- July 9, 2021
- Posted by: Dyaneshwar Nirmale
- Category: Digital Meters
Types of Electrical Energy
Electrical energy is classified into three types: Active Energy, Reactive Energy and Apparent Energy. The classification is based on the type of power: Active Power, Reactive Power and Apparent Power
1. Active Energy is defined by following equation: Active Energy (kWhr) =Active Power(kW) x Time (hr)
2. ReActive Energy is defined by following equation: Reactive Energy (kVArhr) =Reactive Power(kVAr) x Time (hr)
3. Apparent Energy is defined by following equation: Apparent Energy (kVAhr) =Apparent Power(kVA) x Time (hr)
Active Energy is further classified depending on direction of the power( Positive or Negative).
- Active Energy
- Active Energy Import
- Active Energy Export
- Reactive Energy
- Reactive Energy Import
- Reactive Energy Export
Direction of power depends on the quadrant (I,II,IIl or IV) in which the load is used.
The above diagram illustrates the direction of Active Power (P) and Reactive Power (Q) in all the four quadrants of measurement
When the sign of Active Power (P) is positive, it is called Import Active power and hence Import Active Energy. This is possible in Quadrant I and IV
When the sign of Active Power (P) is negative, it is called Export Active Power and hence Export Active Energy. This is possible in Quadrant II and III.
Similarly, when reactive Power (Q) is positive, it is referred to as import and when negative it is export.
Conclusion
To sum up, when the load consumes Active Power, Active Power is Positive and therefore called Import Active Energy. When the generator supplies active power, the sign of active power is negative and therefore called Export Active Energy
