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電纜知識大全,電纜人需要的知識精解
來源:www.wxdh18.com發布時間:2021年10月08日
1、電纜接頭和中間頭的設計應滿足哪些要求?應滿足的要求有:

  (1)耐壓強度高,導體連接好;

  (2)機械強度大,介質損失小;

  (3)結構簡單,密封性強。

2、電力電纜的內屏蔽層與外屏蔽層各在什么部位?采用什么材料?有何作用?

  為了使絕緣層和電纜導體有較好的接觸,去除導體表面的不光滑引起的導體表面電場強度的增加,一般在導體表面包有金屬化紙或半導體紙帶的內屏蔽層。為了使絕緣層和金屬護套有較好的接觸,一般在絕緣層外表面包有外層屏蔽層。外屏層與內屏層的材料相同,有時還外扎銅帶或編織銅絲帶。

3、選擇電力電纜的截面應從哪幾個方面考慮?應考慮如下幾個方面:

  (1)電纜長期允許通過的工作電流;

  (2)一旦短路時的熱穩定性;

  (3)線路上的電壓降不能超出允許工作范圍。


蘭州電線電纜


4、電纜在運輸裝卸過程中應注意什么?

  (1)在運輸裝卸過程中,不應使電纜及電纜盤受到損傷,嚴禁將電纜盤直接由車上推下,電纜般不應平放運輸,平放貯存。

  (2)運輸或滾動電纜盤前,須保證電纜盤牢固,電纜繞緊、充油電纜至壓力油箱間的油管應固定,不得損傷,壓力油箱應牢固,壓力指示應符合要求。

5、制作電纜頭時,對上下扳彎電纜芯線有何要求?

  扳彎線芯時,不得損傷紙絕緣,芯線的彎曲半徑不得小于電纜線芯的10倍。制作時要特別小心,應使線芯彎曲部分均勻受力,否則極易損傷絕緣紙。

6、簡述塑料電纜的熱收縮密封法。

  熱縮法適用于中、低壓橡、塑電纜接頭和終端頭的密封,也可適用于不滴流和黏性浸漬絕緣電纜。采用交聯聚乙烯型和硅橡膠型兩大類遇熱后能均勻收縮的熱收縮管。將這種管材套于預定的粘合密封部位,并在粘和部位涂上熱熔膠,當加熱到溫度后,熱縮管將收縮,同時熱熔膠熔化,待自然冷卻后即形成一道良好的密封封層。

7、用電動彎管機彎制電纜保護管時應注意什么?

  (1)彎管機應由了解其性能并熟悉操作知識的人員操作;

  (2)使用前須進行檢查,按鈕、操作把手、行程開關應完好,彎管機須可靠接地;

  (3)選用符合要求的模具,確定好所需要的彎曲半徑;

  (4)施工場地周圍,應有充足的活動范圍;

  (5)使用時待空轉正常后,方可帶負荷工作,運行中,嚴禁用手腳接觸其轉動部分;

  (6)工作完畢應及時停電,釋放油壓。
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