As the name suggests, an inductor is a component connected in series in a circuit (an inductor). In the industries of reactive power compensation and harmonic control, the series inductors are mainly those connected in series with capacitors. The series inductors and capacitors form a resonant circuit.

To eliminate or filter the effect of harmonics. To reduce the surge current multiplier and surge frequency of the capacitor bank, to protect the capacitors and facilitate the selection of matching equipment.

Together with the capacitor bank, it forms a complete resonant circuit to filter out the specific sub-harmonics. After the inductive reactance of the series filter reactor and the capacitive reactance of the capacitor are fully adjusted, an AC filter with characteristic sub-harmonics is formed to filter out the characteristic sub-harmonics, thereby reducing the voltage distortion of this sub-harmonic on the bus and reducing the line. Harmonic current improves the power quality of the network and the bus power supply.

A bias that forms a resonant circuit with the capacitor bank is used to suppress the characteristic sub-harmonics. The prerequisite is to understand the harmonics of the power grid, identify whether there are large rectifiers, arc furnaces, rolling mills and other loads that may generate harmonics, as well as whether there are high-voltage transformers and high-voltage motors. Poor performance. Take the actual values of the power grid harmonics and configure appropriate reactors based on the actual series resonant harmonic components.

Increase the short-circuit resistance, reduce the short-circuit capacity, and decrease the short-circuit current. The branch for reactive power compensation was originally a series reactor. When a capacitor fault occurs (such as capacitor plate breakdown or grounding fault), the system will provide the short-circuit current through the system impedance and the impedance of the series reactor. Because the impedance of the series reactor is much larger, when a capacitor has a short-circuit fault, the system impedance will effectively reduce the short-circuit capacity, ensuring that the circuit breaker can break the short-circuit current, and improving safety and reliability. The stability of the system.

Reduce the discharge current from the capacitor bank to the faulty capacitor bank and protect the power capacitor. When the reactive power compensation capacitor bank in operation has multiple branches, if one capacitor fails, the other operating capacitor banks will discharge through the faulty capacitor. The series reactor can effectively reduce this discharge surge current and ensure the activation of the protection device. The possibility of capacitor bank failure.

Reducing the switching surge current of the capacitor bank is beneficial for the arc extinction of the contactor. During the switching of the capacitor by the contactor, a surge current is generated. The series reactor can effectively suppress the transient process of the working current, which is conducive to the disconnection of the contactor contacts, avoids the re-ignition of the arc light, and causes no working overvoltage. Reducing the amplitude of the overvoltage protects the capacitor from being broken down by overvoltage or aging of insulation.