In 1879, the American inventor T.A. Edison wrapped jutes on the copper stick and put it into the iron pipe, and then filled as the asphalt mixture to make a cable.He laid the cable in New York and created an underground transmission.The following year, the British Karendi invented asphalts impregnated paper insulation power cable.Power cables are used to transmit and distribute power cables. Power cables are often used in urban underground power grids, power stations, and internal power supply inside industrial and mining enterprises and underwater transmission lines.
Power cable operation procedure
The power cable operating regulations mainly involve several aspects: for the stipulation of cable lines and basic requirements, the stipulation of cables directly in the underground, stipulated in the cable installation in the cable groove, the provisions of the cable laying in the exhaust tube, the installation of the cable installation of the cableOther requirements, cable reserve, technical requirements, cable line mechanical injury prevention, cable inspection of the above aspects.
Power cable load flow
In the traditional sense of the calculation method of cable load traffic, the parameters in the calculation method of cables use the recommended value in the standard values ??in ICE-60287.As the saying goes, the book is not as good as there is no book. The theory in the book is still very different from the actual.Therefore, the load capacity calculated through the parameter value is also deviated with the actual.At the same time, there are various layout methods for cables, such as: direct burial, cable ditch, tunnel, tube laying, etc.Different layout methods will directly or indirectly affect the operating, economical, and reliability of the cable.Therefore, it is really important to calculate the load capacity of accurate cables based on the reality. It will be essentially improved for the safe operation of cables, economical and practical, and utilization.
Specifications for power cable design
Directory: L Total 2 Term 3 Cable Type and Section Select 3.1 Cable Guardial Material 3.2 Electric Cable Core 3.3 Cable Insulation level 3.4 Cable Insulation Type 3.5 Cable Protection Type 3.6 Control Cable and Metal Shielded 3.7 Power Cable Guardian Section 4 Cable AnnexChoose and configure 4.1 General specification 4.2 Oil supply system of self -capacity oil supply cable 5 cable laying 5.1 General specification 5.2 Setting method 5.3 Underground buried laying 5.4 Lapture 5.5 Cable structure 5.6 Equipped in other public facilities.6 Cable support and fixed 6.1 general regulations 6.2 cable brackets and bridge 7 cable fire and prevent extension
Power Cable Specification Model
Low-voltage power cables, common basic models: VV ---- Polyvinyl chloride insulating polyvinyl chloride cover (copper core) power cable; YJV --- cross-linked polyethylene insulation polyvinyl chloride sheet (copper core) power cable.If it is (aluminum) conductor, add L in the middle, that is, VLV and YJLV; flame retardant cables, add ZR in front, that is, ZR-VV, ZR-YJV; fire-resistant cable, add N (or NH) to the front, That is, NH-VV, NH-YJV; halogen-free low smoke, model is WD-YJY, cross-linked polyethylene insulation polyolefin cover; the above function is integrated, including: WDZAN-YJY- (halogen-free low cigarette) cross-linkingPolyethylene insulation polyolefin condom, Class A flame retardant thermal power cable.Also: pre -divide cables, plus f (or yf); irradiating cross -linked cables, plus FZ; rubber cover cable, yq, yc (yqw, yzw, ycw), which correspond to light, medium, and heavy.There are many types, such as fire -prevention cables (mineral insulation cables), etc., generally not used on occasions.Specifications: The line diameter is 1.5, 2.5, 4, 6, 10, 16, 25, 35, 50, 70, 95, 15, 150, 185, 240, 300, etc.It is 3, 4, and 5 cores, of which 4 and 5 core divisions are divided into ranges, that is, the 4 cores, 5 cores correspond to 3+1, 4+1 or 3+2, no equal diameter cable n NLine and PE lines are based on national standards, such as 4*185+1*95 or 3*185+2*95.
Power cable price
The price of electric cables in different specifications, different types, and different materials is different.There are many types of electric cables that also make it different in terms of price.The production materials of the power cable head will also lead to different prices in terms of price.

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