CN112509718B - Gray code processing clamp threshold setting device and method for rod position system of nuclear power station - Google Patents
Gray code processing clamp threshold setting device and method for rod position system of nuclear power station Download PDFInfo
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- CN112509718B CN112509718B CN202011378782.4A CN202011378782A CN112509718B CN 112509718 B CN112509718 B CN 112509718B CN 202011378782 A CN202011378782 A CN 202011378782A CN 112509718 B CN112509718 B CN 112509718B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
- G01B21/042—Calibration or calibration artifacts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E30/30—Nuclear fission reactors
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Abstract
The invention provides a nuclear power station rod position system Gray code processing clamp threshold setting device which comprises a signal acquisition interface module, a signal acquisition module, a signal preprocessing module and an engineer station. The signal acquisition interface module leads out the ABCDE coil voltage waveform of the rod position detector and sends the voltage waveform to the signal acquisition module and the signal preprocessing module. The signal preprocessing module converts the ABCDE coil voltage waveform signals acquired by all the signal acquisition modules into CSV format files and transmits the CSV format files to the engineer station through a network port based on a TCP protocol. The engineer station is used to process, calculate the ABCDE code coil voltage waveform signal and display the final calculated threshold. The invention also provides a method for setting the Gray code processing clamp threshold of the rod position system of the nuclear power station. The invention can effectively improve the efficiency and accuracy of setting the threshold of the Gray code processing clamp of the existing rod position system.
Description
Technical Field
The invention belongs to the technical field of instrument control, and particularly relates to a device and a method for setting a Gray code processing clamp threshold of a rod position system of a nuclear power station.
Background
Because the control rod bundle of the reactor is positioned in a loop high-temperature and high-pressure environment, the position of the control rod bundle cannot be directly measured, and at present, a domestic pressurized water reactor nuclear power plant generally adopts the electromagnetic induction principle to measure the position of the control rod, a rod position detector is developed according to the principle, and the control rod position detector structurally comprises three coils of a primary coil, a secondary coil and an auxiliary coil (also called a compensation coil), a coil framework, an inner cylinder, an outer cylinder and the like, wherein the coil framework and the inner cylinder are made of low-magnetic-permeability materials. Taking 61 rod position detectors of Fuqing nuclear power 5 and 6 units as an example, winding secondary coils and compensation coils on a coil framework firstly, wherein the winding directions of the 33 coils are consistent, each coil is wound by polyimide enameled wires with the wire diameter of 0.224mm, the number of turns of the coils is 1700+/-10, the number of the secondary coils is 31, and the number of the compensation coils is 2. Then, a layer of primary coil is closely wound on the coil skeleton, 33 coils are covered on the primary coil, and the coils are wound by SBF260 high-temperature resistant winding wires with the diameter of 1.97 mm. The primary coil and 33 coils are insulated by polyimide glass varnished cloth half-laminated layers.
When the rod position detector is in operation, the primary coil is excited by alternating current of 50Hz, an alternating magnetic field is generated in the detector, the magnetic field enables induced voltage to be generated in the secondary coil, and when the exciting current is constant, if a magnetic driving rod passes through the secondary coil, the induced voltage of the secondary coil is obviously changed: when the top of the driving rod is positioned below the secondary coil, the induced voltage is small; when the top of the driving rod is positioned above the secondary coil, the induction voltage is large, and thus, the position of the top of the driving rod can be known by monitoring the induction voltage of the secondary coil at a certain position.
It is known that the magnetic drive rods have a mechanical step size of 15.875mm each and the rod position detector has a resolution of 8 mechanical steps, 127mm, i.e. 31 secondary coils equally spaced 127 mm. The secondary 31 coils are divided into A, B, C, D, E five Gray codes, and the coded coil numbers from top to bottom are as follows:
group a consists of 16 coils: # 1, # 3, # 5# … … #, # 31#;
group B consists of 8 coils: 2#, 6#, 10#, 14#, 18#, 22#, 26#, 30#;
group C consists of 4 coils: # 4, # 12, # 20, # 28;
group D consists of 2 coils: 8# and 24#;
group E consists of 1 coil: 16# (middle coil).
FIG. 1 of the accompanying drawings shows the disclosed position distribution and connection relationship of the rod position detector coils.
The control rod position signal consists of five-bit Gray codes, and when the driving rod moves from one coil interval to the other coil interval, only one bit in the Gray codes changes, so that the probability of error occurrence is greatly reduced, and the coil operation abnormality of which group can be positioned relatively quickly.
The position measurement of a bundle of control rods (hung at the bottom of a driving rod) is mainly realized by a main current controller assembly (MCP 10) and a Gray code processing clamp (MCP 22), wherein the MCP10 mainly has the function of supplying 50Hz VAC excitation current to a primary coil of a detector, carrying out negative feedback adjustment according to the induction voltage of a compensation coil and providing a relatively stable alternating magnetic field for a secondary coil. The MCP22 is mainly used for performing a tuning process on the output signal of the secondary coil of the detector to form a regular gray code rectangular pulse signal for rod position display.
The Gray code processing clamp performs absolute value and filtering processing on alternating voltage waveforms of the secondary A, B, C, D, E code coil, shapes and outputs alternating voltage signals into positive voltage signals, compares the positive voltage signals with threshold voltage output by the adjustable LDO power chip, and outputs corresponding Gray codes.
Rod position measurement channel performance identification is an important task at reactor start-up during commissioning and each overhaul. Based on the fact that the existing Gray code processing clamp does not have the functions of digitalization and intellectualization, the adjustment accuracy is very low by manually adjusting the Gray code threshold voltage only through the working experience of debugging/maintenance staff, repeated adjustment is needed, lifting/inserting the rod for many times is needed to verify until the linearity of the rod position measuring system meets the requirement, the rod speed is 20 steps/min, 17 full-stroke rod moving operations are needed on average for a single rod group to finish the threshold value setting work, at least more than 8 days are needed to finish the rod position threshold value setting work according to the debugging result of a preamble unit, and the whole process is long in time.
Therefore, there is a need to develop a method and apparatus for setting the graham clamp threshold of a rod and bit system of a nuclear power plant that can solve the above-mentioned problems.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device and a method for setting the threshold of a Gray code processing clamp of a rod position system of a nuclear power station, and the method improves the accuracy of setting the threshold of the Gray code processing clamp.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the Gray code processing clamp threshold setting device of the rod position system of the nuclear power station is arranged between the rod position detector and the rod position machine box; the system comprises a signal acquisition interface module, a signal acquisition module, a signal preprocessing module and an engineer station.
The signal acquisition interface module is connected between the rod position detector and the rod position machine case in series, and the signal acquisition module is connected with the signal acquisition interface module. The signal acquisition interface module leads out the ABCDE coil voltage waveform of the rod position detector and sends the voltage waveform to the signal acquisition module and the signal preprocessing module. The signal preprocessing module is connected with the engineer station.
The wiring led out by one signal acquisition interface module is provided with 6 cores, and 5 coils and a public end of the ABCDE code of one rod position detector are respectively corresponding to the wiring.
The single signal acquisition module has four channels, and a rod position detector signal needs to occupy five channels, and simultaneously acquires a total of 45 channels of 9 rod position detector signals, and 12 signal acquisition modules are needed.
The signal preprocessing module is provided with a network port. The signal preprocessing module is connected with the engineer station through a network port. The signal preprocessing module converts the ABCDE coil voltage waveform signals acquired by all the signal acquisition modules into CSV format files and transmits the CSV format files to the engineer station through a network port based on a TCP protocol.
The engineer station comprises a data receiving module, a hardware simulation module, a data processing module and a display output module. The engineer station is used to process, calculate the ABCDE code coil voltage waveform signal and display the final calculated threshold.
The data receiving module receives the data from the signal preprocessing module, and after adding the corresponding time sequence time_index to the data, the data are respectively sent to the data processing module and the hardware simulation module. After the processing, the display module outputs and displays the final bar position threshold setting result.
The hardware simulation module is used for simulating the hardware circuit function of the Gray code card, and output signals of the hardware simulation module are transmitted to the data processing module.
The data processing module analyzes the data from the signal preprocessing module to obtain a given rod position counter M Given rod position . The data processing module compares the threshold value of the output signal of the hardware simulation module, outputs the lifting full-stroke measuring rod position after comparison, compares the lifting full-stroke measuring rod position with a given rod position counter, and sets the current Gray code ABCDE threshold value.
The display output module displays the Gray code setting result and the ABCDE coil voltage waveform.
The model of the signal and processing module is crio-9048.
The model of the signal acquisition module is NI9229.
The invention also provides a nuclear power station rod position system Gray code processing clamp threshold value setting method using the nuclear power station rod position system Gray code processing clamp threshold value setting device, which comprises the following steps:
(1) Connecting the signal acquisition interface module to a rod position measuring cabinet of a threshold to be set;
(2) The signal acquisition module acquires and records the voltage waveform of the secondary coil of the corresponding bar bundle of the bar position detector, sends the voltage waveform to the signal preprocessing module to be converted into a CSV format file, and sends the CSV format file to the data receiving module of the engineer station through a network port on the preprocessing module based on a TCP protocol;
(3) The data receiving module receives the data from the preprocessing module in the step (2), and after adding corresponding time sequence time_index to the data, the data are respectively sent to the data processing module and the hardware simulation module; the data processing module analyzes the received voltage waveform, judges the action direction of the current control rod and creates a given rod position counter M Given rod position ：
S1: data acquisition and signal validity judgment: the effectiveness of the acquired signals of the secondary coil is judged, and the judgment standard is as follows: d (RMS (E)/t) < score (loss (d (RMS)/t), W), wherein W is 0.8, E is the effective value of the E code waveform;
s2: data model processing and timestamp calculation:
sampling the A-E code feedback voltage waveforms acquired by the single rod position detector to obtain A-E code feedback voltage waveforms with consistent time sequences; performing time sequence data analysis by adopting signal processing methods such as arithmetic average, norm, array analysis and the like; carrying out weighted average and norm processing on the A code waveform to obtain a control rod action starting time stamp;
s3: and (3) performing weighted processing on the current feedback signals of the rod position acquisition coil and controlling rod lifting direction judgment:
performing time sequence calculation on voltage waveforms fed back by the rod position detector to the A-E codes to obtain time sequence feedback T of a single coil on the action state of the control rod A ～T E . For T A ～T E Performing weighted calculation to obtain a weighted control rod moving rod time sequence value T: t=t A +0.7×T B +0.5×T C +0.1×T D The method comprises the steps of carrying out a first treatment on the surface of the When T is more than 0.789 seconds, the current moving rod direction is downward inserted, and the logic state is set to be 1; if T is less than or equal to 0.789 seconds, the current moving rod direction is lifting, and the logic state is set to be 0;
if the opposite judgment standards of two or more times appear continuously under the corresponding logic states, resetting the current logic state and the recorded number of moving bars;
s4: creating a moving rod subgroup counter M Given rod position ：
When the moving rod direction is determined, a given rod position moving rod counter is created, and a given rod position group is created on the basis of the original time sequence to obtain a given rod position M with the time sequence Given rod position ；
(4) The hardware simulation module is used for carrying out digital simulation on the absolute value of a hardware circuit of the Gray code card and the low-pass filter circuit, and carrying out digital processing on the voltage waveform of the secondary coil of the rod position detector:
s1: carrying out data model absolute value processing on secondary coil signals acquired by the A-E codes of the rod position detectors;
s2: carrying out low-pass filtering treatment on the treated signals to obtain simulation waveforms cir_result consistent with the hardware circuit of the Gray code card; the output array of the circuit simulation maintains the same time sequence as the original signal;
(5) The data processing module carries out threshold judgment on the signal digitally processed in the step (4) on the premise of obtaining the action direction of the control rod and the given rod position counter, and obtains the five-code threshold value and the threshold value interval of the Gray code processor ABCDE:
comparing the dynamic threshold values of cir_result of the A-E codes, simulating the rod bit threshold value debugging within the threshold value setting range, and screening the dynamic threshold value result:
based on the ABCDE code voltage threshold setting range, comparing the threshold voltage with the output signal of the step (4) from the lowest voltage value, wherein the voltage value of the signal is recorded as 1 when the voltage value is higher than the threshold voltage, and as 0 when the voltage value is lower than the threshold voltage;
the A-E codes after threshold comparison are used for obtaining M under the threshold according to the Gray code coding rule Measuring rod position The method comprises the steps of carrying out a first treatment on the surface of the Given dynamic bar counter M in combination with creation Given rod position And the obtained M Measuring rod position And comparing, and calculating the jump and the number of times of linear disqualification. The jump calculation standard is as follows: skip= |m Given rod position -M Measuring rod position The judgment basis of one jump is as follows: skip is more than or equal to 8 steps. The jump condition is recorded in the full travel range, and the number of unqualified times is accumulated.
And (5) performing linearity judgment while calculating the skip.
The linearity calculation formula is: liner=M Given rod position -M Measuring the rod position;
the qualified standard range of linearity is: [7, -4] [5, -6] [6, -5]; if the Liner value is not in the qualified standard range, recording the failure. And in the full-stroke bar moving process, recording all the unqualified times, and accumulating the unqualified times.
After the linearity of the threshold is judged, the voltage value with the accuracy of 1mV is increased, and analysis and judgment are carried out one by one according to the judgment principle and the standard.
Wherein, the set range of the voltage threshold of the A code is 2.5 to 4.3 and V, B codes, the set range of the voltage threshold of the A code is 2.5 to 4.5 and V, C codes, the set range of the voltage threshold of the A code is 4.1 to 5.5 and V, D codes, the set range of the voltage threshold of the A code is 4.5 to 6.5 and V, E codes, and the set range of the voltage threshold of the A code is 6.8 to 8.5V.
(6) And finishing the threshold setting process and outputting a visual threshold adjustment interval:
if the sum of the jump times and the linearity disqualification times is less than 5, outputting the threshold value; if the sum of the jump times and the linearity disqualification times is more than or equal to 5, sequentially listing the corresponding threshold values of the disqualification times from low to high.
(7) Sequentially measuring and adjusting a A, B, C, D, E-code potentiometer on a front panel of the Gray code processing clamp according to the threshold interval provided in the step (6), so that the output voltage value of the LDO power supply chip of each code is within the threshold interval;
(8) Further moving the stick to verify the self threshold accuracy of the Gray code card: the control rod is allowed to run a full stroke, further verifying the accuracy of the threshold.
The beneficial effects obtained by the invention are as follows:
1. according to the invention, only 2-3 full-stroke movable bars are needed, so that the efficiency and accuracy of setting the Gray code processing clamp threshold of the existing bar position system can be effectively improved, the linearity adjustment time of the bar position measurement channel is reduced, and the functional reliability of the system is improved.
2. Based on the digital intelligent analysis and calculation threshold result, maintenance work can be standardized, and safety risk is reduced.
Drawings
FIG. 1 is a schematic diagram of a nuclear power station rod position system Gray code processing clamp threshold setting device;
FIG. 2 is a flow chart of a method for setting the Gray code processing clamp threshold of the rod-in-bit system of the nuclear power plant.
In the figure: 01 is a rod position detector; 02 is a bar position machine box; 10 is a signal acquisition interface module; 20 is a signal acquisition module; 30 is a signal preprocessing module; 40 is an engineer station; 41 is a data receiving module; 42 is a hardware simulation module; 43 is a data processing module; 44 is a display output module; timing_amax & Timing_amin is the waveform voltage maximum and minimum.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
As shown in fig. 1-2, the invention provides a nuclear power station rod position system Gray code processing clamp threshold setting device which is arranged between a rod position detector 01 and a rod position machine case 02; including a signal acquisition interface module 10, a signal acquisition module 20, a signal preprocessing module 30, and an engineer station 40.
The signal acquisition interface module 10 is connected in series between the rod position detector 01 and the rod position machine case 02, and the signal acquisition module 20 is connected with the signal acquisition interface module 10. The signal acquisition interface module 10 sends the ABCDE coil voltage waveform of the rod position detector 01 to the signal acquisition module 20 and the signal preprocessing module 30. The signal preprocessing module 30 is connected to an engineer station 40.
The wiring led out by one signal acquisition interface module 10 is provided with 6 cores, and 5 coils and a public end of the ABCDE code of one rod position detector are respectively corresponding.
The single signal acquisition module 20 has four channels, and one rod position detector signal needs to occupy five channels, and meanwhile, a total of 45 channels are required for acquiring 9 rod position detector signals, and 12 signal acquisition modules 20 are required.
The signal preprocessing module 30 is provided with a network port. The signal preprocessing module 30 is connected to the engineer station 40 through a gateway. The signal preprocessing module 30 converts all ABCDE coil voltage waveform signals collected by the signal collection module 20 into CSV format files and transmits them to the engineer station 40 through a portal based on the TCP protocol.
The engineer station 40 includes a data receiving module 41, a hardware simulation module 42, a data processing module 43 and a display output module 44. The engineer station 40 is used to process, calculate the ABCDE code coil voltage waveform signal and display the final calculated threshold.
The data receiving module 41 receives the data from the signal preprocessing module 30, and after adding the corresponding time sequence time_index to the data, the data is sent to the data processing module 43 and the hardware simulation module 42 respectively. After processing, the display module 44 outputs and displays the final bar position threshold setting result.
The hardware simulation module 42 is used for simulating the hardware circuit function of the Gray code card, and the output signal of the hardware simulation module 42 is transmitted to the data processing module 43.
The data processing module 43 analyzes the data from the signal preprocessing module 30 to obtain a given bar position counter M Given rod position . The data processing module 43 performs threshold comparison on the output signal of the hardware simulation module 42, outputs the lifting full-stroke measurement rod position after the comparison, compares the lifting full-stroke measurement rod position with a given rod position counter, and adjusts the current Gray code ABCDE threshold.
The display output module 44 displays the Gray code tuning results and the ABCDE coil voltage waveforms.
The model of the signal and processing module 30 is crio-9048.
The model of the signal acquisition module 20 is NI9229.
The invention also provides a nuclear power station rod position system Gray code processing clamp threshold value setting method using the nuclear power station rod position system Gray code processing clamp threshold value setting device, which comprises the following steps:
(1) Connecting the signal acquisition interface module 10 to a rod position measuring cabinet of a threshold to be set;
(2) The signal acquisition module 20 acquires and records the voltage waveform of the secondary coil of the corresponding bar bundle of the bar position detector 01, sends the voltage waveform to the signal preprocessing module 30 to be converted into a CSV format file, and sends the CSV format file to the data receiving module 41 of the engineer station 40 through a network port on the preprocessing module 30 based on a TCP protocol;
(3) The data receiving module 41 receives the data from the preprocessing module 30 in the step (2), and after adding a corresponding time sequence time_index to the data, the data are respectively sent to the data processing module 43 and the hardware simulation module 42; the data processing module 43 analyzes the received voltage waveform, determines the current control rod motion direction and creates a given rod position counter M Given rod position ：
S1: data acquisition and signal validity judgment: the effectiveness of the acquired signals of the secondary coil is judged, and the judgment standard is as follows: d (RMS (E)/t) < score (loss (d (RMS)/t), W), wherein W is 0.8, E is the effective value of the E code waveform;
s2: data model processing and timestamp calculation:
sampling the A-E code feedback voltage waveforms acquired by the single rod position detector to obtain A-E code feedback voltage waveforms with consistent time sequences; performing time sequence data analysis by adopting signal processing methods such as arithmetic average, norm, array analysis and the like; carrying out weighted average and norm processing on the A code waveform to obtain a control rod action starting time stamp;
s3: and (3) performing weighted processing on the current feedback signals of the rod position acquisition coil and controlling rod lifting direction judgment:
performing time sequence calculation on voltage waveforms fed back by the rod position detector to the A-E codes to obtain time sequence feedback T of a single coil on the action state of the control rod A ～T E . For T A ～T E Performing weighted calculation to obtain a weighted control rod moving rod time sequence value T: t=t A +0.7×T B +0.5×T C +0.1×T D The method comprises the steps of carrying out a first treatment on the surface of the When T is more than 0.789 seconds, the current moving rod direction is downward inserted, and the logic state is set to be 1; if T is less than or equal to 0.789 seconds, the current moving rod direction is lifting, and the logic state is set to be 0;
if the opposite judgment standards of two or more times appear continuously under the corresponding logic states, resetting the current logic state and the recorded number of moving bars;
s4: creating a moving rod subgroup counter M Given rod position ：
When the moving rod direction is determined, a given rod position moving rod counter is created, and a given rod position group is created on the basis of the original time sequence to obtain a given rod position M with the time sequence Given rod position ；
(4) The hardware simulation module 42 performs digital simulation on the absolute value of the hardware circuit of the Gray code card and the low-pass filter circuit, and performs digital processing on the voltage waveform of the secondary coil of the rod position detector:
s1: carrying out data model absolute value processing on secondary coil signals acquired by the A-E codes of the rod position detectors;
s2: carrying out low-pass filtering treatment on the treated signals to obtain simulation waveforms cir_result consistent with the hardware circuit of the Gray code card; the output array of the circuit simulation maintains the same time sequence as the original signal;
(5) The data processing module 43 performs threshold judgment on the signal digitally processed in the step (4) on the premise of obtaining the action direction of the control rod and the given rod position counter, and obtains five-code threshold and threshold interval of the Gray code processor ABCDE:
comparing the dynamic threshold values of cir_result of the A-E codes, simulating the rod bit threshold value debugging within the threshold value setting range, and screening the dynamic threshold value result:
based on the ABCDE code voltage threshold setting range, comparing the threshold voltage with the output signal of the step (4) from the lowest voltage value, wherein the voltage value of the signal is recorded as 1 when the voltage value is higher than the threshold voltage, and as 0 when the voltage value is lower than the threshold voltage;
the A-E codes after threshold comparison are used for obtaining M under the threshold according to the Gray code coding rule Measuring rod position The method comprises the steps of carrying out a first treatment on the surface of the Given dynamic bar counter M in combination with creation Given rod position And the obtained M Measuring rod position And comparing, and calculating the jump and the number of times of linear disqualification. The jump calculation standard is as follows: skip= |m Given rod position -M Measuring rod position The judgment basis of one jump is as follows: skip is more than or equal to 8 steps. The jump condition is recorded in the full travel range, and the number of unqualified times is accumulated.
And (5) performing linearity judgment while calculating the skip.
The linearity calculation formula is: liner=M Given rod position -M Measuring the rod position;
the qualified standard range of linearity is: [7, -4] [5, -6] [6, -5]; if the Liner value is not in the qualified standard range, recording the failure. And in the full-stroke bar moving process, recording all the unqualified times, and accumulating the unqualified times.
After the linearity of the threshold is judged, the voltage value with the accuracy of 1mV is increased, and analysis and judgment are carried out one by one according to the judgment principle and the standard.
Wherein, the set range of the voltage threshold of the A code is 2.5 to 4.3 and V, B codes, the set range of the voltage threshold of the A code is 2.5 to 4.5 and V, C codes, the set range of the voltage threshold of the A code is 4.1 to 5.5 and V, D codes, the set range of the voltage threshold of the A code is 4.5 to 6.5 and V, E codes, and the set range of the voltage threshold of the A code is 6.8 to 8.5V.
(6) And finishing the threshold setting process and outputting a visual threshold adjustment interval:
if the sum of the jump times and the linearity disqualification times is less than 5, outputting the threshold value; if the sum of the jump times and the linearity disqualification times is more than or equal to 5, sequentially listing the corresponding threshold values of the disqualification times from low to high.
(7) Sequentially measuring and adjusting a A, B, C, D, E-code potentiometer on a front panel of the Gray code processing clamp according to the threshold interval provided in the step (6), so that the output voltage value of the LDO power supply chip of each code is within the threshold interval;
(8) Further moving the stick to verify the self threshold accuracy of the Gray code card: the control rod is allowed to run a full stroke, further verifying the accuracy of the threshold.
The beneficial effects obtained by the invention are as follows:
1. according to the invention, only 2-3 full-stroke movable bars are needed, so that the efficiency and accuracy of setting the Gray code processing clamp threshold of the existing bar position system can be effectively improved, the linearity adjustment time of the bar position measurement channel is reduced, and the functional reliability of the system is improved.
2. Based on the digital intelligent analysis and calculation threshold result, maintenance work can be standardized, and safety risk is reduced.
Claims (11)
1. The utility model provides a nuclear power station rod position system Gray code processing fastener threshold value setting device, sets up between excellent position detector (01) and excellent position machine case (02), its characterized in that: the system comprises a signal acquisition interface module (10), a signal acquisition module (20), a signal preprocessing module (30) and an engineer station (40); the signal acquisition interface module (10) is connected in series between the rod position detector (01) and the rod position machine box (02), and the signal acquisition module (20) is connected with the signal acquisition interface module (10); the signal preprocessing module (30) is connected with the engineer station (40); the wiring led out by one signal acquisition interface module (10) is provided with 6 cores, and 5 coils and a public end of the ABCDE code of one rod position detector are respectively corresponding to the wiring; a signal acquisition module (20) having four channels;
the using method of the device comprises the following steps:
(1) Connecting a signal acquisition interface module (10) to a rod position measuring cabinet of a threshold to be set;
(2) The signal acquisition module (20) acquires and records the voltage waveform of the secondary coil of the corresponding bar bundle of the bar position detector (01), sends the voltage waveform to the signal preprocessing module (30) to be converted into a CSV format file, and sends the CSV format file to the data receiving module (41) of the engineer station (40) through a network port on the preprocessing module (30) based on a TCP protocol;
(3) The data receiving module (41) receives the data from the preprocessing module (30) in the step (2), and after adding a corresponding time sequence_index to the data, the data are respectively sent to the data processing module (43) and the hardware simulation module (42); a data processing module (43) analyzes the received voltage waveform, determines the current control rod motion direction and creates a given rod position counter M Given rod position ；
(4) The hardware simulation module (42) is used for carrying out digital simulation on the absolute value of the hardware circuit of the Gray code card and the low-pass filter circuit and carrying out digital processing on the voltage waveform of the secondary coil of the rod position detector;
(5) The data processing module (43) carries out threshold judgment on the signal digitally processed in the step (4) on the premise of obtaining the action direction of the control rod and the given rod position counter, and obtains the five-code threshold and the threshold interval of the Gray code processor ABCDE;
(6) And finishing the threshold setting process and outputting a visual threshold adjustment interval:
if the sum of the jump times and the linearity disqualification times is less than 5, outputting the threshold value; if the sum of the jump times and the linearity disqualification times is more than or equal to 5, sequentially listing corresponding thresholds of the disqualification times from low to high;
(7) Sequentially measuring and adjusting a A, B, C, D, E-code potentiometer on a front panel of the Gray code processing clamp according to the threshold interval provided in the step (6), so that the output voltage value of the LDO power supply chip of each code is within the threshold interval;
(8) Further moving the stick to verify the self threshold accuracy of the Gray code card: the control rod is allowed to run a full stroke, further verifying the accuracy of the threshold.
2. The nuclear power plant rod position system graham fastener threshold setting device of claim 1, wherein: the signal preprocessing module (30) is provided with a network port; the signal preprocessing module (30) is connected with the engineer station (40) through a network port; the signal preprocessing module (30) converts the ABCDE coil voltage waveform signals acquired by all the signal acquisition modules (20) into a CSV format file, and transmits the CSV format file to the engineer station (40) through a network port based on a TCP protocol.
3. The nuclear power plant rod position system graham fastener threshold setting device according to claim 2, wherein: the engineer station (40) comprises a data receiving module (41), a hardware simulation module (42), a data processing module (43) and a display output module (44).
4. The nuclear power plant rod position system Gray code processing clamp threshold setting device as claimed in claim 3, wherein: the data receiving module (41) receives the data from the signal preprocessing module (30), and after the corresponding time sequence time_index is added to the data, the data are respectively sent to the data processing module (43) and the hardware simulation module (42).
5. The nuclear power station rod position system Gray code processing clamp threshold setting device as claimed in claim 4, wherein: the hardware simulation module (42) is used for simulating the hardware circuit function of the Gray code card, and an output signal of the hardware simulation module (42) is transmitted to the data processing module (43).
6. The nuclear power station rod position system Gray code processing clamp threshold setting device as claimed in claim 5, wherein: the data processing module (43) analyzes the data from the signal preprocessing module (30) to obtain a given bar position counter M Given rod position The method comprises the steps of carrying out a first treatment on the surface of the The data processing module (43) compares the threshold value of the output signal of the hardware simulation module (42), outputs the lifting full-stroke measuring rod position after the comparison, compares the lifting full-stroke measuring rod position with a given rod position counter, and sets the current Gray code ABCDE threshold value.
7. The nuclear power plant rod position system Gray code processing clamp threshold setting device as claimed in claim 6, wherein: the display output module (44) displays the Gray code tuning result and the ABCDE coil voltage waveform.
8. The nuclear power plant rod position system gray code processing clamp threshold setting device as set forth in claim 7, wherein: the model of the signal and processing module (30) is crio-9048; the model of the signal acquisition module (20) is NI9229.
9. The nuclear power plant rod position system gray code processing clamp threshold setting device as set forth in claim 8, wherein: the step (3) comprises the following steps:
s1: data acquisition and signal validity judgment: the effectiveness of the acquired signals of the secondary coil is judged, and the judgment standard is as follows: d (RMS (E)/t) < score (loss (d (RMS)/t), W), wherein W is 0.8, E is the effective value of the E code waveform;
s2: data model processing and timestamp calculation:
sampling the A-E code feedback voltage waveforms acquired by the single rod position detector to obtain A-E code feedback voltage waveforms with consistent time sequences; performing time sequence data analysis by adopting a signal processing method of arithmetic average, norm and array analysis; carrying out weighted average and norm processing on the A code waveform to obtain a control rod action starting time stamp;
s3: and (3) performing weighted processing on the current feedback signals of the rod position acquisition coil and controlling rod lifting direction judgment:
performing time sequence calculation on voltage waveforms fed back by the rod position detector to the A-E codes to obtain time sequence feedback T of a single coil on the action state of the control rod A ～T E The method comprises the steps of carrying out a first treatment on the surface of the For T A ～T E Performing weighted calculation to obtain a weighted control rod moving rod time sequence value T: t=t A +0.7×T B +0.5×T C +0.1×T D The method comprises the steps of carrying out a first treatment on the surface of the When T is more than 0.789 seconds, the current moving rod direction is downward inserted, and the logic state is set to be 1; if T is less than or equal to 0.789 seconds, the current moving rod direction is lifting, and the logic state is set to be 0;
if the opposite judgment standards of two or more times appear continuously under the corresponding logic states, resetting the current logic state and the recorded number of moving bars;
s4: creating a moving rod subgroup counter M Given rod position ：
When the moving rod direction is determined, a given rod position moving rod counter is created, and a given rod position group is created on the basis of the original time sequence to obtain a given rod position M with the time sequence Given rod position 。
10. The nuclear power plant rod position system graham fastener threshold setting device of claim 9, wherein: the step (4) comprises:
s1: carrying out data model absolute value processing on secondary coil signals acquired by the A-E codes of the rod position detectors;
s2: carrying out low-pass filtering treatment on the treated signals to obtain simulation waveforms cir_result consistent with the hardware circuit of the Gray code card; the output array of the circuit simulation maintains the same time sequence as the original signal.
11. The nuclear power plant rod position system gray code processing clamp threshold setting device as set forth in claim 10, wherein: the specific process of the step (5) is as follows:
comparing the dynamic threshold values of cir_result of the A-E codes, simulating the rod bit threshold value debugging within the threshold value setting range, and screening the dynamic threshold value result:
based on the ABCDE code voltage threshold setting range, comparing the threshold voltage with the output signal of the step (4) from the lowest voltage value, wherein the voltage value of the signal is recorded as 1 when the voltage value is higher than the threshold voltage, and as 0 when the voltage value is lower than the threshold voltage;
the A-E codes after threshold comparison are used for obtaining M under the threshold according to the Gray code coding rule Measuring rod position The method comprises the steps of carrying out a first treatment on the surface of the Given dynamic bar counter M in combination with creation Given rod position And the obtained M Measuring rod position Comparing, and calculating the jump and the number of times of linear disqualification; the jump calculation standard is as follows: skip= |m Given rod position -M Measuring rod position The judgment basis of one jump is as follows: skip is more than or equal to 8 steps; recording the jumping situation in the full travel range and accumulating the unqualified times;
performing linearity judgment while calculating the jump;
the linearity calculation formula is: liner=M Given rod position -M Measuring rod position ；
The qualified standard range of linearity is: [7, -4] [5, -6] [6, -5]; if the Liner value is not in the qualified standard range, recording once unqualified; in the full-stroke bar moving process, recording all unqualified times, and accumulating the unqualified times;
after the linearity of the threshold is judged, the voltage value with the accuracy of 1mV is increased, and analysis and judgment are carried out one by one according to the judgment principle and the standard;
wherein, the set range of the voltage threshold of the A code is 2.5 to 4.3 and V, B codes, the set range of the voltage threshold of the A code is 2.5 to 4.5 and V, C codes, the set range of the voltage threshold of the A code is 4.1 to 5.5 and V, D codes, the set range of the voltage threshold of the A code is 4.5 to 6.5 and V, E codes, and the set range of the voltage threshold of the A code is 6.8 to 8.5V.
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