Anti-maloperation device and method for power utilization protection of nuclear power plant
By setting up protection channels and startup channels in the central processor of the power protection device for nuclear power plants and performing multiple verifications, the problem that the device cannot operate accurately during its own failure or external interference is solved, and the device's anti-malfunction ability and safety are improved.
Patent Information
- Application Number
- CN202411443945.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-05-30
AI Technical Summary
The existing power protection devices for nuclear power plants cannot operate accurately when there is a failure or external interference, resulting in erroneous movement or refusal, affecting the safe and stable operation of nuclear power plants.
A device for power protection and malfunctioning for nuclear power plants is designed. By setting up a protection channel and a start channel in the central processor, and setting up a dual-channel phase instantaneous value verification, dual-channel instantaneous value verification and dual-channel amplitude verification between the two, the accuracy and consistency of data is ensured and malfunctioning is avoided.
Through the redundant hardware configuration and the diversity of software algorithms, the device's in-depth defense capabilities are effectively improved, and the calculation errors and protection error trips are prevented due to interference or chip abnormalities.
Smart Images
Figure CN120073623A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of relay protection in power systems, and particularly to a misoperation prevention device and method for the power consumption protection of nuclear power plants. Background Art
[0002] The power consumption system of a nuclear power plant is an important part of the nuclear power plant. The power consumption protection device of the nuclear power plant is an important part of the relay protection system of the nuclear power plant. The power consumption protection device of the nuclear power plant is mainly used for the protection of power consumption equipment such as lines, motors, busbars, and transformers in the nuclear power plant. When the above equipment fails, the power consumption protection device of the nuclear power plant can quickly act, isolate the fault, and protect the safety of the equipment. The reliability of the power consumption protection device of the nuclear power plant directly affects the reliability of the power consumption system of the nuclear power plant, and further affects the safe and stable operation of the entire nuclear power plant.
[0003] In the prior art, the power consumption protection device of a nuclear power plant generally uses a CPU chip with a dual-core architecture. The general practice is to use one core to run the management program, which is responsible for the processing of the human-machine interface, communication, etc., and the other core runs the operation protection program, which is responsible for protection logic judgment, trip output, etc. Therefore, most of the power consumption protection devices of nuclear power plants are in the situation of using a single processor or a single-core CPU for protection logic judgment and processing. If there are operation errors, faults of the power consumption protection device itself such as input quantity faults and analog quantity faults, or misoperations of the device setting values by on-site operators, misoperation or refusal to act will occur, which will pose a hidden danger to the safe and stable operation of the nuclear power plant. Summary of the Invention
[0004] The present invention provides a misoperation prevention device and method for the power consumption protection of a nuclear power plant, which is used to solve the problem that the operation protection program of the power consumption protection device of a nuclear power plant in the prior art cannot act accurately when affected by its own faults or external factors.
[0005] The technical solution of the present invention is as follows:
[0006] The present invention proposes a misoperation prevention device for the power consumption protection of a nuclear power plant. The device includes an instrument transformer, a central processing unit, a relay positive power supply open outlet, a protection action outlet, and an outlet relay. The instrument transformer collects and transmits analog quantity signals to the central processing unit; the central processing unit internally has a protection channel and a startup channel. Both the protection channel and the startup channel are sequentially provided with an analog-to-digital conversion chip, a sampling algorithm module, and a startup algorithm module. The analog-to-digital conversion chip receives the signals of the instrument transformer. The startup algorithm module is used to control the opening and closing of the relay positive power supply open outlet and the protection action outlet. A dual-channel phase instantaneous value verification is provided between the analog-to-digital conversion chip and the sampling algorithm module of the protection channel and the startup channel. The dual-channel phase instantaneous value verification module is used to verify the phase of the digital quantities of the two channels; the outlet relay is connected in series with the relay positive power supply open outlet and the protection action outlet.
[0007] In some embodiments, the starting channel, from the end receiving the mutual inductor signal to the end connecting to the positive power supply opening of the control relay, is successively provided with a sampling delay module A, an analog-to-digital conversion chip A, a sampling algorithm module A, and a starting algorithm module A. The starting algorithm module A controls the opening and closing of the positive power supply opening of the relay.
[0008] In some embodiments, the protection channel, from the end receiving the mutual inductor signal to the end connecting to the protection action outlet, is successively provided with an analog-to-digital conversion chip B, a sampling delay module B, a sampling algorithm module B, and a starting algorithm module B. The starting algorithm B controls the opening and closing of the protection action outlet.
[0009] In some embodiments, the analog-to-digital conversion chip A and the analog-to-digital conversion chip B are placed with a 90-degree mirror image and the distance exceeds 10 cm; the sampling delay modules A and B have the same delay period.
[0010] In some embodiments, the instantaneous values between the analog-to-digital conversion chip A and the sampling algorithm module A of the starting channel and between the analog-to-digital conversion chip B and the sampling delay module B of the protection channel are measured in the dual-channel phase instantaneous value verification. The digital quantities of the instantaneous values are subjected to phase verification using the Clark transformation, and the calculated phase difference should be within ±1 degree to pass the verification.
[0011] In some embodiments, the device is also provided with a dual-channel instantaneous value verification. The dual-channel instantaneous value verification measures the instantaneous values between the analog-to-digital conversion chip A and the sampling algorithm module A of the starting channel and between the sampling delay module B and the sampling algorithm module B of the protection channel. The dual-channel instantaneous value verifies the two instantaneous values, and the instantaneous value of the protection channel is delayed by 1 / 4 cycle and orthogonally vector-verified with the instantaneous value of the starting channel.
[0012] In some embodiments, the device is also provided with a dual-channel amplitude verification. The dual-channel amplitude verification measures the digital quantities between the sampling algorithm module A and the starting algorithm A of the starting channel and between the sampling algorithm module B and the starting algorithm B of the protection channel. The amplitudes of the two channels are calculated respectively using the half-wave integration and Fourier series methods, and the amplitudes are mutually verified.
[0013] In some embodiments, the mutual inductor includes a voltage mutual inductor and a current mutual inductor, and the device processes the current signal and the voltage signal.
[0014] The present invention proposes a method for preventing misoperation of the electrical protection in a nuclear power plant, and the method includes:
[0015] Step 1: The mutual inductor collects the current and voltage signals and converts them into analog signals, and the starting channel and the protection channel of the central processor sample the analog signals of the mutual inductor.
[0016] Step 2: The startup channel and the protection channel convert analog signals into digital signals, and sequentially perform instantaneous value verification, phase verification, and amplitude verification to identify abnormal digital signals.
[0017] Step 3: The startup channel and the protection channel perform separate verification judgments. If the digital signal is normal and the startup algorithm module meets the protection tripping logic, the positive power supply of the control relay of the startup channel is opened and the outlet is closed, the protection action outlet of the protection channel is closed, and the outlet relay performs a tripping action.
[0018] In some embodiments, in Step 2, the startup channel and the protection channel convert analog signals into digital signals, and sequentially perform phase verification, instantaneous value verification, and amplitude verification to identify abnormal digital signals. Specifically, it includes:
[0019] Step 2.1: The startup channel forms a phase difference with the analog signal sampled by the protection channel through the sampling delay module A, and the startup channel and the protection channel convert the analog signal into a digital signal through the analog-to-digital conversion chip.
[0020] Step 2.2: The dual-channel phase instantaneous value verification performs phase verification on the digital signals of the startup channel and the protection channel.
[0021] Step 2.3: The digital signal of the protection channel passes through the sampling delay module B and has the same phase as the digital signal of the startup channel. The dual-channel instantaneous value verification performs instantaneous value verification on the digital signals of the startup channel and the protection channel.
[0022] Step 2.4: The dual-channel amplitude verification performs amplitude verification on the digital signals of the startup channel and the protection channel.
[0023] Implementing the present invention has the following beneficial effects
[0024] The present invention proposes a nuclear power plant electrical protection anti-misoperation device and its method. The present invention sets up a protection channel and a startup channel, performs instantaneous value verification, phase verification, and amplitude verification on data, and through redundant hardware configuration and diversity of software algorithms, can effectively improve the device's in-depth defense ability. The protection channel and the startup channel of the device can actually trip the outlet only after mutual verification, preventing the situation of protection mis-tripping caused by calculation errors due to interference, chip abnormalities, etc. when the current nuclear power plant electrical protection device uses a single processor or a single CPU core to run the protection program. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a schematic diagram of a nuclear power plant electrical protection anti-misoperation device proposed by an embodiment of the present invention;
[0026] Description of the Drawings: 1. Voltage transformer; 2. Current transformer; 3. Sampling delay module A; 4. Analog-to-digital conversion chip A; 5. Analog-to-digital conversion chip B; 6. Dual-channel instantaneous value verification; 7. Sampling delay module B; 8. Sampling algorithm module A; 9. Sampling algorithm module B; 10. Dual-channel amplitude verification; 11. Starting algorithm module A; 12. Starting algorithm module B; 13. Dual-channel phase instantaneous value verification; 14. Relay positive power supply open outlet; 15. Protection action outlet; 16. Outlet relay; 17. Central processing unit. Detailed implementation manners
[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the drawings and specific implementation manners. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0028] As Figure 1 shown, the present invention provides a misoperation prevention device for the power consumption protection of a nuclear power plant. The device includes a transformer, a central processing unit 17, a relay positive power supply open outlet 14, a protection action outlet 15, and an outlet relay 16. The transformer collects analog signals and transmits the analog signals to the central processing unit 17. The transformer includes a voltage transformer 1 and a current transformer 2. The central processing unit 17 controls the opening and closing of the relay positive power supply open outlet 14 and the protection action outlet 15 by processing the analog signals. The outlet relay 16 is connected in series with the relay positive power supply open outlet 14 and the protection action outlet 15. When both the relay positive power supply open outlet 14 and the protection action outlet 15 are closed, the outlet relay 16 makes a tripping action to isolate the fault. The central processing unit 17 internally has a protection channel and a starting channel. Both the protection channel and the starting channel are sequentially provided with an analog-to-digital conversion chip, a sampling algorithm module, and a starting algorithm module. The analog-to-digital conversion chip receives the signals from the transformer. The sampling algorithm module performs periodic sampling on the analog signals and converts them into digital signals through the analog-to-digital conversion chip. The starting algorithm module is used to control the opening and closing of the relay positive power supply open outlet 14 and the protection action outlet 15.
[0029] The starting channel, from the end receiving the signals from the transformer to the end connected to control the relay positive power supply open outlet 14, is sequentially provided with a sampling delay module A3, an analog-to-digital conversion chip A4, a sampling algorithm module A8, and a starting algorithm module A11. The starting algorithm module A11 controls the opening and closing of the relay positive power supply open outlet 14. The protection channel, from the end receiving the signals from the transformer to the end connected to the protection action outlet 15, is sequentially provided with an analog-to-digital conversion chip B5, a sampling delay module B7, a sampling algorithm module B9, and a starting algorithm module B12. The starting algorithm B controls the opening and closing of the protection action outlet 15.
[0030] The above-mentioned analog-to-digital conversion chip A4 and analog-to-digital conversion chip B5 are placed with a 90-degree mirror image and the distance exceeds 10 cm to prevent common-cause failures in space. A delay module A is set before the operation of the analog-to-digital conversion chip A4, and a delay module B is set after the operation of the analog-to-digital conversion chip B5. The sampling delay modules A3 and B7 have the same delay period, preventing common-cause failures in time.
[0031] The device is also provided with a dual-channel phase instantaneous value verification 13. The dual-channel phase instantaneous value verification 13 measures the instantaneous value between the analog-to-digital conversion chip A4 of the starting channel and the sampling algorithm module A8, and the instantaneous value between the analog-to-digital conversion chip B5 of the protection channel and the sampling delay module B7. The phase verification of the digital quantity of the instantaneous value is carried out by using the Clark transformation, and the calculated phase difference should be within ±1 degree.
[0032] The device is also provided with a dual-channel instantaneous value verification 6. The dual-channel instantaneous value verification 6 measures the instantaneous value between the analog-to-digital conversion chip A4 of the starting channel and the sampling algorithm module A8, and the instantaneous value between the sampling delay module B7 of the protection channel and the sampling algorithm module B9. These two instantaneous values are verified, and the delay of 1 / 4 cycle of the protection channel is orthogonally vector-verified with the instantaneous value of the starting channel.
[0033] The device is also provided with a dual-channel amplitude verification 10. The dual-channel amplitude verification 10 measures the instantaneous value between the sampling algorithm module A8 of the starting channel and the starting algorithm A, and the digital quantity amplitude between the sampling algorithm module B9 of the protection channel and the starting algorithm B. The amplitudes of the digital quantities of the two channels are calculated by using the half-wave integration and Fourier series methods respectively and verified with each other.
[0034] The present invention proposes a method for preventing misoperation of electrical protection in nuclear power plants. The method includes:
[0035] Step 1: The current and voltage signals are collected by the mutual inductor and converted into analog signals. The starting channel and the protection channel of the central processor 17 sample the analog signals of the mutual inductor.
[0036] Step 2: The starting channel and the protection channel convert the analog signals into digital signals, and sequentially pass through the instantaneous value verification, phase verification, and amplitude verification to identify abnormal digital signals.
[0037] Step 2.1: The starting channel forms a phase difference with the analog signal sampled by the protection channel through the sampling delay module A3. The starting channel and the protection channel convert the analog signal into a digital signal through the analog-to-digital conversion chip;
[0038] Step 2.2: The dual-channel phase instantaneous value verification 13 performs phase verification on the digital signals of the starting channel and the protection channel;
[0039] Step 2.3: The digital signal of the protection channel passes through the sampling delay module B7 and has the same phase as the digital signal of the starting channel. The dual-channel instantaneous value verification 6 performs instantaneous value verification on the digital signals of the starting channel and the protection channel;
[0040] Step 2.4: The dual-channel amplitude verification 10 performs amplitude verification on the digital signals of the starting channel and the protection channel.
[0041] Step 3: The starting channel and the protection channel are separately verified and judged. If the digital signal is normal and the starting algorithm module meets the protection tripping logic, the positive power supply of the control relay of the starting channel is opened, the outlet 14 is closed, the protection action outlet 15 of the protection channel is closed, and the outlet relay 16 performs a tripping action.
[0042] The present invention proposes an anti-misoperation device for the power consumption protection of nuclear power plants. The specific implementation manner of the device is as follows:
[0043] Embodiment 1: Overcurrent protection:
[0044] The current transformer 2 collects current data. The protection channel collects the current analog quantity data in the channel for calculation to obtain the current amplitude of the protection channel. If the obtained current quantity is verified without error through instantaneous value verification, phase verification, amplitude verification, etc. with the current quantity in the starting channel and meets the protection tripping logic, it is determined that a fault has occurred, and a tripping decision is made, and the protection action outlet 15 is closed; while the starting channel collects the current analog quantity data in the channel for calculation to obtain the current amplitude of the starting channel. If the obtained current quantity is verified without error through instantaneous value verification, phase verification, amplitude verification, etc. with the current quantity in the protection channel and meets the protection tripping logic, a decision to start an overcurrent fault is made, and the positive power supply of the control relay of the starting channel is opened and the outlet 14 is closed; when the protection channel makes an overcurrent protection tripping decision and the starting channel makes a decision to start an overcurrent fault at the same time, the outlet relay 16 performs a trip to isolate the fault.
[0045] Embodiment 2: Overvoltage protection:
[0046] The voltage transformer 1 collects voltage data. The protection channel calculates the voltage analog quantity data in the channel to obtain the voltage amplitude of the protection channel. If the obtained voltage quantity is verified without error through instantaneous value verification, phase verification, amplitude verification, etc. with the voltage quantity in the startup channel and meets the protection tripping logic, it is determined that a fault has occurred, and a tripping decision is made, and the protection action outlet 15 closes; while the startup channel calculates the voltage analog quantity data in the channel to obtain the voltage amplitude of the startup channel. If the obtained voltage quantity is verified without error through instantaneous value verification, phase verification, amplitude verification, etc. with the voltage quantity in the protection channel and meets the protection tripping logic, a decision of overvoltage fault startup is made, and then the positive power supply of the startup channel control relay opens and the outlet 14 closes; when the protection channel makes an overvoltage protection tripping decision and the startup channel makes an overvoltage fault startup decision at the same time, the outlet relay 16 trips to isolate the fault.
[0047] After adopting the above method, it can prevent the situation of protection mis-tripping caused by calculation errors due to interference, chip abnormalities, etc. when the current nuclear power plant electrical protection device generally uses a single processor or a single CPU core to run the protection program.
[0048] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.
Claims
1. A nuclear power plant power protection anti-malfunction device, characterized in that: The device comprises a mutual inductor, a central processing unit (17), a relay positive power supply opening outlet (14), a protection action outlet (15) and an outlet relay (16); the mutual inductor collects and transmits analog signals to the central processing unit (17); a protection channel and a start channel are arranged inside the central processing unit (17); the protection channel and the start channel are respectively provided with an analog-to-digital conversion chip, a sampling algorithm module and a start algorithm module; the analog-to-digital conversion chip receives the signal of the mutual inductor; the start algorithm module is used to control the opening and closing of the relay positive power supply opening outlet (14) and the protection action outlet (15); a dual-channel phase instantaneous value check (13) is arranged between the analog-to-digital conversion chip and the sampling algorithm module of the protection channel and the start channel; the dual-channel phase instantaneous value check (13) module is used to check the phases of two channel digital quantities; the outlet relay (16) is connected in series with the relay positive power supply opening outlet (14) and the protection action outlet (15).
2. A nuclear power plant power protection anti-malfunction device according to claim 1, characterized in that: The start-up channel is provided with a sampling delay module A (3), an analog-to-digital conversion chip A (4), a sampling algorithm module A (8) and a start-up algorithm module A (11) in sequence from an end receiving the mutual inductor signal to an end connected to the control relay positive power supply opening outlet (14). The start-up algorithm module A (11) controls the opening and closing of the relay positive power supply opening outlet (14).
3. A nuclear power plant power protection anti-malfunction device according to claim 2, characterized in that: The protection channel is provided with an analog-to-digital conversion chip B (5), a sampling delay module B (7), a sampling algorithm module B (9) and a start algorithm module B (12) in sequence from an end receiving the mutual inductor signal to an end connected to the protection action outlet (15), and the start algorithm B controls the opening and closing of the protection action outlet (15).
4. A nuclear power plant power protection anti-malfunction device according to claim 3, characterized in that: The analog-to-digital conversion chip A (4) and the analog-to-digital conversion chip B (5) are placed in a mirror image at 90 degrees and the distance between them is more than 10 centimeters; the sampling delay module A (3) and the sampling delay module B (7) have the same delay period.
5. The nuclear power plant power protection anti-malfunction device according to claim 3, characterized in that: The dual-channel phase instantaneous value check (13) measures the instantaneous value between the analog-to-digital conversion chip A (4) and the sampling algorithm module A (8) of the start channel and the instantaneous value between the analog-to-digital conversion chip B (5) and the sampling delay module B (7) of the protection channel, and uses Clark transformation to perform phase check on the digital quantity of the instantaneous value. The calculated phase difference should be within ±1 degree to pass the check.
6. A nuclear power plant power protection anti-malfunction device according to claim 3, characterized in that: The device is also provided with a dual-channel instantaneous value check (6), which measures the instantaneous value between the analog-to-digital conversion chip A (4) and the sampling algorithm module A (8) of the start channel and the instantaneous value between the sampling delay module B and the sampling algorithm module B (9) of the protection channel. The dual-channel instantaneous value checks the two instantaneous values and performs an orthogonal vector check on the instantaneous value of the protection channel delayed by 1 / 4 cycle and the instantaneous value of the start channel.
7. A nuclear power plant power protection anti-malfunction device according to claim 6, characterized in that: The device is also provided with a dual-channel amplitude check (10), wherein the dual-channel amplitude check (10) measures the digital quantity between the sampling algorithm module A (8) and the starting algorithm module A (11) of the starting channel and the digital quantity between the sampling algorithm module B (9) and the starting algorithm module B (12) of the protection channel, calculates the amplitude of the digital quantity of the two channels by using the half-wave integral method and the Fourier series method respectively, and checks the amplitudes against each other.
8. The nuclear power plant power protection anti-malfunction device according to claim 1, characterized in that: The transformer comprises a voltage transformer (1) and a current transformer (2), and the device processes current signals and voltage signals.
9. A method for preventing misoperation of power protection in a nuclear power plant according to any one of claims 1 to 8, characterized in that: The method comprises: Step 1: The transformer collects current and voltage signals and converts them into analog signals, and the start channel and protection channel of the central processor (17) sample the analog signals of the transformer; Step 2: The start channel and the protection channel convert the analog signal into a digital signal, and identify digital signal abnormalities through instantaneous value verification, phase verification, and amplitude verification in sequence; Step 3: The start channel and the protection channel are checked and judged separately. If there is no abnormality in the digital signal and the start algorithm module satisfies the protection tripping logic, the start channel controls the positive power supply opening outlet (14) of the relay to be closed, and the protection channel controls the protection action outlet (15) to be closed, and the outlet relay (16) performs a tripping action.
10. A method for preventing misoperation of power protection in a nuclear power plant according to claim 9, characterized in that: In the step 2, the start channel and the protection channel convert the analog signal into a digital signal, and identify the digital signal abnormality through phase verification, instantaneous value verification, and amplitude verification in sequence, specifically including: Step 2.1: The start channel forms a phase difference with the analog signal sampled by the protection channel through the sampling delay module A (3), and the start channel and the protection channel convert the analog signal into a digital signal through the analog-to-digital conversion chip; Step 2.2: Dual-channel phase instantaneous value verification (13) Perform phase verification on the digital signals of the start channel and the protection channel; Step 2.3: The digital signal of the protection channel passes through the sampling delay module B (7) and has the same phase as the digital signal of the start channel. The dual-channel instantaneous value check (6) performs instantaneous value check on the digital signals of the start channel and the protection channel. Step 2.4: Dual-channel amplitude verification (10) Amplitude verification is performed on the digital signals of the start channel and the protection channel.