| 摘要 |
FIELD: engines and pumps. ^ SUBSTANCE: proposed device comprises circuit breaker, magnetic starter, two amplifiers, protective relay, step-down transformer, power supply, water upper and lower level pickups, "dry run" pickup, control relay, three inverters and JK-trigger., Protective relay coil is connected to output of first amplifier. Step-down transformer primary start is connected to circuit breaker output. Power supply is connected to one of step-down transformer secondaries to supply relay, amplifiers and logical elements. Water upper and lower level and "dry run " pickups have their one end connected to grounded start of step-down transformer another secondary. Third inverter is connected in series to output of extra AND circuit. K-trigger output is connected to upper level pickup and first input of AND circuit. J-trigger input is connected to AND circuit second input and second inverter output. Q-trigger output is connected to control relay second amplifier input. ^ EFFECT: reliable outage of downhole drive motor. ^ 1 dwg |
