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Mechanical characteristics analysis of normal and defective transformer windings with eccentric distance under short-circuit (SC) fault are conducted using three-dimensional finite element method (3-D FEM). The change characteristics of maximum stress and displacement of defective windings with different eccentric distances of high voltage winding are obtained. It is found that the increase of the...
Stator-permanent magnet machines have attracted more and more attention in the past decade due to the advantages of robust structure, high power density, high efficiency, etc. This paper is concerned with the strength analysis of salient rotor for the stator permanent magnet machines (SPMMs) with the influence of rotational speed and rotor temperature. Firstly, the rotor stress conditions were simplified...
Brushless doubly-fed generator (BDFG) has a good application prospect on the wind power generation field. In order to improve the power density, a new type of dual-stator brushless doubly-fed generator (BDFG) with magnetic-barrier rotor is presented in this paper. The overall structure design method and mechanical performance of DSBDFG is put forward and analyzed. In this paper, the stress analysis...
A direct-type lead exit for ultra high voltage (UHV) transformer was designed, and the electric field of the lead exit was calculated and analyzed by using finite element method. Then, its insulation structure was optimized. The stress distribution and displacement of the lead exit under vibration condition were investigated. The reliability of the lead exit was verified by electrical test and vibration...
Due to the special structure and working mode of AC and DC excitation, the vibration of magnetically controlled saturated reactors (MCSRs) is larger than that of the ordinary ones. In order to design an appropriate damping system or vibration isolation system for MCSRs, this paper studies the stress characteristic which is the inherent reason of vibration and noise. The multi-group magnetization and...
The electromagnetic arresting gear is one type aircraft arresting gear. It's electromagnetic force can be adjusted precisely, and it is an important safeguard that it arrests the aircraft veering off the runway and ensures the aircrafts safely landing. Arresting cable is an essential part of arresting gear, and its performance has a significant impact on arresting process. This paper studies the dynamics...
Output voltage of renewable energy resources, such as fuel and solar cells, varies widely with load and environmental condition, so a DC-DC converter should be suitable for wide input-voltage range application and be with low input ripple current. An integrated boost three-phase half-bridge converter is proposed. The boost and three-phase half-bridge converters are integrated to reduce number of switches...
A high gain single stage buck-boost inverter (SSBBI) is proposed in this paper. The proposed topology has low semiconductors count, only four switches. The tapped inductor is applied to attain high gain feature. One-cycle control (OCC) is adopted to control the SSBBI and attain superior source ripple rejection. The paper presents the operation principle of the proposed topology, and the derivation...
To develop a new standard design of gas-insulated bus(GIB), an electromagnetic-structural finite element analysis has been conducted considering the electromagnetic force generated in GIB with a large current. The GIB are electrical bus-bar parts of a gas-insulated switchgear(GIS) installed as a protective device in power plants and substations. Since the electromagnetic forces generated by a large...
To calculate the fatigue life of shield ring following steps untaken: First, obtain the dynamic characteristics by using image recognition method and the finite element method. Second, calculate fatigue life cycle on the basis of the time-domain analysis results of vortex-induced resonance. Third, estimate the fatigue life of shield ring considering the probability of wind speed. Finally, design a...
In this paper, an auxiliary power unit (APU) for railroad car, which is applied a resonant DC/DC converter and a single-switch boost converter with SiC device, is proposed. The proposed circuit adopts SiC device in order to overcome disadvantages of IGBT. Compared to IGBT, since SiC has smaller switching loss, SiC can be operated at higher switching frequency. Therefore, the proposed APU with SiC...
Single-stage buck-boost gird-connected inverter is widely used in distributed generation systems because of low cost and high efficiency. However, shoot-through problem exists, so reliability of the system is reduced. In addition, output voltage of renewable energy resources varies widely with load and environmental condition, so voltage stress of switches is high in wide input-voltage range application...
For high speed permanent magnet machine, it is necessary to meet the requirements including electromagnetic properties, mechanical properties and temperature, so it is a multi-physics field iterative design process. Based on the electromagnetic field, the temperature field, the stress field and the rotor dynamics, a 360kW, 7000r/min high speed permanent magnet machine is analyzed. Through the multi-physics...
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