A batch testing device for temperature measuring resistance of key parts of a steam turbine

Abstract

The utility model discloses a kind of batch testing device suitable for temperature measurement resistance of key position of power generation machine, the device includes power conversion module, for converting external ac power into dc power;Resistance measurement display module, powered by the dc power, for measuring and showing access resistance resistance value;Lead access module, for accessing temperature measurement resistance lead wire;Switching module, connected between the lead access module and the resistance measurement display module, for the lead wire of the lead access module access is combined switching, to constitute different resistance measurement loop.The problem of long time consumption, high intensity, required manpower in prior art temperature measurement resistance test is solved.

Description

Technical Field

[0001] This utility model relates to the field of testing tooling technology for large-scale hydropower plants, specifically to a batch testing device for temperature resistance of key parts of generators. Background Technology

[0002] In large hydroelectric power plants, turbine generator units undergo major overhauls in rotation. During an overhaul, the temperature measuring resistors of the four bearings (upper guide bearing, lower guide bearing, push guide bearing, and water guide bearing) of the turbine generator are replaced as a preventative measure. A large turbine generator unit often has hundreds of PT100 measuring points, which are distributed throughout various critical parts of the generator.

[0003] Currently, the temperature measurement of the four bearings of a hydro-generator unit is usually done using a three-wire platinum resistance thermometer (PT100). Each temperature-measuring platinum resistance thermometer has a lead wire (one main and one backup) connected to the temperature measurement terminal box. Before replacement, the resistance of each temperature-measuring platinum resistance thermometer needs to be measured and recorded. Therefore, a lot of testing work will be required during the overhaul of the hydro-generator unit or the overall replacement of the resistance.

[0004] Furthermore, the four bearing temperature measuring resistors not only have leads, but are also basically installed in the oil tank and then fixed on the four bearing bushes. Due to the limited space and the presence of other equipment, the temperature measuring resistor body is usually installed before measurement is performed to prevent damage to the temperature measuring resistor leads during installation.

[0005] Traditional methods involve using high-precision multimeters to test each wire individually, which is time-consuming, labor-intensive, and can only test two wires at a time. A single preventative replacement resistance test may require multiple people working for several days, extending the project timeline and increasing unit downtime costs. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a batch testing device for temperature resistance measurement in key parts of generators, in order to solve the problems of long testing time, high intensity and large manpower required in the existing technology for temperature resistance measurement.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: According to one aspect of this application, a batch testing device for temperature-measuring resistance of key components of a generator is provided, comprising: A power conversion module is used to convert external AC power into DC power. The resistance measurement and display module, powered by the DC power supply, is used to measure and display the resistance value of the connected resistor; Lead wire connection module, used to connect the temperature sensing resistor lead wire; An adapter module is connected between the lead wire access module and the resistance measurement and display module, and is used to combine and connect the leads connected to the lead wire access module to form different resistance measurement circuits.

[0008] The device provided in this application, with its modular design integrating power conversion, lead connection, loop conversion, and measurement display, fundamentally changes the traditional single-point testing mode of multimeters. It achieves integrated and batch operation of the testing process, significantly reducing pre-test preparation time and the complexity of connecting different devices, providing a foundation for large-scale batch testing and greatly improving overall testing efficiency.

[0009] A further technical solution includes an anomaly detection module, which is used to reject connection resistors that do not meet preset conditions. This anomaly detection module makes testing more intelligent, directly informing testing personnel of defective products for timely replacement and improving the efficiency of maintenance work.

[0010] A further technical solution is that the anomaly detection module includes a storage module, a judgment module, and an alarm module. The storage module acquires the resistance value data displayed by the resistance measurement and display module and transmits the resistance value data to the judgment module. The judgment module compares the resistance value data with preset qualified resistance value data and transmits the judgment result to the alarm module. The alarm module can promptly send non-compliant data prompts to the testers, preventing human calculation errors caused by testers visually measuring data and then calculating to find abnormal resistances. The alarm module is a buzzer or warning light.

[0011] A further technical solution is that, since the lead connection module uses spring terminals, the insertion and removal operations are faster and less strenuous compared to traditional screw terminals, enabling rapid connection and disconnection of test leads, further reducing operational intensity and shortening the test cycle of a single resistor. This is particularly suitable for batch testing scenarios that require frequent lead replacement.

[0012] A further technical solution is that the adapter module is a terminal block, which is provided with multiple sets of configurable shorting elements. Different resistance measurement circuits can be formed by configuring these shorting elements. Because the adapter module uses a terminal block with shorting elements, such as an RTD terminal block with pairs of shorted elements, it provides extremely high testing flexibility.

[0013] A further technical solution is that the terminal block is an RTD adapter terminal block, with the terminals of the RTD adapter terminal block shorted in pairs via jumper tabs. The use of a high-precision (0.5%) LCD digital display resistance tester ensures the accuracy and intuitiveness of the measurement results, providing clear readings and enabling quick determination of whether the resistance value of the temperature measuring resistor is within the acceptable range, thus ensuring the quality of equipment maintenance.

[0014] A further technical solution is that the resistance measurement display module is an LCD digital display resistance tester with a measurement range of 0-200Ω and a measurement accuracy of not less than 0.5%. The use of a high-precision (0.5%) LCD digital display resistance tester ensures the accuracy and intuitiveness of the measurement results, providing clear readings and enabling quick determination of whether the resistance value of the temperature-measuring resistor is within the acceptable range, thus ensuring the quality of equipment maintenance.

[0015] A further technical solution is that the power conversion module is an AC / DC power module, used to convert 220V AC power to 24V DC power, thereby improving operational safety.

[0016] A further technical solution includes a power adapter terminal block for connecting the output of the power conversion module to the power input of the resistance measurement and display module. By employing an independent AC / DC power module and power adapter terminal block, a stable and clean DC power supply is provided to the measuring instrument, effectively avoiding the impact of AC power fluctuations on measurement accuracy. Simultaneously, the standardized power wiring and good isolation enhance operational safety.

[0017] A further technical solution is that the power adapter terminal block is provided with an insulating partition to separate the positive and negative terminals on the power adapter terminal block.

[0018] Another aspect of this application is to provide a method for batch testing of temperature resistance using any of the devices described in this application, comprising the following steps: Power-on procedure: Connect the device to an external AC power source; Lead wire connection steps: Connect the lead wire of the temperature measuring resistor to be tested to the lead wire connection module; Circuit configuration and measurement steps: Configure the measurement circuit through the adapter module and read the resistance value of the current measurement circuit on the resistance measurement display module; Cyclic testing steps: After completing the test of the current temperature measuring resistor, remove the lead of the temperature measuring resistor to be tested from the lead connection module, connect the lead of the next temperature measuring resistor to be tested, and repeat the above steps.

[0019] By employing the testing method described above, the complex resistance testing process is streamlined and standardized. Operators only need to follow the steps of "power-on - connection - configuration / reading - switching" to complete all tests, reducing reliance on operator skill levels, minimizing the possibility of human error, and ensuring the efficiency and reliability of the testing process.

[0020] In the above method, configuring the measurement circuit via the adapter module includes: setting configurable shorting elements on the terminal blocks of the adapter module, and configuring the shorting elements to form different resistance measurement circuits. Because this method utilizes the adapter module to perform multiple tests "without a fixed wiring sequence," it further streamlines the operation process, avoids errors caused by memorizing or executing complex wiring sequences, and truly achieves fast, error-free batch testing.

[0021] Furthermore, it includes an anomaly detection step, which is used to remove access resistors that do not meet preset conditions. Adding records of qualified and unqualified test data forms a closed-loop management of the testing work, ensuring the traceability of data at each measurement point and providing data support for equipment condition-based maintenance.

[0022] The beneficial effects that the batch testing device and method for measuring temperature resistance in key parts of generators disclosed in this application may bring include, but are not limited to: 1. Integrated device structure: The device provided in this application adopts a modular design that integrates power conversion, lead connection, circuit conversion and measurement display, which simplifies the test wiring process, reduces manual operation, and reduces the risk of wiring errors.

[0023] 2. High operational safety: By reducing the amount of manual wiring work and isolating the power supply from the wiring, the safety of personnel operation is ensured.

[0024] 3. Good portability: The device is small in size and has a light weight, making it suitable for operations in various small spaces and meeting the needs of on-site measurement of temperature resistance of four bearings.

[0025] 4. High detection accuracy: The device of this application can directly feed back the test results (pass or fail) to the testers, avoiding errors caused by human calculation; and it has a certain degree of intelligence. Attached Figure Description

[0026] Figure 1 A schematic diagram of a batch testing device for temperature measuring resistance of key parts of a generator, according to an embodiment of this application, is shown. Figure 2 This diagram illustrates the principle of a batch testing device for temperature-measuring resistance of key components of a generator, according to an embodiment of this application. Figure 3 This invention relates to a schematic diagram (with an anomaly detection module) of a batch testing device for temperature measuring resistors in key parts of generators, according to an embodiment of this application. Figure 4 This diagram illustrates a batch testing device with an anomaly detection module for temperature measuring resistors in critical parts of generators, according to an embodiment of this application.

[0027] Diagram description: 1-LCD digital display resistance tester, 2-Spring terminal, 3-RID adapter terminal block, 4-Power module, 5-Power adapter terminal block, 6-Lead A, 7-Lead B, 8-Lead C, 9-First LCD digital display resistance tester, 10-Second LCD digital display resistance tester, 11-Third LCD digital display resistance tester, 12-Abnormal detection module. Detailed Implementation

[0028] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0029] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] The batch testing device and method for temperature measuring resistance of key parts of generators provided by this utility model can be applied to the measurement of temperature measuring resistance of key parts of generators in large hydropower stations. In fact, the batch testing device and method for temperature measuring resistance of key parts of generators can also be applied to the measurement of three-wire platinum resistance thermometers (PT100) in applicable scenarios such as thermal power plants, medical equipment, automotive monitoring, and aerospace.

[0031] Figure 1 A schematic diagram of a batch testing device for temperature measuring resistance of key parts of a generator, according to an embodiment of this application, is shown. Figure 2 This diagram illustrates the principle of a batch testing device for temperature-measuring resistance of key components of a generator, according to an embodiment of this application. Figure 3This invention relates to a schematic diagram (with an anomaly detection module) of a batch testing device for temperature measuring resistors in key parts of generators, according to an embodiment of this application. Figure 4 This diagram illustrates a batch testing device with an anomaly detection module for temperature measuring resistors in critical parts of generators, according to an embodiment of this application.

[0032] like Figure 1-2 As shown, a batch testing device for temperature-measuring resistors in key parts of generators includes: a power conversion module, a resistance measurement and display module, a lead wire connection module, and an adapter module. The power conversion module converts external AC power to DC power; the resistance measurement and display module is powered by the DC power supply and measures and displays the resistance value of the connected resistor; the lead wire connection module connects the temperature-measuring resistor leads; and the adapter module connects the lead wire connection module and the resistance measurement and display module to combine and connect the leads connected to the lead wire connection module to form different resistance measurement circuits.

[0033] All of the above modules of the batch testing device for temperature measuring resistance of key parts of generators can be integrated into a portable engineering plastic enclosure with an IP54 protection rating.

[0034] In some embodiments, the power conversion module is mainly used to convert AC power to DC power. It can be an industrial-grade switching power supply module 4 with an input of AC 220V and an output of DC 24V / 2A. A 0.1μF filter capacitor is connected in parallel at its output terminal to ensure the stability of the output DC power.

[0035] In some embodiments, to better accommodate the simultaneous display of three resistance measurement display modules, this embodiment also includes a power adapter terminal block 5 for connecting the output terminal of the power conversion module to the power input terminal of the resistance measurement display module. For testing safety, the power adapter terminal block 5 is provided with an insulating partition to separate the positive and negative terminals on the power adapter terminal block 5.

[0036] The use of independent AC / DC power modules 4 and power adapter terminal blocks 5 provides a stable DC power supply for the measuring instruments, effectively avoiding the impact of AC power fluctuations on measurement accuracy. At the same time, the power wiring is standardized and well isolated, improving operational safety.

[0037] In some embodiments, the resistance measurement display module can be a 4.5-digit LCD digital display resistance tester 1, preferably one with three-wire measurement capability. Its measurement range is 0-200Ω, and the measurement accuracy is not less than 0.5%. The use of a high-precision LCD digital display resistance tester 1 ensures the accuracy and intuitiveness of the measurement results, providing clear readings and enabling quick determination of whether the resistance value of the temperature-measuring resistor is within the acceptable range, thus ensuring the quality of equipment maintenance. The power input terminal of this instrument is connected to the power adapter terminal block 5 via a wire.

[0038] In some embodiments, the lead wire access module is a spring terminal 2. The use of spring terminal 2 in the lead wire access module can achieve insertion and removal more quickly. Compared with traditional screw terminals, the insertion and removal operation is faster and less strenuous, realizing the rapid connection and disconnection of test leads, further reducing the operational intensity, shortening the test cycle of a single resistor, and is particularly suitable for batch testing scenarios that require frequent wire replacement.

[0039] In some embodiments, the adapter module is a terminal block with multiple configurable shorting elements. Different resistance measurement circuits can be constructed by configuring these shorting elements. Because the adapter module uses a terminal block with shorting elements, such as an RTD terminal block with pairs of shorted elements, it provides extremely high testing flexibility. Different circuits can be flexibly configured to measure the main resistance, spare resistance, or check lead continuity without disconnecting the leads. This capability supports the overarching concept of "constructing different resistance measurement circuits" and avoids repeated disconnection and reconnection of wires.

[0040] For example, the terminal block uses a row of high-density RTD adapter terminal blocks 3, such as model JH-5.08-20P. Each terminal block has two terminals grouped together, and each group is internally connected via pluggable copper shorting tabs. The input terminal of this terminal block is connected to the corresponding circuit of the spring terminal 2 via a wire, while the output terminal is connected to the resistance measurement input terminals (S+ and S-) of the LCD digital display resistance tester 1 via a test wire.

[0041] The device provided in this application integrates a power conversion module, a resistance measurement and display module, a lead connection module, and an adapter module into a portable engineering plastic or metal chassis with at least an IP54 waterproof rating. This device fundamentally changes the traditional single-point testing mode of multimeters. It realizes integrated and batch operation of the testing process, significantly reduces preparation time before testing and the cumbersome connection between different devices, provides a foundation for large-scale batch testing, and greatly improves overall testing efficiency.

[0042] like Figure 1 and 3As shown, in some embodiments, the testing device further includes an anomaly detection module 12, which is connected to the LCD digital display resistance tester 1 for automatic determination of whether the resistance value of the temperature measuring resistor is qualified and to issue a warning. The anomaly detection module 12 is used to reject connected resistors that do not meet preset conditions. The anomaly detection module 12 makes the testing more intelligent, directly informing the testing personnel of unqualified products for rejection and timely replacement, thus improving the efficiency of maintenance work.

[0043] For example, the anomaly detection module 12 can be an integrated microcontroller (MCU), such as the STM32 series. Its built-in ADC (analog-to-digital converter) directly acquires the analog voltage signal from the LCD instrument's measurement terminal through a sampling circuit, then calculates and converts it into a resistance value, compares it with a threshold value stored in FLASH, and finally drives an LED and a buzzer through the GPIO port.

[0044] For example, the anomaly detection module 12 can be constructed using a comparator chip (such as LM393) and a precision potentiometer. The output signal of the LCD instrument (representing the resistance value) is connected to one end of the comparator, and a threshold voltage is set at the other end by the potentiometer. When the input signal exceeds the limit, the comparator output level flips, driving a transistor to activate the audible and visual alarm circuit.

[0045] "Data connection" includes, but is not limited to: directly acquiring analog signals from the instrument input terminal, reading digital outputs from the instrument via a serial port (UART), or reading values ​​from the LCD screen via image recognition. Any method that enables data acquisition falls within the scope of this protection.

[0046] This embodiment not only solves the problem of low testing efficiency, but also addresses the issue of fatigue or calculation errors that can easily occur during manual testing, leading to incorrect judgments of defective products. The anomaly detection module 12 detects and alerts users to defective connection resistors, significantly reducing the risk of human error in judging defective products.

[0047] like Figure 4 As shown, in some embodiments, the anomaly detection module 12 includes a storage module, a judgment module, and an alarm module. The storage module is used to acquire and temporarily store the resistance value data displayed by the resistance measurement and display module in real time. This module can be implemented based on non-volatile memory (such as EEPROM or Flash) to ensure that the data is not lost after power failure.

[0048] The judgment module is connected to the storage module, and it pre-stores the acceptable resistance range data of the PT100 temperature measuring resistor; for example, the standard resistance value at 0°C is 100.00Ω, and the acceptable range can be preset to 99.80Ω - 100.20Ω. This module is used to automatically compare the real-time resistance data transmitted from the storage module with the preset acceptable range and generate a judgment result ("acceptable" or "unacceptable").

[0049] The alarm module is connected to the judgment module and is used to receive the judgment result. When the judgment result is "unqualified", the module immediately activates the acoustic and / or optical alarm to alert the tester.

[0050] The alarm module can promptly send non-compliant data alerts to testers, preventing human error caused by testers relying on visual measurement data and then calculating and judging to find abnormal resistance.

[0051] Another aspect of this application is to provide a method for batch testing of temperature-measuring resistors using any of the above-mentioned devices. Taking the testing of a three-wire PT100 resistor as an example, the method for testing using the above-mentioned device includes the following steps: Powering on the device: Since the device is designed with a standard plug, it is compatible with the maintenance power box and power supply panel. Connect the device's power plug to the AC 220V socket of the maintenance power box. At this time, the AC / DC power module 4 will work and output DC 24V. The LCD digital display resistance test instrument 1 will be powered on and in standby mode.

[0052] Lead connection: Insert the three leads (A, B, C) of the PT100 resistor to be tested into any three adjacent terminals of spring terminal 2, and press the spring button to lock the cables.

[0053] Circuit Configuration and Measurement Steps: Measuring the Main Resistance (AB): On the RTD adapter terminal block 3, locate the two terminals corresponding to leads A6 and B7, which are shorted by the jumper. At this point, the circuit is connected, and the resistance value displayed on the first LCD digital resistance tester 9 is the resistance value of the PT100 main circuit (including lead resistance). Record this value, Rab.

[0054] Measuring the backup resistor (AC): On RTD adapter terminal block 3, locate the two terminals corresponding to leads A6 and C8, which are shorted by the jumper. At this point, the circuit is connected, and the resistance value displayed on the second LCD digital resistance tester 10 is the resistance value of the PT100 backup circuit (including lead resistance). Record this value, Rac.

[0055] Check the leads (BC): On RTD adapter terminal block 3, locate the terminals corresponding to leads B7 and C8, which are shorted by the jumper. Theoretically, a very small resistance (approaching 0Ω) should be measured at this point. If the third LCD digital resistance tester 11 displays "Overrange (OL)," it indicates an open circuit in the leads; if it displays a large resistance value, the leads may be incorrectly connected or short-circuited. This step verifies the integrity of the leads themselves.

[0056] Cyclic test steps: After completing the test of the current temperature measuring resistor, remove the lead of the temperature measuring resistor to be tested from the lead connection module, connect the lead of the next temperature measuring resistor to be tested, and repeat the above steps.

[0057] By employing the aforementioned testing method, the complex resistance testing process is streamlined and standardized. Operators only need to follow the "power-on-connect-read-switch" cycle to complete all tests, reducing reliance on operator skill levels, minimizing the possibility of human error, and ensuring the efficiency and reliability of the testing process.

[0058] In the above method, configuring the measurement circuit via the adapter module includes: setting configurable shorting devices on the terminal blocks of the adapter module, and configuring the shorting devices to form different resistance measurement circuits. Because this method utilizes the adapter module to perform multiple tests "without a fixed wiring sequence," it further streamlines the operation process, avoids errors caused by memorizing or executing complex wiring sequences, and truly achieves fast, error-free batch testing.

[0059] In some embodiments, an anomaly detection step is also included, which is used to remove access resistors that do not meet preset conditions. Adding records of qualified and unqualified test data forms a closed-loop management of the testing work, ensuring the traceability of data at each measurement point and providing data support for equipment condition-based maintenance.

[0060] Specifically, the anomaly detection step is implemented through the anomaly detection module 12. After the data is displayed on each LCD digital display resistance tester 1, the storage module of the anomaly detection module 12 automatically retrieves the resistance value data, and the judgment module compares it with the preset acceptable range. If the resistance value is within the acceptable range, the alarm module remains silent; if the resistance value is out of tolerance (too high, too low, or open circuit), the alarm module immediately activates (e.g., a red light illuminates and a buzzer sounds), directly reporting the resistance anomaly to the tester.

[0061] Operators record the data in the test form based on the alarm prompts and instrument displays, and the test points that trigger alarms should be marked.

[0062] The beneficial effects of this embodiment are as follows: 1. Strong intelligence and error prevention capabilities: By integrating the anomaly detection module 12, automatic interpretation and immediate alarm of measurement results are achieved. This completely avoids omissions, misjudgments, and calculation errors that may be caused by manual reading, mental calculation, or table comparison, greatly improving the accuracy and reliability of test results and ensuring the quality of unit maintenance.

[0063] 2. Further improve testing efficiency: Testers no longer need to focus on checking the instrument's specific values ​​and performing calculations after each measurement. They can quickly make a "pass / fail" judgment simply by listening to the sound or looking at the indicator light. Their attention can be more focused on wiring operations, further accelerating the overall pace of batch testing.

[0064] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A batch testing device for temperature resistance measurement of key components of a generator, characterized in that, include: A power conversion module is used to convert external AC power into DC power. The resistance measurement and display module, powered by the DC power supply, is used to measure and display the resistance value of the connected resistor; Lead wire connection module, used to connect the temperature sensing resistor lead wire; An adapter module is connected between the lead wire access module and the resistance measurement and display module, and is used to combine and connect the leads connected to the lead wire access module to form different resistance measurement circuits.

2. The apparatus according to claim 1, characterized in that, It also includes an anomaly detection module (12), which is used to remove access resistors that do not meet the preset conditions.

3. The apparatus according to claim 2, characterized in that, The anomaly detection module (12) includes a storage module, a judgment module and an alarm module. The storage module is used to acquire the resistance value data of the connected resistor displayed by the resistance measurement display module and transmit the resistance value data to the judgment module. The judgment module is used to compare the resistance value data with the preset qualified resistance value data and transmit the judgment result to the alarm module.

4. The apparatus according to claim 3, characterized in that, The alarm module is a buzzer or a warning light.

5. The apparatus according to any one of claims 1-4, characterized in that, The adapter module is a terminal block, which is provided with multiple sets of configurable shorting devices. Different resistance measurement circuits can be formed by configuring the shorting devices.

6. The apparatus according to claim 5, characterized in that, The terminal block is an RTD adapter terminal block (3), and the terminals of the RTD adapter terminal block (3) are shorted in pairs by shorting tabs.

7. The apparatus according to any one of claims 1-4, characterized in that, The lead wire connection module is a spring terminal (2).

8. The apparatus according to claim 1, characterized in that, It also includes a power adapter terminal block (5) for connecting the output terminal of the power conversion module to the power input terminal of the resistance measurement and display module.

9. The apparatus according to claim 8, characterized in that, The power adapter terminal block (5) is provided with an insulating partition to separate the positive and negative terminals on the power adapter terminal block (5).

10. The apparatus according to claim 1, characterized in that, The resistance measurement display module is an LCD digital display resistance tester (1), with a measurement range of 0-200Ω and a measurement accuracy of not less than 0.5%.

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