Original scientific paper

FIELD INVESTIGATIONS INTO HARMONICS POLLUTION AFFECTING TRANSFORMERS

Subhash Kumar Joshi ; IIT Roorkee, India
Hari Om Gupta ; IIT Roorkee, India
Pramod Agarwal ; IIT Roorkee, India
Ganesh Kumbhar ; IIT Roorkee, India

Abstract

Field investigations on harmonics caused by loads are essential to have a quantitative
visualization and formation of premise of research. Field investigations have been carried out covering
spectrum of loads and voltage levels right from generation to consumers, as at present. Investigations
have revealed that low tension consumers form cluster of non-linear loads and are major contributors of
current harmonics. Traction loads are another major category of harmonic pollutant. Industrial consumers
do provide reactive compensation which helps to filter out current harmonics partially. However, in
absence of any regulatory measure consumers keep polluting current harmonics into the system and also
bear with the consequential disturbances. Voltage harmonics are significant only at leaf ends of
distribution distribution system, where source impedance, seen by the harmonics generated by the load,
is high. Tranasformer is the first major equipment in power system to intercept the harmonics. These
harmonics caused accelerated ageing of transformers and even objectionable rise of temperature of
cover-plate and turets.

Keywords

Current Harmonics; Voltage Harmonics; Total Harmonic Distortion; Crest Factor

Hrčak ID:

199034

URI

https://hrcak.srce.hr/199034

Publication date:

15.7.2017.

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