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The paper proposes an effective time-domain modeling and simulation strategy of power transformers, using the SPICE circuit simulator. The nonlinear phenomena of the iron core are carefully considered, including saturation, static hysteresis and eddy currents. The principle of magnetic circuit modeling is based on analog lumped equivalent circuits and the SPICE implementation uses the principle of...
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,...
The concept of power transformer design with a symmetric core construction (the hexa-transformer) provides a more compact solution compared to traditional technology based on an E-type core. This paper evaluates parameters of two 100 kVA three-phase transformers built according to both concepts. The evaluation includes calculations of induced voltages, inductances, core losses and weight differences...
Current transformers (CT) normally have excellent performance when applied correctly under conditions for which they were designed. While the common operating conditions affecting CT performance are usually recognized and properly considered, there is one factor, the importance of which is sometimes underestimated or even overlooked entirely. This is the effect of external stray flux produced by:...
A superconducting fault current limiter of the transformer type (inductive FCL) based on magnetic coupling between a superconducting element and a protected circuit has been investigated by many authors for various parameters and performances of a superconducting element. Another design of the device preventing high short-circuit currents is a self-limiting transformer combining the functions of a...
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