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Core losses of nanocrystalline alloy high frequency transformer (HFT) are calculated by adopting the finite element method with magnetic hysteresis effects considered. A normal Preisach model is used to represent the magnetic hysteresis during the numerical simulation. The normal Preisach model features with simple formulations and easy parameters identification. A dynamic circuit model of laminated...
Zero sequence magnetic flux, generated in transformer core in different operation cases, is forced out of the core including the oil gap and the tank. These off-core flux paths can be represented by inductances in a duality transformation based electrical transformer model. These off-core inductances mainly determine the zero sequence impedance that is vital in analyzing a transformer subjected to...
The suppression and protection of over-voltage in power system, as well as the study of electromagnetic compatibility in power system need to build electromagnetic transient model of the components and equipments. In these components and equipments, the transformers [including power transformers, PT/CT, reactor, etc.] with complex structure as well as frequency-dependent effects in high-frequency,...
In this paper an analytical model of continuously transposed cable (CTC) windings is proposed and short circuit condition in these types of windings is simulated. The proposed model is developed to calculate the current distribution in all strands of CTC windings in faulty and no-fault condition. The model is based on the finite element method (FEM) and takes into account the ??skin effect?? impact...
Contact-less electrical energy transmission system (CEET) becomes more and more attractive for various applications. A coreless detachable transformer used for CEET is investigated in this paper. Equivalent circuit model of detachable transformer was established and analyzed. And the flux distribution of the proposed detachable transformer was attained using finite element method (FEM). The flux simulation...
Contact-less electrical energy transmission system has become more and more attractive in power transmission area these years because there is no direct electrical connection or physical contact between the energy transmission system and the power receiver. This paper presents the function principle of contact-less electrical energy transmission systems and new developments. Equivalent circuit model...
Detachable transformer is an important component of contactless power transmission system. Compared with traditional transmission modes, it has following advantages. There is no contact between supplying equipments and loads, no friction, which brings convenience to maintenance; no noise pollution et al. It can work in any formidable conditions with higher frequency and less volume. This paper offers...
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