JP2000018145A - Governor of hydropower plant and method of operating the same - Google Patents

Abstract

(57) [Summary] [Problem] To provide a highly reliable governor of a hydroelectric power plant, in which the operation of a water turbine can be continued even if a failure occurs in an electro-mechanical converter of the governor. A control device for outputting a speed control target as an electric signal, and an electric device for converting the electric signal into a mechanical operation.
In a governor of a hydroelectric power plant comprising a mechanical converter 2 and a hydraulic amplifier 4 for amplifying the output of this electro-mechanical converter, another electric-to-mechanical converter 2 is connected in parallel with the electro-mechanical converter 2.
A mechanical converter 2 'and a failure detecting device 8 for detecting that one of the electro-mechanical converters has failed;
And the control device 1 is provided with a signal correcting means 19 for correcting a control signal based on a fault output signal from the fault detecting device 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a governor of a hydroelectric power plant and a method of operating the governor, and more particularly, to a governor of a hydroelectric power plant formed so as to hydraulically control the guide blades of a water turbine, and a governor thereof. It relates to the driving method.

[0002]

2. Description of the Related Art A governor of a hydroelectric power plant which has been generally employed in the past is usually constituted by a system as shown in FIG. That is, in the drawing, reference numeral 1 denotes a control device for performing the control, and this control device is a device for outputting a control target by an electric signal. The output of the control device is transmitted to the electro-mechanical converter 2 through the electric signal 2a. Is entered.

An electro-mechanical converter 2 is a converter for converting an electric signal into a mechanical operation, and moves a pilot valve 3 directly connected to the electro-mechanical converter 2 upward in the case of an open signal, In the case of the closing signal, move down. For example, when an open-side signal is output from the control device 1, the electric signal 2 a output from the control device 1 is converted into a mechanical operation by the electro-mechanical converter 2 and directly connected to the electro-mechanical converter 2. Move the pilot valve 3 upward.

When the pilot valve 3 moves upward, the pressure oil 6 supplied from a pressure oil tank (not shown) is constantly supplied to the portion 3c of the pilot valve sleeve 3b and the portions 4b and 4c of the hydraulic amplifier 4, so that the pressure of 3c The oil passes through 3a, and the hydraulic oil passes to the 4d portion of the hydraulic amplifier 4.

[0005] When pressure oil flows through the 4d portion of the hydraulic amplifier 4, there is an area difference between the hydraulic amplifier 4b and the hydraulic amplifier 4b.
That is, since the area of the 4d portion is formed large,
The main valve 4e moves upward. When the main valve 4e moves upward, the pressure oil of 4c of the hydraulic amplifier 4 passes through 5a and communicates with the 5c portion of the guide blade servomotor 5 to guide the guide blade servomotor 5.
Is operated to the right (open side) in FIG. On the other hand, the pressure oil of 5d of the guide blade servomotor 5 passes through 5b and is drained from 4f of the hydraulic amplifier 4 so that the guide blade servomotor 5 opens.

When the main valve 4e moves upward, the lever 4a attached to the main valve 4e also moves upward in conjunction with it, so that the pilot valve sleeve 3b also moves upward following the lever 4a by the force of the compression spring 3d. However, if the pilot valve 3 overlaps with the hole through which the pressure oil passes through 3a of the pilot valve sleeve 3b, the pressure oil of 3a will not pass through, so that the main valve 4e is held in position and the guide blade servo motor 5 continues the open side operation. I do.

The position of the guide vane servomotor is detected by a position detector 18 and fed back to the control unit 1 as an electric signal 18a. When the target position is reached, the pilot valve 3 is moved to the main valve 4e by passing hydraulic oil through 5a and 5b. An electric signal is output to move the guide blade to a position where the guide blade is not to be operated, and the operation of the guide vane servomotor 5 stops.

Conversely, when the control device 1 outputs a close signal, the hydraulic oil of 4d of the hydraulic amplifier 4 is drained from 3a through 3e of the pilot valve sleeve 3b, so that the main valve 4e moves down, and The pressure oil at 4c of the amplifier 4 passes through 5b and operates the guide blade servomotor 5 to the left (closed side) in FIG. The pressure oil of 5c of the guide blade servo motor 5 is 5a
And the oil is drained through 4 g of the hydraulic amplifier. Through the above-described series of opening / closing control, the amount of water flowing into a water turbine (not shown) is adjusted to perform the intended power generation.

[0009] On the other hand, the recent power situation demands an improvement in the reliability of hydroelectric power plants. In particular, in pumped storage power plants, hydropower plants can be controlled to target power in a shorter time than thermal and nuclear power plants. It is important for power system stabilization in a short time according to system requirements. For this reason, there is an increasing demand for a redundant control device for the purpose of improving the reliability of equipment.

At present, the control device 1 shown in FIG. 4 is constituted by an electric circuit. That is, the control devices 1a and 1b that perform the same calculation process are provided in the control device 1 and always perform the same calculation. For example, if the control device 1a in FIG. 4 is a normally used control device, the contact 1c is switched to the control device 1a side when 1a is in a normal state, and the electric signal output to the electromechanical converter 2 is output from the control device 1a. ing. If a failure is output from the control device 1a for any reason, the contact 1c is instantaneously switched to the control device 1b. As described above, the control device 1
Since a and 1b always perform the same operation, even if they are switched, no change occurs in the electric signal output 2a to the electro-mechanical converter 2, so that the control can be continued, that is, the operation of the water turbine can be continued.

Japanese Patent Application Laid-Open No. Sho 62-96786 discloses a governor related to a governor of a hydroelectric power plant.

[0012]

In the conventional governor formed as described above, if a failure occurs in the control device, the operation can be continued by switching the control device. -In the case of a mechanical converter failure, there was a problem that it was impossible to continue operation of the water turbine without any means.

SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing, and an object of the present invention is to provide a highly reliable hydroelectric power generation system capable of continuing operation of a water turbine even if a failure occurs in an electro-mechanical converter of a governor. To provide a speed governor for a place.

[0014]

That is, the present invention provides a control device for outputting a speed control target as an electric signal, an electro-mechanical converter for converting the electric signal into a mechanical operation, and this electro-mechanical device. In a governor for a hydroelectric power plant comprising a hydraulic amplifier for amplifying the output of the converter, another electro-mechanical converter is provided in parallel with the electro-mechanical converter, and the To achieve the intended purpose, a failure detection device for detecting that one of the devices has failed is provided, and the control device is provided with signal correction means for correcting a control signal based on a failure output signal from the failure detector. It is like that.

In this case, the failure detecting device for detecting a failure of the electro-mechanical converter includes a detector for detecting an operation amount of the electro-mechanical converter, and the operation amount of the detector is equal to or less than a set value. In such a case, it is determined that a failure has occurred.

Further, a failure detecting device for detecting a failure of the electro-mechanical converter comprises a function generator for calculating an operation amount of the electro-mechanical converter from an output of the control device;
A detector for detecting the operation amount of the mechanical converter, an arithmetic unit for calculating a deviation between the output signal of the detector and the output signal of the function generator, and comparing the output of the arithmetic unit with a set value or more. And a comparator that determines and outputs a failure.

The present invention also provides a control device for outputting a speed control target as an electric signal, an electro-mechanical converter for converting the electric signal into a mechanical operation, and amplifying the output of the electro-mechanical converter. A hydraulic power plant including a hydraulic amplifier, comprising: a hydraulic converter; another electro-mechanical converter provided in parallel with the electro-mechanical converter; and the electro-mechanical converter. A failure detection device that detects that one of the failures has occurred, and a signal correction unit that corrects a control signal of the control device based on a failure output signal from the failure detector. A function generator for calculating an operation amount of the electro-mechanical converter from an output of the device, a detector for detecting an operation amount of the electro-mechanical converter, an output signal of the detector, and an output signal of the function generator Calculate the deviation from And a comparator for comparing the output of the arithmetic unit and judging and outputting a failure when the output is equal to or more than a set value, and a signal correcting means provided in the control device, wherein the output of the failure detection device is Thus, the gain of the output signal of the control device is switched. Further, a hydraulic switching valve that operates simultaneously with the operation of the signal correction means is provided between the electro-mechanical converter and the hydraulic amplifier.

The present invention also provides a control device for outputting a speed control target as an electric signal, an electro-mechanical converter for converting the electric signal into a mechanical operation, and amplifying the output of the electro-mechanical converter. Operating the governor of a hydroelectric power plant comprising a hydraulic amplifier comprising: a further electro-mechanical converter in parallel with the electro-mechanical converter; and In addition to providing a failure detection device for detecting that a failure has occurred, the control device is provided with signal correction means for correcting a control signal based on a failure output signal from the failure detector, and the two electro-mechanical converters are normally operated. In this case, the output is switched to the operating state, and the output of the electromechanical converter on the healthy side is switched by the fault detection and the signal correction means of the control device.

That is, in the governor of the hydroelectric power plant formed as described above, signals are individually input from the control device which always outputs the control target as electric signals by the two electro-mechanical converters and are controlled. . Should one of the electromechanical converters fail, a detector that always detects the amount of operation of the electromechanical converter is provided, so that an insufficient operation is detected. The failure is determined by detecting the output of a function generator that calculates the operation amount of the electro-mechanical converter from the output of the control device that outputs the control target to the failure detector as an electric signal and the operation amount of the electro-mechanical converter. A comparator for calculating a deviation from the signal of the detector to be operated and a comparator for comparing the output of the arithmetic unit and judging a failure when the output is equal to or more than a set value are provided, so that the failure can be determined.

If it is determined that one of the electro-mechanical converters is faulty, a signal correction function provided in a control device for outputting a control target as an electrical signal is used to make the output signal chain sound with the output of the fault detector. Since the number of the electro-mechanical converters can be switched to the operation amount of two electro-mechanical converters, the operation is not disabled and the operation can be continued with one electro-mechanical converter.

Further, no matter where the faulty electro-mechanical converter is located, the faulty electro-mechanical converter is output from the fault detector.
Since the hydraulic switching valve that operates simultaneously with the signal correction function operation is provided between the mechanical converter and the hydraulic amplifier, the hydraulic oil between the electro-mechanical converter and the hydraulic amplifier can be shut off. It is possible.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 systematically shows a schematic configuration of the hydroelectric power plant. The control device 1 is a device that outputs a control target as an electric signal, and the output of the control device is input to the electro-mechanical converters 2 and 2 ′ through the electric signals 2a and 2a ′.

The electro-mechanical converters 2 and 2 'are converters for converting an electric signal into a mechanical operation, and open pilot valves 3 and 3' directly connected to the electro-mechanical converters 2 and 2 '. In the case of a side signal, it is moved up, and in the case of a closed signal, it is moved down. For example, when an open signal is output from the control device 1, the electric signals 2a and 2a 'output from the control device 1 are converted into mechanical operations by the electro-mechanical converters 2 and 2', and the electro-mechanical converter is used. The pilot valves 3 and 3 'directly connected to 2 and 2' are moved upward.

When the pilot valves 3 and 3 'are moved upward, the pressure oil 6 supplied from a pressure oil tank (not shown) is constantly supplied with the portions 3c and 3c' of the pilot valve sleeves 3b and 3b 'and the portions 4b and 4c of the hydraulic amplifier 4. Since the pressure oil of 3c and 3c 'is supplied to the parts, the hydraulic oil of 3a and 3a' and the hydraulic switching valves 9 and 9 ', 9b and 9
It is supplied to the 4d portion of the hydraulic amplifier 4 through b ′.

When the pressure oil passes through the 4d portion of the hydraulic amplifier 4, there is an area difference between the 4d portion and the 4b portion of the hydraulic amplifier 4, that is, since the area of the 4d portion is formed large, the main valve 4e moves up. When the main valve 4e moves upward, the pressure oil of 4c of the hydraulic amplifier 4 passes through 5a to the 5c portion of the guide blade servomotor 5, and
The piston 5e of the guide blade servomotor 5 is operated to the right (open side) in FIG. On the other hand, the pressure oil of 5d of the guide blade servo motor 5 passes through 5b and is drained from 4f of the hydraulic amplifier 4, whereby the guide blade servo motor 5 opens.

When the main valve 4e moves upward, the lever 4a 'attached to the main valve 4e also moves upward in conjunction therewith, so that the pilot valve sleeves 3b and 3b move upward.
The lever 4 is also driven by the force of the compression springs 3d and 3d '.
When the pilot valves 3a and 3a 'overlap with the holes through which the pressurized oil passes through 3a and 3a' of the pilot valve sleeves 3b and 3b ', the pilot valves 3a and 3a move upward.
Since the pressure oil of a 'does not pass, the position of the main valve 4e is maintained, and the guide vane servomotor 5 continues the opening side operation.

The position of the guide vane servomotor is detected by a position detector (not shown) and is fed back to the controller 1 as an electric signal (not shown). When the target position is reached, the pilot valves 3 and 3 'are moved to the main valve 4e by 5a, An electric signal for lowering the position to a position where pressure oil is not passed is output to 5b, and the operation of the guide blade servomotor 5 stops.

Conversely, when the control device 1 outputs a close signal, the hydraulic oil 4d of the hydraulic amplifier 4 is 9b, the hydraulic switching valve 9,
Since the oil is drained from the hydraulic switching valves 9 'and 3a' through the pilot valve sleeves 3e and 3e ', the main valve 4e moves down and the hydraulic amplifier 4
The pressure oil of c passes through 5b, and the guide blade servomotor 5 is moved to the position shown in FIG.
To the left side (closed side). Guide vane servo motor 5
5c passes through 5a and is discharged via 4g of the hydraulic amplifier.

By the above-described series of opening / closing control, the amount of water flowing into a water turbine (not shown) is adjusted to perform desired power generation.
Note that in order to use the electro-mechanical converters 2 and 2 ′,
The pressure oil to 4d of the hydraulic amplifier 4 has a gain of 15 shown in FIG.
Adjust a and 15b.

Conversely, when the control unit 1 outputs a close signal, the hydraulic oil 4d of the hydraulic amplifier 4 is supplied from the hydraulic switching valves 9 and 3a and 9b 'hydraulic switching valves 9' and 3a 'to the pilot valve. 3e and 3 of sleeves 3b and 3b '
Since the oil is discharged through e ', the main valve 4e moves downward, and the pressure oil of 4c of the hydraulic amplifier 4 passes through 5b, and operates the guide blade servomotor 5 to the left side (closed side) in FIG.

The pressure oil of 5c of the guide blade servo motor 5 is
The oil is discharged through 5a and 4g of the hydraulic amplifier. By the above-described series of opening / closing control, it is possible to adjust the amount of water flowing into the water turbine (not shown) and to perform the intended power generation.

Next, a case where the electro-mechanical converter 2 fails will be described. Possible causes of the failure of the electro-mechanical converter 2 include disconnection of the electric signal 2a, failure of the electro-mechanical converter 2 itself, and inability to operate the pilot valve 3 due to tightness. 3 can be detected as a phenomenon that does not follow the command value.

Hereinafter, a failure determination method will be described with reference to FIG. This figure is a drawing showing details of the failure detector 8, and a control target electric signal 2a output from the control device 1 that outputs a control target as an electric signal is input to a function generator 9a.
The function generator 9a generates an electric signal for the control target electric signal 2a.
Since the operation amount of the mechanical converter 2 can be confirmed in advance by a calculated value or a test result, the calculated value or the test result is set.

As a result, the output of the function generator 9a is the operation target amount of the electromechanical converter 2 with respect to the control target electric signal 2a, and the feedback signal of the operation amount detector 7 of the electromechanical converter 2 shown in FIG. 7a can be calculated by the deviation calculator 10a. Since the output of the deviation calculator 10a is an open side deviation or a closed side deviation, it is calculated to an absolute value by an absolute value calculator 11a for facilitating the processing in a comparator 12a described later. The absolute value of the deviation is input to the comparator 12a and becomes equal to or larger than the preset deviation allowable value.
a and 9a are output.

Next, the operation of the signal correction function will be described with reference to FIG. Assuming that the control device 1a is a service side and the control device 1b is a standby device side, the control device 1 has a duplicated control circuit. The auxiliary relay 13a is not operating because there is no signal in the fault output signal 8a. For this reason, the contact 13d of the auxiliary relay 13a is open, 13e and 1
3f is closed.

The output of the control device 1a is input to the gain 15a through the contact 13c, and the gain is adjusted so that the flow rate becomes one half that of a single electro-hydraulic converter. Gain 1
The output of the gain 5a is input to the output of the gain 14a and the addition calculator 16a to be added and calculated.
Since 3d is open, the input signal to the gain 14a is zero and the output of the gain 14a is also zero, which is no problem.

The output of the adder 16a is the contact 1f of the auxiliary relay 13a and the contact 1f of the auxiliary relay 13b.
It passes through 3I and is output as electrical signals 2a and 2a 'to electro-mechanical converters 2 and 2'.

Here, if the electromechanical converter 2 fails for some reason, it is assumed that the output 8
is input to the control device 1, and the auxiliary relay 13a is energized. The operation of the auxiliary relay 13a closes the contact 13d and opens the contact 13e.
a is input, and conversely, the input to the gain 15a becomes zero.

The gain 14a can be adjusted so that the pressure oil to 4d of the hydraulic amplifier 4 becomes the flow rate when one electro-hydraulic converter is used. Therefore, gain 14
The output of "a" passes through the addition calculator 16a, the contact 1c, and the contact 13I of the auxiliary relay 13b, and the electro-mechanical converter 2 '.
The electrical signal 2a 'is output, the electro-mechanical converter 2' operates twice as much as in the case of two electro-mechanical converters, and the hydraulic amplifier 4 is operated before the electro-mechanical converter 2 fails. The control can be continued without change.

The control signal 2a to the failed electro-mechanical converter 2 is supplied to the contact 13f by the activation of the auxiliary relay 13a.
Is opened, so that the electric signal 2a is not output, which also prevents the failure range from expanding. If it is necessary to display that the electro-mechanical converter 2 has failed, this can be easily realized by outputting a contact (not shown) of the auxiliary relay 13a.

Next, since it is not known at which position the electro-mechanical converter 2 fails, the pilot valve 3 must be in the open position, the closed position, or the neutral position in which pressure oil is not allowed to pass through the open / close position. It is not clear whether to stop or operate at the position, and if no action is taken, the control pressure oil to 4d of the hydraulic amplifier 4 which is communicated by the operation of the sound electro-mechanical converter 2 'described above will cause the pilot valve 3 to close. In such a case, if the pilot oil is drained or the pilot valve 3 is open, excessive control pressure oil will act. In order to prevent this, the hydraulic switching valve 9 shown in FIG. 1 is installed between the electro-mechanical converter 2 and the hydraulic amplifier 4d.

The hydraulic switching valve 9 can be electrically switched by a failure output signal 8a from the failure detector 8, and switches to the upper port in the figure when the failure signal 8a is input. The upper port in the figure of the hydraulic switching valve 9 blocks neither the 4d of the hydraulic amplifier 4 nor the pressure oil of the pilot valve sleeve 3a, so that the failed electro-mechanical converter 2 is located at any position. It does not affect the control of the hydraulic amplifier 4.

With the above operation, the reliability of the governor of the hydroelectric power plant can be improved as compared with the prior art. In the above description, the case where the electro-mechanical converter 2 has failed has been described. However, when the electro-mechanical converter 2 ′ has failed, control can be continued by the same operation.

FIG. 5 shows an embodiment in which the above-described embodiment is applied, and similar effects can be obtained. That is, this embodiment is different from FIG. 1 in that the electro-mechanical converters 2 and 2 ′ are arranged in series with one pilot valve 3, and the electrical connection between the electro-mechanical converters 2 and 2 ′ is performed. The point is that clutches 17 and 17 'which are connected and released by a signal are provided.

Similarly, in the case where the electro-mechanical converter 2 fails, two electro-mechanical converters 2 and 2 'will be described.
Is healthy, the clutch 17 is connected to the pilot valve 3 and the clutch 1 on the electro-mechanical converter 2 'side is
Since 7 'is open, the control hydraulic pressure of the hydraulic amplifier 4 to 4d is controlled by the electro-mechanical converter 2.

If the electro-mechanical converter 2 fails for some reason, it is determined that the electro-mechanical converter 2 has failed as described with reference to FIG.
The operation amount detector 7 of the mechanical converter detects the failure, the failure detector 8 determines a failure, and outputs failure outputs 8a and 9a. The control target electric signal of the control device 1 is 2 by the failure output 9a.
The clutch 17 is released and the clutch 17 'is connected by the failure output signal 8a at the same time.

In this case, the signal correction function housed in the control device 1 must be a signal switching function, not shown. The signal switching function has means for recognizing which side of the two electro-mechanical converters is operating, and in the case of a failure of the operating side, a function of switching a signal to the non-operating electro-mechanical converter and switching of the clutch. By providing the function, similarly to FIG. 1, even if one of the electro-mechanical converters fails, the operation of the water turbine can be continued.

As described above, in the governor of the hydroelectric power plant thus formed, two electro-mechanical converters are provided, and one of the two electro-mechanical converters is used. Provide a failure detector to judge that a failure has occurred, provide a signal correction function that operates according to the signal of the failure detector, and provide a hydraulic switching valve that operates according to the signal of the failure detector. Therefore, the reliability of the governor of the hydroelectric power plant can be improved.

[0049]

As described above, according to the present invention, even if a failure occurs in the electromechanical converter of the governor, the operation of the turbine can be continued, and the governing of the hydroelectric power plant with high reliability can be achieved. You can get the machine.

[Brief description of the drawings]

FIG. 1 is a schematic system diagram of a governor of a hydroelectric power plant according to the present invention.

FIG. 2 is a system diagram of a failure detector according to the present invention.

FIG. 3 is a system diagram of a signal correction function according to the present invention.

FIG. 4 is a schematic system diagram of a governor of a conventional hydroelectric power plant.

FIG. 5 is a schematic system diagram to which a governor of a hydroelectric power plant according to the present invention is applied.

[Explanation of symbols]

1 ... Control device, 2,2 '... Electro-mechanical converter, 3,3'
... Pilot valve, 4 ... Hydraulic amplifier, 5 ... Guiding blade servomotor, 6 ... Pressure oil, 7,7 '... Moving amount detector, 8 ...
Failure detector, 9a, 9b ... function generator, 10a, 10b
... Deviation calculators, 11a and 11b ... Absolute value calculators, 12
a, 12b: comparator, 13a, 13b: auxiliary relay, 14
a, 14b: gain, 15a, 15b: gain, 16
a, 16b: addition arithmetic unit, 19: signal correction function (signal correction means).

Claims (6)

[Claims] A control device for outputting a speed control target as an electric signal, and an electric device for converting the electric signal into a mechanical operation.
In a governor of a hydroelectric power plant comprising a mechanical converter and a hydraulic amplifier for amplifying the output of the electro-mechanical converter, another electro-mechanical converter is provided in parallel with the electro-mechanical converter. A failure detection device for detecting that one of the electro-mechanical converters has failed is provided, and the control device is provided with signal correction means for correcting a control signal based on a failure output signal from the failure detector. A governor for a hydroelectric power plant. 2. A failure detection device for detecting a failure of the electro-mechanical converter, comprising a detector for detecting an operation amount of the electro-mechanical converter, wherein a failure occurs when the operation amount of the detector is equal to or less than a set value. 2. The governor of a hydroelectric power plant according to claim 1, wherein: 3. A failure detection device for detecting a failure of the electro-mechanical converter, comprising: a function generator for calculating an operation amount of the electro-mechanical converter from an output of the control device; A detector for detecting the amount of operation, a calculator for calculating a deviation between the output signal of the detector and the output signal of the function generator, and comparing the output of the calculator with a comparator which is determined to be faulty if the output is equal to or greater than a set value. 2. The governor for a hydroelectric power plant according to claim 1, further comprising a comparator for outputting. 4. A control device for outputting a speed control target as an electric signal, and an electric device for converting the electric signal into a mechanical operation.
A governor for a hydroelectric power plant comprising a mechanical converter and a hydraulic amplifier for amplifying an output of the electro-mechanical converter, wherein the governor is provided in parallel with the electro-mechanical converter. One electro-mechanical converter, a fault detecting device for detecting that one of the electro-mechanical converters has failed, and a signal for correcting a control signal of the control device based on a fault output signal from the fault detector. And a correction unit, the failure detection device, a function generator that calculates the operation amount of the electro-mechanical converter from the output of the control device, and a detector that detects the operation amount of the electro-mechanical converter A calculator for calculating a deviation between the output signal of the detector and the output signal of the function generator, and a comparator for comparing the output of the calculator and judging a failure if the value is equal to or greater than a set value and outputting the result. , And provided in the control device Wherein the signal compensating means switches the gain of the output signal of the control device according to the output of the failure detection device. 5. The governor of a hydroelectric power plant according to claim 4, wherein a hydraulic pressure switching valve is provided between said electro-mechanical converter and said hydraulic amplifier, said hydraulic pressure switching valve being operated simultaneously with the operation of said signal correcting means. 6. A control device for outputting a speed control target as an electric signal, and an electric device for converting the electric signal into a mechanical operation.
A method for operating a governor of a hydroelectric power plant comprising a mechanical converter and a hydraulic amplifier for amplifying the output of the electro-mechanical converter, comprising: a further electro-mechanical converter in parallel with the electro-mechanical converter. And a failure detection device for detecting that any of the electro-mechanical converters has failed,
The control device is provided with signal correction means for correcting a control signal based on a failure output signal from the failure detector, and the two electro-mechanical converters are activated from a normal operation, and the failure detection device A method for operating a governor of a hydroelectric power plant, wherein a failure detection and a signal correction means of the control device perform an output improvement switching of a sound side electro-mechanical converter.