Three types of reactive power compensation for low-voltage power capacitors

Low voltage power capacitors are widely used in the field of reactive power compensation, but their understanding of humans is relatively shallow, making it difficult to make timely and correct judgments, which can easily cause certain economic losses.

In order to avoid some unnecessary consequences, today's article editor will provide a detailed introduction to the basic principles of low-voltage power capacitors to understand them!

Three types of reactive power compensation for low-voltage power capacitors:

The main function of power capacitors is reactive power compensation, which has three main manifestations: fines, fines exceeding standards, and rewards reaching standards. This also extends the three basic principles of capacitors - lack of compensation, overcompensation, and complete compensation.

1. Indemnity owed

Undercompensation is more common in reactive power compensation, generally referring to the inductive reactive power generated during the operation of electrical equipment. The compensating capacitor current is smaller than the cancelled inductor current, but there is still a certain amount of inductive reactive current.

At this time, if the power factor is less than 1 but still close to 1, it is considered that the power factor does not meet the relevant standards, and there is a certain penalty for adjusting electricity fees.

2. Overcompensation

Excessive investment in power capacitors at once often results in some capacitor currents even after all inductor currents have been cancelled out.

In the case of excessive compensation, if the power factor is still less than 1, and reverse reactive power is done due to excessive compensation, the electricity fee will still be fined.

3. Full compensation

Full compensation refers to the strict configuration of power capacitors according to the actual inductive load current in the power grid. After being put into use, all inductive currents can be cancelled out. At this point, the power factor value is equal to 1.

Like under compensation and over compensation, full compensation is abnormal and may increase the failure rate of related power equipment due to current resonance.

The normal compensation principle should be to control the compensated power factor within a range of less than 1 but as close to 1 as possible. Only in this way can the power grid company receive rewards for subsidizing electricity bills.