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解決電力電纜熱伸縮的辦法

隨著負荷電流變化及環境溫度變化,電力電纜會發生熱伸縮,其中因線芯的熱脹冷縮而產生非常大的熱機械力,電纜線芯截面越大,所產生的熱機械力就越大;同時線芯和金屬護套還會因熱脹冷縮的多次循環,而產生蠕變。熱伸縮對電力電纜運行構成很大的威脅,會造成運行電纜位移、滑落,甚至損壞電纜及附件。那么我們有哪些解決辦法呢?


    (1)直埋敷設時,電纜因受到周邊土壤的限制,整根電纜無法產生位移,于是線芯將在熱機械力的作用下在線路的兩個末端產生很大的推力,引起末端位移,從而對電纜附件的安 全構成較大威脅。


    (2)徘管敷設時,電纜因不受到橫向約束,在熱機械力的作用下電纜將產生彎曲變形;電纜隨著電纜溫度的不斷變化,彎曲變形反復出現,使電纜金屬護套產生疲勞應變。


    (3)隧道敷設時,電纜一般均放在支架上,不作剛性固定,故電纜的熱伸縮較大,在斜面敷設時易出現滑落現象;在電纜的彎曲處易出現嚴重位移;電纜隨著電纜溫度的不斷變化,還會反復出現彎曲變形,使電纜金屬護套產生疲勞應變。


    (4)豎井敷設時,電纜的自重及熱機械力有可能使金屬護套產生過分的應變,從而縮短電纜的使用壽命。


    (5)市政橋梁敷設時,若電纜敷設在橋內排管中,則存在與排管敷設相同的問題;若電纜敷設在橋的箱梁中,則存在與隧道敷設相同的問題,除外敷設在橋梁上的電纜還會受到橋梁伸縮、振動的影響,從而加速電纜金屬護套的損壞。


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