Post by khatunejannat on Feb 15, 2024 1:35:48 GMT -5
Electrical devices transform the electrical energy they receive into another type of energy: light, in the case of lamps; calorific, in the heaters or mechanical, in the engines. All the electrical energy consumed does not translate into useful energy, there is a part that is lost. To measure the degree of efficiency of an electrical device, we have to know the relationship between the energy consumed and the energy that is useful. This is known as power factor. What is power factor? The power factor is, therefore, a unit of measurement of electrical efficiency, it is used to determine the level of performance of electrical equipment. As an example of these energy losses we can use electric motors. In the motors there are copper coils that generate an electromagnetic field when an electric current passes through them. This electric field moves an axis that produces the mechanical energy (useful energy in our case) that we need. But part of the energy consumed is lost in the creation of that electromagnetic field.
This energy is not useful because it is not transformed into mechanical energy. The same occurs in lighting using fluorescent tubes, where there is also a loss of energy that is not Saint Helena Email List converted into light energy. How to calculate power factor? The power factor is a number resulting from the ratio between the power consumed and the power generated. We can express it with this formula: PF (Power Factor) = absorbed energy / useful energy If the result is 1, it would be 100% use of the energy. It is an ideal situation because it implies that all the energy consumed is used. The higher the result of that quotient, the greater the degree of electrical use. Power factor of a motor In motors, the power used to produce work is called active or useful power, while the power used to generate the magnetic field, which is lost, is called reactive power . The apparent power would be the total absorbed power, and is the vector sum of the active power and the reactive power.
In alternating current, the relationship between these three powers is represented by the power triangle . The active power is one leg (S) and the apparent power (pa) is another leg. The smaller the angle formed by both legs, the better the power factor. How to correct the power factor in a motor? When the power factor of a motor is very low, we have to increase it so that so much energy is not lost and make it more efficient. To do this we will have to place capacitors in parallel, which provide an additional energy charge that reduces the current necessary to generate that electromagnetic field when motor starts. With this we manage to reduce energy consumption and also the penalties that electricity companies make for the consumption of reactive energy.
This energy is not useful because it is not transformed into mechanical energy. The same occurs in lighting using fluorescent tubes, where there is also a loss of energy that is not Saint Helena Email List converted into light energy. How to calculate power factor? The power factor is a number resulting from the ratio between the power consumed and the power generated. We can express it with this formula: PF (Power Factor) = absorbed energy / useful energy If the result is 1, it would be 100% use of the energy. It is an ideal situation because it implies that all the energy consumed is used. The higher the result of that quotient, the greater the degree of electrical use. Power factor of a motor In motors, the power used to produce work is called active or useful power, while the power used to generate the magnetic field, which is lost, is called reactive power . The apparent power would be the total absorbed power, and is the vector sum of the active power and the reactive power.
In alternating current, the relationship between these three powers is represented by the power triangle . The active power is one leg (S) and the apparent power (pa) is another leg. The smaller the angle formed by both legs, the better the power factor. How to correct the power factor in a motor? When the power factor of a motor is very low, we have to increase it so that so much energy is not lost and make it more efficient. To do this we will have to place capacitors in parallel, which provide an additional energy charge that reduces the current necessary to generate that electromagnetic field when motor starts. With this we manage to reduce energy consumption and also the penalties that electricity companies make for the consumption of reactive energy.