- Linear Loads.
- Non-linear Loads.
Linear Loads:-
A linear load is a load that generates a current waveform identical to the input voltage waveform. In other words, a load is said to be linear when the current drawn has the same waveform as the voltage across its terminals.
Non-linear Loads:-
A non-linear load is a load that generates a current waveform which is not following the voltage waveform. In other words, a load is said to be non-linear when the relation between the current and voltage is non-linear.
E.g. When a sinusoidal voltage is applied and the loads draw non-sinusoidal current then it is said that the load is a non-linear load.
Examples of Non-linear loads:-
1. Discharge lamps.
2. Fluorescent Lamps.
3. Video Monitor
4. Computer Hardware.
5. Variable Drives.
6. AC/DC Converters, etc.
CONSEQUENCES OF NON-LINEAR LOADS:-
– Increase in distortion on the distribution systems.
– High current in system neutral.
– Increase in current carrying conductor size.
– Derating of power source, transformer, and distribution network.
– Malfunctioning of protective devices due to the unpredictable nature of system current.