METHOD FOR REPLENISHING OIL-FILLED BUSHINGS OF HIGH-VOLTAGE APPARATUSES, PRIMARILY, TRANSFORMERS Russian patent published in 1997 - IPC

FIELD: power engineering; oil conditioning devices for replenishing apparatuses, primarily transformers, without dismounting the equipment and disconnecting transformer from supply mains. SUBSTANCE: oil is fed to vacuum space continuously in steps until it is filled up, sample is taken and subjected to analysis; in case of positive results, bushings are replenished with oil, and oil sample is also taken. Device has pump 8, valves 10, T-piece 18, all connected by means of pipes to inner space of bushing 14; oil tank 1 whose interior is divided into two compartments by means of floating piston 2 whose top surface carries fastening member for its fixation in upper position of space and top end surface of space is made as cover carrying fastening member for piston; bottom end surface is oil-tight base mounting injector 7, pump 8, check valve 1, and valve 10; made in base is through channel 11 communicating with space under piston though check valve with pump; second check valve 18 is mounted on open end of channel; pump is made in the form of hand-operated piston pump whose spaces under piston accommodate admission and delivery valves connected to pipings; delivery piping carries at its end tip 16 joined with inner space of check valve 17 of oil-tight base and with similar space of valve of T-piece 18 mounted on bushing. EFFECT: facilitated replenishing procedure. 2 cl, 3 dwg