Analysis of apparent power, active power, reactive power, power factor, rated power - News - Global IC Trade Starts Here.

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1. Apparent power: In an AC circuit, due to inductive or capacitive energy storage equipment, there is a phase difference between voltage and current. Generally speaking, voltage and current do not arrive at the same time;
Therefore, the surface looks at the voltage and the current, and does not actually do so much work. There is energy conversion between the power supply and the energy storage device; so it is called apparent power.
Both active power and reactive power. Power transformers use apparent power to represent capacity in volt-ampere I*U (VA).
This means that regardless of the active power and reactive power, only such large voltage and current can be output.
2. Active power I*U*cosφ (W) and reactive power I*U*sinφ(Var): Maintain the electrical power required for normal operation of the electrical equipment, that is, convert the electrical energy into other forms of energy (mechanical energy, light energy) , thermal energy) electric power. Reactive power is abstract, it is used in electric and magnetic fields in circuits, and is used to establish and maintain electrical power in electrical equipment. For electrical equipment with electromagnetic coils, reactive power must be consumed to establish a magnetic field. Reactive power is by no means useless power, it is very useful. The motor needs to establish and maintain a rotating magnetic field to rotate the rotor, thereby driving the mechanical motion. The rotor magnetic field of the motor is established by taking reactive power from the power source. The transformer also needs reactive power to generate a magnetic field in the primary coil of the transformer and induce a voltage in the secondary coil. Therefore, without reactive power, the motor will not rotate, the transformer will not be transformed, and the AC contactor will not pull.
3. Power factor: In the AC circuit, the cosine of the phase difference (Φ) between voltage and current is called power factor, which is represented by the symbol cosΦ. In terms of value, the power factor is the ratio of active power to apparent power, ie The magnitude of cosΦ=P/S power factor is related to the load nature of the circuit. For example, the power factor of a resistive load such as an incandescent bulb or a resistance furnace is 1. The power factor of a circuit with an inductive or capacitive load is generally less than 1. Power factor is an important technical data for power systems. Power factor is a factor that measures the efficiency of electrical equipment. The low power factor indicates that the reactive power of the circuit for alternating magnetic field conversion is large, thereby reducing the utilization rate of the device and increasing the power loss of the line.
4. Rated power: In the DC circuit, the product of the rated voltage and the rated current is the rated power of the appliance. The output power of the power plant or the input power of the energy consuming device under normal operating conditions. Often in the "kilowatt" unit. It also refers to the power that the factory-produced machine can achieve during normal operation. That is, the power of a machine as commonly referred to. The rated power of the machine is constant, P = Fv, so the force generated by the machine is inversely proportional to the speed of operation. For example, when a car is driving on a flat asphalt road, the required traction force F is small, and the speed can be larger; when the road is not flat or when going uphill, the required traction is large, and it is necessary to switch to low speed.