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# Power factor correction

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prepared by Jamilah Abbas
Building Services Eng.JKA PSA

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### Power factor correction

1. 1. POWER FACTOR CORRECTION<br />
2. 2. DEFINITION<br />the angle of this “power triangle” graphically indicates the ratio between the amount of consumed power and the amount of returned power. It also happens to be the same angle as that of the circuit's impedance in polar form. <br />When expressed as a fraction, this ratio between true power and apparent power is called the power factor for this circuit. Because true power and apparent power form the adjacent and hypotenuse sides of a right triangle, respectively, the power factor ratio is also equal to the cosine of that phase angle. Using values from the last example circuit: <br />It should be noted that power factor, like all ratio measurements, is a unitless quantity<br />
3. 3. FORMULA<br />
4. 4. DISADVANTAGES LOW POWER FACTOR<br />Cost for the electricity supply is high because voltage must be increased in order to obtain equalpower as electricity that is produced witha high power factor. This will cause the need to replace equipment such as generators, transformers and others.<br />
5. 5. 2. If the voltage cannotbe increased, the current should be increased to obtain equalpower of a high power factor. This will cause more spending in the conversion of cable size and current rating.<br />
6. 6. 3. With the increase voltage drop and copper losses, the efficiency decreases<br />