What is YJV cable and how to lay YJV cable?

Cables are one of the necessary materials in power systems, usually composed of insulation, conductors and protective layers. YJV cable is also one of the cable types, mainly used in nuclear power plants, subways, tunnels, high-rise buildings and other places related to fire safety and fire rescue. So what is YJV wire and cable? What specifications and models do you have for YJV power cables? What are its laying methods and requirements? Next, learn about related knowledge with Jinshui Cable Group.

What kind of cable is yjv?

The yj in the YJV power cable means cross-linked polyethylene, v means polychloride, then YJV is a cross-linked polyethylene insulated PVC sheathed cable, the scope of use is for rated voltage (U0/U)0.6/1--- For 26/35kv power line transmission and distribution, the maximum rated temperature of the cable conductor is 90°C when in use, and the maximum temperature of the cable conductor is not more than 250°C when short-circuited (the longest duration does not exceed 5S). It is currently widely used in urban power grids, novel cables in mines and factories.

Structure of yjv cable

1. Wire core: The wire core of YJV is mainly copper core, and the application of aluminum core is less. It is the main conductive part of the power cable and is used to transmit electric energy;
2. Conductor insulation layer: PVC insulation material is used to isolate the conductor from the earth and conductors of different phases;
3. Filling layer: Fill the gap between the insulation and the conductor, and protect the wire core. The material is mostly soft nylon material.
4. Conductor shielding layer and insulating shielding layer: components of power cables of 15KV and above;
5. Steel tape armoring: the steel protective layer wrapped around the outer layer of the wire core to prevent the cable from being squeezed and deformed
6. Sheath layer: The armored YJV power cable is mostly used for underground burial, and its sheath layer is mostly made of polyethylene material, which plays the role of insulation and protection.

YJV Power Cable Technical Requirements

1. The rated temperature of the cable conductor is 90°C, and the temperature of the cable conductor does not exceed 250°C when short-circuited (the long duration does not exceed 5S).
2. The ambient temperature when laying cables should not be lower than 0°C
3. Allowable bending radius during laying: single-core cable is not less than 15 times the outer diameter of the cable; multi-core cable is not less than 10 times the outer diameter of the cable.

Type classification of YJV power cables

The cores of YJV cables mainly include single core, 2 cores, 3 cores, 4 cores, 3+1, 3+2 and other types. 3+1 means 3 phase wires and 1 ground wire. The classification of YJV cables can be divided into:
1KV and below are low-voltage cables;
1kv~10KV is medium voltage cable;
10KV~35KV is high voltage cable;
35~220KV UHV cables.
(We can customize related wires and cables according to customers' needs.)

Advantages and characteristics of YJV cables

1. XLPE insulated power cables have excellent mechanical properties, excellent electrical properties and chemical corrosion resistance.
2. Simple structure, light weight, no drop limit for laying.
3. The maximum rated working stability of XLPE insulated power cable conductors is 90 degrees Celsius, which is higher than that of PE insulated cables, so the current carrying capacity of XLPE insulated cables is further improved.

Laying method and precautions of yjv cable

Special tools should be used for cable laying, such as pay-off racks and other tools, to prevent mechanical damage during laying and keep away from the power supply. When the cable is laid through the pipe, the inner diameter of the pipe should not be less than 1.5 times the outer diameter.

1. YJV, YJLV copper (aluminum) core cross-linked polyethylene is laid indoors, in trenches and pipes, and can also be buried in loose, insulated PVC sheathed power cable soil, which cannot withstand external forces.
2. YJV22, YJLV22 copper (aluminum) core cross-linked polyethylene is laid underground, which can withstand mechanical external force, but cannot withstand the greater tensile force of vinyl insulated steel tape armored PVC sheathed power cables.

The above is the knowledge of YJV power cable products introduced by Zhengzhou Jinshui Cable and Wire Group. I hope it will help you in the process of using and purchasing. Zhengzhou Jinshui Cable Group has a mature sales team and experienced manufacturing department. We always adhere to the concept of serving you wholeheartedly. Welcome to consult more product content! ! !