A calibration device for a four-wire resistance thermometer measuring channel

Abstract

This invention belongs to the field of automated control system technology, specifically relating to a calibration device for a four-wire resistance thermometer (RTD) measurement channel. The invention includes a measuring device, a mobile control terminal, and a production management system. The mobile control terminal is wirelessly connected to both the measuring device and the production management system. The measuring device performs measurements of the pairwise resistance, the four-wire resistance value, and the insulation value to ground of the four-wire RTD, as well as discharge operations. The mobile control terminal records and stores the measurement data from the measuring device. Its connection to the nuclear power plant's production management system allows it to read the collected values ​​and corrected temperature values ​​from the measurement channel, enabling automatic recording and qualification judgment of the channel calibration data. This invention frees workers from mechanical and tedious manual operations and switching between different measuring instruments, improving work efficiency and reducing the risk of human error.

Description

Technical Field

[0001] This invention belongs to the field of automated control system technology, specifically relating to a four-wire thermal resistance measurement channel calibration device. Background Technology

[0002] The resistance temperature detector (RTD) channel of the reactor coolant system in a nuclear power plant is used to directly measure the temperature of the reactor coolant system. When the temperature reaches or exceeds the set value determined by the safety analysis, it generates the control signal necessary to trigger an emergency shutdown and action interlock.

[0003] To ensure that the reactor protection functions determined by the nuclear power plant safety analysis are reliable and clear throughout the entire life cycle of the nuclear power plant, the nuclear power plant needs to periodically perform calibration work on the reactor coolant system temperature measurement channels, and the results are subject to strict supervision by the national nuclear safety regulatory authorities.

[0004] The temperature measurement channel of the reactor coolant system in a nuclear power plant includes 24 four-wire resistance thermometers, their measurement channels, and correction functions. During the calibration of the reactor coolant system temperature measurement channel, it is necessary to measure parameters such as the pairwise resistance, the four-wire resistance value, and the insulation value to ground for each four-wire resistance thermometer, and then read the acquired values ​​and corrected temperature values ​​from the measurement channel.

[0005] Traditional calibration methods for reactor coolant system temperature measurement channels require measuring six pairs of wire resistances for each four-wire heating resistor using a multimeter, measuring one set of four-wire resistance values ​​using a process calibrator, measuring one set of insulation values ​​to ground using a megohmmeter, and reading one set of measurement channel acquisition values ​​and one set of corrected temperature values. This process involves mechanical and cumbersome manual operations and switching between different measuring instruments, posing a significant risk of human error. Summary of the Invention

[0006] The purpose of this invention is to provide a calibration device for a four-wire resistance thermometer, which can free workers from mechanical and tedious manual operation steps and switching between different measuring instruments, thereby improving work efficiency and reducing the risk of human error.

[0007] The technical solution adopted in this invention is as follows:

[0008] A calibration device for a four-wire resistance thermometer (RTD) measurement channel includes a measuring device, a mobile control terminal, and a production management system. The mobile control terminal is wirelessly connected to both the measuring device and the production management system. The measuring device performs measurements of the pairwise resistance, the four-wire resistance value, and the insulation value to ground of the four-wire RTD, as well as discharge operations. The mobile control terminal records and stores the measurement data from the measuring device. The connection between the mobile control terminal and the nuclear power plant's production management system allows it to read the collected values ​​and corrected temperature values ​​from the measurement channel, enabling automatic recording and qualification judgment of the channel calibration data.

[0009] The measuring device includes a main controller, a switch array, terminal blocks, an ohmmeter, an insulation tester, a data storage module, and a wireless communication module. The main controller is connected to the switch array, the ohmmeter, the insulation tester, the data storage module, and the wireless communication module to transmit data.

[0010] The main controller is used to receive instructions from the wireless communication module, call the switch array to complete the selection of measurement channels, call the ohmmeter to complete the measurement of the resistance between each pair of wires and the resistance of the four-wire heating resistor, and call the insulation tester to complete the measurement of the insulation value to ground and the discharge operation after measurement.

[0011] The wireless communication module is used to establish a connection between the measuring device and the mobile control terminal. The wireless communication module is connected to the mobile control terminal, sends the instructions from the mobile control terminal to the main controller, and uploads the measured data to the mobile control terminal.

[0012] The switch array is connected to an ohmmeter and an insulation tester respectively. The switch array receives instructions from the main controller to switch measurement channels to cooperate with the ohmmeter to complete the measurement of the resistance between each pair of wires and the resistance of the four-wire heating resistor, and to cooperate with the insulation tester to complete the measurement of the insulation value to ground and the discharge operation after measurement.

[0013] The ohmmeter receives instructions from the main controller and, with the cooperation of the switch array, completes the measurement of the resistance between each pair of wires and the resistance value of the four-wire heating resistor; the insulation tester receives instructions from the main controller and, with the cooperation of the switch array, completes the measurement of the insulation value to ground and the discharge operation after measurement.

[0014] The data storage module is connected to the wireless communication module. The data storage module caches the data measured by the ohmmeter and insulation tester and uploads it to the mobile control terminal through the wireless communication module.

[0015] The mobile control terminal is an IT terminal with a wireless communication module. It contains main control software for calibrating a four-wire resistance thermometer measurement channel, measurement procedure editing software, production management system interface software, and measurement device interface software. The mobile control terminal's wireless communication module connects to the wireless communication module in the measurement device. The measurement procedure editing software generates measurement procedures and includes a switch array definition table and a procedure editor. The switch array definition table maps the five terminals to the switching control of the switch array and the activation of the ohmmeter and insulation tester. The switch array switching requirements and terminals for each measurement mode are defined. The procedure editor is used to edit the measurement procedures.

[0016] The main control software is used to select the measurement procedure and, according to the step sequence of the measurement procedure, control the measuring device to switch the switch array and measurement mode through the measuring device interface software to complete the required measurement. The measuring device interface software is used to receive instructions from the main control software, control the measuring device to switch the switch array and measurement mode, and read the values ​​measured by the measuring device and write them into the main control software. The production management system interface software is used to read the collected values ​​and corrected temperature values ​​of the measurement channels specified in the measurement procedure from the production management system and write them into the main control software. The main control software records the values ​​measured by the measuring device and the values ​​read by the production management system interface software, completes the qualification judgment according to the definition of the measurement procedure, and generates a calibration report.

[0017] The production management system is a MES system.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] (1) The present invention provides a four-wire heating resistance measurement channel calibration device, which realizes automatic mode switching and measurement of the resistance between two wires, the resistance value of the four wires, and the insulation value to ground of the four-wire heating resistance through a switch array, which simplifies the operation of the four-wire heating resistance channel calibration and optimizes the measurement of 8 sets of data and the switching of 2 types of meters into 1 wiring.

[0020] (2) The present invention provides a four-wire heating resistance measurement channel calibration device, which is connected to a mobile control terminal through a wireless communication module to realize automatic recording and storage of measurement data, avoiding the risk of human error in the process of manual reading and manual input;

[0021] (3) The present invention provides a four-wire heating resistance measurement channel calibration device, which reads the measurement channel acquisition value and the corrected temperature value through the connection of the mobile control terminal with the nuclear power plant production management system, realizes the automatic recording and qualification judgment of the channel calibration data, and generates a strict and standardized test procedure through the measurement procedure editor, which expands the application of this solution and can be used to measure the pairwise resistance, four-wire resistance value and insulation value to ground of any four-wire heating resistance.

[0022] (4) The present invention provides a four-wire thermal resistance measurement channel calibration device, which frees the staff from mechanical and tedious manual operation steps and switching between different measuring instruments, improves work efficiency and reduces the risk of human error. Attached Figure Description

[0023] Figure 1 A simplified architecture diagram of a four-wire resistance heating measurement channel calibration device;

[0024] Figure 2 This is a schematic diagram of the measuring device structure;

[0025] Figure 3 This is a schematic diagram of the mobile control terminal structure. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] This invention provides a calibration device for a four-wire heating resistance measurement channel, such as... Figure 1 As shown, it includes: a measuring device, a mobile control terminal, and a production management system. The mobile control terminal is wirelessly connected to both the measuring device and the production management system. The measuring device performs measurements and discharge operations on data such as the pairwise resistance, the four-wire resistance value, and the insulation value to ground of the four-wire heating resistor. The mobile control terminal records and stores the measurement data from the measuring device. The connection between the mobile control terminal and the nuclear power plant's production management system allows it to read the collected values ​​and corrected temperature values ​​from the measurement channels, enabling automatic recording and qualification judgment of the channel calibration data.

[0030] like Figure 2As shown, the measuring device includes a main controller, a switch array, terminal blocks, an ohmmeter, an insulation tester, a data storage module, and a wireless communication module. The main controller is connected to the switch array, ohmmeter, insulation tester, data storage module, and wireless communication module to transmit data. The main controller receives instructions from the wireless communication module, calls the switch array to select the measurement channel, calls the ohmmeter to measure the pairwise resistance and four-wire resistance of the four-wire heating resistor, and calls the insulation tester to measure the insulation to ground and perform a post-measurement discharge operation. The wireless communication module establishes a connection between the measuring device and the mobile control terminal. The wireless communication module connects to the mobile control terminal, sends instructions from the mobile control terminal to the main controller, and uploads the measured data to the mobile control terminal. The switch array is connected to the ohmmeter and insulation tester respectively. The switch array receives instructions from the main controller to switch measurement channels to cooperate with the ohmmeter in measuring the resistance between each pair of wires and the resistance of the four-wire heating resistor, and to cooperate with the insulation tester in measuring the insulation to ground and performing a discharge operation after measurement. The ohmmeter receives instructions from the main controller and, with the cooperation of the switch array, measures the resistance between each pair of wires and the resistance of the four-wire heating resistor. The insulation tester receives instructions from the main controller and, with the cooperation of the switch array, measures the insulation to ground and performs a discharge operation after measurement. The data storage module is connected to the wireless communication module. The data storage module caches the data measured by the ohmmeter and the insulation tester and uploads it to the mobile control terminal through the wireless communication module. The switch array has 5 terminals, of which terminals a, b, c, and d are used to connect the 4 leads of the 4-wire heating resistor, and terminal e is used to connect to the grounding grid.

[0031] like Figure 3 As shown, the mobile control terminal is an IT terminal with a wireless communication module. Internally, it contains main control software for calibrating the four-wire resistance thermometer measurement channel, measurement procedure editing software, production management system interface software, and measurement device interface software. The mobile control terminal's wireless communication module connects to the wireless communication module in the measurement device. The measurement procedure editing software generates measurement procedures and includes two parts: a switch array definition table and a procedure editor. The switch array definition table maps the five terminals to the switching control of the switch array and the activation of the ohmmeter and insulation tester. The switch array switching requirements and terminals for each measurement mode are defined. The procedure editor edits the measurement procedures, which are in a strictly standardized format. The procedure editor can retrieve data points from the switch array definition table and the production management system. The procedure editor can define the channel number corresponding to the measurement procedure, whether to perform pairwise resistance measurement of the four-wire resistance thermometer, whether to perform four-wire resistance measurement of the four-wire resistance thermometer, whether to perform insulation measurement to ground and discharge operation, etc.

[0032] The main control software is used to select the measurement procedure and, according to the step sequence of the measurement procedure, control the measuring device to switch the switch array and switch the measurement mode through the measuring device interface software to complete the required measurement.

[0033] The measuring device interface software is used to receive instructions from the main control software, control the measuring device to switch the switch array and switch the measurement mode, and read the values ​​measured by the measuring device and write them into the main control software.

[0034] The production management system interface software is used to read the acquired values ​​and corrected temperature values ​​of the measurement channels specified in the measurement procedures from the production management system and write them into the main control software;

[0035] The main control software records the values ​​measured by the measuring device and the values ​​read by the production management system interface software. Based on the definition of the measurement procedure, it completes the qualification judgment and generates a calibration report.

[0036] The production management system is a MES system.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A calibration device for a four-wire resistance thermometer, characterized in that: The system includes a measuring device, a mobile control terminal, and a production management system. The mobile control terminal is wirelessly connected to both the measuring device and the production management system. The measuring device performs measurements of the pairwise resistance, the four-wire resistance value, and the insulation value to ground of the four-wire heating resistor, as well as discharge operations. The mobile control terminal records and stores the measurement data from the measuring device. The connection between the mobile control terminal and the nuclear power plant's production management system allows it to read the collected values ​​and corrected temperature values ​​from the measurement channels, enabling automatic recording and qualification judgment of the channel calibration data. The mobile control terminal is an IT terminal equipped with a first wireless communication module. Internally, it contains main control software for calibrating a four-wire resistance thermometer measurement channel, measurement procedure editing software, production management system interface software, and measurement device interface software. The first wireless communication module of the mobile control terminal is connected to the second wireless communication module in the measurement device. The measurement procedure editing software is used to generate measurement procedures and includes two parts: a switch array definition table and a procedure editor. The switch array definition table maps the five terminals to the switching control of the switch array and the activation of the ohmmeter and insulation tester. The switching requirements and terminals for each measurement mode are defined. The procedure editor is used to edit the measurement procedures. The main control software is used to select the measurement procedure and, according to the step sequence of the measurement procedure, control the measuring device to switch the switch array and measurement mode through the measuring device interface software to complete the required measurement. The measuring device interface software is used to receive instructions from the main control software, control the measuring device to switch the switch array and measurement mode, and read the values ​​measured by the measuring device and write them into the main control software. The production management system interface software is used to read the collected values ​​and corrected temperature values ​​of the measurement channels specified in the measurement procedure from the production management system and write them into the main control software. The main control software records the values ​​measured by the measuring device and the values ​​read by the production management system interface software, completes the qualification judgment according to the definition of the measurement procedure, and generates a calibration report.

2. The calibration device for a four-wire heating resistance measurement channel according to claim 1, characterized in that: The measuring device includes a main controller, a switch array, terminal blocks, an ohmmeter, an insulation tester, a data storage module, and a second wireless communication module. The main controller is connected to the switch array, the ohmmeter, the insulation tester, the data storage module, and the second wireless communication module to transmit data.

3. The calibration device for a four-wire heating resistance measurement channel according to claim 2, characterized in that: The main controller is used to receive instructions from the second wireless communication module, call the switch array to complete the selection of measurement channels, call the ohmmeter to complete the measurement of the resistance between each pair of wires and the resistance of the four-wire heating resistor, and call the insulation tester to complete the measurement of the insulation value to ground and the discharge operation after measurement.

4. The four-wire heating resistance measurement channel calibration device according to claim 3, characterized in that: The second wireless communication module is used to establish a connection between the measuring device and the mobile control terminal. The second wireless communication module is connected to the mobile control terminal, sends the instructions of the mobile control terminal to the main controller, and uploads the measured data to the mobile control terminal.

5. A four-wire heating resistance measurement channel calibration device according to claim 3, characterized in that: The switch array is connected to an ohmmeter and an insulation tester respectively. The switch array receives instructions from the main controller to switch measurement channels to cooperate with the ohmmeter to complete the measurement of the resistance between each pair of wires and the resistance of the four-wire heating resistor, and to cooperate with the insulation tester to complete the measurement of the insulation value to ground and the discharge operation after measurement.

6. A four-wire heating resistance measurement channel calibration device according to claim 5, characterized in that: The ohmmeter receives instructions from the main controller and, with the cooperation of the switch array, completes the measurement of the resistance between each pair of wires and the resistance value of the four-wire heating resistor; the insulation tester receives instructions from the main controller and, with the cooperation of the switch array, completes the measurement of the insulation value to ground and the discharge operation after measurement.

7. A four-wire heating resistance measurement channel calibration device according to claim 3, characterized in that: The data storage module is connected to the second wireless communication module. The data storage module caches the data measured by the ohmmeter and insulation tester and uploads it to the mobile control terminal through the second wireless communication module.

8. A four-wire heating resistance measurement channel calibration device according to claim 1, characterized in that: The production management system is a MES system.

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