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交聯聚乙烯絕緣電力電纜預防性試驗需要做哪些試驗項目

更新時間:2023-05-31  |  點擊率:675

交聯聚乙烯絕緣電力電纜預防性試驗需要做哪些試驗項目

交聯聚乙烯絕緣電力電纜預防性試驗需作如下試驗項目。
  1、電纜主絕緣絕緣電阻:用2500伏或5000伏兆歐表測量,讀取1分鐘以后的數據,對于三芯電纜,當測量一根芯的絕緣電阻時,應將其余二芯和電纜外皮一起接地。運行中的電纜要充分放電后測量,每次測量完都要采用絕緣工具進行放電,以防止電擊。絕緣電阻數值自行規定。試驗周期:重要電纜1年,一般電纜3年。
  2、電纜外護套絕緣電阻:就是測量鋼鎧對地的絕緣電阻值,它主要檢查支埋電纜的外護套有無破損。采用500伏兆歐表測量。當每千米的絕緣電阻低于0.5兆時,采用下面介紹方法判斷外護套是否進水。試驗周期:重要電纜1年,一般電纜3年。
  3、電纜內襯層絕緣電阻:就是測量銅屏蔽層對鋼鎧的絕緣電阻值,它主要檢查內襯層有無破損,采用500伏兆歐表測量。當每千米絕緣電阻低于0.5兆歐時,采用下面介紹方法判斷內襯層是否進水。試驗周期:重要電纜1年,一般電纜3年。


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