CN114721320A - Method and device for monitoring temperature protection signal of steam turbine - Google Patents
Method and device for monitoring temperature protection signal of steam turbine Download PDFInfo
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- CN114721320A CN114721320A CN202210462652.1A CN202210462652A CN114721320A CN 114721320 A CN114721320 A CN 114721320A CN 202210462652 A CN202210462652 A CN 202210462652A CN 114721320 A CN114721320 A CN 114721320A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
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- G05B19/048—Monitoring; Safety
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Abstract
The invention discloses a method and a device for monitoring a temperature protection signal of a steam turbine, which comprises the following steps: step 1: collecting temperature protection signal data on line; step 2: judging the quality and the speed of the temperature protection signal, if the measured point is a dead pixel, performing step 3, otherwise, performing step 5; and step 3: rejecting abnormal temperature protection signals, alarming and locking signals; and 4, step 4: after receiving the alarm, the operation and maintenance personnel deal with the fault; after fault processing and signal normality confirmation, resetting the locked signal by operation and maintenance personnel; and 5: and reserving signals which normally participate in corresponding calculation and protection logics. The invention also provides a steam turbine temperature protection signal monitoring device based on the method, which comprises a thermal resistance measuring element, an RTD clamping piece, a configuration module, an alarm device and a display. The reliability of the temperature protection signal is improved, the protection misoperation is reduced, and a reset function is provided to help operation and maintenance personnel to timely input protection and prevent protection failure.
Description
Technical Field
The invention belongs to the field of steam turbine signal monitoring, and particularly relates to a method and a device for monitoring a temperature protection signal of a steam turbine.
Background
A plurality of main protection signals related to temperature are arranged in an ETS protection system of the steam turbine, and the main protection signals comprise water inflow prevention protection, high thrust bearing temperature protection and high support bearing temperature protection and relate to a plurality of temperature protection signal measuring points. The temperatures can effectively reflect whether the steam turbine is in water inlet or not, whether the thrust bearing and the support bearing of the steam turbine work normally or not, and the accurate measurement and processing of the temperatures have important significance for the safe and stable operation of the steam turbine.
The general temperature protection signal monitoring mainly adopts single-point measurement and single-point protection, signals directly participate in calculation and protection without being processed, and when the conditions of temperature element faults, clamping part faults, loose wiring, cable damage, external interference and the like occur, the protection signal misoperation is easily caused, unnecessary main protection tripping of a steam turbine occurs, further the unplanned shutdown is caused, and the economic loss is generated.
Disclosure of Invention
The invention aims to provide a method and a device for monitoring a temperature protection signal of a steam turbine, which aim to solve the problems that signal misoperation is easily caused and loss is generated due to the fact that single-point measurement and single-point protection are used in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for monitoring a temperature protection signal of a steam turbine comprises the following steps:
step 1: collecting temperature protection signals of a plurality of measuring points in the steam turbine;
step 2: performing quality abnormity judgment and rate abnormity judgment on the temperature protection signal acquired in the step 1; if at least one judgment result of the quality abnormity judgment or the rate abnormity judgment of the temperature protection signal is abnormal, performing step 3, otherwise, continuously acquiring the temperature protection signals of a plurality of measuring points in the steam turbine;
when at least one judgment result of the quality abnormity judgment or the rate abnormity judgment of the temperature protection signal is abnormal, the temperature protection signal measuring point is a dead pixel;
and step 3: and rejecting the temperature protection signal with the abnormal judgment result, and sending out an alarm signal and a locking signal.
Preferably, in step 1, the temperature protection signal data includes a metal temperature of a steam inlet area of the high and medium pressure cylinder of the steam turbine, a metal temperature of a steam exhaust area of the high and medium pressure cylinder of the steam turbine, a thrust bearing temperature, and a support bearing temperature.
Preferably, in step 2, when the temperature protection signal is not within the preset temperature value range, the signal measuring point is judged to be a dead pixel, and the temperature protection signal is judged to be an abnormal signal;
when the temperature protection signal shows that the signal measurement loop is open-circuited, judging that the temperature protection signal is an abnormal signal;
and when the rising speed or the falling speed of the temperature protection signal in the temperature protection signal exceeds a preset threshold value, judging the temperature protection signal as an abnormal signal.
Preferably, in step 3, the temperature protection signal having the abnormal determination result is latched by the R/S flip-flop.
Preferably, in step 3, the alarm signal includes an alarm device sound alarm and a display pop-up window alarm.
Preferably, the method also comprises the step 4: and analyzing and processing the fault reason, and resetting the locked signal by the R/S trigger after the signal is confirmed to be normal.
Preferably, the method further comprises a step 5 of reserving and outputting the temperature protection signals of the plurality of normal measuring points.
Preferably, in step 2, if the determination results of the temperature protection signal in the quality abnormality determination and the rate abnormality determination are both normal, the process proceeds to step 5.
A temperature protection signal monitoring device for a steam turbine comprises a thermal resistance measuring element, an RTD (real time detection) clamping piece, a configuration module and an alarm device;
the thermal resistance measuring element is connected with an RTD clamping piece through a control cable, the RTD clamping piece is connected with a configuration module, and the configuration module is connected with an alarm device;
the configuration module comprises an R/S trigger, a quality judgment comparator and a speed judgment comparator; the RTD clamping piece is connected with the input end of a quality judgment comparator and the input end of a speed judgment comparator, the output end of the quality judgment comparator and the output end of the speed judgment comparator are connected with the input end of an R/S trigger, and the first output end of the R/S trigger is connected with an alarm device;
the thermal resistance measuring element is matched with the RTD clamping piece and is used for acquiring temperature protection signals of a plurality of measuring points in the steam turbine;
the quality judgment comparator is used for judging the quality abnormity of the collected temperature protection signal; the speed judgment comparator is used for carrying out speed abnormity judgment on the acquired temperature protection signal; if at least one judgment result of the quality abnormity judgment or the rate abnormity judgment of the temperature protection signal is abnormal, the corresponding temperature protection signal measuring point is a dead pixel; and rejecting the temperature protection signal with the abnormal judgment result, sending an alarm signal to an alarm device, and sending a locking signal to an R/S trigger.
Preferably, the alarm device further comprises a display, the second output end of the R/S trigger is connected with the display, and the alarm device is connected with the display.
The invention has the advantages that:
a plurality of measuring points are arranged on the steam turbine, abnormal signals are eliminated and locked by using the quality judgment comparator and the speed judgment comparator, and an alarm is given out, so that the reliability of temperature protection signals is improved, the protection misoperation of the steam turbine is reduced, and the unplanned shutdown and unnecessary economic loss are avoided under the condition that the working condition of the steam turbine is normal;
and a reset function is provided, and the alarm signal is reset in time through the R/S trigger and is put into calculation and protection again, so that the protection is prevented from being refused.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a method for monitoring a turbine temperature protection signal.
Fig. 2 is a schematic structural diagram of a steam turbine temperature protection signal monitoring device.
FIG. 3 is a schematic diagram of an exemplary application of a turbine temperature protection signal monitoring device.
In the figure, 1 is a steam turbine; 2 is a thermal resistance temperature measuring element; 3 is RTD card; 4 is a configuration module; 5 is an alarm device; 6 is a display; 7 is a power cable; 8 is an engineer station; 9 is an operator station; 10 is an R/S trigger; 11 is a quality judgment comparator; and 12 is a rate judging comparator.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
Example 1:
referring to fig. 2, the present invention provides a steam turbine temperature protection signal monitoring device, which includes a thermal resistance measuring element 2, an RTD card 3, a configuration module 4, an alarm device 5, and a display 6;
thermal resistance measuring element 2 passes through control cable 7 and connects RTD fastener 3, and RTD fastener 3 connects configuration module 4, and alarm device 5 and display 6 are connected to configuration module, and alarm device 5 connects display 6 to show alarm signal, configuration module 4 with temperature protection signal transmission to display 6, show temperature real-time data and temperature historical data.
The configuration module comprises an R/S trigger 10, a quality judgment comparator 11 and a speed judgment comparator 12; the RTD clamping piece 3 is connected with the input end of a quality judgment comparator 11 and the input end of a speed judgment comparator 12, the output end of the quality judgment comparator 11 and the output end of the speed judgment comparator 12 are connected with the input end of an R/S trigger 10, the first output end of the R/S trigger 10 is connected with an alarm device 5, the second output end of the R/S trigger 10 is connected with a display 6, and the alarm device 5 is connected with the display 6.
There may be a plurality of thermal resistance temperature measurement elements 2, which are arranged at different measuring points in the device and all transmit the temperature protection signal to the RTD card 3 through the control cable 7.
The RTD clamping piece 3 sends the processed temperature protection signal to the configuration module 4, the quality judgment comparator 11 and the speed judgment comparator 12 compare the temperature protection signal from the RTD clamping piece 3 with a preset threshold value, when the display result of any comparator is abnormal, the temperature display signal is judged to be an abnormal signal, the signal is rejected, the R/S trigger 10 locks the signal, the configuration module 4 sends out a signal to the alarm device 5, the alarm device gives out a sound alarm, and the signal is transmitted to the display 6 to give out a pop-up alarm.
When the temperature protection signal is judged to be a normal signal, the temperature protection signal is transmitted to the display through the R/S trigger.
After the abnormal condition is handled, the R/S flip-flop 10 resets the latched signal, and the reset normal signal is transmitted to the display 6.
The display 6 displays a normal signal, and operation and maintenance personnel can check the real-time temperature value and the historical trend.
Example 2:
referring to fig. 1, the present invention provides a method for monitoring a temperature protection signal of a steam turbine, comprising the following steps:
step 1: acquiring temperature protection signal data of a plurality of measuring points in the steam turbine on line; the method comprises the steps of measuring the metal temperature of a steam inlet area of a high and medium pressure cylinder of the steam turbine, the metal temperature of a steam exhaust area of the high and medium pressure cylinder of the steam turbine, the temperature of a thrust bearing and the temperature of a support bearing, and displaying real-time data in a centralized manner through an HMI (human machine interface) picture;
step 2: the quality judgment module is used for carrying out quality judgment on the temperature protection signal, and when the signal is not in a preset temperature value range (such as 0-200 ℃), or a signal measurement loop is opened due to temperature element faults, clamping part faults, signal cable breakage and the like, the temperature protection signal is judged to be an abnormal signal;
the method comprises the steps of utilizing a rate change judging module to judge rate change of a temperature protection signal, setting a rate limit value by combining with actual working conditions, judging that the rate change of the temperature protection signal is abnormal when the temperature protection signal changes over the limit value, for example, setting the rate limit value to be 250 ℃/s, setting the system sampling period of an embodiment to be 40ms, namely, the temperature change in one sampling period rises or falls over 10 ℃, and judging that the temperature protection signal is an abnormal signal;
if the temperature protection signal is an abnormal signal, determining that the temperature protection signal measuring point is a dead pixel, and performing step S3; otherwise, go to step S5;
and step 3: rejecting the temperature protection signal which is judged to be abnormal information in the step S2, locking the temperature protection signal by adopting an R/S trigger, and carrying out sound alarm through an alarm device 5; the alarm device 5 transmits a signal to the display 6, and the display 6 gives an alarm by popping windows.
Remote data transmission can also be utilized to send information to alarm at the mobile terminal;
and 4, step 4: after receiving the alarm, the operation personnel and the maintenance personnel carry out fault analysis and processing in time; fault processing and signal normality confirmation, and resetting the locked signal by an operation and maintenance worker through a button of the R/S trigger;
and 5: the normal signal is retained and participates in the relevant calculation and protection logic, including calculation, alarm, trip.
Example 3:
as shown in fig. 3, the present device is applied to the bearing position of a steam turbine.
Thermal resistance temperature measurement element 2 is used for measuring the turbine 1 bearing temperature, installs in turbine 1 bearing department, through control cable 7 with temperature protection signal transmission to RTD fastener 3 in.
The RTD card 3 sends the processed temperature protection signal to the configuration module 4, the quality judgment and the speed judgment of the temperature protection signal are carried out through the quality judgment comparator 11 and the speed judgment comparator 12, the abnormal signal is locked through the R/S contactor, and the recovered locking signal is reset.
The configuration module 4 is installed in an engineer station 8.
The alarm device 5 receives the signals from the configuration module 4, performs sound alarm on abnormal temperature quality, abnormal temperature rate change and locking information, and sends signals to the display 6 to perform popup alarm.
The display 6 displays the temperature protection signal from the configuration module 4, and the operation and maintenance personnel can check the real-time temperature value and the historical trend.
The alarm device 5 and the display 6 are mounted at the operator station 9.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (10)
1. A method for monitoring a temperature protection signal of a steam turbine is characterized by comprising the following steps:
step 1: collecting temperature protection signals of a plurality of measuring points in the steam turbine;
and 2, step: performing quality abnormity judgment and rate abnormity judgment on the temperature protection signal acquired in the step 1; if at least one judgment result of the quality abnormity judgment or the rate abnormity judgment of the temperature protection signal is abnormal, performing step 3, otherwise, continuously acquiring the temperature protection signals of a plurality of measuring points in the steam turbine;
when at least one judgment result of the quality abnormity judgment or the rate abnormity judgment of the temperature protection signal is abnormal, the temperature protection signal measuring point is a dead pixel;
and step 3: and rejecting the temperature protection signal with the abnormal judgment result, and sending out an alarm signal and a locking signal.
2. The method for monitoring a temperature protection signal of a steam turbine according to claim 1, wherein in step 1, the temperature protection signal data comprises a metal temperature of a steam inlet area of a high and medium pressure cylinder of the steam turbine, a metal temperature of a steam exhaust area of a high and medium pressure cylinder of the steam turbine, a thrust bearing temperature and a support bearing temperature.
3. The method for monitoring the temperature protection signal of the steam turbine according to claim 1, wherein in step 2, when the temperature protection signal is not within the preset temperature value range, the signal measuring point is judged to be a dead pixel, and the temperature protection signal is judged to be an abnormal signal;
when the temperature protection signal shows that the signal measurement loop is open-circuited, judging that the temperature protection signal is an abnormal signal;
and when the rising speed or the falling speed of the temperature protection signal in the temperature protection signal exceeds a preset threshold value, judging the temperature protection signal as an abnormal signal.
4. The turbine temperature protection signal monitoring method according to claim 1, wherein in step 3, the temperature protection signal judged to be abnormal is latched by an R/S flip-flop (10).
5. A turbine temperature protection signal monitoring method according to claim 1, wherein in step 3, said alarm signal comprises an alarm device (5) audible alarm and a display (6) pop-up alarm.
6. The method of monitoring a turbine temperature protector signal of claim 1 further comprising the step of 4: and analyzing and processing the failure reason of the dead pixel, and resetting the locked signal by the R/S trigger (10) after the signal is confirmed to be normal.
7. The method for monitoring the temperature protection signal of the steam turbine according to claim 6, further comprising a step 5 of keeping and outputting the temperature protection signals of the plurality of normal measuring points.
8. The turbine temperature protection signal monitoring method according to claim 7, wherein in step 2, if the judgment results of the temperature protection signal in the quality abnormality judgment and the rate abnormality judgment are both normal, step 5 is performed.
9. A temperature protection signal monitoring device of a steam turbine is characterized by comprising a thermal resistance measuring element (2), an RTD (real time device) clamping piece (3), a configuration module (4) and an alarm device (5);
the thermal resistance measuring element (2) is connected with RTD clamping pieces (3) through a control cable (7), the RTD clamping pieces (3) are connected with a configuration module (4), and the configuration module (4) is connected with an alarm device (5);
the configuration module (4) comprises an R/S trigger (10), a quality judgment comparator (11) and a speed judgment comparator (12); the RTD clamping piece is connected with the input end of a quality judgment comparator (11) and the input end of a speed judgment comparator (12), the output end of the quality judgment comparator (11) and the output end of the speed judgment comparator (12) are connected with the input end of an R/S trigger (10), and the first output end of the R/S trigger (10) is connected with an alarm device (5);
the thermal resistance measuring element (2) is matched with the RTD clamping piece (3) and is used for collecting temperature protection signals of a plurality of measuring points in the steam turbine;
the quality judgment comparator (11) is used for judging the quality abnormity of the collected temperature protection signals; the speed judgment comparator (12) is used for carrying out speed abnormity judgment on the collected temperature protection signals; if at least one judgment result of the quality abnormity judgment or the rate abnormity judgment of the temperature protection signal is abnormal, the corresponding temperature protection signal measuring point is a dead pixel; and rejecting the temperature protection signal with an abnormal judgment result, sending an alarm signal to an alarm device (5), and sending a locking signal to an R/S trigger (10).
10. A turbine temperature protection signal monitoring device according to claim 9, further comprising a display (6), wherein the second output terminal of the R/S trigger (10) is connected to the display (6), and the alarm device (5) is connected to the display (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210462652.1A CN114721320A (en) | 2022-04-28 | 2022-04-28 | Method and device for monitoring temperature protection signal of steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210462652.1A CN114721320A (en) | 2022-04-28 | 2022-04-28 | Method and device for monitoring temperature protection signal of steam turbine |
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| Publication Number | Publication Date |
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| CN114721320A true CN114721320A (en) | 2022-07-08 |
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| CN202210462652.1A Pending CN114721320A (en) | 2022-04-28 | 2022-04-28 | Method and device for monitoring temperature protection signal of steam turbine |
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| CN (1) | CN114721320A (en) |
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- 2022-04-28 CN CN202210462652.1A patent/CN114721320A/en active Pending
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