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1. For the power supply part of the power system, the generator that supplies electric energy is designed according to the required rated voltage and rated current. During long-term operation of the generator, the voltage and current cannot exceed the rated value, otherwise it will shorten its service life and even damage the power generation. machine. Since the generator is rated by the rated current and the rated voltage, this means that when the load is connected to the resistor, the generator is theoretically fully utilized, because cosØ=1 in P=U*I*cosØ; However, when the load is dry or capacitive, cosØ<1, the generator will not be fully utilized. In order to maximize the capacity of the generator, its power factor must be increased.
2. For the transmission part of the power system, the loss on the transmission line: Pl=RI*I, the average power absorbed by the load: P.=V*I*cosØ, because I=P./V/ cosØ, so Pl=R* P./V/cosØ (V is the effective value of the load terminal voltage). It can be seen from the above equation that increasing the power factor cos Ø will reduce the power loss on the transmission line when both V and P are constant!
In practice, increasing the power factor means:
1) Improve the quality of electricity and improve the operating conditions of the equipment to ensure that the equipment works under normal conditions, which is conducive to safe production.
2) It can save energy, reduce production costs and reduce the company's electricity expenses. For example, when the cosØ=0.5, the loss is 4 times that of cosØ=1.
3) It can improve the utilization rate of enterprise electrical equipment and give full play to the equipment potential of enterprises.
4) It can reduce the power loss of the line and improve the transmission efficiency of the power grid.
5) Due to the limitation of the generator's power generation capacity, increasing the cosØ will enable the generator to generate more active power.
In the actual power consumption process, increasing the power factor of the load is the most effective way to improve the utilization of power resources.
In the current situation where the available resources are close to scarcity, in addition to the development of new energy as soon as possible, better use of existing resources is the only way we can solve the urgent need. For power usage, which is currently used by humans and is extremely dependent on power consumption, power factor will be the most important.