CN208333596U - Device and system for the judgement of liquid level of steam drum relay protective scheme - Google Patents
Device and system for the judgement of liquid level of steam drum relay protective scheme Download PDFInfo
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- CN208333596U CN208333596U CN201820786161.1U CN201820786161U CN208333596U CN 208333596 U CN208333596 U CN 208333596U CN 201820786161 U CN201820786161 U CN 201820786161U CN 208333596 U CN208333596 U CN 208333596U
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- 239000007788 liquid Substances 0.000 title claims abstract description 227
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Abstract
The utility model embodiment provides a kind of device and system for the judgement of liquid level of steam drum relay protective scheme, belongs to power domain.Whether described device includes: the judgment module connecting with for detecting the transmitter of liquid level of steam drum, and the judgment module receives the liquid level signal from the transmitter, normal for judging the liquid level signal, and exports judging result；And the first determining module connecting with the judgment module and the transmitter, first determining module are based on the judging result and the liquid level signal, it is determined whether carry out liquid level of steam drum protection, and export definitive result.The application above scheme is referred to the whether normal Rule of judgment of liquid level signal.When liquid level signal exception, due to introducing the Rule of judgment to liquid level signal, the malfunction that not will lead to liquid level protection ensure that the safe and stable operation of boiler system to improve the accuracy of liquid level protection act.
Description
Technical field
The present invention relates to power domains, more particularly to a kind of device for the judgement of liquid level of steam drum relay protective scheme and are
System.
Background technique
The liquid level of steam drum relay protective scheme of existing boiler is the liquid level of steam drum letter issued according to three transmitters independently measured
Number, after during three take preferentially, then trip rating low with the high trip rating of liquid level and liquid level compares, it is determined whether carries out boiler liquid
Position MFT (Main Fuel Trip, main fuel trip) is protected.But existing liquid level of steam drum relay protective scheme does not account for liquid level of steam drum
Whether signal is normal signal, and also without introducing relative alarm mechanism, therefore after transmitter failure, will affect protection and patrol
The judgement of the regular event and operations staff collected, there are security risks.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, the purpose of the embodiment of the present invention is that providing a kind of for drum
The device and system of liquid level relay protective scheme judgement.
To achieve the goals above, the embodiment of the present invention provides a kind of device for the judgement of liquid level of steam drum relay protective scheme,
Described device includes: the judgment module connecting with for detecting the transmitter of liquid level of steam drum, and the judgment module, which receives, comes from institute
The liquid level signal for stating transmitter, it is whether normal for judging the liquid level signal, and export judging result；And with the judgement mould
The first determining module that block is connected with the transmitter, first determining module is based on the judging result and the liquid level is believed
Number, it is determined whether liquid level of steam drum protection is carried out, and exports definitive result.
Optionally, the judgment module includes the first threshold cells, and first threshold cells are for believing the liquid level
The level value of number instruction is compared with the first preset range, described when the level value is beyond first preset range
The signal of first threshold cells output instruction level value exception, the judging result is that liquid level signal is abnormal, when the level value
When without departing from first preset range, the first threshold cells output instruction normal signal of level value, the judgement knot
Fruit is that liquid level signal is normal.
Optionally, the judgment module also receives the level gauging access detection signal from dcs, institute
State level gauging access detection signal be used to indicate the transmitter level gauging channel it is whether normal, when the level gauging
Access detection signal indicates that the level gauging channel is normal and the first threshold cells output instruction level value is normal
In the case where signal, the judging result is that liquid level signal is normal.
Optionally, first determining module includes the second threshold cells, and second threshold cells are used for the liquid
The level value of position signal designation is compared with the second preset range, and exports the signal of instruction comparison result, and described first really
Signal and the judging result of the cover half block based on the instruction comparison result, it is determined whether carry out liquid level of steam drum protection.
Optionally, second threshold cells include the first limit value block and the second limit value block, and the first limit value block is used for
The level value is compared with liquid level upper limit value, and when the level value is higher than the liquid level upper limit value, output instruction
The excessively high signal of liquid level of steam drum, the second limit value block are used to for the level value being compared with bottom level limit, and in institute
When stating level value lower than the bottom level limit, and export the too low signal of instruction liquid level of steam drum.
Optionally, the definitive result include carry out the protection of liquid level of steam drum height, carry out liquid level of steam drum minimum living shield and not into
Row liquid level protection, wherein when the judging result is that liquid level signal is normal, and the first limit value block exports the instruction
When the excessively high signal of liquid level of steam drum, the definitive result of output is to carry out the protection of liquid level of steam drum height；It is in the judging result
When liquid level signal is normal, and when the second limit value block exports the instruction liquid level of steam drum too low signal, output it is described
Definitive result is to carry out liquid level of steam drum minimum living shield；Otherwise, the definitive result of output is to protect without liquid level.
On the other hand, the embodiment of the present application also provides a kind of system for the judgement of liquid level of steam drum relay protective scheme, the system
System includes: multiple above-mentioned devices for the judgement of liquid level of steam drum relay protective scheme, and each described device is used for its corresponding change
Whether the liquid level signal for sending device to issue is normally carried out judgement, and exports definitive result according to judging result and the liquid level signal；
And second determining module, for the judging result and the definitive result according to multiple described devices, it is determined whether into
The protection of row liquid level of steam drum.
Optionally, when being detected by three transmitters to liquid level of steam drum, the system comprises three described devices,
Second determining module carries out liquid level of steam drum protection for determining in a case where: the liquid level that three transmitters issue
Signal is all normal and is true to the result of definitive result progress two from three logical operation；And three transmitters issue
Liquid level signal at least one is abnormal and carry out to the definitive result or the result of logical operation is true.
Optionally, second determining module further includes delay unit, for true to being used in second determining module
The fixed output signal for whether carrying out liquid level of steam drum protection is detected, and is detecting the output signal maintenance preset duration
When, determine that the output signal is effective.
Optionally, the system also includes alarm modules, judgment module and second determining module with described device
Connection, wherein when the judgment module judges the liquid level signal exception that its corresponding described transmitter issues, to the alarm
Module sends alarm signal, the alarm module alarm；And liquid level of steam drum protection is carried out when second determining module determines
When, alarm signal, the alarm module alarm are sent to the alarm module.
The application above scheme is referred to the whether normal Rule of judgment of liquid level signal.When liquid level signal exception, by
In introducing the Rule of judgment to liquid level signal, therefore the malfunction of liquid level protection is not will lead to, to improve liquid level protection
Accuracy of action ensure that the safe and stable operation of boiler system.
The other feature and advantage of the embodiment of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Attached drawing is to further understand for providing to the embodiment of the present invention, and constitute part of specification, under
The specific embodiment in face is used to explain the present invention embodiment together, but does not constitute the limitation to the embodiment of the present invention.Attached
In figure:
Fig. 1 is the block diagram for the device for the judgement of liquid level of steam drum relay protective scheme that a kind of embodiment of the application provides；
Fig. 2 is the logic diagram for the judgment module that a kind of optional embodiment of the application provides；
Fig. 3 is the logic diagram for the judgment module that a kind of preferred embodiment of the application provides；
Fig. 4 is the logic diagram for the first determining module that a kind of optional embodiment of the application provides；And
Fig. 5 and Fig. 6 is the logic diagram for the second determining module that a kind of optional embodiment of the application provides.
Description of symbols
100 judgment module, 200 first determining module
110 first threshold cells, 210 second threshold cells
111,112,211,212 limit value block
301,302,303,313,321 NOT gate
113,309,312,317,320 or door
314,322 delay unit
307,315 two from three logical unit
304,305,306,308,310,311,316,318,319 and door
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the embodiment of the present invention.It should be understood that this
Locate described specific embodiment and be merely to illustrate and explain the present invention embodiment, is not intended to restrict the invention embodiment.
Fig. 1 is the block diagram for the device for the judgement of liquid level of steam drum relay protective scheme that a kind of embodiment of the application provides.Such as
Shown in Fig. 1, the application embodiment provides a kind of device for the judgement of liquid level of steam drum relay protective scheme, and described device includes judgement
Module 100 and the first determining module 200.
Judgment module 100 is connect with the transmitter for detecting liquid level of steam drum, which, which receives, comes from the change
The liquid level signal for sending device, it is whether normal for judging the liquid level signal, and export judging result.Wherein, judge that liquid level signal is
It is no just to refer to judge whether the liquid level signal indicates actual level condition in drum.If judging, the liquid level signal can be indicated
Actual level condition in drum, then judging result is that the liquid level signal is normal；If judging, the liquid level signal cannot indicate drum
Interior actual level condition, then judging result is that the liquid level signal is abnormal.
First determining module 200 is connect with judgment module 100 and transmitter, which is based on judgement knot
Fruit and liquid level signal, it is determined whether carry out liquid level of steam drum protection, and export definitive result.
In the application, judgment module 100 receives the liquid level signal from transmitter, judges whether the liquid level signal is normal,
And export judging result.First determining module 200 receives the liquid level signal from transmitter and the judgement from judgment module 100
As a result.When it is normal that judging result, which is the liquid level signal, determine whether liquid level of steam drum is more than normal level based on liquid level signal
Range, and then determine whether to carry out liquid level protection；When judging result is the liquid level signal exception, even if the liquid level signal shows
Liquid level of steam drum is more than normal level range, is also protected without liquid level, can remind operation by triggering alarm mechanism at this time
Personnel check the components such as transmitter.
The application above scheme is referred to the whether normal Rule of judgment of liquid level signal.When due to transmitter appearance event
There is situations such as abnormal in the level gauging channel of barrier or transmitter, when leading to liquid level signal exception, due to introducing to liquid level
The Rule of judgment of signal, therefore not will lead to the malfunction of liquid level protection, to improve the accuracy of liquid level protection act, protect
The safe and stable operation of boiler system is demonstrate,proved.
In a kind of optional embodiment of the application, judgment module 100 includes the first threshold cells, first threshold cells
For the level value of the liquid level signal instruction from transmitter to be compared with the first preset range, the first preset range root
It is set according to the actual conditions of drum and transmitter, so that under normal circumstances, liquid level of steam drum value is first default without departing from this
Range.Therefore, when the level value of liquid level signal instruction exceeds first preset range, it is believed that liquid level signal is abnormal, the
The signal of one threshold cells output instruction level value exception, judging result are that liquid level signal is abnormal；When level value is without departing from first
When preset range, it is believed that liquid level signal is normal, the first threshold cells output instruction normal signal of level value, judging result
It is normal for liquid level signal.
Fig. 2 is the logic diagram for the judgment module that a kind of optional embodiment of the application provides.As shown in Fig. 2, in this Shen
Please be in a kind of optional embodiment, the first threshold cells 110 include two limit value blocks 111,112 and/or door 113, limit value block 111
It is respectively used to compare the upper limit value and lower limit value of level value and the first preset range that liquid level signal indicates with limit value block 112
Compared with wherein the first preset range can be, for example, less than or equal to+500mm and to be more than or equal to -500mm.In the present embodiment,
Liquid level signal from transmitter is input to limited block 111 and limited block 112, when the level value of liquid level signal instruction is greater than the
When the upper limit value of one preset range, limited block 111 exports high level, when the level value of liquid level signal instruction is less than the first default model
When the upper limit value enclosed, limited block 111 exports low level；When lower limit of the level value that liquid level signal indicates less than the first preset range
When value, limited block 112 exports high level, when the level value of liquid level signal instruction is greater than the lower limit value of the first preset range, limit
Position block 112 exports low level.The output of limited block 111 and limited block 112 is connected to or door 113 or door 113 export two-way letter
Number, the first output signal respectively directly exported and the second output signal exported by NOT gate 301.
As shown in Figure 2, when the level value of liquid level signal instruction is greater than the upper limit value of the first preset range or less than first
When the lower limit value (exceeding the first preset range) of preset range, the first output signal is high level, and the second output signal is low
Level shows that liquid level signal is abnormal (i.e. judging result is that liquid level signal is abnormal)；When liquid level signal instruction level value without departing from
When the first preset range, the first output signal is low level, and the second output signal is high level, shows that liquid level signal is normal (i.e.
Judging result is that liquid level signal is normal).Wherein, the first output signal can be output to alarm module (not shown), in liquid level
Alarm module alarm is triggered when abnormal signal, which can issue to operator station and alarm, and can be by man-machine
Interface display warning message, the warning message can for example including the transmitter location information etc. for issuing abnormal liquid level signal, with
It is overhauled convenient for operations staff；Second output signal can be output to the first determining module 200, determine for determining module
Whether liquid level of steam drum protection is carried out.
Fig. 3 is the logic diagram for the judgment module that a kind of preferred embodiment of the application provides.As shown in figure 3, in this Shen
Please be in a kind of preferred embodiment, judgment module 100 also receives the level gauging channel of the dcs from boiler
Signal is detected, whether the level gauging channel which is used to indicate transmitter is normal.When the liquid
When position Measurement channel is normal, which is high level.In Fig. 3, liquid level signal is exported to the first limit
The output of value cell 110, the first threshold cells 110 is connected to and door 304, level gauging access detection signal by NOT gate 302
Be directly output to door 304, export two paths of signals with door 304, the third output signal respectively exported by NOT gate 303 and straight
Connect the 4th output signal of output.From the figure 3, it may be seen that when level gauging channel is normal and the level value of liquid level signal instruction without departing from
When the first preset range, third output signal is low level, and the 4th output signal is high level, shows that liquid level signal is normal (i.e.
Judging result is that liquid level signal is normal)；When the level value that level gauging channel abnormal or liquid level signal indicate is pre- beyond first
If when range, third output signal is high level, the 4th output signal is low level, shows abnormal (the i.e. judgement knot of liquid level signal
Fruit is that liquid level signal is abnormal).
In a kind of optional embodiment of the application, the first determining module 200 includes the second threshold cells 210, this second
Threshold cells 210 export instruction and compare knot for the level value that liquid level signal indicates to be compared with the second preset range
The signal of fruit, the judging result of signal and judgment module 100 of first determining module 200 based on the instruction comparison result, really
It is fixed whether to carry out liquid level of steam drum protection.
Fig. 4 is the logic diagram for the first determining module that a kind of optional embodiment of the application provides.As shown in figure 4, the
Two threshold cells 210 include limit value block 211 and limit value block 212, and the second preset range is limited by liquid level upper limit value and bottom level limit
Fixed, liquid level upper limit value and bottom level limit can be determined according to the type and concrete application of drum, and wherein liquid level upper limit value can be with
It is set as the high trip rating of liquid level of drum, bottom level limit can be set to the low trip rating of liquid level, when level value in drum
When greater than liquid level upper limit value or being less than bottom level limit, need to carry out liquid level protection.In the application optional embodiment, liquid
Position upper limit value can be, for example ,+250mm, and bottom level limit can be, for example, -300mm.
In Fig. 4, limit value block 211 is used to for the level value that liquid level signal indicates being compared with liquid level upper limit value, and
When level value is higher than liquid level upper limit value, high level signal is exported, to indicate that liquid level of steam drum is excessively high；Limit value block 212 is used for liquid level
Value is compared with bottom level limit, and when level value is lower than bottom level limit, high level signal is exported, to indicate drum liquid
Position is too low.The output signal of limit value block 211 and limit value block 212 passes through with door 305,306 and from judgment module 100 respectively
Four output signals (or second output signal in Fig. 2 illustrated embodiment) carry out and logical operation.When the vapour exported with door 305
When packet liquid level height protection signal is high level, corresponding definitive result is to carry out the protection of liquid level of steam drum height, then carries out liquid level of steam drum height
Protection, and alarm module is notified to alarm；It is corresponding to determine when the liquid level of steam drum minimum living shield signal exported with door 306 is high level
As a result to carry out liquid level of steam drum minimum living shield, then liquid level of steam drum minimum living shield is carried out, and alarm module is notified to alarm；When with door 305 and
306 when exporting low level signal, then protects without liquid level of steam drum.
The application embodiment also provides a kind of system for the judgement of liquid level of steam drum relay protective scheme, the system comprises:
Multiple above-mentioned devices for the judgement of liquid level of steam drum relay protective scheme, each device are used for the liquid issued to its corresponding transmitter
Whether position signal is normally carried out judgement, and exports definitive result according to judging result and the liquid level signal；And second determine
Module, for the judging result and definitive result according to multiple devices, it is determined whether carry out liquid level of steam drum protection.
Wherein, the second determining module can determine that the corresponding transmitter of the device is issued according to the judging result of each device
Liquid level signal it is whether normal, and determine some transmitter issue liquid level signal exception in the case where, reject the transmitter
The determination of corresponding device is as a result, carrying out logical operation according to the definitive result for the remaining device not being removed later with determination is
No progress liquid level of steam drum protection.
Under normal circumstances, usually liquid level of steam drum is detected by three transmitters, can is each in the system
The above-mentioned device for the judgement of liquid level of steam drum relay protective scheme, the judging result exported according to each device is arranged in transmitter
Whether the liquid level signal that can determine that its corresponding transmitter issues is normal, can be sentenced according to the definitive result that three devices export
It is disconnected whether to need to carry out liquid level protection.
Second determining module is used to carry out the judging result and definitive result of the corresponding described device of three transmitters comprehensive
Operation is closed, finally to determine whether to carry out liquid level protection.In the present embodiment, the second determining module is in a case where
Determine and carry out liquid level of steam drum protection: (1) liquid level signal that three transmitters issue is all normal and the determination to three described devices
As a result it is true for carrying out the result of two from three logical operation；(2) three transmitters issue liquid level signal at least one it is abnormal and
The definitive result of three described devices is carried out or the result of logical operation is true.Wherein, two from three logical operation refers to, when three
In a input, when at least two inputs are true, then output is true.The realization of two from three logical operation is known skill in this field
Art is not being repeated in this.
Fig. 5 and Fig. 6 is the logic diagram for the second determining module that a kind of optional embodiment of the application provides.Wherein, Fig. 5
Shown is the logic diagram for being used to determine whether to carry out the protection of liquid level of steam drum height in the second determining module, as shown in figure 5, coming
Two from three logical unit is input to from liquid level of steam drum height protection signal 1~3 (i.e. the definitive result of device) of three devices
307 and/or door 309, the 4th output signal 1~3 of three devices be input to and door 308,307 He of two from three logical unit
Output with door 308, which is connected to, is connected to the output with door 311 or door 309 through NOT gate 313 with door 310, the output with door 308
It is also connected to the progress of output warp or door 312 or logical operation with door 310,311 with door 311, and defeated via delay unit 314
Out.As shown in Figure 5, when the 4th output signal 1~3 is high level (as true), show the liquid level that each transmitter issues
Signal is all normal, and the output signal with door 308 is high level, therefore only when the output signal of two from three logical unit 307
When for high level or the output signal of door 312 is just high level；When any one signal is low electricity in the 4th output signal 1~3
When flat (as false), show that its corresponding liquid level signal is abnormal, the output signal with door 308 is low level, therefore only when or door
When 309 output signal is high level or the output signal of door 312 is just high level.Above-mentioned operation result passes through delay unit
314 outputs, if the output of delay unit 314 is high level, it is determined that carry out high liquid level protection.Wherein, delay unit 314 is used for
The output signal that progress liquid level of steam drum protection is used to determine whether in second determining module is detected, and described detecting
It when output signal maintains preset duration, determines that the output signal is effective, and triggers liquid level protection.By the way that delay unit 314 is arranged
Can interference of the interference signal to the second determining module output result in reduction system, avoid liquid level protection misoperation.Shown in Fig. 6
Out be used to determine whether in the second determining module carry out liquid level of steam drum minimum living shield logic diagram, principle is similar with Fig. 5,
It is not being repeated in this.
In addition, system further includes alarm module, with sentencing for each device for the judgement of liquid level of steam drum relay protective scheme
Disconnected module connection is sent out when the judgment module judges the liquid level signal exception that its corresponding transmitter issues to alarm module
It alarms after sending alarm signal, alarm module to receive alarm signal.In the application optional embodiment, such as Fig. 2 and Fig. 3 institute
Show, the first output signal or third output signal of each described device can be directly output to alarm module, work as alarm module
When detecting that the first output signal or third output signal are high level, issues and alarm to operator station, and can pass through
Man-machine interface display alarm information.In addition, the second determining module can also be connect with alarm module, when the second determining module determines
When carrying out liquid level of steam drum protection (such as the protection of liquid level height or liquid level minimum living shield), alarm signal is sent to the alarm module,
Alarm module is alarmed after receiving alarm signal.
The liquid level issued to transmitter is increased in liquid level of steam drum protection decision logic by the application above scheme
The quality of signal judges, that is, increase judge the liquid level signal whether be normal signal condition, when liquid level signal exception, by
In introducing the Rule of judgment to liquid level signal, therefore the malfunction of liquid level protection is not will lead to.In addition, passing through three pick-ups
When device detects liquid level of steam drum, it is all normal that the liquid level signal issued when three transmitters may be implemented in technical scheme
When, relay protective scheme is two from three manner of execution, and when the liquid level signal that three transmitters issue has an exception, relay protective scheme is certainly
Turn takes a manner of execution for two, and when the liquid level signal that three transmitters issue is there are two when exception, relay protective scheme switchs to automatically
One takes a manner of execution, to improve the accuracy of liquid level protection act, ensure that the safe and stable operation of boiler system.
The optional embodiment of the embodiment of the present invention is described in detail in conjunction with attached drawing above, still, the embodiment of the present invention is simultaneously
The detail being not limited in above embodiment can be to of the invention real in the range of the technology design of the embodiment of the present invention
The technical solution for applying example carries out a variety of simple variants, such as in the case where being able to achieve identical function, can be to each embodiment
In logic unit modify and replace, these simple variants belong to the protection scope of the embodiment of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the embodiment of the present invention pair
No further explanation will be given for various combinations of possible ways.
It will be appreciated by those skilled in the art that implementing the method for the above embodiments is that can pass through
Program is completed to instruct relevant hardware, which is stored in a storage medium, including some instructions are used so that single
Piece machine, chip or processor (processor) execute all or part of the steps of each embodiment the method for the application.And it is preceding
The storage medium stated includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory
The various media that can store program code such as (RAM, Random Access Memory), magnetic or disk.
In addition, any combination can also be carried out between a variety of different embodiments of the embodiment of the present invention, as long as it is not
The thought of the embodiment of the present invention is violated, equally should be considered as disclosure of that of the embodiment of the present invention.
Claims (10)
1. a kind of device for the judgement of liquid level of steam drum relay protective scheme, which is characterized in that described device includes:
The judgment module connecting with the transmitter for detecting liquid level of steam drum, the judgment module are received from the transmitter
Liquid level signal, it is whether normal for judging the liquid level signal, and export judging result；And
The first determining module connecting with the judgment module and the transmitter, first determining module are based on the judgement
As a result with the liquid level signal, it is determined whether carry out liquid level of steam drum protection, and export definitive result.
2. the apparatus according to claim 1, which is characterized in that the judgment module includes the first threshold cells, and described the
One threshold cells are for the level value that the liquid level signal indicates to be compared with the first preset range, when the level value is super
Out when first preset range, the first threshold cells output indicates the signal of level value exception, and the judging result is
Liquid level signal is abnormal, and when the level value is without departing from first preset range, first threshold cells export indicator solution
The normal signal of place value, the judging result are that liquid level signal is normal.
3. the apparatus of claim 2, which is characterized in that the judgment module is also received from dcs
Level gauging access detection signal, the level gauging that the level gauging access detection signal is used to indicate the transmitter is logical
Whether road is normal, when the level gauging access detection signal indicates that the level gauging channel is normal and first limit value
In the case where the unit output instruction normal signal of level value, the judging result is that liquid level signal is normal.
4. the apparatus according to claim 1, which is characterized in that first determining module includes the second threshold cells, institute
The second threshold cells are stated for the level value that the liquid level signal indicates to be compared with the second preset range, and export instruction
The signal of comparison result, signal and the judging result of first determining module based on the instruction comparison result, determines
Whether liquid level of steam drum protection is carried out.
5. device according to claim 4, which is characterized in that second threshold cells include the first limit value block and second
Limit value block, the first limit value block are higher than for being compared the level value with liquid level upper limit value in the level value
When the liquid level upper limit value, the excessively high signal of output instruction liquid level of steam drum, the second limit value block be used for by the level value with
Bottom level limit is compared, and when the level value is lower than the bottom level limit, and it is too low to export instruction liquid level of steam drum
Signal.
6. device according to claim 5, which is characterized in that the definitive result include carry out the protection of liquid level of steam drum height,
It carries out liquid level of steam drum minimum living shield and is protected without liquid level, wherein
When the judging result is that liquid level signal is normal, and the first limit value block output instruction liquid level of steam drum is excessively high
Signal when, the definitive result of output is to carry out the protection of liquid level of steam drum height；
When the judging result is that liquid level signal is normal, and the second limit value block output instruction liquid level of steam drum is too low
Signal when, the definitive result of output is to carry out liquid level of steam drum minimum living shield；
Otherwise, the definitive result of output is to protect without liquid level.
7. a kind of system for the judgement of liquid level of steam drum relay protective scheme, which is characterized in that the system comprises:
Multiple devices for the judgement of liquid level of steam drum relay protective scheme as claimed in any one of claims 1 to 6, each dress
Set whether the liquid level signal for issuing to its corresponding transmitter is normally carried out judgement, and according to judging result and the liquid level
Signal exports definitive result；And
Second determining module, for the judging result and the definitive result according to multiple described devices, it is determined whether into
The protection of row liquid level of steam drum.
8. system according to claim 7, which is characterized in that detected when by three transmitters to liquid level of steam drum
When, the system comprises three described devices, second determining module carries out liquid level of steam drum for determining in a case where
Protection:
The liquid level signal that three transmitters issue is all normal and the knot of two from three logical operation is carried out to the definitive result
Fruit is true；And
At least one is abnormal and carry out to the definitive result or logical operation for the liquid level signal that three transmitters issue
Result be true.
9. system according to claim 7, which is characterized in that second determining module further includes delay unit, is used for
The output signal for being used to determine whether progress liquid level of steam drum protection in second determining module is detected, and is being detected
When the output signal maintains preset duration, determine that the output signal is effective.
10. system according to claim 7, which is characterized in that the system also includes alarm modules, with described device
Judgment module is connected with second determining module, wherein
When the judgment module judges the liquid level signal exception that its corresponding described transmitter issues, sent out to the alarm module
Send alarm signal, the alarm module alarm；And
When second determining module, which determines, carries out liquid level of steam drum protection, alarm signal is sent to the alarm module, it is described
Alarm module alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820786161.1U CN208333596U (en) | 2018-05-24 | 2018-05-24 | Device and system for the judgement of liquid level of steam drum relay protective scheme |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN110415850A (en) * | 2019-08-06 | 2019-11-05 | 中国核动力研究设计院 | A kind of design method reducing reactor protection system malfunction rate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110415850A (en) * | 2019-08-06 | 2019-11-05 | 中国核动力研究设计院 | A kind of design method reducing reactor protection system malfunction rate |
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