CAUSES OF LOW POWER FACTOR
In our carbonated drink analogy, low power factor resulted when the foam is large. Low power factor is caused by inductive loads, which are sources of reactive power.
Examples of inductive loads are:-
• Induction Motors
• High Intensity Discharge (HID) Lighting
Inductive loads constitute a major portion of power consumed by commercial and industrial sectors.
WOW, DOES LOW POWER COST YOU MONEY? YES, AND THAT'S WHY YOU NEED POWER FACTOR CORRECTION.
When your average monthly power factor falls below 85%, a surcharge is added to your electricity7 bill. The lower your power factor, the higher the surcharge. The rates fixed by TNB are as follow:
||1.5% per unit
||3.0% per unit
The percentage total of (A) and (B) will be levied on your electricity consumption for the month.
HOW TO TELL IF YOU HAVE LOW POWER FACTOR?
When there is additional sentence in the particulars column of your electricity bill as illustrated here.
HOW TO IMPROVE LOW POWER FACTOR? THROUGH POWER FACTOR CORRECTION
Poor power factor can be corrected in a number of ways:
||Installing automatically switched capacitors
The most common method used.
||Adjusting existing capacitors
Proper control and maintenance is essential to ensure the smooth running of the power factor corrective equipment.
||Upgrading of capacitors
Power factor corrective equipment has to be upgraded accordingly as the factory expands.
As harmonic current is being generated, careful consideration must be given to the design of power factor corrective equipment.
HOW POWER FACTOR CORRECTION HELP IN COST SAVINGS
Current bill – RM2,000.00
||[(0.85 - 0.80) / 0.01] x 1.5% x RM2,000 = RM150.00
||[(0.85 - 0.75) / 0.01] x 1.5% x RM2,000 = RM300.00
||[((0.85 - 0.75) / 0.01) x 1.5% x RM2,000] + [((0.75 – 0.60) / 0.01) x 3% x RM2,000] = RM750.00
POWER FACTOR CORRECTION SAVE YOUR MONEY!