What is YJV cables？
What is YJV cables？
YJV refers to XLPE insulated power cables. Among them, YJ means cross-linked polyethylene insulation, and V means polyvinyl chloride sheath. XLPE insulated power cables have good mechanical properties, electrical properties and chemical corrosion properties, so this type of wire and cable is mostly used in urban power grids, mines and other industries, but this type of wire and cable is not compressive, and everyone is running and storing Pay special attention when handling such wires and cables. Compared with ordinary wire and cable, the raw material cost of this type of wire is higher, and its price is also more expensive.
Yjv wires and cables have various specifications. For example, manufacturers can make them into combustion-supporting yjv wires and cables, fire-resistant yjv wires and cables, etc. according to user needs. We need to choose the appropriate model and safety voltage level wire products according to electrical applications. .
Classification of YJV cables
The classification according to the voltage level is not strictly divided, it is only classified according to the statement of the cable industry. According to the classification according to the voltage used, YJV cables can be divided into the following types.
For low-voltage cables of 1KV and below, the structure of low-voltage cables is relatively simple, usually consisting of a core, an insulating layer and a protective layer. But low-voltage cables also have single-core, double-core, three-core, four-core, etc.
1KV~10KV are medium voltage cables. The structure of medium voltage cables includes: conductor, conductor shielding layer, insulation and insulation shielding layer. Medium voltage cables are used in petrochemical, transportation, wastewater treatment, food processing and other fields.
10KV~35KV is a high-voltage cable. The components of a high-voltage cable from the inside to the outside include: conductor, insulation, inner sheath, filler (armoring), and outer insulation. Of course, armored high-voltage cables are mainly used for underground burial, which can resist high-intensity compression on the ground and prevent damage from other external forces. High voltage cables are mostly used in power transmission and distribution.
35~220KV is UHV cable. UHV cable is a kind of power cable that appears with the continuous development of cable technology. UHV cable is generally used as the central link belt in large-scale power transmission systems, and belongs to a high-voltage cable with high technical content. , mainly used for long-distance power transmission.
What are the advantages of YJV cables?
1. The identification marks of insulated wire cores are distinguished by color separation tape or masterbatch color separation.
2. The multi-core cable adopts a compact fan-shaped design, with stable structure, light weight and small outer diameter.
3. It has excellent electrical properties and high breakdown electric field strength.
4. Allow high working temperature, large carrying capacity, good heat resistance and aging resistance.
5. Cable laying and maintenance are simple and can withstand large external mechanical tension.
How to store and transport YJV cables?
During storage, the cable should be packaged in a standardized way to avoid long-term exposure to the sun in the open air. Both ends should be reliably sealed. The cable coil should be placed upright and should not be stored in a humid environment for a long time. The height of the tray should be considered during transportation and should be fixed effectively. During hoisting, several trays are not allowed to be hoisted at the same time, and it is strictly forbidden to push down from a high place.
Precautions for laying and installing cables
Special tools should be used for cable laying, such as pay-off racks, guide rollers, etc., to prevent mechanical damage during laying and keep away from heat sources.
When the cable is laid through the pipe, the inner diameter of the pipe shall not be less than 1.5 times the outer diameter of the cable. When multiple cables are passed through the pipe, it is forbidden to squeeze the cables. The total area of the cables shall not exceed 40% of the total area of the pipe.