Impact of high temperature superconductors on pulsed power systems

1989 ◽  
Vol 25 (2) ◽  
pp. 1787-1790 ◽  
Author(s):  
S.K. Singh ◽  
J.H. Murphy ◽  
P.W. Eckels ◽  
C.J. Mole ◽  
A.T. Male ◽  
...  
Keyword(s):  
High Temperature ◽  
Power Systems ◽  
High Temperature Superconductors ◽  
Pulsed Power

Overview of High Temperature Superconductor Machines

2021 ◽  
Vol 4 (4) ◽  
pp. 25-33
Author(s):  
Bruno Douine ◽  
◽  
Hocine Menana ◽  
Kevin Berger ◽  
Jean Lеvеque ◽  
...  
Keyword(s):  
High Temperature ◽  
Power Systems ◽  
High Temperature Superconductor ◽  
High Temperature Superconductors ◽  
Synchronous Machine ◽  
Recent Time ◽  
Operating Principle ◽  
Electrical Machines ◽  
Synchronous Machines ◽  
Ac Losses

Electrical machines are important parts of different power systems. The application of high temperature superconductors (HTS) in electrical machines is very promising due to high transport currents. This paper reviews various topologies of superconducting motors and generators using HTS published in the literature in recent time. It begins with a brief presentation of the HTS material used in electrical machines. The description of AC losses and cryogenic systems is done afterwards. Then we offer a striking description of the various realizations of HTS electrical machines such as half HTS synchronous machines, fully HTS synchronous machine, machines with HTS bulks and stacks. Some of these machines are totally innovative compared to conventional ones and their operating principle is strictly related to the presence of HTS materials.

Glass as dielectric for high temperature power capacitors

2014 ◽  
Vol 1679 ◽  
Author(s):  
Timothy J Patey ◽  
Christoph Schlegel ◽  
Emmanuel Logakis
Keyword(s):  
High Temperature ◽  
Power Systems ◽  
Temperature Limit ◽  
Wide Frequency Range ◽  
Pulsed Power ◽  
Electronic Systems ◽  
Thin Glass ◽  
Fundamental Research ◽  
Dielectric Glass

ABSTRACTModern polypropylene film power capacitors are state of the art for power factor correction and many DC link applications, but their long-term commercial use is limited to temperatures of less than 85°C. The temperature limit is given by the dielectric polypropylene which has a melting point in the range of 140 to 170°C, while glass is much higher. Thus, the temperature limit could potentially be overcome by use of thin, alkali-free glass as dielectric. “Glass capacitors” employing ultra-thin and high purity glass layers are promising devices for high temperature applications in oil, gas, aerospace, hybrid electric vehicles, DC transmission, and pulsed power systems. This includes emerging power electronic systems using silicon carbide switches and diodes.This work analyzes and compares various glasses with a thickness of less than 50 µm by dielectric spectroscopy and elemental analysis. It is demonstrated that glass is attractive as dielectric for a wide frequency range up to 200°C. It argues that the dielectric losses are currently too great for thin glass to be used within a commercial power capacitor.While high temperature prototypes already exist, we demonstrate through our analysis that further developments are required to integrate this promising device into commercial systems. It is seen that even trace amounts of alkali materials can have an impact on losses. These losses must be further reduced through fundamental research into polarization/conduction mechanisms of various glass components.

A study by GC-MS of the decomposition of precursors for the MOCVD of high temperature superconductors

2002 ◽  
Vol 12 (4) ◽  
pp. 85-92
Author(s):  
O. V. Lopaeva ◽  
M. L. Hitchman ◽  
S. H. Shamlian ◽  
D. R. Watson
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors
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