CN114326493B - Nuclear power plant signal channel switching control circuit and control device - Google Patents
Nuclear power plant signal channel switching control circuit and control device Download PDFInfo
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Abstract
The invention belongs to the technical field of nuclear power plant equipment management, and provides a nuclear power plant signal channel switching control circuit and a control device.
Description
Technical Field
The invention belongs to the technical field of nuclear power plant equipment management, and particularly relates to a nuclear power plant signal channel switching control circuit and a control device.
Background
In the control system of the nuclear power plant, most of the technical equipment in the 70 th century is adopted, and the control system mainly comprises equipment such as a simulation plate, a relay, a traditional manual operator of a main control room, a change-over switch, a hard light character plate and the like.
For example, the measurement channels of important control loops such as evaporator liquid level control, main water supply control, main steam control and the like are switched by adopting a hard change-over switch, the hard change-over switch is provided with a plurality of selection gears, and when different gears are selected, the measurement channels output corresponding signals to the control loops for automatic control.
In specific operation, an operator adopts a manual switching method after finding out that a measurement channel is faulty or a measured value is unreliable to switch equipment from automatic control to manual control, so that the control function of the lower-level controlled equipment is ensured to be available.
Disclosure of Invention
The invention aims to provide a nuclear power plant signal channel switching control circuit, which aims to solve the problem of low effective reliability of traditional equipment control.
A first aspect of an embodiment of the present invention provides a signal path switching control circuit of a nuclear power plant, including:
The redundant m paths of signal channels are used for respectively outputting control signals to the nuclear power plant control equipment so as to redundantly control the nuclear power plant control equipment to work in an automatic mode;
The manual change-over switch is provided with m+1 gears, and comprises a first neutral gear and m first channel selection gears which are arranged in one-to-one correspondence with m signal channels;
the manual change-over switch outputs no channel selection signal when switching to the first neutral gear, and triggers and outputs a corresponding first channel selection signal when switching to one of the first channel selection gears;
The control circuit is used for acquiring control signals of all the signal channels, cutting off the corresponding signal channel when detecting that the control signals of one signal channel exceed a preset signal threshold value, and outputting a manual control signal to nuclear power plant control equipment when detecting that the control signals of n signal channels exceed the preset signal threshold value so as to enable the nuclear power plant control equipment to switch to a manual mode, wherein m > n is more than or equal to 2;
And triggering and selecting the corresponding signal channel to output the control signal when receiving the corresponding first channel selection signal, and cutting off the rest signal channels.
In one embodiment, the nuclear power plant signal path switching control circuit further includes:
The test change-over switch is connected with the control circuit and is provided with m+1 gears, and comprises a second neutral gear and m second channel selection gears which are arranged in one-to-one correspondence with m signal channels;
the test change-over switch is used for triggering and outputting a corresponding second channel selection signal when switching to one of the second channel selection gears;
The control circuit is further configured to cut off the corresponding signal channel when the second channel selection signal is received.
In one embodiment, the nuclear power plant signal channel switching control circuit further comprises a first indication circuit and a second indication circuit;
The first indicating circuit and the second indicating circuit are respectively connected with the control circuit;
The control circuit cuts off the corresponding signal channel when detecting that the control signal of one signal channel exceeds a preset signal threshold value, and controls the first indication circuit to send out indication alarm information;
and outputting a manual control signal to the nuclear power plant control equipment when detecting that the control signals of the n paths of signal channels exceed a preset signal threshold value, so that the nuclear power plant control equipment is switched to a manual mode, and controlling the second indicating circuit to send out indication alarm information.
In one embodiment, the control circuit is further configured to:
and when the manual change-over switch and the test change-over switch are switched to the channel selection gear corresponding to the same signal channel, triggering and outputting a manual control signal to the nuclear power plant control equipment so as to enable the nuclear power plant control equipment to be switched to a manual mode.
In one embodiment, the circuit includes a logic gate circuit and a controller;
The controller is respectively connected with the signal ends of the m first channel selection gears of the manual change-over switch, the signal ends of the m second channel selection gears of the test change-over switch, the m signal channels and the output end of the logic gate circuit, and the input end of the logic gate circuit is respectively connected with the signal ends of the m first channel selection gears of the manual change-over switch and the signal ends of the m second channel selection gears of the test change-over switch;
The logic gate circuit is used for outputting a mode switching signal to the controller when the manual switch and the test switch are switched to the channel selection gear corresponding to the same signal channel;
The controller is used for triggering and outputting a manual control signal to the nuclear power plant control equipment when receiving the mode switching signal so as to enable the nuclear power plant control equipment to be switched to a manual mode.
In one embodiment, the logic gate circuit comprises m AND gates and a plurality of OR gates;
The first channel selection gear and the second channel selection gear corresponding to the same signal channel are connected with one AND gate, and the output end of each AND gate is correspondingly connected with a plurality of OR gates.
In one embodiment, the nuclear power plant signal channel switching control circuit further comprises a display module for displaying the parameter size of the control signal, and the display module is connected with the control circuit.
In one embodiment, m is equal to 3 and n is equal to 2.
In one embodiment, the manual change-over switch comprises a hard change-over switch, the hard change-over switch comprises a knob and a gear panel arranged corresponding to the knob, and the gear panel comprises m+1 gears, including a first neutral gear and m first channel selection gears arranged in one-to-one correspondence with m signal channels.
A second aspect of an embodiment of the present invention provides a nuclear power plant signal path switching control device, including a nuclear power plant signal path switching control circuit as described above.
Compared with the prior art, the embodiment of the invention has the beneficial effects that: according to the nuclear power plant signal channel switching control circuit, automatic selection control is realized by adding the redundant signal channels and the control circuit, when the signal channels all output control signals, the control circuit detects multiple paths of control signals, automatically cuts off one path of signals when detecting that the control signals of one path of signal channels exceed a preset signal threshold value, and controls nuclear power plant control equipment to switch to a manual mode when detecting that a plurality of paths of control signals exceed the preset signal threshold value, so that the operation dependence on operators is reduced, the delay time in the switching process is shortened, the switching reliability is improved, the number of key sensitive equipment is effectively reduced, the reliability of control functions is improved, and the automation level of a power station is improved.
Drawings
Fig. 1 is a schematic diagram of a first structure of a signal channel switching control circuit of a nuclear power plant according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a second structure of a signal channel switching control circuit of a nuclear power plant according to an embodiment of the present invention;
Fig. 3 is a schematic diagram of a third structure of a signal channel switching control circuit of a nuclear power plant according to an embodiment of the present invention;
Fig. 4 is a schematic diagram of a fourth structure of a signal channel switching control circuit of a nuclear power plant according to an embodiment of the present invention;
Fig. 5 is a schematic diagram of a fifth configuration of a signal path switching control circuit of a nuclear power plant according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, "m" means two or more unless specifically defined otherwise.
A first aspect of an embodiment of the present invention proposes a signal path switching control circuit 100 for a nuclear power plant.
As shown in fig. 1, in the present embodiment, a nuclear power plant signal path switching control circuit 100 includes:
The m signal channels L1-Lm are arranged in a redundancy way and are used for respectively outputting control signals to the nuclear power plant control equipment 200 so as to control the nuclear power plant control equipment 200 to work in an automatic mode in a redundancy way;
The manual change-over switch 10 is provided with m+1 gears, and comprises a first neutral gear N1 and m first channel selection gears A1-Am which are arranged in one-to-one correspondence with m signal channels;
a manual change-over switch 10 which outputs no channel selection signal when switching to the first neutral gear N1 and triggers the output of a corresponding first channel selection signal when switching to one of the first channel selection gears;
the control circuit 20 is correspondingly connected with the m signal channels and the manual change-over switch 10, the control circuit 20 is used for acquiring control signals of all the signal channels, cutting off the corresponding signal channel when detecting that the control signals of one signal channel exceed a preset signal threshold value, and outputting a manual control signal to the nuclear power plant control equipment 200 when detecting that the control signals of the n signal channels all exceed the preset signal threshold value, so that the nuclear power plant control equipment 200 is switched to a manual mode, wherein m > n is more than or equal to 2;
And triggering and selecting the corresponding signal channel to output a control signal when receiving a corresponding first channel selection signal, and cutting off the remaining signal channels.
In this embodiment, the control signals set in redundancy are output to the control device 200 of the nuclear power plant through the signal line to perform redundant automatic control, so that the corresponding control device 200 of the nuclear power plant can be ensured to operate reliably, the control device 200 of the nuclear power plant can be an evaporator liquid level control device, a main water supply control device, a main steam control device, etc., and the control device 200 of the nuclear power plant can also be manually operated by an operator, that is, the control device 200 of the nuclear power plant has a manual mode and an automatic mode, and is correspondingly switched according to the state of the control signal of the signal channel.
In a normal steady running state, an operator switches the manual switch 10 to the first neutral gear N1, at this time, all signal channels are put into participation control, the control device 200 of the nuclear power plant may select one of the signal channels as a final control signal, the remaining control signals as standby control signals, and the averaged control signals of the control signals may also be used as final control signals, and the signal selection mode of the control device 200 of the nuclear power plant is not limited, and when one or more signal channels fail, the remaining control signals may still realize automatic control.
The control circuit 20 monitors the control signals of the signals of each channel, sets corresponding preset signal thresholds, compares the values of the average value, the next maximum value and the like with the preset signal thresholds according to the sizes of the signals, and when an abnormal state occurs in a certain channel, such as a signal line disconnection or an over-range upper and lower line problem and the like, and causes the abnormal state to exceed the preset signal thresholds, the control circuit 20 automatically cuts off the channel, cuts off the channel of the control signal to participate in control, and the remaining control signal participates in control, wherein the remaining m-1 channel of the control signal is still in a redundant signal mode, so that the nuclear power plant control equipment 200 can still ensure that the redundant control signal is acquired to realize reliable automatic operation.
When it is detected that the magnitude of two or more control signals exceeds the preset signal threshold, the remaining signal channels may be one, that is, when the control signal currently received by the control device 200 of the nuclear power plant is one, for example, the remaining signal channels are damaged again, there is a problem of switching delay, in order to improve the reliable operation of the control device 200 of the nuclear power plant, the control circuit 20 directly or indirectly controls the control device 200 of the nuclear power plant through an actuating mechanism to switch the manual mode, and the operator performs the manual operation, and at this time, the control circuit 20 may inform the operator of the current automatic and manual switching state through the corresponding display module and the indication module before switching the manual mode, so as to perform the subsequent manual operation.
Meanwhile, the manual switch 10 can also select one of the signal channels according to the operation of the operator, and when the manual switch 10 selects to a corresponding one of the first channels to select a gear, the control circuit 20 selects the corresponding signal channel to participate in automatic control.
The signal channels and the setting mode of the control circuit 20 may be set correspondingly, for example, a control signal of the signal channel is output from a signal source, and is output to the control device 200 of the nuclear power plant through the control circuit 20, when the manual switch 10 is switched to the first neutral gear N1, the control circuit 20 performs signal monitoring operation, when a corresponding path of control signal is monitored, the output of the path of control signal is cut off through an internal switch or the like, so as to realize channel signal selection operation, and when the manual switch 10 is switched to a corresponding first channel selection gear, the control circuit 20 switches on the corresponding signal channel through the internal switch, cuts off the remaining signal channels, so as to realize selection of a single path of signal channel.
Or the control signal of the signal channel is output by the signal source, the switch circuit is in controlled connection with the control circuit 20 through the switch circuit, when the manual switch 10 is switched to the first neutral gear N1, the control circuit 20 executes signal monitoring work, when one path of control signal is monitored, the control circuit is controlled to be correspondingly switched on or off, so that the output of the path of control signal is cut off, channel signal selection work is realized, when the manual switch 10 is switched to one first channel selection gear, the control circuit 20 controls the switch circuit to be correspondingly switched on or off, so that the corresponding signal channel is conducted, the rest signal channels are cut off, and the selection of a single path of signal channel is realized.
Or the control signals of the signal channels are output by the control circuit 20, the control signals correspondingly output multiple paths or one path of control signals according to the switching gear of the manual switching switch 10, meanwhile, the magnitude of each path of control signals is monitored, and when the signal lines between the control signals and the nuclear power plant control equipment 200 are disconnected or the control signals are out of range, the control circuit 20 cuts off the control signals of the corresponding signal channels.
In this embodiment, automatic selection control is implemented by adding redundant signal channels and the control circuit 20, when the signal channels all output control signals, the control circuit 20 detects multiple paths of control signals, automatically cuts off one path of signals when detecting that the control signal of one path of signal channel exceeds a preset signal threshold, and controls the nuclear power plant control equipment 200 to switch to a manual mode when detecting that a plurality of paths of control signals exceed the preset signal threshold, so as to reduce operation dependence on operators, shorten delay time in the switching process, improve switching reliability, effectively reduce the number of key sensitive equipment (single fault machine-skip pile-skipping equipment) caused by untimely intervention or intervention errors of operators, improve control function reliability, and improve automation level of a power station.
Meanwhile, the corresponding channel selection control can be performed through the manual switch 10, so that the selection control is realized, and the working diversity is improved.
The manual switch 10 may be a push button switch, a knob switch, or the like, so as to maintain the original operation habit of the operator and optimize the matching control function, alternatively, as shown in fig. 1, the manual switch 10 includes a hard switch, and the hard switch includes a knob and a gear panel corresponding to the knob, where the gear panel includes m+1 gears, including a first neutral gear N1 and m first channel selection gears A1-Am corresponding to m signal channels, so as to implement transformation of the master switch, increase a gear switching position and a neutral gear, and in a normal steady operation state, the operator selects the knob in the first neutral gear N1, and the control circuit 20 obtains the control signals of each control signal, and when selecting other first channel selection gears, the corresponding signal channels are selected and participate in control.
The control circuit 20 may employ a corresponding control unit and peripheral auxiliary circuits, and may include, for example, a controller U1, and an actuator connected to the controller U1 and the nuclear power plant control apparatus 200, respectively, and the specific mechanism is not limited.
Meanwhile, the number of signal channels that are set in a redundant manner may be set correspondingly, in order to simplify the circuit structure, in one embodiment, the number of signal channels that are set in a redundant manner is 3, and when detecting that the control signal of one signal channel exceeds the preset signal threshold, the control circuit 20 cuts off the signal channel, and when detecting that the control signals of both signal channels exceed the preset signal threshold, the control device 200 of the nuclear power plant is controlled to switch to the manual mode.
As shown in FIG. 2, to perform periodic tests in conjunction with plant performance of the signal path, in one embodiment, the nuclear plant signal path switching control circuit 100 further includes:
The test change-over switch 30 is connected with the control circuit 20, and the test change-over switch 30 is provided with m+1 gears, including a second neutral gear N2 and m second channel selection gears B1-Bm which are arranged in one-to-one correspondence with m signal channels;
the test change-over switch 30 is used for triggering and outputting a corresponding second channel selection signal when switching to one of the second channel selection gears;
the control circuit 20 is further configured to cut off the corresponding signal channel when the second channel selection signal is received.
In the present embodiment, the state of the control signal finally output to the nuclear power plant control apparatus 200 includes various cases according to the gear selection manner of the manual change-over switch 10 and the trial change-over switch 30.
When the manual selector switch 10 selects the first neutral gear N1 and the test selector switch 30 selects the second neutral gear N2, the redundant m control signals are output to the nuclear power plant control device 200 through the m signal paths L1 to Lm, and redundant automatic control is performed.
When the manual selector switch 10 selects one of the first channel selection gear positions and the test selector switch 30 selects the second neutral gear position N2, a control signal corresponding to the first channel selection gear position is output to the nuclear power plant control apparatus 200 through a corresponding signal channel, so that automatic control of the single-channel signal is realized.
When the manual changeover switch 10 selects the first neutral gear N1 and the test changeover switch 30 selects one of the second channel selection gears, the control signal corresponding to the signal channel is cut off and output, and the remaining control signal is output to the nuclear power plant control apparatus 200 through the corresponding signal channel, and the nuclear power plant control apparatus 200 performs redundant automatic operation according to the magnitude and the number of the received control signals.
When the manual switch 10 selects one of the first channel selection gear and the test switch 30 selects one of the second channel selection gear corresponding to the same signal channel, the signal channel is selected and then selected to be cut off, so that no control signal is output to the nuclear power plant control device 200 at present, the nuclear power plant control device 200 cannot perform automatic control, and in order to achieve reliable switching to the manual mode, the control circuit 20 is further configured to trigger outputting of the manual control signal to the nuclear power plant control device 200 when both the manual switch 10 and the test switch 30 switch to the channel selection gear corresponding to the same signal channel, so that the nuclear power plant control device 200 switches to the manual mode, thereby reducing the switching delay of the nuclear power plant control device 200, avoiding the nuclear power plant control device 200 from being in a non-control state, and improving the operation safety and reliability of the nuclear power plant control device 200.
As shown in fig. 3, in one embodiment, the nuclear power plant signal path switching control circuit 100 further includes a first indicator circuit 40 and a second indicator circuit 50;
The first indicator circuit 40 and the second indicator circuit 50 are respectively connected with the control circuit 20;
the control circuit 20 cuts off the corresponding signal channel when detecting that the control signal of one signal channel exceeds the preset signal threshold value, and controls the first indication circuit 40 to send out indication alarm information;
And outputting a manual control signal to the nuclear power plant control apparatus 200 when detecting that the control signals of the n signal channels all exceed the preset signal threshold value, so that the nuclear power plant control apparatus 200 is switched to the manual mode, and controlling the second indication circuit 50 to issue indication alarm information.
In this embodiment, when the manual selector switch 10 is switched to the first neutral gear N1, the control circuit 20 detects the control signal of each signal channel, and controls the first indicating circuit 40 and the second indicating circuit 50 to respectively send out indication alarm information in addition to the corresponding signal channel cutting operation and the switching control of the operation mode, so as to inform the operator of the state of the signal channel in the current automatic control mode, and remind the operator to pay attention to and intervene in time, when the first indicating circuit 40 sends out indication alarm information, the operator needs to make preparation for manual operation, and when the second indicating circuit 50 sends out indication alarm information, the operator should put into manual operation.
The first indicator circuit 40 and the second indicator circuit 50 may be a voice playing module, an indicator light, and the like, and the specific structure is not limited.
As shown in fig. 4, in one embodiment, the circuit includes a logic gate 21 and a controller U1;
The controller U1 is respectively connected with the signal ends of the m first channel selection gears A1-Am of the manual change-over switch 10, the signal ends of the m second channel selection gears B1-Bm of the test change-over switch 30, the m signal channels and the output end of the logic gate circuit 21, and the input end of the logic gate circuit 21 is respectively connected with the signal ends of the m first channel selection gears A1-Am of the manual change-over switch 10 and the signal ends of the m second channel selection gears B1-Bm of the test change-over switch 30;
A logic gate circuit 21 for outputting a mode switching signal to the controller U1 when both the manual switch 10 and the trial switch 30 are switched to a channel selection gear corresponding to the same signal channel;
The controller U1 is configured to trigger outputting a manual control signal to the nuclear power plant control apparatus 200 when receiving the mode switching signal, so that the nuclear power plant control apparatus 200 switches to the manual mode.
In this embodiment, the logic gate circuit 21 is configured to perform a manual mode triggering operation when the manual switch 10 and the trial switch 30 are both switched to the channel selection gear corresponding to the same signal channel, for example, when the manual switch 10 is selected to the first channel selection gear A1 corresponding to the first signal channel L1 and the trial switch 30 is selected to the second channel selection gear B1 corresponding to the first signal channel L1, the logic gate circuit 21 outputs a mode switching signal corresponding to a high-low level to the control circuit 20, and the control circuit 20 controls the nuclear power plant control apparatus 200 to switch to the manual mode after receiving the mode switching signal.
The type of the controller U1 may be selected correspondingly, for example, a single-chip microcomputer, a microprocessor, a central processing unit, etc.
With continued reference to fig. 4, the logic gate 21 may select a corresponding and gate U2 or gate U3 structure, and in one embodiment, the logic gate 21 includes m and gates U2 and a plurality of or gates U3;
The first channel selection gear and the second channel selection gear corresponding to the same signal channel are connected with an AND gate U2, and the output end of each AND gate U2 is correspondingly connected with a plurality of OR gates U3.
When the first channel selection gear and the second channel selection gear which are correspondingly connected are both selected, the and gate U2 outputs a high level, and meanwhile, outputs the high level to the controller U1 through the or gate U3, so as to trigger the nuclear power plant control device 200 to switch to the manual mode, and the number of the or gates U3 is correspondingly set according to the type of the corresponding selection or gate U3 and the number of the and gates U2, and may include one or more.
As shown in fig. 5, in one embodiment, the signal channel switching control circuit 100 of the nuclear power plant further includes a display module 60 for displaying the parameter values of the control signals, where the display module 60 is connected to the control circuit 20, and the control circuit 20 detects the control signal values of the signal channels and simultaneously controls the display module 60 to display correspondingly, so as to inform the operator of the current parameter, the control signal state and the control mode, and remind the operator to pay attention to and intervene in time.
The invention also provides a nuclear power plant signal channel switching control device, which comprises a nuclear power plant signal channel switching control circuit 100, wherein the specific structure of the nuclear power plant signal channel switching control circuit 100 refers to the embodiment, and the nuclear power plant signal channel switching control device adopts all the technical schemes of all the embodiments, so that the device at least has all the beneficial effects brought by the technical schemes of the embodiments, and the details are not repeated.
In this embodiment, by setting the nuclear power plant signal channel switching control circuit 100, the risk of human factor failure of the nuclear power plant control device 200 can be reduced, alarm monitoring is increased, and when two paths of measurement channels are abnormal, the system automatically switches the associated execution mechanism to manual control, so that the risk of the control function failure to the unit can be reduced to the maximum extent.
Meanwhile, the redundant signal channels and the control circuit 20 are added, so that the number of key sensitive devices can be effectively reduced, the reliability of a control function can be improved, and the automation level of a power station can be improved.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (10)
1. A nuclear power plant signal path switching control circuit, comprising:
The redundant m paths of signal channels are used for respectively outputting control signals to the nuclear power plant control equipment so as to redundantly control the nuclear power plant control equipment to work in an automatic mode;
The manual change-over switch is provided with m+1 gears, and comprises a first neutral gear and m first channel selection gears which are arranged in one-to-one correspondence with m signal channels;
the manual change-over switch outputs no channel selection signal when switching to the first neutral gear, and triggers and outputs a corresponding first channel selection signal when switching to one of the first channel selection gears;
The control circuit is used for acquiring control signals of all the signal channels, cutting off the corresponding signal channel when detecting that the control signals of one signal channel exceed a preset signal threshold value, and outputting a manual control signal to nuclear power plant control equipment when detecting that the control signals of n signal channels exceed the preset signal threshold value so as to enable the nuclear power plant control equipment to switch to a manual mode, wherein m > n is more than or equal to 2;
And triggering and selecting the corresponding signal channel to output the control signal when receiving the corresponding first channel selection signal, and cutting off the rest signal channels.
2. The nuclear power plant signal path switching control circuit of claim 1, further comprising:
The test change-over switch is connected with the control circuit and is provided with m+1 gears, and comprises a second neutral gear and m second channel selection gears which are arranged in one-to-one correspondence with m signal channels;
the test change-over switch is used for triggering and outputting a corresponding second channel selection signal when switching to one of the second channel selection gears;
The control circuit is further configured to cut off the corresponding signal channel when the second channel selection signal is received.
3. The nuclear power plant signal path switching control circuit of claim 1, further comprising a first indicator circuit and a second indicator circuit;
The first indicating circuit and the second indicating circuit are respectively connected with the control circuit;
The control circuit cuts off the corresponding signal channel when detecting that the control signal of one signal channel exceeds a preset signal threshold value, and controls the first indication circuit to send out indication alarm information;
and outputting a manual control signal to the nuclear power plant control equipment when detecting that the control signals of the n paths of signal channels exceed a preset signal threshold value, so that the nuclear power plant control equipment is switched to a manual mode, and controlling the second indicating circuit to send out indication alarm information.
4. The nuclear power plant signal path switching control circuit of claim 2, wherein the control circuit is further configured to:
and when the manual change-over switch and the test change-over switch are switched to the channel selection gear corresponding to the same signal channel, triggering and outputting a manual control signal to the nuclear power plant control equipment so as to enable the nuclear power plant control equipment to be switched to a manual mode.
5. The nuclear power plant signal path switching control circuit of claim 4, wherein the circuit includes a logic gate circuit and a controller;
The controller is respectively connected with the signal ends of the m first channel selection gears of the manual change-over switch, the signal ends of the m second channel selection gears of the test change-over switch, the m signal channels and the output end of the logic gate circuit, and the input end of the logic gate circuit is respectively connected with the signal ends of the m first channel selection gears of the manual change-over switch and the signal ends of the m second channel selection gears of the test change-over switch;
The logic gate circuit is used for outputting a mode switching signal to the controller when the manual switch and the test switch are switched to the channel selection gear corresponding to the same signal channel;
The controller is used for triggering and outputting a manual control signal to the nuclear power plant control equipment when receiving the mode switching signal so as to enable the nuclear power plant control equipment to be switched to a manual mode.
6. The nuclear power plant signal path switching control circuit of claim 5, wherein the logic gate circuit comprises m and gates and a plurality of or gates;
The first channel selection gear and the second channel selection gear corresponding to the same signal channel are connected with one AND gate, and the output end of each AND gate is correspondingly connected with a plurality of OR gates.
7. The nuclear power plant signal path switching control circuit of claim 1, further comprising a display module for displaying a parameter magnitude of the control signal, the display module being coupled to the control circuit.
8. The nuclear power plant signal path switching control circuit of claim 1, wherein m is equal to 3 and n is equal to 2.
9. The nuclear power plant signal path switching control circuit of claim 1, wherein the manual switch comprises a hard switch comprising a knob and a gear panel disposed in correspondence with the knob, the gear panel comprising m+1 gears including a first neutral gear and m first path selection gears disposed in one-to-one correspondence with m signal paths.
10. A nuclear power plant signal path switching control apparatus comprising a nuclear power plant signal path switching control circuit as claimed in any one of claims 1 to 9.
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| CN114326493A (en) | 2022-04-12 |
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