JPH05187970A - Monitoring device of turbine - Google Patents

Abstract

PURPOSE:To output a correct output signal at all times by correcting the value of a signal outputted from a sensor part, even when it changes due to a change of an ambient temperature of the sensor part. CONSTITUTION:The temperature of a sensor main body 3 of a sensor part 1 is detected by a resistor 4 for temperature detection which is fitted to the sensor main body 3. A signal outputted from the sensor main body 3 in accordance with a resistance value of the resistor 4 is corrected by a comparative correction circuit 9 of an amplifying part 2 and a signal obtained by this correcting operation is amplified by an amplifier circuit and outputted.

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 the operating states of turbines, pumps and the like of thermal power stations and nuclear power stations of electric power companies.

[0002]

2. Description of the Related Art A circuit shown in FIG. 2 has been conventionally known as a basic circuit of each system (vibrometer, differential expansion meter eccentricity meter, etc.) of a turbine monitoring device for monitoring the operating conditions of a turbine, a pump and the like.

The basic circuit shown in this figure has a sensor section 101 attached to a pump or the like to be monitored, and an amplifier circuit 103. The AC signal output from the sensor section 101 is converted into a DC signal and then amplified. The sensor unit 101 detects the operating state of a pump (not shown) and the AC signal obtained by this detection operation is converted into a DC signal by the amplifier unit 102. After that, it is amplified and output to each monitoring system (computer, recorder, etc.).

[0004]

However, in the above-mentioned conventional turbine monitoring device, although the operating states of the turbine, the pump and the like are not changed,
The sensor unit 1 changes according to changes in the ambient temperature of the sensor unit 101.
There is a problem that the output of the sensor unit 101 changes due to the temperature characteristic of 01, and an output signal as if the operating states of the turbine, the pump and the like have changed is output.

In view of the above-mentioned circumstances, the present invention corrects the value of the signal output from the sensor unit even when the ambient temperature of the sensor unit changes, and corrects it to always output a correct output signal. It is an object of the present invention to provide a turbine monitoring device capable of performing the above.

[0006]

In order to achieve the above object, a turbine monitoring apparatus according to the present invention detects an operating state of a portion to be monitored by a sensor portion arranged in a portion to be monitored, and detects the operation result. In a turbine monitoring device that amplifies and outputs by an amplifier unit, a resistor for temperature detection, which is attached to a sensor body that constitutes the sensor unit and has a resistance value that changes according to the temperature of the sensor body, and a resistance of the resistor. A comparison correction circuit for correcting a signal output from the sensor body according to a value is provided.

[0007]

In the above structure, the signal output from the sensor body is corrected by the comparison and correction circuit in accordance with the resistance value of the resistor attached to the sensor body of the sensor section. Even if the value of the signal output from the sensor body changes, an error does not occur in the output signal obtained based on the output of the sensor body.

[0008]

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

The turbine monitoring apparatus shown in this figure includes a sensor section 1 attached to a pump or the like to be monitored, and an amplifier section for converting an AC signal output from the sensor section 1 into a DC signal and then amplifying and outputting the DC signal. 2, the sensor unit 1 detects the operating state of a pump (not shown), the AC signal obtained by this detection operation is converted into a DC signal by the amplifier unit 2, and then amplified. Output to each monitoring system (computer, recorder, etc.).

The sensor unit 1 is a sensor main body 3 that detects an operating state of a pump or the like and generates an AC signal, and is externally or originally attached to the sensor main body 3 and has a resistance according to the ambient temperature of the sensor main body 3. And a resistance for temperature detection 4 that has a value and detects an operating state of a pump or the like to be monitored and supplies an AC signal obtained by this detection operation to the amplifier unit 2 and also the sensor body. Three
The temperature of the portion is detected and supplied to the amplifier section 2 as a change in the resistance value of the resistor 4.

The amplifier section 2 is composed of a reference voltage source 5 for generating a reference voltage and two resistors 6 and 7, and each of the resistors 6 and 7 and the resistor 4 constituting the sensor section 1 serves as the reference. A voltage dividing circuit 8 that divides the reference voltage output from the voltage source 5 and outputs the divided voltage as a temperature detection signal obtained by this voltage dividing operation, and the sensor unit based on the temperature detection signal output from this voltage dividing circuit 8. 1. A comparison correction circuit 9 for converting the AC signal output from the sensor main body 3 constituting 1 into a DC signal and then correcting the same, and an amplifier circuit 10 for amplifying the DC signal output from the comparison correction circuit 9.
And converting the AC signal output from the sensor body 3 constituting the sensor unit 1 into a DC signal based on the resistance value of the resistor 4 provided in the sensor unit 1, and then performing temperature correction. In addition to correcting the change caused by the temperature change, this is amplified and the DC signal obtained by this amplifying operation is output to each monitoring system (computer, recorder, etc.).

In this case, if the temperature of the resistor 4 constituting the sensor section 1 reaches the set temperature, the voltage dividing circuit 8 outputs a temperature detection signal having a voltage value E1 shown in the following equation.

E1 = R2 / (R1 + R2 + R3) .E (1) where E1: value of temperature detection signal R1: value of resistor 4 R2: value of resistor R3: value of resistor 6 E: reference voltage source The value of the reference voltage output from the sensor unit 5. When the ambient temperature of the sensor body 3 forming the sensor unit 1 changes and the value of the AC signal output from the sensor unit 3 changes, the sensor unit 1 is turned on. The value of the resistor 4 that is configured changes and the voltage value E1 shown in the following equation is obtained from the voltage dividing circuit 8.
'Temperature detection signal is output.

E1 ′ = R2 / ((R1 + ΔR1) + R2 + R3) · E (2) where E1 ′ is the value of the temperature detection signal ΔR1: is the amount of change in the resistance value of the resistor. When the ambient temperature of 3 is room temperature, the ambient temperature of the sensor body 3 is changed only by setting the value of the temperature detection signal shown by the equation (1) in the comparison and correction circuit 9, and the equation (2) is changed. When the value of the temperature detection signal changes as shown in FIG. 5, the comparison correction circuit 9 can cancel the temperature change of the AC signal output from the sensor body 3 in accordance with the value change of the temperature detection signal. As a result, it is possible to eliminate the occurrence of an error caused by a change in the ambient temperature of the sensor body 3.

As described above, in this embodiment, the temperature detecting resistor 4 is arranged in the sensor body 3 and the resistor 4 is used.
Since the value of the AC signal output from the sensor body 3 is corrected according to the change in the resistance value of the sensor unit 1, the ambient temperature of the sensor unit 1 changes and the value of the signal output from the sensor unit 1 changes. Even if this is corrected, a correct output signal can always be output.

Further, in the above-mentioned embodiment, the temperature measuring resistor 4 is attached to the sensor body 3 of the sensor portion 1, but the output correcting resistor provided in the sensor 1 from the beginning is used for temperature adjustment. It may be used as the resistance 4 for measurement.

By doing so, the conventionally used sensor section 1 can be used, and thus the above-described circuit can be manufactured without newly forming the sensor section 1.

[0018]

As described above, according to the present invention, even if the ambient temperature of the sensor part changes and the value of the signal output from the sensor part changes, this is corrected and a correct output signal is always obtained. Can be output.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing an example of a basic circuit of a conventionally known turbine monitoring device.

[Explanation of symbols]

 1 sensor part 2 amplifier part 3 sensor body 4 temperature detection resistor 8 voltage dividing circuit 9 comparison correction circuit 10 amplifier circuit

Claims (1)

[Claims] 1. A turbine monitoring device in which a sensor unit arranged in a portion to be monitored detects an operating state of a portion to be monitored, and the detection result is amplified and output by an amplifier unit, which constitutes the sensor unit. A resistor for temperature detection, which is attached to the sensor body and whose resistance value changes according to the temperature of the sensor body; and a comparison correction circuit for correcting a signal output from the sensor body according to the resistance value of the resistance, A turbine monitoring device comprising: