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This paper proposed an improved thermal-circuit model for power transformer hot-spot temperature prediction with dynamic loading. The influences of solar radiation and the environmental temperature on the heat dissipation were also considered. When calculating the heat dissipation from the transformer tank to surroundings, the average oil temperature was selected as the node value in the thermal circuit...
Shorted compensating windings or non-uniform conductive shield can be used in a selectively passive compulsator to compensate the field produced by the armature winding, thus to reduce the impedance and increase the amplitude of the output current. The compensating effect on the inductance of the armature winding changes while the rotor rotates, so it is possible for selective compensation to output...
There are two kinds of harmonic sources in power system, i.e., voltage-type harmonic source and current-type harmonic source, in the paper the physical essential of the two kinds of harmonic sources is firstly analyzed by simulation. And then a novel series active power filter is proposed when the load is voltage type harmonic source. The novel series active power filter is from the active power filter...
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