The power of the intermediate frequency furnace is divided into active power, reactive power, power factor and apparent power.
1. The active power of the intermediate frequency furnace represents the amount of power absorbed by the intermediate frequency furnace in a unit time (1 s). Active power is always less than (at most equal to) apparent power. For example, if the voltage across the inductor is 50V and the current flowing through it is 4000A, the apparent power is 200kV A, and the active power absorbed by the workpiece and the inductor is 30 kW (power factor of 0.15), or 80kW (power factor is 0.4). It is the power consumed by the inductor and the workpiece for actual heating. The active power unit of the intermediate frequency furnace is Kw
2. The reactive power of the intermediate frequency furnace refers to the magnitude of the electromagnetic power when the electric energy and the magnetic energy are exchanged in the oscillating tank circuit composed of the intermediate frequency furnace inductor and the capacitor bank in the induction heating device of the intermediate frequency furnace. This means that a portion of the power supplied by the power supply is to be returned to the power supply by the oscillation tank circuit. The unit of reactive power is kvar, and its value is equal to the square difference between apparent power and active power and then squared, and the unit of reactive power of intermediate frequency furnace is Kvar
3. The power factor of the intermediate frequency furnace is the ratio of active power to apparent power (kW/kV.A), and its value indicates how much of the apparent power is absorbed by the active power in one cycle of electromagnetic oscillation.
4. In a sense, the apparent power of the intermediate frequency furnace is the sum of the active power P and the reactive power Q, the product of the voltage and the current in the circuit, and the unit is kV.A. For example, if the primary voltage of a transformer is 800 V and the current is 500 A, the apparent power is equal to 400kVA. In a DC circuit, the apparent power is equal to the active power, and "apparent" is meaningless at this time. In AC circuits, especially in the tank circuit of induction heating equipment, when electrical energy and magnetic energy are continuously exchanged, only a part of the energy is absorbed by the workpiece, just like in a 50Hz AC motor circuit, only a part of the energy is absorbed. The apparent power unit of the intermediate frequency furnace is Kvar.
In summary, the power concept of the intermediate frequency furnace is differentiated. When talking about the power of the intermediate frequency furnace, the power of the intermediate frequency furnace should be distinguished. Conventionally, the heating power of the intermediate frequency furnace refers to the active power of the intermediate frequency furnace.
