Three phase 380V 150kw motor should be equipped with a large brake

Three-phase 380V 150kw motor rated current of about 300A, circuit breaker rated for the motor rated current times 400A-450A is appropriate.

The motor power is 150KW, and the rated voltage is 380V, and its rated current is obtained i=p u=150000 380=394A

You can choose a three-phase air switch around 400A-450A.

Open 600a. The protection is about 300, which can be fine-tuned according to the actual situation.

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If the 150kw three-phase motor is a 380V power supply, the running current is 300A, and a 400A leakage protector should be used.

With YJV-150 square cable, the core type is selected depending on their load type: the general electrical box distribution selection YJV-4 * 150 + 1 * 95, motor load: with YJV-3 * 150 + 2 * 95, the meter is equipped with a transformer 400 5, and the meter is the same as above.

Instrument transformer: instrument transformer, also known as instrument transformer, is a general term for equipment that converts voltage or current proportionally, current transformer and voltage transformer. Its function is mainly to convert high voltage or high current into standard low voltage (100V) or standard low current (5A or 1A, both refer to rated values) in proportion, so as to realize the standardization and miniaturization of measuring instruments, protection equipment and automatic control equipment.

At the same time, the transformer can also be used to isolate the high-voltage system to ensure the safety of people and equipment. A device that converts voltage or current proportionally. There are two main types of transformers: voltage transformers and current transformers.

380v150kw

The current is about 300A

95 square copper cable or 150 square aluminum cable is required.

There is no such a large meter, so you need to install a transformer:

With 300 5 current transformers, electricity meters.

You have a question of transmission wire diameter selection. The maximum line current of the load should be calculated first, and then the appropriate wire diameter should be selected according to the allowable safe current carrying capacity of the wire (cable). The formula for calculating the load power of the three-phase balanced load is:

p=。The line current formula can be deduced from the three-phase balanced load power formula: i=p.

where: p is the load power.

U is the line voltage, and the three-phase is 380V

COS is the load power factor, the general motor takes , and the fluorescent lamp takes the line current of your load:

i=p Because the starting current of the motor is 4 7 times of the rated working current, although the starting time is very short, for the safe operation of the circuit, it is still necessary to consider the starting current of the multiplier.

In the 380V circuit, 1KW is about 2A, which is about 11A. Copper core wire can load 5 to 8A per square millimeter, so copper wire is squared enough.

10 square aluminum core wire, or 6 square copper core wire.

Whether it's the size of the coil or the three-phase connecting wire.

There are rated voltage and power on the wires, you see. I guess I'll have to use three-phase copper wire.

150 kW 380V requires 110mm copper cable.

From the formula of three-phase motor: p=

So the rated current of 150kw i=p and cos is. The voltage is 380V.

According to the current 283A, check the cable manual YJV, you need to use a 110mm copper cable.

The selection of insulated wires should consider the following aspects:

1) The rated voltage of the wire should be higher than the working voltage of the device;

2) The auxiliary circuit usually adopts multi-strand copper core insulated flexible wire;

3) The cross-sectional area of the conductor should be selected to withstand the maximum allowable long-term working current in the circuit.

Table 2 (Table in Appendix A) applies to the connection of one copper wire on each terminal.

Rated current: Single-core or multi-conductor wire, flexible conductor.

Cross-sectional area Cross-sectional area.

Minimum, Max, Minimum, Max.

a mm2 mm2

Hello! The rated current of the 150kw 380v motor is about 300A, and the safe current of the 185 square copper cable is 185*

Therefore, 185 square will do.

Hope it helps!

Calculate the operating current.

i=150 power factor estimated).

304A, check the long-term allowable current carrying capacity of 150 square millimeters copper core cable in the air is 325A, this kind of cable can be selected.

The rated current of the 150kw 380v motor is about 300A, and the safety current of the 185 square copper cable is 185*, so 185 square can be used.

wires and cables; Wire and cable is a wire product that transmits electrical energy, electrical signals and realizes electromagnetic energy conversion. Cables usually consist of a core that transmits electricity or signals and a sheath that protects and insulates them. Cables that contain only one core and are thinner in diameter are often referred to as wires.

There are also wires that are not insulated and are called bare wires. The core in the cable is made of a metal material that conducts electricity well, usually using copper (which conducts well) or aluminum (which is less expensive).

Hello answer: Glad to answer for you. 150 kW with 70 square millimeters copper cable. The formula is made by the three-phase motor: p = power 150kw rated current i = p ampere, cos is. The voltage is 380V.

Hope it helps. Have a great day!

According to the calculation of the third edition of the Industrial and Civil Power Distribution Design Manual, the current carrying capacity must also be calculated by considering temperature and environmental factors. Now I just don't know if this device of yours is AC or DC? If it is AC, is it an inductive load or a capacitive load or a purely resistive load?

As for the calculation formula, it can be obtained by high school physics and college knowledge of electricity. With the current, you can choose the cable, and you can also roughly calculate it with the common formulas used by electricians.

In a three-phase 380V AC circuit, the specification of the wire diameter can be estimated using the method of estimation.

The motor load can be estimated according to the current of 2A per kW, the current of 150kW is about 300A, and the cross-section of the copper core wire can be selected according to the current of 6A per square millimeter;

The selected cross-section is (300 6 = 50mm2) copper core wire.

Combining theory and practice, generally 100 watts of corresponding current is 2A, 150KW current is 300A, 1mm can go 6-8A, so the calculation of 50mm copper cable can be, in order to avoid the impact of starting current can be used a larger level, more safe. 50*3+25*1 or 95*3+50*1, for reference.

150kw when power factor, current = 150

When the power factor is current=150

The 120 square GB cable has a safe current carrying capacity of 375 400A, which can meet your requirements.

The rated current of the three-phase 380V 90kw motor is 165-180A, and the copper core cable of 70-90 square meters can be used, and the three-phase 380V 150kw motor should be equipped with a 120 square copper core cable.

It's a 160 motor, if it's a design institute to design, he will choose a 185 cable, in fact, just use a 120 one.

It also depends on the use environment, high temperature and high heat? Humidity? What is the nature of the enterprise? What is the quality of the staff? 120-185 cable.

Choose 10 square aluminum wire or 6 square copper wire, the specific calculation method can refer to the following:

Principles for selecting wires:

1) Select by safe ampacity at close range:

aIn order to ensure the continuous operation of the wire for a long time, the allowable current density is called the safe ampacity.

b The general provisions are: copper wire selection 5 8a mm2; Aluminum wire selection 3 5a mm2.

c. The safe current carrying capacity should also be determined according to the extreme temperature, cooling conditions, laying conditions and other comprehensive factors of the core use environment of the wire.

2) On the basis of the safe current carrying capacity at a long distance, the voltage loss should be selected to ensure that the working voltage of the load point is within the qualified range;

3) Large load is selected according to the economic current density.

It is to make the transmission line conductor in operation, power loss, maintenance costs and construction investment and other aspects are the most economical. Depending on the difference.

The maximum number of hours of load utilization per year, so that different materials and safe current values per square millimeter are selected.

30kw three-phase load selection bus.

Rated current i=p

If it is a short distance (within a few tens of meters), 10 square millimeters, if it is a medium distance (within a few hundred meters), 16 square millimeters, 30kw single-phase load selection bus.

Rated current i = p ucos = 30

If it is a short distance (within a few tens of meters), 35 square millimeters, if it is a medium distance (within a few hundred meters), 50 square millimeters, other branches, three-phase load 1kw, single-phase load resistive load (such as electric lamp) is calculated as 1kw, inductive load (such as motor) 1kw

According to the calculation, the wire is selected according to the safe current carrying capacity, and the short distance is high, and the long distance is low.

For short distances, 16 square millimeters of copper wire is used. If the ambient temperature is high and the distance is long, then use 25 square millimeters of copper wire.

Please check yourself according to the table. This table will be of great use in the future.