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High Voltage Copper/Aluminum Conductor XLPE Insulated PVC Sheath Power Cables up to 500kV

Jiangsu Dongfeng Cable Co.,Ltd(Originally Wuxi Dongfeng Factory )was founded in 1988,which is an high-tech private enterprise with collection of research,development and production of various wires and cables.The registered capital is 308 million RMB,total asset is 1810 million RMB.Factory area covers 160 thousand square meters,of which construction area is 120 thousand square meters.The corporation owns a Technology Center of Jiangsu Province Level.

In recent years,the enterprise was granted by government as High Technology Enterprise,Famous Enterprise of Jiangsu Province,Quality Faithful Enterprise,Advanced Enterprise of Wuxi City,Double Civilization Enterprise,AAA Class Credit Enterprise,Enterprise of Observing Contracts And Keeping Promise. Wires and cables of YUNFENG trademark scored many honors,such as Customer Satisfied Products In China,Famous Brand Products Of Jiangsu Province,Famous Brand Of China.The corporation is praised by customers in quality,service and reputation continually for many years,and it was awarded as Customer Satisfied Enterprise In Service And Integrity by China Consumer Protection Foundation,now it become one of important enterprise in wires and cables industry.

Main products of the corporation are :500Kv extra high voltage cable,220 and 110kV and 60kV high voltage power cable,XLPE insulated power cable for rated voltage from 1kV to 35kV,PVC insulated power cable,aerial insulation cable,aerial insulation cable,cables for electrical equipments ,low-smoke halogen-free flame retardant cable,fire proof cable,fire proof cable,general rubber cable,mineral cable,welding cable,control cable,AAC and ACSR,etc.

 

High Voltage and extra High Voltage, a speciality of the HV-team
Development, consultancy, planning and design, cost-optimization, production, logistics, installation and service. With this all-round support the DONGFENG cables HV-team will be at our customer's service in regard of the products high voltage and extra high voltage cables and accessories. Optimized internal communication systems, specialized divisions and intensively trained team members are the power behind the customer-orientated installation solutions. With competence and know-how the DONGFENG cables "Power Team" provides secure and reliable power supply wherever fully developed high-voltage power transmission is needed
The DONGFENG cables HV-team has gained overall international experience. As the HV-team feels bound to always deliver the optimal tailor-made system solutions, no two installations are alike. And while doing so, security and economy always come first.

The Cables
Design and manufacture
A wide variety of high voltage cable designs is offered by DONGFENG cables to provide most economic solutions. Various types of conductors, insulation, metallic screening and sheathing, corrosion protective layers etc. are available.

Conductors
The cable conductors can be made of copper or aluminium. The choice is a matter of the customer's preference or current carrying capacity. Large size solid conductors are made of aluminium.

Available conductor constructions:
(1)round solid conductors up to 2000 mm² (RE)
(2)circular stranded compacted conductors up to 1200 mm² (RM)
(3)circular conductors with shaped wires up to 2000 mm² (RM, Keystone conductors)
(4)segmental conductors up to 2500 mm² (RMS, Milliken conductors)
(5)oval-shaped stranded compacted conductors up to 800 mm² for external gas pressure cables (OM)
The conductors are manufactured to meet the requirements of the relevant national and international standards. For special applications, the conductors can be made watertight.

Insulation
The insulations for low-pressure oil-filled cables and for conventional pipe type cables are lapped from high quality insulating papers. Subsequently the paper insulated cable cores are impregnated in appropriate vessels with low viscous oil or high viscous compound.
For manufacture of XLPE insulated high voltage cables, DONGFENG cables disposes of four extrusion lines. Highest quality standards together with latest process control equipment and combined with decades of experience ensure manufacture of cables meeting the highest requirements and enabling development of most advanced power cable systems.

Water-blocking design
1. The conductor mostly uses a compact circular structure. For if copper conduct normal cross-section is in range of 800 mm2 and above, and the aluminium conductor in the range of 1000mm2 and above the structure should be Milliken conductor. We can achieve the conductor longitudinal water-blocking request.
2.  Products in all types and sizes have longitudinal water-blocking layers which are made up of semi-conductive water-proof cushion tape wrapped between the outer screen and radial water-blocking layer.
3. Aluminium-plastic sheath/swelling layer for vertical water resistant
4. Aluminium-plastic tape or corrugated aluminium sheath can be taken as a radial water-resistant layer, Corrugated aluminium sheath can be also taken as the metal screen sheath.
5. For laying in tunnel or duct, used in a damp environment or the place where the water level is comparatively high and able to bear moderate pressure

Metallic Covering
Conventional paper insulated cables require a pressure proof and watertight metallic enclosure, acting also as metallic screen. At DONGFENG cables both, extruded lead sheath as well as the aluminium sheath can be applied. These types of metal sheaths are, of course, also used on XLPE insulated cables. While the lead sheath leads to smaller dimensions, the aluminium sheath provides high short circuit current carrying capability and lower weight.
As the XLPE insulated cables do not require an internal overpressure, they are usually equipped with a copper wire screen. For radial moisture barrier a coated aluminium foil is longitudinally applied. The combination with the polyethylene oversheath is called aluminium polyethylene laminated (APL) sheath. This solution provides high short circuit capability and watertightness combined with lowest weight and smallest dimensions.
A combination of the copper wire screen with a metal sheath is also possible. For all XLPE insulated high voltage cables, the space between cable core and water barrier is made longitudinally watertight.

Oversheath
An extruded polyethylene sheath is provided as the standard solution. With respect to its excellent mechanical strength it is the optimum for buried cables. If required, a conductive layer can be provided on the outside. For special applications different
sheathing material may be used, optimized for the purpose.

Cabling and Armouring
For the conventional pipe type cables as well as for the City Cable, laying-up of the three cores and provision of the strong steel armour is an essential feature. Therefore, DONGFENG cables disposes also of the appropriate machinery to carry out these production Steps.

No. of cores (mm2)	Continuous current-carrying capacity (A)				Fault current carrying capacity for 1 second
	In air		In ground
	Solid bond	Solid bond	Solid bond	Solid bond	Cond. (kA)	Scr. (kA)
1x150	466	489	359	341	21.5	16.5
1x185	485	505	420	405	26.5	16.5
1x240	565	590	480	465	34.3	16.5
1x300	645	685	550	535	42.9	16.5
1x400	745	775	645	610	57.2	16.5
1x500	845	895	700	690	71.5	16.5
1x630	970	1020	790	780	90.1	16.5
1x800	1100	1165	880	870	114	16.5
1x1000	1280	1350	100	980	143	16.5
1x1200	1400	1480	1080	1055	172	16.5
1x1600	1644	1726	1177	1118	229	16.5
1x2000	1831	1922	1249	1186	286	16.5
1x2500	2428	2549	1447	1374	357.5	16.5