Research Output
Effects of Appliances to Voltage, Current, Power Factor and Harmonic Distortion
Flux density and power loss distribution in 100kVA Distribution Transformer core assembled with different cutting angle of T-joint
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Publication
Power utility always get blame if there are power interruption occurred in residential areas. Many
of the residential customers are unaware, that is electrical appliance itself one of the reason that
contribute to power quality problem. Effects of appliances a/so can harm other sensitive equipment
as we/las electrical distribution system. This paper studies the effects of the appliances to power
quality. Appliances that are used in the study are personal computer, fluorescent light, iron, LCD
monitor, motor & driver, television, hand drill, laptop and jig saw. Waveform of the phase voltage
and current, power components, and distortion of voltage and current for all appliances have been
recorded and analyzed using Reliable Power Meter. In this paper concepts of power factor and
effects of harmonics are reviewed. Subsequently voltage and current waveform, voltage total
harmonic distortion, current total harmonic distortion and power factor are analyzed and discussed.
Publication
The power losses occurring under magnetising condition have received a great deal of attention for a long time. The transformer designs with Butt Lap joint cause the highest power loss at the T-joint. These due to the flux need to rotate 90º into the hard direction and transfer up and down to the adjacent layers causes high rotational power loss occurred at the T-joint. To overcome this problem, the different cutting angle such as 23º, 45 º and 60º at the T-joint was introduces in order to find out the most efficient design. The development of the 100kVA Distribution Transformer model core with the four difference types of the T-joint for the power loss and building factor measurement has been tested in order to find which T-joint has minimum power loss and better building factor. The localised flux density was measured using the search coil in order to find out their distribution at the corner joint and T-joint. The fundamental, third and fifth harmonic in the normal and inplane flux density were measured at the corner joint and T-joint. The localised power loss was measured using the thermistor at the similar location of the search coil. The results show that the minimum power loss, better building factor, the minimum fundamental, third and fifth harmonic the normal and inplane flux density and also minimum localised power loss are occurred at the transformer model core assembled with the 60° T-joint.