As the name suggests, a reactor refers to a series connected inductor in a circuit. In the field of reactive power compensation and harmonic control, series reactors mainly refer to reactors connected in series with capacitors. The series connected reactor and capacitor form a resonant circuit.
To eliminate or filter harmonics. Reduce the surge current multiplier and surge frequency of the capacitor bank, protect the capacitors, and facilitate the selection of supporting equipment.
Form a complete resonant circuit together with the capacitor bank to filter out specific subharmonics. After the inductance of the series filter reactor and the capacitance of the capacitor are fully adjusted, an AC filter with characteristic subharmonics is formed to filter out the characteristic subharmonics, thereby reducing the voltage distortion of the harmonic on the bus and reducing the line. Harmonic current improves the power quality of the network and bus power supply.
A bias that forms a resonant circuit with the capacitor bank to suppress characteristic subharmonics. The premise 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 value of power grid harmonics and configure appropriate reactors based on the actual series resonant harmonic components.
Increase short-circuit resistance, reduce short-circuit capacity, and decrease short-circuit current. The reactive power compensation branch was previously connected in series with reactors. When a capacitor fault occurs (such as capacitor plate breakdown or ground fault), the system will provide short-circuit current through the system impedance and series reactor impedance. Because the impedance of a series reactor is much higher, in the event of a capacitor short-circuit fault, the system impedance will effectively reduce the short-circuit capacity, ensuring that the distribution circuit breaker can disconnect the short-circuit current and improve 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 capacitors. When the reactive power compensation capacitor bank in operation has multiple branches, if one of the capacitors fails, the other capacitor banks in operation will discharge through the faulty capacitor. Series reactors can effectively reduce this discharge surge current and ensure the disconnection of protective devices. The possibility of capacitor bank failure.
Reducing the switch surge current of the capacitor bank is beneficial for the arc extinguishing of the contactor. During the switching of capacitors by contactors, surge currents will be generated. Series reactors can effectively suppress the transient process of operating current, which is beneficial for the disconnection of contactor contacts, avoiding the reignition of arc light and causing overvoltage during operation. Reduce the amplitude of overvoltage and protect capacitors from the effects of overvoltage breakdown or insulation aging.
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