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Motors
"Energy Management for Motor Driven Systems"
Office of Industrial Technologies, Energy Efficiency and Renewable
"Excessive current draws due to low power factors also cause excessive system voltage drops. Operating motor-driven equipment under low voltage conditions results in efficiency decreases, motor overheating, and subsequent diminished motor life. By adding power factor correction capacitors, you can restore operating voltage to proper design conditions." Pg. 94
"Making Permanent Savings through Active Energy Efficiency"
"Two areas frequently overlooked are those of harmonics and power factor. These invisible characteristics of an electrical system can influence consumption, costs, and even life expectancy of equipment.
Consumers with poor power factor waste electricity and incur additional costs–often without knowing it.
Power factor relates to the electricity used in simply energizing the internal coils of a piece of equipment.
The charges for this ‘useless’ or wasted energy can be hard to identify. The remedy is very simple use capacitors to store power." Pg. 11
Can Motor Manufacturers design products with High Power Factor?
Add power factor correction capacitors to your in-plant distribution system.
Power capacitors serve as leading reactive current generators and counter the lagging reactive current in the system. By providing reactive current, they reduce the total amount of current your system must draw from the utility. Power capacitors serve as leading reactive current generators and counter the lagging reactive current in the system. By providing reactive current, they reduce the total amount of current your system must draw from the utility.
Power Factor Improvement
Size motors as close as possible to the horsepower demands of the load.
A lightly loaded motor requires little real power. A heavily loaded motor requires more real power.
Since the reactive power is almost constant, the ratio of real power to reactive power varies with induction motor load, and ranges from about 10 percent at no load to as high as 85 percent or more at full load. An oversized motor, therefore, draws more reactive current at light load than does a smaller motor at full load. Low power factor results when motors are operated at less than full-load. This often occurs in cyclic processes (such as circular saws, ball mills, conveyors, compressors, grinders, extruders, or punch presses) where motors are sized for the heaviest load.
In these applications, power factor varies from moment to moment. Examples of situations where low power factors (from 30 percent to 50 percent) occur include a surface grinder performing a light cut, an unloaded air compressor, and a circular saw spinning without cutting.
Excerpts from “Energy Management for Motor Driven Systems”, Office of Industrial Technologies, Energy efficiency and renewable energy, US Department of Energy, Chapter 8, Power Factor Correction
Low Power Factor costs your Industrial Facility money
Many Electricity providers, including Con Edison, the Public Service Commission (PSC) in New York State, introduced a new reactive power charge. "Large commercial customers will be charged when their power factor, or efficiency, is less than 95 percent."
Kvar Saves Money on Motors in Industry
- Reduces I²R Losses
- Reduces Demand Charges
- Increases System Capacity
- Electric Motors run cooler
- Improves Voltage Regulation
- Increases Motor Life
- Green Technology
Why Choose Kvar National?
