通信电缆的电气技术指标多而高。一般金属电缆有导体电阻、绝缘电阻、工作电容、绝缘强度、不平衡电容等要求。对于长距离和同轴电缆,除了上述要求外,还有末端阻抗、阻抗不均匀性、衰减常数、串扰等要求。
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.
矿用电缆的发展现状:
1.低水平重复建设近年来,电线电缆行业对产品结构调整重视不够,产品结构矛盾依然突出,高水平产品不能满足需要。比如,从广义来看,中国裸线产量占近1/5,而发达国家只占1/10。在裸线中,架空线和普通钢芯铝绞线占绝大多数;
2.全行业亏损企业700多家,经济效益低下,亏损面超过1/4。行业销售收入的利税率1991年为11.7%,1995年降至5%。由于效益连年下滑,亏损企业增多,行业资金普遍紧张,平均资产负债率高达70%;
3.规模增长过快,电线电缆行业整体产能是需求的两倍多。2000年所有主要产品的预测需求量都小于生产能力。
矿用电缆的使用特点:
1.额定工频电压U0/U为380/660V、660/1140V、1.9/3.3kv、3.6/6kv、6/10KV、8.7/10KV、300/500V;
2.电缆导体的最高允许工作温度:65℃90℃;
3.电缆允许的最低工作环境温度为-35℃;
4.电缆弯曲半径:不大于电缆外径的6倍。
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