Temperature measuring circuit and temperature monitoring system for slip ring chamber of hydraulic turbine set

Abstract

The utility model discloses a temperature measurement circuit and a temperature monitoring system for a slip ring chamber of a hydraulic turbine set, and relates to the technical field of hydroelectric generation, the temperature measurement circuit comprises a temperature detection circuit, the temperature detection circuit is arranged on the side wall of the slip ring chamber of the hydraulic turbine set, and the temperature detection circuit is used for detecting a temperature signal of the slip ring chamber of the hydraulic turbine set; the temperature signal is converted into an electric signal to be output; the input end of the signal amplification circuit is connected with the output end of the temperature detection circuit; the output end of the signal amplification circuit is connected with the input end of the pull-down circuit and the detection input end of the control module, and the control output end of the control module is connected with the control end of the pull-down circuit; when the detection input end of the control module detects that the voltage is higher than the preset threshold value, the control module controls the pull-down circuit to increase the pull-down value. The temperature measurement range of the temperature measurement circuit is improved through the pull-down circuit, and overvoltage breakdown of the temperature measurement chip is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of hydropower generation, in particular to a temperature measurement circuit and a temperature monitoring system for a slip ring chamber of a water turbine unit. Background Art

[0002] A water turbine is a device that converts the energy of water flow into rotational mechanical energy. Most modern water turbines are installed in hydropower stations to drive generators to generate electricity. When the water turbine is working, due to the large load it bears, the temperature of the water turbine will be too high. That is, the temperature of the water turbine when driving the engine can be as high as hundreds of degrees Celsius. If the water turbine works at a high temperature for a long time, it will malfunction, resulting in the water turbine being unable to drive the generator to generate electricity.

[0003] When the existing water turbines are used in conjunction with generators, there is often a lack of a device for monitoring the temperature of the equipment, resulting in the long-term operation of the water turbine affecting the rotational connection efficiency, thereby reducing the power generation efficiency. Moreover, the existing monitoring system of the water turbine lacks a remote monitoring method, which is not conducive to users to timely understand the working state of the water turbine and reduces the practicability of the device. Secondly, when the existing temperature measurement circuit detects the temperature of the device under test, if the difference between the highest temperature and the lowest temperature of the device under test is large, when the thermistor drops from a high resistance value to a low resistance value, it is possible to overvoltage breakdown the temperature measurement chip. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a temperature measurement circuit and a temperature monitoring system for a slip ring chamber of a water turbine unit. In this application, a pull-down circuit is added. When the detection input end of the control module detects that the voltage is higher than the preset threshold, the control module controls the pull-down circuit to increase the pull-down value. At the same time, the temperature is continuously accumulated on the basis of the temperature value before the pull-down, which improves the temperature measurement range of the temperature measurement circuit and prevents the overvoltage breakdown of the temperature measurement chip.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] One aspect of the embodiment of the utility model provides a temperature measurement circuit for a slip ring chamber of a water turbine unit. The temperature measurement circuit includes: a temperature detection circuit, which is arranged on the side wall of the slip ring chamber of the water turbine unit and is used to detect the temperature signal of the slip ring chamber of the water turbine unit and convert the temperature signal into an electrical signal for output; a signal amplification circuit, the input end of which is connected to the output end of the temperature detection circuit; a pull-down circuit and a control module, the output end of the signal amplification circuit is connected to the input end of the pull-down circuit and the detection input end of the control module, and the control output end of the control module is connected to the control end of the pull-down circuit; when the detection input end of the control module detects that the voltage is higher than the preset threshold, the control module controls the pull-down circuit to increase the pull-down value.

[0007] In some embodiments, the temperature detection circuit includes a thermistor and a first resistor. One end of the thermistor is connected to a first power supply, and the other end of the thermistor is connected to one end of the first resistor and the input end of the signal amplification circuit. The other end of the first resistor is grounded.

[0008] In some embodiments, the signal amplification circuit includes a first signal amplification circuit and a second signal amplification circuit. The first signal amplification circuit includes an operational amplifier, a second resistor, a third resistor, and a fourth resistor. The non-inverting input terminal of the operational amplifier is grounded through the third resistor. The inverting input terminal of the operational amplifier is connected to the output terminal of the temperature detection circuit through the second resistor. The output terminal of the operational amplifier is connected to the inverting input terminal of the operational amplifier through the fourth resistor. The output terminal of the operational amplifier is connected to the input terminal of the second signal amplification circuit. The output terminal of the second signal amplification circuit is connected to the input terminal of the pull-down circuit and the detection input terminal of the control module.

[0009] In some embodiments, the second signal amplification circuit includes a PMOS transistor, a fifth resistor, and a sixth resistor. The gate of the PMOS transistor is connected to the output terminal of the operational amplifier through the fifth resistor. The source of the PMOS transistor and one end of the sixth resistor are connected to a second power supply. The other end of the sixth resistor is connected to the gate of the PMOS transistor. The drain of the PMOS transistor is connected to the input terminal of the pull-down circuit and the detection input terminal of the control module.

[0010] In some embodiments, the pull-down circuit includes a seventh resistor and an adjustment circuit. One end of the seventh resistor is connected to the output terminal of the signal amplification circuit, the detection input terminal of the control module, and the input terminal of the adjustment circuit. The other end of the seventh resistor and the output terminal of the adjustment circuit are grounded. The control terminal of the adjustment circuit is connected to the control output terminal of the control module.

[0011] In some embodiments, the adjustment circuit includes an NPN transistor, an eighth resistor, a ninth resistor, and a tenth resistor. The collector of the NPN transistor is connected to one end of the eighth resistor. The other end of the eighth resistor is connected to one end of the seventh resistor, the output terminal of the signal amplification circuit, and the detection input terminal of the control module. The base of the NPN transistor is connected to one end of the ninth resistor and one end of the tenth resistor. The other end of the tenth resistor is connected to the control output terminal of the control module. The other end of the ninth resistor and the emitter of the NPN transistor are grounded.

[0012] In some embodiments, the temperature measurement circuit further includes an eleventh resistor and a capacitor. One end of the eleventh resistor is connected to one end of the seventh resistor, the output end of the signal amplification circuit, and the other end of the eighth resistor. The other end of the eleventh resistor is connected to one end of the capacitor and the detection input end of the control module. The other end of the capacitor is grounded.

[0013] One aspect of the embodiments of the present utility model provides a temperature monitoring system for the slip ring chamber of a water turbine unit. The temperature monitoring system includes the temperature measurement circuit and a host computer as described above. The detection output end of the control module is connected to the host computer.

[0014] According to the temperature measurement circuit and temperature monitoring system for the slip ring chamber of a water turbine unit in the embodiments of the present utility model, it has at least the following beneficial effects: The present application adds a pull-down circuit. When the detection input end of the control module detects that the voltage is higher than the preset threshold, the pull-down circuit is controlled to increase the pull-down value. At the same time, if the temperature continues to rise, the temperature is continuously increased on the basis of the temperature value of the preset threshold, improving the temperature measurement range of the temperature measurement circuit and preventing the temperature measurement chip from being broken down by overvoltage. The present application uses a host computer to remotely monitor the temperature of the slip ring chamber of the water turbine unit.

[0015] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic diagram of the temperature measurement circuit according to the embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0019] The terms "first", "second", "third" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first", "second", "third" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0020] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "connected", "installed", "connected to", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0021] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art. The drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus repeated descriptions thereof will be omitted.

[0022] The technical solutions of the embodiments of the present application will be briefly described below:

[0023] According to some embodiments, as Figure 1 shown, the present application provides a temperature measurement circuit for the slip ring chamber of a water turbine unit. The temperature measurement circuit includes:

[0024] A temperature detection circuit, which is arranged on the side wall of the slip ring chamber of the water turbine unit. The temperature detection circuit is used to detect the temperature signal of the slip ring chamber of the water turbine unit and convert the temperature signal into an electrical signal for output;

[0025] A signal amplification circuit, the input end of which is connected to the output end of the temperature detection circuit;

[0026] A pull-down circuit and a control module. The output end of the signal amplification circuit is connected to the input end of the pull-down circuit and the detection input end 1 of the control module, and the control output end 2 of the control module is connected to the control end of the pull-down circuit;

[0027] When the detection input end 1 of the control module detects that the voltage is higher than the preset threshold, the control module controls the pull-down circuit to increase the pull-down value.

[0028] Based on the working principle of the above embodiments, the temperature detection circuit detects the temperature signal of the slip ring chamber of the water turbine unit, converts the temperature signal into an electrical signal and outputs it to the signal amplification circuit. The signal amplification circuit amplifies the electrical signal and then outputs it to the detection input terminal 1 of the control module and the input terminal of the pull-down circuit. The control module calculates the temperature of the slip ring chamber of the water turbine unit according to the amplified electrical signal.

[0029] When the temperature of the slip ring chamber of the water turbine unit is high, the voltage output by the temperature detection circuit is high; when the temperature of the slip ring chamber of the water turbine unit is low, the voltage output by the temperature detection circuit is low. When the temperature of the slip ring chamber of the water turbine unit is higher than the preset threshold, there is a risk of breaking down the control module. Therefore, the control module controls the pull-down circuit to increase the pull-down value, so that the voltage of the detection input terminal 1 of the control module decreases. At the same time, if the temperature continues to rise, the temperature is increased continuously at the temperature value of the preset threshold, which increases the temperature measurement range of the temperature measurement circuit and prevents the temperature measurement chip from being broken down by overvoltage.

[0030] The following combines the appendix of this specification Figure 1 to further elaborate on the preferred embodiments of the present disclosure in detail.

[0031] According to some embodiments, as Figure 1 shown, the temperature detection circuit includes a thermistor RP and a first resistor R1. One end of the thermistor RP is connected to the first power supply V1, the other end of the thermistor RP is connected to one end of the first resistor R1 and the input end of the signal amplification circuit, and the other end of the first resistor R1 is grounded.

[0032] Among them, when the temperature of the slip ring chamber of the water turbine unit is high, the resistance value of the thermistor RP decreases; when the temperature of the slip ring chamber of the water turbine unit is low, the resistance value of the thermistor RP increases.

[0033] According to some embodiments, as Figure 1 shown, the signal amplification circuit includes a first signal amplification circuit and a second signal amplification circuit. The first signal amplification circuit includes an operational amplifier U, a second resistor R2, a third resistor R3, and a fourth resistor R4. The non-inverting input terminal of the operational amplifier U is grounded through the third resistor R3, the inverting input terminal of the operational amplifier U is connected to the output terminal of the temperature detection circuit through the second resistor R2, the output terminal of the operational amplifier U is connected to the inverting input terminal of the operational amplifier U through the fourth resistor R4, the output terminal of the operational amplifier U is connected to the input terminal of the second signal amplification circuit, and the output terminal of the second signal amplification circuit is connected to the input terminal of the pull-down circuit and the detection input terminal 1 of the control module.

[0034] According to some embodiments, as Figure 1As shown, the second signal amplification circuit includes PMOS transistor QP, fifth resistor R5 and sixth resistor R6. The gate of PMOS transistor QP is connected to the output terminal of operational amplifier U through the fifth resistor R5. The source of PMOS transistor QP and one end of the sixth resistor R6 are connected to the second power supply V2. The other end of the sixth resistor R6 is connected to the gate of PMOS transistor QP. The drain of PMOS transistor QP is connected to the input terminal of the pull-down circuit and the detection input terminal 1 of the control module.

[0035] According to some embodiments, as Figure 1 shown, the pull-down circuit includes seventh resistor R7 and an adjustment circuit. One end of the seventh resistor R7 is connected to the output terminal of the signal amplification circuit, the detection input terminal 1 of the control module and the input terminal of the adjustment circuit. The other end of the seventh resistor R7 and the output terminal of the adjustment circuit are grounded. The control terminal of the adjustment circuit is connected to the control output terminal 2 of the control module.

[0036] According to some embodiments, as Figure 1 shown, the adjustment circuit includes NPN transistor QN, eighth resistor R8, ninth resistor R9 and tenth resistor R10. The collector of NPN transistor QN is connected to one end of the eighth resistor R8. The other end of the eighth resistor R8 is connected to one end of the seventh resistor R7, the output terminal of the signal amplification circuit and the detection input terminal 1 of the control module. The base of NPN transistor QN is connected to one end of the ninth resistor R9 and one end of the tenth resistor R10. The other end of the tenth resistor R10 is connected to the control output terminal 2 of the control module. The other end of the ninth resistor R9 and the emitter of NPN transistor QN are grounded.

[0037] According to some embodiments, as Figure 1 shown, the temperature measurement circuit further includes eleventh resistor R11 and capacitor C. One end of the eleventh resistor R11 is connected to one end of the seventh resistor R7, the output terminal of the signal amplification circuit and the other end of the eighth resistor R8. The other end of the eleventh resistor R11 is connected to one end of the capacitor C and the detection input terminal 1 of the control module. The other end of the capacitor C is grounded.

[0038] Based on the working principle of the above embodiments, as Figure 1 shown, when the temperature of the slip ring chamber of the water turbine unit is higher than the preset threshold, the voltage output by the drain of PMOS transistor QP has a risk of breaking down the control module. Therefore, the control output terminal 2 of the control module outputs a high level, NPN transistor QN conducts, and starts to pull down, causing the voltage of the detection input terminal 1 of the control module to drop. At the same time, if the temperature continues to rise, the temperature is increased continuously on the basis of the preset threshold temperature value, expanding the temperature measurement range of the temperature measurement circuit and preventing the temperature measurement chip from being broken down by overvoltage.

[0039] When the temperature of the slip ring chamber of the water turbine unit is lower than the preset threshold, the control output terminal 2 of the control module outputs a low level, and the NPN transistor QN is cut off, stopping the pull-down, so that the temperature measurement of the control module is more accurate.

[0040] According to some embodiments, such as Figure 1 As shown, the present application provides a temperature monitoring system for the slip ring chamber of a water turbine unit. The temperature monitoring system includes the temperature measurement circuit and the upper computer described above, and the detection output terminal 3 of the control module is connected to the upper computer.

[0041] Among them, the control module is remotely connected to the upper computer. The upper computer is adopted in the present application, and the temperature of the slip ring chamber of the water turbine unit can be remotely monitored.

[0042] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

[0043] Although the present disclosure has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present disclosure can be embodied in many forms without departing from the spirit or essence of the present application, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be broadly construed within the spirit and scope defined by the appended claims. Therefore, all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A temperature measurement circuit for a slip ring chamber of a hydraulic turbine unit, characterized in that: The temperature measurement circuit comprises: A temperature detection circuit, the temperature detection circuit is arranged on the side wall of the slip ring chamber of the turbine unit, the temperature detection circuit is used to detect the temperature signal of the slip ring chamber of the turbine unit, and convert the temperature signal into an electrical signal for output; A signal amplifying circuit, wherein an input end of the signal amplifying circuit is connected to an output end of the temperature detecting circuit; A pull-down circuit and a control module, wherein the output end of the signal amplifying circuit is connected to the input end of the pull-down circuit and the detection input end of the control module, and the control output end of the control module is connected to the control end of the pull-down circuit; When the detection input terminal of the control module detects that the voltage is higher than a preset threshold, the control module controls the pull-down circuit to increase the pull-down value.

2. The temperature measuring circuit according to claim 1, characterized in that: The temperature detection circuit includes a thermistor and a first resistor, one end of the thermistor is connected to a first power supply, the other end of the thermistor is connected to one end of the first resistor and an input end of the signal amplifying circuit, and the other end of the first resistor is grounded.

3. The temperature measuring circuit according to claim 1, characterized in that: The signal amplification circuit includes a first signal amplification circuit and a second signal amplification circuit. The first signal amplification circuit includes an operational amplifier, a second resistor, a third resistor and a fourth resistor. The in-phase input terminal of the operational amplifier is grounded through the third resistor, the inverting input terminal of the operational amplifier is connected to the output terminal of the temperature detection circuit through the second resistor, the output terminal of the operational amplifier is connected to the inverting input terminal of the operational amplifier through the fourth resistor, the output terminal of the operational amplifier is connected to the input terminal of the second signal amplification circuit, and the output terminal of the second signal amplification circuit is connected to the input terminal of the pull-down circuit and the detection input terminal of the control module.

4. The temperature measuring circuit according to claim 3, characterized in that: The second signal amplifying circuit includes a PMOS tube, a fifth resistor and a sixth resistor, the gate of the PMOS tube is connected to the output end of the operational amplifier through the fifth resistor, the source of the PMOS tube and one end of the sixth resistor are connected to a second power supply, the other end of the sixth resistor is connected to the gate of the PMOS tube, and the drain of the PMOS tube is connected to the input end of the pull-down circuit and the detection input end of the control module.

5. The temperature measuring circuit according to claim 1, characterized in that: The pull-down circuit includes a seventh resistor and an adjustment circuit, one end of the seventh resistor is connected to the output end of the signal amplification circuit, the detection input end of the control module and the input end of the adjustment circuit, the other end of the seventh resistor and the output end of the adjustment circuit are grounded, and the control end of the adjustment circuit is connected to the control output end of the control module.

6. The temperature measuring circuit according to claim 5, characterized in that: The regulation circuit includes an NPN transistor, an eighth resistor, a ninth resistor and a tenth resistor, the collector of the NPN transistor is connected to one end of the eighth resistor, the other end of the eighth resistor is connected to one end of the seventh resistor, the output end of the signal amplification circuit and the detection input end of the control module, the base of the NPN transistor is connected to one end of the ninth resistor and one end of the tenth resistor, the other end of the tenth resistor is connected to the control output end of the control module, and the other end of the ninth resistor and the emitter of the NPN transistor are grounded.

7. The temperature measuring circuit according to claim 6, characterized in that: The temperature measurement circuit also includes an eleventh resistor and a capacitor, one end of the eleventh resistor is connected to one end of the seventh resistor, the output end of the signal amplification circuit and the other end of the eighth resistor, the other end of the eleventh resistor is connected to one end of the capacitor and the detection input end of the control module, and the other end of the capacitor is grounded.

8. A temperature monitoring system for a slip ring chamber of a hydraulic turbine unit, characterized in that: The temperature monitoring system comprises the temperature measurement circuit and a host computer as described in any one of claims 1 to 7, and the detection output end of the control module is connected to the host computer.

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