UK’s Leading Engineering Forum For Todays Engineer

Providing Regular Tips & Advice on Variable Speed Drives, Motors & Industry Related Topics

Category Archive: Harmonics

Feb
14
2018

What are the common effects of harmonic distortion?

The distortion in the waveform in the load current of any nonlinear device causes similar changes in the voltage waveform relative to the harmonic impedance of the source network. This voltage distortion affects both the current and voltage for all other loads connected to that system. The common effects of such harmonic distortion are as …

Continue reading »

Nov
09
2017

What is the principle of power factor correction and protection of capacitors?

Power factor correction principle// Loads such as induction motors draw significant reactive power from the supply system, and a poor overall power factor may result. The flow of reactive power increases the voltage-drops through series reactances such as transformers and reactors, it uses up some of the current carrying capacity of power system plant and …

Continue reading »

May
04
2017

What are harmonics and what do they do?

What are harmonics? The harmonics allow to represent any periodic waveform. In fact, according to Fourier’s theorem, any periodic function of a period T may be represented as a summation of: A sinusoid with the same period T; Some sinusoids with the same frequency as whole multiples of the fundamental; A possible continuous component, if the function …

Continue reading »

Nov
21
2016

How do you diagnose a potential harmonics related problem?

4 steps to diagnose a potential harmonics related problem // If a plant engineer suspects that he might have a harmonics related problem, the following steps can easily be performed as an initial investigation into potential problems: Step 1 Look for symptoms of harmonics as listed in Table 1 below. If one or more of …

Continue reading »