Why is it important to consider harmonics in feeder calculations?

Considering harmonics in feeder calculations is crucial because they can lead to additional heating and losses within electrical systems. Harmonics are voltage or current waveforms that deviate from the fundamental frequency, typically caused by non-linear loads such as computers, LED lighting, and variable frequency drives. When harmonics are present, they can result in increased effective current flow, leading to higher losses in conductors and transformer heating.

This heating occurs because energy is dissipated as heat in the conductors due to higher frequencies that create a sort of additional resistance in the system. Moreover, excessive harmonics can also affect the performance of other equipment and reduce the lifespan of electrical components. Therefore, accounting for harmonics in calculations helps ensure that electrical systems operate efficiently, safely, and within design parameters.