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According to service rules the number of coil's windings of power transformer is adjusted to obtain the normal voltage value on consumer side. Usually it is required in winter time, when load power is growing. The turns ratio declining leads to the rise of the voltages on the transformer second winding and on the consumer's distribution bus. The paper main goal is to show that sometimes it is desirable...
A novel scheme based on generalized leakage inductance (GLI) to distinguish the inrush current from the internal fault current in the power transformer is proposed. By eliminating the mutual flux linkage in the transformer loop equation and adopting the trapezoid principle, the GLI is calculated in the real time. According to the difference between the GLI and the leakage inductance obtained from...
Power transformers in their normal lifetime span often encounter unbalanced loads or even DC bias currents that shift the normal operational point of the unit. The influence of a delta connected winding on the magnetizing current waveform of a power transformer will be presented here in more detail. The behavior of an active part is modeled using the system of nonlinear equations solved iteratively,...
This paper proposed a model of contactless power transfer system (CPTS), which adopted a transformer with big air-gap and long primary wires. The system has the characters of long leakage inductance, small magnetizing inductance and low coupling coefficient. It makes the transmission efficiency very low, this model improved system efficiency by adopting resonance of compensation capacitance and leakage...
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