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# Power factor improvement of an induction motor

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### Power factor improvement of an induction motor

1. 1. Power Factor Improvement Of An Induction Motor Harshit agarwal 22Under guidance of: Atul kumar sahu 16Mr. Mohamed Samir Ashish kumar singh 14 Ashish pani vimal 15
2. 2. Introduction Of Induction Motor•Singly Excited A.C machine.•Its stator winding is directly connected to A.C source. Whereas its rotor winding receives its energy by Induction(Transformer Action).• No load Current in Induction Motor varies from 30 to 50 % offull load current.•In Induction motor magnetizing current (lagging nearly 90degree behind the applied voltage) forms a considerableportion of No load current that’s why Induction motor have lowpower factor at no load.•The effect of low value of a No load Power Factor is todecrease the Full Load Operating Power Factor of Inductionmotor.
3. 3. Introduction Of Power Factor• Working /Active Power: Normally measured in kilowatts(kW). It does the "work" for the system--providing themotion, torque, heat, or whatever else is required.• Reactive Power: Normally measured in kilovolt-amperes-reactive (kVAR), doesnt do useful "work." Itsimply sustains the electromagnetic field.• Apparent Power: Normally measured in kilovolt-amperes (kVA). Working Power and Reactive Powertogether make up apparent power.
4. 4. To understand power factor, visualize a horse pulling a railroad cardown a railroad track. Because the railroad ties are uneven, thehorse must pull the car from the side of the track. The horse ispulling the railroad car at an angle to the direction of the car’stravel. The power required to move the car down the track is theworking (real) power. The effort of the horse is the total(apparent) power. Because of the angle of the horse’s pull, not allof the horse’s effort is used to move the car down the track. Thecar will not move sideways; therefore, the sideways pull of thehorse is wasted effort or nonworking (reactive) power.
5. 5. Power Factor FundamentalPower Factor : A measure of efficiency. The ratio of ActivePower (output) to Total Power (input) Power Factor = Active (Real) Power Active Power (kW) Total Power Reactive Power = kW Total Power (kVA) (KVAR) kVA = Cosine (θ) = DISPLACEMENT POWER FACTORA power factor reading close to 1.0 means that electrical poweris being utilized effectively, while a low power factor indicatespoor utilization of electrical power.
6. 6. Why do we care about Power Factor?• Low power factor results in: – Poor electrical efficiency! – Higher utility bills ** – Lower system capacity – On the Supply Side, Generation Capacity & Line Losses• Good Power Factor results in: Environmental benefit. Reduction of power consumption due to improvedenergy efficiency. Reduced power consumption means less greenhouse gasemissions and fossil fuel depletion by power stations. Reduction of electricity bills. Reduction of I2R losses in transformers and distribution equipment Reduction of voltage drop in long cables. Extended equipment life – Reduced electrical burden on cables andelectrical components.• Power Factor Correction Capacitors (PFCC) provide an economical means for improving Energy utilization
7. 7. Why do we install Capacitors?Before After  In this example, demand was reduced to 8250 kVA from 10000 kVA.  1750KVA Transformer Capacity Release.  The power factor was improved from 80% to 97%
8. 8. Power factor correction Of induction motor•Power factor correction is the term given to a technology that hasbeen used since the turn of the 20th century to restore the powerfactor to as close to unity as is economically viable.•This is normally achieved by the addition of capacitors to theelectrical network which compensate for the reactive powerdemand of the inductive load and thus reduce the burden on thesupply. There should be no effect on the operation of theequipment.•To reduce losses in the distribution system, and to reduce theelectricity bill, power factor correction, usually in the form ofcapacitors, is added to neutralize as much of the magnetizingcurrent as possible.•Capacitors contained in most power factor correction equipmentdraw current that leads the voltage, thus producing a leadingpower factor