Electricity consumption: 150 kilowatts, voltage 380 volts, what is the area of copper core wire?

It's a three-phase bus, right?

If it is used to connect resistive loads, that is, heating and the like, the current is much smaller, and it can be calculated according to the method mentioned in lar022.

However, if most of the three-phase power is inductive load, that is, the motor or the like, it should be pressed into the lower distribution bus:

Because of the good heat dissipation, a single wire needs 70 square wires. If the distance is more than 50 meters, it is best to change to 95 square meters.

If the ground cable is 95 square meters, if the distance is more than 50 meters, it is best to use 120 square meters.

My factory has just applied for 150kw of electricity in Shanghai, and the landlord can rest assured of these data, and can find an electrician, cable factory or power supply department to verify. (The power supply department gave me the lines are 120 square overhead single lines, and the margin is relatively large).

In addition, if there is a relatively large motor, such as a screw air compressor, the line to the equipment should be slightly thicker, otherwise due to the large starting current of the three-phase motor, it is easy to cause the wire diameter to be too small to start. My 22kw screw air compressor is more than 50 meters away from the electric room, and at first I used a 16 square wire, but it couldn't be started, and then I changed to a 25 square line to use it.

150000 380 3 phase = 132 (a).

It is recommended that the wire current density should not be more than 6 amperes square millimeter.

132 6 = 22 mm².

Therefore, copper wire with a cross-sectional area of not less than 22 square millimeters should be used.

By the formula of the three-phase motor: p=The rated current of 150kW is i=p ampere, and cos is. The voltage is 380V.

According to the current 283A, check the cable manual YJV knows, copper wire is required 70 square millimeters.

Safe ampacity.

Generally, the safe ampacity of copper conductor is determined according to the allowable maximum temperature of the core, cooling conditions and laying conditions. Generally, the safe current carrying capacity of copper wire is 5 8a mm, and the safe current carrying capacity of aluminum wire is 3 5a mm.

Key points》The safe ampacity of the general copper wire is 5 8a mm, and the safe current carrying capacity of the aluminum wire is 3 5a mm. Such as: the recommended value of the safe ampacities of mm bvv copper wires, and the recommended value of the safe ampacities of 4mm bvv copper wires 4 8A mm = 32A.

A load of 150kW at 380V requires a four-core copper cable of 67 032mm.

According to the formula for calculating the three-phase electric power:

p 3uicosa (cosa is the power factor, generally the value is 0 85);

The current carrying capacity of copper wire is generally 4A mm;

i 150000 (1 732 380 0 85) 268 127 (amps);

Cable conductor cross-sectional area 268 127 4 67 032 (mm).

The maximum is 95 square meters, and the best is 120 square meters.

The key is to inform other conditions such as; What electrical equipment? Voltage? Power supply distance?

What wire are you ready to choose? How are the wires laid? Thermal environment?

How long does electricity last? Wait, there is a certain relationship, the conditions are not enough, and it is fooling you to tell you!

In general, the power in this case can choose copper core wire, 95-185, uncertain.

Single-phase 150 kW three-phase 3*95+1*70 copper cable with positive travel three-phase specification. Single-phase voltage 220V equipment, with three-phase four-spike line power supply, guess the total power is 150kw, then three-phase balanced load, each phase power is 150 3=50kw. The current per phase is about 50000 220 = 227A.

Specification 3*95+1*70 copper cable in the air, the recommended ampacities are 271a. Meet the power supply needs of the equipment. Therefore, single-phase 150 kilowatts can be used with specifications of 3*95+1*70 copper.

Hello, the total power of 380V120 square copper wire can drive 70KW220V electrical appliances. The 120 square copper wire can carry up to 300A, 70 kW can be used if it is a single-phase 220V power supply, and 150 kW can be used for a three-phase four-wire power supply. At 220V voltage, the 120 square aluminum judgment shield core cable can withstand the current of 240A, and the copper core cable of 120 square meters can withstand the current of 300A at the maximum load power voltage, and the maximum load power is 66KW.

How to calculate the maximum load of 150 square copper cable with a voltage of 380 volts! Calculation formula.

The 150 square copper cable has a maximum capacity of 207 kilowatts. According to the formula, the safe current carrying capacity of a 150 square copper cable is equivalent to the safe current carrying capacity of a 185 square aluminum cable. The safe ampacity of a 185 square aluminum cable is 2 times that of its cross-section, i.e. 185x2 = 370a.

Therefore, the safe ampacities of 150 square copper cables are 370A. The corresponding power is: p = calculated with three-phase mains, and the power factor is taken.

The safe ampacity formula for aluminum cables is: 2.5 times nine, and go up minus one order. Thirty-five times 3.5, double in a group minus five.

The conditions have been changed and converted, and the high-temperature nine-fold copper has been upgraded. The number of pipe roots is two, three, four, eight, seven and six folds full of load current. The first sentence of the mantra means:

The current carrying capacity of aluminum-core insulated wires of various cross-sections and below squares is 9 times the number of cross-sections. If a square wire is squared, the current carrying capacity is . From 4 square Jing Naixian and above the multiple of the current carrying capacity and the number of cross-sections of the wire is to follow the wire number upwards, the multiple is subtracted by 1 one by one, that is, 4.

The second sentence of the formula means: the current carrying capacity of a wire of 35 square is a multiple of the number of cross-sections, that is, 35. From 50 square and above wire, the multiple relationship between its current carrying capacity and the number of cross-sections becomes two two wire numbers into a group, and the multiples are subtracted by 0 5 in turn, that is, the current carrying capacity of the square wire is 3 times the number of cross-sections, the current carrying capacity of the square wire is the multiple of its cross-sectional area, and so on.

The third sentence of the formula means: the conditions applicable to the formula are "aluminum core insulated wire, single open dressing, ambient temperature 25". If the aluminum core insulated wire is laid in an area where the ambient temperature is higher than 25 for a long time, the current carrying capacity of the wire can be calculated according to the above formula, and then it can be discounted.

When using not aluminum wire but copper core insulated wire, its current carrying capacity is slightly larger than that of aluminum wire of the same specification. For example, the current carrying capacity of 16 square copper wire can be calculated according to the current carrying capacity of 25 square aluminum wire. The fourth sentence of the mantra means:

In the case of two, three, or four wires through the pipe, the current carrying capacity is calculated as % of the current carrying capacity (single laying) in the bright beat formula.

First, the magnitude of the current is calculated according to the relationship between power, voltage, and current in electrical engineering. p = where: is the root number 3, is the power factor.

180kw = amps. Due to the large working current, it is not possible to connect the meter directly to the circuit, which is generally in front of the main switch on the incoming side.

Three-phase alternating current has many uses, and most of the AC electrical equipment in the industry, such as electric motors, use three-phase alternating current. In daily life, single-phase power supply, also known as lighting electricity, is mostly used.

When lighting electricity is used, one of the three phases of electricity is used to supply power to electrical equipment, such as household appliances, and the other wire is the fourth line of the three phase four wires, that is, the neutral line, which leads from the neutral point of the three-phase electricity.

With such a high power, it is almost 400 amperes when it is fully opened. The minimum is 185 square copper wire. It is best to use 240, because in practice, the temperature, heat dissipation method, etc. will have an impact on it.

The actual load of the wire should be about 60% of the marked value. Using a larger one can also save you a lot of trouble if you add equipment or something in the future.