YJV2*70平方高压电缆 电力电缆出厂价6kV~35kV 中低压铜芯及铝芯交联聚乙烯绝缘电力电缆（YJV电缆，YJV22电缆，YJLV电缆，YJLV22电缆）XLPE
YJV2*70平方高压电缆 电力电缆出厂价
6kV~35kV 中低压铜芯及铝芯交联聚乙烯绝缘电力电缆（YJV电缆，YJV22电缆，YJLV电缆，YJLV22电缆）XLPE Insulated Power Cable
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A类系统──该类系统任何一相导体与地和接地导体接触时，能在1min内与系统分离
B类系统──该类系统仅包括单相接地故障短时运行的条件，接地故障时间应不超过1h, 但在任何情况下，Z长不超过8h每年接地故障总持续时间不超过125h；
C类系统──不属于A类、B类的系统。
System category A──This category comprises those systems in which any phase conductor that comes in contact with earth or an earth conductor. is disconnected from the system within 1 min.
System category B ──This category comprises those system which,under faultconditions,are operated,are operated for ashorttimewith one phase earthed.This period should not exceed 1 h..Fora longer period, not exceeding 8h on any occasion, can be tolerated.The total duration of earth faults in any year should not exceed 125h.
System categeory C──This category comprises all systems which do not fall into A and B
电缆的型号Type of cable
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型号 Type | 名称 Designation | 适用范围 Application | YJV | 铜芯交联聚乙烯绝缘氯乙烯护套电力电缆 Copper conductor,XLPE insulated and PVC sheathed power cable | 室内、隧道及电缆沟等场所，不能承受机械外力。单芯电缆不允许敷设在磁性管道中。 For laying indoors 、 intunnel or cable trench,unable to bear external mechan-icalforces.Single-core cable in magnetic duct is not permissible | YJLY | 铝芯交联聚乙烯绝缘乙烯护套电力电缆 Aluminium conductor, XLPE insulated and PVC sheathed power cable | YJY | 铜芯交联聚乙烯绝缘氯乙烯护套电力电缆 Copper conductor ,XLPE insulated and PEsheathed power cable | YJLY | 铝芯交联聚乙烯绝缘氯乙烯护套电力电缆 Alumimium conductor ,XLPE
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导体的概念：即是能够让电流顺利通过的金属载体材料。导体必须有良好的导电性能、物理机械性能、工艺性能和防腐性能。就导电性能来说，金属依次为银、铜、金、铝、镍、钢、合金。但是由于金属银的价格昂贵，所以我们在电缆当中多采用铜丝，一般在20℃铜的电阻率为 0.0175 Ω · mm2/m。我们为了保证导体能够充分的满足电缆应有的性能，在电缆导体中我们多选择无氧铜。氧的含量不大于0.03％，杂质总含量不大于0.05％，铜的纯度大于99.95％的铜就叫无氧铜 。无氧铜无氢脆现象，导电率高，加工性能、焊接性能、耐蚀性能和低温性能都非常的良好
YJV2*70平方高压电缆 电力电缆出厂价
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