阅读说明：本技术 核电厂液位开关定期试验控制系统、控制方法和存储介质 (Nuclear power plant liquid level switch periodic test control system, control method and storage medium ) 是由 尹刚 曾彬 顾凯 张冲 顾珊珊 于 2019-10-23 设计创作，主要内容包括：本发明提供核电厂液位开关定期试验的控制系统,方法和存储介质,包括启动多列液位开关组件的定期试验以及选择对应液位开关试验的启动选择模块；将被选择的试验列从DCS保护系统中切断,并对被选择试验列对应注水隔离组件进行操作的控制执行模块；接收已选择液位开关组件的试验列的液位信号,并将液位信号传输至控制执行模块并将试验结果输出至液位开关信号接收模块；本发明通过将控制系统各模块集成在DCS系统内,在试验时仅需将试验列的液位开关信号从DCS保护系统中切断,非试验列的液位开关组件仍正常参与保护,解决了现有技术中需要通过额外的硬件实现控制的缺陷以及现有技术易存在设备故障引发DCS保护系统误动作的技术问题,有利于机组的安全运行。(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.)

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;

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.

2. The control system of claim 1, wherein the control execution module comprises:

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;

and 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.

3. The control system of claim 2, wherein the operating module is further configured to, after the selected test column level switch is tested, drop the corresponding column level switch assembly that has been tested into the DCS protection system again, and disconnect and switch another column of level switch assemblies in a non-test state from the DCS protection system to a test state: and meanwhile, isolating the 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.

4. The control system of claim 3, 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.

5. 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.

6. The control system of claim 5, 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.

7. The control system of claim 6, wherein the first water injection isolation valve assembly comprises a water injection 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 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 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 respectively the upper and lower both ends of water tank and B row balance container, water injection valve (1) one end is connected to the water filling port, the water injection valve (1) other end is connected to isolation valve (1), water injection valve (2) one end is connected to the water filling port, the water injection valve (2) other end is connected to isolation valve (3) are respectively through opening and closing corresponding water injection valve and isolation valve control the pipeline break-make between water tank and liquid level switch subassembly carries out the test that corresponds liquid level switch respectively.

8. 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.

9. 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 8, 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.

10. The control method according to claim 9, 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.

11. 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 9-10.

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.

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.