Question

What are the disadvantages of harmonics?

Answer 1

Harmonics: -

1. A harmonic is a wave or signal whose frequency is a multiple of the frequency of the same reference signal or wave by an integral (whole number).
2. The frequency of such a signal or wave relative to the frequency of the reference signal or wave is another aspect of the harmonic series that the phrase might refer to.

Disadvantages of harmonics: -

Three main categories can be used to further divide harmonic issues' symptoms:

Equipment malfunction: -

Examples of equipment malfunction and failure linked to harmonics in a power supply include the following symptoms:

1. Heating up (motors, cables, transformers, neutrals)
2. Motor tremors
3. Transformers and whirling devices make audible noise.
4. Nuisance operating a circuit breaker
5. Lightning strikes
6. Notching of voltage
7. Unstable operation of electronic equipment
8. Lockups on computers or PLCs
9. Faulty voltage regulator
10. Mistakes in timing or the digital clock
11. Faulty generator regulator
12. Flashing LED lights

Finance-related factors: -

Economic factors that should be taken into account when considering harmonics include the following:

1. Loss of effectiveness (motors)
2. Cable and transformer losses in kW
3. Overall power factor is low
4. Size of generators
5. Size of UPS
6. Capacity issues (transformers, cables)

The use of capacitors for power factor correction: -

1. Special attention must be paid to harmonics when using power factor correction capacitors.
2. Failures of capacitors breaker or fuse (feeding capacitors) annoying tripping harmonic resonance conditions, either calculated or measured (series or parallel resonance)