Three phase electric current knows how to calculate the electrical power of the device

Three-phase electric power calculation formula:

There are three types of power, active power P, reactive power Q and apparent power S.

The cosine of the phase difference ( ) between voltage and current is called the power factor, which is represented by the symbol cos, and numerically, the power factor is the ratio of the active power to the apparent power, i.e., cos = p s

The three power and power factor COS is a right-angled power triangle: the two right-angled edges are active power, reactive power, and the hypotenuse is the apparent power.

Active power squared + reactive power squared = apparent power squared.

In a three-phase load, all three types of power are always present at the same time at any time

Apparent power s=

Active power p=

Reactive power q=

Power factor cos = p s

sinφ=q/s

The three-phase electric current is known, and the formula for calculating the electrical power of the equipment is as follows: active power p = for details.

For quick calculations, see .

1. If it is a three-dimensional symmetrical resistive load, it is 3*220*current.

2. If it is a three-phase asymmetric resistive load, then the sum of the three-phase currents is multiplied by 220

3. If it is an inductive load, it also involves the power factor, it is best to connect an energy meter, and then calculate the power of the electrical appliance according to the relationship between the number of revolutions and electric energy on the meter for a period of time.

Let the three-phase power balance, the generally measured three-phase current is mostly the phase current, and the three-phase voltage is the line voltage, so the formula for calculation is p = line voltage * phase current * power factor.

The formula for calculating the electrical power of the device: p=

In the low-voltage three-phase four-wire power supply line, depending on the wiring method of your electrical equipment, if the triangle wiring, 380*3* (A phase current + B phase current + C phase current); If the star wiring, 220*3* (A phase current + B phase current + C phase current);

It is calculated using the formula: p u 3 cos.

u: measured power supply voltage;

measured load current;

COS: The power factor of the load.

Three-phase electricity, knowing the current of 3 phases, how to calculate the power (how many kilowatts)?

Hello dear! Three-phase electricity, know the current of 3 phases, how to calculate the power is as follows: 1. Formula:

Power = (electric pressure * current * power factor) 10002, which is the early calculation: p = description: 3 (root number 3) =, power factor selection.

The power factor is generally represented by the symbol cos, cos: the power factor of different loads is different, and the accurate value is only known by measuring with an instrument. Three-phase 380V 150A carries about 79-80 kW of power under normal conditions.

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The formula for calculating the power of three-phase electricity is: p= 3*u*i*cos where p represents power, u represents voltage 380v, i represents current, and cos represents power factor.

where: p: power, u: line voltage, i: current, cos: power factor, 3 take the power factor cos For resistive loads, take the value of 1, and the power factor cos For inductive loads, such as motors, take the value.

Three-phase electrical power is a physical quantity that indicates how fast or slow the work of an electric current is, and the magnitude of the power of an electrical appliance is numerically equal to the amount of electrical energy it consumes in 1 second. If in"t"(Si unit is S) The electrical energy "W" (Si unit is J) consumed for such a long period of time, then the electrical power of this appliance is p=w t (definition) The electrical power is equal to the product of the voltage at both ends of the conductor and the current passing through the conductor.

The symmetrical three-phase power supply and the symmetrical three-phase load are connected to each other, which is called a symmetrical three-phase circuit (in general, the power supply is always symmetrical). The connection between the three-phase power supply and the load is y-y, -y, -y- connection.

A three-phase circuit is actually a special type of sinusoidal AC circuit. In a three-phase circuit, the connection of the three-phase load is determined by the rated voltage of each phase of the load and the line voltage of the power supply.

Since the response of each group in a symmetrical three-phase circuit is a symmetry of the inverting sequence with the excitation. Therefore, each phase is not only equal to the RMS of phase voltage, but also to the RMS of phase current. And the phase difference between the voltage and the current in each phase is also equal. Thus the active power of each phase is equal.

If you ignore the impedance line, the line voltage is equal to the line voltage side and the load supply side. The two star-shaped connections of the middle line with a neutral low-voltage power network are called four-phase three-wire systems, and wireless ones are called three-phase three-wire systems.

Summary. The method of calculating the electricity consumption of the current used in the three-phase electricity is: The method of calculating the electricity consumption of the three-phase electric current:

First of all, you can calculate the power of the device w:p=, where the power factor cos is taken, or calculated according to the power factor of the device. If the active power of the electrical appliance is 1000W, the current consumption in 1 hour is 1kWh, that is, 1 kWh.

According to the calculation of the power kw of the device, the working time, you will know the electricity consumption.

How to calculate the electricity consumption of the current used in three-phase electricity.

The method of calculating the electricity consumption of the current used in the three-phase electricity is: The method of calculating the electricity consumption of the three-phase electric current: first, the power w::

p=The power factor cos in the formula is taken, or calculated according to the power factor of the device. If the active power of the electrical appliance is 1000W, the current consumption in 1 hour is 1kWh, that is, 1 kWh. According to the calculation of the power kw of the device, the working time, you will know the electricity consumption.

For three-phase electricity, the electricity consumption can be calculated according to the single-phase electricity consumption, that is, the three-phase electricity consumption is equal to the electricity consumption of phase A plus the electricity consumption of phase B plus the electricity consumption of phase C, and the electricity consumption of three-phase balanced three-phase electricity is equal to three times the electricity consumption of single-phase electricity, for example, the electricity consumption of three-phase electricity with 380V voltage is equal to 3 times 220 times the current multiplied by the time.

The rated current of three-phase electricity refers to the wire current, and the rated voltage refers to the line voltage. If the voltage U, the apparent power of the load S (apparent power of the three-phase electrical output) and the power factor COS are known, the active power p of the load can be found first, and then the current i can be found. The specific method is as follows:

1. The active power p of the load is: p=s cos

2. The line current i is: i=p (3 u).

For three-phase star loads, the current of the load is the line current; For a three-phase delta load, the load current is the phase current, which is equal to 3 times the phase current.

Answer: The method of calculating the electricity consumption with the current used in three-phase electricity is as follows: 1. First, calculate the active power of three-phase electricity, which can be calculated by applying the following formula:

Active power = three-phase electric voltage * three-phase electric current * three-phase electro-hydraulic bend power factor 2, and then calculate the amount of electricity used by three-phase electricity, which can be calculated by applying the following formula: use the residual power (ruined degree) = active power (kWh) 1000 (kWh) 3, and finally calculate the electricity cost of three-phase electricity, which can be calculated by applying the following formula: electricity fee (yuan) = electricity consumption (kWh) * electricity price (kWh).