Article

Numerical analysis on magnetic field of HTS transformer with different geometry

Sch. of Electr. Eng., Huazhong Univ. of Sci. & Technol., Wuhan
IEEE Transactions on Magnetics (impact factor: 1.36). 05/2006; DOI:10.1109/TMAG.2006.870940 pp.1343 - 1346
Source: IEEE Xplore

ABSTRACT In a high-temperature superconducting (HTS) transformer leakage magnetic field, especially its radial component, decreases the critical current and increases the ac losses in the tapes. Because of zero resistance of HTS tapes a slight unbalance among the branch inductances of the windings may result in heavy circulating current, however, an accurate calculation of it must depend on the magnetic field analysis. Thus, a numerical analysis of the leakage magnetic field is especially necessary for an HTS transformer design. In this paper the leakage magnetic field of several transformer geometries is studied by finite element method, and based on it, the circulating current distribution is calculated. Some suggestions for improving the leakage field and circulating current distribution are presented to make HTS transformers more efficient

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    Article: Pulse Shape Improvement in Core-Type High-Voltage Pulse Transformers With Auxiliary Windings
    L.M. Redondo, J.F. Silva, E. Margato
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    ABSTRACT: High-voltage pulsed power technologies are rapidly emerging as a key to efficient and flexible use of electrical power for many industrial applications. One of the most important elements in high-voltage pulse-generating circuit technology is the transformer, generally used to further increase the pulse output voltage level. However, its nonideal behavior has significant influence on the output pulse shape. The most attractive winding configuration for high-voltage, the core-type transformer with primary and secondary on different core legs, is seldom used in pulsed applications, because of its weak magnetic coupling between windings, which would result in a slow-rising output voltage pulse. This paper shows that auxiliary windings, suitably positioned and connected, provide a dramatic improvement in the pulse rise time in core-type high-voltage pulse transformers. The paper derives a mathematical model and uses it to describe the observed behavior of the transformer with auxiliary windings. It discusses experimental results, obtained from a high-voltage test transformer associated with a high-voltage pulse generating circuit, and the simulation results obtained from the numerical evaluation of the developed differential equations implemented in Matlab and taking into account the measured transformer parameters
    IEEE Transactions on Magnetics 06/2007; · 1.36 Impact Factor
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.

Keywords

branch inductances
 
critical current
 
efficient
 
finite element method
 
high-temperature superconducting
 
HTS transformer design
 
HTS transformers
 
leakage field
 
leakage magnetic field
 
magnetic field analysis
 
numerical analysis
 
slight unbalance
 
transformer geometries
 

Xiaosong Li