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In recent decades the theoretical and experimental study of transient phenomena regarding power transformers has experienced a great development. Results of these studies allowed the elucidation of the main theoretical and practical aspects of the transient phenomena due to propagation of impulse voltages inside the transformers. These studies increased the safe operation of power transformer and...
The use of few terminal capacitance measurements at selected high and low frequencies can help in determining the location and extent of deformation in a transformer winding. A deformation coefficient derived from the measurements is used for this purpose. The mathematical basis and characteristics of the coefficient are elaborated. The method is tested for detecting radial and axial deformations...
This paper takes a three phase dry-type reactor with series magnet core for example. The wave process of reactor winding was computed and analyzed under the circumstances of applying lightning impulse voltage to single-phase, the insulation of Inter-phase and layer was determined by potential gradient between reactor units. The difference of the computation method between reactor and power transformer...
This paper takes a three phase dry-type reactor with series magnet core for example. The wave process of reactor winding was computed and analyzed under the circumstances of applying lightning impulse voltage to single-phase, the insulation of Inter-phase and layer was determined by potential gradient between reactor units. The difference of the computation method between reactor and power transformer...
The short circuit test is a special test for proving the mechanical integrity of a power transformer. Conventionally a change in reactance exceeding 2% after the test is an indication of failure. Concurrent high frequency excitation is shown to be more sensitive method for detecting winding deformation. A dasiabenchmarkpsila layer winding is used to validate the use of high frequency excitation. Axial...
During the development of a high power DC-DC converter for a fuel cell vehicle (FCV), we found that the current spikes through the switch devices are too high to gain the high power. On the compact demand of the FCV, the only way is to alter the parameters of components inside the box. The distributed capacitance and inductance of the transformer were adjusted by changing the winding way, the current...
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