## Disadvantage of Low Power

Disadvantage of Low Power and Causes of low power factor , In this post you will know about what is causes and disadvantages of low power factor in electrical engineering .

### Power Factor

The power factor of a circuit can be defined as one of the following way

Disadvantage of Low Power Factor |

1. The cosine of angle between Voltage (V)and current (I) is known as power factor

2. it is the ratio of Resistance and Impedance

Power factor=R/Z= Resistance\Impedance

3.It is the ratio of true power and Apparent power

Power Factor = True Power/Apparent Power

For example , in a resistor , the current and voltage are in phase . Therefore, power factor of a pure resistive circuit is cos 0=1. Similarly , phase difference between voltage and current in a pure inductive or capacitive circuit is 90 degree.Hence power factor of pure L or c circuit is zero. This is the reason that power consumed by pure L or c is zero.

### Cause of low power factor

The following are the main causes of low power factor

- Transformers , generator and chocks are inductive loads which causes the current to lag behind the voltage. i.e., they operate at a lagging power factor . However , at normal loads , the magnetising current does not effect and lowers the power factor.
- The motors which are used in industries are mostly induction motors having inductive loads, which have low power factor . Normally the power factor of induction motors varies from 0.8 to 0.85
- Arc laps , heating furnaces ( Induction and are furnaces also operate at low power factor (lagging)

### What are the disadvantage of low power Factor

The higher current result in the following disadvantages

**Large conductor size :**To transmit or distribute a fix amount of power at a fixed voltage at low power factor , the conductor will have to carry larger current which will necessitate a large conductor size.**Large Copper Losses :**Due to more current carried by the conductor , large copper losses**Poor Voltage Regulation :**Due to power factor and increased currents, the voltage drop in transformers , alternators and transmission/ distribution lines is higher which results in poor voltage regulation**Large KVA rating of the equipment :**the output power of electrical machines e.g. alternators and transformers is always rated in apparent power**Poor Efficiency :**Due to the low power factor efficiency of all our system is decreased .

I think this information about disadvantage of low power and causes of low power factor will helpful for you . if you have more question then Comment us your question below

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