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變壓器組配后的隔絕硬度復原舉措

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變壓器組配后的隔絕硬度復原舉措

發布日期:2017-08-12 作者:江蘇鶴都電器有限公司 點擊:

油處置在真空注油之前,用濾油機將油處置合格,并提交油的實驗報告。如有2種油混用,主張做混油實驗,實驗合格才干運用。油的通常功能剖析根據原有資料,現場可不再進行。但下列幾項目標有必要供給各油罐中油的實測數據:a.擊穿強度(規范空隙2.5mm)40kV(220kV級);b.油中水的體積分數1510-6(220kV級);c.介損tan0.5%(90)。
  真空注油a.寫入油的溫度主張操控在2070。注油速度取決于真空度的堅持,通常為36t/h.如真空度下降,
 應適當下降注油速度。b.注油時,真空泵持續運轉,通向油箱的閥門也堅持與抽真空時一樣,以便一切部件連同本體一同抽真空。運用真空濾油機真空注油時從油箱下部的注油閥進油,這樣油從線圈外向線圈內溢出,可削減油對線圈圍屏的張力。因為真空閥門和真空計設在油箱頂部蝶閥處,真空泵置于地面上,為避免將油抽入真空泵,當油位距油箱頂部約200300mm時,真空濾油機中止注油,但真空泵不中止抽真空,堅持真空時刻不少于4h.
  關于有載調壓
,當切換開關的油室和油箱之間有連通管時,為撤除連通管,當油注到挨近連通管時中止注油,距真空泵進口的高度仍應小于200300mm.此刻,免除真空,撤除連通管并加封板,再抽真空1h,然后持續用真空濾油機注油,直到油位挨近裝置氣體繼電器處的封板,全真空儲油柜油滿中止。在抽真空脫水脫氣技術之前,應裝置好真空注油油位指示器,以便在真空注油過程中,按上述需求操控油位。
  在變壓器器身處于高真空狀態下,用真空濾油機注油,意圖是對油進行結尾脫氣。如果在這種條件下油中依然存在氣體,比及油已浸沒變壓器器死后再抽真空排出油中氣體,作用就現已不大了。因而,應注重真空注油。
  補油a.真空注油技術需求盡量把油注滿,殘留空間盡可能小。直接用大氣免除真空時,僅在上層進入很少數的大氣,就可把對器身絕緣的不良影響約束到最低極限。因而可松開裝氣體繼電器處封板,直接用大氣免除真空。然后便可拆下封板,裝置氣體繼電器。
  b.封閉注油閥,拆下進油管,在非全真空儲油柜的進油管上裝置上油管。封閉儲油柜集氣室的排氣、排油閥門,翻開儲油柜頂部放氣塞子和進油閥門,用真空濾油機注油,向升高座和儲油柜等處補油。
  c.在向儲油柜補油時,要避免放氣塞被隔閡袋阻撓。如有阻撓,可用非金屬的圓頭棍棒從放氣塞孔中刺進,悄悄撥動隔閡袋。當放氣塞溢出油時,闡明儲油柜中膠囊以外的空氣已掃除潔凈,可將放氣塞旋緊,一起封閉進油閥,中止注油。
  變壓器現場裝置后,通過對油箱抽真空脫水脫氣、對絕緣油真空處置、真空注油、熱油循環等一系列辦法,能夠使其絕緣強計得到完全康復,實踐證明該辦法精確、有用,值得學習。

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