Triplen Harmonics in Electrical Distribution Systems
Nikita Ingle, 301, Prajakta CHS, Plot No.32 , Sector 4, Koper khairne, Navi Mumbai (Maharashtra), India.
Manuscript received on 15 December 2015 | Revised Manuscript received on 25 December 2015 | Manuscript Published on 30 December 2015 | PP: 104-109 | Volume-5 Issue-2, December 2015 | Retrieval Number: B4372125215/15©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: In an AC circuit, a resistance behaves in exactly the same way as it does in a DC circuit. That is, the current flowing through the resistance is proportional to the voltage across it. This is because a resistor is a linear device and if the voltage applied to it is a sine wave, the current flowing through it is also a sine wave. But most electronic power supply switching circuits such as rectifiers, silicon controlled rectifier (SCR’s), power transistors, power converters and other such solid state switches which cut and chop the power supplies sinusoidal waveform to control motor power, or to convert the sinusoidal AC supply to DC. Theses switching circuits tend to draw current only at the peak values of the AC supply and since the switching current waveform is non-sinusoidal the resulting load current is said to contain Harmonics. we can say that “harmonics” are multiples of the fundamental frequency and can therefore be expressed as: 2ƒ, 3ƒ, 4ƒ, etc. Positive sequence harmonics (4th, 7th, 10th, …) causes overheating of transformer ,conductor power lines whereas negative sequence harmonics ( 2nd, 5th, 8th, …) circulates between phases producing additional problems in motor as opposite phasor rotation weakens rotating magnetic field required by the motor. There is another harmonics set called triplen means odd multiple of third harmonics ( 3rd, 6th, 9th, …), etc zero rotational sequence hence therefore zero sequence harmonics circulates between phase and neutral or ground.
Keywords: AC circuit, DC circuit, (SCR’s), AC supply to DC, “harmonics”, as: 2ƒ, 3ƒ, 4ƒ, ( 2nd, 5th, 8th, …),( 3rd, 6th, 9th, …)
Scope of the Article: Bio-Science and Bio-Technology