Calibration circuit and device for protector of nuclear power submersible pump
By constructing a verification circuit for the nuclear power plant submersible pump protector, providing abnormal operating conditions and measuring current, and outputting indication signals, the problem of the inability to provide timely early warning of protector damage in nuclear power plants is solved, and the effective verification and abnormal detection of the protector function are realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TAISHAN NUCLEAR POWER JOINT VENTURE CO LTD
- Filing Date
- 2025-03-17
- Publication Date
- 2026-04-21
AI Technical Summary
Damage to the nuclear power plant submersible pump protector can lead to the inability to provide timely warnings of malfunctions, making it difficult for staff to detect and address abnormalities promptly. There is also a lack of effective methods or equipment to verify whether the protector is functioning properly.
A verification circuit for a nuclear power plant submersible pump protector is constructed, comprising a three-phase power supply module, a sampling module, a processing module, an indicator module, and a power supply module. The three-phase power supply module provides abnormal operating conditions, the sampling module measures the current, the processing module outputs indicator control commands, the indicator module displays the abnormality type, and the power supply module provides power support.
The system verifies whether the protector functions properly. The circuit structure is simple and easy to operate, ensuring that the abnormal detection and alarm functions of the nuclear power plant submersible pump protector are normal.
Smart Images
Figure CN224152572U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of nuclear power plant equipment technology, and in particular to a verification circuit and device for a nuclear power submersible pump protector. Background Technology
[0002] Submersible pumps are widely used equipment in nuclear power plants. Taking an EPR unit as an example, the entire plant has a total of 365 submersible pumps. To ensure the normal functioning of these pumps, each pump is typically equipped with a protector. The protector's function is to monitor for faults such as phase loss and to promptly output a warning signal when a fault is detected, notifying personnel to handle the fault as quickly as possible and ensuring the safety of the nuclear power plant. However, in nuclear power plants, incidents occasionally occur where protector failure prevents timely warnings of submersible pump malfunctions, hindering personnel from promptly detecting and addressing abnormalities. Therefore, nuclear power plants urgently need a solution or equipment to verify the normal functioning of these protectors. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a verification circuit for a nuclear power submersible pump protector.
[0004] The technical solution adopted by this utility model to solve its technical problem is: constructing a verification circuit for a nuclear power plant submersible pump protector, including:
[0005] A three-phase power supply module for connecting a nuclear power plant submersible pump under test to induce abnormal operating conditions in the pump by controlling the output current of each phase; wherein, the abnormal operating conditions include phase loss, overload, fault, and leakage;
[0006] A sampling module for measuring the three-phase current output by the three-phase power supply module;
[0007] A processing module connected to the sampling module for receiving the three-phase current and outputting indication and control commands;
[0008] An indicator module connected to the processing module, used to receive the indicator control command and output an indicator signal capable of displaying the type of abnormal operating condition; and
[0009] A power supply module connected to the processing module for supplying power to the processing module.
[0010] Preferably, it further includes a simulated leakage module connected to the processing module for outputting simulated leakage signals.
[0011] Preferably, the nuclear power submersible pump protector verification circuit further includes a reset module connected to the processing module for outputting a reset signal.
[0012] Preferably, the reset module and the simulated leakage module each include a normally closed switch.
[0013] Preferably, the indicating module includes:
[0014] A phase loss indicator light is connected to the processing module;
[0015] Overload indicator light connected to the processing module;
[0016] A fault indicator light connected to the processing module; and
[0017] A leakage indicator light connected to the processing module.
[0018] Preferably, the sampling module includes a three-phase current transformer for coupling with the three-phase power supply module to measure the three-phase current.
[0019] Preferably, the power supply module includes:
[0020] An AD-DC conversion unit used to connect to a power supply and output DC power;
[0021] A current-limiting protector connected to the AD-DC conversion unit; and
[0022] A power output control switch is connected between the positive output terminal of the current limiting protector and the power supply terminal of the processing module.
[0023] Preferably, the power supply module further includes:
[0024] A power input control switch connected to the AD-DC conversion unit and used to connect the power supply to control the on / off connection between the power supply and the AD-DC conversion unit;
[0025] A module power supply control switch connected between the power output control switch and the processing module;
[0026] A power indicator light is connected to the connection node of the power output control switch and the module power supply control switch to indicate whether the DC power supply is outputting normally.
[0027] Preferably, the power input control switch is a circuit breaker, and the power output control switch and the module power supply control switch are normally open switches.
[0028] In addition, this utility model also constructs a nuclear power submersible pump protector calibration device, including the nuclear power submersible pump protector calibration circuit described above.
[0029] The present invention provides the following advantages: a verification circuit for a nuclear power submersible pump protector is provided. A three-phase power supply module provides the nuclear power submersible pump under test with a three-phase power supply that can induce abnormal operating conditions. A sampling module measures the three-phase current output by the three-phase power supply module. Then, a processing module outputs an indication control command based on the three-phase current to an indication module, enabling the indication module to output a corresponding indication signal based on the type of abnormal operating condition. This allows operators to verify the normal functioning of the protector by comparing the type of abnormal operating condition represented by the indication signal with the warning signal output by the nuclear power submersible pump protector. Furthermore, the present invention has the advantages of simple circuit structure and convenient operation. Attached Figure Description
[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:
[0031] Figure 1 This is a circuit structure block diagram of the nuclear power submersible pump protector verification circuit in some embodiments of this utility model;
[0032] Figure 2 This is a circuit diagram of the verification circuit for the nuclear power submersible pump protector in some embodiments of this utility model. Detailed Implementation
[0033] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0034] In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "up," "down," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0035] Figure 1 This is a circuit structure block diagram of a nuclear power plant submersible pump protector verification circuit in some embodiments of this utility model. This nuclear power plant submersible pump protector verification circuit is used to verify whether the protector functions normally.
[0036] Please see Figure 1 The nuclear power submersible pump protector calibration circuit may include a three-phase power supply module 1, a sampling module 2, a processing module 3, an indicator module 4, and a power supply module 5.
[0037] The three-phase power module 1 is used to connect to the nuclear power submersible pump under test, so as to induce abnormal operating conditions in the pump by controlling the output current of each phase. These abnormal operating conditions include, but are not limited to, phase loss, overload, fault, and leakage. Specifically, the three-phase power module 1 can be an existing three-phase AC power supply capable of controlling the output current of each phase according to operation. Understandably, operators can operate the three-phase AC power supply as needed to induce abnormal operating conditions such as phase loss, overload, fault, and leakage in the nuclear power submersible pump under test. For example, setting the output current of one phase to be significantly less than (or even zero) the input current of the other two phases can simulate a phase loss condition; setting the output current of each phase to be greater than the overload current threshold of the nuclear power submersible pump under test can simulate an overload condition; setting the output current of at least two phases to zero can simulate a phase-to-phase short circuit; setting the output current of a phase to be significantly less than the rated operating current of the nuclear power submersible pump under test, such as an output current of 50% to 80% of the rated operating current, can simulate a leakage condition.
[0038] Sampling module 2 is used to measure the three-phase current output by three-phase power supply module 1.
[0039] In some embodiments, the sampling module 2 may include a three-phase current transformer for coupling with the three-phase power module 1 to measure the three-phase current. The three-phase current transformer may consist of three independent current transformers, capable of measuring the magnitude of the A-phase, B-phase, and C-phase currents input to the nuclear power submersible pump under test, and transmitting the measured three-phase currents to the processing module 3.
[0040] Processing module 3 is connected to sampling module 2 and simulated leakage module 6. Processing module 3 receives the three-phase current output from sampling module 2 and outputs indication control commands. Specifically, processing module 3 may include a PLC controller. Processing module 3 can determine whether the nuclear power plant submersible pump under test is experiencing phase loss, overload, fault, or leakage based on the three-phase current, and then outputs corresponding indication control commands to indication module 4. It should be noted that the PLC controller determines whether the nuclear power plant submersible pump under test is experiencing phase loss, overload, fault, or leakage by executing a phase-specific algorithm, such as executing a computer program in a protector to determine whether abnormal operating conditions have occurred.
[0041] The indicator module 4 is connected to the processing module 3. The indicator module 4 is used to receive indicator control commands and output indicator signals that can display the type of abnormal operating condition. Specifically, the indicator module 4 will output corresponding indicator signals according to the control commands to display what abnormal operating condition the nuclear power plant submersible pump under test is experiencing.
[0042] In some embodiments, such as Figure 2 As shown, the indicator module 4 may include a phase loss indicator D1, an overload indicator D2, a fault indicator D3, and a leakage indicator D4.
[0043] The phase loss indicator D1 is connected between the processing module 3 and the negative terminal of the DC power supply. When a phase loss occurs in the nuclear power submersible pump under test, the processing module 3 outputs a corresponding control command to illuminate the phase loss indicator D1. Furthermore, if the protector of the nuclear power submersible pump under test also outputs a phase loss warning signal, it indicates that the phase loss detection and phase loss alarm functions of the protector are normal.
[0044] The overload indicator D2 is connected between the processing module 3 and the negative terminal of the DC power supply. When the nuclear power submersible pump under test experiences an overload, the processing module 3 outputs a corresponding control command to illuminate the overload indicator D2. Furthermore, if the protector of the nuclear power submersible pump under test also outputs an overload warning signal, it indicates that the overload detection and overload alarm functions of the protector are normal.
[0045] The fault indicator D3 is connected between the processing module 3 and the negative terminal of the DC power supply. When a short circuit fault occurs in the nuclear power submersible pump under test, the processing module 3 outputs a corresponding control command to illuminate the fault indicator D3. Furthermore, if the protector of the nuclear power submersible pump under test also outputs a fault indication signal, it indicates that the fault detection and fault alarm functions of the protector are normal.
[0046] The leakage indicator D4 is connected between the processing module 3 and the negative terminal of the DC power supply. When the nuclear power submersible pump under test experiences a leakage abnormality, the processing module 3 outputs a corresponding control command to illuminate the leakage indicator D4. Furthermore, if the protector of the nuclear power submersible pump under test also outputs a leakage warning signal, it indicates that the leak detection and leakage alarm functions of the protector are normal.
[0047] The power supply module 5 is connected to the processing module 3, and the power supply module 5 is used to supply power to the processing module 3. Specifically, the main function of the power supply module 5 is to convert the power supply (such as mains power) into a low-voltage DC power supply to power the processing module 3.
[0048] In some embodiments, such as Figure 2 As shown, the power supply module 5 may include an AD-DC conversion unit T1, a current limiting protector, and a control switch K2.
[0049] The AD-DC conversion unit T1 is used to connect to a power supply (such as AC mains power) to convert the power supply into DC power (20VDC) for output. The AD-DC conversion unit T1 can be an existing AC-DC power module or an existing switching power supply module that can convert 220V AC power to approximately 20V DC power; no specific limitation is made here.
[0050] The current limiting protector is connected to the AD-DC conversion unit T1. Specifically, the current limiting protector may include a first fuse FU1 and a second fuse FU2. The first terminal of the first fuse FU1 is connected to the positive DC output of the AD-DC conversion unit T1, and the second terminal of the first fuse FU1 corresponds to the positive output terminal of the current limiting protector. The first terminal of the second fuse FU2 is connected to the negative DC output of the AD-DC conversion unit T1, and the second terminal of the second fuse FU2 corresponds to the negative DC output of the AD-DC conversion unit T1 (equivalent to the negative terminal of the DC power supply).
[0051] The power output control switch K2 is connected between the positive output terminal of the current limiting protector and the power supply terminal of the processing module 3 (pin 9 of the processing module 3). The power output control switch K2 can control the connection and disconnection between the positive output terminal of the current limiting protector and the power supply terminal of the processing module 3. The power output control switch K2 can be a conventional normally open switch.
[0052] Furthermore, in some embodiments, such as Figure 2 As shown, the power supply module 5 may also include a power input control switch K1, a module power supply control switch K3, and a power indicator light D5.
[0053] The power input control switch K1 is connected to the AD-DC conversion unit T1. The power input control switch K1 is used to connect to the power supply (preferably AC mains power) to control the connection and disconnection between the power supply and the AD-DC conversion unit T1. The power input control switch K1 can be a circuit breaker.
[0054] The module power supply control switch K3 is connected between the power output control switch and the processing module 3. The module power supply control switch K3 can be an existing normally open switch.
[0055] The power indicator D5 is connected to the connection node of the power output control switch and the module power supply control switch. The power indicator D5 is used to indicate whether the DC power supply is output normally.
[0056] In this embodiment, the operator can close the power input control switch K1 to activate the AD-DC conversion unit T1, and then close the power output control switch K2. When the output voltage of the DC power supply from the AD-DC conversion unit T1 is normal (i.e., there is no overvoltage or undervoltage), the power indicator D5 will light up normally. If there is undervoltage, the power indicator D5 will not light up or the light intensity will be very weak. If there is overvoltage, the power indicator D5 will burn out due to overvoltage. Only after confirming that the output voltage of the DC power supply is normal can the operator close the module power supply control switch K3. This can handle the undervoltage or overvoltage situation of module 3 and ensure that the verification work can be carried out normally.
[0057] Since the logic for judging leakage anomalies is somewhat similar to the logic for judging phase loss, both involve determining whether the current in one phase is significantly lower than the current in other phases. To simplify the algorithm of processing module 3, in some embodiments, such as... Figure 1 As shown, the nuclear power submersible pump protector verification circuit may also include a simulated leakage module 6, which is connected to the processing module 3. The simulated leakage module 6 is used to output simulated leakage signals.
[0058] In this embodiment, the processing module 3 can use the same existing judgment algorithm to determine whether the leakage anomaly or the phase loss anomaly is normal. The operator can use the simulated leakage module 6 to inform the processing module 3 whether the normal verification is a leakage anomaly or a phase loss anomaly. For example, when the simulated leakage module 6 is operated, it means that the leakage detection and leakage alarm function of the nuclear power submersible pump under test is being verified. At this time, the processing module 3 will not control the phase loss indicator D1, but will only control the leakage indicator D4 to light up or turn off according to the obtained three-phase current. When the simulated leakage module 6 is not operated, the processing module 3 will not control the leakage indicator D4, but will only control the phase loss indicator D1 to light up or turn off according to the obtained three-phase current.
[0059] In some embodiments, such as Figure 2 As shown, the nuclear power submersible pump protector verification circuit may also include a reset module 7. The reset module 7 is connected to the processing module 3 and is used to output a reset signal that can reset the indication control command output by the processing module 3 (that is, the phase loss indicator D1, overload indicator D2, fault indicator D3 and leakage indicator D4 are all turned off), in preparation for verifying the next abnormal operating condition.
[0060] Furthermore, such as Figure 2 As shown, the reset module 7 and the simulated leakage module 6 can each include existing normally closed switches.
[0061] The technical solution of this utility model provides a three-phase power supply module to the nuclear power submersible pump under test, enabling the pump to experience abnormal operating conditions. A sampling module measures the three-phase current output from the power supply module. A processing module then outputs an indication control command based on the three-phase current to an indication module, which in turn outputs a corresponding indication signal based on the type of abnormal operating condition. This allows operators to verify the functionality of the protection device by comparing the indicated signal with the warning signal output by the nuclear power submersible pump protector. Furthermore, this utility model has advantages such as simple circuit structure and convenient operation.
[0062] This utility model also provides a nuclear power plant submersible pump protector calibration device, including the nuclear power plant submersible pump protector calibration circuit provided in the embodiments of this utility model.
[0063] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.
Claims
1. A nuclear power submersible pump protector calibration circuit, characterized by, include: A three-phase power supply module (1) is used to connect to the nuclear power submersible pump under test so as to cause the nuclear power submersible pump under test to have abnormal operating conditions by controlling the output current of each phase; wherein, the abnormal operating conditions include phase loss, overload, fault and leakage; A sampling module (2) for measuring the three-phase current output by the three-phase power supply module (1). A processing module (3) connected to the sampling module (2) for receiving the three-phase current and outputting indication and control commands; An indicator module (4) connected to the processing module (3) for receiving the indicator control command and outputting an indicator signal capable of displaying the type of abnormal operating condition; and A power supply module (5) connected to the processing module (3) and used to supply power to the processing module (3).
2. The nuclear power submersible pump protector verification circuit of claim 1, wherein, It also includes a simulated leakage module (6) connected to the processing module (3) for outputting simulated leakage signals.
3. The nuclear power submersible pump protector verification circuit of claim 2, wherein, It also includes a reset module (7) connected to the processing module (3) for outputting a reset signal.
4. The nuclear power submersible pump protector calibration circuit of claim 3, wherein, The reset module (7) and the simulated leakage module (6) each include a normally closed switch.
5. The nuclear power submersible pump protector calibration circuit of claim 2, wherein, The indicator module (4) includes: A phase loss indicator light is connected to the processing module (3); The overload indicator light is connected to the processing module (3); A fault indicator light connected to the processing module (3); and A leakage indicator light connected to the processing module (3).
6. The nuclear power submersible pump protector calibration circuit of claim 2, wherein, The sampling module (2) includes a three-phase current transformer for coupling with the three-phase power supply module (1) to measure the three-phase current.
7. The nuclear power submersible pump protector verification circuit according to any one of claims 2 to 6, wherein, The power supply module (5) includes: An AD-DC conversion unit used to connect to a power supply and output DC power; A current-limiting protector connected to the AD-DC conversion unit; and A power output control switch is connected between the positive output terminal of the current limiting protector and the power supply terminal of the processing module (3).
8. The nuclear power submersible pump protector verification circuit of claim 7, wherein, The power supply module (5) also includes: A power input control switch connected to the AD-DC conversion unit and used to connect the power supply to control the on / off connection between the power supply and the AD-DC conversion unit; A module power supply control switch connected between the power output control switch and the processing module (3); A power indicator light is connected to the connection node of the power output control switch and the module power supply control switch to indicate whether the DC power supply is outputting normally.
9. The nuclear power submersible pump protector verification circuit of claim 8, wherein, The power input control switch is a circuit breaker, and the power output control switch and the module power supply control switch are normally open switches.
10. A nuclear power submersible pump protector calibrating device, characterized in that, Includes the nuclear power plant submersible pump protector verification circuit as described in any one of claims 1 to 9.