(guo)內(nei)外多年的(de)理論和實(shi)(shi)踐證明，用(yong)0.1Hz超低頻(pin)耐壓(ya)試(shi)(shi)(shi)驗(yan)(yan)(yan)替代(dai)工頻(pin)耐壓(ya)試(shi)(shi)(shi)驗(yan)(yan)(yan)，不但能有同樣