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HZSB三相組合式過電壓保護器工頻放電電壓測試方法
【日期】 2013年9月29日   【瀏覽】 [1539]
HZSB三相組合式過電壓保護器工頻放電電壓測試方法
【作者/來自】網站管理員 【發表時間】2013-9-28 【點擊次數】995
工頻放電電壓試驗:試驗接線圖如下圖所示,圖中ZT為自耦調壓器,ST為升壓變壓器,試驗時在吸收器AB、AC、AD、BC、BD、CD兩端分別施加工頻電壓,調節自耦變壓器ZT,緩慢加壓,觀察安培表的電流變化,當安培表A的電流突然增大時,表明放電間隙放電,記錄此時電壓表V的電壓值,此值即為工頻放電電壓在變壓器原邊的數值,此值乘以升壓變壓器的變比,即為該兩相的工頻放電值。由于放電間隙允許有一定的分散度,以及測試方法的差異,現場測試值不應超出出廠試驗值20%。如果超出該范圍,請通知本公司處理。
注意事項:
1、試驗操作方法基本上同工頻耐壓試驗方法,但每兩次之間的時間間隔應不小于10秒。
2、試驗時應均勻、緩慢升壓,直至HZSB放電,放電后應馬上將電源回復到零。
3. 若LJ可調至動作值為1mA·nST(式中nST為升壓變壓器變比),則可省去HZSB專用檢測儀。
4. 對HZSB電壓等級為10KV及以下的,試驗時應將其放置鐵板上進行,鐵板必須可靠接地;電壓等級為10KV以上的,試驗時用絕緣子(絕緣子為隨箱裝入的附件)將HZSB支起并放在鐵板上,鐵板可靠接地后方可進行。鐵板面應略大于HZSB底座的底面。
5. 試驗時,應均勻升壓,從開始升壓至HZSB放電,時間控制在3.5~7S為宜。HZSB動作后應在0.2s內切斷電源。
6. 測量次數不少于3次,每兩次時間間隔應不小于10S,工放值取其平均值。工放值與上一次測試值的誤差在620%則視為合格,若因運輸或保管過程異常震動、雙方測試儀器和方法不同等原因造成HZSB參數變化超出上述范圍,則不得投入運行,這時應通知本公司協商處理。
7. 試驗時,只有間隙放電,其它任何部分不得發生閃絡。
8. 在對安裝有本保護器的開關柜作耐壓實驗時,必須將保護器的四只接線端頭全部拆除后方可進行。
9.該HZSB試驗周期為兩年一次。
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