An investigation on harmonic level, current & voltage distortion and associated power for three phase four wire distribution system in a USM Electrical & Electronic Engineering Department building

This paper presents the results of the investigation on power quality at Electrical & Electronic Engineering department building in University Science Malaysia for three phase four-wire system. The survey was conducted through out a day during peak and off peak hours. The harmonic level, total harmonic distortion, neutral current and power associated such as power consumption, true power factor and etc. for each line were measured and analyzed. The analysis of data from measured distribution system (TCL:2412 kW, MD:1352 kW, 5000 A) showed that the harmonic level was highest at odd harmonic compared to even harmonic. The results also reveal that power consumption and instantaneous power increased during peak hours. The power factor correction mechanism too was functioning well and approaching unity. One very interesting factor is that the neutral currents and total harmonic distortion were excessive in the line neutral distribution system and would affect the distribution system performance. Ideally, it should be zero.