180 kW motor with how big cable

There are many types and specifications of wires and cables, and it is impossible to generalize. When choosing wires and cables, many factors should be considered, such as brand, category, specification, market, etc. Before choosing to buy, it is necessary to understand and compare in many aspects.

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1. Find the rated current of the 180kw motor (take three-phase 380v, power factor as an example) ieie=180kw (root number.

2. According to IE, check the table to find the cross-sectional area of the cable (taking the three-core + 1-core copper cable as an example for air laying) after investigation. The safe current carrying capacity of 3x95mm +1x50mm is 185A;

The safe current carrying capacity of 3x120mm +1x70mm is 210A;

The safe current carrying capacity of 3x150mm +1x70mm is 245A;

The safe ampacity of 3x185mm +1x95mm is 280A;

The safe current carrying capacity of 3x240mm +1x120mm is 335A.

From the consideration of cost saving, the best scheme is to use 3x95mm +1x50mm cable with 2 parallel connections, and the current carrying capacity = 185ax2 = 370a>ie

3. Conclusion. Three-phase 380V, 180KW motor can choose 2 x 3x95mm +1x50mm copper core cables.

Square cables are required. (1) Calculation method:

According to the formula i=p (u.

p-power(w); U-Voltage (380V); cos - power factor (; i-Phase current (a).

Bring in data p=,u=380v.

It is calculated that the phase current i=.

2) In a three-phase balanced circuit, the safe ampacity of the general copper wire is 5 8a mm2.

The most recent specification of the cable is:

Key points for cable purchase.

1. Look at the packaging, the wires of the national standard are often better, neat, and have a sense of quality when you hold them.

2. To open the package and take a look at the wires inside, the wire square requirements of the national standard are skin thickness (insulation thickness), too thick is non-standard, and the corresponding inner core is definitely not enough.

3. Burn it with fire and extinguish it within 5s after leaving, and it has a certain flame retardant function for the national standard line.

4. Look at the inner core, the higher the brightness of the inner core (copper), the better the copper, and the luminosity is uniform, shiny, and there is no sense of hierarchy. The national standard requires that the inner core must be made of oxygen-free copper. Non-standard such as black rod copper, there may be potential accidents.

In fact, not only the power line has its own corresponding color scale, yellow-green, red-blue and two-color yellow-green, but also the lighting line also has red-blue and two-color yellow-green mark.

Three-phase motor with load, from the stationary state to the normal speed of the process called the start process, the current of the motor starting process will reach 3 5 times of the normal operating current, so the cross-sectional area of the wire should consider the carrying capacity of this current, because the wire has a certain thermal stability capacity, the general wire selection is the times of the normal operation current.

As for the color scale of the wire, it is specified that phase A is yellow, phase B is green, phase C is red, and the grounding wire is yellow and green. As long as the ground wire is not connected incorrectly when the motor is wired, you don't have to care about how the three-phase color is connected, as long as the test start steering is good. If the test start turns in the opposite direction, you can arbitrarily swap two wires in the three-phase line.

The 380-volt three-phase motor is large or small. Some are 0/000 kilowatts. For such a small motor, if you use a square wire to connect, the binding post is too small to be connected at all. Therefore, how thick the line to use should be determined according to the actual situation.

In addition, as an aside, when choosing a linked computer, you should not only consider the current carrying capacity. There is also a mechanical strength to consider. For example, let's say a 380-volt three-phase 1,5k watt motor.

If you use copper cables, 1 square is enough. But mechanical strength should be taken into account. If the wiring of the motor can be connected, it is best to use a square cable.

The answer is usually not a theoretical algorithm, the actual consideration of 75kw running current is 150A, the current carrying capacity of copper core cable 3*50 is about 150A, the starting current is 7 times of the operating current for short-term starting, and 3*70---3*95 can be selected for long-term safe operation and efficiency-saving considerations.

If the distance is very close, you can use 35 square copper core cable, if the distance is far (more than 200 meters), you should still use 50 square instead.

Summary. Hello, dear. 75 kilowatt motor with 380 volts need to choose 90 square millimeters of aluminum core cable, or 70 square millimeters of copper core cable, if it is a national standard line, and the power supply distance is close, you can choose 50 square meters of copper core cable.

How big does a 380 volt cable do I need for a 75 kW motor?

Hello, dear. 75 kilowatt motor with 380 volts need to choose 90 square millimeters of aluminum core cable, or 70 square millimeters of copper core cable, if it is a national standard line, and the power supply distance is close, you can choose 50 square meters of copper core cable.

For the 75 kilowatt three-phase motor configuration cable, the rated current of the 75 kilowatt three-phase motor must first be calculated, and then selected according to the current carrying capacity of the wire.

First, calculate the rated current of the motor: the rated current per kilowatt power of 380V voltage is calculated as 2A. 75x2a=150a

Refer to the user manual of the cable, the corresponding aluminum wire cable is 70 square millimeters, and the corresponding copper core cable is 50 square millimeters.

There are various types and specifications of wires on the market, and smaller wires are flat and flat; Larger wires and cables have 120 square meters and 150 square meters. When you choose wires and cables, you often encounter problems that you don't know how much size model to choose.

So how big of a cable does a 90 kW leaky motor usually need?

1. A 90 kilowatt motor needs about 95 square millimeters of aluminum core wire, or 50 square millimeters of copper core wire.

2. The 90 kilowatt motor generally uses three-phase AC balance rotten electricity.

power supply, its rated voltage.

It is 380V, which can be calculated according to the formula, and the rated current.

It's about 180a.

3. Usually copper core wires are allowed to pass 4A current per square, and aluminum core wires are allowed to pass 2A currents per square, so theoretically, 90 kilowatt motors need about 45 square millimeters of copper core wires or 90 square millimeters of aluminum core wires.

Dear, you are happy to answer the question for you: How big cable does a 170 kilowatt motor and a 380 volt motor need? 380V170KW can choose a thick 35 square copper core cable or 40 square millimeters aluminum core cable.

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30 kW motors use aluminum wires of more than 16 square meters or copper wires of more than 10 square meters.

According to the formula for calculating the rated power of the three-phase motor: p=u i is the power factor of this motor, which is the efficiency of the motor, and the COS value of the domestic motor can be estimated in the actual estimation calculation, you and i are the phase voltage and phase current of the motor winding, respectively), and the rated current of the motor is about 57a.

Choose the formula: ten down, five hundred, two, five, three, five five, five five. Meaning:

Below 10 square meters shall be wired according to 5A per square meter, more than 100 square meters shall be wired according to 2A per square, more than 10 (exclusive) and less than 25 square meters shall be wired according to 3A per square meter, and more than 35 square meters (inclusive) and below 100 square meters (exclusive) shall be wired according to 4A per square meter.

Therefore, it is necessary to choose cables of more than 10 square meters.

1. Under normal circumstances, a motor with a 380V circuit power of 37kW needs to use more than 16 square aluminum wires and more than 10 square copper wires.

2. Current = 30000 380, take more than 16 square aluminum wires and more than 10 square copper wires.

3. If the three-phase is slightly unbalanced, the current of a certain phase may exceed 60A, and the cross-sectional area of the wire should be increased accordingly.

4. If allowed, star-delta starting conversion or soft start should be used, otherwise, the cross-sectional area of the wire should be increased accordingly.

The rated current of the 30 kilowatt motor is about 57A, and Wang Cheng uses 10mm2 copper core cable within 100 meters of Tanyou, 16mm2 for 100 150 meters, and 25mm2 copper core cable for 150 200 meters.

It depends on the choice of wire, at least the use of 95 square copper core cables of Hui Oak to sell the wire.

You can refer to the chart below to select the front suspicion: