Topic: Power Factor
Define the following?
Real Power or Active Power
Real Power is the power that is actually converted into useful work for creating heat, light and motion. Reactive Power
Reactive Power is the power used to sustain the electromagnetic field in inductive and capacitive equipment. It is the nonworking power component. Reactive power
Total Power or Apparent power is the combination of real power and reactive power. Total power is measured in kilovolt-amperes (kVA) and is totalized by the electric billing meter in kilovolt-ampere-hours (kVAH).
ELECTRICAL LOADS: In general, electrical systems are made up of three components: resistors, inductors and capacitors Capacitive Load
The power factor for capacitors is leading. Therefore capacitors are installed to counteract the effect of reactive power used by inductive equipment.
Inductive equipment requires an electromagnetic field to operate. Because of this, inductive loads require both real and reactive power to operate. The power factor of inductive loads is referred to as lagging, or less than 100%, based upon our power factor ratio. Inductive loads include fluorescent lights, AC induction motors, arc welders and transformers. Motor Example
For a motor that is rated at 5 kilowatts to run for 200 hours, the real power measured would be the following: 5 kW x 200 hours = 1,000 kWH
Because the motor is an inductive load, the total power measured by the billing meter could be 1,400 kVAH. PF = 1,000 kWH/1,400 kVAH x100
PF = 71.4%
Resistive loads include incandescent lights, baseboard heaters and cooking ovens. Baseboard Heating Example
For a baseboard heater that is rated at 1 kilowatt to run for an entire month (30 days x 24 hours per day = 720 hours), the real power measured would be the following: 1 kW x 720...
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