CN103401552A - Function module capable of preventing protection misoperation caused by analog quantity signal hopping - Google Patents
Function module capable of preventing protection misoperation caused by analog quantity signal hopping Download PDFInfo
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- CN103401552A CN103401552A CN2013102747448A CN201310274744A CN103401552A CN 103401552 A CN103401552 A CN 103401552A CN 2013102747448 A CN2013102747448 A CN 2013102747448A CN 201310274744 A CN201310274744 A CN 201310274744A CN 103401552 A CN103401552 A CN 103401552A
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Abstract
The invention relates to a function module capable of preventing protection misoperation caused by analog quantity signal hopping. According to the invention, in allusion to the condition that a power unit trips because of instant hopping of analog quantity signals in the production process, the function module is developed to prevent the protection misoperation caused by signal instant hopping by using a logical configuration function of application software in a DCS computer control system. When instant hopping occurs in the analog quantity signals, the protection function module can retreat the analog quantity signals from a computer control logical operation circuit timely and alarm, thereby being capable of avoiding occurrence of the condition that the equipment trips because of hopping of one analog quantity signal. The protection function module provided by the invention can be widely applied to input circuits of the computer control system.
Description
Technical field
Patent of the present invention relates to and a kind ofly prevents that the analog signals saltus step from causing the functional module of protection malfunction, the application of logic circuit module of specifically utilizing the applied software development in the DCS computer control system to generate.
Background technology
At present; in the application software that DCS computer control system producer provides; generally be designed with analog signals quality arbitration functions; and do not have design to prevent that the analog signals instantaneous abrupt change from causing the logic control circuit of protection malfunction; and in actual production process; due to reasons such as in-site measurement signal abnormal or artificial incorrect operation, caused analog signals instantaneous abrupt change makes the situation of unit tripping happen occasionally, as:
On May 7th, 2011; certain power plant's 350MW unit is at normal operation period; due to the maintainer in maintenance process; cause a feedwater flow transducer signal generation instantaneous abrupt change; this instantaneous abrupt change signal is collected timely in logical circuit and has carried out the control logic computing by the DCS computer control system, thereby has drawn wrong result of calculation, makes steam water-level sharply rise; the action of steam water-level Senior Three value protection, boiler are sent out the urgent blowing out of MFT signal and are shut down.
On April 19th, 2013; certain 660MW of power plant unit maintenance personnel is processing the deaerator level signal once during the door fault; cause the saltus step of two deaerator level signals sharply to rise to the range maximum; moment arrives below zero immediately subsequently; deaerator level sends lower than 600mm steam feed pump guard signal, gets two functional module outputs one through one three and jumps the heat pump signal, due to the heat pump emergency trip; cause boiler water shortage boiler MFT action after certain time delay, the unit emergency trip.
Summary of the invention
The patent technical issues that need to address of the present invention are; overcome the deficiency of background technology; provide a kind of module with defencive function of utilizing the APPLICATION SOFTWARE OF COMPUTER CONTROL SYSTEM exploitation, to prevent causing the accident of operational outfit tripping operation to occur because the analog signals instantaneous abrupt change causes the protection malfunction.
The technical scheme that patent technical solution problem of the present invention adopts be a kind of prevent the analog signals instantaneous abrupt change cause the protection malfunction functional module; comprise: the analog input signal of DCS computer control system, limit value circuit, AND circuit,, OR circuit, not circuit, impulse circuit, delay circuit and rest-set flip-flop circuit; it is characterized in that: in DCS computer control system logical circuit, increase by one and have the analog signals that instantaneous abrupt change in time will occur and withdraw from the protection module in logical operation loop.
The course of work of patent of the present invention is as follows: analog signals after two limit value circuit 1,2, is converted to two switching value signals, and a road is alarm signal, and a road is the trip protection signal.
One. after alarm signal occurs, report to the police immediately, after time delay in 3 seconds, rest-set flip-flop is carried out set, rest-set flip-flop is output as " 1 ", and this functional module will allow the output of trip protection signal, and participates in the computing of control logic loop.
Two. after alarm signal is sent; in 3 seconds delay times; when the trip protection signal also occurs; the trip protection signal has carried out locking with alarm signal in logical circuit; make rest-set flip-flop can not carry out set, the output of rest-set flip-flop is always " 0 ", and the trip protection signal just can not be exported; can not participate in the computing of control logic loop, thereby arrived, prevent that the analog signals saltus step from causing the function of protection malfunction.
Three. when alarm signal and trip protection signal all recover normal after, by time delay after 30 minutes, logical circuit rest-set flip-flop is automatically reset or 30 minutes with interior by resetting manually.
Four. when two limit value circuit all adopted the lower bound circuit, as shown in Figure 4, this functional module was used for the low protection loop of analog signals; When two limit value circuit all adopt high rationing the power supply during road, as shown in Figure 5, this functional module is used for the high protection loop of analog signals.
The beneficial effect of patent of the present invention is: when analog signals generation instantaneous abrupt change, can in time the analog signals that saltus step occurs be isolated, make the signal that saltus step occurs not participate in the loop control logic computing, thereby having avoided reason in some analog signalses to occur moment causes the accident of unit tripping to occur in the signal saltus step, facilitate simultaneously maintainer's maintenance, guaranteed the unit safety economical operation.
Description of drawings
In figure, thick line is analog signals, and fine rule is the switching value signal.
Fig. 1 is the low protection of the deaerator level control principle drawing of conventional design.
Fig. 2 is the low protection of the deaerator level control principle drawing after employing defencive function module, and wherein the hand-reset of defencive function module and alarm terminals need not.
Fig. 3 is defencive function module outline drawing.
Fig. 4 is defencive function module lower bound protection internal circuit diagram.
Fig. 5 is the high limit protection of defencive function module internal circuit diagram.
Embodiment
The embodiment of patent of the present invention is: analog signals is converted to two switching value signals behind two limit value circuit 1 and 2 be alarm signal and trip protection signal, and its concrete connecting circuit is as follows:
Alarm signal is divided into three Lu，Yi roads directly as the alarm output signal of defencive function module; Circuit 1(delay time was connected 3 seconds through a time delay again through AND circuit 1 in one tunnel) after, make the set of rest-set flip-flop S end, rest-set flip-flop output minute two-way, an input of being connected with AND circuit in one tunnel connects, as the input condition that allows the trip protection signal, an input of being connected with AND circuit through not circuit 1 in another road connects, as the condition of cancelling trip protection signal block alarm signal; The Third Road alarm signal is connected connection through a not circuit 3 with AND circuit, the output back of AND circuit 3 connects a time delay open circuit 2(delay time 30 minutes), the output of time delay open circuit 2 is connected through an impulse circuit again, the output of impulse circuit is connected with an OR circuit, the signal that after the output of OR circuit is normal as analog signals, rest-set flip-flop is resetted.
The trip protection signal is divided into another input that three Lu，Yi roads are connected with AND circuit and connects, and connections is connected in the output of AND circuit 2 with not gate, the other end connection that the output of not gate 2 is connected with AND circuit, the block signal during as the signal instantaneous abrupt change; One tunnel NAND gate circuit 4 connects, connection is connected in the output of not circuit 4 with AND circuit, connection is connected again in the output of AND circuit 3 with the time delay open circuit, the output of time delay open circuit 2 is connected with an impulse circuit, the output of impulse circuit is connected the other end and is connected with OR circuit, as another condition that rest-set flip-flop is resetted; Third Road directly is connected the other end as the trip protection signal and is connected with AND circuit.
The hand-reset signal is connected the other end and is connected with OR circuit, the signal that manually rest-set flip-flop is resetted after normal as analog signals.
Claims (4)
1. one kind prevents that the analog signals instantaneous abrupt change from causing the functional module of protection malfunction; comprise: the analog input signal of DCS computer control system, limit value circuit, AND circuit,, OR circuit, not circuit, impulse circuit, delay circuit and rest-set flip-flop circuit; it is characterized in that: in DCS computer control system logical circuit, increase by one and have the analog signals that instantaneous abrupt change in time will occur and withdraw from the defencive function module in logical operation loop.
2. the defencive function module described in claim 1, it is characterized in that: analog signals is converted to two switching value signals behind two limit value circuit 1 and 2 be alarm signal and trip protection signal, wherein alarm signal is divided into three Lu，Yi roads directly as the alarm output signal of defencive function module; One tunnel again after circuit 1 is connected in a time delay, makes the set of rest-set flip-flop S end through AND circuit 1, a rest-set flip-flop output minute two-way, and an input of being connected with AND circuit in a road connects, and an input of being connected with AND circuit through not circuit 1 in another road connects; The Third Road alarm signal is connected connection through a not circuit 3 with AND circuit, the output back of AND circuit 3 connects a time delay open circuit 2, the output of time delay open circuit 2 is connected through an impulse circuit again, the output of impulse circuit is connected with an OR circuit, and the output of OR circuit is connected reset terminal and is connected with rest-set flip-flop.
3. the defencive function module described in claim 1, it is characterized in that: the trip protection signal is divided into three tunnels, another input of being connected with AND circuit in one tunnel connects, and connections is connected in the output of AND circuit 2 with not gate, the other end connection that the output of not gate 2 is connected with AND circuit; One tunnel NAND gate circuit 4 connects, connection is connected in the output of not circuit 4 with AND circuit, connection is connected again in the output of AND circuit 3 with the time delay open circuit, the output of time delay open circuit 2 is connected with an impulse circuit, the output of impulse circuit is connected the other end and is connected with OR circuit, as another condition that rest-set flip-flop is resetted; Third Road directly is connected the other end as the trip protection signal and is connected with AND circuit.
4. the defencive function module described in claim 1 is characterized in that: the hand-reset signal is connected the other end and is connected with OR circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102747448A CN103401552A (en) | 2013-07-02 | 2013-07-02 | Function module capable of preventing protection misoperation caused by analog quantity signal hopping |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013102747448A CN103401552A (en) | 2013-07-02 | 2013-07-02 | Function module capable of preventing protection misoperation caused by analog quantity signal hopping |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108345279A (en) * | 2018-01-29 | 2018-07-31 | 华润电力（海丰）有限公司 | One kind preventing DCS system control logic protection accidentally input coefficient |
| CN108958218A (en) * | 2018-06-27 | 2018-12-07 | 浙江智海化工设备工程有限公司 | A kind of functional module preventing Temperature jump for control system |
| CN112255998A (en) * | 2020-10-27 | 2021-01-22 | 呼伦贝尔安泰热电有限责任公司扎兰屯热电厂 | Quality judgment function block for DCS analog quantity |
| CN113688521A (en) * | 2021-08-25 | 2021-11-23 | 中国核动力研究设计院 | Design method and system for test allowable function of high-reliability reactor protection system |
| CN114999122A (en) * | 2021-03-01 | 2022-09-02 | 国能浙江南浔天然气热电有限公司 | 6F type gas turbine unit fault alarm system |
-
2013
- 2013-07-02 CN CN2013102747448A patent/CN103401552A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108345279A (en) * | 2018-01-29 | 2018-07-31 | 华润电力（海丰）有限公司 | One kind preventing DCS system control logic protection accidentally input coefficient |
| CN108345279B (en) * | 2018-01-29 | 2019-09-03 | 华润电力（海丰）有限公司 | One kind preventing DCS system control logic protection accidentally input coefficient |
| CN108958218A (en) * | 2018-06-27 | 2018-12-07 | 浙江智海化工设备工程有限公司 | A kind of functional module preventing Temperature jump for control system |
| CN112255998A (en) * | 2020-10-27 | 2021-01-22 | 呼伦贝尔安泰热电有限责任公司扎兰屯热电厂 | Quality judgment function block for DCS analog quantity |
| CN114999122A (en) * | 2021-03-01 | 2022-09-02 | 国能浙江南浔天然气热电有限公司 | 6F type gas turbine unit fault alarm system |
| CN113688521A (en) * | 2021-08-25 | 2021-11-23 | 中国核动力研究设计院 | Design method and system for test allowable function of high-reliability reactor protection system |
| CN113688521B (en) * | 2021-08-25 | 2023-06-20 | 中国核动力研究设计院 | High-reliability reactor protection system test permission function design method and system |
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Application publication date: 20131120 |