Electrical insulation system using ice at cryogenic temperature has been studied. Ice has excellent electrical breakdown strength at cryogenic temperature. However, electrical weak points such as voids or cracks are easily formed in ice. Therefore, we tried to suppress the formation of voids or cracks by mixture of alcohol. In this paper, ac breakdown voltages of ethylene glycol, 1,3‐propanediol, propylene glycol, or glycerin of solidified aqueous solutions were observed. The following results were obtained. (1) In many cases, the ac breakdown voltages of these solidified alcohol aqueous solutions were higher than that of ice. Average breakdown voltage of ethylene glycol shows the highest value among the tested solutions. It is 1.8 times higher than average value of ice. (2) In order to obtain high breakdown properties, it is necessary to adjust alcohol molar fraction so that solidification goes through sherbet‐like matter. (3) ac breakdown voltages of solidified aqueous solutions have very large dispersion. The breakdown voltage of solidified aqueous solution is clarified to be depending on the solidification state. (4) The solidification state of aqueous solution varies with alcohol concentration, cooling rate, and cooling time.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    ac Breakdown Properties and Solidification States of Solidified Alcohol Aqueous Solutions



    Published in:

    Publication date :

    2017




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    53.00 / 53.33 / 52.53 Kraftwerkstechnik / 53.31 / 52.53 / 53.33 Elektrische Maschinen und Antriebe / 53.00 Elektrotechnik: Allgemeines / 53.31 Elektrische Energieübertragung
    Local classification TIB:    770/5600/8000



    Effect of solidification rate on microstructures of directionally solidified superalloy DZ22

    Liu, Z. / Li, J. / Shi, Z. et al. | British Library Online Contents | 1995


    Vibrational sum frequency generation of aqueous solutions of alcohol

    Shan-Shan Ju, / Tzong-Daw Wu, / Yuh-Lin Yeh, et al. | IEEE | 2003


    Vibrational sum frequency generation of aqueous solutions of alcohol

    Ju, S.-S. / Wu, T.-D. / Yeh, Y.-L. et al. | British Library Conference Proceedings | 2003



    Metal Matrix Composites Directionally Solidified

    Ares, Alicia Esther / Schvezov, Carlos Enrique | Wiley | 2015