Introduction of incoming reactor for inverter - Delta

Reactors are also called inductors, and when a conductor is energized, a magnetic field will be generated in a certain space scale occupied by it, so all electrical conductors that can carry current have inductance in a general sense. However, the inductance of the energized long straight conductor is small, and the magnetic field generated is not strong, so the actual reactor is the method of winding the wire into a solenoid, which is called a hollow reactor; Sometimes, in order to make this solenoid have more inductance, an iron core is inserted into the solenoid, called an iron core reactor. Reactance is divided into inductive reactance and capacitive reactance, and the more scientific classification is that the reactor (inductor) and the capacitive reactor (capacitor) are collectively referred to as reactors, but because there were inductors in the past, and they were called reactors, so now people say that capacitors are capacitive reactors, and reactors specifically refer to inductors.

Introduction of incoming reactor for inverter - Delta

Introduction of incoming reactor for inverter - Delta

The common incoming reactor for inverter is generally iron-core dry, and the core of the incoming reactor for inverter is made of high-quality and low-loss cold-rolled silicon steel sheet, as shown in Figure 1. The air gap of the common incoming reactor of the inverter is made of epoxy laminated glass cloth plate as a distance to ensure that the air gap of the reactor does not change during operation, and the coil is wound with H-class enameled flat copper wire, which is placed tightly and uniformly, and the appearance is not covered with an insulating layer, and has excellent aesthetics and good heat dissipation function.

The fasteners of the core column part of the incoming reactor for the inverter are made of non-magnetic materials to reduce the eddy current heating phenomenon during operation; The exposed parts of the special incoming reactor for the inverter have been treated with anti-corrosion, and the tinned copper tube terminals are selected for the lead terminals; Compared with similar domestic products, the special incoming reactor for inverter has the advantages of small size, light weight and beautiful appearance, which is comparable to foreign well-known brands.

After the coil and the core of the incoming reactor for the inverter are assembled into one, the process of pre-baking → vacuum impregnation paint → thermal baking curing, and H-class impregnating paint is selected to firmly combine the coil and core of the reactor, which not only greatly reduces the noise during operation, but also has a very high heat resistance level, which can ensure that the reactor can operate safely and noiselessly at high temperatures; Non-magnetic materials are used for some fasteners of the core column of the incoming reactor to reduce the eddy current heating phenomenon during operation; The exposed parts are treated with anti-corrosion, and the tinned copper tube terminals are used for the exit terminals.

The incoming reactor for the inverter is an electrical appliance that relies on the inductive reactance of the coil to hinder the change of current, and the higher harmonics generated by the inverter are generally connected in series between the inlet end of the inverter and the power supply, and thus get its name. The special incoming reactor for inverter has the following functions:

1) Limit the voltage drop on the grid side during converter commutation;

2) Press the high-frequency harmonics that occur in the process of rectifying the inverter and the decoupling of the parallel converter group;

3) limit the jump in grid voltage;

4) Reduce the current impact that occurs during the operation of the power grid system;

5) the power factor of the improved frequency conversion system;

In the process of operation, the speed regulation system composed of the inverter is often subject to the impact from the inrush current and inrush voltage, which will severely damage the function and service life of the inverter and the governor, so it is necessary to add a line reactor between the power supply and the inverter to press the surge voltage and inrush current, effectively maintain the inverter, extend the service life of the inverter, and improve the power factor of the inverter, reduce the noise of the motor, and reduce the eddy current loss.

Because the inverter chooses the method of frequency conversion to regulate the speed, the high-order harmonics and waveform distortion often occur when the speed is regulated, which will affect the normal use of the equipment, for this reason, an incoming line reactor must be installed at the input end, which can improve the power factor of the inverter and press the harmonic current, filter out the harmonic voltage and harmonic current, and improve the quality of the power grid.

Introduction of incoming reactor for inverter - Delta

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