CN101465538A - Temperature protection method for DCS system - Google Patents
Temperature protection method for DCS system Download PDFInfo
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- CN101465538A CN101465538A CNA2007102032435A CN200710203243A CN101465538A CN 101465538 A CN101465538 A CN 101465538A CN A2007102032435 A CNA2007102032435 A CN A2007102032435A CN 200710203243 A CN200710203243 A CN 200710203243A CN 101465538 A CN101465538 A CN 101465538A
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Abstract
The invention discloses a temperature protecting method in a DCS system, comprising the following steps: a temperature input module processes digital signal sent by an input fastener, then a logic computing module is utilized for carrying out output protecting action after processing; the method is characterized in that: the judgment of speed over limitation is led in after the temperature input module processes the digital signal, according to output value of the temperature input module, a speed computing module is utilized for judging the changing speed; when the changing speed exceeds to the setting value, the speed judgment Boolean quantity indicating signal is sent out, and then logic processing is carried out to bad value BAD, high protecting value and speed judgment by the logic computing module, then the protecting action is output to an output module or abnormal alarming is output to an alarming module; the method not only can protect producing devices and personnel safety to the maximum extent, but also can prevent mis-protecting action to the maximum extent, thus being possible to reduce mis-stopping under an abnormal condition.
Description
Technical field
The present invention relates to a kind of temperature protecting method in the DCS system.
Background technology
Protective system in heat power is as the pith of Thermal Automation; particularly to the security interlocking protection method of stopping in emergency of causing by temperature and so on; not only require when protecting process units and personal safety to greatest extent, also require to reduce as much as possible the mistakenly stop car under the abnormal condition.Along with the development of Distributed Control System (DCS) in function and configuration aspects, protective system in heat power can be realized by DCS fully.All induced draft fans in the flue gas purification system all are provided with the high protection of temperature of motor and blower fan; in case motor or blower fan temperature are too high; to cause the generation of protection action, promptly cut off induced draft fan, may cause stop transport whole flue gas purification system and even whole production system at last.In actual production process; because broken string or terminal connections loose contact, loosening take place for motor and blower fan temperature element (thermal resistance or thermocouple), cause dut temperature to raise suddenly, cause that the protection action takes place; this is misoperation, and frequent misoperation meeting has a strong impact on the normal operation of production.
When in the DCS system, realizing the temperature protection logical design; usual way as shown in Figure 1; the digital signal that " temperature input module " sent here " input fastener " is handled; define as range; high protection value is set; (the bad value BAD of signal is when importing that the fastener equipment state is made mistakes or channel failure when occurring the bad value BAD of signal; the bad value of signal BAD is true) judge etc.; utilize " logical calculated module " to carry out logical operation again; to non-and " the high protection value " of " bad value BAD " with; be the normal and temperature of temperature element when surpassing " high protection value ", the output protection action.Here " the bad value BAD " that only depend on " temperature input module " in the DCS system judges, facts have proved that the method has certain effect, but DeGrain also can cause considerable mistake protection action to take place.Through serious analysis, find that there is time-delay in temperature element when broken string, be not just bad immediately, when termination contact was bad in addition, its value was suddenly big or suddenly small, the possibility that this just exists mistake protection action to take place.
Summary of the invention
The technical problem to be solved in the present invention is: provide the temperature protecting method in a kind of DCS system, to overcome the deficiency that mistake protection action may take place that exists in the prior art.
The present invention takes following technical scheme: the present invention is except introducing the judgement to " bad value BAD ", and key also is to have introduced the judgement to the temperature value rate of change." rate calculations module " realizes the judgement to the input value rate of change; when rate of change exceeds set point, provide speed and judge the Boolean quantity index signal; " logical calculated module " carries out logical operation to " bad value BAD ", " high protection value ", " speed judgement ", realizes protection output and abnormal alarm output.At this moment the logic of " logical calculated module " as shown in Figure 3, temperature element is unusual judge by " bad value BAD " reach " speed transfinites " mutually or, latch by " Rs trigger " then, it is got non-back and " high protection value " and protect afterwards and export.
When temperature element broken string or termination contact are bad, all can cause temperature to surpass " high protection value ", but it is not just to disconnect immediately; have certain time-delay, " bad value BAD " is false at this moment, according to the conventional design logic; should move by output protection, this is a malfunction.After the judgement of having introduced " speed transfinites "; the temperature that temperature element broken string or termination contact cause when bad surpasses " high protection value "; this moment, rate temperature change can be very rapid; surpass the rate setting value; " speed transfinites " is for true; its with " bad value BAD " be mutually or relation, the generation of so just having avoided mistake protection to move.
This temperature protecting method has been introduced the judgement to " bad value BAD "; eliminated generation because of the mistake protection action that input fastener equipment state is made mistakes, channel failure causes when taking place; introduced judgement simultaneously to " speed transfinites "; can eliminate to greatest extent and have time-delay when breaking because of temperature element, termination contact is bad to be caused thermometric value fluctuation time causes the generation that the mistake protection is moved.When reducing mistake protection action generation, the generation of safeguard protection action when also not influencing emergency is to reach best control effect.
Temperature protecting method of the present invention does not need to increase any instrumentation, and can realize easily during configuration in the DCS system.Facts have proved that this method is simply suitable, not only can when protecting process units and personal safety to greatest extent, also can avoid the generation of mistake protection action to greatest extent, reduce the mistakenly stop car under the abnormal condition as much as possible.
Description of drawings
Fig. 1 is the temperature protecting method logical process schematic flow sheet in the DCS system of prior art;
Fig. 2 is the temperature protecting method logical process schematic flow sheet in the DCS of the present invention system;
Fig. 3 is " logical calculated module " the handling process schematic diagram in the temperature protecting method in the DCS of the present invention system.
Embodiment
Embodiments of the invention: temperature protecting method of the present invention such as Fig. 2, shown in Figure 3, except introducing judgement to " bad value BAD ", the crucial judgement that also is to have introduced to the temperature value rate of change." rate calculations module " realizes the judgement to the input value rate of change; when rate of change exceeds set point, provide speed and judge the Boolean quantity index signal; " logical calculated module " carries out logical operation to " bad value BAD ", " high protection value ", " speed judgement ", realizes protection output and abnormal alarm output.At this moment the logic of " logical calculated module " as shown in Figure 3, temperature element is unusual judge by " bad value BAD " reach " speed transfinites " mutually or, latch by " Rs trigger " then, it is got non-back and " high protection value " and protect afterwards and export.
When temperature element broken string or termination contact are bad, all can cause temperature to surpass " high protection value ", but it is not just to disconnect immediately; have certain time-delay, " bad value BAD " is false at this moment, according to the conventional design logic; should move by output protection, this is a malfunction.Introduced after the judgement to " speed transfinites "; the temperature that temperature element broken string or termination contact cause when bad surpasses " high protection value "; this moment, rate temperature change can be very rapid; surpass the rate setting value; " speed transfinites " is for true; its with " bad value BAD " be mutually or relation, the generation of so just having avoided mistake protection to move.
Claims (2)
- Temperature protecting method in [claim 1] a kind of DCS system; it comprises that the digital signal that " temperature input module " sent here " input fastener " handles; utilize " logical calculated module " to handle back output protection action again; it is characterized in that: introduce the judgement of " speed transfinites " in " temperature input module " back; output valve according to " temperature input module "; by " rate calculations module " its rate of change is judged; when rate of change exceeds set point, provide speed and judge the Boolean quantity index signal; by " logical calculated module " to " bad value BAD "; " high protection value "; after " speed judgement " carries out logical process, report to the police to the action of " output module " output protection or to " alarm module " output abnormality.
- Temperature protecting method in [claim 2] DCS according to claim 1 system; it is characterized in that: " bad value BAD ", " high protection value ", " speed judgement " are carried out in the logical process by " logical calculated module "; temperature element is unusual judge by " bad value BAD " reach " speed transfinites " phase or; latch by " Rs trigger " then, it is got non-back and " high protection value " and protection output afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007102032435A CN101465538A (en) | 2007-12-19 | 2007-12-19 | Temperature protection method for DCS system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007102032435A CN101465538A (en) | 2007-12-19 | 2007-12-19 | Temperature protection method for DCS system |
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| Publication Number | Publication Date |
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| CN101465538A true CN101465538A (en) | 2009-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007102032435A Pending CN101465538A (en) | 2007-12-19 | 2007-12-19 | Temperature protection method for DCS system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103885424A (en) * | 2014-03-28 | 2014-06-25 | 大唐贵州发耳发电有限公司 | DCS system temperature line breakage protection logic |
| CN106292581A (en) * | 2016-08-12 | 2017-01-04 | 浙江智海化工设备工程有限公司 | A kind of DCS configuration method preventing temperature survey value mutation |
| CN106502229A (en) * | 2016-12-27 | 2017-03-15 | 国网辽宁省电力有限公司电力科学研究院 | Thermal power plant's DCS system prevents the method that thermal resistance protects failure |
| CN110471467A (en) * | 2019-08-08 | 2019-11-19 | 浙江浙能嘉华发电有限公司 | Intelligent temperature protecting method and its system |
| 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) |
| CN113533874A (en) * | 2020-04-21 | 2021-10-22 | 北京新能源汽车股份有限公司 | Virtual connection detection method and device for auxiliary instrument panel assembly, vehicle and storage medium |
| CN114088234A (en) * | 2021-11-13 | 2022-02-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Industrial thermal resistance temperature measurement disconnection protection system |
-
2007
- 2007-12-19 CN CNA2007102032435A patent/CN101465538A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103885424A (en) * | 2014-03-28 | 2014-06-25 | 大唐贵州发耳发电有限公司 | DCS system temperature line breakage protection logic |
| CN103885424B (en) * | 2014-03-28 | 2016-08-17 | 大唐贵州发耳发电有限公司 | A kind of DCS system temperature breaking protection gate |
| CN106292581A (en) * | 2016-08-12 | 2017-01-04 | 浙江智海化工设备工程有限公司 | A kind of DCS configuration method preventing temperature survey value mutation |
| CN106502229A (en) * | 2016-12-27 | 2017-03-15 | 国网辽宁省电力有限公司电力科学研究院 | Thermal power plant's DCS system prevents the method that thermal resistance protects failure |
| CN110471467A (en) * | 2019-08-08 | 2019-11-19 | 浙江浙能嘉华发电有限公司 | Intelligent temperature protecting method and its system |
| CN113533874A (en) * | 2020-04-21 | 2021-10-22 | 北京新能源汽车股份有限公司 | Virtual connection detection method and device for auxiliary instrument panel assembly, vehicle and storage medium |
| 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) |
| CN114088234A (en) * | 2021-11-13 | 2022-02-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Industrial thermal resistance temperature measurement disconnection protection system |
| CN114088234B (en) * | 2021-11-13 | 2024-04-23 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Industrial thermal resistance temperature measurement broken line protection system |
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Open date: 20090624 |