Transcription of POWERFACTOR CORRECTION (pfc)
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POWERFACTOR CORRECTION (pfc)
power FACTORCORRECTION22 IEE Wiring Matters |Spring 2006 | FACTOR is the ratio between the useful (true) power (kW) to the total (apparent) power (kVA)consumed by an item of electrical equipment or acomplete electrical installation. It is a measure of howefficiently electrical power is converted into usefulwork output. The ideal power factor is unity, or less than one means that extra power isrequired to achieve the actual task at current flow causes losses both in the supplyand distribution system. A load with a power factor results in the most efficient loading of the load with a power factor of, say, , results in muchhigher losses in the supply system and a higher billfor the consumer. A comparatively small improvementin power factor can bring about a significantreduction in losses since losses are proportional to thesquare of the the power factor is less than one the missing power is known as reactive power whichunfortunately is necessary to provide a magnetisingfield required by motors and other inductive loads toperform their desired functions.
Power factor correction is achieved by the addition of capacitors in parallel with the connected motor or lighting circuits and can be applied at the equipment, distribution board or at the origin of the installation. Static power factor correction can be applied at each individual motor by connecting the correction capacitors to the motor starter.
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