Motor Speed and Speed protection circuit of small hydropower stations

FIG, M is a variable speed motor control wicket opening and closing and opening. O electric governor. Front grid, hit the power switch SA A side, toggle switch S is opened; aft

er the grid, SA play and be in the generator side, S is closed, the trip in order to achieve self-protection purposes. When the generator grid, with full load, limit switch off SQi top open, the motor is stopped; when off, when the turbine guide vane opening is zero, the limit switch so: the top open, the motor is stopped. Speed protection. When the generator fails, tripping the circuit breaker QF, its auxiliary contact is closed, the contactor KMz was electric pull, reverse the motor until the limit switch sQz top open, shut down is completed.

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