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Power.Tune Energy Saver Technical Aspect

Here is a smart way to save up to 30% of your electrical bill. This Power.Tune Energy Saving Device can filter the supply voltage while improving the efficiency and power factor of your electricity consumed.

This Power.Tune Energy Saving Device can potentially save up to 30% off your electricity bills simply by improving the efficiency and power factor of electrical appliances. The device is able to store electricity for 5 to 10 seconds and release it for use during the downside supply. It can also improve safety by reducing the overheating of electrical wiring, hence reducing the size of wiring and copper loss. (Precaution should be observed here, this does not imply that attaching multiple units of the Energy Saving Device will drastically reduce power consumption in all cases. Please consult a trained electrician if advice is necessary.

One unit (Single Phase) of this Power Tune Energy Saving Device will work on the whole circuit in your house as soon as you turn it on. Our field testing for most homes have consistently shown that one unit of the Power.Tune Energy Saving Device will save 3 to 4kwh per day, based on electrical consumption of 30kwh per day. The amount of savings depends on few factors, such as the type of electrical appliance use, the amount of electricity use and the location. Places near to shops, restaurants and light industries where the voltage supply is unstable and fluctuating will see higher savings.

In addition to extending the life span of appliance motor, this Power.Tune Energy Saving Device also reduces the reactive power generated by inductive loads. It helps the utility companies by eliminating interference to the power supply. This Energy Saving Device is tested by PSB (Singapore) and Sirim (Malaysia).

There are two components of power: reactive power and working power.

- Reactive power (kVAR) is used to create EMF in the inductive loads in your home and business. This power performs no "real" work.

- Working power (kW) is the power that performs the function of the load, i.e. turns the drive shaft.

- These two components combine to formulate Apparent Power (kVA), the total power which the load consumes. Apparent power is equal to the square root (sqrt) of kW2 + kVAR2.

- Power Factor is the ratio of working power (kW) to apparent power (kVA). In other words looking at all the power that a load consumes, how much of it (percentage wise) is used to perform the real work?

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Obviously, the lower the power factor, the lower the ratio between the apparent power and the working power, the more inefficient the load is.

The Power.Tune Energy Saving Device increases power factor, by reducing the amount of reactive power (kVAR) that the load draws from the utility company. This is accomplished by supplying the reactive power locally at the load by the use of capacitors. Capacitors store the reactive power (kVAR) needed for the creation of the EMF within the inductive load. As the motor operates, this reactive power is "pulled" and "pushed" to and from the capacitors by the motor. The amount of reactive power purchased from the utility company by a power factor optimization has been greatly reduced, or eliminated.

Low power factor is expensive and inefficient. Many utility companies charge you an additional fee if your power factor is less than 0.95. Low power factor also reduces your electrical system’s distribution capacity by increasing current flow and causing voltage drops. This fact sheet describes power factor and explains how you can improve your power factor to reduce electric bills and enhance your electrical system’s capacity.

What is Power Factor?

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To understand power factor, visualize a horse pulling a railroad car down a railroad track. Because the railroad ties are uneven, the horse must pull the car from the side of the track. The horse is pulling the railroad car at an angle to the direction of the car’s travel. The power required to move the car down the track is the working (real) power. The effort of the horse is the total (apparent) power. Because of the angle of the horse’s pull, not all of the horse’s effort is used to move the car down the track. The car will not move sideways; therefore, the sideways pull of the horse is wasted effort or nonworking (reactive) power.

The angle of the horse’s pull is related to power factor, which is defined as the ratio of real (working) power to apparent (total) power. If the horse is led closer to the center of the track, the angle of side pull decreases and the real power approaches the value of the apparent power. Therefore, the ratio of real power to apparent power (the power factor) approaches 1. As the power factor approaches 1, the reactive (nonworking) power approaches 0.

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Correcting Your Power Factor

Some strategies for correcting your power factor are:

• Minimize operation of idling or lightly loaded motors.

• Avoid operation of equipment above its rated voltage.

• Replace standard motors as they burn out with energy-efficient motors. Even with energy-efficient motors, however, the power factor is significantly affected by variations in load. A motor must be operated near its rated capacity to realize the benefits of a high power factor design.

• Install capacitors in your AC circuit to decrease the magnitude of reactive power.

Energy Saving Malaysia_8 As shown in the diagram at right, reactive power (measured in kVARs) caused by inductance always acts at a 90° angle to real power. Capacitors store kVARs and release energy opposing the reactive energy caused by the inductor. This implies that inductance and capacitance react 180° to each other.

The presence of both in the same circuit results in the continuous alternating transfer of energy between the capacitor and the inductor, thereby reducing the current flow from the generator to the circuit. When the circuit is balanced, all the energy released by the inductor is absorbed by the capacitor.

In the diagram below, the power triangle shows an initial 0.70 power factor for a 100-kW (real power) inductive load. The reactive power required by the load is 100 kW. By installing a 67-kW capacitor, the apparent power is reduced from 142 to 105 kVA, resulting in a 26% reduction in current. Power factor is improved to 0.95.

In the “horse and railcar” analogy, this is equivalent to decreasing the angle the horse is pulling on the railcar by leading the horse closer to the center of the railroad track. Because the side pull is minimized, less total effort is required from the horse to do the same amount of work.

Capacitor suppliers and engineering firms can provide the assistance you may need to determine the optimum power correction factor and to correctly locate and install capacitors in your electrical distribution system.         

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For example, using the power triangle illustrated below, if

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This indicates that only 70% of the current provided by the electrical utility is being used to produce useful work.

Cause of Low Power Factor

Low power factor is caused by inductive loads (such as transformers, electric motors, and high-intensity discharge lighting), which are a major portion of the power consumed in industrial complexes. Unlike resistive loads that create heat by consuming kilowatts, inductive loads require the current to create a magnetic field, and the magnetic field produces the desired work. The total or apparent power required by an inductive device is a composite of the following:

• Real power (measured in kilowatts, kW)
• Reactive power, the nonworking power caused by the magnetizing current, required to operate the device (measured in kilovars, kVAR)

Reactive power required by inductive loads increases the amount of apparent power (measured in kilovolt amps, kVA) in your distribution system. The increase in reactive and apparent power causes the power factor to decrease.

Why Improve Your Power Factor?

Some of the benefits of improving your power factor are as follows:

• Your utility bill will be smaller. Low power factor requires an increase in the electric utility’s generation and transmission capacity to handle the reactive power component caused by inductive loads. Utilities usually charge a penalty fee to customers with power factors less than 0.95. You can avoid this additional fee by increasing your power factor.

• Your electrical system’s branch capacity will increase. Uncorrected power factor will cause power losses in your distribution system. You may experience voltage drops as power losses increase. Excessive voltage drops can cause overheating and premature failure of motors and other inductive equipment.

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