Cryogenic dielectrics and hts power apparatus: research at the university of southampton

Swaffield, D.J.; Lewin, P.L.; Chen, G.; Sykulski, J.K.

doi:10.1109/mei.2006.1705855

Cited by 7 publications

(1 citation statement)

References 26 publications

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“…Cross added capacitors into the secondary winding circuits, that would store energy to compensate for the flux lost in the system [3]; this would be unsuitable for a high power application, in which stored energy must be kept to a minimum. The work reported in this paper focuses on methodologies for minimising flux leakage in a system [4].…”

Section: Optimising Ict Layoutmentioning

confidence: 99%

An Investigation into the Next Generation of High Density, Ultra High Voltage, Power Supplies

Frost

Pilgrim

Lewin

et al. 2018

2018 IEEE International Power Modulator and High Voltage Conference (IPMHVC)

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This paper details an investigation into possible technologies suitable for a DC power supply that is comparable in size and voltage output to a Cockcroft Walton Generator, but can produce much greater currents and stores only a fraction of the energy. Early work suggested that the most suitable technologies were those based on conventional transformers, specifically Insulated Core Transformers (ICTs) and High Frequency Cascade Transformers (HFCTs); both of which were investigated further. Different methods have been used to calculate the flux loss in an ICT and ways of reducing these losses investigated. It is concluded that the flux loss of an ICT is too great for use in a practical, high power density, power supply, and that future work in this field should focus on an HFCT based design.

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Section: Optimising Ict Layoutmentioning

confidence: 99%

An Investigation into the Next Generation of High Density, Ultra High Voltage, Power Supplies

Frost

Pilgrim

Lewin

et al. 2018

2018 IEEE International Power Modulator and High Voltage Conference (IPMHVC)

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Electrical Tree Aging of Epoxy-Based Nanocomposites at Cryogenic Temperature

Wang

Huang

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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Electrical insulation at cryogenic temperatures is a key technology in the development of superconducting cables and superconducting current limiters. Due to their improved electrical, mechanical and thermal properties, the application of epoxy nanocomposites in high voltage power systems has shown a broad outlook. In this paper, tests were conducted to investigate the electrical tree aging phenomenon in epoxy resin/Al2O3 nanocomposites in liquid nitrogen under AC voltages. The test samples were prepared with six levels of nanofiller content: 0 wt %, 1 wt %, 2 wt %, 3 wt %, 4 wt %, and 5 wt % by weight ratio. Experimental results showed that nano-fillers below 3% are easy to cause the electric field distortion at the needle tip, which reduces the tree inception voltage in the composite sample compared to that in the neat epoxy sample. At low temperature, the effect of electric field distortion on the tree inception voltage is significantly weakened and the tree growth rate decreases sharply with the increase of the content of the nano-filler.

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