What role does input and output reactor play?
Enter the reactor to suppress the surge voltage and surge current protection, frequency converter, and prolong its service life and prevent the harmonic interference, at the same time as the speed control inverter adopts frequency conversion mode, so often produce harmonics and waveform distortion in the speed, will affect the normal use of equipment, therefore, should be installed in a line choke the input end of the inverter can improve the power factor and harmonic current suppression filter, harmonic voltage and harmonic current, improve the quality of power grid.
The output reactor for the effective transmission distance of extended frequency converter, the instantaneous pressure effectively suppress the IGBT module when switching inverter, reduce noise, reduce the eddy current loss, protection of power switching devices within the inverter.
The input reactor is mainly used to restrain the interference of the higher harmonic produced by the converter to the power supply and other equipments. The output reactor is mainly used to restrain the damage of the higher harmonic caused by the converter.
The working principle of the reactor: the interference of capacitance and inductance in the circuit to the AC is called reactance. The inductor has the function of restraining the change of the current and the phase shift of the alternating current, and the winding static induction device with inductance is called a reactor. The dead are common reactor used in the power system with series reactor and shunt reactor. Series reactors are mainly used to restrict short circuit currents, and are connected in series with or parallel with capacitors in filters to limit the higher harmonics in the power grid. Reactors in the 220kV, 110kV, 35kV, and 10kV power grids are designed to absorb charging, capacitive, reactive, and reactive power in cable lines. The operating voltage can be adjusted by adjusting the number of shunt reactors.
The working principle of frequency converter:Normally, a device that changes the alternating current of voltage and frequency to a voltage or frequency variable alternating current is called a frequency converter". The device must first convert three-phase or single-phase AC to direct current (DC). Then the direct current (DC) is converted to three-phase or single-phase alternating current (AC). The frequency converter changes the output frequency and voltage at the same time, that is to change the N0 on the motor running curve, so that the motor running curve is parallel and downward. Therefore, the frequency converter can make the motor start with a smaller starting current to obtain a larger starting torque, that is, the frequency converter can start heavy load, and the inverter has the basic functions of voltage regulation, frequency modulation, voltage regulation, speed regulation and other basic functions
