WO2023000130A1

WO2023000130A1 - Control rod position detection system and device

Info

Publication number: WO2023000130A1
Application number: PCT/CN2021/107051
Authority: WO
Inventors: 王春生; 李涛; 许岩鲁; 张晋宝
Original assignee: 中广核研究院有限公司; 中国广核集团有限公司; 中国广核电力股份有限公司
Priority date: 2021-07-19
Filing date: 2021-07-19
Publication date: 2023-01-26
Also published as: CN117678034A

Abstract

A control rod position detection system and a device. The control rod position detection system comprises rod position detectors (10), power supply processing apparatuses (20), and coding processing apparatuses (30). Each rod position detector (10), a coding processing apparatus (30), and a power supply processing apparatus (20) form a measurement channel. The power supply processing apparatuses (20) each perform phase processing on a power supply signal after receiving the power supply signal, to obtain a specific current signal which cancels out a current interference signal of another rod position detector (10) around any rod position detector (10), and transmits the current signal to the corresponding rod position detector (10). The control rod position detection device comprises rod position detectors (10), power supply processing apparatuses (20), coding processing apparatuses (30), and two or more measurement cabinets (100). Each rod position detector (10) generates a sensing voltage according to a corresponding current signal, and finally a coding processing apparatus (30) processes the sensing voltage to obtain a position-encoding signal representing position information of a control rod.

Description

Control Rod Position Detection System and Equipment

technical field

The present application relates to the technical field of nuclear reactors, in particular to a control rod position detection system and equipment.

Background technique

Nuclear power generation is a way to generate electricity by using the heat energy released by nuclear fission in nuclear reactors. It is very similar to thermal power generation, except that nuclear reactors and steam generators are used to replace thermal power boilers, and nuclear fission energy is used to replace the chemical energy of fossil fuels. . At present, among the numerous nuclear power units, most of them use the form of nuclear power plant pressurized water reactors to generate electricity.

In the reactor of the pressurized water reactor nuclear power plant, the control rod assembly is in a high-temperature and high-pressure pressure vessel, and the chain reaction rate can be controlled to a predetermined level by lifting and lowering the control rod. Therefore, it is important to know the position of the control rod in real time. Particularly important. The rod position detector is a device that uses the principle of electromagnetic induction to detect the top position of the drive rod at the upper end of the control rod assembly, and obtains the actual position of the control rod after signal processing by the rod position measuring device. Traditional rod position detectors are generally differential transformer type, also known as coil coded rod position detectors, this type of detector has inherent defects, that is, due to the use of electromagnetic induction to generate signals, the rod position signal is easily detected by other rod positions around The excitation current of the device is disturbed, resulting in inaccurate measurement results of the final rod position.

application content

According to various embodiments of the present application, a control rod position detection system and device are provided.

A control rod position detection system, comprising: a rod position detector; a power processing device, each of the power processing devices is respectively connected to one of the rod position detectors, and each of the power processing devices is used to connect to a power source, the The power processing device is used to perform phase processing on the current signal output by the power supply, and output it to the corresponding rod position detector, so that the current interference signals of other rod position detectors around any of the rod position detectors are mutually Offset; encoding processing device, each of the encoding processing devices is respectively connected to one of the rod position detectors, and is used to receive the rod position detector when detecting the control rod position according to the current output by the power processing device. A voltage is induced, and a corresponding position encoding signal is obtained according to the induced voltage.

In the above-mentioned control rod position detection system, each rod position detector, an encoding processing device and a power processing device constitute a measurement channel. After receiving the power signal, the power processing device performs phase processing on the power signal to obtain the The current interference signals of other rod position detectors around the position detector cancel each other out and send to the corresponding rod position detectors respectively. Each rod position detector generates an induced voltage according to the corresponding current signal, and the final encoding processing device obtains a position encoding signal representing the position information of the control rod according to the received induced voltage processing. The above solution, under the action of a specific current signal, can make the current interference signals of other rod detectors around any rod detector cancel each other, thereby reducing or even eliminating the interference of other rod detectors around the rod detector. The impact of position measurement, thus effectively improving the accuracy of rod position measurement results.

A control rod position detection device, comprising a rod position detector; a power processing device, each of the power processing devices is respectively connected to a rod position detector, and each of the power processing devices is respectively used for connecting a power source and controlling the Phase processing is performed on the current signal output by the power supply, and the power processing device outputs the phase-processed current signal to the corresponding rod position detector, so that the current of other rod position detectors around any of the rod position detectors The interference signals cancel each other out; the encoding processing device, each of the encoding processing devices is respectively connected to one of the rod position detectors, and the encoding processing device receives the rod position detector and controls it according to the current signal output by the power processing device The induced voltage is obtained when the rod position is detected, and the encoding processing device obtains the corresponding position encoding signal according to the induced voltage; and more than two measuring cabinets, each of which is equipped with more than two measuring cabinets The power processing device and two or more encoding processing devices.

In the above-mentioned control rod position detection equipment, each rod position detector, an encoding processing device and a power processing device constitute a measurement channel. After receiving the power signal, the power processing device performs phase processing on the power signal to obtain the The current interference signals of other rod position detectors around the position detector cancel each other out and send to the corresponding rod position detectors respectively. Each rod position detector generates an induced voltage according to the corresponding current signal, and the final encoding processing device obtains a position encoding signal representing the position information of the control rod according to the received induced voltage processing. The above solution, under the action of a specific current signal, can make the current interference signals of other rod detectors around any rod detector cancel each other, thereby reducing or even eliminating the interference of other rod detectors around the rod detector. The impact of position measurement, thus effectively improving the accuracy of rod position measurement results.

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 present application will be apparent from the description, drawings and claims.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of a control rod position detection system in an embodiment;

Fig. 2 is a structural schematic diagram of a rod position detector in an embodiment;

Fig. 3 is a schematic diagram of the current interference waveform of the rod position detector by other rod position detectors in one embodiment;

Fig. 4 is a schematic diagram of the waveform when two different frequency signals are synthesized into a "beat wave";

Fig. 5 is a phase distribution diagram of the power supply of the top rod position detector in an embodiment;

Fig. 6 is a network connection diagram of the frequency and phase control of the power processing device in an embodiment;

FIG. 7 is a schematic structural diagram of an encoding processing device in an embodiment;

Fig. 8 is a schematic structural diagram of a control rod position detection system in another embodiment;

Fig. 9 is a schematic structural diagram of a control rod position detection system in another embodiment;

Fig. 10 is a schematic diagram of the front structure of the control rod position detection device in an embodiment;

Fig. 11 is a schematic diagram of the rear structure of the control rod position detection device in an embodiment.

detailed description

In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Preferred embodiments of the application are shown in the accompanying drawings. However, the present application can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the application more thorough and comprehensive.

Please refer to Fig. 1, a kind of control rod position detecting system, comprises: rod position detector 10; power supply and perform phase processing on the current signal output by the power supply, and the power processing device 20 outputs the phase-processed current signal to the corresponding rod position detector 10, so that other rod positions around any rod position detector 10 The current interference signals of the detectors 10 cancel each other; the encoding processing device 30, each encoding processing device 30 is respectively connected to a rod position detector 10, and the encoding processing device 30 receives the rod position detector 10 according to the current signal output by the power processing device 20. The induced voltage is obtained when the position of the control rod is detected, and the encoding processing device 30 obtains a corresponding position encoding signal according to the induced voltage.

Specifically, in a pressurized water reactor, the control rods are generally made of materials such as boron and cadmium that easily absorb neutrons. There is a set of mechanical devices outside the nuclear reaction pressure vessel to manipulate the control rods. When the control rods are fully inserted into the reaction center, they can absorb a large number of neutrons to prevent the fission chain reaction from proceeding. If the control rods are pulled out a little, the reactor will start to run, and the speed of the chain reaction will reach a certain stable value; if you want to increase the energy released by the reactor, you only need to pull out the control rods a little more, so that the absorbed neutrons will decrease, and there will be More neutrons participate in the fission reaction. To stop the chain reaction, insert the control rod fully into the nuclear reaction center to absorb most of the neutrons.

In order to monitor the position of the control rod inserted into the reaction center, it is generally necessary to perform the position detection operation of the control rod through the rod position detector 10, so that the user can control the movement of the control rod to an appropriate position according to the actual required chain reaction rate. Location. The specific type of the rod position detector 10 is not unique, as long as it can accurately reflect the position change of the control rod. For example, in a more detailed embodiment, a coil coded rod position detector can be used. At this time, the primary coil of the coil coded rod position detector is connected to the power processing device 20, and the secondary coil of the coil coded rod position detector The coil is connected to the code processing device 30 .

Specifically, please refer to Fig. 2. Coil-encoded rod position detectors generally include a set of primary coils and multi-level secondary coils. The number of secondary coils is generally five groups, respectively A, B, C, D, E , the secondary coils in each group are reversely connected in series. When the coil coded rod position detector is working, the primary coil is connected with AC power, and when the control rod driving rod moves in the coil coded rod position detector, it passes through a secondary coil in the same group, and the induced voltage on the group of coils is high, across the two secondary coils, the induced voltage is low. With the movement of the driving rod, the 5 sets of secondary coils will induce alternating high and low levels. The high and low levels are represented by "1" and "0". Rod position (control rod position).

It can be understood that the specific form of the position coding signal is not unique, and in a more detailed embodiment, the position coding signal may be Gray code. Taking the coil-coded rod position detector as an example, with the movement of the driving rod, the five groups of secondary coils will induce alternating high and low levels, and the high and low levels are represented by "1" and "0". It is a 5-digit Gray code, and different values of the Gray code represent different stick positions.

The resolution of this type of coil-encoded rod position detector is ±4 steps (15.875mm per step), and the actual rod position measurement system accuracy is ±6 steps, that is, ±95.25mm. The problems with the output signal of the coil-encoded rod position detector mainly include the following two points: one is that at the top of the reactor, when multiple coil-encoded rod-position detectors work at the same time, due to the short distance, adjacent coil-encoded rod position detectors There will be mutual interference between bit detectors. Through the actual measurement in the power station, under the rated working current, the interference signal generated by two adjacent coil-coded rod position detectors is about 2% of the actual rod position signal. If all the detectors work at the same time, the interference signal amplitude can reach the actual rod position. About 15% of the bit signal, the measured waveform is shown in Figure 3. Since the frequency of the interference signal is very close to the frequency of the rod position signal, the filter circuit cannot effectively filter it out. Near the switch point of the rod position, the interference signal often causes the rod position indication to jump. The second is that when the control rod is lifted or inserted, the current of the moving rod of the control rod drive mechanism interferes with the rod position signal, which makes the rod position signal, which is theoretically a power frequency induced voltage, shift. Due to the low frequency of the interference signal, there is still Partially remaining, when near the switch point of the stick position, the interference signal can cause the stick position indication to jump.

In the control rod position detection system provided by the present application, the rod position detector 10, the power processing device 20 and the code processing device 30 correspond to each other, that is, a rod position detector 10, a power processing device 20 and a The encoding processing device 30 jointly constitutes a rod position detection channel, and realizes a control rod position detection operation. In order to avoid mutual interference between the current signals input by different rod position detectors 10 and affect the actual measurement accuracy when multiple rod position detection channels are running simultaneously Start by performing phase processing on the current signals output from the power processing device 20 to each rod position detector 10, so that around any rod position detector 10, the interference components generated by the current signals input by other rod position detectors 10 can be cancel each other, and finally eliminate the influence of the current interference signal on the rod position detector 10 .

In the absence of current interference, the rod position detector 10 starts to detect the position of the control rod according to the current signal output by the power processing device 20 connected to it. After each rod position detector 10 receives the corresponding current signal, it will According to the different positions of the control rods at this time, corresponding induced voltages are generated, and the encoding processing device 30 performs corresponding encoding processing after obtaining the induced voltages, and finally the position information corresponding to each control rod can be obtained.

It can be understood that in order to make the current interference signals of other rod position detectors 10 around any rod position detector 10 cancel each other, the method adopted is not unique. For the sake of understanding, in one embodiment of the present application, This is achieved by inputting current signals with the same frequency and 180-degree phase difference to other rod-position detectors 10 around any rod-position detector 10 . That is to say, in one embodiment, the current interference signals of other rod position detectors 10 around any rod position detector 10 cancel each other out, including: the current input by other rod position detectors 10 around any rod position detector 10 In the signal, the number of rod position detectors 10 inputting the first current signal is equal to the number of rod position detectors 10 inputting the second current signal, the frequencies of the first current signal and the second current signal are equal, and the phases differ by 180 degrees.

Specifically, in the existing rod position measurement device, the power frequency power supply for the rod position detector 10 uses independent sinusoidal signal generators, and the frequency of different rod position detector 10 power supplies is close to the power frequency but there are differences. It is randomly determined when each power phase is powered on. The rod position signal can be written as

An interference signal can be written as

The rod position signal after superimposing a single interference signal can be written as

It can be seen from the vector synthesis method that the signal waveform after superimposing a single interference is a "beat wave" whose amplitude changes periodically with time, and the waveform is shown in Figure 4. The measured waveform of a rod position signal in a nuclear power plant (at rated operating current) superimposed with multiple interference signals is a "beat wave" with more complex amplitude changes, as shown in Figure 2. The measured rod position signal waveform is equivalent to generating ripples on the rod position signal with a constant amplitude. Because each beat frequency of the ripple is small, it is difficult to filter out by the back-end filter circuit. If the stick position is near the switching point, the ripple voltage may cross the upper and lower limits of the threshold voltage from time to time, causing the stick position indication to jump.

According to the principle of signal synthesis, if two signals have the same frequency and a phase difference of 180 degrees, then the amplitude of the superimposed signal is the difference between the two amplitudes. Therefore, in this embodiment, by controlling the power frequency and phase of the rod position detector 10, the interference signals among all the detectors on the top of the reactor can be canceled as much as possible.

The power processing device 20 of this embodiment has the function of frequency and phase processing, and can convert the input power signal into a current signal of corresponding frequency and phase through the power processing device 20. Specifically, the power signal can be phase-shifted so that the output The current signals to each rod position detector 10 have a phase difference of 180 degrees. In the same control rod position detection system, one power processing device 20 can be used to control other power processing devices 20 to output current signals with the same frequency and specific phase. In this case, each power processing device 20 needs to be connected by communication. In order to ensure that the interference signals of all rod position detectors 10 are superimposed and offset as much as possible, it is necessary to distribute the first current signal and the second current signal to the power supply current of all rod position detectors 10, and ensure that other rods around any rod position detector 10 In the input current of the bit detector 10, the quantities of the first current signal and the second current signal are equal.

It should be noted that there are many ways to distribute the phases of the current signals input by each rod position detector 10. Figure 5 discloses a scheme, the smaller circle represents the rod position detector 10 that inputs the first current signal type, and the larger circle Indicates the rod position detector 10 of the input second current signal type. This solution makes the current signals of the 4 rod position detectors 10 around each rod position detector 10, there are two first current signals and two second current signals correspondingly, so as to ensure the detection of the surrounding four rod positions. The current of the detector 10 to the rod position detector 10 and the interference signal cancel each other out, and the influence is zero.

Further, because there are less than 4 rod detectors 10 adjacent to the rod detector 10 in the outermost layer, it is only necessary to ensure that the input of the rod detectors 10 around it is a single current signal of the first current signal. The number may be equal to the number of the input as the second current signal. Through the above frequency and phase control of the power supplies of different rod position detectors 10, the interference caused by the mutual influence of the rod position detectors 10 can be reduced to below 30% of the original interference. At individual detectors, because the number of the first current signal and the second current signal are almost equal and the distances are symmetrical, this type of interference signal can be reduced to close to zero. Then, the hysteresis is set by the subsequent voltage threshold comparison circuit, which can basically eliminate the jump of the rod position indication caused by the mutual influence of the rod position detectors 10 .

It can be understood that the specific phase angle of the first current signal and the second current signal is not unique, as long as the frequency of the two is equal and the phase difference is 180 degrees. 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, setting the phases of the first current signal and the second current signal to 0 degrees and 180 degrees respectively has the advantages of simple control and easy implementation.

In one embodiment, each power processing device 20 is provided with more than two network interfaces, and different network interfaces correspond to different control network types, and the same network interfaces in each power processing device 20 are connected to each other.

Specifically, in the solution of this embodiment, in order to realize the communication of each power processing device 20 , one of the power processing devices 20 can realize the output current frequency and phase adjustment operation of other power processing devices 20 . Through the solution of this embodiment, a variety of different network interfaces are set and connected to different networks respectively, so that when any network interface fails, the power processing device 20 can still select other network interfaces according to the preset priority order. The network interface utilizes other types of control networks to realize frequency and phase adjustment of the output current of the power processing device 20 . Through the solution of this embodiment, the network redundancy design is realized, which can effectively ensure the working reliability of the control rod position detection system.

It should be noted that the number of network interfaces is not unique. For example, please refer to FIG. When the network interface fails, the power processing device 20 can still select other network interfaces according to the preset priority order, and use other types of control networks to adjust the output current frequency and phase of the power processing device 20 .

Please refer to Fig. 7 in conjunction with, in one embodiment, code processing device 30 comprises voltage follower 31, first half-wave rectifier 33, reverse scaler 32, second half-wave rectifier 34, non-inverting summer 35 and encoder 36, the voltage follower 31 and the reverse proportional device 32 are respectively connected to the rod position detector 10, the voltage follower 31 is connected to the first half-wave rectifier 33, the reverse proportional device 32 is connected to the second half-wave rectifier 34, and the first half-wave rectifier 33 and the second half-wave rectifier 34 are respectively connected to a non-inverting summer 35, and the non-inverting summer 35 is connected to an encoder 36, and the encoder 36 is used to output a position encoding signal.

Specifically, during the operation of the rod position detector 10, in addition to being affected by current interference signals from other rod position detectors 10, its detection accuracy is also affected by the moving rod current of the control rod drive mechanism, resulting in inaccurate measurement accuracy. In the traditional rod position measuring device, the shaping process of the rod position signal (that is, the induced voltage output by the rod position detector 10) is mostly obtained by rectification and filtering to obtain the envelope of the signal, and then compared with the preset threshold voltage to obtain the corresponding Position coded signal. However, this method will bring the interference signal of the moving rod into the back-end circuit, which will easily cause the position encoding signal to jump near the switching point of the rod position.

The solution of this embodiment provides a new type of rod position signal shaping and processing method, which is explained by taking a coil-coded rod position detector as an example. It can be seen from the characteristics of the rod position signal that the process of moving the rod mainly causes interference to the A and B groups of rod position signals, and the interference signal is mainly DC. For this reason, the AC peak value processing is performed on the A and B two-way rod position signals. First, the rod position signal enters the voltage follower 31 and the inverting operator respectively; then half-wave rectification is performed respectively, and finally the two-way signals after half-wave rectification are summed through the non-inverting summer 35, and the rod position signal can basically be obtained peak value of the AC portion. The peak signal can eliminate most of the moving rod interference, and then set the hysteresis when comparing the subsequent voltage thresholds, which can basically eliminate the rod position indication jump caused by the moving rod current.

Please refer to FIG. 8 , 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 respectively connected to the first power plug-in 40, and each power processing device 20 is respectively Connect the second power plug 50, each encoding processing device 30 is connected to the first power plug 40, each encoding processing device 30 is respectively connected to the second power plug 50, the first power plug 40 and the second power plug 50 are respectively connected to the power supply.

Specifically, in the solution of this embodiment, in order to ensure the design of power supply redundancy, so that the control rod position detection system can meet the performance requirements of nuclear safety equipment, two power plug-ins are provided for each encoding processing device 30 and each power processing device 20, Each power plug-in can be effectively connected to an external power supply, and can provide power for the encoding processing device 30 and the power processing device 20 . Therefore, when one of the power supply lines fails, another power plug-in can be connected to the power supply for power supply, thereby ensuring the power supply reliability of the control rod position detection system.

In one embodiment, the first power plug 40 and the second power plug 50 may be connected to the same type of power supply, or may be connected to different types of power supply, as long as power supply redundancy control can be realized. For example, in a more detailed embodiment, the first power plug 40 may be connected to an AC power supply, and the second power plug 50 may be connected to a DC power supply; or the first power plug 40 may be connected to a DC power supply, and the second power plug 50 may be connected to an AC power supply. .

Further, in an embodiment, please refer to FIG. 8 , the control rod position detection system further includes a measurement cabinet 100 , and the power processing device 20 and the code processing device 30 are both arranged inside the measurement cabinet 100 .

Specifically, in the solution of this embodiment, the power processing device 20 and the coding processing device 30 are arranged inside the same measurement cabinet 100, and the corresponding connection terminals are drawn out through the measurement cabinet 100 to realize the power processing device 20 and the coding processing device 30 respectively. Both devices 30 operate in connection with other devices. In more detail, in one embodiment, the first power plug-in 40 and the second power plug-in 50 can also be arranged inside the measuring cabinet 100, and when rod position detection is required, the corresponding power terminals communicate with the outside Just connect the power supply.

It should be noted that, inside the same measurement cabinet 100 , the number of measurement channels is not unique, that is, the number of power processing devices 20 and code processing devices 30 is not unique. In a more detailed embodiment, inside the same measurement cabinet 100, three power processing devices 20 and three encoding processing devices 30 are simultaneously arranged, and each power processing device 20 and one encoding processing device 30 are correspondingly connected to one The rod position detector 10 can realize the position detection of a control rod.

Please refer to Fig. 9 in combination, in one embodiment, the control rod position detection system also includes a rod position processing device 90 and a digital control device 80, and each encoding processing device 30 is connected to the rod position processing device 90 respectively, and each encoding processing device 30 is connected to the rod position processing device 90 respectively. Digital control device 80.

Specifically, in each measurement channel, the power processing device 20 provides excitation current for the rod position detector 10, and the code processing device 30 receives the detector signal, transforms it into a corresponding position code signal after shaping, and outputs two isolated signals. road signal. One of them is directly input to the rod position processing device 90 to calculate the rod position, perform out-of-step monitoring and fault management according to the command rod position and the measured rod position (that is, the position code signal), and output the measured rod position and alarm signal. The other channel can be sent to other systems as needed to execute other control logics. The solution of this embodiment is specifically to send the position code signals corresponding to the control rods to the digital control device 80 to participate in the execution of nuclear safety functions.

Please continue to refer to FIG. 9 , in one embodiment, the stick position processing device 90 includes a stick position processor 91 and a third power plug 92, the third power plug 92 is used to connect to an external power supply, and the third power plug 92 is connected to the stick position processing Device 91, stick bit processor 91 is connected to encoding processing device 30.

Specifically, the stick position processing device 90 includes a stick position processor 91 and a third power plug 92, through which an external power supply can be connected to realize the independent power supply operation of the stick position processor 91. The rod position processor 91 performs out-of-step monitoring and fault management according to the received position coded signal and combined with the preset command signal, and outputs the measured rod position and an alarm signal.

Further, please continue to refer 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 . Now only need to lead out corresponding connection terminal on the appearance of processing cabinet, this connection terminal is connected with the corresponding connection terminal on the measurement cabinet body 100, the position coding signal that real-time measurement obtains can be delivered to rod position processor 91 and analyze. At the same time, by leading out the power supply terminal and connecting to an external power supply, the power supply operation for the stick position processor 91 can be realized.

Further, please continue to refer to Fig. 9. In one embodiment, the control rod position detection system further includes a rod position stack bottom monitor 60 and a variety of shutdown devices 70, and each coding processing device 30 is connected to the rod position stack bottom monitor respectively. The monitor 60 and the rod position stack bottom monitor 60 are connected to the diversified shutdown device 70.

Specifically, in the solution of this embodiment, the control rod position detection system also has the identification function of "whether the rod position is at the bottom of the pile". After the code processing device 30 obtains the position code signal representing the position information of the control rods, in addition to isolated output to the digital control device 80 and the rod position processing device 90, each code processing device 30 is also connected to the rod position stack bottom monitor 60 The rod position monitor 60 at the bottom of the pile judges whether the control rods are at the bottom of the pile by comparing and analyzing the received position code signal with the corresponding preset code. The rod position monitor 60 at the bottom of the pile can judge how many control rods are at the bottom of the pile (or not) according to the preset logic after receiving the signals of "rods are at (or not at) the bottom of the pile" from all channels, and send them to the diversified stop. Reactor system, participate in diversified shutdown control.

In another embodiment, each code processing device 30 itself can also have the identification function of "whether the rod position is at the bottom of the pile". After each code processing device 30 obtains the position code signal, it compares it with its internal preset code. Analyze to determine whether the control rod is at the bottom of the pile. The "rods are at (or not at) the pile bottom" signals of all channels are sent in parallel to the rod position pile bottom monitor 60 in the measuring cabinet, which can judge how many control rods are at (or not at) the pile bottom according to the preset logic, and send them to Enter the diversified shutdown system and participate in the diversified shutdown control.

In one embodiment, in order to ensure uniform power distribution of the core, the control rods in the reactor are symmetrically distributed in four quadrants, and four bundles of control rods are controlled simultaneously as a group, and the position of the command rods is the same. Please refer to Figure 6. In order to ensure the redundancy and relative independence of the measured rod position, the rod position measurement channels in 4 different quadrants are respectively arranged in 4 relatively independent measurement cabinets, that is, the measurement cabinet 001AR corresponds to the first quadrant The rod position detector 10 in the measurement cabinet 002AR corresponds to the rod position detector 10 in the second quadrant, the measurement cabinet 003AR corresponds to the rod position detector 10 in the third quadrant, and the measurement cabinet 004AR corresponds to the rod position detector in the fourth quadrant 10.

In the control rod position detection system described above, each rod position detector 10, an encoding processing device 30 and a power processing device 20 form a measurement channel, and the power processing device 20 performs phase processing on the power signal after receiving the power signal to obtain Specific current signals that cancel out the current interference signals of other rod position detectors 10 around any rod position detector 10 are sent to the corresponding rod position detectors 10 respectively. Each rod position detector 10 generates an induced voltage according to the corresponding current signal, and finally the encoding processing device 30 processes the received induced voltage to obtain a position encoding signal representing the position information of the control rod. The above solution, under the action of a specific current signal, can make the current interference signals of other rod position detectors 10 around any rod position detector 10 cancel each other, thereby reducing or even eliminating the detection of other rod position detectors around the rod position detector 10. The impact of the device 10 on the rod position measurement, thereby effectively improving the accuracy of the rod position measurement results.

Please refer to Fig. 9-Fig. 11 in conjunction with Fig. 9, a kind of control rod position detection equipment, comprising: rod position detector 10; They are respectively used to connect the power supply, and the power processing device 20 is used to perform phase processing on the current signal output by the power supply, and output it to the corresponding rod position detector 10, so that the other rod position detectors 10 around any rod position detector 10 The current interference signals cancel each other out; the encoding processing device 30, each encoding processing device 30 is respectively connected to a rod position detector 10, and is used for receiving the rod position detector 10 to detect the position of the control rod according to the current output by the power processing device 20. The induced voltage, and the corresponding position encoding signal is obtained according to the induced voltage, and more than two measuring cabinets 100, each measuring cabinet 100 is equipped with more than two power processing devices 20 and more than two encoding processing devices 30.

Specifically, in the control rod position detection system, the rod position detector 10, the power processing device 20, and the encoding processing device 30 correspond one-to-one, that is, a rod position detector 10, a power processing device 20, and an encoding processing The devices 30 together constitute a rod position detection channel to realize a control rod position detection operation. In order to avoid mutual interference between the current signals input by different rod position detectors 10 and affect the actual measurement accuracy when multiple rod position detection channels are running simultaneously Start by processing the current signals output from the power processing device 20 to each rod position detector 10, so that around any rod position detector 10, the interference components generated by the current signals input by other rod position detectors 10 can interact with each other. Offset, and finally eliminate the impact of the current interference signal on the rod position detector 10 .

In the absence of current interference, the rod position detector 10 starts to detect the position of the control rod according to the current signal output by the power processing device 20 connected to it. After each rod position detector 10 receives the corresponding current signal, it will According to the different positions of the control rods at this time, corresponding induced voltages are generated, and the encoding processing device 30 performs corresponding encoding processing after obtaining the induced voltages, and finally the position information corresponding to each control rod can be obtained

In the solution of this embodiment, the same control rod position detection device includes a plurality of measuring cabinets 100, and each measuring cabinet 100 is equipped with a plurality of power processing devices 20 and a plurality of coding processing devices 30 correspondingly, that is, it has a plurality of Measurement passed. Through the solution of this embodiment, position detection of more control rods can be realized at the same time, and the efficiency of position detection of control rods can be effectively improved.

In a more detailed embodiment, the front and rear layouts of the control rod position detection equipment are shown in Figures 10-11. The detector power supply is the power processing device 20 in the above embodiment, the encoding processor is the encoding processing device 30 in the above embodiment, and the two low-voltage power supplies respectively represent the first power plug-in 40 and the second power supply in the above embodiment Plugin 50. The device includes six measurement cabinets, each of which includes three measurement channels, and each measurement cabinet implements a redundant power supply design, and is equipped with a first power plug 40 and a second power plug 50 . Therefore, the control rod position detection device can accommodate 18 rod position measurement channels. Further, in one embodiment, the control rod position detection equipment also includes a ventilated cabinet, a pile bottom monitor 60, button indicator lights and the like. The structure and electromagnetic compatibility of the above-mentioned control rod position detection equipment are specially designed, which improves the reliability of the equipment and meets the performance requirements of nuclear safety equipment.

In the above-mentioned control rod position detection equipment, each rod position detector 10, an encoding processing device 30 and a power processing device 20 form a measurement channel, and the power processing device 20 performs phase processing on the power signal after receiving the power signal to obtain Specific current signals that cancel out the current interference signals of other rod position detectors 10 around any rod position detector 10 are sent to the corresponding rod position detectors 10 respectively. Each rod position detector 10 generates an induced voltage according to the corresponding current signal, and finally the encoding processing device 30 processes the received induced voltage to obtain a position encoding signal representing the position information of the control rod. The above solution, under the action of a specific current signal, can make the current interference signals of other rod position detectors 10 around any rod position detector 10 cancel each other, thereby reducing or even eliminating the detection of other rod position detectors around the rod position detector 10. The impact of the device 10 on the rod position measurement, thereby effectively improving the accuracy of the rod position measurement results.

The technical features of the above embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be It is considered to be within the range described in this specification.

The above examples only express several implementation modes of the present application, and the description thereof is relatively specific and detailed, but should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of protection of the patent application should be based on the appended claims.

Claims

A control rod position detection system comprising:

Rod position detector;

A power processing device, each of the power processing devices is connected to one of the rod position detectors, and each of the power processing devices is respectively used to connect to a power source and perform phase processing on the current signal output by the power source, and the power processing device Outputting the phase-processed current signal to the corresponding rod position detector, so that the current interference signals of other rod position detectors around any of the rod position detectors cancel each other;

An encoding processing device, each of the encoding processing devices is respectively connected to one of the rod position detectors, and the encoding processing device receives the rod position detector and detects the position of the control rod according to the current signal output by the power processing device. An induced voltage, the encoding processing device obtains a corresponding position encoding signal according to the induced voltage.
The control rod position detection system according to claim 1, wherein the current interference signals of other rod position detectors around any one of the rod position detectors cancel each other out, including:

Among the current signals input by other rod position detectors around any one of the rod position detectors, the number of rod position detectors inputting the first current signal is equal to the number of rod position detectors inputting the second current signal, and the first The frequency of the current signal and the second current signal are equal, and the phases differ by 180 degrees.
The control rod position detection system according to 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 each of the power processing devices is provided with more than two network interfaces, and different network interfaces correspond to different control network types, and the same network in each of the power processing devices The interfaces are connected to each other.
The control rod position detection system according to claim 1, wherein the code processing device comprises a voltage follower, a first half-wave rectifier, an inverse proportional device, a second half-wave rectifier, a non-inverting summer, and an encoder, The voltage follower and the inverse proportioner are respectively connected to the rod position detector, the voltage follower is connected to the first half-wave rectifier, and the inverse proportioner is connected to the second half-wave rectifier, The first half-wave rectifier and the second half-wave rectifier are respectively connected to the non-inverting summer, the non-inverting summer is connected to the encoder, and the encoder is used to output a position encoding signal.
The control rod position detection system according to claim 1, wherein the control rod position detection system further comprises a first power plug-in and a second power plug-in, each of the power processing devices is respectively connected to the first power plug-in, each The power processing device is respectively connected to the second power plug-in, each of the encoding processing devices is respectively connected to the first power plug-in, each of the encoding processing devices is respectively connected to the second power plug-in, and the first power plug-in and the second power plug are respectively used to access power.
The control rod position detection system according to claim 1, wherein the rod position detector is a coil coded rod position detector, the primary coil of the coil coded rod position detector is connected to the power processing device, so The secondary coil of the coil-encoded rod position detector is connected to the encoding processing device.
The control rod position detection system according to claim 1, wherein the position code signal is Gray code.
The control rod position detection system according to any one of claims 1-8, wherein the control rod position detection system further includes a measurement cabinet, and the power processing device and the code processing device are both arranged in the measurement The interior of the 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 code processing devices is respectively connected to the rod position processing device, each The encoding processing device is respectively connected to the digital control device.
The control rod position detection system according to claim 10, wherein the rod position processing device comprises a rod position processor and a third power plug-in, the third power plug-in is used to connect to an external power supply, and the third power plug-in The stick position processor is connected, and the stick position processor is connected to the encoding processing device.
The control rod position detection system according to any one of claims 10-11, wherein the control rod position detection system further comprises a processing cabinet, and the rod position processing device is arranged inside the processing cabinet.
The control rod position detection system according to claim 1, wherein the control rod position detection system further includes a rod position stack bottom monitor and a variety of shutdown devices, each of the code processing devices is connected to the rod position stack Bottom monitor, the rod position stack bottom monitor is connected to the diversified shutdown device.
A control rod position detection device, comprising:

Rod position detector;

A power processing device, each of the power processing devices is connected to one of the rod position detectors, and each of the power processing devices is respectively used to connect to a power source and perform phase processing on the current signal output by the power source, and the power processing device Outputting the phase-processed current signal to the corresponding rod position detector, so that the current interference signals of other rod position detectors around any of the rod position detectors cancel each other;

An encoding processing device, each of the encoding processing devices is respectively connected to one of the rod position detectors, and the encoding processing device receives the rod position detector and detects the position of the control rod according to the current signal output by the power processing device. an induced voltage, the encoding processing device obtains a corresponding position encoding signal according to the induced voltage; and

There are more than two measuring cabinets, each of which is provided with more than two power processing devices and two or more encoding processing devices.