AN ELECTROHYDRAULIC SPEED GOVERNING OR CONTROLLING SYSTEM FOR TURBO GENERATORS OR TURBO ALTERNATORS

摘要

An electro-hydraulic system for governing or controlling the speed of a turbo-generator or turbo-alternator comprising a combination of an electric transducer drivingly connected to the shaft of the turbine for sensing the speed of the said shaft a speed measuring unit connected in series with the electric transducer for producing an output only when there is an error or variation from the predetermined speed of the turbine shaft, a phase advance unit connected in series with the speed measuring unit for producing an output voltage which is a derivative function of the error signal or voltage produced by the speed measuring unit, a summing amplifier connected through a dead band unit and a droop set unit to the phase advance unit, for receiving a first input from the output of the speed measuring unit modified by the said dead band unit and the said droop set unit, a second input from a dither oscillator and a third input from a load set point unit, one or more electrical actuators connected to the output side of the measurement summing amplifier and a hydraulic system connected to the said actuator or actuators on one side and the steam inlet valve of the turbine on the other side and adapted to be actuated for effecting opening or closure of the said steam inlet valve.