About the overview of capacitance ark most belong to the perceptual load, the types of load in power system and power electronic equipment is widely used in electricity enterprise is, the grid power factor is low.
Reduces the equipment utilization, lower power factor increased power investment, damage the quality of voltage, reduce the service life of equipment, greatly increase the line loss.
In order to improve the power factor is low negative power waste of energy and the factors of production, must make the power grid, effectively improve the power factor.
Obviously if the reactive power will be provided by generators and transmitted over a long distance is not reasonable, is usually not possible.
Reasonable way is to produce reactive power reactive power, which increase reactive power compensation equipment and devices.
Structure in general, low voltage capacitor
compensation ark by ark shell, bus, circuit breaker, disconnecting switch, thermal relay, contactor, lightning arrester, capacitor, reactor, the primary and secondary wires, terminals, automatic power factor compensation control device, disk instrument, etc.
Basic principle in the practical power system, most of the load for asynchronous motor.
Its equivalent circuit can be regarded as the resistance and inductance in series circuit, the phase difference is larger, the electric current and voltage and power factor is low.
After the parallel capacitor (
As shown in the figure below)
, will offset part of the inductance current of capacitor current, so that the inductor current is reduced, less total current, voltage and current of the phase difference decrescent, increase power factor.
The ac motor capacitor
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