How to determine the compensation ability?

Most of the loads in power system are dynamic loads, that is, while consuming active power, some reactive power (inductance) is needed to work normally. Compensation means that the power supply only provides active power and a small part of reactive power, so that the load current flowing through the line is relatively small, thus reducing power loss. Capacitance compensation can also improve voltage quality.

The selection of compensation capacity is usually configured according to the principle that the reactive components of transformer capacity are equal. For example, for a transformer with a capacity of 400KVA of 10KV, it is generally considered that the rated power factor of the transformer is 0.8 and the sinφ is 0.6, and the capacitor compensation of 400 * 0.6 = 240kVA can be configured.

Each capacitor is marked with the capacitor capacity. If it is a three-phase capacitor, it is marked with 30KVAR, indicating that the capacitance is 30KVAR. If it is a single-phase capacitor, it can be connected in a triangle or star shape according to the rated voltage requirements. For example, three 10KVAR single-phase capacitors with a total capacity of 30KVAR.

Relationship between capacity and capacitance: Q = UUΩ C (single phase) Q = 3U Ω C (three phase) U and C are phase values.

The total capacitance of the three-phase capacitor is 3 * C.