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US 4,475,865 AGranted
Apparatus for controlling the operation of a water turbine or a pump turbine and a method thereof
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorsKaneo Sugishita, Katsuyuki Kawahara
Life of this patent
Estimating the term…
Abstract
An increment speed per unit time from the detected rotation speed of a water turbine or a pump turbine with an inlet valve is compared with a prescribed increment to deliver a close order to the inlet valve, when the increment becomes greater than the prescribed increment, for closing the inlet valve to a prescribed opening. Then, a fully open order to the inlet valve is delivered under the condition that neither an emergency shutdown order nor a quick shutdown order is issued to the water turbine or the pump turbine, when a speed governor performs a normal operation.
Claims18
An apparatus for controlling the operation of a water turbine or a pump turbine equipped with an inlet valve, and guide vanes adapted to be opened and closed under control of a speed governor, comprising:
- (1) means for detecting a rotation speed of the water turbine or the pump turbine during a power generation operation;
- (2) a load rejection control device including;
- (a) a load rejection detector connected to receive the rotation speed for comparing the rotation speed of the water turbine or the pump turbine with a first prescribed value and for producing a load rejection signal when the rotation speed of the water turbine or the pump turbine becomes greater than said first prescribed value,
- (b) a governor state detector for receiving an input signal and for judging whether or not said speed governor performs a normal operation based on said input signal to produce a judgement signal when the speed governor is judged as being normal,
- (c) an inlet value open order device connected to receive said judgement signal for producing an output signal when neither an emergency shutdown order nor a quick shutdown order is issued,
- (d) an inlet valve close order device connected to receive the load rejection signal and connected to receive said output signal for producing an inlet valve close order based on the load rejection signal and said output signal, and
- (3) an inlet valve control device connected to receive the inlet valve close order and connected to receive said output signal of the inlet valve open order device for producing a control signal, to close the inlet valve to a prescribed opening when said inlet valve close order is received and for producing a control signal to open the inlet valve to a maximum opening when said output signal is received.
4 more elements
An apparatus for controlling the operation of a water turbine or a pump turbine equipped with an inlet valve, and guide vanes adapted to be opened and closed under control of a speed governor, comprising:
- (1) means for detecting a rotation speed of the water turbine or the pump turbine during a power generation operation;
- (2) a load rejection control device including
- (a) a load rejection detector connected to receive the rotation speed for determining an increment speed per unit time from said detected rotation speed of the water turbine or the pump turbine and for comparing said increment with a prescribed increment and for producing a load rejection signal when the increment becomes greater than the prescribed increment,
- (b) a governor state detector for receiving an input signal and for judging whether or not a speed governor performs a normal operation based on said input signal to produce a judgement signal when the speed governor is judged as being normal,
- (c) an inlet valve open order device connected to receive said judgement signal for producing an input signal when neither an emergency shutdown order nor a quick shutdown order is issued,
- (d) an inlet valve close order device connected to receive the load rejection signal and connected to receive said output signal for producing an inlet valve close order based on the load rejection signal and said output signal,
- (3) an inlet valve control device connected to receive an inlet valve close order and connected to receive said output signal of the inlet valve open order device for producing a control signal to close the inlet valve to a prescribed opening when said inlet valve close order is received and for producing a control signal to open the inlet valve to a maximum opening when said output signal is received.
4 more elements
An apparatus according to 1 or 4, in which said governor state detector includes:
- (a) a rotation speed comparator for receiving said rotation speed for comparing the rotation speed with a prescribed value for producing a first comparison signal when said rotation speed becomes smaller than a prescribed value;
- (b) a guide vane opening comparator for receiving the opening signal of the guide vanes for comparing the opening of the guide vanes with a prescribed opening of the guide vanes and for producing a second comparison signal when said opening becomes smaller than the prescribed opening;
- and
- (c) an OR gate connected to receive the first and second comparison signals for producing said judgement signal.
1 more element
An apparatus for controlling the operation of a water turbine or a pump turbine equipped with an inlet valve, and guide vanes adapted to be opened and closed under control of a speed governor comprising:
- (1) means for detecting a rotation speed of a water turbine or the pump turbine during the power generation operation
- (2) a load rejection control device including
- (a) a load rejection detector connected to receive the rotation speed for comparing the rotation speed of the water turbine or the pump turbine with a prescribed value and for producing a load rejection signal when the rotation speed of the water turbine or the pump turbine becomes greater than the prescribed value,
- (b) timer means connected to receive said load rejection signal and connected to receive a signal showing that the inlet valve is closed, and set by said load rejection signal for producing a timer output signal a predetermined time after the timer means is set, and reset by said signal,
- (c) an inlet valve open order device connected to receive said timer output signal for producing an output signal when neither an emergency shutdown order or a quick shutdown order is issued
- (d) an inlet valve close order device connected to receive the load rejection signal and connected to receive said output signal for producing an inlet valve close order based on the load rejection signal and said output signal;
- (3) an inlet valve control device connected to receive the inlet valve close order and connected to receive said output signal of the inlet valve open order device for producing a control signal, to close the inlet valve to a prescribed opening when said inlet valve close order is received and for producing a control signal to open the inlet valve to a maximum opening when said output signal is received.
4 more elements
An apparatus for controlling the operation of water turbine or a pump turbine equipped with an inlet valve, and guide vanes adapted to be opened and closed under control of a speed governor comprising
- (1) means for detecting a rotation speed of the water turbine or the pump turbine during the power generation operation
- (2) a load rejection control device including
- (a) a load rejection detector connected to receive the rotation speed for determining an increment speed per unit time from the detector rotation speed of the water turbine or the pump turbine and for comparing said increment with a prescribed increment and for producing a load rejection signal when the increment becomes greater than the prescribed increment,
- (b) timer means connected to receive said load rejection signal and connected to receive a signal showing that the inlet valve is closed, and set by a load rejection signal for producing a timer output signal a predetermined time after the timer means is set, and reset by said signal,
- (c) an inlet valve open order device connected to receive said timer output signal for producing an output signal when neither an emergency shutdown order nor a quick shutdown order is issued, and
- (d) an inlet valve close order device connected to receive the load rejection signal and connected to receive said output signal for producing an inlet valve close order based on the load rejection signal and said output signal,
- (3) an inlet valve control device connected to receive the inlet valve close order and connected to receive said output signal of the inlet valve open order device for producing a control signal, to close the inlet valve to a prescribed opening when said inlet valve close order is received and for producing a control signal to open the inlet valve to a maximum opening when said output signal is received.
4 more elements
Dependencies are inferred from the claim text.