FIELD: electrical engineering. SUBSTANCE: protective device has semiconducting fabric tape volume conductance wound around main insulation of slot portion of each stator-winding bar at least in one layer with approximately constant degree of overlapping and semiconducting fabric tape of volume conductance wound around main insulation of end portion of each bar at least in one layer ensuring different thickness though its length to optimize voltage characteristic. Mentioned different thickness is ensured due to different degree of overlapping which is continuously or interruptedly reduced towards end of rod. EFFECT: improved uniformity of load on bar and increase service life of winding. 5 cl, 3 dwg
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