CN117678034A - Control rod position detection system and equipment - Google Patents
Control rod position detection system and equipment Download PDFInfo
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- CN117678034A CN117678034A CN202180100790.9A CN202180100790A CN117678034A CN 117678034 A CN117678034 A CN 117678034A CN 202180100790 A CN202180100790 A CN 202180100790A CN 117678034 A CN117678034 A CN 117678034A
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- 238000001514 detection method Methods 0.000 title claims abstract description 59
- 238000012545 processing Methods 0.000 claims abstract description 191
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- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
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- 229910052796 boron Inorganic materials 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
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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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- 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 control rod position detection system comprises rod position detectors (10), a power supply processing device (20) and an encoding processing device (30), wherein each rod position detector (10), one encoding processing device (30) and one power supply processing device (20) form a measurement channel, and the power supply processing device (20) carries out phase processing on power supply signals after receiving the power supply signals to obtain specific current signals which enable current interference signals of other rod position detectors (10) around any one rod position detector (10) to cancel each other and respectively send the specific current signals to the corresponding rod position detector (10); the control rod position detection equipment comprises a rod position detector (10), a power supply processing device (20), a coding processing device (30) and more than two measuring cabinets (100). Each rod position detector (10) generates induced voltage according to the corresponding current signal, and the final coding processing device (30) processes the induced voltage to obtain a position coding signal representing the position information of the control rod.
Description
The application relates to the technical field of nuclear reactors, in particular to a control rod position detection system and equipment.
Nuclear power generation is a way of generating electricity by using heat energy released by nuclear fission in a nuclear reactor, and is very similar to thermal power generation, except that a nuclear reactor and a steam generator are used for replacing a boiler for thermal power generation, and nuclear fission energy is used for replacing chemical energy of fossil fuel. At present, in many nuclear power units, power generation is mostly performed in the form of a pressurized water reactor of a nuclear power station.
In a reactor of a pressurized water reactor nuclear power plant, a control rod assembly is positioned in a high-temperature and high-pressure container, and the speed of a chain reaction can be controlled to a preset level by lifting and inserting the control rod, so that it is important to know the position of the control rod in real time. The rod position detector is a device for detecting the top position of a driving rod at the upper end of a control rod assembly by utilizing the electromagnetic induction principle, and obtaining the actual position of the control rod after signal processing by a rod position measuring device. The conventional rod position detector is generally a differential transformer type, also called a coil coding rod position detector, and the type of detector has inherent defects that the rod position signal is easily interfered by exciting currents of other surrounding rod position detectors due to the fact that signals are generated by electromagnetic induction, so that a final rod position measurement result is inaccurate.
Content of the application
According to various embodiments of the present application, a control rod position detection system and apparatus are provided.
A control rod position detection system comprising: a rod position detector; the power supply processing devices are respectively and correspondingly connected with the rod position detectors, each power supply processing device is respectively used for being connected with a power supply, and each power supply processing device is used for carrying out phase processing on current signals output by the power supply and outputting the processed current signals to the corresponding rod position detector so as to enable current interference signals of other rod position detectors around any rod position detector to be mutually counteracted; and each coding processing device is correspondingly connected with one rod position detector, and is used for receiving the induction voltage obtained when the rod position detector detects the position of the control rod according to the current output by the power supply processing device and obtaining a corresponding position coding signal according to the induction voltage.
In the control rod position detection system, each rod position detector, one coding processing device and one power supply processing device form a measurement channel, and after receiving the power supply signals, the power supply processing device carries out phase processing on the power supply signals to obtain specific current signals which enable current interference signals of other rod position detectors around any one rod position detector to cancel each other, and the specific current signals are respectively sent to the corresponding rod position detectors. Each rod position detector generates induced voltage according to the corresponding current signal, and the final coding processing device processes the induced voltage to obtain a position coding signal representing the position information of the control rod. According to the scheme, under the action of the specific current signals, the current interference signals of other rod position detectors around any one rod position detector can be mutually offset, so that the influence of the other rod position detectors around the rod position detector on rod position measurement is reduced or even eliminated, and the accuracy of a rod position measurement result is effectively improved.
A control rod position detection apparatus includes a rod position detector; the power supply processing devices are respectively and correspondingly connected with the rod position detectors, each power supply processing device is respectively used for being connected with a power supply and carrying out phase processing on current signals output by the power supply, and the power supply processing devices output the current signals subjected to the phase processing to the corresponding rod position detectors so that current interference signals of other rod position detectors around any rod position detector are mutually counteracted; the encoding processing devices are respectively and correspondingly connected with the rod position detector, the encoding processing devices receive the induced voltage obtained when the rod position detector detects the position of the control rod according to the current signal output by the power supply processing device, and the encoding processing devices obtain corresponding position encoding signals according to the induced voltage; and more than two measuring cabinet bodies, wherein more than two power supply processing devices and more than two coding processing devices are arranged in each measuring cabinet body.
According to the control rod position detection equipment, each rod position detector, one coding processing device and one power supply processing device form a measurement channel, and after receiving a power supply signal, the power supply processing device carries out phase processing on the power supply signal to obtain specific current signals which enable current interference signals of other rod position detectors around any one rod position detector to cancel each other, and the specific current signals are respectively sent to the corresponding rod position detector. Each rod position detector generates induced voltage according to the corresponding current signal, and the final coding processing device processes the induced voltage to obtain a position coding signal representing the position information of the control rod. According to the scheme, under the action of the specific current signals, the current interference signals of other rod position detectors around any one rod position detector can be mutually offset, so that the influence of the other rod position detectors around the rod position detector on rod position measurement is reduced or even eliminated, and the accuracy of a rod position measurement result is effectively improved.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the application will be apparent from the description and drawings, and from the claims.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will briefly introduce the drawings that are needed in the embodiments or the prior art descriptions, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a control rod position detection system according to an embodiment;
FIG. 2 is a schematic diagram of a rod position detector according to an embodiment;
FIG. 3 is a schematic diagram of a rod position detector according to an embodiment in which the rod position detector is disturbed by other rod position detector currents;
FIG. 4 is a schematic diagram of waveforms of a "beat wave" of two different frequency signal combinations;
FIG. 5 is a diagram of power supply phase distribution for a rod position detector in a top stack according to one embodiment;
FIG. 6 is a diagram of a power processing device frequency phase control network connection according to one embodiment;
FIG. 7 is a schematic diagram of an encoding processing apparatus according to an embodiment;
FIG. 8 is a schematic diagram of a control rod position detection system according to another embodiment;
FIG. 9 is a schematic diagram of a control rod position detection system according to another embodiment;
FIG. 10 is a schematic diagram showing a front structure of a control rod position detecting apparatus according to an embodiment;
FIG. 11 is a schematic view showing a back structure of a control rod position detecting apparatus in one embodiment.
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, a control rod position detection system includes: a rod position detector 10; the power supply processing devices 20 are respectively and correspondingly connected with the rod position detectors 10, each power supply processing device 20 is respectively used for being connected with a power supply and carrying out phase processing on current signals output by the power supply, and the power supply processing devices 20 output the current signals after the phase processing to the corresponding rod position detector 10 so that current interference signals of other rod position detectors 10 around any rod position detector 10 are mutually counteracted; and each coding processing device 30 is correspondingly connected with one rod position detector 10, the coding processing device 30 receives the induced voltage when the rod position detector 10 detects the control rod position according to the current signal output by the power supply processing device 20, and the coding processing device 30 obtains a corresponding position coding signal according to the induced voltage.
In particular, in pressurized water reactors, the control rods are typically made of materials such as boron and cadmium that are prone to absorb neutrons. A set of mechanical device is arranged outside the nuclear reaction pressure vessel and can operate the control rod, and when the control rod is completely inserted into the reaction center, a large amount of neutrons can be absorbed to prevent the fission chain reaction. If the control rod is pulled out a little, the reactor starts to operate, and the speed of the chain reaction reaches a certain stable value; if the energy released by the reactor is to be increased, the control rod is only required to be extracted a little more, so that absorbed neutrons are reduced, and more neutrons participate in the fission reaction. The chain reaction is stopped, and the control rod is completely inserted into the nuclear reaction center to absorb most neutrons.
In order to monitor the position of the control rod inserted into the reaction center, it is generally necessary to perform a position detection operation of the control rod by means of the rod position detector 10 so that the user can control the control rod to be moved to an appropriate position according to the actually required chain reaction rate. The particular type of rod position detector 10 is not unique so long as the change in position of the control rod is accurately manifested. For example, in one more detailed embodiment, a coil-coded rod position detector may be used, where the primary coil of the coil-coded rod position detector is coupled to the power processing device 20 and the secondary coil of the coil-coded rod position detector is coupled to the encoding processing device 30.
Specifically, referring to fig. 2 in combination, the coil-coded rod position detector generally includes a set of primary coils and a plurality of secondary coils, wherein the number of the secondary coils is generally five, and the secondary coils in each set are respectively A, B, C, D, E and are reversely connected in series. When the coil coding rod position detector works, the primary coil is connected with an alternating current power supply, and when the control rod driving rod moves in the coil coding rod position detector, the control rod passes through one secondary coil in the same group, the induction voltage on the coils of the group is high, and passes through two secondary coils, and the induction voltage is low. With the movement of the driving rod, the 5 groups of secondary coils are induced to have alternating high and low levels, the high and low levels are indicated by '1' and '0', the codes are just 5-bit codes, and different values of the codes represent different rod positions (control rod positions).
It will be appreciated that the particular form of the position-coded signal is not unique and in a more detailed embodiment the position-coded signal may be a gray code. Taking a coil coding type rod position detector as an example, along with the movement of a driving rod, alternating high and low levels are induced on 5 groups of secondary coils, the high and low levels are represented by '1' and '0', at the moment, the high and low levels are just 5-bit Gray codes, and different values of the Gray codes represent different rod positions.
The resolution of the coil coding type rod position detector is +/-4 steps (15.875 mm in each step), and the precision of an actual rod position measuring system is +/-6 steps, namely +/-95.25 mm. The output signal of the coil coding rod position detector has the following two main problems: one is that at the top of the reactor, when a plurality of coil coding rod position detectors work simultaneously, because of the close distance, mutual interference can be generated between adjacent coil coding rod position detectors. Through actual measurement in the power station, under rated working current, the interference signals generated by two adjacent coil coding type rod position detectors are about 2% of the actual rod position signals, and if all the detectors work simultaneously, the amplitude of the interference signals can reach about 15% of the actual rod position signals, and the actual measured waveforms are shown in fig. 3. Because the frequency of the interference signal is very close to that of the bar position signal, the filtering circuit cannot effectively filter out the interference signal, and the interference signal often causes the bar position indication jump near the bar position switching point. Secondly, when the control rod is lifted and inserted, the control rod driving mechanism moves rod current to interfere the rod position signal, so that the rod position signal which is theoretically power frequency induced voltage is deviated, part of the interference signal remains after filtering due to low frequency, and the interference signal can cause rod position indication jump when the interference signal is near a rod position switching point.
In the control rod position detection system provided by the application, the rod position detector 10, the power supply processing device 20 and the coding processing device 30 are in one-to-one correspondence, namely, a rod position detection channel is formed by the rod position detector 10, the power supply processing device 20 and the coding processing device 30, so that the position detection operation of a control rod is realized. In order to avoid mutual interference between current signals input by different rod position detectors 10 and influence actual measurement accuracy when a plurality of rod position detection channels run simultaneously, according to the scheme of the application, from the angle of the current signals input by different rod position detectors 10, the current signals output to each rod position detector 10 by the power supply processing device 20 are subjected to phase processing, so that interference components generated by the current signals input by other rod position detectors 10 can cancel each other around any rod position detector 10, and finally the influence of the current interference signals on the rod position detector 10 is eliminated.
Under the condition that the rod position detector 10 has no current interference, the position detection of the control rod is started according to the current signal output by the power supply processing device 20 connected with the rod position detector, after each rod position detector 10 receives the corresponding current signal, corresponding induced voltages are generated according to different positions where the control rod is positioned at the moment, and after the induced voltages are obtained, the encoding processing device 30 performs corresponding encoding processing, and finally, the position information corresponding to each control rod can be obtained.
It will be appreciated that the manner in which the current interference signals of the other rod position detectors 10 around any one rod position detector 10 cancel each other is not unique, and that for ease of understanding, in one embodiment of the present application this may be achieved by inputting current signals of the same frequency and 180 degrees out of phase to the other rod position detectors 10 around any one rod position detector 10. That is, in one embodiment, the current interference signals of the other rod position detectors 10 around any one rod position detector 10 cancel each other out, including: of the current signals input from other rod position detectors 10 around any one of the rod position detectors 10, the number of rod position detectors 10 inputting a first current signal is equal to the number of rod position detectors 10 inputting a second current signal, and the first current signal and the second current signal are equal in frequency and 180 degrees out of phase.
Specifically, in the existing rod position measuring device, the power frequency power supplies for supplying power to the rod position detector 10 are respectively independent sinusoidal signal generators, so that the frequencies of the power supplies of different rod position detectors 10 are close to the power frequency but have differences, and the phases of the power supplies are randomly determined when the power supplies are electrified. The bar position signal can be written asThe interference signal can be written as The bar position signal after the superposition of the single interference signal can be written into The waveform of the signal after the single disturbance is superimposed is a "beat wave" whose amplitude varies periodically with time, as shown in fig. 4. The waveform obtained by superposing a plurality of interference signals on a certain rod position signal (at rated working current) of the actual measurement nuclear power station is that the amplitude becomesMore complex "beats" are made, as shown in fig. 2. The measured rod position signal waveform corresponds to the generation of ripple waves on the rod position signal with unchanged amplitude. Because the beat frequencies of the ripple waves are small, the ripple waves are difficult to filter through a back-end filter circuit. If the bar bit is in the vicinity of the switching point, the ripple voltage may from time to time cross the upper and lower threshold voltages, causing the bar bit to indicate a jump.
As known from the principle of signal synthesis, if two signals have the same frequency and 180 degrees out of phase, the amplitude of the superimposed signal is the difference between the two amplitudes. Therefore, the present embodiment allows interference signals between all detectors on top of the reactor to be cancelled as much as possible by controlling the power frequency and phase of the rod position detector 10.
The power supply processing device 20 of the present embodiment has a frequency-phase processing function, and the power supply processing device 20 can convert an input power supply signal into a current signal with a corresponding frequency and phase, specifically, can perform a phase shift process on the power supply signal so that the current signals output to the rod position detectors 10 are 180 degrees out of phase. In the same control rod position detection system, one power supply processing device 20 may be used to control other power supply processing devices 20 to output current signals with the same frequency and a specific phase, and in this case, it is necessary to connect the respective power supply processing devices 20 in communication. In order to ensure that the interference signals of all the rod position detectors 10 are superimposed and offset as much as possible, the first current signal and the second current signal need to be distributed to the power supply current of all the rod position detectors 10, and the quantity of the first current signal and the second current signal in the input current of other rod position detectors 10 around any one rod position detector 10 is ensured to be equal.
It should be noted that there are various methods of phase distribution of the current signal input by each rod position detector 10, and that fig. 5 discloses a scheme in which smaller circles indicate rod position detectors 10 of the first current signal type are input, and larger circles indicate rod position detectors 10 of the second current signal type are input. The scheme ensures that two first current signals and two second current signals are respectively arranged in the current signals of 4 rod position detectors 10 around each rod position detector 10, thereby ensuring that the current and interference signals of the 4 rod position detectors 10 around the rod position detector 10 are mutually counteracted, and the influence of the current and the interference signals is 0.
Further, since the number of rod position detectors 10 adjacent to the rod position detector 10 on the outermost layer is less than 4, it is only necessary to ensure that the number of the first current signals inputted to the rod position detectors 10 around the rod position detectors is as large as possible, and the number of the second current signals inputted to the rod position detectors is equal to the number of the first current signals. By controlling the frequency and phase of the power supply of the different rod position detectors 10 as described above, the interference caused by the mutual influence of the rod position detectors 10 can be reduced to 30% or less of the original interference. At the individual detectors, the number of the surrounding first current signals and the surrounding second current signals is almost equal and the distances are symmetrical, and the interference signals can be reduced to be close to 0. Setting the return difference through the subsequent voltage threshold comparison circuit can basically eliminate the rod position indication jump caused by the mutual influence of the rod position detector 10.
It will be appreciated that the specific phase angles of the first current signal and the second current signal are not unique, as long as the two are guaranteed to be 180 degrees out of phase on the basis of equal frequencies. For example, in one embodiment, the phase of the first current signal is 0 degrees and the phase of the second current signal is 180 degrees. At this time, the phases of the first current signal and the second current signal are respectively set to 0 degree and 180 degrees, so that the control is simple and easy to realize.
In one embodiment, the power supply processing devices 20 are each provided with more than two network interfaces, different network interfaces correspond to different control network types, and the same network interfaces in each power supply processing device 20 are connected to each other.
Specifically, in the scheme of the present embodiment, in order to realize communication of the respective power supply processing apparatuses 20, the output current frequency and phase adjustment operation of the other power supply processing apparatuses 20 can be realized by one of the power supply processing apparatuses 20. By the scheme of this embodiment, a plurality of different network interfaces are set, and different networks are respectively connected, so that when any network interface fails, the power supply processing device 20 can still select other network interfaces according to a preset priority order, and output current frequency and phase adjustment of the power supply processing device 20 are realized by using other types of control networks. By the scheme of the embodiment, network redundancy design is realized, and the working reliability of the control rod position detection system can be effectively ensured.
It should be noted that the number of network interfaces is not the only one, for example, referring to fig. 6, in a more detailed embodiment, four different network interfaces may be provided in each power processing device 20, and when any one network interface fails, the power processing device 20 may still select other network interfaces according to a preset priority order, and use other types of control networks to implement output current frequency and phase adjustment of the power processing device 20.
Referring to fig. 7 in combination, in one embodiment, the encoding processing device 30 includes a voltage follower 31, a first half-wave rectifier 33, an inverting proportioner 32, a second half-wave rectifier 34, an in-phase summator 35, and an encoder 36, where the voltage follower 31 and the inverting proportioner 32 are respectively connected to the bar bit detector 10, the voltage follower 31 is connected to the first half-wave rectifier 33, the inverting proportioner 32 is connected to the second half-wave rectifier 34, the first half-wave rectifier 33 and the second half-wave rectifier 34 are respectively connected to the in-phase summator 35, the in-phase summator 35 is connected to the encoder 36, and the encoder 36 is used for outputting a position encoded signal.
Specifically, during operation of the rod position detector 10, besides the detection accuracy of the rod position detector is affected by the current interference signals of other rod position detectors 10, the measurement accuracy is not accurate enough due to the influence of the rod current of the control rod driving mechanism. In the conventional rod position measuring device, the rod position signal (i.e., the induced voltage output by the rod position detector 10) is shaped and processed to obtain the envelope of the signal in a rectifying and filtering manner, and then compared with the preset threshold voltage to obtain the corresponding position code signal. However, this method brings the moving bar interference signal into the back-end circuit, which easily causes the position code signal to jump when the bar position is near the switching point.
The scheme of the embodiment provides a novel rod position signal shaping processing mode, and a coil coding rod position detector is taken as an example for explanation. From the characteristics of the bar position signals, the bar moving process mainly causes interference to the A, B two groups of bar position signals, and the interference signals are mainly direct current. Therefore, alternating current peak value processing is carried out on the A, B two-path bar position signals. Firstly, the rod bit signals respectively enter a voltage follower 31 and an inverting operator; and then, respectively carrying out half-wave rectification, and finally, summing the two paths of signals after the half-wave rectification through an in-phase summer 35, so that the peak value of the alternating current part of the rod position signal can be basically obtained. The peak signal can eliminate most of moving rod interference, and the return difference is set in the subsequent voltage threshold comparison, so that rod position indication jump caused by moving rod current can be basically eliminated.
Referring to fig. 8 in combination, in one embodiment, the control rod position detection system further includes a first power plug-in 40 and a second power plug-in 50, each power processing device 20 is connected to the first power plug-in 40, each power processing device 20 is connected to the second power plug-in 50, each encoding processing device 30 is connected to the first power plug-in 40, each encoding processing device 30 is connected to the second power plug-in 50, and the first power plug-in 40 and the second power plug-in 50 are connected to the power source.
Specifically, in order to ensure the design of power supply redundancy, the solution of this embodiment enables the control rod position detection system to meet the performance requirements of the nuclear safety device, and provides two power plug-ins for each encoding processing device 30 and each power processing device 20, where each power plug-in can be effectively connected to an external power supply, and can perform power supply operation for both the encoding processing device 30 and the power processing device 20. Therefore, when one power supply line fails, the other power supply plug-in unit can be connected to a power supply for supplying power, so that the power supply reliability of the control rod position detection system is ensured.
In one embodiment, the first power plug-in 40 and the second power plug-in 50 may be connected to the same type of power source or may be connected to different types of power sources, so long as power redundancy control is enabled. For example, in one more detailed embodiment, it may be that the first power plug 40 is connected to an ac power source and the second power plug 50 is connected to a dc power source; alternatively, the first power plug 40 is connected to a dc power source, and the second power plug 50 is connected to an ac power source.
Further, in one embodiment, referring to fig. 8 in combination, the control rod position detection system further includes a measurement cabinet 100, and the power supply processing device 20 and the encoding processing device 30 are disposed inside the measurement cabinet 100.
Specifically, in the solution of the present embodiment, the power supply processing device 20 and the encoding processing device 30 are disposed in the same measurement cabinet 100, and the corresponding connection terminals are led out through the measurement cabinet 100, so as to implement the connection operation between the power supply processing device 20 and the encoding processing device 30 and other devices. In more detail, in one embodiment, the first power plug-in 40 and the second power plug-in 50 may be also disposed inside the measurement cabinet 100, and may be connected to an external power source through corresponding power terminals when rod position detection is required.
It should be noted that the number of measurement channels is not unique within the same measurement cabinet 100, i.e. the number of power supply processing means 20 and encoding processing means 30 is not unique. In a more detailed embodiment, three power supply processing devices 20 and three encoding processing devices 30 are simultaneously disposed in the same measuring cabinet 100, and each power supply processing device 20 and one encoding processing device 30 are correspondingly connected with a rod position detector 10, so as to realize position detection of a control rod.
Referring to fig. 9 in combination, in one embodiment, the control rod position detection system further includes a rod position processing device 90 and a digital control device 80, where each encoding processing device 30 is connected to the rod position processing device 90, and each encoding processing device 30 is connected to the digital control device 80.
Specifically, in each measuring channel, exciting current is provided for the rod position detector 10 through the power supply processing device 20, the encoding processing device 30 receives the detector signals, converts the detector signals into corresponding position encoding signals after shaping processing, and isolates and outputs two paths of signals. One path of the signals is directly input into the rod position processing device 90 for rod position calculation, step-out monitoring and fault management are performed according to the command rod position and the actual measurement rod position (namely position coding signals), and the actual measurement rod position and alarm signals are output. And the other path can be sent to other systems according to the need to execute other control logic, and the scheme of the embodiment specifically sends the position coding signal corresponding to the control rod to the digital control device 80 to participate in executing the nuclear safety function.
With continued reference to fig. 9, in one embodiment, the rod position processing device 90 includes a rod position processor 91 and a third power plug-in 92, the third power plug-in 92 is configured to be connected to an external power source, the third power plug-in 92 is connected to the rod position processor 91, and the rod position processor 91 is connected to the encoding processing device 30.
Specifically, the rod position processing device 90 includes a rod position processor 91 and a third power plug-in 92, through which an external power source can be accessed, to realize an individual power supply operation of the rod position processor 91. The rod position processor 91 performs out-of-step monitoring and fault management according to the received position code signal and in combination with a preset command signal, and outputs an actually measured rod position and an alarm signal.
Further, referring to fig. 9, in one embodiment, the control rod position detection system further includes a processing cabinet 200, and the rod position processing device 90 is disposed inside the processing cabinet 200. At this time, the position code signal obtained by real-time measurement can be transmitted to the rod position processor 91 for analysis only by leading out the corresponding wiring terminal on the outer surface of the processing cabinet, and connecting the wiring terminal with the corresponding wiring terminal on the measuring cabinet 100. Meanwhile, by connecting the external power supply to the outgoing power supply terminal, the power supply operation of the rod position processor 91 can be realized.
Still further, referring to fig. 9, in one embodiment, the control rod position detecting system further includes a rod position bottom monitor 60 and a diversified pile stopping device 70, each of the encoding processing devices 30 is connected to the rod position bottom monitor 60, and the rod position bottom monitor 60 is connected to the diversified pile stopping device 70.
Specifically, in the solution of this embodiment, the control rod position detection system further has a function of identifying whether the present rod position is at the bottom of the pile. After the encoding processing device 30 obtains the position code signal representing the control rod position information, besides the isolation output to the digital control device 80 and the rod position processing device 90, each encoding processing device 30 is also connected to the rod position pile bottom monitor 60, and the rod position pile bottom monitor 60 determines whether the control rod is at the pile bottom by comparing and analyzing the received position code signal with the corresponding preset code. After the rod position reactor bottom monitor 60 obtains the signals of 'the reactor bottom is at (or is not at) the reactor bottom' of all channels, the rod position reactor bottom monitor can judge how many control rods are at (or are not at) the reactor bottom according to preset logic and send the control rods into a diversified reactor stopping system to participate in diversified reactor stopping control.
In another embodiment, each encoding processing device 30 may have a function of identifying whether the bar is at the bottom of the pile, and each encoding processing device 30 may compare and analyze the position code signal with the preset code in the encoding processing device after obtaining the position code signal to determine whether the control bar is at the bottom of the pile. The bar position and bottom monitor 60 of all the channels of the bar position and bottom monitor is parallelly sent to the measuring cabinet, and can judge how many control bars are at the bottom (or not) according to preset logic, and send the control bars to a diversified shutdown system to participate in diversified shutdown control.
In one embodiment, to ensure even core power distribution, the control rods in the reactor are symmetrically distributed in 4 quadrants, and are grouped according to 4 bundles of control rods, and the control is performed at the same time, so that the command rod positions are the same. Referring to fig. 6 in combination, to ensure redundancy and relative independence of measured rod positions, rod position measurement channels in 4 different quadrants are respectively arranged in 4 relatively independent measurement cabinets, namely, measurement cabinet 001AR corresponds to rod position detector 10 in the first quadrant, measurement cabinet 002AR corresponds to rod position detector 10 in the second quadrant, measurement cabinet 003AR corresponds to rod position detector 10 in the third quadrant, and measurement cabinet 004AR corresponds to rod position detector 10 in the fourth quadrant.
In the control rod position detection system, each rod position detector 10, one encoding processing device 30 and one power supply processing device 20 form a measurement channel, and after receiving the power supply signals, the power supply processing device 20 performs phase processing on the power supply signals to obtain specific current signals for canceling current interference signals of other rod position detectors 10 around any one rod position detector 10, and sends the specific current signals to the corresponding rod position detector 10. Each rod position detector 10 generates an induced voltage from the corresponding current signal, and the final encoding processing device 30 processes the induced voltage to obtain a position encoded signal representing position information of the control rod. According to the scheme, under the action of the specific current signals, the current interference signals of other rod position detectors 10 around any one rod position detector 10 can be mutually offset, so that the influence of the other rod position detectors 10 around the rod position detector 10 on rod position measurement is reduced or even eliminated, and the accuracy of rod position measurement results is effectively improved.
Referring to fig. 9 to 11 in combination, a control rod position detecting apparatus includes: a rod position detector 10; the power supply processing devices 20 are respectively and correspondingly connected with the rod position detectors 10, each power supply processing device 20 is respectively used for being connected with a power supply, and the power supply processing devices 20 are used for carrying out phase processing on current signals output by the power supply and outputting the current signals to the corresponding rod position detector 10 so as to enable current interference signals of other rod position detectors 10 around any rod position detector 10 to be mutually counteracted; the coding processing devices 30 are respectively and correspondingly connected with a rod position detector 10, and are used for receiving the induction voltage obtained when the rod position detector 10 detects the position of the control rod according to the current output by the power supply processing device 20, obtaining corresponding position coding signals according to the induction voltage, and more than two measuring cabinet bodies 100, wherein more than two power supply processing devices 20 and more than two coding processing devices 30 are arranged in each measuring cabinet body 100.
Specifically, in the control rod position detection system, the rod position detector 10, the power supply processing device 20 and the coding processing device 30 are in one-to-one correspondence, that is, a rod position detection channel is formed by one rod position detector 10, one power supply processing device 20 and one coding processing device 30, so that the position detection operation of one control rod is realized. In order to avoid mutual interference between current signals input by different rod position detectors 10 and influence actual measurement accuracy when a plurality of rod position detection channels run simultaneously, according to the scheme of the application, from the angle of the current signals input by different rod position detectors 10, the current signals output by a power supply processing device 20 to each rod position detector 10 are processed, so that interference components generated by the current signals input by other rod position detectors 10 can cancel each other around any rod position detector 10, and finally, the influence of the current interference signals on the rod position detector 10 is eliminated.
The rod position detector 10 starts to detect the position of the control rod according to the current signal output by the power supply processing device 20 connected with the rod position detector 10 under the condition of no current interference, after each rod position detector 10 receives the corresponding current signal, the rod position detector generates corresponding induced voltages according to different positions of the control rod at the moment, and the encoding processing device 30 performs corresponding encoding processing after obtaining the induced voltages, so that the position information corresponding to each control rod can be finally obtained
In the solution of this embodiment, the same control rod position detecting device includes a plurality of measuring cabinets 100, and each measuring cabinet 100 has a plurality of power supply processing devices 20 and a plurality of encoding processing devices 30 disposed therein, that is, a plurality of measuring channels. Through the scheme of the embodiment, the position detection of more control rods can be realized at the same time, and the efficiency of the position detection of the control rods can be effectively improved.
In a more detailed embodiment, the front-to-back layout of the control rod position detection apparatus is shown in FIGS. 10-11. The detector power supply is the power supply processing device 20 in the above embodiment, the encoding processor is the encoding processing device 30 in the above embodiment, and the two power supplies respectively represent the first power supply plug-in 40 and the second power supply plug-in 50 in the above embodiment. The device comprises 6 measuring cabinets, wherein each measuring cabinet comprises three measuring channels, and each measuring cabinet is provided with a first power plug-in 40 and a second power plug-in 50, and the power supply redundancy design is realized. So that the control rod position sensing apparatus can accommodate 18 rod position measurement channels. Further, in one embodiment, the control rod position detection apparatus further includes a ventilator box, a stack bottom monitor 60, a button indicator light, and the like. The structure and electromagnetic compatibility of the control rod position detection equipment are specially designed, so that the reliability of the equipment is improved, and the performance requirements of nuclear safety level equipment are met.
In the control rod position detecting apparatus, each rod position detector 10, one encoding processing device 30 and one power supply processing device 20 form a measuring channel, and after receiving the power supply signals, the power supply processing device 20 performs phase processing on the power supply signals to obtain specific current signals for canceling current interference signals of other rod position detectors 10 around any one rod position detector 10, and sends the specific current signals to the corresponding rod position detector 10. Each rod position detector 10 generates an induced voltage from the corresponding current signal, and the final encoding processing device 30 processes the induced voltage to obtain a position encoded signal representing position information of the control rod. According to the scheme, under the action of the specific current signals, the current interference signals of other rod position detectors 10 around any one rod position detector 10 can be mutually offset, so that the influence of the other rod position detectors 10 around the rod position detector 10 on rod position measurement is reduced or even eliminated, and the accuracy of rod position measurement results is effectively improved.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not thereby to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (14)
- A control rod position detection system comprising:a rod position detector;the power supply processing devices are respectively and correspondingly connected with the rod position detectors, each power supply processing device is respectively used for being connected with a power supply and carrying out phase processing on current signals output by the power supply, and the power supply processing devices output the current signals subjected to the phase processing to the corresponding rod position detectors so that current interference signals of other rod position detectors around any rod position detector are mutually counteracted;the encoding processing devices are respectively and correspondingly connected with the rod position detector, the encoding processing devices receive the induced voltage obtained when the rod position detector detects the position of the control rod according to the current signal output by the power supply processing device, and the encoding processing devices obtain corresponding position encoding signals according to the induced voltage.
- The control rod position detection system according to claim 1, wherein current interference signals of other rod position detectors around any one of said rod position detectors cancel each other out, comprising:in the current signals input by other rod position detectors around any rod position detector, the number of rod position detectors inputting a first current signal is equal to that of rod position detectors inputting a second current signal, and the frequencies of the first current signal and the second current signal are equal and the phase difference is 180 degrees.
- The control rod position detection system of claim 2, wherein the phase of the first current signal is 0 degrees and the phase of the second current signal is 180 degrees.
- The control rod position detection system according to claim 1, wherein the power supply processing devices are each provided with two or more network interfaces, different network interfaces corresponding to different control network types, and the same network interfaces in the power supply processing devices are connected to each other.
- The control rod position detection system of claim 1, wherein said encoding processing means comprises a voltage follower, a first half-wave rectifier, an inverse proportioner, a second half-wave rectifier, an in-phase summer and an encoder, said voltage follower and said inverse proportioner being respectively connected to said rod position detector, said voltage follower being connected to said first half-wave rectifier, said inverse proportioner being connected to said second half-wave rectifier, said first half-wave rectifier and said second half-wave rectifier being respectively connected to said in-phase summer, said in-phase summer being connected to said encoder, said encoder being for outputting a position encoded signal.
- The control rod position detection system of claim 1, further comprising a first power plug and a second power plug, each of the power processing devices being connected to the first power plug, each of the power processing devices being connected to the second power plug, each of the encoding processing devices being connected to the first power plug, each of the encoding processing devices being connected to the second power plug, each of the first power plug and the second power plug being configured to be powered on.
- The control rod position detection system of claim 1, wherein said rod position detector is a coil-coded rod position detector, a primary coil of said coil-coded rod position detector being connected to said power processing device, and a secondary coil of said coil-coded rod position detector being connected to said coding processing device.
- The control rod position detection system of claim 1, wherein said position encoded signal is a gray code.
- The control rod position detection system according to any one of claims 1 to 8, wherein said control rod position detection system further comprises a measurement cabinet, said power supply processing means and said encoding processing means being both disposed inside said measurement cabinet.
- The control rod position detection system according to claim 1, wherein the control rod position detection system further comprises a rod position processing device and a digital control device, each of the encoding processing devices being connected to the rod position processing device, respectively, each of the encoding processing devices being connected to the digital control device, respectively.
- The control rod position detection system of claim 10, wherein said rod position processing device comprises a rod position processor and a third power plug-in for connection to an external power source, said third power plug-in being connected to said rod position processor, said rod position processor being connected to said encoding processing device.
- The control rod position detection system according to any one of claims 10 to 11, wherein said control rod position detection system further comprises a processing cabinet, said rod position processing device being disposed inside said processing cabinet.
- The control rod position detection system of claim 1, further comprising a rod position stack bottom monitor and a diversified shutdown device, each of the encoding processing devices being respectively connected to the rod position stack bottom monitor, the rod position stack bottom monitor being connected to the diversified shutdown device.
- A control rod position detection apparatus comprising:a rod position detector;the power supply processing devices are respectively and correspondingly connected with the rod position detectors, each power supply processing device is respectively used for being connected with a power supply and carrying out phase processing on current signals output by the power supply, and the power supply processing devices output the current signals subjected to the phase processing to the corresponding rod position detectors so that current interference signals of other rod position detectors around any rod position detector are mutually counteracted;the encoding processing devices are respectively and correspondingly connected with the rod position detector, the encoding processing devices receive the induced voltage obtained when the rod position detector detects the position of the control rod according to the current signal output by the power supply processing device, and the encoding processing devices obtain corresponding position encoding signals according to the induced voltage; andand more than two measuring cabinet bodies, wherein more than two power supply processing devices and more than two coding processing devices are arranged in each measuring cabinet body.
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| PCT/CN2021/107051 WO2023000130A1 (en) | 2021-07-19 | 2021-07-19 | Control rod position detection system and device |
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| CN117678034A true CN117678034A (en) | 2024-03-08 |
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| US5392321A (en) * | 1994-01-24 | 1995-02-21 | Westinghouse Electric Corporation | Method and system for magnetic coupling compensating a rod position indication system |
| JP5512182B2 (en) * | 2009-07-29 | 2014-06-04 | 株式会社四国総合研究所 | Control rod motion monitoring device and control rod motion monitoring method |
| CN101794628B (en) * | 2010-03-12 | 2012-07-25 | 清华大学 | Rod position measuring system based on error tape correction method |
| DE102012001509A1 (en) * | 2012-01-27 | 2013-08-01 | Areva Np Gmbh | Device and method for measuring the position of a displaceable control rod |
| CN102543229A (en) * | 2012-02-08 | 2012-07-04 | 上海昱章电气成套设备有限公司 | Nuclear electric rod position measurement device based on single coils and difference value measurement method of nuclear power rod position thereof |
| CN103886923B (en) * | 2013-12-04 | 2017-01-25 | 中广核研究院有限公司 | System and method for linearly measuring position of control rod |
| CN106448768B (en) * | 2016-12-12 | 2018-12-04 | 中广核工程有限公司 | Nuclear power plant's control rod rod position measuring system and measurement method |
| CN106782711B (en) * | 2016-12-27 | 2018-06-29 | 四川英杰电气股份有限公司 | Signal extraction and error filtering method and device |
| CN209029118U (en) * | 2018-11-14 | 2019-06-25 | 中国核动力研究设计院 | A kind of discrete coil grouping stick location probe of improvement type coil |
| CN112366014A (en) * | 2020-10-27 | 2021-02-12 | 中国核动力研究设计院 | Rod position measuring method, device and medium based on nuclear power station control rod motion characteristics |
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