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The computation of circulating currents between parallel conductors is a difficult problem in reactor and transformer design. A direct field-circuit coupling FEM model has been established to analyze the magnetic field of air core power reactor. And the circulating current losses has been calculated based on the magnetic field distribution.
Any failures in these equipments directly reduce network reliability and increase maintenance costs. Consequently, the preventive maintenance techniques are increasingly developed. In this regard, frequency response analysis is an appropriate method in order to diagnose any change which occurs in transformer physical construction. This contribution has been concentrated on fault diagnosis by use of...
1000kV/1000MVA UHV the scene of the transformer no-load test for the first time at home and abroad, in particular test voltage of 380V, Measuring mA current level, the corresponding test technology research is very difficult. In addition the transformer core remanence of the impact test results, effectively to demagnetizating UHV transformers is the key to the trial. In this study, using the method...
A power transformer operating in electric network is supplied by voltage source. When analyzing leakage flux and magnetic forces of the power transformer applied to windings, the field-circuit coupled 3D finite element method is needed because of the drawbacks of magnetic dipole model and 2D finite element method. The models were used for simulating and analyzing leakage flux and magnetic forces data...
Two experimental high temperature superconducting transformers has been designed and built using Bi2223 HTS tape. The transformers are unique in that the magnetic circuit is comprised of air and a silicon steel partial core. The first transformer failed during a full load endurance run and an investigation was carried out to determine the cause of the failure. The cause was believed to be from operating...
Details regarding performance can be obtained by detecting the important parameters of transformer. One of the important parameters of transformer is the capacity. The transformer load can be adjusted in time according to the real capacity. Off-line measures are mainly taken in power industry, however, these methods have many disadvantages. In this study, we proposed an on-line capacity detection...
As the power transformer has been to the direction of high voltage and large capacity. Therefore, the calculation of major insulation and longitudinal insulation has been played a more and more important role in transformer design. Use the simplified equivalent circuit as the calculated model. The calculation software for wave process of power transformer winding is developed with Matlab language...
Two kinds of different arrangements on harmonic-suppressed winding with LC filters is studied in this paper, based on the principle of CRT with simplex control winding. According to the analysis of Equivalent circuit of three-winding transformer, the effect of harmonic-suppressed is optimum when harmonic-suppressed winding is placed between control winding and work winding.The Simulation model of...
In the process of determining and investigating the reasonable operation mode of transformer, how to consider reliability and economic operation of transformer is a very important and necessary work. This dissertation chiefly studies the topic of accounting reliability and economic operation of transformer. Economy and reliability are the most two important index of Power System, but also contradictory...
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