Apparent power s; Active power p; Reactive power q; Power factor cos@ @ (symbol can't be typed, use @ instead).
Apparent power s = (square of active power p+square of reactive power q) is squared again, and power factor cos @ = active power p/ apparent power s.
Power factor is an important technical data of power system. Power factor is a coefficient to measure the efficiency of electrical equipment. The low power factor indicates that the reactive power of the circuit used for alternating magnetic field conversion is large, which increases the power supply loss of the line, so the power supply department has certain standard requirements for the power factor of the power consumption unit. In AC circuits, the cosine of the phase difference (φ) between voltage and current is called power factor, which is represented by the symbol COS φ. Numerically, the power factor is the ratio of active power to apparent power, that is, cos φ = p/s.
That is to say, because of this inductance, the KVAR value in the system is caused, and the relationship between them is a trigonometric function:
〖K_va〗^2=〖K_w〗^2+〖K_var〗^2
An active power factor correction circuit
An active power factor correction circuit
To put it simply, in the above formula, if the value of KVAR is zero today and KVA is equal to KW, then the electricity generated by the power supply bureau is equal to 1KVA, which is the most cost-effective, so the power factor is a factor that the power supply bureau is very concerned about. If the user does not reach the ideal power factor, it is relatively consuming the resources of the power supply bureau, so this is why the power factor is restricted by law. At present, in China, the power factor must be between 0.9 and 1, and below 0.9, it needs to be punished.