Abstract
The Scott transformer is widely used in electric railway systems when there are two unbalanced single-phase loads as this transformer can reduce unbalance currents. This paper investigates whether or not the Scott transformer can also reduce harmonic current. Our study shows that it can reduce the harmonic current when single-phase loads have identical harmonic characteristics. This harmonic reduction occurs through the cancellation of harmonic currents of single-phase loads in the transformer windings. Our studies also show that there is some degree of cancelation even when the loads do not have identical harmonic characteristics. The cancellation depends on load balance factor and harmonic order.
Highlights
Supplying electrical traction loads presents some power quality challenges to power system
The results showed that the Scott transformer reduces the injected harmonic currents into the system by cancelling out the harmonic currents generated by single-phase harmonic loads
We investigate the impact of the Scott transformer on the harmonic current measured in the power system
Summary
Supplying electrical traction loads presents some power quality challenges to power system. If two loads are equal, the Scott transformer presents them as one balanced three-phase load to the three-phase supply system In reality, these two single-phase loads are rarely equal and the transformer still draws unbalanced power from the system. These two single-phase loads are rarely equal and the transformer still draws unbalanced power from the system In this case, the degree of unbalance is, at least, reduced in comparison with the case in which loads are directly connected the system. The results showed that the Scott transformer reduces the injected harmonic currents into the system by cancelling out the harmonic currents generated by single-phase harmonic loads.
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