The magnitude of the power factor is related to the load nature of the circuit, such as the load of incandescent bulbs, resistance furnaces and other resistive properties, the power factor is; Generally, the power factor of the load with inductive nature is less than 1; Loads of capacitive nature with a power factor greater than 1; The power factor reflects the ratio of electricity doing useful work to the total electricity.
Power factor oower factor - a In AC circuits, the cosine of the phase difference (Φ) between voltage and current is called the power factor, which is represented by the symbol cos heart, and in numerical terms, the power factor is the ratio of the active power and the apparent power, that is, the correct name should be high and low. Of course, the higher, the better. When the active power is constant, the purchased reactive power is less when the power factor is high, and vice versa. For example, when the power factor is 0.8, the active power is 8kw, and the reactive power is 6kvar.
1. Why is the power factor not the higher the better, but about 0.9 is the best?
Is it better to talk about the power factor in the low-voltage distribution network in the operation of the power grid, what we hope is that the power factor is as large as possible, otherwise it will produce the following we do not thus, in order to improve the power system and inductance (motor) load consumption of active energy and also consume reactive energy, although the reactive energy charges, but the power grid needs to increase the transmission of reactive current, and the circuit loss also increases. In order to reduce line losses, the enterprise is regulated.
2. Is the larger the power factor, the better, the larger the UPS power factor, the better?
The supplier also said that the larger the power factor, the better, so the manufacturer tried its best to improve this factor. In the end, is the power factor of UPS better or smaller? UPS has two power factor values: small capacity, things are easy to do, if you mistakenly buy 150kVA to 100kVA, and mistakenly buy 300kVA to 200kVA load, it is even more fine. This.... As for the difficulty of achieving a high power factor or a low power factor.
3. Is the "power factor" higher or lower? Or what is the best value to come around?
Of course, the higher the power factor, the better, but no matter how high it is, it can only ≤ 1, the closer to 1, the better, the higher the useful work, such as 1 generator, the capacity is 400KVA, the power factor is 0.8, it can only output 320KW of power, if the power is more about the power factor is good or small.
Fourth, is the reactive power as large as possible?
Of course, the reactive power of the general enterprise is as small as possible, because the power bureau should assess the power factor, if the power factor of the enterprise is too low, that is, the reactive power can not be too large: so many enterprises have reactive power compensation devices, of course, reactive power is more about the power factor is better or small.
There is no big or small good, as long as it is appropriate. Some household appliances themselves must be high-power, but if it is the same household appliance, the greater the power, the greater the power consumption, and the greater the power, the more fire danger is the question of whether the power factor is good or small.