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超高壓交聯電纜應該選用哪種金屬護套
發布時間:2017-05-25 11:12:06來源:本站原創   點擊量:
超高壓交聯電纜應該選用哪種金屬護套

目前國內已有多條生產線能生產110KV及以上的超高壓交聯電纜,各廠的金屬套結構不全類同。不同金屬套各有其特征,用戶首先必需對金屬套的性能要有一個全面的認識和了解,按各自的條件進行選擇。仁者見仁、智者見智,本文對各種類型金屬套的性能和特征作個闡述。此文僅起一個拋磚引玉的作用,希各供電系統能介紹使用不同金屬套電纜的經驗,使制造部門了解用戶觀點與需求。
1.金屬套的種類
金屬套有二大功能:1隔水作用:防止XLPE絕緣接觸到水分發生水樹技,金屬套是電纜的徑向防水層;2能接受零序短路電流熱穩定性好。按生產工藝可分為三大類:擠包無縫金屬套、縱向焊縫金屬套和綜合護套等。采用的資料又有鉛、鋁、銅和不銹鋼等。金屬套的品種、制造、結構和特征如下:
金屬套品種制造和結構 特征
無縫鉛套 由連續壓鉛機擠包無縫連續鉛套
鉛的化學性能穩定,耐腐蝕。
無縫波紋鉛套由連續或非連續壓鋁機擠包鋁套及軋波紋電纜重量輕,鋁的化學性能較活潑,外護套損壞后鋁套易穿孔,外徑較大。
焊縫波紋鋁套鋁板卷包用焊機焊接后再軋同上,但有縱向焊縫。
焊縫波紋銅套銅板卷包用焊機焊接后再軋紋有縱向焊縫,外徑較大。
焊縫波紋不銹鋼不銹鋼板卷包用焊機焊接后再軋紋有縱向焊縫,熱穩定容量比波縱銅套低,外徑較大。
綜合護套鋁箔PE復合膜縱向搭蓋卷包熱風焊接電纜重量輕,鋁箔作防水層,用銅絲屏蔽滿足熱穩定。

以上6種金屬套都有良好的徑向防水層,但內在質量、應用特性和制造利息各不相同。目前國內除波紋銅套和不銹鋼套外都有生產。

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