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Power Factor Meters

Home Measuring & Control Instruments Power Factor Meters

Before we introduce various types of power factor meters it is very essential to understand what are the needs of power factor meter? Why we do not directly calculate power factor in an a.c. circuit just by dividing the power with product of current and voltage as these readings can be easily obtained from wattmeter, ammeter and voltmeter. Obviously there various limitations of using this method as it may not provide high accuracy, also chances of increment of error is very high. Therefore this method is not adopted in industrial world. Measurement of power factor accurately is very essential everywhere. In power transmission system and distribution system we measure power factor at every station and electrical substation using these power factor meters. Power factor measurement provides us the knowledge of type of loads that we are using, helps in calculation of losses happening during the power transmission system and distribution. Hence we need a separate device for calculating the power factor accurately and more precisely.

Category: Measuring & Control Instruments
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Description

Advantages of Electrodynamic Type Power Factor Meters

(1) Losses are less because of minimum use of iron parts and also give less error over a small range of frequency as compared to moving iron type instruments.
(2) They high torque is to weight ratio.
Disadvantages of Electrodynamic Type Power Factor Meters
(1) Working forces are small as compared to moving iron type instruments.
(2) Scale is not extended over 360°.
(3) Calibration of electrodynamometer type instruments are highly affected by the changing the supply voltage frequency.
(4) They are quite costly as compared to other instruments.

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Near Union Metro Station, Deira P.O.BOX : 62421,
Dubai, UAE
+971 4 297 8779
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