JPH05312689A - Turbine monitor - Google Patents

Abstract

PURPOSE:To check whether an oscillating circuit board correctly operates without erroneously operating each alarm circuit. CONSTITUTION:When functions of an oscillating circuit board 4 are to be checked, each switch relay 10, 11, 12 is selectively operated to perform treatment wherein an output from the oscillating circuit board 4 is not input to a low output alarm device 5 by C contacts 10b, 12b, 10c, 12c, a MOS transistor 24 and a transistor switch 17 or treatment for cutting an alarm power source of a large oscillation alarm device 6 while C contacts 10a, 11a, 12a are used to cut a signal from an oscillation detector 1 to input a signal preset in the oscillating circuit board 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbine monitoring device for monitoring vibration of a turbine generator and detecting an abnormal condition when it occurs.

[0002]

2. Description of the Related Art A turbine generator generates electric power by rotating a turbine at high speed with steam and rotating a generator connected to the turbine.

In this case, when the rotational speed of the turbine is increased to a high speed (rated rotation), first, an operation called turning is performed to rotate the turbine rotor at a low speed to temporarily bend the turbine rotor (amount of eccentricity). After reducing the value, the rotation speed of the turbine rotor is increased to the rated rotation while monitoring the vibration of the turbine rotor and gradually increasing the rotation of the turbine rotor while monitoring the acceleration.

In this process, when the vibration of the turbine rotor becomes large and becomes larger than a preset value (alarm point), the turbine monitoring device detects this and issues an alarm, and the turbine generator. Ensuring safe driving.

FIG. 8 is a block diagram showing an example of a turbine monitoring device for monitoring the vibration of such a turbine generator.

The turbine monitoring apparatus shown in this figure includes a vibration detector 101, a vibration circuit board 102, a low output alarm circuit 103, a recorder 104, and a large vibration alarm circuit 10.
5, the vibration detector 101 detects the vibration of the turbine rotor, the vibration circuit board 102 processes the detection result, and the processing result is processed by the low output alarm circuit 103, the recorder 104, and the large vibration alarm. Circuit 105
When the vibration of the turbine rotor becomes small while the vibration state of the turbine rotor is measured and the measurement result is recorded in the recorder 104, the low output warning circuit 10
3 generates an alarm signal indicating that the vibration detector 101 has broken, and notifies this, and when the vibration of the turbine rotor becomes large and exceeds the alarm point, this is detected by the large vibration alarm circuit 105. A warning signal indicating that the vibration of the turbine rotor has increased is generated and notified.

The vibration detector 101 comprises a vibration detecting coil 106 attached to the turbine and a resistance 107 for adjusting an output signal. The vibration detector 101 generates a vibration detecting signal corresponding to the vibration of the turbine rotor and vibrates the vibration detecting signal. Supply to the circuit board 102.

The vibration circuit board 102 includes a vibration component extraction circuit 108, an integration circuit 109, and an amplification circuit 110.
Disconnection detection circuit 111, diode 112, V /
And an I conversion circuit 113, and the vibration detector 10
1 takes in the vibration detection signal and extracts the vibration component (AC component), then integrates the vibration component to generate a displacement signal, which is generated by the low output warning circuit 103 and the large vibration warning circuit 105. And the displacement signal is converted into a 4-20 mA transmission signal by the V / I conversion circuit 113 and is supplied to the recorder 104.

The vibration component extraction circuit 108 includes one operational amplifier 114 for amplifying the vibration detection signal output from the vibration detector 101, two resistors 115 and 116 for determining the amplification factor of the operational amplifier 114, and the above-mentioned operation. Amplifier 11
4 has a single capacitor 117 that cuts the DC component of the vibration detection signal output from No. 4 and extracts only the vibration component (AC component), and acquires the vibration detection signal output from the vibration detector 101. After amplifying this, the direct current component is cut to extract the vibration component (AC component) and this is supplied to the integration circuit 109.

The integration circuit 109 is the vibration component extraction circuit 1
08 for inputting the vibration component signal output from 08, and one capacitor 122 connected in parallel
And an integral constant circuit 123 composed of one resistor 121, and the integral constant circuit 123 and the resistor 11
One operational amplifier 120 for integrating the vibration component signal guided by the resistor 119 with the integral characteristic determined by 9.
And an integration constant circuit 123 and the resistor 1
The vibration component signal guided by the resistor 119 is integrated with an integration characteristic determined by 19 to generate a displacement signal indicating the displacement of the turbine rotor, and the displacement signal is supplied to the amplification circuit 110.

The amplifier circuit 110 takes in the displacement signal output from the integration circuit 109, amplifies the displacement signal with a preset amplification factor, outputs it from the output terminal, and supplies it to the large vibration alarm circuit 105. It is supplied to the cathode of 112 and the V / I conversion circuit 113.

The disconnection detection circuit 111 outputs a voltage higher than the negative voltage due to a voltage drop when the coil 106 and the resistor 107 of the vibration detector 101 are not disconnected by the negative voltage obtained by the negative power supply line 131. The resistor 125 to generate, the resistor 126 that takes in the voltage obtained by the resistor 125, the transistor 127 that is turned on / off by the voltage taken by the resistor 126, and the positive voltage obtained by the positive voltage line 132 A resistor 128 that supplies a drive current to the transistor 127, a resistor 129 that takes in the collector voltage of the transistor 127, and a transistor that is turned on when the transistor 127 is turned off via the resistor 129 to bring the collector to the ground voltage. 130 and the negative electric When one end of the vibration detector 101 is pulled down to a negative voltage by the negative voltage obtained by the line 131 and the coil 106 or the resistor 107 of the vibration detector 101 is disconnected, the transistor 127 is turned off and the transistor 130 is turned on. Let the amplification circuit 110
The output terminal of is set to the ground voltage so that the displacement signal is not output from the amplifier circuit 110.

Further, the diode 112 receives the displacement signal output from the amplifier circuit 110 by the cathode and when this is a zero voltage, that is, the disconnection detection circuit 1
When the disconnection is detected by 11, the conductive state is established and the "0" signal is supplied to the low output alarm circuit 103.

The V / I conversion circuit 113 takes in the displacement signal (voltage signal) output from the amplifier circuit 110, converts it into a transmission signal (current signal) of 4-20 mA, and supplies this to the recorder 104. To do.

The low output warning circuit 103 has a judging circuit for judging whether or not the value of the displacement signal output via the diode 112 of the vibration circuit board 102 is smaller than a preset value. When the value of the displacement signal output from the vibration circuit board 102 is smaller than a preset value, it is always determined that the coil 106 or the like of the vibration detector 101 in a severe environment such as a slight vibration is broken. To generate an alarm signal to notify the operator or the like.

The recorder 104 is equipped with a recording mechanism that takes in the transmission signal output from the V / I conversion circuit 113 of the vibration circuit board 102 and records it on recording paper or in a memory. 10
The transmission signal output from the V / I conversion circuit 113 of No. 2 is taken in and recorded on the recording paper or in the memory.

The large vibration alarm circuit 105 has a judgment circuit for judging whether or not the value of the displacement signal output from the vibration circuit board 102 is larger than a preset alarm point. When the value of the displacement signal output from the motor is larger than a preset alarm point, it is determined that the vibration of the turbine rotor monitored by the vibration detector 101 is too large, and an alarm signal is generated. This is notified to the operator etc.

The vibration detector 1 constantly checks whether or not the coil 106 and the resistor 107 of the vibration detector 101 are disconnected by the disconnection detection circuit 111.
The vibration of the turbine rotor is detected by 01, the vibration detection signal obtained by this detection operation is amplified by the vibration component extraction circuit 108, and then the DC component is cut to extract the vibration component (AC component), and the integration circuit 109 Integrate the vibration component signal to generate a displacement signal indicating the displacement of the turbine rotor, and supply the displacement signal to the large vibration alarm circuit 105 to determine whether the displacement of the turbine rotor exceeds the alarm point. , V / I conversion circuit 113 converts the displacement signal into a transmission signal and records it on the recorder 104.

The coil 1 of the vibration detector 101
When either 06 or the resistor 107 is disconnected, the disconnection detection circuit 111 detects it and detects the disconnection by the integration circuit 109.
The value of the displacement signal output from the amplifier circuit 110 and amplified by the amplifier circuit 110 is set to zero, and the low output alarm circuit 103 outputs an alarm indicating that a disconnection accident has occurred in the vibration detector 101 to notify the operator or the like.

[0020]

By the way, in such a turbine monitoring device, in addition to the above-mentioned various functions, for example, the vibration circuit board 102 and the recorder 10 are provided.
Whether the vibrating circuit board 104 functions normally by adding a check function for checking the function of 4.
Turbine monitoring devices have been developed to check if the recorder 104 is operating properly.

In this case, in the conventional turbine monitoring device having such a check function, when the vibration circuit board 102 is checked, the switching relay provided in the input portion of the vibration circuit board 102 is switched to change the vibration circuit board. The input of 102 is short-circuited, or the vibration signal having the maximum amplitude of "1/2" is input to the vibration circuit board 102 or the recorder 10.
I try to check whether 4th etc. work normally.

However, in such a method, when the switching relay is switched, the contact of the switching relay is opened for a moment and the input side of the vibration component extraction circuit 108 is opened. Therefore, the disconnection detection circuit 11
Since this is detected by 1 and the output of the amplifier circuit 110 is clamped to the ground potential, the low output alarm circuit 10
3 operates and outputs an alarm signal indicating the disconnection of the vibration detector 101.

Further, in such a method, when the vibration signal having a magnitude of "1/2" of the maximum amplitude is input, the large vibration alarm circuit 105 operates to increase the vibration of the turbine rotor. There is a problem in that an alarm signal indicating is output.

In view of the above circumstances, it is an object of the present invention to provide a turbine monitoring device capable of checking whether or not the vibration circuit board operates normally without causing malfunction of each alarm circuit.

[0025]

In order to achieve the above object, a turbine monitoring apparatus according to the present invention includes a vibration circuit board which receives a vibration detection signal output from a vibration detector provided in the turbine. In a turbine monitoring device that monitors the operating state, when performing a function check of the vibration circuit board, a process for preventing the output of the vibration circuit board from being input to each alarm device, and shutting off the alarm power supply of each alarm device A cutoff circuit for processing and an input switching circuit for cutting off the signal from the vibration detector and inputting a preset signal to the vibration circuit board when the function of the vibration circuit board is checked. It is characterized by

[0026]

In the above structure, when the function of the vibrating circuit board is checked, processing for preventing the output of the vibrating circuit board from being input to each alarm device by the shutoff circuit and shutting off the alarm power supply of each alarm device are performed. As the processing is performed, the signal from the vibration detector is blocked by the input switching circuit, and the preset signal is input to the vibration circuit board.

[0027]

1 is a circuit diagram showing an embodiment of a turbine monitoring apparatus according to the present invention.

The turbine monitoring device shown in this figure includes a vibration detector 1, a vibration signal generator 2, a function switching circuit 3, a vibration circuit board 4, a low output warning circuit 5, and a large vibration warning circuit 6. The check function circuit 7 is provided, and when each check function is not selected by the function switching circuit 3, the vibration detection signal obtained by the vibration detector 1 is used as the vibration detector 1-> check function circuit 7-> vibration circuit board. 4 → Check function circuit 7 → Low output warning circuit 5 The low output warning circuit 5 is led to the low output warning circuit 5 to check whether the vibration detector 1 is disconnected, and the displacement signal output from the vibration circuit board 4 A displacement signal obtained based on the value of the vibration detection signal output from the vibration detector 1 by guiding it to a recorder (not shown) or the large vibration alarm circuit 6. Or to record the value, the value of the displacement signal or to check whether it exceeds the alarm point which is set in advance. When the first check function or the second check function is selected by the function switching circuit 3, the check function circuit 7 shuts off the path of the vibration circuit board 4 → check function circuit 7 → low output alarm circuit 5, While the relay power supply of the large vibration alarm circuit 6 is cut off, the input of the vibration circuit board 4 is switched by the check function circuit 7 to check whether or not the vibration circuit board 4 operates normally.

The vibration detector 1 is equipped with a vibration detection coil attached to the turbine and a resistance for adjusting the output signal, and generates a vibration detection signal according to the vibration of the turbine rotor to check it. Supply to 7.

Further, the vibration signal generator 2 generates a vibration detection signal of maximum amplitude and supplies it to the check function circuit 7.

The function switching circuit 3 includes a power supply 8 for generating a power supply voltage, an automatic terminal for performing measurement, a first check function terminal for performing a first check function, and a second check function for performing a second check function. And a changeover switch 9 having a terminal. When the first check function terminal is selected by the changeover switch 9, a first relay ON voltage is generated and supplied to the check function circuit 7, and the changeover switch is also provided. When the second check function terminal is selected by 9, the second and third relay ON voltages are generated and supplied to the check function circuit 7.

The vibration circuit board 4 further includes a vibration component extraction circuit for amplifying the vibration detection signal output from the check function circuit 7 to extract a vibration component, and a vibration component signal output from the vibration component extraction circuit. An integrating circuit for integrating, an amplifying circuit for amplifying a displacement signal output from the integrating circuit, and a direct current level on the input side of the vibration component extracting circuit are detected, and when the vibration detector is disconnected, this is detected. A disconnection detection circuit that detects and clamps the output of the amplification circuit to the ground potential, and when the output of the amplification circuit is clamped to the ground potential by the disconnection detection circuit, it becomes conductive and the value of the displacement signal becomes zero. And a V / I conversion circuit that takes in the displacement signal output from the amplification circuit and converts the displacement signal into a current signal (transmission signal). After taking in the vibration detection signal output from the circuit 7 and extracting the vibration component (AC component), the vibration component is integrated to generate a displacement signal, which is directly supplied to the large vibration alarm circuit 6. , The displacement signal passing through the diode is returned to the check function circuit 7,
Further, the displacement signal converted into the transmission signal of 4-20 mA by the V / I conversion circuit is directly supplied to the recorder.

The low output alarm circuit 5 takes in the displacement signal output via the diode of the vibration circuit board 4 via the check function circuit 7, and the value of this displacement signal is smaller than a preset value. When the value of the displacement signal output from the check function circuit 7 is smaller than a preset value, the vibration is provided under a severe environment such as a slight vibration. It is determined that the coil or the like of the detector 1 is broken, and an alarm signal is generated to notify the operator or the like of this.

The recorder is equipped with a recording mechanism that takes in the transmission signal output from the V / I conversion circuit of the vibration circuit board 4 and records it on recording paper or in a memory. The transmission signal output from the V / I conversion circuit is captured and recorded on recording paper or in a memory.

Whether the value of the displacement signal output from the vibration circuit board 4 is greater than a preset alarm point when the relay power is supplied from the check function circuit 7 to the large vibration alarm circuit 6 Is provided with a determination circuit that determines whether the displacement signal output from the vibration circuit board 4 is larger than a preset alarm point while relay power is being supplied from the check function circuit 7. At this time, it is determined that the vibration of the turbine rotor monitored by the vibration detector 1 has become too large, and an alarm signal is generated to notify the operator or the like.

The check function circuit 7 includes three switching relays 10 to 12, one variable resistor 13, one resistor 14, a time constant circuit 15, a MOS relay circuit 16, and
When the first check function or the second check function is not selected by the function switching circuit 3, the transistor switch 17 is provided, and the vibration detector 1 is operated while supplying the relay power of the large vibration alarm circuit 6. The received vibration detection signal is taken in and returned to the vibration circuit board 4, and the displacement signal outputted from the vibration circuit board 4 is taken in and returned to the low output alarm circuit 5 to obtain the vibration detector. Have them check if 1 is broken. Further, when the first check function or the second check function is selected by the function switching circuit 3, the signal transmission between the vibration circuit board 4 and the low output warning circuit 5 is cut off, and the large vibration warning circuit 6 After stopping the supply of relay power to the vibration circuit board 7, the input of the vibration circuit board 7 is switched to check whether the vibration circuit board 7 operates normally.

Each of the switching relays 10 to 12 is connected to each of the C contacts 10a, 10 when the first relay-on voltage and the second and third relay-on voltages are not output from the function switching circuit 3.
b, 10c, 11a, 12a, 12b, 12c are normally closed, and the power supply voltage supplied to the power supply line 18 is supplied to the large vibration alarm circuit 6 as a relay power supply voltage and obtained by the vibration detector 1. Is the vibration detector 1 disconnected by introducing the vibration detection signal to the low output alarm circuit 5 through the path of the vibration detector 1 → check function circuit 7 → vibration circuit board 4 → check function circuit 7 → low output alarm circuit 5? Let me check. When the function switching circuit 3 outputs the first relay ON voltage, only the first relay 10 is turned on and the corresponding C contact 10 is turned on.
a, 10b, 10c are opened so that the supply of the relay power supply voltage to the large vibration alarm circuit 6 is stopped, and the output side of the vibration circuit board 4 and the input side of the low output alarm circuit 5 are connected. In the cutoff state, the input of the vibration circuit board 4 is switched to 0V, and the function of the vibration circuit board 4 is checked. Also,
When the function switching circuit 3 outputs the second and third relay ON voltages, the second relay 11 and the third relay 1
Only 2 is turned on and the corresponding C contacts 11a, 12
a, 12b, 12c are set to the open side, whereby the supply of the relay power supply voltage to the large vibration alarm circuit 6 is stopped, and the output side of the vibration circuit board 4 and the input side of the low output alarm circuit 5 are connected. In the cutoff state, the input of the vibration circuit board 4 is switched to a vibration detection signal having a magnitude of 1/2 of the maximum amplitude to check the function of the vibration circuit board 4.

Further, the variable resistor 13 takes in the vibration detection signal of the maximum amplitude output from the vibration signal generator 2 and makes it a size corresponding to the sliding terminal position, for example, a size of 1/2. , When the C contacts 11a, 12a are both open, the C contacts 11a, 12a
1 / maximum amplitude to the vibration circuit board 4 via
A vibration detection signal having a magnitude of 2 is supplied.

Further, the resistor 14 is the C contact 10c, 1
When both 2c are normally closed, the power supply line 1
The power supply voltage supplied from 8 is taken in and supplied to the time constant circuit 15.

The time constant circuit 15 determines when a power supply voltage is applied between both terminals of the resistor 14 and when an ON signal is output based on the result of the determination by the determination circuit 19. When the ON signal is output based on the resistance 20 which takes in the voltage and supplies it to the transistor switch 17 and the judgment result of the judgment circuit 19, the MOS transistor is taken into the ON state to be turned on.
A transistor 21 for turning on the relay circuit 16 is provided, and when a voltage is applied across the resistor 14, two ON signals are generated to generate the transistor switch 17 and the MOS relay circuit 16. To turn on. Then, when the power supply voltage is not applied across the resistor 14 in this state, the generation of the ON signal is stopped and the transistor switch 17 and the MOS relay circuit 16 are turned off. After that, when the application of the power supply voltage to the resistor 14 is restarted, two ON signals are generated with a delay of a preset time, thereby turning on the transistor switch 17 and the MOS relay circuit 16. Put in a state.

The MOS relay circuit 16 comprises a resistor 22 and a light emitting diode 23 connected in series, and a MOS transistor 24 which is turned on when the light emitting diode 23 emits light. The time constant circuit 15 turns on the MOS transistor 24. When a signal is output, the light emitting diode 23 is caused to emit light to turn on the MOS transistor 24, and the displacement signal from the vibrating circuit board 4 supplied via the C contacts 10b and 12b is taken in and is output. It is supplied to the low output alarm circuit 5.

The transistor switch 17 is turned on when the ON signal is being output from the time constant circuit 15 and takes in the power supply voltage supplied through the C contacts 10c and 12c and supplies it to the relay power supply. It is supplied as a voltage to the large vibration alarm circuit 6.

Next, referring to the circuit diagram shown in FIG.
The vibration measurement operation, the first check function operation, and the second check function operation of this embodiment will be sequentially described.

First, when the automatic terminal is selected by the changeover switch 9 of the function changeover circuit 3, each of the changeover relays 10 to 12 of the check function circuit 7 is turned off, and each of these changeover relays 10 to 12 is turned off. Each C contact 10
a, 10b, 10c, 11a, 12a, 12b, 12c
Is normally closed, the time constant circuit 15 generates two ON signals by the power supply voltage from the power supply line 18, and the transistor switch 17 and the MOS relay circuit 16 are turned on.

As a result, as shown in FIG. 2, the power supply voltage supplied from the power supply line is used as the relay power supply voltage. Power supply line → C contact 12c of the check function circuit 7 → C contact 10
It is supplied to the large vibration alarm circuit 6 through a route of c → transistor switch 17 → large vibration alarm circuit 6, and the large vibration alarm circuit 6 is set to an alarm output enabled state.

At this time, the vibration detection signal obtained by the vibration detector 1 is changed from the vibration detector 1 to the check function circuit 7
C contact 10a → C contact 12a → vibration circuit board 4 is supplied to the vibrating circuit board 4 for processing and the processing result of the vibrating circuit board 4 is directly supplied to the recorder for recording. It is checked whether or not the displacement of the turbine rotor, which is directly supplied to the large vibration alarm circuit 6 and is a measurement target of the vibration detector 1, exceeds an alarm point.

Further, the processing result of the vibration circuit board 4 is the vibration circuit board 4 → check function circuit 7
C contact 10b → C contact 12b → MOS relay circuit 16
The MOS transistor 24 → the low output alarm circuit 5 is guided to the low output alarm circuit 5 to check whether the vibration detector 1 is disconnected.

In this state, when the changeover switch 9 of the function changeover circuit 3 is changed over and the first check function is selected by this changeover switch 9, the first changeover relay 10 of the check function circuit 7 is turned on. The corresponding C contacts 10a, 10b, 10c are switched to the open side.

As a result, as shown in FIG. 3, the supply of the relay power supply voltage to the large vibration alarm circuit 6 is stopped, and the alarm output of the large vibration alarm circuit 6 is prohibited.
The output side of the vibration circuit board 4 and the input side of the low output alarm circuit 5 are cut off, and in this state, the input of the vibration circuit board is switched to 0V,
The function of the vibrating circuit board 4 and the function of the recorder are checked.

In this state, if the changeover switch 9 of the function changeover circuit 3 is changed over and the second check function is selected by this changeover switch 9, the check function circuit 7
The second switching relay 11 and the third switching relay 12 are turned on and the corresponding C contacts 11a, 12a, 12b, 1
Switch 2c to the open side.

As a result, as shown in FIG. 4, the supply of the relay power source voltage to the large vibration alarm circuit 6 is continuously stopped, and the output side of the vibration circuit board 4 and the input side of the low output alarm circuit 5 are connected. Is continuously cut off, one end of the vibration signal generator 2 and one end of the variable resistor 13 are grounded through a path of the C contact 11a → grounding point, and the other end of the vibration signal generator 2 is output. The detected vibration signal is guided to the variable resistor 13 through the path from the other end of the vibration signal generator 2 to the variable resistor 13 to reduce its amplitude to 1/2, and then the sliding terminal of the variable resistor 13 → C The function of the vibrating circuit board and the function of the recorder are checked by being guided to the vibrating circuit board 4 through a path from the contact 12c to the vibrating circuit board 4.

Thereafter, the function check of the vibration circuit board 4 and the function check of the recorder by the first check function and the second check function are completed, and the changeover switch 9 of the function changeover circuit 3 is returned to the automatic terminal. Then, the switching relays 10, 11, 1 of the check function circuit 7
2 are both turned off, and each of these switching relays 10
~ 12 C contacts 10a, 10b, 10c, 11a, 1
The power supply voltage from the power supply line 18 applies the power supply voltage between both ends of the resistor 14 while 2a, 12b and 12c are normally closed.

As a result, as shown in FIG. 5, the vibration detection signal obtained by the vibration detector 1 is transmitted through the vibration detector 1 → the C contact 10a of the check function circuit 7 → the C contact 12a → the vibration circuit board 4 in the vibration circuit. The vibration detection signal output from the vibration detector 1 is guided to the board 4, and the processing of the vibration detection signal is started. The recording of the displacement signal output from the vibration circuit board 4 is restarted by the recorder. At this point in time, since the time constant circuit does not output two ON signals, the transistor switch 17 and the MO
The S relay circuit 16 is held in the OFF state to supply the relay power supply voltage to the large vibration alarm circuit 6 and the low output alarm circuit 5.
The supply of the displacement signal from the vibration circuit board 4 continues to be prohibited.

Then, when a preset time elapses after the power supply voltage is applied across the resistor 14, two ON signals are generated by the time constant circuit 15 to generate the transistor switch 17 and the MOS relay. The circuit 16 is turned on.

As a result, as shown in FIG. 6, the processing result of the vibration circuit board 4 is the vibration circuit board 4 → C contact 10b → C contact 12b → MO of the check function circuit 7.
The MOS transistor 24 of the S relay circuit 16 → the low output alarm circuit 5 is guided to the low output alarm circuit 5 to check whether the vibration detector 1 is disconnected or not, and is supplied from the power supply line 18. Based on the value of the vibration detection signal output from the vibration detector 1 when the power supply voltage is guided to the power supply line 18 → C contact 12c of the check function circuit 7 → C contact 10c → transistor switch 17 → large vibration alarm circuit 6 It is checked whether the value of the displacement signal obtained exceeds a preset alarm point.

As described above, in this embodiment, when the input of the vibration circuit board 4 is switched to check the functions of the vibration circuit board 4 and the recorder, the output of the vibration circuit board 4 is output to the low output alarm circuit 5. The input of the vibration circuit board 4 is temporarily stopped when the input of the vibration circuit board 4 is switched as shown in FIG. Even if it is opened, it is possible to check whether the vibration circuit board 4 or the recorder operates normally without causing the low output alarm circuit 5 and the large vibration alarm circuit 6 to malfunction.

Further, in the above-described embodiment, when the check function circuit 7 is provided with the three switching relays 10 to 12 to check the function of the vibration circuit board 4, the output of the vibration circuit board 4 is a low output alarm circuit. 5 and the supply of the relay power supply voltage to the large vibration alarm circuit 6 is stopped. However, each C contact portion 1 of each of these switching relays 10 to 12 is stopped.
Even if an electronic switch such as an analog switch is provided in place of 0a to 12c to switch the circuit connection, the low output alarm circuit 5 and the large vibration alarm circuit 6 are provided as in the above-described embodiment.
It is possible to check whether or not the vibrating circuit board 4 operates normally without causing a malfunction of.

[0058]

As described above, according to the present invention, it is possible to check whether the vibrating circuit board operates normally without causing malfunction of each alarm circuit.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a turbine monitoring device according to the present invention.

FIG. 2 is a schematic diagram showing an operation example of the turbine monitoring device shown in FIG.

FIG. 3 is a schematic diagram showing an operation example of the turbine monitoring device shown in FIG.

FIG. 4 is a schematic diagram showing an operation example of the turbine monitoring device shown in FIG. 1.

5 is a schematic diagram showing an operation example of the turbine monitoring device shown in FIG. 1. FIG.

FIG. 6 is a schematic diagram showing an operation example of the turbine monitoring device shown in FIG.

FIG. 7 is a waveform diagram showing an operation example of the turbine monitoring device shown in FIG. 1.

FIG. 8 is a circuit diagram showing an example of a conventionally known turbine monitoring device.

[Explanation of symbols]

1 Vibration Detector 2 Vibration Signal Generator 3 Function Switching Circuit 4 Vibration Circuit Board 5 Low Output Alarm Circuit 6 Vibration Large Alarm Circuit 7 Check Function Circuit 10, 11, 12 Switching Relays 10a, 11a, 12a C Contact (Input Switching Circuit) 10b, 12b, 10c, 12c, C contact (breaking circuit) 17 transistor switch (breaking circuit) 24 MOS transistor (breaking circuit)

Claims (1)

[Claims] 1. A turbine monitoring device for monitoring the operating state of the turbine by taking in a vibration detection signal output from a vibration detector provided in the turbine by a vibration circuit board, when performing a function check of the vibration circuit board. A shutoff circuit for performing a process for preventing the output of the vibration circuit board from being input to each alarm device and a process for shutting off the alarm power supply of each alarm device; and a vibration circuit when performing a function check of the vibration circuit board. An input switching circuit that cuts off a signal from a detector and inputs a preset signal to the vibration circuit board, the turbine monitoring device.