PROTECTIVE RELAY FOR OIL-FILLED ELECTRICAL EQUIPMENT Russian patent published in 1998 - IPC

FIELD: power engineering; protective gear responding to deviation of nonelectric parameters of oil-filled devices from specified values. SUBSTANCE: relay case accommodates vertical rod mounting top and bottom magnetically controlled contact groups in its hollow, first and second floats with first and second control magnets, and pressure plate with third control magnet. Bottom float is offset relative to rod axis in direction of outlet pipe; control magnet mounted on pressure plate is placed against bottom magnetically controlled contact group. EFFECT: provision for realizing three main functions of relay by means of two contacts to warn about gas accumulation, oil loss, and internal short circuits of electrical equipment. 4 cl, 2 dwg