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A novel on-load tap-changing (OLTC) regulator for electrolytic process is proposed in this paper. The thyristors are used to substitute tap regulating switches. By measuring the voltage and current of power system and the load fluctuation of electrolytic bases, the number of groups of transformerpsilas windings which should turn on or off and the position of tap switches can be obtained. Then according...
A model of multi-winding high-voltage transformer is presented, which takes into account effects of leakage transformer, winding resistance and parasitic capacitance. The modeling method and the parameter determination procedure are applicable to all kinds of transformers. Using an LCR meter, all parameters, except the parasitic capacitance, can be determined from taking port impedance measurements...
The eddy loss of stator windings in synchronous generator was calculated using analysis method and finite-element method, the distributed characteristic of stator windings temperature field was studied. In this paper, the distribution characteristic of eddy current of windings in rectangular slot was analyzed first by using analytical method, and the mathematical representations of eddy current were...
This paper uses multi-conductor transmission line (MTL) to model transformer windings. According to the symmetry of windings, a 2D equivalent finite element model can be set up under ANSYS environment. On the basis, finite element method (FEM) is used to calculate the distributed parameters in transformer windings. In the process of calculation, the skin effect is focused on. The frequency-dependent...
The stator-doubly-fed doubly salient (SDFDS) motor for electric vehicles rotates with constant torque below basic speed, whereas with constant power by weakening flux over basic speed. The EMF of SDFDS motor can be controlled for the constant power control by the flux-weakening in theory as the controllable of flux. But the nonlinear characteristics of SDFDS motor cause the EMF to be anomalous square-wave...
The work presents a study of the quantification of the parameterspsila variation caused by applying interleaving techniques in high-frequency transformers. The paper concerns prediction of the effect of interleaving techniques between different layers (interlayer )and in the same layer (intra-layer). Two coefficients had been obtained to respectively show the variation rule of AC resistance and leakage...
The sealed winding conformance test is often performed during the final acceptance test sequence for industrial motor stator insulation. The stator winding is first completely soaked with water, then receives a 10-minute insulation resistance (IR-io) measurement, followed by a 60-second high potential (hipot) test at 1.15 times rated line-to-line voltage (Vll). A 1-minute insulation resistance (IR-i)...
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