A pressurized water nuclear reactor head coil insulation measurement module

Abstract

This invention belongs to the field of nuclear power reactor measurement and control technology, specifically relating to an insulation measurement module for the top coil of a pressurized water nuclear reactor. The main controller is simultaneously connected to a high-voltage module, an impedance measurement circuit, and an LCR module. The input terminal of the high-voltage module is connected to an external power supply, and the output terminal is connected to an external load. The main controller controls the high-voltage module to boost the voltage input from the external power supply. The voltage provided by the external power supply flows through the external load after being boosted by the high-voltage module. The impedance measurement circuit is connected to this external load and processes the current generated on the external load before transmitting it to the main controller. The LCR module is simultaneously connected to another external load. The main controller controls the LCR module to detect this external load and returns the detection results to the main controller through the LCR module. The beneficial effect is that it can achieve comprehensive detection of multiple parameters in the top coil, such as DC resistance and insulation resistance.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power reactor measurement and control technology, specifically relating to an insulation measurement module for the top coil of a pressurized water nuclear reactor. Background Technology

[0002] The Rod Control Group System (RGL system) of a pressurized water nuclear reactor controls the rate of nuclear fission reactions by driving control rods up and down within the reactor core, thereby regulating reactor power and enabling rapid shutdown in emergencies. The RGL system uses magnetic lifters to drive the control rods, and the normal operation of the magnetic lifters depends on stable and reliable electrical insulation performance. However, in actual operation, due to harsh environmental factors such as high temperature, radiation, and humidity, the insulation performance of the RGL system's electrical equipment is prone to degradation or even damage. Once insulation performance is compromised, it may lead to electrical equipment failure, affecting the normal driving of the control rods and thus threatening the safe and stable operation of the reactor. The reactor top coils, consisting of multiple large electromagnetic coils installed on the reactor pressure vessel top cover, are the core components of the magnetic lifters. Therefore, when testing the reactor top coils, both the DC resistance and insulation resistance must be measured simultaneously.

[0003] In existing technologies, the top coil of the RGL system is often tested offline using automated testing devices. However, existing automated testing devices have complex structures, integrating multiple subsystems such as mechanical, electronic, and software components. A failure in any of these components can lead to the paralysis of the entire system, making the device prone to failure and difficult to maintain and diagnose. Summary of the Invention

[0004] The purpose of this invention is to provide an insulation measurement module for the top coil of a pressurized water nuclear reactor, which solves the problems of complex structure and high failure rate of existing automated testing devices.

[0005] The technical solution of the present invention is as follows: an insulation measurement module for the top coil of a pressurized water nuclear reactor, comprising a main controller, a high-voltage module, an impedance measurement circuit, and an LCR module. The main controller is simultaneously connected to the high-voltage module, the impedance measurement circuit, and the LCR module. The input terminal of the high-voltage module is connected to an external power supply, and the output terminal of the high-voltage module is connected to an external load. The main controller controls the high-voltage module to boost the voltage input from the external power supply. The voltage provided by the external power supply flows through the external load after being boosted by the high-voltage module. The impedance measurement circuit is connected to the external load and is used to process the current generated on the external load and transmit it to the main controller. The LCR module is simultaneously connected to another external load. The main controller controls the LCR module to detect the external load and returns the detection result to the main controller through the LCR module.

[0006] The high-voltage module is equipped with an isolation module, a boost module, and a protection circuit connected in sequence. The voltage input from the external power supply flows through the isolation module and then into the boost module. After being boosted by the boost module, the voltage flows out of the high-voltage module through the protection circuit.

[0007] The external power supply is set to a 24V input voltage. After electrical isolation by the isolation module, the boost module increases the 24V voltage to a detection voltage of 24V-1500V according to the instructions of the main controller. When the high voltage module outputs a detection voltage of 500V, the power output by the high voltage module forms a current signal loop through the external load. This current signal is the current to be collected, and the collected current flows into the impedance measurement circuit.

[0008] The impedance measurement circuit includes a current acquisition module and an ADC module. The acquisition current generated on the external load passes through the current acquisition module and the ADC module in sequence. The ADC module converts the voltage signal into a digital signal and transmits it to the main controller.

[0009] The current acquisition module has 10K, 1M and 100M ranges. By selecting different ranges to adjust the current amplification factor, the current acquisition module amplifies the acquired current and converts it into voltage output to the ADC module.

[0010] The current acquisition module is equipped with a Butterworth filter circuit or a 50Hz power frequency filter circuit to filter the acquired current signal.

[0011] The LCR module is equipped with a measurement circuit and a measurement chip. The main controller drives the measurement circuit to detect external loads by controlling the measurement chip.

[0012] It also includes a first switch, a second switch, a self-test circuit, and a DAC module. One end of the first switch is connected to the output terminal of the high-voltage module, and the other end of the first switch is connected to the external load and the self-test circuit respectively. By controlling the first switch, the high-voltage module can be selected to connect to the external load or the self-test circuit. The self-test circuit is also connected to the impedance measurement circuit. One end of the second switch is connected to the main controller, and the other end of the second switch is connected to the DAC module and the LCR module respectively. By controlling the second switch, the main controller can be selected to connect to the DAC module or the LCR module. An external load can be connected to the DAC module, and the external load is also connected to the impedance measurement circuit.

[0013] The beneficial effects of this invention are as follows: This insulation measurement module can detect the insulation resistance of external loads through a high-voltage module and an impedance measurement circuit, and can detect the DC resistance, capacitance, and inductance of external loads through an LCR module, enabling comprehensive detection of multiple parameters such as DC resistance and insulation resistance in the top coil. Furthermore, due to the clear division of labor and collaborative operation of its internal modules, the structure of the detection device is effectively simplified, reducing the risk of failure and avoiding the structural complexity problems caused by the integration of too many subsystems in existing automated detection devices. Simultaneously, in terms of self-testing, the self-test circuit is connected to the impedance measurement circuit, which can promptly detect potential problems within the module itself, ensuring the accuracy and reliability of the test results. In addition, a second switch allows for flexible selection of either a DAC module or an LCR module for connection. Both DAC and LCR modules can detect the DC resistance of external loads, meeting the testing requirements of different external loads and improving the applicability and flexibility of this insulation measurement module. Attached Figure Description

[0014] Figure 1 A schematic diagram of the internal structure of a pressurized water nuclear reactor top coil insulation measurement module provided in the first embodiment of the present invention; Figure 2 A schematic diagram of the internal structure of a pressurized water nuclear reactor top coil insulation measurement module provided in the first embodiment of the present invention; Figure 3 The second embodiment of the present invention provides a schematic diagram of the internal structure of a pressurized water nuclear reactor top coil insulation measurement module. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] like Figure 1 As shown, the first embodiment of the present invention provides an insulation measurement module for the top coil of a pressurized water nuclear reactor. The insulation measurement module includes a main controller, a high-voltage module, an impedance measurement circuit, and an LCR module. The main controller is connected to the high-voltage module, the impedance measurement circuit, and the LCR module simultaneously. The input terminal of the high-voltage module is connected to an external power supply, and the output terminal of the high-voltage module can be connected to an external load. The main controller controls the high-voltage module to boost the voltage input from the external power supply. The voltage provided by the external power supply flows through the external load after being boosted by the high-voltage module. The impedance measurement circuit is connected to this external load and processes the current generated on the external load before transmitting it to the main controller. The LCR module can also be connected to another external load. The main controller controls the LCR module to detect this external load and returns the detection result to the main controller through the LCR module.

[0017] This insulation measurement module, through a high-voltage module and an impedance measurement circuit, can detect the insulation resistance of an external load, and through an LCR module, it can detect the DC resistance, capacitance, and inductance of the external load. In actual operation, when it is necessary to test the stack top coil, the stack top coil is first connected to the insulation measurement module as an external load (the stack top coil has both DC resistance and insulation resistance). The main controller, according to a preset program, controls the high-voltage module to boost the voltage input from the external power supply, so that the boosted voltage flows through the stack top coil. At this time, the impedance measurement circuit collects the current signal generated on the stack top coil and transmits the collected signal to the main controller. The main controller calculates the insulation resistance value of the stack top coil based on the output voltage value and the collected current signal value.

[0018] For the detection of DC resistance, capacitance, and inductance of the stack top coil, the main controller controls the LCR module to connect to the stack top coil. The LCR module detects the stack top coil and returns the detection results to the main controller.

[0019] like Figure 2 As shown, the high-voltage module contains an isolation module, a boost module, and a protection circuit connected in sequence. The voltage input from the external power supply flows through the isolation module and then into the boost module. After being boosted by the boost module, the voltage exits the high-voltage module through the protection circuit. The isolation module electrically isolates the external power supply from the internal circuitry of the high-voltage module, effectively preventing interference and fluctuations from the external power supply from affecting the internal circuitry and improving the stability and reliability of the high-voltage module. The boost module can increase the voltage of the external power supply to the required detection value, ensuring sufficient detection voltage for the external load. Because the insulation resistance is very high, the detection voltage typically needs to be increased to several hundred volts or even thousands of volts. The protection circuit can quickly disconnect the circuit in case of overvoltage, overcurrent, or other abnormal conditions in the high-voltage module, preventing damage to the high-voltage module and the external load and extending the service life of the equipment.

[0020] The external power supply is set to a 24V input voltage. After electrical isolation by the isolation module, the boost module can increase this 24V voltage to a detection voltage of 24V-1500V according to the instructions of the main controller to meet the requirements for detecting the insulation resistance of the stack top coil. For example, when the high-voltage module outputs a 500V detection voltage, this voltage passes through the external load and generates a sampling current. The sampling current flows into the impedance measurement circuit. At this time, the insulation resistance that this insulation measurement module can measure is in the range of 2MΩ-2GΩ, and the corresponding sampling current range is 250nA-250uA.

[0021] The impedance measurement circuit includes a current acquisition module and an ADC module. The current generated by the external load passes through these modules sequentially before being output to the main controller. The current acquisition module accurately acquires the current generated by the external load. Since the current generated by the insulation resistance of the external load is very small, the current acquisition module amplifies and conditions the weak current signal for subsequent processing. The ADC module converts the analog current signal into a digital signal, which the main controller then analyzes and calculates. After receiving the processed digital signal, the main controller calculates the insulation resistance value of the external load according to a preset algorithm and formula.

[0022] The current acquisition module features 10K, 1M, and 100M ranges, allowing adjustment of the current amplification factor. After amplifying the acquired current, the module converts it into a voltage output to the ADC module. Different ranges accommodate varying current magnitudes, improving the accuracy and flexibility of current acquisition. For example, when the current is small, the 100M range can be selected to achieve a higher amplification factor, enabling effective acquisition and processing of weak current signals; conversely, when the current is large, the 10K range can be selected to avoid signal distortion due to over-amplification.

[0023] The current acquisition module can be equipped with a Butterworth filter circuit and a 50Hz power frequency filter circuit to filter the acquired current signal. The Butterworth filter has a maximum flat amplitude characteristic, effectively reducing high-frequency noise in the signal, making the acquired current signal smoother and more stable. The 50Hz power frequency filter circuit suppresses 50Hz power frequency interference, which is quite common and can affect the acquired current signal. This interference can be filtered out by the 50Hz power frequency filter circuit, ensuring the accuracy of the acquired signal.

[0024] The LCR module contains a measurement circuit and a measurement chip. The main controller drives the measurement circuit to detect external loads by controlling the measurement chip. When detecting the top coil, the measurement circuit connects to the top coil, and the measurement chip measures the DC resistance, capacitance, and inductance of the top coil according to the instructions of the main controller. The measurement chip features high precision and high sensitivity; it converts the analog signals acquired by the measurement circuit into digital signals and transmits them to the main controller. After receiving these digital signals, the main controller calculates the various parameter values ​​of the external load based on its built-in algorithms and programs.

[0025] like Figure 3As shown, the second embodiment of the present invention also provides another insulation measurement module. Compared with the insulation measurement module in the first embodiment, the insulation measurement module provided in the second embodiment has the following differences: The insulation measurement module also includes a first switch, a second switch, a self-test circuit, and a DAC module. One end of the first switch is connected to the output terminal of the high-voltage module, and the other end is connected to both an external load and the self-test circuit. By controlling the first switch, the high-voltage module can be selectively connected to either the external load or the self-test circuit, where the self-test circuit is also connected to the impedance measurement circuit. One end of the second switch is connected to the main controller, and the other end is connected to both the DAC module and the LCR module. By controlling the second switch, the main controller can be selectively connected to either the DAC module or the LCR module. An external load can be connected to the DAC module, which is also connected to the impedance measurement circuit. Figure 3 The external loads connected to the impedance measurement circuit, LCR module, and DAC module can be of the same or different types.

[0026] By setting up a first switch and a second switch, the insulation measurement module gains more functions. When a self-test of the insulation measurement module is required, the first switch is controlled to connect the high-voltage module to the self-test circuit. At this time, the high-voltage module boosts the voltage input from the external power supply, and the current passes through the self-test circuit, generating a corresponding signal. This signal is collected and processed by the impedance measurement circuit and transmitted to the main controller. The main controller determines whether the module itself has a fault or performance abnormality based on the received signal. If a problem is detected, timely repair or adjustment can be performed to ensure the accuracy and reliability of the insulation measurement module in subsequent testing operations.

[0027] For the second switch, when the main controller needs to perform different types of detection on the external load, it can select to connect either a DAC module or an LCR module. If the DAC module is selected, the main controller can convert the digital signal from the autonomous controller into an analog voltage signal, apply a voltage to the external load connected to it, and measure the DC resistance. Simultaneously, the current generated by the external load, after being processed by the impedance measurement circuit, will also be fed back to the main controller to assist in completing the detection work. If the LCR module is selected, the DC resistance, capacitance, and inductance of the external load can be detected in the manner described above.

[0028] The design of flexibly switching the connected objects through a switch enables the insulation measurement module to adapt to different testing scenarios and needs while maintaining a simple structure. Even in complex testing tasks, it can ensure the stability and reliability of the entire measurement process.

Claims

1. An insulation measurement module for the top coil of a pressurized water nuclear reactor, characterized in that: The system includes a main controller, a high-voltage module, an impedance measurement circuit, and an LCR module. The main controller is connected to the high-voltage module, the impedance measurement circuit, and the LCR module. The input terminal of the high-voltage module is connected to an external power supply, and the output terminal of the high-voltage module is connected to an external load. The main controller controls the high-voltage module to boost the voltage input from the external power supply. The voltage provided by the external power supply flows through the external load after being boosted by the high-voltage module. The impedance measurement circuit is connected to the external load and is used to process the current generated on the external load and transmit it to the main controller. The LCR module is also connected to another external load. The main controller controls the LCR module to detect the external load and returns the detection result to the main controller through the LCR module.

2. The insulation measurement module for the top coil of a pressurized water nuclear reactor as described in claim 1, characterized in that: The high-voltage module is equipped with an isolation module, a boost module, and a protection circuit connected in sequence. The voltage input from the external power supply flows through the isolation module and then into the boost module. After being boosted by the boost module, the voltage flows out of the high-voltage module through the protection circuit.

3. The insulation measurement module for the top coil of a pressurized water nuclear reactor as described in claim 2, characterized in that: The external power supply is set to a 24V input voltage. After electrical isolation by the isolation module, the boost module increases the 24V voltage to a detection voltage of 24V-1500V according to the instructions of the main controller. When the high voltage module outputs a detection voltage of 500V, the power output by the high voltage module forms a current signal loop through the external load. This current signal is the current to be collected, and the collected current flows into the impedance measurement circuit.

4. The insulation measurement module for the top coil of a pressurized water nuclear reactor as described in claim 1, characterized in that: The impedance measurement circuit includes a current acquisition module and an ADC module. The acquisition current generated on the external load passes through the current acquisition module and the ADC module in sequence. The ADC module converts the voltage signal into a digital signal and transmits it to the main controller.

5. The insulation measurement module for the top coil of a pressurized water nuclear reactor as described in claim 4, characterized in that: The current acquisition module has 10K, 1M and 100M ranges. By selecting different ranges to adjust the current amplification factor, the current acquisition module amplifies the acquired current and converts it into voltage output to the ADC module.

6. The insulation measurement module for the top coil of a pressurized water nuclear reactor as described in claim 4, characterized in that: The current acquisition module is equipped with a Butterworth filter circuit or a 50Hz power frequency filter circuit to filter the acquired current signal.

7. The insulation measurement module for the top coil of a pressurized water nuclear reactor as described in claim 4, characterized in that: The LCR module is equipped with a measurement circuit and a measurement chip. The main controller drives the measurement circuit to detect external loads by controlling the measurement chip.

8. The insulation measurement module for the top coil of a pressurized water nuclear reactor as described in claim 1, characterized in that: It also includes a first switch, a second switch, a self-test circuit, and a DAC module. One end of the first switch is connected to the output terminal of the high-voltage module, and the other end of the first switch is connected to the external load and the self-test circuit respectively. By controlling the first switch, the high-voltage module can be selected to connect to the external load or the self-test circuit. The self-test circuit is also connected to the impedance measurement circuit. One end of the second switch is connected to the main controller, and the other end of the second switch is connected to the DAC module and the LCR module respectively. By controlling the second switch, the main controller can be selected to connect to the DAC module or the LCR module. An external load can be connected to the DAC module, and the external load is also connected to the impedance measurement circuit.

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