Practical imperfections which can result in unbalances are: A three-phase equipment such as induction motor with unbalance in its windings. If the reactance of three phases is not same, it will result in varying current flowing in three phases and give out system unbalance. With continuous operation, motor’s physical environment cause degradation of rotor and […]
Author Archives: Bertie Bezuidenhout
In recent times, I have attended several seminars and that makes me wonder whether the entire process of Solar Energy Systems installation has anything to do with Electrical Engineering, or is it perhaps closer to something like tree cutting where there are so many claiming to be “experts” in that field. Almost daily, we receive […]
In a balanced three-phase network, the magnitudes of the voltages and currents in all three phases are the same and these voltages and currents phase are shifted symmetrically by 120 degrees to each other. If the magnitudes are not the same and phase-shifts are different from the 120 degrees, the network is unbalanced. Eskom strive […]
Some noises have started to arise that unannounced inspections of rooftop solar panel installations need to be conducted to counteract heightened work health and safety risks as demand soars. With the surge in demand and the appearance of fly-by-night installers, this may have some merits. Businesses that sell, design, and install solar systems have a […]
When switchgear is poorly maintained and operated continuously, it is only a matter of time before something significant occurs. However, if these extreme events go unnoticed, the consequences can be long-lasting. During load-shedding, circuit-breakers should be opened when load-shedding starts and closed when load-shedding ends. Unfortunately, the contacts of these circuit-breakers are often concealed. As […]
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