The size of the cable is selected according to the power of the motor

For 240 copper core cables, you first calculate the rated current of the motor, and consider the cable cross-section according to the current, load temporary factor, and the on-site environment.

The three-phase 380-volt 200-kilowatt motor has a rated current of about 400 amps, which is almost "two amperes per kilowatt".

You can choose 3*185+1*95 copper core cable.

The laying method and the type of cable should also be considered.

The rated power of the motor is actually the mechanical power output by the motor shaft when the motor is executed at the rated voltage and rated current, which is less than the power calculated by the rated voltage and rated current due to the efficiency factor of the motor. The actual output power of the motor changes with the load, and the actual selection of the motor will select the motor with a slightly higher rated power than the required power, that is, the load capacity of the motor will leave a certain margin. As for the transmission parts of the device, of course, it is designed according to the needs of the transmission power, not the motor power, because the motor power itself is selected according to the needs.

The difference between the rated power and the output power of the motor is that the rated power is the work of the motor calibration, and the output power is the actual work done by the motor. The actual work can be much smaller than the rated power, or it can be larger than the rated power within a certain range. Swift Pure.

No, the maximum output power is usually higher than the rated power. The rated power can be understood as the highest power that can make the power supply work stably, but there is generally some potential to make the power supply overloaded, which is the maximum output power, but not for too long, otherwise it will burn out.

1. Output power "Nominal power" (nominal output power) is also called "nominal output power" (nominal output power). Output power"Explanation in academic literature: For other electrical appliances, the nominal power, also known as the nominal output power, refers to the maximum value of the output power that can work for a long time under the premise that the electrical appliance is not distorted.

Rated power. Loads are not set in stone.

When the load becomes larger, the rated power of the motor is still used.

Output power refers to the rated power or nameplate power or nominal power, and refers to the functional force or dragging mechanical capacity of the device. Input power = rated power efficiency.

The rated power is generally given the rated voltage and rated current, or it is marked on the electrical appliance.

The output power is the UI-i2R of the motor

I2R for thermal power

Hz is the alternating current frequency, which is 50Hz in China and 60Hz in some countries.

The rated 50W, the output 24W is not contradictory, and the rated is the value of the maximum energy load.

It is okay to be slightly larger or just right, and the power value of the motor nameplate refers to the output power value. The motor itself can also allow for a certain amount of overload, such as a motor with a service factor of yes.

Yes, all three are equal.

If it is a three-phase motor, the current per kilowatt is calculated as 2A, if it is a single motor per kilowatt current is calculated as 5A, the current carrying capacity per square meter of copper wire is theoretically 6A, and the actual should be 3A or 2A to ensure the safety factor (including the heat generated in the work).

For example, a motor with a power of 3000 watts:

If it is a three-phase motor, the current should be 2A, then the line selection should be the smallest square, the actual selection of 4 square lines is appropriate, preferably 6 square lines.

If it is a single motor, the current should be 15A, the line selection should not be less than 6 square lines, and the actual line should be 10 square lines.

3-phase low-voltage 200kw motor, line current i=p [(3)·u·cos]=200000 (, choose a copper core cable with a nominal cross-section of 185 or 240mm2, choose 185mm2 for a short connection distance, and choose a 240mm2 cable for a long distance.

BX1-500 welding machine 6 sets with a total capacity of 6x42=252kva, load rate 60%, 252x60%=, 6 welding machines are balanced and connected to the power supply when considering the line current i = q u = 151200 380 = 398a, choose a copper core cable with a nominal cross-section of 185 or 240mm 2, choose 185mm 2 for a short connection distance, and 240mm 2 for a longer distance.

200kw motor estimated rated current according to kilowatt 2 ampere is 400 amperes (three-phase 380 volt motor can be estimated in this way) cable selection "ten under five hundred on two" (search on the Internet yourself There are all) Considering factors such as start-up heat dissipation, it is recommended to choose a 240 square millimeter copper cable.

Roughly calculated at 380V voltage level, motor starting mode Y starts, motor running current 400A, cable allowance plus 30%, that is, cable current carrying capacity to 520A, buried, pipe 8 dismantling meter (520, ambient temperature 9 discount meter (650, 100 square meters of cable in addition to 2 times (. The calculation result is a square cable, the standard is not at this level, should be close to the standard cable cross-section of 400 square, the calculation result is the value of the use of aluminum core cable, copper core cable can take a lower level of cable cross-section of 300 square, refer to it,

You didn't tell the voltage level or the rated current can't be selected. Find out the rated current of the motor, and select it according to 2A per square millimeter when roughly calculated.

10kV high-voltage motor, power of 400kw, power cable specifications are selected.

According to I=P U, we can know that the rated current of the high-voltage motor is 40A, and the empirical formula knows that the cable of 1 square millimeter can be buried by the current of 2A, so the selection of more than 20 square millimeters of the cable with a truncated state surface is enough, but for the consideration of the fault current, we should choose a cable with a slightly larger cross-section, here, I recommend 50 square millimeters, whether it is overhead or buried, it can meet the requirements of use.

Hello dear! The selection principles of motor cables mainly include the following aspects:1

The conductor cross-sectional area of the cable must meet the requirements of the rated current of the motor, and the heat dissipation capacity of the cable should be considered. Generally speaking, the conductor cross-sectional area of the cable should be 10% or 20% larger than the fixed current of the motor. 2.

The insulation material of the cable should be able to withstand the rated voltage of the motor and have sufficient insulation strength and heat resistance. Common insulating materials are PVC, cross-linked polyethylene, rubber, etc. 3.

The shielding structure of the cable should be selected according to the use environment of the motor and the electromagnetic interference situation, such as armor shielding, copper tape shielding, copper wire braiding shielding, etc. 4.The length of the cable should be as short as possible to reduce the cable resistance and the voltage drop when the motor starts.

If the cable length is long, measures such as increasing the conductor cross-sectional area of the cable or using dual power supply should be used. 5.The installation of the cable should comply with the relevant standards and specifications to avoid the impact of mechanical damage, chemical corrosion, etc.

It should be noted that the choice of cable will be different for different types and power motors, and the specific situation of the motor needs to be carefully considered when choosing the cable.

Hello dear, I am glad to answer for you: the selection of motor cables needs to consider multiple factors, and the following are some common selection principles:1

Rated voltage and current of the cable: Choose the right cable according to the rated voltage and current of the motor to ensure that the cable can withstand the load of the motor. 2.

Cable material: According to the use environment of the cable (such as humidity, temperature, etc.), select the appropriate cable material to ensure that the cable can work normally in the use environment. 3.

Cable length: According to the distance between the motor and the power supply, select the appropriate length of the cable to ensure that the cable can be connected to the bright combustion motor and the power supply. 4.

Shielding of cables: If there is a strong magnetic field or interference signal in the environment where the motor is located, it is recommended to choose a shielded cable to reduce the interference and signal loss of the cable. 5.

Installation method: According to the installation method of the cable (such as buried, overhead, pipe penetration, laying, etc.), select the appropriate cable model and specification to ensure that the cable can be used safely and reliably. 6.

The quality of the cable: choose a reliable cable to ensure the quality and reliability of the cable, reduce the residual and low failure rate, and improve the service life. The above are some common principles for the selection of motor cables, but the specific selection also needs to be comprehensively considered according to the actual situation.

The motor power is 315kw, the voltage is 380v, and the distance is 100 meters, so a 300mm copper core cable should be selected.

From the formula of three-phase motor: p=

Therefore, the rated current of 315kW is i=p, COS is, and the voltage is 380V.

According to the current 594A, check the cable manual YJV, you need to use a 300mm copper core cable.