YJV2*70平方高壓電纜 電力電纜出廠價6kV~35kV 中低壓銅芯及鋁芯交聯聚乙烯絕緣電力電纜（YJV電纜，YJV22電纜，YJLV電纜，YJLV22電纜）XLPE
YJV2*70平方高壓電纜 電力電纜出廠價
6kV~35kV 中低壓銅芯及鋁芯交聯聚乙烯絕緣電力電纜（YJV電纜，YJV22電纜，YJLV電纜，YJLV22電纜）XLPE Insulated Power Cable
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A類系統──該類系統任何一相導體與地和接地導體接觸時，能在1min內與系統分離
B類系統──該類系統僅包括單相接地故障短時運行的條件，接地故障時間應不超過1h, 但在任何情況下，Z長不超過8h每年接地故障總持續時間不超過125h；
C類系統──不屬于A類、B類的系統。
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
電纜的型號Type of cable
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型號 Type | 名稱 Designation | 適用范圍 Application | YJV | 銅芯交聯聚乙烯絕緣氯乙烯護套電力電纜 Copper conductor,XLPE insulated and PVC sheathed power cable | 室內、隧道及電纜溝等場所，不能承受機械外力。單芯電纜不允許敷設在磁性管道中。 For laying indoors 、 intunnel or cable trench,unable to bear external mechan-icalforces.Single-core cable in magnetic duct is not permissible | YJLY | 鋁芯交聯聚乙烯絕緣乙烯護套電力電纜 Aluminium conductor, XLPE insulated and PVC sheathed power cable | YJY | 銅芯交聯聚乙烯絕緣氯乙烯護套電力電纜 Copper conductor ,XLPE insulated and PEsheathed power cable | YJLY | 鋁芯交聯聚乙烯絕緣氯乙烯護套電力電纜 Alumimium conductor ,XLPE
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導體的概念：即是能夠讓電流順利通過的金屬載體材料。導體必須有良好的導電性能、物理機械性能、工藝性能和防腐性能。就導電性能來說，金屬依次為銀、銅、金、鋁、鎳、鋼、合金。但是由于金屬銀的價格昂貴，所以我們在電纜當中多采用銅絲，一般在20℃銅的電阻率為 0.0175 Ω · mm2/m。我們為了保證導體能夠充分的滿足電纜應有的性能，在電纜導體中我們多選擇無氧銅。氧的含量不大于0.03％，雜質總含量不大于0.05％，銅的純度大于99.95％的銅就叫無氧銅 。無氧銅無氫脆現象，導電率高，加工性能、焊接性能、耐蝕性能和低溫性能都非常的良好
YJV2*70平方高壓電纜 電力電纜出廠價
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