G.D. MOHANRAJ, "A need to review total harmonic distortion measurement in power systems", proceeding of Power Quality 1998, pp 151-155.

G.D. MOHANRAJ, "A need to review total harmonic distortion measurement in power systems", proceeding of Power Quality 1998, pp 151-155. Copyright - [Précédente] [Première page] [Suivante] - Home

Article : [99ART040]

Titre : G.D. MOHANRAJ, A need to review total harmonic distortion measurement in power systems, proceeding of Power Quality 1998, pp 151-155.

Auteur : Mohanraj, G.D. - Star Switchgears, Bangalore, India

Appears : in Power Quality '98
Pages : 151 - 155, Total Pages:285
Date : 1998
Stockage : Thierry LEQUEU
Lien : private/Standard1.pdf - 5 pages, 371 Ko.

Abstract :
Introduction of thyristor drives and different types of loading pattern have brought in a lot of distortion in the
waveforms, beyond the conventionally accepted 3rd, 5th, 7th, 11th & 13th harmonic disturbances. For analysis, the
waveforms are decoded by harmonic analysers into various harmonic elements, so that the added sum gives the final
waveform. This basic principle is based on Fourier series of estimation. The total harmonic distortion (THD) is
conventionally mentioned as THD.%=(/spl radic/(V2/sup 2/+V3/sup 2/....VN/sup 2//V1/sup 2/))/spl times/100% As this
value does not tally with the working parameters for comparison, the standards like IEEE 519, G 5/3 etc. have adopted
limitations by direct summation. This paper presents a need for reviewing both so that the measurements can be compared
easily with the working conditions. This is based on studies conducted at various sites during the last 8 years. Some of
the waveforms recorded are presented here. This would easily pave a way for providing simpler protection in the power
distribution systems.

Subject_Terms :
distribution networks; total harmonic distortion measurement; power systems; thyristor drives; loading pattern;
harmonic disturbances; harmonic analysers; Fourier series estimation; protection; power distribution systems;
voltage harmonics; current harmonics

Accession_Number : 6061443*
References : 5

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