CN206863579U - A kind of device of raising DCS control systems temperature protection input security - Google Patents
A kind of device of raising DCS control systems temperature protection input security Download PDFInfo
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- CN206863579U CN206863579U CN201720752726.XU CN201720752726U CN206863579U CN 206863579 U CN206863579 U CN 206863579U CN 201720752726 U CN201720752726 U CN 201720752726U CN 206863579 U CN206863579 U CN 206863579U
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- temperature
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Abstract
A kind of device of raising DCS control systems temperature protection input security, wherein scene temperature measuring point input unit is connected to the high limit decision circuitry of the first temperature, input temp bad point decision circuitry, rate temperature change differential calculation circuit, the high limit decision circuitry of first temperature is connected to and gate circuit, input temp bad point decision circuitry is connected to by not circuit and gate circuit, rate temperature change differential calculation circuit is connected to the S triggering ends of rest-set flip-flop circuit by the high limit decision circuitry of second temperature, S triggering end trigger protections exit end and are connected to by not circuit and gate circuit, protection act output order device is connected to gate circuit；Reset instruction pulser is connected to the R triggering ends of rest-set flip-flop circuit after temperature anomaly processing.The utility model has the advantage of：When the abnormal conditions that rate of change transfinites occurs in temperature point, temperature protection can be cut off in time, prevent equipment even unit from tripping extremely.
Description
Technical field
Industry Control is the utility model is related to, it is more particularly to a kind of to improve DCS control systems temperature protection input security
Device.
Background technology
With the progress of science and technology, industrial stokehold especially power generation process control is rapidly developed, DCS controls
System (scattered control system) is used widely in industries such as electric power, metallurgy, petrochemical industry, becomes each process of factory production
" brain " and " eyes ", the security, stability, economy of relevant industries production are effectively increased, promotes energy-conserving and environment-protective target
Realization.
DCS system mainly has data acquisition, sequential control, interlock protection, the major function, wherein temperature such as automatically adjusts
Interlock protection is to ensure that the key function of main equipment safety.The scene temperature that the function is received by accessing data collecting system
Signal, by logical operation and judgement, output temperature protection signal to each relevant device, it is set to occur in time accordingly
Interlocking acts, to ensure the safety of equipment and unit.
Important monitoring parameters of the temperature signal as major-minor equipment, there are the measuring cells such as TC, the RTD at scene to input to DCS
Control system, while most important temperature protection measurements both participate in the protective loop of major-minor equipment.Due to temperature measuring equipment work
Make the problem of state, stable signal transmission etc. are present, signal may be caused to occur abnormal, further result in the temperature of correlation
Degree protection project sends the protection act instruction of mistake, seriously even triggers equipment and unit tripping.It is necessary in this case
By works engineer by this protect project it is out of service, carry out overhaul.After abnormal protection signal maintenance occurs,
Works engineer again can then put temperature protection project into operation.Because temperature protection action command can directly trip accordingly
Main and auxiliaries equipment, has a direct impact to unit and equipment safety, it is therefore necessary to be ensured of temperature protection signal without bad value,
Transfinited without speed, and the temperature protection project put under normal circumstances in temperature, prevented because exception occurs again in protection signal,
Once protection is put into, system is to send the protection act instruction of mistake, and such accident case is of common occurrence at home and abroad,
Caused by economy and social loss it is surprising.Therefore must be put into DCS control systems temperature protection in function according to temperature protection
The state of signal, set temperature anomaly in the case of can cut off in time temperature protection project and meanwhile can in time alert device fortune
The device of administrative staff.
Utility model content
Technical problem to be solved in the utility model can be cut off in time in the case of being the provision of a kind of temperature anomaly
The device of the raising DCS control systems temperature protection input security of temperature protection project.
The utility model is that solve above-mentioned technical problem by the following technical programs：One kind improves DCS control system temperature
The device of degree protection input security, including reset instruction pulse after the processing of scene temperature measuring point input unit (3), temperature anomaly
The high limit decision circuitry (4) of device (10), the first temperature, input temp bad point decision circuitry (5), the second not circuit (6), temperature
The high limit decision circuitry (8) of rate of change differential calculation circuit (7), second temperature, rest-set flip-flop circuit (9), the 3rd not circuit
(11), with gate circuit (12), protection act output order device (13)；
Scene temperature measuring point input unit (3) is connected to three circuits：The high limit decision circuitry (4) of first temperature, input temperature
Spend bad point decision circuitry (5), rate temperature change differential calculation circuit (7), the output end of the high limit decision circuitry (4) of the first temperature
It is connected to and passes through the second NOT gate with first input of gate circuit (12), the output end of input temp bad point decision circuitry (5)
Circuit (6) is connected to be connected with second input of gate circuit (12), the output end of rate temperature change differential calculation circuit (7)
The high limit decision circuitry (8) of second temperature is connect, the output end of the high limit decision circuitry (8) of second temperature is connected to rest-set flip-flop circuit
S triggering ends, the S triggering end trigger protections of rest-set flip-flop circuit exit end and are connected to by the 3rd not circuit (11) and gate circuit
(12) the 3rd input, protection act output order device (13) is connected to the output end of gate circuit (12)；Temperature is different
Often reset instruction pulser (10) is connected to the R triggering ends of rest-set flip-flop circuit after processing.
As the technical scheme of optimization, the device of raising DCS control systems temperature protection input security also includes temperature
Degree maintenance command pulse issue device (1) and the first not circuit (2), the temperature maintenance command pulse issue device (1) is even
Connect the input of the first not circuit (2), the output end connection of the first not circuit (2) and the 4th input of gate circuit (12)
End.
As the technical scheme of optimization, first not circuit (2) draws one inspecting state display lamp (14) of connection.
As the technical scheme of optimization, the high limit decision circuitry (4) of the first temperature and high limit decision circuitry (8) knot of second temperature
Structure is identical.
As the technical scheme of optimization, the high limit decision circuitry (4) of the first temperature and the high limit decision circuitry (8) of second temperature are equal
Including operational amplifier, resistance R1, R2, R3, R1, R4, input of the resistance R1 one end as temperature value signal U1, the other end connects
The inverting input of operational amplifier is connect, resistance R2 one end is as the input with reference to fixed voltage U2, other end concatenation operation
The normal phase input end of amplifier, the output end connection resistance R4 of operational amplifier one end, the resistance R4 other end is as temperature
The output end of high limit decision circuitry, connects resistance R3 between the normal phase input end of operational amplifier and output end.
As the technical scheme of optimization, the high limit decision circuitry (4) of first temperature is drawn one state of transfiniting of connection and shown
Show lamp (15).
As the technical scheme of optimization, the output of second not circuit (6) connects a temperature bad value status display
Lamp (16).
As the technical scheme of optimization, the S triggering end trigger protections of the rest-set flip-flop circuit (9) exit end connection one
Display lamp (17) is exited in temperature rate's protection of transfiniting.
As the technical scheme of optimization, the R triggering ends trigger protection input end of the rest-set flip-flop circuit connects a guarantor
Shield input display lamp (18).
The utility model has advantages below compared with prior art：There are the abnormal feelings that rate of change transfinites in temperature point
During condition, temperature protection can be cut off in time, prevent from, because of the input of mistake this protection project when temperature protection abnormal signal is mutated, making
Forming apparatus even unit trips extremely.State is carried out to the coherent signal of DCS control system temperature protections using the device simultaneously
Recognize, prompt whether the temperature is in high limit alarm condition, whether is broken string or the bad value situation that transfinites, main frame and auxiliary equipment are examined
The personnel of repairing can according to condition prompting put into maintenance pulse command, improve DCS control system temperature protection projects security and can
By property.
Brief description of the drawings
Fig. 1 is the structural representation for the device that the utility model improves DCS control systems temperature protection input security.
Fig. 2 is the circuit diagram of the high limit decision circuitry of temperature in the utility model.
Embodiment
Embodiment of the present utility model is elaborated below, the present embodiment using technical solutions of the utility model before
Put and implemented, give detailed embodiment and specific operating process, but the scope of protection of the utility model is unlimited
In following embodiments.
As shown in figure 1, a kind of device of raising DCS control systems temperature protection input security of the present embodiment, including temperature
Reset instruction pulse fills after degree maintenance command pulse issue device 1, scene temperature measuring point input unit 3 and temperature anomaly processing
Put the high limit decision circuitry 4 of the 10, first not circuit 2, the first temperature, input temp bad point decision circuitry 5, the second not circuit 6,
The high limit decision circuitry 8 of rate temperature change differential calculation circuit 7, second temperature, rest-set flip-flop circuit 9, the 3rd not circuit 11,
With gate circuit 12, protection act output order device 13.
The temperature maintenance command pulse issue device 1 connects the input of the first not circuit 2, the first not circuit 2
Output end connection and the 4th input of gate circuit 12；Scene temperature measuring point input unit 3 is connected to three circuits：First
The high limit decision circuitry 4 of temperature, input temp bad point decision circuitry 5, rate temperature change differential calculation circuit 7, the first temperature are high
The output end of limit decision circuitry 4 is connected to first input with gate circuit 12, the output of input temp bad point decision circuitry 5
End is connected to second input with gate circuit 12 by the second not circuit 6, rate temperature change differential calculation circuit 7
The high limit decision circuitry 8 of output end connection second temperature, the output end of the high limit decision circuitry 8 of second temperature are connected to rest-set flip-flop electricity
The S triggering ends on road, the S triggering end trigger protections of rest-set flip-flop circuit exit end and are connected to and door electricity by the 3rd not circuit 11
3rd input on road 12, protection act output order device 13 is connected to the output end of gate circuit 12；At temperature anomaly
Reset instruction pulser 10 is connected to the R triggering ends of rest-set flip-flop circuit after reason.
The device course of work of raising DCS control systems temperature protection input security is as follows：
Scene temperature measuring point input unit 3 is connected to three circuits：The high limit decision circuitry 4 of first temperature, input temp are bad
Point decision circuitry 5, rate temperature change differential calculation circuit 7；When the high limit decision circuitry 4 of the first temperature is judged as transfiniting then first
The high limit decision circuitry 4 of temperature exports high level；When input temp does not occur the bad value such as break, transfinite, input temp bad point judges
The output of circuit 5 low level, export high level after being handled by the second not circuit 6；When input temp passes through rate temperature change
When speed does not transfinite after the high limit decision circuitry 8 of differential calculation circuit 7, second temperature judges, then by RS triggers circuits 9 and second
Not circuit 6 exports high level.It is dynamic that 3 high level signals of the above can act output order device 13 when coming with trigger protection
Make.For the ease of operations staff when there is temperature anomaly mutation, carry out facilitating temperature spot isolation maintenance during service work, avoid
Temperature protection false triggering.We add maintenance input circuit signal all the way in temperature protection and gate circuit 12, when temperature is examined
After repairing the input of command pulse device 1, low level signal is exported after being acted on by the first not circuit 2, then with gate circuit 12 all the time
Low level is exported, temperature protection can not then be operating normally, and prevent protection misoperation during maintenance.When operations staff check man makes knots
Shu Hou, operations staff can cut off temperature maintenance command pulse device 1, while confirm that temperature spot puts into temperature again after recovering normal
Reset instruction pulser 10 after abnormality processing, so as to again temperature protection loop can continue executing with temperature protection effect.
The high limit decision circuitry figure such as Fig. 2 of temperature, the high limit decision circuitry 4 of the first temperature and the high limit decision circuitry 8 of second temperature
Structure is the same, including operational amplifier, resistance R1, R2, R3, R1, R4, input of the resistance R1 one end as temperature value signal U1
End, the inverting input of other end concatenation operation amplifier, resistance R2 one end are another as the input with reference to fixed voltage U2
The normal phase input end of concatenation operation amplifier is held, the output end connection resistance R4 of operational amplifier one end, resistance R4's is another
The output end as the high limit decision circuitry of temperature is held, resistance is connected between the normal phase input end of operational amplifier and output end
R3.By operational amplifier by the temperature value signal U1 of input compared with one with reference to fixed voltage U2, in both amplitudes
Near equal, output voltage values U0 will produce transition, corresponding to export high level or low level signal.
In embodiment：First not circuit 2 draws one inspecting state display lamp 14 of connection, for showing the temperature
Measuring point is in inspecting state, and temperature protection has dropped out；The high limit decision circuitry 4 of first temperature draws one state that transfinites of connection
Display lamp 15, for showing that the temperature point reaches ceiling value, remind operations staff to pay close attention to the measuring point in time, avoid temperature anomaly
Accident further expands；The output of second not circuit 6 connects a temperature bad value state display lamp 16, for showing temperature
Spend measuring point quality quality state；The S triggering end trigger protections of the rest-set flip-flop circuit 9 exit end one temperature rate of connection and surpassed
Display lamp 17 is exited in limit protection, is exited for the protection of displays temperature abnormal sudden change；The R triggering ends triggering of the rest-set flip-flop circuit
Protection input end connects a protection input display lamp 18, for protecting input state after displays temperature abnormality processing.
In the DCS control systems used in the present embodiment reply industrial production, temperature can be exited in time in temperature anomaly
Protection, while energy automatic identification temperature protection signal condition reminds operations staff in time, improves what temperature protection was put into again
Reliability, it is the dress for preventing temperature protection instruction errors from sending, reminding temperature protection input state and operating maintenance present situation in time
Put.He can one be led in/out signal by plugs and sockets on an independent wiring board or be made in control panel
In control circuit a part.
, can be by corresponding temperature when operations staff need to overhaul to operational outfit portion temperature measuring point by the present embodiment
Degree protection input inspecting state, DCS control system pictures have prompt message " temperature point is in maintenance position ", then are now
The triggering of temperature protection signal is set also not cause protection act；When temperature point exceedes high limit limitation, corresponding DCS control systems
Picture prompts " temperature over-range alarm ", can alert device operations staff in time；When the bad value feelings such as break, transfinite occurs in temperature point
During condition, corresponding DCS control systems picture prompting " alarm of temperature bad value ", while temperature protection can also be cut off in time；When temperature is surveyed
When there are the abnormal conditions such as saltus step in point, DCS control systems picture prompting " temperature rate's overload alarm ", while the protective loop is cut
Remove, after temperature point is not in mutation, reset instruction can be put into after being judged by equipment operations staff, while show " temperature speed
Rate, which transfinites, resets input ".Ensure to put into the protection project because temperature protection signal is under triggering state and cause temperature
Protection act instruction errors trigger.Prompting can be used as final prompting by hardware state lamp above.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (9)
1. a kind of device of raising DCS control systems temperature protection input security, it is characterised in that including scene temperature measuring point
Reset instruction pulser (10), the high limit decision circuitry (4) of the first temperature, input temperature after input unit (3), temperature anomaly processing
The high limit of degree bad point decision circuitry (5), the second not circuit (6), rate temperature change differential calculation circuit (7), second temperature is sentenced
Deenergizing (8), rest-set flip-flop circuit (9), the 3rd not circuit (11) and gate circuit (12), protection act output order device
(13)；
Scene temperature measuring point input unit (3) is connected to three circuits：The high limit decision circuitry (4) of first temperature, input temp are bad
Point decision circuitry (5), rate temperature change differential calculation circuit (7), the output end connection of the high limit decision circuitry (4) of the first temperature
To first input with gate circuit (12), the output end of input temp bad point decision circuitry (5) passes through the second not circuit
(6) it is connected to and second input of gate circuit (12), the output end connection the of rate temperature change differential calculation circuit (7)
The high limit decision circuitry (8) of two temperature, the S that the high output end for limiting decision circuitry (8) of second temperature is connected to rest-set flip-flop circuit are touched
Originator, the S triggering end trigger protections of rest-set flip-flop circuit exit end and are connected to by the 3rd not circuit (11) and gate circuit
(12) the 3rd input, protection act output order device (13) is connected to the output end of gate circuit (12)；Temperature is different
Often reset instruction pulser (10) is connected to the R triggering ends of rest-set flip-flop circuit after processing.
2. a kind of device of raising DCS control systems temperature protection input security as claimed in claim 1, its feature exist
In, in addition to temperature maintenance command pulse issue device (1) and the first not circuit (2), the temperature maintenance command pulse hair
Go out the input that device (1) connects the first not circuit (2), output end connection and the gate circuit (12) of the first not circuit (2)
The 4th input.
3. a kind of device of raising DCS control systems temperature protection input security as claimed in claim 2, its feature exist
In first not circuit (2) draws one inspecting state display lamp (14) of connection.
4. a kind of device of raising DCS control systems temperature protection input security as claimed in claim 1, its feature exist
In the high limit decision circuitry (4) of the first temperature is identical with high limit decision circuitry (8) structure of second temperature.
5. a kind of device of raising DCS control systems temperature protection input security as claimed in claim 1, its feature exist
In the high limit decision circuitry (4) of, the first temperature and the high limit decision circuitry (8) of second temperature including operational amplifier, resistance R1,
R2, R3, R1, R4, input of the resistance R1 one end as temperature value signal U1, the anti-phase input of other end concatenation operation amplifier
End, resistance R2 one end is as the input with reference to fixed voltage U2, the normal phase input end of other end concatenation operation amplifier, computing
The output end connection resistance R4 of amplifier one end, the resistance R4 other end limit the output end of decision circuitry as temperature height,
Resistance R3 is connected between the normal phase input end and output end of operational amplifier.
6. a kind of device of raising DCS control systems temperature protection input security as claimed in claim 1, its feature exist
In the high limit decision circuitry (4) of first temperature draws one state display lamp that transfinites (15) of connection.
7. a kind of device of raising DCS control systems temperature protection input security as claimed in claim 1, its feature exist
In the output of second not circuit (6) connects a temperature bad value state display lamp (16).
8. a kind of device of raising DCS control systems temperature protection input security as claimed in claim 1, its feature exist
End one temperature rate of connection protection of transfiniting, which is exited, in the S triggering end trigger protections of, the rest-set flip-flop circuit (9) exits display
Lamp (17).
9. a kind of device of raising DCS control systems temperature protection input security as claimed in claim 1, its feature exist
In the R triggering ends trigger protection input end of the rest-set flip-flop circuit connects a protection input display lamp (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720752726.XU CN206863579U (en) | 2017-06-27 | 2017-06-27 | A kind of device of raising DCS control systems temperature protection input security |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720752726.XU CN206863579U (en) | 2017-06-27 | 2017-06-27 | A kind of device of raising DCS control systems temperature protection input security |
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| Publication Number | Publication Date |
|---|---|
| CN206863579U true CN206863579U (en) | 2018-01-09 |
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|---|---|---|---|
| CN201720752726.XU Expired - Fee Related CN206863579U (en) | 2017-06-27 | 2017-06-27 | A kind of device of raising DCS control systems temperature protection input security |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111371069A (en) * | 2020-04-14 | 2020-07-03 | 攀钢集团西昌钢钒有限公司 | Overtemperature protection device for transformer |
| CN111895489A (en) * | 2020-06-17 | 2020-11-06 | 天津国电津能滨海热电有限公司 | Enthalpy value calculation-based unit heat supply steam extraction flow measuring method |
| CN112083643A (en) * | 2020-09-29 | 2020-12-15 | 华润电力（菏泽）有限公司 | Thermal protection switching method and device for thermal power plant |
| CN112412551A (en) * | 2020-10-28 | 2021-02-26 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Method for preventing sudden drop of steam inlet temperature of steam turbine and protecting tripping |
| CN113138590A (en) * | 2021-04-15 | 2021-07-20 | 国家电投集团江西电力工程有限公司 | Logic system for improving temperature quality judgment reliability of DCS (distributed control system) |
| CN114489172A (en) * | 2020-11-12 | 2022-05-13 | 山西潞安煤基清洁能源有限责任公司 | Temperature interlocking judgment method, system and equipment |
-
2017
- 2017-06-27 CN CN201720752726.XU patent/CN206863579U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111371069A (en) * | 2020-04-14 | 2020-07-03 | 攀钢集团西昌钢钒有限公司 | Overtemperature protection device for transformer |
| CN111895489A (en) * | 2020-06-17 | 2020-11-06 | 天津国电津能滨海热电有限公司 | Enthalpy value calculation-based unit heat supply steam extraction flow measuring method |
| CN112083643A (en) * | 2020-09-29 | 2020-12-15 | 华润电力（菏泽）有限公司 | Thermal protection switching method and device for thermal power plant |
| CN112412551A (en) * | 2020-10-28 | 2021-02-26 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Method for preventing sudden drop of steam inlet temperature of steam turbine and protecting tripping |
| CN114489172A (en) * | 2020-11-12 | 2022-05-13 | 山西潞安煤基清洁能源有限责任公司 | Temperature interlocking judgment method, system and equipment |
| CN113138590A (en) * | 2021-04-15 | 2021-07-20 | 国家电投集团江西电力工程有限公司 | Logic system for improving temperature quality judgment reliability of DCS (distributed control system) |
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| CF01 | Termination of patent right due to non-payment of annual fee |