Abstract
The problem of preventing corona glowing discharges at the junction of slot and end-winding semiconductive coatings is investigated. Allowable electrical stress and current density are determined and used to calculate the two-step stress-grading coating. The proposed construction of end-winding coatings was used to produce 20-kV turbogenerators and checked by long-term sample testing.
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References
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Hudon, C., Amyot, N., Saad, H., Tremdlay, R., Quality Control Test of External Discharges of Stator Bars, CIGRE Colloqium, Oct. 2007, pp. 56–64.
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Additional information
Original Russian Text © B.D. Vakser, O.P. Pishchulina, 2009, published in Elektrotekhnika, 2009, No. 3, pp. 19–23.
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Vakser, B.D., Pishchulina, O.P. Prevention of marginal corona discharges in the insulation of high-voltage electric machines. Russ. Electr. Engin. 80, 136–138 (2009). https://doi.org/10.3103/S1068371209030043
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DOI: https://doi.org/10.3103/S1068371209030043