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An ultra high voltage auto-transformer has been analyzed in this paper. The maximum voltage of this auto-transformer is 750 kilo voltage, and the capacity is 500 millions volt-ampere. This paper primary introduced the calculation and analysis for the main insulating structure of single-phase power auto-transformer. The whole electric field of transformer be calculated by the finite element analysis...
Taking a 380000kVA/500kV large power transformer as an example, in this paper, the eddy current loss generated by leakage magnetic field in transformer tank is calculated by two 3-D finite element methods (FEM) and the factors to affect the computation accuracy of loss are discussed. By adding magnetic shielding to the surface of oil tank, the maximum magnetic flux density and total eddy current loss...
This paper mainly investigates the optimal design of a novel magnet structure of open-type superconducting magnetic resonance imaging (MRI) device. In order to obtain multiple optimization design objectives including high homogeneity in the imaging region, high magnetic field strength as well as low cost, a two-step optimization strategies are carried out, in which orthogonal design (OD) is, firstly,...
Model of electric field of HV lead is set up based on insulation characteristics of ultrahigh voltage power transformer. In this paper, the SFP-400000/500 power transformer is taken as an example and analyzed by ANSYS. The maximum electric intensity and its position are determined, and the distributions of electric field in some planes are shown. The results and especially the insulation of electric...
The eddy losses of coils and spider arms under the harmonic magnetic field for the high voltage dry-type smoothing reactor (HVDTSR) are analyzed in this paper. The expression of coils losses is deduced by using 2-D analytical magnetic field expression and coils losses are calculated by FORTRAN program. The spider arms' losses are simulated with ANSYS software. The losses of coils and spider arms in...
Basic principle and structure of advanced static Var generator is analyzed in this paper, core controller based on TMS320F2812 is designed as well. The fuzzy predictive control algorithm is widely used in industrial production control because of its advantages in model prediction, rolling optimization and feedback correction. The feasibility of fuzzy predictive control in predictive applied to static...
This paper presents a method to simulate the characteristics of permanent magnet materials with a magnetic field varying arbitrarily. Combining Preisach model and finite element analysis, a dynamic magnetic field computation is implemented for a permanent magnet assembly in a process of assembling. The hysteresis characteristic including local loop and rotational magnetization are considered in the...
On the basis of study DC magnetic bias, using 2-dimension transient field-circuit directly coupled finite element method, in virtue of finite element analysis software ANSOFT, quantitatively analyze the influence of DC magnetic bias on excitation current of a converter transformer; On the basis of core loss data, quantitatively analyze the influence of DC magnetic bias on core loss of the converter...
This paper presents a finite element analysis combined with an improved Preisach model to implement the dynamic simulation of permanent magnet assembly under direction-varying high field
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