One. The significance of the progressive power factor.
1. Make full use of the ability of power equipment.
Each power supply unit has additional capacity, i.e. depending on the power. The total power output of the power supply equipment, - part of the active power, the other part is the reactive power, the smaller the active power in the circuit, the increased value can make the equipment of the same capacity to supply more power to the user. Then the energy utilization of the power supply equipment is improved.
A fluorescent lamp with 40 W (=0.4) can carry 400 bulbs at a power supply capacity of SN = 40 kVA, while an incandescent lamp with 40 W (=1) can carry 1000 bulbs.
It can be seen that the power factor has increased from 0.4 to 1, and the number of electrical appliances used in the normal power supply of the generator has also increased from 400 to 1000, so that the power supply is the same as the power supply, and the energy utilization rate of the power supply equipment has been greatly improved. When the UPS power supply voltage is punctual, the lower the power factor, the larger the current, and the greater the voltage drop and power loss on the power supply line.
Therefore, the lower the power factor of the electrical appliance, the greater the current absorbed by the electrical appliance from the power supply, and the greater the voltage drop and power loss on the line; The higher the power factor of the consumer, the less current the appliance absorbs from the power supply, and the smaller the voltage drop and power loss of the transmission line. Therefore, the improvement of the power factor can reduce the voltage loss and voltage loss of the power supply line.
For example, a 220V/40W incandescent lamp current is 0.18A; Since its cosφ=0.4 and current is 0.455A, it is clear that the voltage drop and power loss caused by the line resistance are also much larger.
If the voltage drop of the power supply line is too large, it will cause the power grid to be in a low-voltage operation state for a long time, affecting its normal operation. In order to reduce losses and improve the quality of power supply, it is necessary to improve the power factor.
Second, the method of improving the power factor.
1. Progress natural power factors.
The power factor of the power equipment itself is also called the natural power factor.
The correct selection of the motor makes the capacity of the motor match the mechanical load being dragged and avoids the phenomenon of "horse-drawn trolley".
The motor should not be allowed to idle as much as possible, and the power factor of the circuit can be improved by the active replacement of ^-Y wiring when the load is usually running at light load.
2. Turn on the capacitance compensation.
The current in the receiver load circuit lags behind the voltage, and 90 can occur after the capacitor is connected in parallel. The current of the capacitor branch is offset by the current that lags behind the voltage, so that the total current of the circuit is reduced, and then the impedance angle is reduced, and the power factor is improved.
The additional voltage of the capacitor is combined with the grid voltage, and the triangulation method should be selected.
UPS power supply factor is generally compensated to 0.9 or above, if the capacitance is too large, resulting in "overcompensation", it will make the circuit capacitive and reduce the power factor.
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