CN110838378B - Nuclear power plant liquid level switch periodic test control system, control method and storage medium - Google Patents

Nuclear power plant liquid level switch periodic test control system, control method and storage medium Download PDF

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Publication number
CN110838378B
CN110838378B CN201911012722.8A CN201911012722A CN110838378B CN 110838378 B CN110838378 B CN 110838378B CN 201911012722 A CN201911012722 A CN 201911012722A CN 110838378 B CN110838378 B CN 110838378B
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liquid level
level switch
column
test
switch assembly
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CN110838378A (en
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尹刚
曾彬
顾凯
张冲
顾珊珊
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China General Nuclear Power Corp
China Nuclear Power Engineering Co Ltd
CGN Power Co Ltd
Shenzhen China Guangdong Nuclear Engineering Design Co Ltd
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China General Nuclear Power Corp
China Nuclear Power Engineering Co Ltd
CGN Power Co Ltd
Shenzhen China Guangdong Nuclear Engineering Design Co Ltd
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D3/00—Control of nuclear power plant
    • G21D3/001—Computer implemented control
    • G21D3/002—Core design; core simulations; core optimisation
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D3/00—Control of nuclear power plant
    • G21D3/007—Expert systems
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D3/00—Control of nuclear power plant
    • G21D3/04—Safety arrangements
    • G21D3/06—Safety arrangements responsive to faults within the plant
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin

Abstract

The invention provides a control system, a method and a storage medium for a liquid level switch periodic test of a nuclear power plant, wherein the control system, the method and the storage medium comprise a periodic test for starting a plurality of columns of liquid level switch assemblies and a starting selection module for selecting a corresponding liquid level switch test; the control execution module cuts off the selected test columns from the DCS protection system and operates the water injection isolation assemblies corresponding to the selected test columns; receiving a liquid level signal of a test column of the selected liquid level switch assembly, transmitting the liquid level signal to the control execution module and outputting a test result to the liquid level switch signal receiving module; according to the invention, all modules of the control system are integrated in the DCS, so that only the liquid level switch signal of the test column is cut off from the DCS protection system during testing, and the liquid level switch component of the non-test column still normally participates in protection, thereby solving the defects that the control needs to be realized through extra hardware in the prior art and the technical problem that equipment failure easily causes misoperation of the DCS protection system in the prior art, and being beneficial to the safe operation of a unit.

Description

Nuclear power plant liquid level switch periodic test control system, control method and storage medium
Technical Field
The invention relates to the technical field of thermal power and nuclear power, relates to a design scheme of a periodic test of a liquid level switch and a pressure switch of a power plant, and particularly relates to a control system, a control method and a storage medium of the periodic test of the liquid level switch of the nuclear power plant.
Background
The liquid level switch monitors the container water level commonly used in power plant, generally adopts 3 liquid level switches to be used for liquid level interlocking protection, when the water tank liquid level reached certain definite value, liquid level switch will move, because liquid level switch is mechanical type structure usually, there is the possibility of refusing to move if long-term inaction, and liquid level switch relates to system interlocking protect function, and is very important, consequently necessary quality through periodic test verification liquid level switch, the power plant can be to participating in the mechanical type liquid level switch of interlocking protection and do periodic test once about every 2 months usually. The periodic test of the liquid level switch is to ensure that the control protection function of the system is available, which is a necessary link in the operation process of a power plant, but how to ensure the accuracy of the periodic test result of the liquid level switch, ensure that the periodic test operation does not influence the normal interlocking protection function of the system, and ensure that the fault of the periodic test loop of the liquid level switch does not cause the misoperation or the operation failure of the protection loop is a difficult problem faced by the power plant.
In the prior art, channel acquisition of a liquid level switch signal is firstly acquired by a local test box and then transmitted to a DCS (distributed control system) to complete interlocking protection operation, and an operation output result interlocks and controls a field actuator, such as closing a field water inlet valve in an interlocking manner or interlocking and stopping a pump, a fan and the like. The periodic test operation of the liquid level switch is usually completed on an on-site test box, and a test selection switch CC, a light test button and a plurality of test result indicating lights are arranged on a control panel of the on-site test box. Periodic testing is done by a field operator. In addition, the integrity of the content of the regular test verification of the liquid level switch, the convenience of the regular test operation and the risk control of human errors are also the content which must be considered by a designer. In the in-situ test box device in the prior art, an indicator lamp, a selector switch and the like are physically controlled, an additional hardware device is needed, the selector switch is physically grounded, the DCS system is easily damaged, the fault rate is high, the DCS interlocking protection function is failed or the malfunction is caused, and certain potential safety hazards exist.
Accordingly, the prior art is deficient and needs improvement.
Disclosure of Invention
Aiming at the potential safety hazard problems of high failure rate, failure of DCS interlocking protection function or misoperation in the prior art, the invention provides the control system, the control method and the storage medium for the nuclear power plant liquid level switch periodic test, which have high integration level and high safety and can avoid the DCS protection system from being damaged easily due to an additional hardware device.
The technical scheme provided by the invention for the technical problem is as follows:
the invention provides a control system for a nuclear power plant liquid level switch periodic test, which is integrated in a DCS (distributed control system) and used for testing a plurality of rows of liquid level switch assemblies, wherein the plurality of rows of liquid level switch assemblies are respectively connected with a DCS protection system, and the control system comprises: the starting selection module is used for starting the periodic test of the multi-column liquid level switch assembly and selecting a test column of the corresponding liquid level switch assembly for starting the test; the control execution module is connected with the starting selection module and used for cutting off the selected test column from the DCS protection system and operating the water injection isolation assembly correspondingly connected with the selected test column; and the liquid level switch signal receiving module is respectively connected with the control execution module and the liquid level switch assembly and is used for receiving the liquid level signal of the test column of the selected liquid level switch assembly and transmitting the liquid level signal to the control execution module and outputting a test result.
Wherein the control execution module includes: the switching module is connected with the starting selection module and is used for cutting off a liquid level switch signal of one test column obtained from the plurality of liquid level switch assemblies from the DCS protection system; and the operation module is connected with the switching module and the isolation water injection assembly and used for controlling the water injection isolation assembly of the column to be tested, isolating the connection between the liquid level switch assembly of the column to be tested and the water tank and switching on a pipeline between the liquid level switch assembly of the column to be tested and the water injection port to perform water injection operation.
The operation module is further used for putting the finished test column liquid level switch assembly into the DCS protection system again after the test of the selected test column liquid level switch is finished, cutting off the liquid level switch assembly of the other non-test column from the DCS protection system, isolating the connection between the water tank and the non-test column liquid level switch assembly, and connecting the connection between the non-test column liquid level switch assembly and the water injection port to perform water injection operation.
Wherein the control execution module further comprises: and the calculation module is used for sequentially calculating the deviation between the actual action value and the designed fixed value of the liquid level switch of the corresponding liquid level switch assembly by adopting a three-out-of-two protection logic according to the received liquid level signal of the test column, judging whether the deviation exceeds an allowable value one by one, and triggering a liquid level switch fault signal of the corresponding liquid level switch assembly and giving an alarm if the deviation exceeds the allowable value.
The multi-column liquid level switch assembly comprises an A column liquid level switch assembly and a B column liquid level switch assembly, and the A column liquid level switch assembly and the B column liquid level switch assembly are respectively connected to the starting selection module; the starting selection module is used for starting the periodic tests of the liquid level switch assemblies of the A column and the B column and selecting the liquid level switch assembly of the A column as a switch test column at first; the control execution module is used for controlling the liquid level switch assemblies for executing the A-column and the B-column to be sequentially started, cutting off the connection between the A-column liquid level switch assembly and the DCS protection system and controlling the water injection isolation assembly of the A-column to perform water injection operation when the A-column liquid level switch assembly test is executed, and the B-column liquid level switch assembly is still connected with the DCS protection system and normally monitors the liquid level of the water tank; the liquid level switch signal receiving module is used for receiving liquid level signals of the A-column test columns, transmitting the liquid level signals of the A-column test columns to the control execution module and outputting test results of the A-column liquid level switches after water injection; the starting selection module is further used for selectively starting the B-column liquid level switch assembly to test after the A-column liquid level switch assembly is tested, the control execution module is further used for switching the A-column liquid level switch assembly back to the DCS protection system to monitor the normal liquid level in the water tank, and the B-column liquid level switch assembly is isolated again to complete the test on the B-column liquid level switch assembly.
The water injection isolation assembly comprises a first water injection isolation valve assembly connected with the A-row liquid level switch assembly and a second water injection isolation valve assembly connected with the B-row liquid level switch assembly; the first water injection isolation valve assembly and the second water injection isolation valve assembly are both connected to a water injection port; one end of the first water filling isolation valve assembly is connected to the water tank, the other end of the first water filling isolation valve assembly is connected to the liquid level switch assembly in the column A, one end of the second water filling isolation valve assembly is connected to the water tank, and the other end of the second water filling isolation valve assembly is connected to the liquid level switch assembly in the column B; the control execution module is also used for carrying out liquid level test on the A-row or B-row liquid level switch assembly, correspondingly communicating the A-row liquid level switch assembly or the B-row liquid level switch assembly with the communication of the water filling port through isolating the first water injection isolation valve assembly or the second water injection isolation valve assembly with the connection of the water tank, and respectively finishing the liquid level test of the A-row liquid level switch assembly or the B-row liquid level switch assembly after the communication.
The first water injection isolation valve component comprises a water injection valve, two isolation valves and an isolation valve; the second water injection isolation valve component comprises a water injection valve, two isolation valves and an isolation valve; the A-column liquid level switch assembly comprises an A-column balance container, an A-column measuring cylinder connected with the A-column balance container, three A-column liquid level switches arranged on the A-column measuring cylinder, an A-column liquid level meter and an A-column liquid level transmitter; the B-column liquid level switch assembly comprises a B-column balance container, a B-column measuring cylinder connected with the B-column balance container, three B-column liquid level switches arranged on the B-column measuring cylinder, a B-column liquid level meter and a B-column liquid level transmitter; and controlling the on-off of the pipelines of the water tank and the liquid level switch assembly by opening and closing the corresponding water injection valve and the corresponding isolating valve respectively, and performing tests corresponding to the liquid level switch respectively.
The liquid level switch assembly test line display device comprises a liquid level switch assembly, a display module and a starting selection module, wherein the display module comprises a touch screen area, the starting selection module is arranged in the touch screen area and used for displaying information of a started test line, displaying a plurality of test lines in the touch screen area, selecting the test lines and displaying a test result of the test line of the liquid level switch assembly corresponding to the selection.
The invention also provides a control method for the periodic test of the liquid level switch of the nuclear power plant, which comprises the following steps: starting a periodic test of a plurality of columns of liquid level switch assemblies and selecting a test column of the corresponding liquid level switch assembly for starting the test; cutting off a liquid level switch signal of one test column obtained from the plurality of columns of liquid level switch assemblies from the DCS protection system, controlling a water injection isolation assembly of the column to be tested, isolating the connection between the liquid level switch assembly of the column to be tested and the water tank, and switching on the connection between the liquid level switch assembly of the column to be tested and the water injection port to perform water injection operation; and receiving a liquid level signal of the test column of the selected liquid level switch assembly, transmitting the liquid level signal to the control execution module and outputting a test result. After the selected test column liquid level switch is tested, putting the tested test column liquid level switch assembly into the DCS protection system again, cutting off the other non-test column liquid level switch assembly still working from the DCS protection system, isolating the connection between the water tank and the other test column liquid level switch assembly, and switching on the connection between the other liquid level switch assembly and the water injection port to perform water injection operation; and according to the received liquid level signals of the test columns, adopting a three-out-of-two protection logic, sequentially calculating the deviation between the actual action value and the designed fixed value of the liquid level switch of the corresponding liquid level switch assembly, judging whether the deviation exceeds an allowable value one by one, and if the deviation exceeds the allowable value, triggering the fault signals of the liquid level switch of the corresponding liquid level switch assembly and giving an alarm.
In a third aspect of the present invention, a computer-readable storage medium is provided, in which a computer program is stored, and when the computer program is executed by a control system, the computer program performs the following steps: starting a periodic test of a plurality of columns of liquid level switch assemblies and selecting a test column of the corresponding liquid level switch assembly for starting the test; cutting off a liquid level switch signal of one test column obtained from the plurality of columns of liquid level switch assemblies from the DCS protection system, controlling a water injection isolation assembly of the column to be tested, isolating the connection between the liquid level switch assembly of the column to be tested and the water tank, and switching on the connection between the liquid level switch assembly of the column to be tested and the water injection port to perform water injection operation; and receiving a liquid level signal of the test column of the selected liquid level switch assembly, transmitting the liquid level signal to the control execution module and outputting a test result. After the selected test column liquid level switch is tested, putting the tested test column liquid level switch assembly into the DCS protection system again, cutting off the other non-test column liquid level switch assembly still working from the DCS protection system, isolating the connection between the water tank and the other test column liquid level switch assembly, and switching on the connection between the other liquid level switch assembly and the water injection port to perform water injection operation; and according to the received liquid level signals of the test columns, adopting a three-out-of-two protection logic, sequentially calculating the deviation between the actual action value and the designed fixed value of the liquid level switch of the corresponding liquid level switch assembly, judging whether the deviation exceeds an allowable value one by one, and if the deviation exceeds the allowable value, triggering the fault signals of the liquid level switch of the corresponding liquid level switch assembly and giving an alarm.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
by integrating the control system in the DCS, the protection circuit and the periodic test circuit related to the liquid level switch are electrically isolated in DCS software, so that the problem that the control of the other circuit fails due to the electrical fault of one circuit can be avoided; the invention sets A/B two rows of redundant liquid level switches, adopts two-out-of-three protection logic respectively, has high reliability, and during the test of one row of liquid level switches, the interlocking protection function of the other row of liquid level switches is still effective, thereby not influencing the normal operation of the unit and being beneficial to the safe operation of the unit; the liquid level switch test loop is completely electrically isolated from the normal protection loop, and the electrical fault of the test loop cannot cause the fault of the normal protection loop, so that the safe operation of the unit is facilitated; an on-site liquid level switch test box and an operation button are omitted, and the on-site liquid level switch test box and the operation button are all integrated on a DCS panel, so that the purchasing and daily maintenance costs are reduced; the interfaces related to the liquid level switch test of the DCS system on site are reduced, the site operation is avoided, the information interaction between site operators and main control room personnel during the test period is eliminated, and the time of the periodic test is shortened; the periodic test covers the whole electrical loop from the local liquid level switch to the DCS control system, so that the quality of a liquid level switch contact is verified, whether the actual action set value of the liquid level switch meets the design requirement is accurately verified, and the periodic test verifies that the content is more comprehensive; the liquid level switch periodic test is completed by one-key starting of the main control, the test operation process is simplified, the workload of operators is reduced, the risk of misoperation of the operators is eliminated, and the automation level is obviously improved.
Drawings
FIG. 1 is a schematic diagram of a control system for a periodic test of a nuclear power plant level switch according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a control execution module according to an embodiment of the present invention.
Fig. 3 is another schematic structural diagram of a control execution module according to an embodiment of the present invention.
FIG. 4 is a schematic diagram of a measurement point arrangement of a liquid level switch of a control system for a nuclear power plant liquid level switch periodic test according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a test function of a liquid level switch of a control system for a periodic test of a liquid level switch of a nuclear power plant according to an embodiment of the present invention.
FIG. 6 is an electrical schematic diagram of a control system for periodic testing of a nuclear power plant level switch according to an embodiment of the present invention.
FIG. 7 is a flow chart illustrating the sequential control of the control system for the periodic test of the level switch of the nuclear power plant according to the present invention.
FIG. 8 is a logic diagram of a water injection sub function of a column A of a control system for a nuclear power plant liquid level switch periodic test provided by the invention.
FIG. 9 is a sub-functional diagram of the automatic detection of the test result of the A-column liquid level switch of the control system for the periodic test of the liquid level switch of the nuclear power plant provided by the invention.
Fig. 10 is a flowchart of steps of a control method for a periodic test of a nuclear power plant level switch according to a second embodiment of the present invention.
Detailed Description
The invention aims to solve the technical problems that channel acquisition of a liquid level switch signal in the prior art is firstly acquired by a local test box and then transferred to a DCS system to complete interlocking protection operation, an operation output result is used for controlling a field actuator in an interlocking way, an additional hardware device is needed through physical control, and the selection switch is physically grounded, so that the DCS system is easily damaged, and the invention aims to provide a control system and a control method for a nuclear power plant liquid level switch periodic test, wherein the core idea is as follows: the independent in-situ test box, the indicator lamp, the in-situ test selection hard button and the like in the prior art are connected through hardware, a device for physical control is cancelled, the whole control system is based in a DCS system, and a multi-column redundant liquid level switch design respectively adopts two-out-of-three protection logic, so that the reliability is high, and the normal interlocking protection function of the other column of liquid level switches is effective during the test of the one column of liquid level switches, thereby ensuring the safety of a unit; when one of the liquid level switches is subjected to periodic tests through software control, the test loop and the normal protection loop are controlled to be electrically isolated, and the influence of the periodic test loop fault on the normal protection loop is avoided. The interface is more friendly and more convenient to use by integrating the human-computer interface for the periodic liquid level test on the DCS; whether the liquid level switch is qualified or not is automatically judged according to the actual action value of the liquid level switch, and the corresponding water injection valve and the corresponding isolating valve of each column of the liquid level switch test adopt the electric valves and are brought into DCS control, so that the automatic switching of a water injection loop of the liquid level switch and normal water inflow is realized, and the field water injection operation work and the human errors possibly generated by the field water injection operation work are eliminated.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example one
The embodiment of the invention provides a control system for a nuclear power plant liquid level switch periodic test, referring to fig. 1, fig. 1 is a schematic structural diagram of a control system module of a first embodiment of the invention, and the control system comprises: the starting selection module is used for starting the periodic test of the multi-column liquid level switch assembly and selecting a test column of the corresponding liquid level switch assembly for starting the test; the control execution module is connected with the starting selection module and used for cutting off the selected test column from the DCS protection system and operating the water injection isolation assembly corresponding to the selected test column; and the liquid level switch signal receiving module is respectively connected with the control execution module and the liquid level switch assembly and is used for receiving the liquid level signal of the test column of the selected liquid level switch assembly, transmitting the liquid level signal to the control execution module and outputting a test result. The display module comprises a touch screen area, the starting selection module is arranged in the touch screen area and used for displaying information of the started test columns, displaying a plurality of test columns in the touch screen area, selecting the test columns and displaying test results of the test columns of the liquid level switch assembly correspondingly selected.
Referring to fig. 2 in conjunction with fig. 1, the control execution module specifically includes: the switching module is connected with the starting selection module and is used for cutting off a liquid level switch signal of one test column obtained from the plurality of liquid level switch assemblies from the DCS protection system; and the operation module is connected with the switching module and used for controlling the water injection isolation assembly of the column to be tested, isolating the connection between the liquid level switch assembly of the column to be tested and the water tank and switching on the connection between the liquid level switch assembly of the column to be tested and the water injection port to perform water injection operation. And the operation module is also used for putting the finished test column liquid level switch assembly into the DCS protection system again after the test of the selected test column liquid level switch is finished, cutting off the other non-test column liquid level switch assembly still working from the DCS protection system, isolating the connection between the water tank and the other test column liquid level switch assembly, and switching on the connection between the other liquid level switch assembly and the water injection port to perform water injection operation.
Referring to fig. 3 in combination with fig. 1, the control execution module further includes a calculation module, which is configured to calculate deviations between actual action values of the liquid level switches corresponding to the liquid level switch assemblies and the design fixed values in sequence according to the received liquid level signals of the test columns by using two-out-of-three protection logic, determine whether the deviations exceed the allowable values one by one, and if the deviations exceed the allowable values, determine that the liquid level switches corresponding to the liquid level switch assemblies are faulty and give an alarm.
Further, as shown in fig. 1, the multi-column liquid level switch assembly includes an a-column liquid level switch assembly and a B-column liquid level switch assembly, and the a-column liquid level switch assembly and the B-column liquid level switch assembly are respectively connected to the start selection module and the respective corresponding isolated water injection assemblies; the starting selection module is used for starting the periodic tests of the A-column liquid level switch assembly and the B-column liquid level switch assembly and selecting the A-column liquid level switch assembly as a switch test column at first;
the control execution module is used for controlling and executing the liquid level switch assemblies of the A row and the B row to be sequentially started in sequence, and controlling to cut off the connection between the liquid level switch assembly of the A row and the DCS protection system when the liquid level switch assembly of the A row is tested, namely, when one row of liquid level switches is periodically tested through software control, the control test loop is electrically isolated from the normal protection loop, and the influence of the fault of the periodic test loop on the normal protection loop is avoided. The control execution module is also used for controlling the water injection isolation assembly of the row A to perform water injection operation, and the liquid level switch assembly of the row B is still connected with the DCS protection system to normally monitor the liquid level in the water tank; the liquid level switch signal receiving module is used for receiving the liquid level signals of the A-column test columns, transmitting the liquid level signals of the A-column test columns to the control execution module and outputting the test results of the A-column liquid level switches after water injection; the starting selection module is also used for selectively starting the B-column liquid level switch assembly to test after the A-column liquid level switch assembly is tested, the control execution module is also used for switching the A-column liquid level switch assembly back to the DCS protection system to monitor the liquid level in the water tank, and the B-column liquid level switch assembly is isolated to complete the test of the B-column liquid level switch assembly.
Further, with reference to the schematic diagram of the arrangement of the liquid level switch measuring points in fig. 4, the water injection isolation assembly includes a first water injection isolation valve assembly connected to the liquid level switch assembly in column a, and a second water injection isolation valve assembly connected to the liquid level switch assembly in column B; the first water injection isolation valve component and the second water injection isolation valve component are both connected to the water injection port; one end of the first water injection isolation valve component is connected to the water tank, the other end of the first water injection isolation valve component is connected to the liquid level switch component in the row A, one end of the second water injection isolation valve component is connected to the water tank, and the other end of the second water injection isolation valve component is connected to the liquid level switch component in the row B; when the control execution module carries out liquid level test on the A-row liquid level switch assembly or the B-row liquid level switch assembly, the control execution module correspondingly communicates a pipeline between the A-row liquid level switch assembly or the B-row liquid level switch assembly and a water filling port through isolating the connection of the first water injection isolation valve assembly or the second water injection isolation valve assembly and the water tank, and liquid level test of a test row of the communicated A-row liquid level switch assembly or the B-row liquid level switch assembly is respectively completed.
As can be seen in fig. 4, the first fill isolation valve assembly comprises a fill valve 1, an isolation valve 1 and an isolation valve 2; the second water injection isolation valve component comprises a water injection valve 2, an isolation valve 3 and an isolation valve 4; the A-column liquid level switch assembly comprises an A-column balance container, an A-column measuring cylinder connected with the A-column balance container, three A-column liquid level switches (001SN, 002SN and 003SN) arranged on the A-column measuring cylinder, an A-column liquid level meter 001LN and an A-column liquid level transmitter 001 MN; the B-column liquid level switch assembly comprises a B-column balance container, a B-column measuring cylinder connected with the B-column balance container, three B-column liquid level switches (004SN, 005SN and 006SN) arranged on the B-column measuring cylinder, a B-column liquid level meter 002LN and a B-column liquid level transmitter 002 MN; the both ends of isolation valve 1 and isolation valve 2 are connected to respectively the upper and lower both ends of water tank and A row balance container, the both ends of isolation valve 3 and isolation valve 4 are connected to the upper and lower both ends of water tank and B row balance container respectively, 1 one end of water injection valve is connected to the water filling port, 1 other end of water injection valve is connected to isolation valve 1, 2 one end of water injection valve is connected to the water filling port, 2 other ends of water injection valve are connected to isolation valve 3, control the pipeline break-make between water tank and liquid level switch subassembly through opening and closing the water injection valve that corresponds respectively, carry out the test that corresponds liquid level switch respectively.
Furthermore, referring to fig. 4, two rows of a/B of two redundant measurement cylinders are designed, each measurement cylinder is respectively provided with three liquid level switches, the liquid level switches 001SN/002SN/003SN are installed on the row a of measurement cylinders, the liquid level switches 004SN/005SN/006SN are installed on the row B of measurement cylinders, the row a/B of liquid level switches respectively adopt a protection logic of taking two out of three, that is, the deviation between the actual action value and the designed fixed value of the liquid level switch corresponding to the liquid level switch assembly is sequentially calculated according to the received three liquid level switch signals of each row, whether the deviation exceeds the allowable value is judged one by one, and if the deviation exceeds the allowable value, the liquid level switch corresponding to the liquid level switch assembly is triggered to give an alarm. The A/B column two measuring cylinders are respectively provided with different isolating valves, the two measuring cylinders can be isolated independently through the corresponding isolating valves, the in-situ liquid level meter 001LN/002LN is respectively used for in-situ observation of the water level of the A/B column measuring cylinders, the liquid level transmitter 001MN/002MN is collected into the DCS system and used for remote real-time monitoring of the water tank liquid level of the DCS system, meanwhile, the liquid level measurement value at the action moment of the liquid level switch can be recorded, and the arrangement diagram of the liquid level switch measuring points is shown in figure 4. The best embodiment of the invention is as follows: the lower isolating valve 1 and the water injection valve 1 of the A-column measuring cylinder and the lower isolating valve 3 and the water injection valve 2 of the B-column measuring cylinder adopt electric valves and are remotely controlled by a DCS (distributed control system), the upper isolating valve 2 of the A-column measuring cylinder and the upper isolating valve 4 of the B-column measuring cylinder are manual valves, an operator manually opens the valves according to actual conditions on site, and the normally open positions are kept during normal operation and testing.
Further, the schematic diagram of the liquid level switch test function structure shown in fig. 5 is combined, all the modules of the control system are integrated in the DCS system, the DCS system is respectively connected with the liquid level switch (column a) and the liquid level switch (column B), the column a and the column B liquid level transmitters 001MN and 002MN are simultaneously connected to the DCS system, the DCS system sends start and stop signals to the field actuator according to the generated signals, and controls the isolation valve and the water injection valve to be opened and closed after the operation logic of one layer of the DCS system is judged. On a DCS display screen of a DCS system, the area comprises a periodic test starting area 001KG used for selectively starting the liquid level switch assemblies of the A or B columns, and test indicator lamps of three liquid level switches of the A column and test indicator lamps of three liquid level switches of the B column are respectively arranged in the test structure automatic indicating area, so that a test is effectively indicated according to a test judgment result; the liquid level monitoring system also comprises a liquid level continuous monitoring area, and the liquid levels are correspondingly displayed on a display interface for effective monitoring through the A-column liquid level transmitters 001MN and the B-column liquid level transmitters 002 MN. That is, the DCS screen is designed with three areas: a periodic test starting command area (001KG), a liquid level continuous monitoring area (001MN/002MN) and a periodic test result monitoring display area. The periodic test logic and the interlocking protection logic of the liquid level switch are realized in DCS system software, and an on-site test box, a test selection switch CC, a liquid level indicator lamp LA and a lamp test button TO are not arranged. The liquid level switches on the A-column measuring cylinder and the B-column measuring cylinder are tested regularly according to columns, the A-column liquid level switches and the B-column liquid level switches are redundant and standby, when a certain column of liquid level switches is tested regularly, the interlocking protection function of the liquid level switches is temporarily unavailable, but the interlocking protection function of the liquid level switches of the other column of liquid level switches in a non-testing state is still available. The periodic test function is completed by using a DCS sequential control program, so that the periodic test of the liquid level switch can be completed by starting the main control chamber by one key, and a worker is not required to participate in the periodic test operation on site. The detailed results of the periodic test can be automatically displayed through a test result display area: if the test results are all qualified, the normal water inlet loop of the liquid level switch can be automatically switched after the test is finished. If the test result of the liquid level switch is unqualified, the normal water inlet loop of the liquid level switch is automatically kept in an isolated state, an operator informs maintenance personnel to maintain according to the prompt of test faults, and the periodic test is carried out again after the maintenance is finished until the test is passed.
The electrical schematic diagram of the invention is shown in the attached figure 6, wherein the liquid level switch 001SN/002SN/003SN/004SN/005SN/006SN contact is directly collected by a DI channel of a DCS through a switching value input point signal, the liquid level switch signal has no intermediate switching link, and the signal collection does not depend on the state of a field test switch any more. The liquid level transmitter 001MN/002MN is collected by an AI channel of the DCS system, participates in the continuous monitoring control of the DCS system on the liquid level, and can record the liquid level value at the moment of the action of the liquid level switch, namely the actual action fixed value of the liquid level switch. The protection circuit and the periodic test circuit related to the liquid level switch are isolated in DCS software, so that the problem that the control of the other circuit fails due to the electrical fault of one circuit can be avoided. The lower isolation valve 1 and the water injection valve 1 of the A-column measuring cylinder and the lower isolation valve 3 and the water injection valve 2 of the B-column measuring cylinder are on/off electric valves and are remotely controlled by a DCS (distributed control System), and the DCS completes automatic switching between a normal water inlet loop and a test water inlet loop of a liquid level switch through the isolation valves and the water injection valves. The collected voltages of the liquid level switch and the liquid level transmitter are provided by the DCS system so as to reduce interfaces with an external power supply system as much as possible.
In the sequence control program for the periodic test of the liquid level switch designed in the first embodiment of the invention, the operation is completed by DCS software, the periodic test of the liquid level is started by one key in the main control chamber, the image of the DCS terminal can automatically display the test result, and an operator judges whether to inform maintenance personnel to overhaul the liquid level switch according to the prompt of the test result, so that the operation flow of the periodic test is greatly simplified, and the detailed sequence control flow is shown in FIG. 7. An operator manually starts a periodic test command, a periodic test of the A-column switch is started, a protection loop of the A-column switch is automatically cut off, the A-column measuring cylinder automatically completes external water injection, the action condition of the A-column switch 001SN/002SN/003SN is automatically monitored during water injection, the test result of the A-column switch is automatically identified, if a fault occurs, the operator is prompted, if the fault does not exist, the A-column switch is recovered to normally feed water, then a test subprogram of the B-column switch is entered, and after the test of the B-column switch is completed, the sequence control program is automatically exited.
The sequential control program comprises four sub-functions of water injection of the A/B measuring cylinder and automatic detection of test results, wherein the control schemes of the sub-functions of the A-column liquid level switch and the B-column liquid level switch are completely the same, so the scheme is described by taking the sub-functions of the A-column switch as an example, the logic of the water injection sub-function of the A-column measuring cylinder is shown in figure 8, the DCS automatically closes the isolation valve 1 at the lower part of the measuring cylinder and opens the water injection valve 1 to start water injection, the DCS continuously monitors the 001MN liquid level measurement value, and when the water injection liquid level reaches a preset value, the water injection valve is automatically closed to stop water injection.
The detail of the automatic detection subfunction of the A-column liquid level switch test result is shown in FIG. 9, DCS is adopted to automatically monitor the action condition of the liquid level switch in the embodiment, the deviation between the actual action value of the liquid level switch and the designed fixed value is calculated, whether the deviation exceeds the allowable value is automatically judged, and the problems of large test error and large risk of human error existing in the past depending on naked eye observation are solved. Detailed scheme of automatic detection of subfunction of test results: continuously monitoring the action condition of the A-column liquid level switch 001SN/002SN/003SN through a DCS (computer control System) during the test, recording the measured value of 001MN at the moment once the liquid level switch acts, taking the value as the actual action value of the liquid level switch, comparing the actual action value with the designed fixed value of the corresponding liquid level switch to obtain a deviation value, and if the deviation value is within an allowable range, then obtaining the deviation valueThe liquid level switch passes the test, if the deviation value exceeds the allowable range, the liquid level switch is sent out＊＊＊SN out-of-tolerance prompt, if a certain liquid level switch fails to act all the time in the test process, the SN out-of-tolerance prompt can send out the SN out-of-tolerance prompt＊＊＊SN refusing action prompt, when the action conditions of the A column liquid level switch are all normal, the A column liquid level switch sends out that the regular test of the A column liquid level switch passes.
In the first embodiment of the invention, because the A/B two rows of redundant liquid level switches are arranged, the protection logic of taking three out of two is adopted respectively, the reliability is high, during the test of one row of liquid level switches, the interlocking protection function of the other row of liquid level switches is still effective, the normal operation of a unit is not influenced, and the safe operation of the unit is facilitated; the liquid level switch test loop is not electrically connected with the normal protection loop, and the electrical fault of the test loop cannot cause the fault of the normal protection loop, so that the safe operation of the unit is facilitated; because a local liquid level switch test box and an operation button are omitted, the purchasing and daily maintenance costs are reduced; the interfaces related to the liquid level switch test of the DCS system on site are reduced, the site operation is avoided, the information interaction between site operators and main control room personnel during the test period is eliminated, and the time of the periodic test is shortened; the periodic test covers the whole electrical loop from the local liquid level switch to the DCS control system, so that the quality of a liquid level switch contact is verified, whether the actual action set value of the liquid level switch meets the design requirement is accurately verified, and the periodic test verifies that the content is more comprehensive; the liquid level switch periodic test is completed by one-key starting of the main control, the test operation process is simplified, the workload of operators is reduced, the risk of misoperation of the operators is eliminated, and the automation level is obviously improved.
Example two
The implementation of the invention provides a control method for a periodic test of a liquid level switch of a nuclear power plant, which is suitable for a control system for the periodic test of the liquid level switch of the nuclear power plant shown in the first embodiment, and referring to fig. 10, the method comprises the following steps:
s100, starting a regular test of the multi-column liquid level switch assembly and selecting a test column of the corresponding liquid level switch assembly for starting the test;
s200, cutting off a liquid level switch signal of one test column obtained from the plurality of columns of liquid level switch assemblies from a DCS protection system, controlling a water injection isolation assembly of the column to be tested, isolating the connection between the liquid level switch assembly of the column to be tested and a water tank, and connecting the connection between the liquid level switch assembly of the column to be tested and a water injection port to perform water injection operation;
s300, receiving a liquid level signal of the test column of the selected liquid level switch assembly, transmitting the liquid level signal to the control execution module and outputting a test result.
Further, the method further comprises: after the selected test column liquid level switch is tested, putting the tested test column liquid level switch assembly into the DCS protection system again, cutting off the other non-test column liquid level switch assembly still working from the DCS protection system, isolating the connection between the water tank and the other test column liquid level switch assembly, and switching on the connection between the other liquid level switch assembly and the water injection port to perform water injection operation; and according to the received liquid level signals of the test columns, adopting a three-out-of-two protection logic, sequentially calculating the deviation between the actual action value and the designed fixed value of the liquid level switch of the corresponding liquid level switch assembly, judging whether the deviation exceeds an allowable value one by one, and if the deviation exceeds the allowable value, triggering the fault signals of the liquid level switch of the corresponding liquid level switch assembly and giving an alarm.
The periodic test of the liquid level switch in the embodiment of the invention is automatically completed by one-key starting of an operator in a main control room without operating equipment on site by the operator, and the simplified test steps comprise the following steps: a main control operator presses a periodic test starting command 001KG on a DCS picture; the method comprises the following steps that a regular test sequence control program of a liquid level switch is automatically operated, a DCS screen automatically displays regular test results of the A/B-column liquid level switch, and an operator determines whether to inform maintenance personnel to overhaul according to the test results; the periodic test was automatically terminated and automatically grayed back to the pre-test state.
The present invention provides a computer-readable storage medium storing a computer program which, when executed by a control system, performs the steps of: s100, starting a regular test of the multi-column liquid level switch assembly and selecting a test column of the corresponding liquid level switch assembly for starting the test; s200, cutting off a liquid level switch signal of one test column obtained from the plurality of columns of liquid level switch assemblies from a DCS protection system, controlling a water injection isolation assembly of the column to be tested, isolating the connection between the liquid level switch assembly of the column to be tested and a water tank, and connecting the connection between the liquid level switch assembly of the column to be tested and a water injection port to perform water injection operation; and step S300, receiving a liquid level signal of the test column of the selected liquid level switch assembly, transmitting the liquid level signal to the control execution module and outputting a test result.
In the computer-readable storage medium, a control system integrated in the DCS system is used for cutting off a liquid level switch signal of one test column obtained from a plurality of columns of liquid level switch assemblies from the DCS protection system; and controlling the water injection isolation assembly of the column to be tested, isolating the connection between the liquid level switch assembly of the column to be tested and the water tank, and switching on the connection between the liquid level switch assembly of the column to be tested and the water injection port to perform water injection operation. (ii) a After the selected test column liquid level switch is tested, putting the tested test column liquid level switch assembly into the DCS protection system again, cutting off the other non-test column liquid level switch assembly still working from the DCS protection system, isolating the connection between the water tank and the other test column liquid level switch assembly, and switching on the connection between the other liquid level switch assembly and the water injection port to perform water injection operation; and according to the received liquid level signals of the test columns, adopting a three-out-of-two protection logic, sequentially calculating the deviation between the actual action value and the designed fixed value of the liquid level switch of the corresponding liquid level switch assembly, judging whether the deviation exceeds an allowable value one by one, and if the deviation exceeds the allowable value, triggering the fault signals of the liquid level switch of the corresponding liquid level switch assembly and giving an alarm.
It should be noted that the control system, the control method and the storage medium for the periodic test of the nuclear power plant liquid level switch belong to the same inventive concept. It will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by a computer program, which is stored in a non-volatile computer readable storage medium and can include the processes of the above embodiments of the methods when the program is executed. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM). The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In conclusion, the design of the A/B two-column redundant liquid level switch respectively adopts two-out-of-three protection logic, the reliability is high, and the normal interlocking protection function of the liquid level switch is effective during the test of the liquid level switch, so that the safe and stable operation of a unit is ensured; an on-site liquid level switch test box is omitted, and engineering and daily maintenance costs are reduced; the local test is cancelled to select a hard button, so that the fault of the interlocking control of the control system caused by the contact fault of the hard button is avoided; the isolation between the periodic test loop and the normal protection loop of the liquid level switch is realized through software, so that the influence of the fault of the periodic test loop on the normal protection loop is avoided; the friendly man-machine interface for the liquid level periodic test realizes one-key starting and automatic completion of the periodic test of the liquid level switch by adopting a sequential control program, has high automation degree and reduces the burden of operators; the automatic judgment logic for whether the actual action value of the liquid level switch is qualified or not in the automatic subfunction of the test result of the liquid level switch; the water injection valve and the isolation valve in the liquid level switch test adopt electric valves and are controlled by the DCS, so that the automatic switching of a water injection loop of the liquid level switch and normal water inflow is realized, and the field water injection operation work and the human errors possibly caused by the field water injection operation work are eliminated.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. The utility model provides a control system of nuclear power plant's liquid level switch periodic test, a serial communication port, control system is integrated in the DCS system for test multiseriate liquid level switch subassembly, multiseriate liquid level switch subassembly are connected with DCS protection system respectively, control system includes:
the starting selection module is used for starting the periodic test of the multi-column liquid level switch assembly and selecting a test column corresponding to the liquid level switch assembly;
the control execution module is connected with the starting selection module and used for cutting off the selected test column from the DCS protection system and operating the water injection isolation assembly correspondingly connected with the selected test column;
the liquid level switch signal receiving module is respectively connected with the control execution module and the liquid level switch assembly and is used for receiving a liquid level signal of a test column of the selected liquid level switch assembly, transmitting the liquid level signal to the control execution module and outputting a test result;
the control execution module includes:
the switching module is connected with the starting selection module and is used for cutting off a liquid level switch signal of one test column in the multi-column liquid level switch assembly from the DCS protection system;
the operation module is connected with the switching module and the isolation water injection assembly and is used for controlling the water injection isolation assembly of the selected test column, isolating the connection between the liquid level switch assembly of the selected test column and the water tank and switching on a pipeline between the liquid level switch assembly of the selected test column and the water injection port to perform water injection operation;
the operation module is also used for putting the tested corresponding liquid level switch assembly into the DCS protection system again after the test of the selected test column liquid level switch is completed, and cutting off and switching another column of liquid level switch assemblies in a non-test state from the DCS protection system to a test state: meanwhile, isolating a pipeline between the water tank and the test column liquid level switch assembly, and connecting the pipeline between the test column liquid level switch assembly and the water injection port to finish water injection operation;
the control execution module further includes: and the calculation module is used for sequentially calculating the deviation between the actual action value and the designed fixed value of the liquid level switch of the corresponding liquid level switch assembly by adopting a three-out-of-two protection logic according to the received liquid level signal of the test column, judging whether the deviation exceeds an allowable value one by one, and triggering a liquid level switch fault signal of the corresponding liquid level switch assembly and giving an alarm if the deviation exceeds the allowable value.
2. The control system of claim 1, wherein the multi-column level switch assembly comprises column a and column B level switch assemblies, the column a and column B level switch assemblies being respectively connected to the actuation selection module;
the starting selection module is used for starting the periodic tests of the liquid level switch assemblies of the A column and the B column and selecting the liquid level switch assembly of the A column as a switch test column at first;
the control execution module is used for controlling the liquid level switch assemblies for executing the A-column and the B-column to be sequentially started, cutting off the connection between the A-column liquid level switch assemblies and the DCS protection system when the A-column liquid level switch assembly test is executed, controlling the A-column water injection isolation assembly to complete water injection operation, and simultaneously keeping the B-column liquid level switch assemblies still connected with the DCS protection system and normally monitoring the liquid level in the water tank;
the liquid level switch signal receiving module is used for receiving liquid level signals of the A-column test columns, transmitting the liquid level signals of the A-column test columns to the control execution module and outputting test results of the A-column liquid level switches after water injection;
the starting selection module is further used for automatically selecting and starting the B-column liquid level switch assembly for testing after the A-column liquid level switch assembly is tested, the control execution module is further used for putting the A-column liquid level switch assembly into the DCS protection system again for monitoring the liquid level of the water tank, and then isolating the B-column liquid level switch assembly to be connected with the water tank and completing the test of the B-column liquid level switch assembly.
3. The control system of claim 2, wherein the waterflood isolation assembly comprises a first waterflood isolation valve assembly coupled to a column a level switch assembly, and a second waterflood isolation valve assembly coupled to a column B level switch assembly; the first water injection isolation valve assembly and the second water injection isolation valve assembly are both connected to a water injection port;
one end of the first water filling isolation valve assembly is connected to the water tank, the other end of the first water filling isolation valve assembly is connected to the liquid level switch assembly in the column A, one end of the second water filling isolation valve assembly is connected to the water tank, and the other end of the second water filling isolation valve assembly is connected to the liquid level switch assembly in the column B;
the control execution module is also used for carrying out liquid level test on the A-row or B-row liquid level switch assembly, correspondingly communicating the A-row liquid level switch assembly or the B-row liquid level switch assembly with a pipeline between the water filling ports through isolation, and respectively completing the liquid level test of the communicated A-row liquid level switch assembly or B-row liquid level switch assembly.
4. The control system of claim 3, wherein the first fill isolation valve assembly comprises a first fill valve, a first isolation valve, and a second isolation valve; the second water injection isolation valve assembly comprises a second water injection valve, a third isolation valve and a fourth isolation valve;
the A-column liquid level switch assembly comprises an A-column balance container, an A-column measuring cylinder connected with the A-column balance container, three A-column liquid level switches arranged on the A-column measuring cylinder, an A-column liquid level meter and an A-column liquid level transmitter;
the B-column liquid level switch assembly comprises a B-column balance container, a B-column measuring cylinder connected with the B-column balance container, three B-column liquid level switches arranged on the B-column measuring cylinder, a B-column liquid level meter and a B-column liquid level transmitter;
the two ends of the first isolation valve and the second isolation valve are respectively connected to the upper end and the lower end of the water tank and the A-line balance container, the two ends of the third isolation valve and the fourth isolation valve are respectively connected to the upper end and the lower end of the water tank and the B-line balance container, one end of the first water injection valve is connected to the water injection port, the other end of the first water injection valve is connected to the first isolation valve, one end of the second water injection valve is connected to the water injection port, the other end of the second water injection valve is connected to the third isolation valve, and the corresponding water injection valve and the isolation valve are respectively opened and closed to control the on-off of a pipeline between the water tank and the liquid level switch assembly so as to respectively perform tests corresponding to the liquid level switch.
5. The control system according to claim 1, further comprising a display module, wherein the display module comprises a touch screen area, the start selection module is arranged in the touch screen area and used for displaying information of the started test columns, displaying a plurality of test columns in the touch screen area, selecting the test columns, and displaying the test result corresponding to the selected test column of the liquid level switch assembly.
6. A method of controlling periodic testing of a nuclear power plant level switch using a control system according to any one of claims 1 to 5, the method comprising the steps of:
starting a periodic test of a plurality of columns of liquid level switch assemblies and selecting a test column of the corresponding liquid level switch assembly for starting the test;
cutting off a liquid level switch signal of one test column in the liquid level switch assemblies from the DCS protection system, controlling a water injection isolation assembly of the to-be-tested column, isolating the connection between the liquid level switch assembly of the to-be-tested column and the water tank, and switching on a pipeline between the liquid level switch assembly of the to-be-tested column and a water injection port to finish water injection operation;
and receiving a liquid level signal of the test column of the selected liquid level switch assembly, transmitting the liquid level signal to the control execution module and outputting a test result.
7. The control method according to claim 6, characterized in that the method further comprises: after the test of the selected test column liquid level switch is completed, putting the corresponding column liquid level switch assembly which has completed the test into the DCS protection system again, and cutting off and switching another column of liquid level switch assemblies in a non-test state from the DCS protection system to a test state: isolating a pipeline between the water tank and the test column liquid level switch assembly, and connecting the pipeline between the test column liquid level switch assembly and the water injection port to finish water injection operation;
and according to the received liquid level signals of the test columns, adopting a three-out-of-two protection logic, sequentially calculating the deviation between the actual action value and the designed fixed value of the liquid level switch of the corresponding liquid level switch assembly, judging whether the deviation exceeds an allowable value one by one, and if the deviation exceeds the allowable value, triggering the fault signals of the liquid level switch of the corresponding liquid level switch assembly and giving an alarm.
8. A computer-readable storage medium, characterized in that a computer program is stored which, when being executed by a control system, carries out the steps of the method according to any one of claims 6-7.
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