通信電纜的電氣技術指標多而高。一般金屬電纜有導體電阻、絕緣電阻、工作電容、絕緣強度、不平衡電容等要求。對于長距離和同軸電纜,除了上述要求外,還有末端阻抗、阻抗不均勻性、衰減常數、串擾等要求。
Mine cable selection:
In mine power supply system, armored cables are generally used in high-voltage power supply lines, and the failure rate is much less than that used in low-voltage power supply. Power supply in mining area is a weak link in the power supply system, and the working environment is poor, so how to choose the type and section of cable is related to the safety of power supply operation. The following describes the selection method of cable type and cable section.
Mine cable is the abbreviation of coal mine cable, and all mine cables are flame retardant cables, and all of them should be issued with mine product safety mark certificates by Anbiao National Mine Product Safety Mark Center. U-type (M-type) rubber sheathed cable for coal mine.
礦用電纜的發展現狀:
1.低水平重復建設近年來,電線電纜行業對產品結構調整重視不夠,產品結構矛盾依然突出,高水平產品不能滿足需要。比如,從廣義來看,中國裸線產量占近1/5,而發達國家只占1/10。在裸線中,架空線和普通鋼芯鋁絞線占絕大多數;
2.全行業虧損企業700多家,經濟效益低下,虧損面超過1/4。行業銷售收入的利稅率1991年為11.7%,1995年降至5%。由于效益連年下滑,虧損企業增多,行業資金普遍緊張,平均資產負債率高達70%;
3.規模增長過快,電線電纜行業整體產能是需求的兩倍多。2000年所有主要產品的預測需求量都小于生產能力。
礦用電纜的使用特點:
1.額定工頻電壓U0/U為380/660V、660/1140V、1.9/3.3kv、3.6/6kv、6/10KV、8.7/10KV、300/500V;
2.電纜導體的最高允許工作溫度:65℃90℃;
3.電纜允許的最低工作環境溫度為-35℃;
4.電纜彎曲半徑:不大于電纜外徑的6倍。
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