CN204028648U - A kind of thermal power plant control system temperature breaking protection logical connection structure - Google Patents
A kind of thermal power plant control system temperature breaking protection logical connection structure Download PDFInfo
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- CN204028648U CN204028648U CN201420148031.7U CN201420148031U CN204028648U CN 204028648 U CN204028648 U CN 204028648U CN 201420148031 U CN201420148031 U CN 201420148031U CN 204028648 U CN204028648 U CN 204028648U
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Abstract
The utility model provides a kind of thermal power plant control system temperature breaking protection logical connection structure, the input end of temperature detector output terminal access value simultaneously decision block one, signal behavior block, difference block, value decision block two and function decision block five functional modules; The input S that difference block output terminal series value decision block three accesses to rest-set flip-flop holds, and connect delay pulse block one and the input R accessing to rest-set flip-flop of value decision block two holds; Two output terminals of value decision block one access to respectively delay pulse block two and with door block, and the output terminal of delay pulse block two accesses to the input end with door block equally; The output terminal of rest-set flip-flop and function decision block is connected respectively after not gate block two and not gate block one and is accessed to the input end with door block; The input end of guard signal dispensing device is accessed to the output terminal of door block.
Description
Technical field
The utility model relates to a kind of thermal power plant control system temperature breaking protection logical connection structure.
Background technology
The steam turbine of large-size thermal power plant, important rotation subsidiary engine all need to monitor its parameter such as bearing temperature, motor temperature; judge that whether the running status of steam turbine, subsidiary engine is normal by temperature point; in order to ensure device security; the bearing temperature of steam turbine, Thrust-vectoring nozzle, the motor temperature of rotation subsidiary engine, bearing temperature all list protection system in; all protection act is had once temperature is too high; make steam turbine or breaker trip, thus avoid device damage.
Prevent false protection in general relay protective scheme the most reliably, the measure of tripping adopts three to get two relay protective scheme exactly, namely at same position, three measuring points are installed, in the middle of three measuring points any two when reaching protection act, protection act.Any point fault all can not cause false protection or tripping.
And steam turbine bearing temperature, Thrust-vectoring nozzle, Important Auxiliaries etc. cannot install three measuring points because of same position, what multiple temperature was all measured is diverse location temperature, cannot get two logics to ensure by three the reliability of protection.So at present steam turbine bearing temperature, Thrust-vectoring nozzle, subsidiary engine bearing temperature etc. are single-point protection, namely any one temperature is higher than protection definite value, and protection will action, and steam turbine or Important Auxiliary equipment will trip.
If single measuring point breaks down or wiring loosens, false protection or tripping will be caused.False protection can cause equipment or unit outage, causes unnecessary economic loss; Relay fail can cause device damage, even personal injury occurs.Current large-scale thermal power machine group all adopts DCS system to control.The symphonyDCS control system of Beijing ABB AB has application widely at home, abroad.In order to avoid the mistake action and rejecting action of temperature single-point protection in its logic, devise temperature breaking protection, its logic connects as shown in Figure 1, temperature detector 101 output terminal is cut-in temperature decision block 1 simultaneously, hysteresis block 203, ask the input end of poor functional block 204 and Quality estimation block 207, output terminal access delay block 205 and the input end with door 2 211 simultaneously of temperature decision block 1, the output terminal of time delay block 205 accesses to the input end with door 1, the output terminal of fixed value transmission block 202 also accesses to the input end of hysteresis block 203, the output terminal of hysteresis block 203 accesses to the input end asking poor functional block 204, ask poor functional block 204 output terminal serial temperature decision block 2 206 successively, the input end with door 1 is accessed to after not gate 1, the input end with door 1 is accessed to after the output terminal series connection not gate 2 209 of Quality estimation block 207, with the output terminal of door 1 and the input end of door 2 211, guard signal dispensing device 102 is connected with the output terminal of door 2 211, wherein:
Temperature decision block 1 be input temp higher than setting value time, output is 1, and setting value is generally 113;
Fixed value sends block 202 and exports as fixed value, and fixed value is generally 1;
Hysteresis block 203 is export the input value after setting-up time, and setting-up time is generally 20 seconds;
Poor functional block 204 is asked to be the difference that output two inputs between end value;
Time delay block 205 is for export input value 1 time delay after 2 seconds;
Temperature decision block 2 206 is for exporting 1 when input value is greater than setting value, and setting value is generally 20;
Quality estimation block 207 is for exporting 1 when input value is bad quality;
Not gate 1, not gate 2 209, for accessing signal reversion, export 0 when being input as 1, export 1 when being input as 0;
With door 1, export 1 with door 2 211 for whole input end is input as 1, any input end is input as 0 and exports 0;
Its Logic judgment principle as shown in Figure 2, temperature detector 101 detects temperature signal T1, exit protection under three circumstances, temperature signal fault is avoided to cause false protection, first two situation is, when T1 becomes bad quality or exit protection during saltus step within having 2 seconds, the third situation is the temperature value that T1 exports, subtract each other with the value of itself after 20 seconds, when deviation is greater than 20 degrees Celsius, temperature decision block 2 206 exports 1, not gate 1 exports 0, because not gate 1 is 0, so export 0 with door 1, so export 0 with door 2 211, if now T1 is greater than 113 degrees Celsius of temperature decision block 1 setting, deliver to the input end with door 2 211, with door 2 211 because be 0 with door 1, also 1 can not be exported, also protection act is not had.
Namely, when the T1 definite value deviation of delayed with it 20 seconds is greater than 20, temperature protection exits automatically.Because temperature is slow signal, when temperature signal deviation in 20 seconds exists 20 degrees Celsius, now thinks that temperature is bad point, automatically exit protection, prevent false protection.
But once temperature signal generation saltus step, more than certain normal value saltus step to 113 degree Celsius, and remain on this value always; after several 20 seconds; because T1 remains on more than 113 degrees Celsius always, can be less than 20 degrees Celsius by this Logic judgment delayed 20 seconds deviations, namely Logic judgment temperature is normal; temperature decision block 2 206 exports 0; not gate 1 exports 1, because not gate 1 is 1, so export 1 with door 1; so export 1 with door 2 211, cause protection misoperation.
Therefore, when this logic cannot avoid temperature signal to break down, after saltus step, remain on the false protection phenomenon in high value situation always.
Utility model content
For solving the problems of the technologies described above; the utility model provides a kind of thermal power plant control system temperature breaking protection logical connection structure; this thermal power plant's control system temperature breaking protection logical connection structure redesigns by connecting logic; except having all functions of former temperature breaking protection concurrently; also avoid the leak of former temperature breaking protection logic; realize the protection exit function of temperature signal fault in any case, stop false protection phenomenon.
The utility model is achieved by the following technical programs.
A kind of thermal power plant control system temperature breaking protection logical connection structure that the utility model provides, the input end of temperature detector output terminal access value simultaneously decision block one, signal behavior block, difference block, value decision block two and function decision block five functional modules; The input S that difference block output terminal series value decision block three accesses to rest-set flip-flop holds, and connect delay pulse block one and the input R accessing to rest-set flip-flop of value decision block two holds; Two output terminals of value decision block one access to respectively delay pulse block two and with door block, and the output terminal of delay pulse block two accesses to the input end with door block equally; The output terminal of rest-set flip-flop and function decision block is connected respectively after not gate block two and not gate block one and is accessed to the input end with door block; The input end of guard signal dispensing device is accessed to the output terminal of door block;
Wherein:
(1) temperature detector: temperature is detected, and detected value is sent;
(2) guard signal dispensing device: receive access signal and then exit defencive function;
(3) value decision block one: judge the detected value received, is greater than setting value s1 and then exports 1;
(4) signal behavior block: rough handling is carried out to the detected value received, and the signal after rough handling is sent;
(5) difference block: two values received are asked poor, and difference result is sent;
(6) value decision block two: judge the value received, is less than setting value s2 and then exports 1;
(7) delay pulse block one: time delay to the received signal sends;
(8) value decision block three: judge the value received, is greater than setting value s3 and then exports 1;
(9) function decision block: judge signal quality, is judged as that bad quality then exports 1;
(10) not gate block one: will access signal reversion, exports 0 when being input as 1, exports 1 when being input as 0;
(11) rest-set flip-flop: when R holds the input 1 of input 0, S end, then export 0, when R holds the input 0 of input 1, S end, then exports 1;
(12) delay pulse block two: time delay to the received signal sends;
(13) not gate block two: will access signal reversion, exports 0 when being input as 1, exports 1 when being input as 0;
(14), with door block: all input end is input as 1 and exports 1, any input end is input as 0 and exports 0.
The setting value s1 of described value decision block one is 130.
The setting value s2 of described value decision block two is 110.
The setting value s3 of described value decision block three is 5.
The setting time delay of described delay pulse block one is 10 seconds.
The setting time delay of described delay pulse block two is 2 seconds.
The rough handling of described signal behavior block is that the value received is postponed a signal scan cycle.
A described signal scan cycle is 0.25 second.
The beneficial effects of the utility model are: except having all functions of former temperature breaking protection concurrently, also avoid the leak of former temperature breaking protection logic, realize the protection exit function of temperature signal fault in any case, stopped false protection phenomenon.Simultaneously; add temperature signal normal after automatic input defencive function; achieve and prevent relay fail phenomenon, solve the steam turbine of large-size thermal power plant, the malfunction of its single-point such as bearing temperature, motor temperature of important rotation subsidiary engine protection, tripping problem, ensure that device security.
Accompanying drawing explanation
Fig. 1 is the logic schematic diagram of prior art.
Fig. 2 is the connection diagram of prior art.
Fig. 3 is logic schematic diagram of the present utility model.
Fig. 4 is connection diagram of the present utility model.
In figure: 101-temperature detector, 102-guard signal dispensing device, 201-temperature decision block one, 202-fixed value sends block, 203-hysteresis block, 204-asks poor functional block, 205-time delay block, 206-temperature decision block two, 207-Quality estimation block, 208-not gate one, 209-not gate two, 210-and door one, 211-and door two, 301-value decision block one, 302-signal behavior block, 303-difference block, 304-value decision block two, 305-delay pulse block one, 306-value decision block three, 307-function decision block, 308-not gate block one, 309-RS trigger, 310-delay pulse block two, 311-not gate block two, 312-and door block.
Embodiment
Further describe the technical solution of the utility model below, but described in claimed scope is not limited to.
A kind of thermal power plant control system temperature breaking protection logical connection structure as shown in Figure 4, temperature detector 101 output terminal access value simultaneously decision block 1, signal behavior block 302, difference block 303, value decision block 2 304 and the input end of function decision block 307 5 functional modules; The input S that difference block 303 output terminal series value decision block 3 306 accesses to rest-set flip-flop 309 holds, and value decision block 2 304 is connected delay pulse the block 1 and input R that accesses to rest-set flip-flop 309 holds; Two output terminals of value decision block 1 access to respectively delay pulse block 2 310 and with door block 312, and the output terminal of delay pulse block 2 310 accesses to the input end with door block 312 equally; The output terminal of rest-set flip-flop 309 and function decision block 307 is connected respectively after not gate block 2 311 and not gate block 1 and is accessed to the input end with door block 312; The input end of guard signal dispensing device 102 is accessed to the output terminal of door block 312;
Wherein:
(1) temperature detector 101: temperature is detected, and detected value is sent;
(2) guard signal dispensing device 102: receive access signal and then exit defencive function;
(3) value decision block 1: judge the detected value received, is greater than setting value s1 and then exports 1;
(4) signal behavior block 302: rough handling is carried out to the detected value received, and the signal after rough handling is sent;
(5) difference block 303: two values received are asked poor, and difference result is sent;
(6) value decision block 2 304: judge the value received, is less than setting value s2 and then exports 1;
(7) delay pulse block 1: time delay to the received signal sends;
(8) value decision block 3 306: judge the value received, is greater than setting value s3 and then exports 1;
(9) function decision block 307: judge signal quality, is judged as that bad quality then exports 1;
(10) not gate block 1: will access signal reversion, exports 0 when being input as 1, exports 1 when being input as 0;
(11) rest-set flip-flop 309: when R holds the input 1 of input 0, S end, then export 0, when R holds the input 0 of input 1, S end, then exports 1;
(12) delay pulse block 2 310: time delay to the received signal sends;
(13) not gate block 2 311: will access signal reversion, exports 0 when being input as 1, exports 1 when being input as 0;
(14), with door block 312: all input end is input as 1 and exports 1, any input end is input as 0 and exports 0.
The setting value s1 of described value decision block 1 is 130.
The setting value s2 of described value decision block 2 304 is 110.
The setting value s3 of described value decision block 3 306 is 5.
The setting time delay of described delay pulse block 1 is 10 seconds.
The setting time delay of described delay pulse block 2 310 is 2 seconds.
The rough handling of described signal behavior block 302 is that the value received is postponed a signal scan cycle.
A described signal scan cycle is 0.25 second.
Be illustrated in figure 3 logic schematic diagram of the present utility model, the temperature value t1 that temperature detector 101 output detections arrives, exit protection under three circumstances, temperature signal fault is avoided to cause false protection, first two situation is that t1 is when becoming bad quality or exit protection during saltus step within having 2 seconds, the third situation is the temperature value that t1 exports, subtract each other with the value of itself after a scan period of DCS system, when deviation is greater than 5 degrees Celsius, value decision block 3 306 exports 1, rest-set flip-flop 309 exports 1, because rest-set flip-flop 309 is 1, so not gate block 2 311 exports 0, so export 0 with door block 312, if now t1 is greater than 130 degrees Celsius of value decision block 1 setting, deliver to the input end with door block 312, with door block 312 because not gate block 2 311 is 0, also 1 can not be exported, also protection act is not had.
T1 and the realization of subtracting each other function from value after a scan period of DCS system: t1 self ask deviation with its value after signal behavior block 302, in fact exactly with a scan period after value ask deviation, the DCS system scan period is 250 milliseconds.General in t1 normal condition; this deviation is less than ± 0.5; also can not exceed when temperature signal increases fast or reduces ± 3; therefore this definite value is set to 5; once t1, in front and back, a scan period deviation is greater than 5, illustrates that t1 breaks down, has hopping phenomenon; exit protection, avoid temperature protection malfunction.
If saltus step occurs t1, to rest-set flip-flop 309 after value decision block 3 306 exports 1, making it export is 1, exits temperature protection.If now t1 is in malfunction always, because rest-set flip-flop 309 has maintenance function, now protects and be in exit status always, can avoid remaining on after Temperature jump in former design temperature relay protective scheme the leak of the false protection phenomenon in high value situation always.
The utility model also has protection automatically to drop into function in addition; when t1 recovers normal; its value is less than the s2(110 degree Celsius of value decision block 2 304, and this value is the alarming value of t1) time, value decision block 2 304 exports 1; 10 pulse per second (PPS)s are sent after delay pulse block 1; the R end of input rest-set flip-flop 309, makes rest-set flip-flop 309 reset, and namely rest-set flip-flop 309 exports is 0; it is 1 that not gate block 2 311 exports, and temperature protection drops into automatically.
Thus, in terms of existing technologies, the utility model asks the function of deviation by the temperature signal that mainly realizes with signal behavior block 302 and himself value after a scan period, mainly realize protecting in temperature breaking protection logic automatically dropping into function with rest-set flip-flop 309, by new temperature breaking protection logic, in fuel-burning power plant, every platform unit at least can save 500,000 yuan: according to a unit, non-stopping occurs once every year and calculate, non-electricity about 1,000,000 kilowatt hour of stopping losing of single unit single, rate for incorporation into the power network: 0.385 yuan/kilowatt hour, single unit single non-brennschluss oil loss: 20 tons, fuel oil unit price: 0.8 ten thousand yuan/ton, i.e. fuel loss 20 tons × 0.8 ten thousand yuan/ton=160,000 yuan, electric quantity loss 1,000,000 kilowatts × ten thousand yuan, 0.385 yuan/kilowatt hour=38.5, separate unit machine single is non-stops loss 160,000 yuan+38.5 ten thousand yuan=54.5 ten thousand yuan altogether, and this statistics does not calculate great subsidiary engine, small machine, the bearing shell scaling loss such as blower fan, the expenses such as electric quantity loss.
Claims (8)
1. thermal power plant's control system temperature breaking protection logical connection structure, is characterized in that: the input end of temperature detector (101) output terminal access value simultaneously decision block one (301), signal behavior block (302), difference block (303), value decision block two (304) and function decision block (307) five functional modules; The input S that difference block (303) output terminal series value decision block three (306) accesses to rest-set flip-flop (309) holds, and value decision block two (304) is connected delay pulse block one (305) and the input R that accesses to rest-set flip-flop (309) holds; Two output terminals of value decision block one (301) access to respectively delay pulse block two (310) and with door block (312), and the output terminal of delay pulse block two (310) accesses to the input end with door block (312) equally; The output terminal of rest-set flip-flop (309) and function decision block (307) is connected respectively after not gate block two (311) and not gate block one (308) and is accessed to the input end with door block (312); The input end of guard signal dispensing device (102) is accessed to the output terminal of door block (312).
2. thermal power plant as claimed in claim 1 control system temperature breaking protection logical connection structure, is characterized in that: the setting value s1 of described value decision block one (301) is 130.
3. thermal power plant as claimed in claim 1 control system temperature breaking protection logical connection structure, is characterized in that: the setting value s2 of described value decision block two (304) is 110.
4. thermal power plant as claimed in claim 1 control system temperature breaking protection logical connection structure, is characterized in that: the setting value s3 of described value decision block three (306) is 5.
5. thermal power plant as claimed in claim 1 control system temperature breaking protection logical connection structure, is characterized in that: the setting time delay of described delay pulse block one (305) is 10 seconds.
6. thermal power plant as claimed in claim 1 control system temperature breaking protection logical connection structure, is characterized in that: the setting time delay of described delay pulse block two (310) is 2 seconds.
7. thermal power plant as claimed in claim 1 control system temperature breaking protection logical connection structure, is characterized in that: the rough handling of described signal behavior block (302) is that the value received is postponed a signal scan cycle.
8. thermal power plant as claimed in claim 7 control system temperature breaking protection logical connection structure, is characterized in that: a described signal scan cycle is 0.25 second.
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Cited By (2)
| 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 |
| 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 |
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2014
- 2014-03-28 CN CN201420148031.7U patent/CN204028648U/en not_active Expired - Fee Related
Cited By (3)
| 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 |
| 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 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141217 |