Title: SIMPLE METHOD FOR DETERMINING HARMONIC SEQUENCES IN A MACHINE, TRANSFORMER OR NETWORK

Issue Number: Vol. 6, No. 2
Year of Publication: Apr - 2016
Page Numbers: 112-121
Authors: Claude Ziad Bayeh
Journal Name: International Journal of Digital Information and Wireless Communications (IJDIWC)
- Hong Kong
DOI:  http://dx.doi.org/10.17781/P002027

Abstract:


Harmonics in power systems are very dangerous and may cause different problems for equipment, i.e. the third harmonic has the same amplitude and angle in each phase of a three phase system. It enters into the neutral and may damage or overheat it if the system is unbalanced. The fifth harmonic causes an inverse polarity in machines where the magnetic field rotates in the opposite direction than the normal magnetic field, this causes the rotor to reduce its speed. Harmonics can produce different distortions for all equipment, and may breakdown some of them and damage other sensitive equipment. They reduce the lifetime of super-capacitors and other equipment, etc. These harmonics are caused by non-linear loads or natural disasters. Thus, it is very important to analyze these harmonics and filter them. For many engineers, it is necessary to arrange harmonics into three sequences, direct sequence, inverse sequence and homopolar sequence. Therefore, to arrange these harmonics, they have introduced many methods, but unfortunately, till now the traditional methods are complicated and take a longer time to find the harmonic sequences. Moreover, students find difficulties in the traditional methods and need some faster and simpler method to help them determining the sequence of harmonics, whatever is their range. For this reason, this paper proposes a new method to determine harmonic sequences in the easiest and fastest way.