FDB 保護球隙測壓器

放電球隙的(de)應(ying)用：

在作(zuo)試(shi)(shi)驗(yan)(yan)(yan)(yan)時將球(qiu)隙(xi)(xi)器(qi)和(he)試(shi)(shi)品(pin)并聯，球(qiu)隙(xi)(xi)器(qi)本身串有每伏1歐的(de)保(bao)護電(dian)(dian)阻，先將球(qiu)隙(xi)(xi)調整在60%試(shi)(shi)驗(yan)(yan)(yan)(yan)電(dian)(dian)壓(ya)(ya)(球(qiu)隙(xi)(xi)的(de)放(fang)電(dian)(dian)距離(li)可以從下面球(qiu)間隙(xi)(xi)放(fang)電(dian)(dian)電(dian)(dian)壓(ya)(ya)表(biao)，表(biao)1、表(biao) 2中查得)，此時試(shi)(shi)品(pin)應同時接上(shang)。測定(ding)當球(qiu)隙(xi)(xi)放(fang)電(dian)(dian)時試(shi)(shi)驗(yan)(yan)(yan)(yan)變壓(ya)(ya)器(qi)和(he)低壓(ya)(ya)側電(dian)(dian)壓(ya)(ya)表(biao)讀數(shu)(取3~4次平均(jun)值(zhi))然后按(an)同樣方式(shi)測定(ding)70%和(he)80%試(shi)(shi)驗(yan)(yan)(yan)(yan)電(dian)(dian)壓(ya)(ya)時電(dian)(dian)壓(ya)(ya)表(biao) 讀數(shu)，以此三點線(xian)值(zhi)作(zuo)一曲(qu)線(xian)(大多為一直線(xian))，再延(yan)長此曲(qu)線(xian)(大多按(an)正比例推算(suan))至所需的(de)試(shi)(shi)驗(yan)(yan)(yan)(yan)電(dian)(dian)壓(ya)(ya)高10~15%位(wei)置上(shang)，作(zuo)為耐壓(ya)(ya)驗(yan)(yan)(yan)(yan)過(guo)程可能發(fa)生過(guo)電(dian)(dian)壓(ya)(ya)的(de) 放(fang)電(dian)(dian)保(bao)護。

使用球隙時，應以試(shi)驗時的氣溫和氣壓下修正(zheng)系數來修正(zheng)，可(ke)按下列(lie)公式計算：

V’2=SV2

S=0.3869/(273-t)

其(qi)中：S—相對空氣密(mi)度

      P—氣壓(毫米汞柱)

      t—氣(qi)溫(℃)

      V2—試驗狀態(tai)下(xia)的電(dian)壓

      V’2—標準狀態下的電壓(ya)(P=78毫米汞柱(zhu)、t=20℃)

           也即為放電曲線中(zhong)所求得電壓

FDB 保護球隙測壓器

注意事項：

高電壓絕緣試驗(yan)的(de)安全規則，必(bi)須按照國家1994-10-01實施GB311.6-83《高電壓試驗(yan)技術》第二部(bu)分(fen)“試驗(yan)程(cheng)序”和水(shui)電部(bu)《電氣設備預性驗(yan)規程(cheng)》為準(zhun)。