Essential Skills For Electricians - How To Correctly Select Dc Reactors And Ac Reactors

First, let's learn about DC reactors. DC reactors are devices used to regulate DC current. Their main function is to limit the AC component superimposed on the DC current to a certain specified value, keep the rectified current continuous, reduce the current ripple value, improve the input power factor, and suppress the harmonics generated by the converter.

AC reactors are devices used to regulate AC current. Their function is to limit the current shock caused by sudden changes in grid voltage and operational overvoltage, smooth the spike pulses contained in the power supply voltage, or smooth the voltage defects generated when the bridge rectifier circuit is switched, effectively protect the power components inside the inverter and improve the power factor. It can not only prevent interference from the grid, but also reduce the pollution of the harmonic current generated by the rectifier unit to the grid.

So, what are the differences between DC reactors and AC Reactors?

1. The current directions of DC reactors and AC reactors are different. AC reactors are used in AC circuits, and there are three-phase AC reactors and single-phase AC reactors. DC reactors are used in DC system circuits, and there are only single-phase ones.

2. The use scope of DC reactors and AC reactors is different. DC reactors are mainly used in DC circuits, such as batteries, motors, etc. AC reactors are mainly used in AC circuits, such as household electricity, industrial electricity, etc. It is like DC reactors can only play a role in DC circuits, while AC reactors can play a role in AC circuits.

3. The working principles of DC reactors and AC reactors are different. In DC circuits, the AC amount is small, and the use of reactors is mainly for current stabilization, and the number of windings is large (large inductance). In AC circuits, it is generally used for phase shifting or filtering and voltage division, and does not require so many windings (small inductance).

Therefore, in real life, we should choose to use DC reactors or AC reactors according to specific needs, so that they can better play their roles.