CN201607962U - Nuclear power station conventional island switchgear redundancy control system - Google Patents
Nuclear power station conventional island switchgear redundancy control system Download PDFInfo
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- CN201607962U CN201607962U CN200920261413XU CN200920261413U CN201607962U CN 201607962 U CN201607962 U CN 201607962U CN 200920261413X U CN200920261413X U CN 200920261413XU CN 200920261413 U CN200920261413 U CN 200920261413U CN 201607962 U CN201607962 U CN 201607962U
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Abstract
The utility model discloses a nuclear power station conventional island switchgear redundancy control system which includes a first control equipment cabinet and a second control equipment cabinet; the first control equipment cabinet includes a first signal input unit, a first CPU and a second CPU, a first signal input unit and a first communication unit; when the first CPU is abnormal, the second CPU automatically switches from a hot standby state to a running state; the second control equipment cabinet includes a second signal input unit, a third CPU, a fourth CPU, a second signal output unit and a second communication unit; when the third CPU is abnormal, the fourth CPU automatically switches from the hot standby state to the running state; a first control command and a second control command outputted by the first signal output unit and the second signal output unit are feed back to a local actuating mechanism after operational processing. The utility model also relates to another redundancy control system. The technical scheme of the utility model can improve the safety and reliability of the equipment and is convenient for the dynamic monitoring and real time operation of operating personnel.
Description
Technical field
The utility model relates to the Redundant Control field, more particularly, relates to a kind of nuclear power station conventional island switching mode equipment redundancy control system.
Background technology
In the prior art, along with the automatization level of the control of nuclear power station Large scale construction and nuclear power generating sets improves constantly, digital instrumentation and control system (DCS) are widely applied in the control systems of nuclear power plant.The defence notion is the cardinal rule of nuclear plant safety control, and security concept must be based on the determinacy requirement, and with probability analysis as supplementary means.For realizing high security and availability objective, the structure of digital instrumentation and control system (DCS) should satisfy following requirement:
1) multifarious security function must be assigned in different instrument and the control system (or subsystem), is required the overall reliability target that reaches to satisfy;
2) instrument and control system (or equipment) should consider that enough diversity the possibility of common cause fault occurs to minimize hardware and software;
3) function of different stage should as far as possible reasonably be assigned in different instrument and the control system (or subsystem) to reduce the work and the cost of Quality Identification;
4) structure of instrument and control system should be simplified, and the quantity of exchanges data amount and interface should minimize;
5) structure of instrument and control system should have extensibility to satisfy the needs of future development and update;
6) should adopt internal and international standard.
The core that nuclear power station conventional island instrument control system monitors and controls as conventional island with DCS, DCS should satisfy the reliability requirement that is complementary with its execution function when carrying out various controls, defencive function.At present, the important protection of the steam turbine backup system of conventional thermal power plant and control are not partly considered Redundant Control to IO module section in each link of DCS system and arithmetic logic.The consequence that this situation occurs is; because IO fastener and rack will be realized the control to a lot of equipment; when certain piece IO module break down or in same rack heat be equipped with two CPU simultaneous faultss the time; the DCS system can't control and protect the equipment in this IO fastener or this rack; operator can't monitor these equipment, and then influence security, reliability and the economy of power station operation.
The utility model content
The technical problems to be solved in the utility model is, at the above-mentioned security and the lower defective of reliability of prior art, provides a kind of nuclear power station conventional island switching mode equipment redundancy control system.
The technical scheme that its technical matters that solves the utility model adopts is: construct a kind of nuclear power station conventional island switching mode equipment redundancy control system, it is characterized in that, comprising:
The first control rack and the second control rack;
The described first control rack comprises first signal input unit, is used to carry out a CPU and the 2nd CPU, first signal output unit of arithmetic logic, is used to first communication unit of realizing that a CPU and the 2nd CPU communicate with one another;
Input signal is delivered to a CPU through first signal input unit and is carried out logical process and export first steering order through first signal output unit again; The 2nd CPU is the backup of a CPU, and when a CPU occurs when unusual, the 2nd CPU is equipped with state from heat automatically and switches to running status;
The second control rack comprises the secondary signal input block, is used to carry out the 3rd CPU and the 4th CPU, the secondary signal output unit of arithmetic logic, is used to the second communication unit of realizing that the 3rd CPU and the 4th CPU communicate with one another;
Input signal is delivered to the 3rd CPU through the secondary signal input block and is carried out logical process and export second steering order through the secondary signal output unit again; The 4th CPU is the backup of the 3rd CPU, and when the 3rd CPU occurs when unusual, the 4th CPU is equipped with state from heat automatically and switches to running status;
First steering order and second steering order are delivered to topworks on the spot after handling through exclusive disjunction.
In nuclear power station conventional island switching mode equipment redundancy control system described in the utility model, also comprise first signal gathering unit and the secondary signal collecting unit that are used to gather the switching mode status information of equipment; First signal gathering unit is exported first guard signal to first signal input unit, and the secondary signal collecting unit is exported second guard signal to the secondary signal input block.
In nuclear power station conventional island switching mode equipment redundancy control system described in the utility model, described comprise unusually following any: CPU breaks down, the switching between the CPU is broken down.
In nuclear power station conventional island switching mode equipment redundancy control system described in the utility model, first signal input unit and secondary signal input block are that switching value input fastener, first signal output unit and secondary signal output unit are on-off output card spare.
In nuclear power station conventional island switching mode equipment redundancy control system described in the utility model, first signal input unit and secondary signal input block are that digital quantity input fastener, first signal output unit and secondary signal output unit are digital quantity output fastener; Or
First signal input unit and secondary signal input block are that analog signal input card spare, first signal output unit and secondary signal output unit are analog output unit spare.
The utility model also provides a kind of nuclear power station conventional island switching mode equipment redundancy control system, comprising:
The control rack;
Described control rack comprises main signal input block and space signal input block, be used to carry out host CPU and spare CPU, main signal output unit and the space signal output unit of arithmetic logic, be used to realize first communication unit that host CPU and spare CPU communicate with one another, be used to realize second communication unit that main signal input block and space signal input block communicate with one another, be used to the third communication unit of realizing that main signal output unit and space signal output unit communicate with one another;
Input signal is delivered to host CPU through the main signal input block and is carried out logical process again through main signal output unit output steering order;
The space signal input block is the backup of main signal input block, when the main signal input block occurs when unusual, the space signal input block automatically/switch to running status;
Spare CPU is the backup of host CPU, when host CPU occurs when unusual, spare CPU automatically/running status;
The space signal output unit is the backup of main signal output unit, when the main signal output unit occurs when unusual, the space signal output unit automatically/switch to running status.
In nuclear power station conventional island switching mode equipment redundancy control system described in the utility model, also comprise first signal gathering unit and the secondary signal collecting unit that are used to gather the switching mode status information of equipment; First signal gathering unit is exported first guard signal to the main signal input block, and the secondary signal collecting unit is exported second guard signal to the space signal input block.
In nuclear power station conventional island switching mode equipment redundancy control system described in the utility model, main signal input block and space signal input block are intelligent fastener; Main signal output unit and space signal output unit are intelligent fastener.
In nuclear power station conventional island switching mode equipment redundancy control system described in the utility model, main signal input block and space signal input block are that digital quantity input fastener, main signal output unit and space signal output unit are digital quantity output fastener.
In nuclear power station conventional island switching mode equipment redundancy control system described in the utility model, main signal input block and space signal input block are that analog signal input card spare, main signal output unit and space signal output unit are analog output unit spare.
Implement the technical solution of the utility model, have following beneficial effect: the nuclear power station conventional island switching mode equipment redundancy control system according to the utility model provides can provide the Redundant Control to each link in the DCS system (as IO module section, arithmetic logic part).Make and to break down or during two CPU simultaneous faultss in same rack when certain piece IO module; the DCS system still can control and protects the equipment in this IO fastener or this rack; operator still can monitor these equipment; can not influence the normal operation in power station because of above-mentioned fault; thereby security, reliability have been improved; the economic loss of having avoided hindering for some reason and having caused also is convenient to dynamic monitoring and the true-time operation of operating personnel to equipment state.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the nuclear power station conventional island switching mode equipment redundancy control system structural representation according to the utility model one preferred embodiment;
Fig. 2 is the nuclear power station conventional island switching mode equipment redundancy control system structural representation according to another preferred embodiment of the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Nuclear power station adopts after the Digitizing And Control Unit; characteristics based on nuclear power station self; be to guarantee the operation that nuclear power station can be safe, reliable and economic, the control that digital instrumentation and control system (DCS) provide for nuclear power station conventional island important system and process equipment, the reliability requirement of salvo are higher.The utility model provides a kind of nuclear power station conventional island switching mode equipment redundancy control system, to realize protection and the control to the important switching mode equipment of nuclear power station conventional island.
Fig. 1 is nuclear power station conventional island switching mode equipment redundancy control system 100 structural representations according to the utility model one preferred embodiment.The redundancy control system that this embodiment provides is to adopt redundant hardware, redundant software logic to realize control (line among the figure: on behalf of hardware, solid line realize, on behalf of software, dotted line realize) in the control rack of redundancy.This embodiment is applicable to that the signal input unit of DCS system and signal output unit (being the I/O fastener) self do not have calculation function, do not belong to the situation of intelligent I/O fastener.The power station that for example has 4 1,000,000 units, the non-safe level control of control system platform adopts the HOLLIYS system of Hollysys.Only be example, conduct is not to restriction of the present utility model herein.
As shown in Figure 1, redundancy control system 100 comprises the first control rack 101 and the second control rack 102.This first control rack 101 comprises first signal input unit 1011, is used to carry out a CPU 1012 and the 2nd CPU 1013, first signal output unit 1014 of arithmetic logic, is used to first communication unit 1015 of realizing that a CPU 1012 and the 2nd CPU 1013 communicate with one another.Input signal (by the guard signal of collecting unit output) is delivered to a CPU 1012 through first signal input unit 1011 and is carried out logical process again through first signal output unit, 1014 outputs, first steering order; The 2nd CPU1013 is the backup of a CPU 1012, and when a CPU 1012 appearance were unusual, the 2nd CPU 1013 was equipped with state from heat automatically and switches to running status.
It is consistent that the structure and first of the second control rack 102 is controlled rack 101, comprise secondary signal input block 1021, be used to carry out arithmetic logic the 3rd CPU 1022 and the 4th CPU 1023, secondary signal output unit 1024, be used to the second communication unit 1025 of realizing that the 3rd CPU 1022 and the 4th CPU 1023 communicate with one another.Input signal (by the guard signal of collecting unit output) is delivered to the 3rd CPU 1022 through secondary signal input block 1021 and is carried out logical process again through secondary signal output unit 1024 outputs second steering order; The 4th CPU 1023 is the backup of the 3rd CPU 1022, and when the 3rd CPU1022 occurs when unusual, the 4th CPU 1023 is equipped with state from heat automatically and switches to running status.First steering order and second steering order are delivered to topworks on the spot after handling through exclusive disjunction, realize the control to equipment and system.
In addition, also comprise redundant signal source, promptly realize redundant at process system interface layer (level0 shown in Fig. 1).Rong Yu signal source is first signal gathering unit 1031 and the secondary signal collecting unit 1032 that is used to gather the switching mode status information of equipment in the present embodiment; First signal gathering unit 1031 is to first signal input unit, 1011 outputs, first guard signal, and secondary signal collecting unit 1032 is to secondary signal input block 1021 outputs second guard signal.Have extensive capital equipment need use logic control in the production process of nuclear power plant, as switch of the start and stop of motor, pump, valve, baffle plate etc., the signal of these equipment has all constituted signal source.
Guard signal comprises a variety of, such as but not limited to the switch state signal of pressure switch, flow switch, temperature switch, level switch and various device.Redundant means mainly contain: same measuring point is provided with two independently test instrumentations (if possible, the instrument of two kinds of different measuring modes can be set, to prevent common mode failure), and test instrumentation divides A, B two row (i.e. Rong Yu instrument) to realize same function etc.Only be example, conduct is not to restriction of the present utility model herein.According to the Different Logic of controlled device control input can be the switching node signal, also can be various level signals, and the I/O fastener by DCS transfers 0 and 1 unified signal to.
The controlling object of logic control has valve plate washer, solenoid valve of electro-motor, two systems etc.Same difference according to controlled device, the also exportable different logical signal of DCS such as switching node signal or level signal etc., the principal feature of logic control is that control signal all is two, is described as 0 and 1.
The roughly workflow of this system is as follows: first and second guard signals that input to DCS first signal input unit 1011 and secondary signal input block 1012 from Level0 (process system interface layer) are delivered to respectively the control rack of 2 redundancies; each rack is respectively through 1 signal input unit (I/O fastener) in these two control racks; deliver to the CPU that the redundant heat in this rack is equipped with and carry out logical process; again respectively through the output of the signal output unit of rack (I/O fastener) separately steering order; 2 steering orders of two racks output are after for example carrying out relay alternative logic (exclusive disjunction); deliver to topworks on the spot, realize control equipment and system.The topworks on the spot here comprises a lot, for example the feedwater gateway door protection of high-pressure heater system, low-pressure heater system, condensate system, condenser pumped vacuum systems etc.The collection that server is real-time and monitor the running status of two racks, operating personnel can carry out interactive communication with CPU in two racks by nuclear power station computerized information control system (KIC), realize dynamic monitoring and true-time operation to equipment state.Adopt the The whole control loop of this system in the switch board of two redundancies, to realize; when CPU that a pair of redundant heat in certain switch board is equipped with switching between unusual or two CPU occurs and goes wrong; can not influence the operation of control loop, improve the reliability of system.
Redundancy for the I/O fastener: the I/O fastener is to be gathered and changes input signal, and output signal is carried out the unit that amplitude limit etc. is handled.The I/O fastener is divided into a variety of according to the type of gathering and export, comprising: digital quantity input fastener, digital quantity output fastener, analog signal input card spare, analog output unit spare or the like, hereinafter will do simple introduction to various fasteners.The fastener of using in native system is switching value input fastener and on-off output card spare.For the I/O fastener that needs redundant configuration, need carry out special setting to it.
Digital quantity input fastener: two-position signal enters DCS by digital quantity input fastener, difference according to on-site signal has many kinds of digital quantity input fasteners supporting with it, there is level to import, there is switching node to import, low-voltage is arranged, high voltages are arranged, all change 0 and 1 logical signal into after entering fastener.
Digital quantity output fastener: logic operation result is sent to field apparatus by digital quantity output fastener among the DCS, mixes different output cards according to the needs of field apparatus, as relay etc., controls field apparatus.
Simulate amount input signal conversion fastener AI: simulate amount input signal conversion fastener is that signal transition is the digital signal of computing machine in the DCS with the electricity that transmitter comes, and at different input electric weight different input signal conversion fasteners is arranged.
Simulate amount output signal conversion fastener AO: simulate amount output signal conversion fastener converts the digital signal of computing machine in the DCS to the 4-20mA command signal of control executing mechanism.
Redundancy for arithmetic logic: arithmetic logic is mainly realized in CPU.In conventional power plant design, CPU has done redundant heat and has been equipped with, and promptly in a rack, adopts two CPU to realize control to system, as host CPU equipment is controlled for one, and another is in heat state fully, but arithmetic logic has only calculated once.For several links such as network, server, KIC demonstration and indications, DCS has also done the reliabilty and availability that a series of redundancy improves the DCS system.But nuclear power station is identical with the method that conventional power plant is adopted, and does not just do at this and gives unnecessary details.
The redundancy control system that present embodiment provides uses redundant signal gathering unit, redundant arithmetic logic (mainly realizing), redundant control rack in CPU, security function can be assigned in each link of digital instrumentation and control system, be required the overall reliability target that reaches to satisfy.
Fig. 2 is the nuclear power station conventional island switching mode equipment redundancy control system structural representation according to another preferred embodiment of the utility model.In the present embodiment, adopt redundant I/O fastener to realize control in the cover control rack, promptly use redundant I/O fastener, the CPU that a pair of redundant heat is equipped with.This situation is applicable to that the IO fastener of the non-safe level platform of DCS belongs to the type of intelligent IO fastener, and some computings of respective execution mechanisms driving etc. can realize in the I/O fastener that the output of redundancy protecting can be switched on intelligent fastener.For example the non-safe level control platform of the control system in power station adopts the T-XP platform of Siemens.In view of intelligent fastener has above-mentioned advantage, in line with the principle of saving cost, nuclear power station conventional island switching mode equipment redundancy control system is preferentially selected this scheme for use.
First signal gathering unit 2010 is exported first guard signal to the main signal input block, and secondary signal collecting unit 2011 is exported second guard signal to the space signal input block.Have extensive capital equipment need use logic control in the production process of nuclear power plant, as switch of the start and stop of motor, pump, valve, baffle plate etc., the signal of these equipment has all constituted signal source.
Guard signal comprises a variety of, such as but not limited to the switch state signal of pressure switch, flow switch, temperature switch, level switch and various device.Redundant means mainly contain: same measuring point is provided with two independently test instrumentations (if possible, the instrument of two kinds of different measuring modes can be set, to prevent common mode failure), and test instrumentation divides A, B two row (i.e. Rong Yu instrument) to realize same function etc.Only be example, conduct is not to restriction of the present utility model herein.According to the Different Logic of controlled device control input can be the switching node signal, also can be various level signals, and the I/O fastener by DCS transfers 0 and 1 unified signal to.
First guard signal is delivered to host CPU 2003 through main signal input block 2001 and is carried out logical process again through main signal output unit 2005 output steering orders.Second guard signal is not exported the result after handling through space signal input block 2002.Space signal output unit 2006 drives function with 2005 parallel processings of main signal output unit, but output order not.Space signal input block 2002 is the backup of main signal input block 2001, and when 2001 appearance of main signal input block were unusual, space signal input block 2002 automatically switched to running status; Spare CPU 2004 is the backup of host CPU 2003, and when host CPU 2003 appearance were unusual, spare CPU 2004 automatically switched to running status; Space signal output unit 2006 is the backup of main signal output unit 2005, and when 2005 appearance of main signal output unit were unusual, space signal output unit 2006 automatically switched to running status.
The DCS system disposes 2 I/O fasteners by the principal and subordinate and realizes the driver module function, 2 I/O fasteners all receive the signal from Level0, driving stage equipment output order drives by main I/O fastener, drive function from the parallel processing of I/O module, but output order not, when main I/O fastener fault, replace main I/O fastener automatically from I/O fastener module and come output order, promptly actual have only one to open (startups) instruction or a pass (stopping) being instructed from what redundant I/O fastener exported Level0 to.The steering order of output is delivered to topworks on the spot, realizes the control to equipment and system.The topworks on the spot here comprises a lot, for example the feedwater gateway door protection of high-pressure heater system, low-pressure heater system, condensate system, condenser pumped vacuum systems etc.The collection that server is real-time and monitor the running status of two racks, operating personnel can carry out interactive communication with CPU in two racks by nuclear power station computerized information control system (KIC), realize dynamic monitoring and true-time operation to equipment state.Adopt the The whole control loop of this system in the switch board of two redundancies, to realize; when CPU that a pair of redundant heat in certain switch board is equipped with switching between unusual or two CPU occurs and goes wrong; can not influence the operation of control loop, improve the reliability of system.
Redundancy for the I/O fastener: the ruuning situation of intelligent I/O fastener is two one group in the present embodiment, and next fortune one of normal condition is equipped with, and when one of them I/O fastener broke down, another I/O fastener can automatically switch to running status.
Redundancy for arithmetic logic: arithmetic logic is mainly realized in CPU.In conventional power plant design, CPU has done redundant heat and has been equipped with, and promptly in a rack, adopts two CPU to realize control to system, as host CPU equipment is controlled for one, and another is in heat state fully, but arithmetic logic has only calculated once.For several links such as network, server, KIC demonstration and indications, DCS has also done the reliabilty and availability that a series of redundancy improves the DCS system.But nuclear power station is identical with the method that conventional power plant is adopted, and does not just do at this and gives unnecessary details.
The Redundancy Design of present embodiment control system mainly comprises: the redundancy of the redundancy of the redundancy of signal gathering unit, signal input fastener, the redundancy of CPU and signal output fastener, satisfied all redundant requirement that is provided with of each link of control loop.Adopt this method, some computings that make that topworks correspondingly drives etc. can realize in the I/O fastener that protection, logical process are redundant, are again that the principal and subordinate disposes, thereby guarantee that soft, hardware all can finish redundancy in a rack.Relatively simple for structure, switch than being easier to and realize, can also guarantee the raising of reliability simultaneously.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (9)
1. a nuclear power station conventional island switching mode equipment redundancy control system is characterized in that, comprising:
The first control rack and the second control rack;
The described first control rack comprises first signal input unit, is used to carry out a CPU and the 2nd CPU, first signal output unit of arithmetic logic, is used to first communication unit of realizing that a CPU and the 2nd CPU communicate with one another;
Input signal is delivered to a CPU through first signal input unit and is carried out logical process and export first steering order through first signal output unit again; The 2nd CPU is the backup of a CPU, and when a CPU occurs when unusual, the 2nd CPU is equipped with state from heat automatically and switches to running status;
The second control rack comprises the secondary signal input block, is used to carry out the 3rd CPU and the 4th CPU, the secondary signal output unit of arithmetic logic, is used to the second communication unit of realizing that the 3rd CPU and the 4th CPU communicate with one another;
Input signal is delivered to the 3rd CPU through the secondary signal input block and is carried out logical process and export second steering order through the secondary signal output unit again; The 4th CPU is the backup of the 3rd CPU, and when the 3rd CPU occurs when unusual, the 4th CPU is equipped with state from heat automatically and switches to running status;
First steering order and second steering order are delivered to topworks on the spot after handling through exclusive disjunction.
2. nuclear power station conventional island switching mode equipment redundancy control system according to claim 1 is characterized in that, also comprises first signal gathering unit and the secondary signal collecting unit that are used to gather the switching mode status information of equipment; First signal gathering unit is exported first guard signal to first signal input unit, and the secondary signal collecting unit is exported second guard signal to the secondary signal input block.
3. according to each described nuclear power station conventional island switching mode equipment redundancy control system of claim 1～2, it is characterized in that first signal input unit and secondary signal input block are that switching value input fastener, first signal output unit and secondary signal output unit are on-off output card spare.
4. according to each described nuclear power station conventional island switching mode equipment redundancy control system of claim 1～2, it is characterized in that first signal input unit and secondary signal input block are that digital quantity input fastener, first signal output unit and secondary signal output unit are digital quantity output fastener; Or
First signal input unit and secondary signal input block are that analog signal input card spare, first signal output unit and secondary signal output unit are analog output unit spare.
5. a nuclear power station conventional island switching mode equipment redundancy control system is characterized in that, comprising:
The control rack;
Described control rack comprises main signal input block and space signal input block, be used to carry out host CPU and spare CPU, main signal output unit and the space signal output unit of arithmetic logic, be used to realize first communication unit that host CPU and spare CPU communicate with one another, be used to realize second communication unit that main signal input block and space signal input block communicate with one another, be used to the third communication unit of realizing that main signal output unit and space signal output unit communicate with one another;
Input signal is delivered to host CPU through the main signal input block and is carried out logical process again through main signal output unit output steering order;
The space signal input block is the backup of main signal input block, and when the main signal input block occurs when unusual, the space signal input block automatically switches to running status;
Spare CPU is the backup of host CPU, and when host CPU occurs when unusual, spare CPU is equipped with state from heat automatically and switches to running status;
The space signal output unit is the backup of main signal output unit, and when the main signal output unit occurs when unusual, the space signal output unit automatically switches to running status.
6. nuclear power station conventional island switching mode equipment redundancy control system according to claim 5 is characterized in that, also comprises first signal gathering unit and the secondary signal collecting unit that are used to gather the switching mode status information of equipment; First signal gathering unit is exported first guard signal to the main signal input block, and the secondary signal collecting unit is exported second guard signal to the space signal input block.
7. nuclear power station conventional island switching mode equipment redundancy control system according to claim 5 is characterized in that main signal input block and space signal input block are intelligent fastener; Main signal output unit and space signal output unit are intelligent fastener.
8. according to each described nuclear power station conventional island switching mode equipment redundancy control system of claim 5～7, it is characterized in that main signal input block and space signal input block are that digital quantity input fastener, main signal output unit and space signal output unit are digital quantity output fastener.
9. according to each described nuclear power station conventional island switching mode equipment redundancy control system of claim 5～7, it is characterized in that main signal input block and space signal input block are that analog signal input card spare, main signal output unit and space signal output unit are analog output unit spare.
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- 2009-12-11 CN CN200920261413XU patent/CN201607962U/en not_active Expired - Lifetime
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