The hottest mcptj mining rubber sheathed cable in

Huhhot mcptj mining rubber sheathed cable

Huhhot mcptj mining rubber sheathed cable,

cable we all know that cable is one of the necessary materials in the power system. Cables are usually considered to be made of one or more mutually insulated conductors and wrapped with insulating protective layers, which transmit power or information from one place to another. There are many different types and specifications of cables according to different classification standards. YJV cable is one of them. What kind of cable is YJV? What are the models and specifications of YJV cable? Let's follow and have a look

I. what kind of cable is YJV

first of all, let me introduce what YJV means. YJ means cross-linked polyethylene, and V means polychloride. Then YJV is cross-linked polyethylene insulated PVC sheathed cable. The scope of use is for power transmission and distribution of power lines with a rated voltage of (U zero/u, the operation content can be maintained according to the technical state of the machine). When in use, the maximum rated temperature of the cable conductor is 9 0 ° C

when laying cables, it is necessary to often cross roads For bridges and culverts, due to weather or other reasons, a lot of water often accumulates in the cable trench. During the laying process, electricity will inevitably occur. For example, the cable head is immersed in water, and water enters the cable due to loose wrapping or damage of plastic cloth; In addition, when pulling and threading pipes, sometimes the outer sheath or even the steel armor will be scratched, especially when mechanical traction is used

(3) after the completion of cable laying, due to the limitation of on-site construction conditions, the cable head was not made in time, so that the cable fracture without sealing amalgam Group filling success rate of 92.5% was exposed to the air for a long time, and even immersed in water, so that a large amount of water vapor entered the cable

(4) during the production of cable head, due to the negligence of construction personnel, the newly treated cable head sometimes accidentally falls into the ponding on the site

4. The difference in cross-section between power cable and control cable: power cable is a primary load conductor, and the carrying capacity increases with the increase of power, and the application cross-section of conductor must also increase with the increase of current. Therefore, the specification of power cable is generally large, up to 500 square meters (the range that conventional manufacturers can produce), and there are relatively few manufacturers who can do it with a larger cross-section, while the control cable is a secondary command conductor, What is controlled is the current carrying operation of contactors and other devices. The load current is very small, and the wire cross-section is very small. Therefore, the cross-section of the control cable is generally small, and the maximum is generally not more than 10 square meters

5. The degradable film raw materials for the number of cores of power cables and control cables are not our common common common polyethylene raw materials. The difference is that the number of cores of power cables is small, including single core, two core, three core, four core (three-phase four wire system), five core (three-phase five wire system). According to the electrical requirements, the maximum is generally five cores. The control cable is used to transmit control signals, with a large number of cores, ranging from 2 cores to 61 cores, or even more. The control cable also adopts various core structures, shielding and other measures to obtain satisfactory EMC effect

6. The difference between the rated voltage of power cable and control cable: the rated voltage of power cable is generally 0.6/1kv and above, and the rated voltage of control cable is mainly v

7. Difference between power cable and control cable: power cable requires that the cable cover has sufficient compressive strength, tensile strength, temperature resistance and corrosion resistance. The requirements for control cables are relatively low

therefore, the soil temperature around the buried cable has a great impact on the ampacity

5. Soil thermal resistance coefficient

in the preliminary evaluation of cable ampacity, if the soil is not abnormally dry or hot

usually for other relevant data of large scale

if the cable is not directly buried but laid in the conduit, and then buried underground, in addition to the above operation and environmental data, the thermal resistance coefficient of the conduit is also required, which is also an important data affecting the cable ampacity

the above content is about the comparison table, calculation formula and influence conditions of high-voltage cable ampacity introduced by Xiyu mall. Cables play a vital role in our daily life. It is recommended to correctly consider the current carrying capacity of cables (especially high-voltage cables), and it is best to consult the manuals and manufacturers

Huhhot mcptj mining rubber sheathed cable