通過穿心電容極間電容量的測試，可靈敏地反映穿心電容內部浸漬劑的絕緣狀況以及內部元件的連接狀況。若電容值升高，說明內部元件擊穿或受潮;若電容值減小，說明內部元件開路或缺油等。通過計算、分析(xi)電(dian)容(rong)(rong)值，可指導穿心電(dian)容(rong)(rong)的更(geng)換或檢修(xiu)工作。
穿(chuan)(chuan)心(xin)電(dian)容(rong)(rong)電(dian)容(rong)(rong)量(liang)(liang)的(de)改(gai)變(bian)將直接影(ying)響穿(chuan)(chuan)心(xin)電(dian)容(rong)(rong)的(de)通信質量(liang)(liang)，斷路(lu)器穿(chuan)(chuan)心(xin)電(dian)容(rong)(rong)電(dian)容(rong)(rong)量(liang)(liang)的(de)改(gai)變(bian)將影(ying)響斷口穿(chuan)(chuan)心(xin)電(dian)容(rong)(rong)的(de)均(jun)壓效(xiao)果，而高壓并聯穿(chuan)(chuan)心(xin)電(dian)容(rong)(rong)電(dian)容(rong)(rong)量(liang)(liang)的(de)改(gai)變(bian)影(ying)響補償(chang)效(xiao)果。電(dian)容(rong)(rong)量(liang)(liang)的(de)變(bian)化(hua)不僅影(ying)響穿(chuan)(chuan)心電(dian)(dian)(dian)容(rong)(rong)的(de)功能(neng)，更重要的(de)是(shi)改變了穿心電(dian)(dian)(dian)容(rong)(rong)內部電(dian)(dian)(dian)容(rong)(rong)芯子(zi)的(de)電(dian)(dian)(dian)壓分(fen)布和工作場強，加速了穿心電(dian)(dian)(dian)容(rong)(rong)的(de)老(lao)化(hua)，造成(cheng)絕(jue)緣事(shi)故。因(yin)此，穿心電(dian)(dian)(dian)容(rong)(rong)的(de)電(dian)(dian)(dian)容(rong)(rong)量是(shi)穿心電(dian)(dian)(dian)容(rong)(rong)的(de)一個重要指(zhi)標。
穿心(xin)電(dian)容(rong)及斷路器穿心(xin)電(dian)容(rong)
極間電容量測量
穿(chuan)心(xin)電(dian)(dian)容(rong)(rong)(rong)及斷路器(qi)穿(chuan)心(xin)電(dian)(dian)容(rong)(rong)(rong)極間電(dian)(dian)容(rong)(rong)(rong)量(liang)測量(liang)采(cai)用電(dian)(dian)橋法的(de)正接(jie)線方式(shi)，正接(jie)線橋體處(chu)于低壓屏蔽接(jie)地，對地寄生(sheng)電(dian)(dian)容(rong)(rong)(rong)影響小，測量(liang)準確，操(cao)作安全方便。測量(liang)時穿(chuan)心(xin)電(dian)(dian)容(rong)(rong)(rong)或(huo)斷路器(qi)穿(chuan)心(xin)電(dian)(dian)容(rong)(rong)(rong)高壓電(dian)(dian)極接高壓(ya)，低壓(ya)電(dian)極或小套管接電(dian)橋 Cx端，帶小套管的(de)穿心(xin)電(dian)容法蘭接地(di)。
測(ce)試(shi)前(qian)應對被試(shi)穿心電容(rong)充分放電并接(jie)(jie)(jie)地，拆除所(suo)有(you)接(jie)(jie)(jie)線(xian)，做好安全(quan)措施。合理(li)布置(zhi)(zhi)試(shi)驗(yan)設備，按(an)5-7 進行接(jie)(jie)(jie)線(xian)，嚴格按(an)照所(suo)使用測(ce)試(shi)儀器的操作(zuo)說明書進行設置(zhi)(zhi)和操作(zuo)。檢查(cha)測(ce)試(shi)接(jie)(jie)(jie)線(xian)和調壓器零位，檢查 Cx芯線(xian)和屏(ping)蔽是否(fou)相碰，注(zhu)意高壓引線(xian)對地距(ju)離，橋體是否(fou)靠譜接地。
取(qu)下接地(di)線(xian)，通(tong)知(zhi)其他人員遠離被試(shi)穿心電(dian)(dian)容，從(cong)零(ling)均勻(yun)升壓至測(ce)試(shi)電(dian)(dian)壓進行測(ce)試(shi)，測(ce)試(shi)電(dian)(dian)壓為 10kV。測(ce)試(shi)結束后應先將(jiang)高(gao)壓降(jiang)到零(ling)后再讀取(qu)測(ce)試(shi)數據，然后切斷電(dian)(dian)源(yuan)，對被試(shi)穿心電(dian)(dian)容放電(dian)(dian)接地(di)。
恢(hui)(hui)復穿(chuan)心(xin)電容(rong)接線(xian)，特別注意穿(chuan)心(xin)電容(rong)小套管接地引(yin)線(xian)的恢(hui)(hui)復。
