CN112509718A - Gray code processing clamping piece threshold setting device and method for nuclear power station rod position system - Google Patents
Gray code processing clamping piece threshold setting device and method for nuclear power station rod position system Download PDFInfo
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- CN112509718A CN112509718A CN202011378782.4A CN202011378782A CN112509718A CN 112509718 A CN112509718 A CN 112509718A CN 202011378782 A CN202011378782 A CN 202011378782A CN 112509718 A CN112509718 A CN 112509718A
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention provides a Gray code processing clamping piece threshold setting device for a nuclear power station rod position system. The signal acquisition interface module leads out the voltage waveform of the ABCDE coil of the rod position detector and sends the voltage waveform to the signal acquisition module and the signal preprocessing module. And the signal preprocessing module converts the ABCDE coil voltage waveform signals acquired by the signal acquisition module into a CSV format file and sends the CSV format file to an engineer station through a network port based on a TCP protocol. And the engineer station is used for processing and calculating the ABCDE code coil voltage waveform signal and displaying the finally calculated threshold. The invention also provides a Gray code processing fastener threshold setting method for the nuclear power station rod position system. The invention can effectively improve the efficiency and the accuracy of setting the threshold of the Gray code processing clamping piece 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 clamping piece threshold value of a nuclear power station rod position system.
Background
The position of the control rod can not be directly measured because the control rod bundle of the reactor is positioned in a high-temperature and high-pressure environment of a loop, at present, the position of the control rod is generally measured by adopting the electromagnetic induction principle in domestic pressurized water reactor nuclear power plants, the rod position detector is developed according to the principle, and the structure of the rod position detector comprises three coils of a primary coil, a secondary coil and an auxiliary coil (also called compensation coils), a coil framework, an inner barrel and an outer barrel and other parts, wherein the coil framework, the inner barrel and the outer barrel are made of low-permeability materials. Taking 61 rod position detectors of Fuqing nuclear power 5 and 6 units as examples, the coil of the rod position detector is wound, a secondary coil and a compensation coil are firstly wound on a coil framework, the winding directions of the 33 coils are consistent, each coil is wound by a polyimide enameled wire with the wire diameter of 0.224mm, the number of turns of the coil is 1700 +/-10 turns, 31 secondary coils are provided, and 2 compensation coils are provided. Then, a layer of primary coil is tightly wound on the coil framework, the primary coil covers 33 coils, and the coils are wound by SBF260 high-temperature resistant winding wires with the diameter of 1.97 mm. The primary coils and the 33 coils are insulated by half-overlapping polyimide glass varnished cloth.
It is known that when a rod position detector is operated, a primary coil is excited by an alternating current of 50Hz to generate an alternating magnetic field inside the detector, and this magnetic field causes an induced voltage to be generated in a secondary coil, and when the excitation current is constant, if a magnetic driving rod passes through the secondary coil, the induced voltage of the secondary coil will change significantly: 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 induced voltage is large, so that the position of the top of the driving rod can be known by monitoring the induced voltage of the secondary coil at a certain position.
It is known that the magnetic drive rod has a mechanical step size of 15.875mm each, and the resolution of the rod position detector is 8 mechanical steps, i.e. 127mm, i.e. 31 secondary coils equally spaced at 127 mm. The secondary 31 coils are divided into A, B, C, D, E five gray codes, with the encoded coil numbers from top to bottom as follows:
group a consists of 16 coils: 1#, 3#, 5# … … 29#, 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#, 24 #;
group E consists of 1 coil: 16# (middle coil).
FIG. 1 of the accompanying drawings shows the coil position distribution and connection relationship of the disclosed rod position detector.
The position signal of the control rod is composed of five-bit gray codes, and when the driving rod moves from one coil interval to another coil interval, only one bit of the gray codes changes, so that the probability of error occurrence is greatly reduced, and the abnormal operation of the group of coils can be quickly positioned.
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 (MCP10) and a Gray code processing clamping piece (MCP22), and the MCP10 mainly has the functions of providing 50Hz VAC exciting current for a primary coil of a detector, carrying out negative feedback regulation according to the induced voltage of a compensation coil and providing a relatively stable alternating magnetic field for a secondary coil. The MCP22 mainly has the function of setting the output signal of the secondary coil of the detector to form a regular Gray code rectangular pulse signal so as to display the rod position.
The gray code processing card is used for carrying out absolute value and filtering processing on the AC voltage waveform of the secondary A, B, C, D, E code coil, shaping and outputting an AC signal into a positive voltage signal, comparing the positive voltage signal with a threshold voltage output by the adjustable LDO power supply chip, and outputting a corresponding gray code.
Rod position measurement channel performance qualification is an important task at reactor startup during commissioning and each overhaul. The gray code processing clamping piece does not have the functions of digitalization and intellectualization at present, the gray code threshold voltage is manually adjusted only by depending on the working experience of debugging/maintaining workers, the adjustment precision is very low, repeated adjustment is needed, the rod lifting/inserting is carried out for multiple times for verification until the linearity of the rod position measuring system meets the requirement, the threshold setting work can be completed only by carrying out 17 full-stroke rod moving operations on average on a single rod group at the rod moving speed of 20 steps/minute, the rod position threshold setting work can be completed only in a time limit of at least more than 8 days according to the debugging result of a preorder unit, and the time consumption of the whole process is long.
Therefore, it is necessary to develop a method and a device for setting the gray code clamping piece threshold of the rod position system of the nuclear power plant, which can solve the above problems.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a device and a method for setting the Gray code processing clamping piece threshold value of the nuclear power station rod position system, so that the precision of the Gray code processing clamping piece threshold value setting is improved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a Gray code processing clamping piece threshold setting device for a nuclear power station rod position system is arranged between a rod position detector and a rod position case; 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 in series between the rod position detector and the rod position case, and the signal acquisition module is connected with the signal acquisition interface module. The signal acquisition interface module leads out the voltage waveform of the ABCDE coil 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 an engineer station.
The wiring led out by one signal acquisition interface module is provided with 6 cores which respectively correspond to 5 coils of an ABCDE code of a rod position detector and a public end.
A single signal acquisition module has four channels, a rod position detector signal needs to occupy five channels, and a total of 45 channels and 12 signal acquisition modules are needed for simultaneously acquiring 9 rod position detector signals.
The signal preprocessing module is provided with a network port. The signal preprocessing module is connected with an engineer station through a network port. And the signal preprocessing module converts the ABCDE coil voltage waveform signals acquired by the signal acquisition module into a CSV format file and sends the CSV format file to an 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. And the engineer station is used for processing and calculating the ABCDE code coil voltage waveform signal and displaying the finally calculated threshold.
And the data receiving module receives the data from the signal preprocessing module, adds the corresponding time sequence time _ index to the data and respectively sends the data to the data processing module and the hardware simulation module. And after the processing, the display module outputs and displays a final rod position threshold setting result.
The hardware simulation module is used for simulating the hardware circuit function of the Gray code clamping piece, and the output signal of the hardware simulation module is 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 MPosition of given rod. And 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.
And 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 NI 9229.
The invention also provides a gray code processing clamping piece threshold value setting method for the rod position system of the nuclear power station by using the gray code processing clamping piece threshold value setting device for the rod position system of the nuclear power station, which comprises the following steps:
(1) connecting a signal acquisition interface module to a rod position measuring cabinet with a threshold to be set;
(2) the signal acquisition module acquires and records voltage waveforms of the corresponding rod bundle secondary coils of the rod position detector, transmits the voltage waveforms to the signal preprocessing module to convert the voltage waveforms into CSV format files, and transmits the CSV format files 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), adds the corresponding time sequence time _ index to the data, and respectively sends the data to the data processing module and the hardware simulation module; the data processing module analyzes the received voltage waveform, judges the current control rod action direction and creates a given rod position counter MPosition of given rod：
S1: data acquisition and signal validity judgment: and judging the effectiveness of the collected signals of the secondary coil, wherein the judgment standard is as follows: d (RMS (E)/t) < score (loss (d (RMS) (E)/t), W, wherein W is 0.8 and 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 collected by a single rod position detector to obtain the A-E code feedback voltage waveforms of consistent time sequence; performing time series 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 timestamp;
s3: weighting the current feedback signals of the rod position acquisition coils and judging the lifting direction of the control rods:
the voltage waveform of the A-E code fed back by the rod position detector is subjected to time sequence calculation to obtain the time sequence feedback T of the single coil to the control rod action stateA～TE. For TA～TEAnd (3) carrying out weighting calculation to obtain a weighted control rod moving rod time sequence value T: t ═ TA+0.7×TB+0.5×TC+0.1×TD(ii) a When T is more than 0.789 second, the current moving rod direction is downward insertion, 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 0;
if the opposite judgment standards continuously appear twice or more in the corresponding logic state, resetting the current logic state and the recorded times of the moving rod;
s4: creating a moving stick subgroup counter MPosition of given rod：
After the moving rod direction is determined, a given rod position moving rod counter is established, a given rod position array is established on the basis of the original time sequence, and a given rod position M with a time sequence is obtainedPosition of given rod；
(4) The hardware simulation module carries out digital simulation on the absolute value of a hardware circuit of the Gray code clamping piece and the low-pass filter circuit, and carries out digital processing on the voltage waveform of a secondary coil of the rod position detector:
s1: processing the absolute value of a data model of secondary coil signals acquired by the A-E codes of the rod position detector;
s2: performing low-pass filtering on the processed signals to obtain a simulated waveform cir _ result consistent with a hardware circuit of the Gray code card; the output array of the circuit analog simulation keeps the same time sequence with the original signal;
(5) and (3) the data processing module judges the threshold of the signal after the digital processing in the step (4) on the premise of obtaining the control rod action direction and giving a rod position counter to obtain the threshold and the threshold interval of the code ABCDE of the Gray code processor:
comparing dynamic threshold values of cir _ result of the A-E codes, simulating rod position threshold value debugging in a threshold value setting range, and screening dynamic threshold value results:
comparing the voltage value of the ABCDE code voltage threshold value with the voltage value of the output signal in the step (4) from the lowest voltage value on the basis of the setting range of the ABCDE code voltage threshold value, and recording that the signal voltage value is higher than the threshold voltage as 1 and lower than the threshold voltage as 0;
obtaining M under the threshold value according to the Gray code coding rule for the A-E codes after the threshold value comparisonMeasuring the position of the stick(ii) a Given trick-stick counter M created in connection withPosition of given rodAnd the resulting MMeasuring the position of the stickAnd comparing to calculate the times of jumping and linear disqualification. The jumping calculation standard is as follows: skip is MPosition of given rod-MMeasuring the position of the stickAnd the basis for judging one-time jumping is as follows: skip is more than or equal to 8 steps. And recording the step skipping condition in the full travel range, and accumulating the unqualified times.
And when the step skipping is calculated, judging the linearity.
The linearity calculation formula is as follows: liner ═ MPosition of given rod-MMeasuring the rod position;
the linearity qualified standard range is as follows: [7, -4] [5, -6] [6, -5 ]; if the Liner value is not in the qualified standard range, recording the Liner value as unqualified. And in the process of moving the rod in the full stroke, recording all unqualified times, and accumulating the unqualified times.
After the linearity of the threshold is judged, the voltage value with the precision of 1mV is gradually increased, and the analysis and judgment are carried out one by one according to the judgment principle and the standard.
Wherein the code voltage threshold setting range of the A code voltage threshold is 2.5-4.3V, B code voltage threshold setting range is 2.5-4.5V, C code voltage threshold setting range is 4.1-5.5V, D code voltage threshold setting range is 4.5-6.5V, E code voltage threshold setting range is 6.8-8.5V.
(6) Finishing the threshold setting process and outputting a visual threshold adjustment interval:
if the sum of the number of skipping steps and the number of unqualified linearity is less than 5, outputting the threshold value; and if the sum of the step skipping times and the linearity unqualified times is more than or equal to 5, sequentially listing the corresponding threshold values of the unqualified times from low to high.
(7) Sequentially measuring and adjusting A, B, C, D, E-code potentiometers on the front panel of the Gray code processing card according to the threshold interval provided in the step (6), so that the output voltage value of each code of LDO power supply chip is within the threshold interval;
(8) further moving the stick to verify the self threshold accuracy of the gray code clamping piece: the accuracy of the threshold is further verified by running the control rod through a full stroke.
The beneficial effects obtained by the invention are as follows:
1. according to the invention, only 2-3 full-stroke moving rods are needed, so that the efficiency and accuracy of setting the threshold of the Gray code processing clamping piece of the conventional rod position system can be effectively improved, the linearity adjusting time of a rod position measuring channel is reduced, and the functional reliability of the system is improved.
2. Based on the threshold value result of digital intelligent analysis calculation, maintenance work can be standardized, and safety risk is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a Gray code processing card threshold setting device of a nuclear power station rod position system;
FIG. 2 is a flow chart of a Gray code processing card threshold setting method for a nuclear power station rod position system.
In the figure: 01 is a rod position detector; 02 is a rod position case; 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; and the Timing _ amax and the Timing _ amin are waveform voltage maximum and minimum values.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in fig. 1-2, the invention provides a gray code processing clamping piece threshold setting device for a nuclear power station rod position system, which is arranged between a rod position detector 01 and a rod position 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 case 02, and the signal acquisition module 20 is connected with the signal acquisition interface module 10. The signal acquisition interface module 10 extracts the voltage waveform of the ABCDE coil of the rod position detector 01 and sends the voltage waveform to the signal acquisition module 20 and the signal preprocessing module 30. The signal preprocessing module 30 is connected with an engineer station 40.
The wiring led out from one signal acquisition interface module 10 has 6 cores, and corresponds to 5 coils of the ABCDE code of the rod position detector and a public end respectively.
The single signal acquisition module 20 has four channels, one rod position detector signal occupies five channels, and a total of 45 channels are required for simultaneously 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 with the engineer station 40 through a network interface. The signal preprocessing module 30 converts the ABCDE coil voltage waveform signals acquired by all the signal acquisition modules 20 into a file in the CSV format, and sends the file to the engineer station 40 through a network interface 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 adds the corresponding time series time _ index to the data, and then sends the data to the data processing module 43 and the hardware simulation module 42, respectively. After the processing, the display module 44 outputs and displays the final rod 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 the given rod position counter MPosition of given rod. The data processing module 43 compares the threshold value of the output signal of the hardware simulation module 42, outputs the lifting full-stroke measurement rod position after comparison, compares the lifting full-stroke measurement rod position with a given rod position counter, and sets the current gray code ABCDE threshold value.
The display output module 44 displays the gray code setting result and the ABCDE coil voltage waveform.
The signal and processing module 30 is of the type crio-9048.
The model of the signal acquisition module 20 is NI 9229.
The invention also provides a gray code processing clamping piece threshold value setting method for the rod position system of the nuclear power station by using the gray code processing clamping piece threshold value setting device for the rod position system of the nuclear power station, which comprises the following steps:
(1) the signal acquisition interface module 10 is connected to a rod position measuring cabinet with a threshold value to be set;
(2) the signal acquisition module 20 acquires and records the voltage waveform of the secondary coil of the rod bundle corresponding to the rod position detector 01, and sends the voltage waveform to the signal preprocessing module 30 to convert the voltage waveform into a file in a CSV format, and sends the 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 step (2), and adds the corresponding time sequence time _ index to the data, and then sends the data to the data processing module 43 and the hardware simulation module 42 respectively; the data processing module 43 analyzes the received voltage waveform, determines the current control rod motion direction and creates a given rod position counter MPosition of given rod：
S1: data acquisition and signal validity judgment: and judging the effectiveness of the collected signals of the secondary coil, wherein the judgment standard is as follows: d (RMS (E)/t) < score (loss (d (RMS) (E)/t), W, wherein W is 0.8 and 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 collected by a single rod position detector to obtain the A-E code feedback voltage waveforms of consistent time sequence; performing time series 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 timestamp;
s3: weighting the current feedback signals of the rod position acquisition coils and judging the lifting direction of the control rods:
the voltage waveform of the A-E code fed back by the rod position detector is subjected to time sequence calculation to obtain the time sequence feedback T of the single coil to the control rod action stateA～TE. For TA～TEAnd (3) carrying out weighting calculation to obtain a weighted control rod moving rod time sequence value T: t ═ TA+0.7×TB+0.5×TC+0.1×TD(ii) a When T is more than 0.789 second, the current moving rod direction is downward insertion, 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 0;
if the opposite judgment standards continuously appear twice or more in the corresponding logic state, resetting the current logic state and the recorded times of the moving rod;
s4: creating a moving stick subgroup counter MPosition of given rod：
After the moving rod direction is determined, a given rod position moving rod counter is established, a given rod position array is established on the basis of the original time sequence, and a given rod position M with a time sequence is obtainedPosition of given rod；
(4) The hardware simulation module 42 carries out digital simulation on the absolute value of the hardware circuit of the Gray code clamping piece and the low-pass filter circuit, and carries out digital processing on the voltage waveform of the secondary coil of the rod position detector:
s1: processing the absolute value of a data model of secondary coil signals acquired by the A-E codes of the rod position detector;
s2: performing low-pass filtering on the processed signals to obtain a simulated waveform cir _ result consistent with a hardware circuit of the Gray code card; the output array of the circuit analog simulation keeps the same time sequence with the original signal;
(5) and (3) on the premise of obtaining the control rod action direction and giving a rod position counter, the data processing module 43 performs threshold judgment on the signal subjected to the digital processing in the step (4) to obtain a gray code processor ABCDE five code threshold value and a threshold value interval:
comparing dynamic threshold values of cir _ result of the A-E codes, simulating rod position threshold value debugging in a threshold value setting range, and screening dynamic threshold value results:
comparing the voltage value of the ABCDE code voltage threshold value with the voltage value of the output signal in the step (4) from the lowest voltage value on the basis of the setting range of the ABCDE code voltage threshold value, and recording that the signal voltage value is higher than the threshold voltage as 1 and lower than the threshold voltage as 0;
obtaining M under the threshold value according to the Gray code coding rule for the A-E codes after the threshold value comparisonMeasuring the position of the stick(ii) a Given trick-stick counter M created in connection withPosition of given rodAnd the resulting MMeasuring the position of the stickAnd comparing to calculate the times of jumping and linear disqualification. The jumping calculation standard is as follows: skip is MPosition of given rod-MMeasuring the position of the stickAnd the basis for judging one-time jumping is as follows: skip is more than or equal to 8 steps. And recording the step skipping condition in the full travel range, and accumulating the unqualified times.
And when the step skipping is calculated, judging the linearity.
The linearity calculation formula is as follows: liner ═ MPosition of given rod-MMeasuring the rod position;
the linearity qualified standard range is as follows: [7, -4] [5, -6] [6, -5 ]; if the Liner value is not in the qualified standard range, recording the Liner value as unqualified. And in the process of moving the rod in the full stroke, recording all unqualified times, and accumulating the unqualified times.
After the linearity of the threshold is judged, the voltage value with the precision of 1mV is gradually increased, and the analysis and judgment are carried out one by one according to the judgment principle and the standard.
Wherein the code voltage threshold setting range of the A code voltage threshold is 2.5-4.3V, B code voltage threshold setting range is 2.5-4.5V, C code voltage threshold setting range is 4.1-5.5V, D code voltage threshold setting range is 4.5-6.5V, E code voltage threshold setting range is 6.8-8.5V.
(6) Finishing the threshold setting process and outputting a visual threshold adjustment interval:
if the sum of the number of skipping steps and the number of unqualified linearity is less than 5, outputting the threshold value; and if the sum of the step skipping times and the linearity unqualified times is more than or equal to 5, sequentially listing the corresponding threshold values of the unqualified times from low to high.
(7) Sequentially measuring and adjusting A, B, C, D, E-code potentiometers on the front panel of the Gray code processing card according to the threshold interval provided in the step (6), so that the output voltage value of each code of LDO power supply chip is within the threshold interval;
(8) further moving the stick to verify the self threshold accuracy of the gray code clamping piece: the accuracy of the threshold is further verified by running the control rod through a full stroke.
The beneficial effects obtained by the invention are as follows:
1. according to the invention, only 2-3 full-stroke moving rods are needed, so that the efficiency and accuracy of setting the threshold of the Gray code processing clamping piece of the conventional rod position system can be effectively improved, the linearity adjusting time of a rod position measuring channel is reduced, and the functional reliability of the system is improved.
2. Based on the threshold value result of digital intelligent analysis calculation, maintenance work can be standardized, and safety risk is reduced.
Claims (12)
1. The utility model provides a nuclear power station rod position system gray code processing fastener threshold value setting device, sets up between rod position detector (01) and rod 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 case (02), and the signal acquisition module (20) is connected with the signal acquisition interface module (10); the signal preprocessing module (30) is connected with an engineer station (40); the wiring led out by one signal acquisition interface module (10) is provided with 6 cores which respectively correspond to 5 coils of an ABCDE code of a rod position detector and a public end; a signal acquisition module (20) has four channels.
2. The gray code processing card member threshold setting device for the rod position system of the nuclear power plant as claimed in claim 1, wherein: the signal preprocessing module (30) is provided with a network port; the signal preprocessing module (30) is connected with an 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 sends the CSV format file to an engineer station (40) through a network interface based on a TCP protocol.
3. The gray code processing card clamping member threshold setting device of the nuclear power station rod position system of claim 2, characterized in that: 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 gray code processing card clamping member threshold setting device of the nuclear power station rod position system of claim 3, characterized in that: the data receiving module (41) receives the data from the signal preprocessing module (30), adds the corresponding time sequence time _ index to the data, and respectively sends the data to the data processing module (43) and the hardware simulation module (42).
5. The nuclear power plant rod position system gray code processing card threshold setting device of claim 4, wherein: the hardware simulation module (42) is used for simulating the hardware circuit function of the Gray code clamping piece, and the output signal of the hardware simulation module (42) is transmitted to the data processing module (43).
6. The nuclear power plant rod position system gray code processing card threshold setting device of claim 5, wherein: the data processing module (43) analyzes the data from the signal preprocessing module (30) to obtain a given rod position counter MPosition of given rod(ii) a The data processing module (43) compares the threshold value of the output signal of the hardware simulation module (42), and outputs the lifting full-stroke measurement rod position and lifting after comparisonAnd comparing the reduced full-stroke measurement rod position with a given rod position counter, and setting the current Glare code ABCDE threshold value.
7. The nuclear power plant rod position system gray code processing card threshold setting device of claim 6, wherein: and the display output module (44) displays the Gray code setting result and the ABCDE coil voltage waveform.
8. The nuclear power plant rod position system gray code processing card threshold setting device of claim 7, wherein: the type of the signal and processing module (30) is crio-9048; the model of the signal acquisition module (20) is NI 9229.
9. A nuclear power station rod position system gray code processing fastener threshold setting method using the nuclear power station rod position system gray code processing fastener threshold setting device according to claim 8, characterized in that: the method comprises the following steps:
(1) connecting a signal acquisition interface module (10) to a rod position measuring cabinet with a threshold to be set;
(2) the signal acquisition module (20) acquires and records the voltage waveform of a rod bundle secondary coil corresponding to the rod 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), adds the corresponding time sequence time _ index to the data, and respectively sends the data 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 MPosition of given rod；
(4) The hardware simulation module (42) carries out digital simulation on the absolute value of a hardware circuit of the Gray code clamping piece and the low-pass filter circuit, and carries out digital processing on the voltage waveform of a secondary coil of the rod position detector;
(5) the data processing module (43) judges the threshold of the signal after the digital processing in the step (4) on the premise of obtaining the control rod action direction and giving a rod position counter to obtain the threshold and the threshold interval of the Gray code processor ABCDE;
(6) finishing the threshold setting process and outputting a visual threshold adjustment interval:
if the sum of the number of skipping steps and the number of unqualified linearity is less than 5, outputting the threshold value; if the sum of the number of skipping steps and the number of unqualified linearity is more than or equal to 5, sequentially listing the corresponding thresholds of the unqualified times from low to high;
(7) sequentially measuring and adjusting A, B, C, D, E-code potentiometers on the front panel of the Gray code processing card according to the threshold interval provided in the step (6), so that the output voltage value of each code of LDO power supply chip is within the threshold interval;
(8) further moving the stick to verify the self threshold accuracy of the gray code clamping piece: the accuracy of the threshold is further verified by running the control rod through a full stroke.
10. The method of claim 9 for setting gray code processing fastener threshold values of a nuclear power plant rod position system, wherein: the step (3) comprises the following steps:
s1: data acquisition and signal validity judgment: and judging the effectiveness of the collected signals of the secondary coil, wherein the judgment standard is as follows: d (RMS (E)/t) < score (loss (d (RMS) (E)/t), W, wherein W is 0.8 and 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 collected by a single rod position detector to obtain the A-E code feedback voltage waveforms of consistent time sequence; performing time series 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 timestamp;
s3: weighting the current feedback signals of the rod position acquisition coils and judging the lifting direction of the control rods:
the voltage waveform of the A-E code fed back by the rod position detector is subjected to time sequence calculation to obtainTime series feedback T of single coil to control rod action stateA～TE(ii) a For TA～TEAnd (3) carrying out weighting calculation to obtain a weighted control rod moving rod time sequence value T: t ═ TA+0.7×TB+0.5×TC+0.1×TD(ii) a When T is more than 0.789 second, the current moving rod direction is downward insertion, 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 0;
if the opposite judgment standards continuously appear twice or more in the corresponding logic state, resetting the current logic state and the recorded times of the moving rod;
s4: creating a moving stick subgroup counter MPosition of given rod：
After the moving rod direction is determined, a given rod position moving rod counter is established, a given rod position array is established on the basis of the original time sequence, and a given rod position M with a time sequence is obtainedPosition of given rod。
11. The method of claim 10 for setting gray code processing card threshold of a nuclear power plant rod position system, wherein: the step (4) comprises the following steps:
s1: processing the absolute value of a data model of secondary coil signals acquired by the A-E codes of the rod position detector;
s2: performing low-pass filtering on the processed signals to obtain a simulated waveform cir _ result consistent with a hardware circuit of the Gray code card; the output array of the circuit analog simulation keeps the same time sequence as the original signal.
12. The method of claim 11 for setting gray code processing fastener threshold values for nuclear power plant rod position systems, wherein: the specific process of the step (5) is as follows:
comparing dynamic threshold values of cir _ result of the A-E codes, simulating rod position threshold value debugging in a threshold value setting range, and screening dynamic threshold value results:
comparing the voltage value of the ABCDE code voltage threshold value with the voltage value of the output signal in the step (4) from the lowest voltage value on the basis of the setting range of the ABCDE code voltage threshold value, and recording that the signal voltage value is higher than the threshold voltage as 1 and lower than the threshold voltage as 0;
obtaining M under the threshold value according to the Gray code coding rule for the A-E codes after the threshold value comparisonMeasuring the position of the stick(ii) a Given trick-stick counter M created in connection withPosition of given rodAnd the resulting MMeasuring the position of the stickComparing, and calculating the times of jumping and linear disqualification; the jumping calculation standard is as follows: skip is MPosition of given rod-MMeasuring the position of the stickAnd the basis for judging one-time jumping is as follows: skip is more than or equal to 8 steps; recording the step skipping condition in the full travel range, and accumulating the unqualified times;
when the step skipping is calculated, judging the linearity;
the linearity calculation formula is as follows: liner ═ MPosition of given rod-MMeasuring the position of the stick；
The linearity qualified standard range is as follows: [7, -4] [5, -6] [6, -5 ]; if the Liner value is not in the qualified standard range, recording the Liner value as unqualified; recording all unqualified times in the full-stroke rod moving process, and accumulating the unqualified times;
after the linearity of the threshold is judged, the voltage value with the precision of 1mV is increased progressively, and the analysis and judgment are carried out one by one according to the judgment principle and the standard;
wherein the code voltage threshold setting range of the A code voltage threshold is 2.5-4.3V, B code voltage threshold setting range is 2.5-4.5V, C code voltage threshold setting range is 4.1-5.5V, D code voltage threshold setting range is 4.5-6.5V, E code voltage threshold setting range is 6.8-8.5V.
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