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如何選擇鋁合金電纜橋架工作地線

如何選擇鋁合金電纜橋架工作地線


  鋁合金電纜橋架系統工程設計時應地線與建筑結構、工藝以及有關專業密切配合,以確定最佳配置。設計內容應符合下列規定:

  1 系統設計應保證橋架能滿足工程所需敷設電纜的總量。并留有裕度。

  2 應正確選擇荷載等級。估算電纜重量時宜考慮預留裕度的重量;對施工、檢修的臨時附加集中荷載或其他需要考慮的特殊荷載(如風載、雪載,應按恰當組合一并計算。

    3 系統平面布置圖中應標出鋁合金橋架的路徑走向,托盤或梯架的規格、層數,各類彎通的位置,變寬、變高板及伸縮板的設置點,支吊架的配置及相關尺寸。

  4 系統剖面圖中應標出鋁合金橋架的層間間距、支吊架的層間標高、路徑走向的標高變動、支吊架的安裝方式等。

  5 應編制鋁合金橋架系統所需托盤、梯架直通、彎通、支吊架及主要附件的規格和數量的明細表,并注明其荷載等級和表面防腐處理等技術要求。


    如何選擇鋁合金電纜橋架工作地線, 這里中聯電纜為您分享其選擇原則:

    鋁合金橋架工作地線的選擇原則,是要確保測試相與其構成為一閉合回路,使本儀器能夠得到正確的測試波形。還應注意的是,工作地線必須和系統地連在一起,使人、儀器地、高壓設備地以及被測電纜的電纜橋架地四體同位。以確保人身安全和儀器設備完好。


    若電纜是相間故障,工作地線必須是其中一相線,且做地線的相線必須和系統地連在一起。對于無鉛套管的鋁合金橋架,在進行高壓閃絡測試時,絕大多數故障是對大地或空間放電。從理論上講,故障相對地或空間也形成一閉合回路,但實際上回路內的等效阻抗相當大,從而儀器上也就得不到正確的測試波形。在測試中如果遇到這種情況可采取對可疑故障點直接定點的方法來解決。無論什么地線,其接地點一定要可靠。

 


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