Insulation Design and Experimental Results for Transmission Class HTS Transformer With Composite Winding

Cheon, Hyeon-Gweon; Kwag, Dong-Soon; Choi, Jung-Mi; Min, Chi-Hyun; Park, T.S.; Kim, H.H.; Kim, S.H.

doi:10.1109/tasc.2008.920837

Cited by 17 publications

(3 citation statements)

References 7 publications

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“…This is the lower bound of a 90% confidence interval of a 0.1% Weibull statistic for a breakdown voltage calculation modified to account for a 21 m total length being represented by the short sample length (figure 7 represents these results expressed as survival probability). The impulse strength is expected to be twice this breakdown voltage (4 kV), in line with findings from Cheon et al [7]. This is considered satisfactory for our electrical design.…”

Section: High Voltage Insulation Performance Testingsupporting

confidence: 89%

“…Experimental results from other research [7] conclude that a single layer of polyimide insulation in liquid nitrogen will break down with a 100 kV mm −1 impulse. It is typical to assume 50% of the measured breakdown strength for impulse design (this value usually approximating the partial discharge inception level).…”

Section: High Voltage Insulation Performance Testingmentioning

confidence: 95%

“…Conventional transformers are more commonly insulated with pressboard and insulation papers. We were guided by the output of prior work [7] when applying G10 to the transformer insulation scheme. The HTS transformer will also employ sub-cooled liquid nitrogen as a dielectric/coolant whereas a conventional transformer uses oil.…”

Section: Electrical Designmentioning

confidence: 99%

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The development of a Roebel cable based 1 MVA HTS transformer

Staines

Glasson

Pannu³

et al. 2011

Supercond. Sci. Technol.

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This paper describes recent experimental results in a continuing program to develop a 1 MVA demonstration transformer that employs HTS Roebel cable for the high current windings. The electrical design parameters of the transformer are presented, including the configuration of the specially developed Roebel cable. This paper discusses estimation of the cable I c from measured I c (B) data for samples of the strands, AC loss minimization using flux diverters, proving the suitability of the polyimide insulation scheme to withstand the effects of a high voltage impulse and modelling and experimental verification of the fault current limiting behaviour expected from the HTS conductor.

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Section: High Voltage Insulation Performance Testingsupporting

confidence: 89%

Section: High Voltage Insulation Performance Testingmentioning

confidence: 95%