CN2852221Y - Rotary speed measure control card and its decentralized control system - Google Patents
Rotary speed measure control card and its decentralized control system Download PDFInfo
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- CN2852221Y CN2852221Y CN 200520042028 CN200520042028U CN2852221Y CN 2852221 Y CN2852221 Y CN 2852221Y CN 200520042028 CN200520042028 CN 200520042028 CN 200520042028 U CN200520042028 U CN 200520042028U CN 2852221 Y CN2852221 Y CN 2852221Y
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Abstract
The utility model provides a rotary speed measurement control card and a decentralized control system thereof. The rotary speed measurement control card comprises signal shaping modules, signal sampling calculating modules, a main control module and an alarm relay module, wherein the input end of each signal shaping module is connected with the output end of the rotary speed measurement control card; the input end of each signal sampling calculating module is connected with the output end of one signal shaping module; the input end of the main control module is connected with the output end of each signal sampling calculating module; the input end of the alarm relay module is connected with the output end of the main control module, the alarm relay module is used for acquiring overspeed alarm signals and the rotation speed of a steam turbine is reduced by taking measures when overspeed arises. Besides, the decentralized control system for rotary speed measurement control comprises a rotary speed measurement control card and a bottom board parallel bus, wherein the bottom board parallel bus is connected with the output end of the rotary speed measurement control card. The utility model can accurately and reliably monitor the rotary speed of the steam turbine, when the steam turbine is overspeed, the utility model can take measures to ensure the safety of the steam turbine.
Description
Technical field
The utility model relates to a kind of tachometric survey control card and scattered control system thereof.
Background technology
The SUPMAX800 system is a kind of scattered control system (DCS), is widely used in industry-by-industries such as electric power, metallurgy, petrochemical complex.In the application of these industries, the SUPMAX800 system is through being usually used in digital electric-hydraulic control system (digitalelectro-hydraulic control, vehicle economy H), this system mainly is that the assurance steam turbine can be worked under suitable rotating speed and load condition.Therefore need carry out strict supervision to the rotating speed of steam turbine, and when steam turbine exceeds the speed limit, must make rapid reaction,, influence the safety of the person and equipment in case spline speed is ascended to heaven.
Summary of the invention
The purpose of this utility model is to provide a kind of tachometric survey control card and scattered control system thereof, by the rotating speed of strict monitoring turbine, takes reaction rapidly when hypervelocity takes place, and makes that steam turbine can autostable work.
For reaching above-mentioned purpose, the utility model adopts following technical scheme:
A kind of tachometric survey control card comprises
One or more signal shaping modules, each signal shaping module input links to each other with the output terminal of a tachometric survey control card, is used for the tach signal of sampling is carried out the shaping filter processing;
The signal sampling computing module that equates with Shaping Module quantity, the input end of each signal sampling computing module links to each other with the output terminal of a signal shaping module, and it is used for the signal behind the shaping filter is sampled and calculated rate;
Main control module, the input end of described main control module links to each other with described signal sampling computing module output terminal, its sample described frequency and gather and export after getting intermediate value, when frequency speed went beyond the scope, output overspeed alarming signal was to host computer and alarm relay module; Wherein said host computer is meant that the need that link to each other with main control module obtain the system or equipment of overspeed alarming signal,
The alarm relay module, the input end of alarm relay module links to each other with the output terminal of main control module, and it is used to obtain the overspeed alarming signal, takes measures to reduce turbine speed when hypervelocity.
As a kind of improvement of above-mentioned tachometric survey control card technical scheme, described signal sampling computing module is for sampling to the signal behind the shaping filter and carrying out the module of software filtering calculated rate the time.
As the another improvement of above-mentioned tachometric survey control card technical scheme, the mode that the input end of described signal sampling computing module is isolated by photoelectricity links to each other with the output terminal of a signal shaping module.
As a kind of optimal way of above-mentioned tachometric survey control card technical scheme, the quantity of described signal shaping module be 3.
A kind of tachometric survey control scattered control system, comprise tachometric survey control card and the base plate parallel bus that links to each other with tachometric survey control card output terminal, the rotating speed of steam turbine is calculated in described tachometric survey control card sampling, and export host computer to by the parallel bus of base plate, wherein, host computer is meant that the continuous need of tachometric survey control scattered control system obtain the equipment of rotary speed information, comprise with described tachometric survey control card:
One or more signal shaping modules, each signal shaping module input links to each other with the output terminal of a tachometric survey control card, is used for the tach signal of sampling is carried out the shaping filter processing;
The signal sampling computing module that equates with Shaping Module quantity, the input end of each signal sampling computing module links to each other with the output terminal of a signal shaping module, and it is used for the signal behind the shaping filter is sampled and calculated rate;
Main control module, the input end of described main control module links to each other with described signal sampling computing module output terminal, its sample described frequency and gather and export after getting intermediate value, when frequency speed went beyond the scope, output alarm was to host computer and alarm relay module;
The alarm relay module, the input end of alarm relay module links to each other with the output terminal of main control module, and it is used to obtain the warning overspeed signal, takes measures to reduce turbine speed when hypervelocity.
As a kind of improvement of above-mentioned tachometric survey control scattered control system, described signal sampling computing module is for sampling to the signal behind the shaping filter and carrying out the module of software filtering calculated rate the time.
As the another improvement of above-mentioned tachometric survey control scattered control system, the mode that the input end of described signal sampling computing module is isolated by photoelectricity links to each other with the output terminal of a signal shaping module.
As a kind of optimal way of above-mentioned tachometric survey control scattered control system technical scheme, the quantity of described signal shaping module be 3.
Compared with prior art, the beneficial effects of the utility model are: rotating speed that can accurate and reliable monitoring turbine, and when exceeding the speed limit, can take directly by steam turbine measure rapidly, guaranteed the normal safe handling of steam turbine.
Further specify the utility model below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is the structure principle chart of tachometric survey control card;
Fig. 2 is the structure principle chart of tachometric survey control scattered control system;
Fig. 3 is a signal sampling computing module workflow diagram;
Embodiment
As shown in Figure 1, a kind of tachometric survey control card comprises
Three signal shaping modules 1, each signal shaping module input links to each other with the output terminal of a tachometric survey control card, is used for the rotational speed pulse signal of sampling is carried out the shaping filter processing;
Three signal sampling computing modules 2, the mode that the input end of each signal sampling computing module is isolated by photoelectricity links to each other with the output terminal of a signal shaping module.Its signal after to shaping filter is sampled and is carried out software filtering calculated rate the time;
Three road pulse signals have converted the waveform of TTL to by signal shaping module 1 and have filtered some and disturbed the burr that produces, send into three signal sampling computing modules 2 by the transmission that photoelectricity is isolated, photoelectricity is isolated and to have been guaranteed that on-site signal and control circuit isolate mutually, and is separate.The signal sampling computing module can adopt the single-chip microcomputer of 77E58, can improve precision greatly because the timer of 77E58 can be as accurate as 1/4 of crystal oscillator frequency.By counter and timer, the signal sampling computing module can calculate accurate frequency.Carrying out simple software filtering then further improves precision and filters interference.Gather three frequencies by main control module 3 again and get its intermediate value, so not only guaranteed that signal is more accurately when one road signal fault but also can obtain frequency by other two paths of signals.At this moment notify the staff to check that input signal is to fix a breakdown by changing corresponding alarm bit.Owing to require that the two-way input signal is normal at least,, guaranteed the reliability of signal like this if having only one the tunnel then think insecurely.When frequency surpass rated speed 103% the time high jump report to the police, surpass high warning of high jump in 110% o'clock of rated speed, and by 4 outputs of alarm relay output module.The alarm relay module comprises 2 relay normally open contacts, in hypervelocity 103% and 110% action, makes steam turbine by the deceleration that promptly takes appropriate measures respectively, guarantees the safety of producing.
The tachometric survey control card adopts the independent sampling at high speed of 3 77E58 single-chip microcomputers, and sample rate and precision are guaranteed.Its most of element is the paster mounted on surface, and components and parts are more reliable and more stable, has further improved the stability of tachometric survey control card.It has adopted programmable logical device XC9536, can online programming, and modification logic that can simple and fast provides convenience for revising logic in the future.
Embodiment 2-tachometric survey control scattered control system
As shown in Figure 2, a kind of tachometric survey control scattered control system, comprise tachometric survey control card 5 and the base plate parallel bus 6 that links to each other with tachometric survey control card output terminal, the rotating speed of steam turbine is calculated in described tachometric survey control card sampling, and export host computer to by the parallel bus of base plate, wherein said tachometric survey control card comprises:
Three signal shaping modules, each signal shaping module input links to each other with the output terminal of a tachometric survey control card, is used for the tach signal of sampling is carried out the shaping filter processing;
Three signal sampling computing modules, the mode that the input end of described signal sampling computing module is isolated by photoelectricity links to each other with the output terminal of a signal shaping module.It is used for the signal behind the shaping filter is sampled and calculated rate, carries out software filtering simultaneously.
Main control module, the input end of described main control module links to each other with described signal sampling computing module output terminal, its sample described frequency and gather and export after getting intermediate value, when frequency speed went beyond the scope, output alarm was to host computer and alarm relay module;
The alarm relay module, the input end of alarm relay module links to each other with the output terminal of main control module, and it is used to obtain the warning overspeed signal, takes measures to reduce turbine speed when hypervelocity.
Adopt above-mentioned tachometric survey control card and scattered control system thereof, its application process may further comprise the steps:
1) converts the rotating shaft of steam turbine rotating speed to 3 road pulse signals, and described pulse signal is carried out shaping filter handle;
2) calculate the frequency of described pulse signal, carry out software filtering simultaneously;
3) described frequency is gathered, export after getting intermediate value, when the super scope of frequency, output alarm signal is to the alarm relay module;
4) after the alarm relay module receives alerting signal, the steam turbine hypervelocity is taked the deceleration measure.
Tachometric survey control method of the present utility model realizes by following concrete steps:
At first, the 77E58 of signal sampling computing module comes calculated rate with counter and timer.For the accuracy that guarantees to calculate, in the present embodiment, adopted following method:
As shown in Figure 3,, be 10mS at first with timer settings T1 with the rising edge of pulse signal start time as timing, count simultaneously and timing this moment.Continue timing and stop counting when arriving 10mS when pulse signal rising edge occurs once more, at this moment the waveform of pulse signal is complete, and obtains clocking value T2 and count value n, then by obtaining frequency with following formula:
Frequency=count value/(10mS+ clocking value), i.e. F=n/ (T1+T2)
So in order to obtain the clocking value of response time employing 10mS faster.Because 10mS is shorter, the pulse of Chu Xianing therebetween is about 30～40, if the error of a pulse will influence precision greatly.So adopt the single-chip microcomputer of 77E58,1/4 timer resolution of its crystal oscillator frequency can improve precision greatly, makes timing error be reduced to 0.2uS, promptly 0.2/10000th, make final frequency error be controlled at next yard.
Carry out following simple filtering by software filtering 8 then, method is as follows:
Current frequency values and last twice frequency are taken the mean, and frequency is next time taken the mean as frequency with preceding two frequencies next time again.Though adopt this kind mode response speed to decrease, it can be good at elimination and disturbs, and makes frequency change smoother stable.Thereby further improved precision.
The single-chip microcomputer of main control module obtains each frequency values by the single-chip microcomputer session communication with the signal sampling computing module, method is as follows: because the range of speeds is between the 0---4096, when being converted into scale-of-two be 12, main control module is connected by 8 data lines with the sampling computing module in the present embodiment, therefore transmission at twice.And the computing module of may sampling counting and timing, needs at this moment to wait for that it handles counting earlier and timing comes response session again.Therefore adopt such conversational mode, at first main control module sends request, gives signal of main control module when the sampling computing module just responds this request in the time of the free time, and the low byte of rotating speed is passed to main control module.Receive response when main control module and just begin to accept data.Main control module is asked high byte after harvesting low byte once more.The sampling computing module is secondary response and the high byte of rotating speed is uploaded to main control module again.Main control module is received to respond and is collected high byte.So just, obtained complete rotary speed data.
Then alarm bit 10 is handled and revised to these three frequency signals, specific as follows:
Actual frequency is the intermediate value of these three frequencies, and the precision that can improve frequency like this can guarantee the reliability of signal again, thinks that just it is reliable in the time of promptly must having at least two signals effective, and gets the accuracy that intermediate value can not influence frequency this moment.When one road input signal broke down, corresponding alarm bit can be revised, and the staff can judge which input signal breaks down by these alarm bits and keep in repair.
Software can provide and report to the police 11 when hypervelocity appears in rotating speed, and concrete grammar is as follows:
Surpass the alarm relay of 103% output 103% and 103% alarm bit, surpass at 110% o'clock, export 110% alarm relay and 110% alarm bit again.Make and directly to take measures fast by relay that the staff also can understand present overspeed situation by picture.When rotating speed decline disappeared 110% and 103% warning, the boundary of removing warning was more lower slightly than 110% and 103%, if be the vibration damage relay that fluctuates and produce relay for fear of rotating speed like this near 110% and 103%.
Corresponding data bit and alarm bit see the following form:
| Bit15 | Bit14 | Bit13 | Bit12 | Bit11～Bit00 |
| Err1 | Err0 | HH-ALM | H-ALM | Rotating speed (＜4096) |
● rotating speed position: Bit11～Bit00 (0～4095Cycle/Min.)
● alarm bit: Bit13 Bit12
| Bit13 | Bit12 | Alarm condition |
| 0 | 0 | Alarm free |
| 0 | 1 | 103% reports to the |
| 1 | 0 | 110% reports to the police |
● channel failure position: Bit15 Bit14
| Bit15 | Bit14 | Malfunction |
| 0 | 0 | Three passages are all normal |
| 0 | 1 | |
| 1 | 0 | |
| 1 | 1 | |
In addition, exceed 100 as the tachometer value and other difference of two passages of a certain passage, also declaring this passage has fault.
Below principle of the present utility model is done following description:
The tachometric survey control card is the pulse signal that sends according to turbine speed by receiving sensor, counts and timing in the time of by certain hour, calculates the frequency of pulse.And simultaneously to a steam turbine with three tunnel signal monitorings, guarantee the reliability of its signal.By being gathered, three road signals get its intermediate value.When surpassing 103% and 110%, rotating speed, makes it possible to promptly take measures to reduce turbine speed by the relay output of plank self.The control card of tachometric survey simultaneously uploads to rotary speed data and warning on the SUPMAX800 parallel bus.
Claims (7)
1, a kind of tachometric survey control card is characterized in that: comprise
One or more signal shaping modules, each signal shaping module input links to each other with the output terminal of a tachometric survey control card, is used for the tach signal of sampling is carried out the shaping filter processing;
The signal sampling computing module that equates with Shaping Module quantity, the input end of each signal sampling computing module links to each other with the output terminal of a signal shaping module, and it is used for the signal behind the shaping filter is sampled and calculated rate;
Main control module, the input end of described main control module links to each other with described signal sampling computing module output terminal, its sample described frequency and gather and export after getting intermediate value, when frequency speed goes beyond the scope, output overspeed alarming signal;
The alarm relay module, the input end of alarm relay module links to each other with the output terminal of main control module, and it is used to obtain the overspeed alarming signal, takes measures to reduce turbine speed when hypervelocity.
2, tachometric survey control card according to claim 1 is characterized in that: the quantity of described signal shaping module be 3.
3, tachometric survey control card according to claim 1 and 2 is characterized in that: described signal sampling computing module is for sampling to the signal behind the shaping filter and carrying out the module of software filtering calculated rate the time.
4, tachometric survey control card according to claim 1 and 2 is characterized in that: the mode that the input end of described signal sampling computing module is isolated by photoelectricity links to each other with the output terminal of a signal shaping module.
5, a kind of tachometric survey control scattered control system, it is characterized in that: comprise tachometric survey control card and the base plate parallel bus that links to each other with tachometric survey control card output terminal, the rotating speed of steam turbine is calculated in described tachometric survey control card sampling, and the output of the parallel bus by base plate, wherein said tachometric survey control card comprises:
One or more signal shaping modules, each signal shaping module input links to each other with the output terminal of a tachometric survey control card, is used for the tach signal of sampling is carried out the shaping filter processing;
The signal sampling computing module that equates with Shaping Module quantity, the input end of each signal sampling computing module links to each other with the output terminal of a signal shaping module, and it is used for the signal behind the shaping filter is sampled and calculated rate;
Main control module, the input end of described main control module links to each other with described signal sampling computing module output terminal, its sample described frequency and gather and export after getting intermediate value, when frequency speed goes beyond the scope, output overspeed alarming signal;
The alarm relay module, the input end of alarm relay module links to each other with the output terminal of main control module, and it is used to obtain the overspeed alarming signal, takes measures to reduce turbine speed when hypervelocity.
6, tachometric survey control scattered control system according to claim 5, it is characterized in that: the mode that the input end of described signal sampling computing module is isolated by photoelectricity links to each other with the output terminal of a signal shaping module.
7, according to claim 5 or 6 described tachometric surveies control scattered control systems, it is characterized in that: the quantity of described signal shaping module be 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520042028 CN2852221Y (en) | 2005-05-31 | 2005-05-31 | Rotary speed measure control card and its decentralized control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200520042028 CN2852221Y (en) | 2005-05-31 | 2005-05-31 | Rotary speed measure control card and its decentralized control system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551678B (en) * | 2008-04-03 | 2011-03-30 | 新华威尔液压***(上海)有限公司 | Rotational speed measuring device |
| CN105116712A (en) * | 2015-08-03 | 2015-12-02 | 深圳市芯海科技有限公司 | Method for automatically calibrating built-in crystal oscillator |
| CN105573276A (en) * | 2015-12-25 | 2016-05-11 | 华北电力科学研究院有限责任公司 | Fieldbus information transmission method |
| CN106018867A (en) * | 2015-03-27 | 2016-10-12 | 上海梅山钢铁股份有限公司 | Rotating speed probe switching and restoration device |
-
2005
- 2005-05-31 CN CN 200520042028 patent/CN2852221Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551678B (en) * | 2008-04-03 | 2011-03-30 | 新华威尔液压***(上海)有限公司 | Rotational speed measuring device |
| CN106018867A (en) * | 2015-03-27 | 2016-10-12 | 上海梅山钢铁股份有限公司 | Rotating speed probe switching and restoration device |
| CN106018867B (en) * | 2015-03-27 | 2019-03-26 | 上海梅山钢铁股份有限公司 | Rotational speed probe switching and prosthetic device |
| CN105116712A (en) * | 2015-08-03 | 2015-12-02 | 深圳市芯海科技有限公司 | Method for automatically calibrating built-in crystal oscillator |
| CN105573276A (en) * | 2015-12-25 | 2016-05-11 | 华北电力科学研究院有限责任公司 | Fieldbus information transmission method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20061227 Termination date: 20140531 |