FIELD: electromechanical engineering; large electrical machines such as turbogenerators. SUBSTANCE: oil is delivered to dashpot of shaft seal oil-supply system from pump through float valve that maintains constant level ΔH. within it. When dashpot is installed above electrical machine at elevation ensuring desired hydrostatic head of oil on shaft seal, oil is supplied to seals at permanently maintained high pressure exceeding that of gas inside electrical machine. In this way, desired oil pressure is automatically maintained and independent stand-by oil supply is provided. EFFECT: improved reliability of electrical machine. 3 cl, 4 dwg
