GB2274538A - Indicator device - Google Patents
Indicator device Download PDFInfo
- Publication number
- GB2274538A GB2274538A GB9406418A GB9406418A GB2274538A GB 2274538 A GB2274538 A GB 2274538A GB 9406418 A GB9406418 A GB 9406418A GB 9406418 A GB9406418 A GB 9406418A GB 2274538 A GB2274538 A GB 2274538A
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- Prior art keywords
- alarm
- operator
- display
- sensor
- information
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Classifications
-
- 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
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0259—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the response to fault detection
- G05B23/0267—Fault communication, e.g. human machine interface [HMI]
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/14—Central alarm receiver or annunciator arrangements
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D3/00—Control of nuclear power plant
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D3/00—Control of nuclear power plant
- G21D3/04—Safety arrangements
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D3/00—Control of nuclear power plant
- G21D3/008—Man-machine interface, e.g. control room layout
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Automation & Control Theory (AREA)
- Testing And Monitoring For Control Systems (AREA)
Description
2274538 INDICATOR DEVICE This invention relates to an indicator device for
a plant operating parameter. it could for example be used in connection with the control of operation of a commercial 5 nuclear power plant.
Conventionally, commercial nuclear power plants have a central control room containing equipment by which the operator collects, detects, reads, compares, copies, computes, compiles, analyzes, confirms, monitors, and/or verifies many bits of information from multiple indicators and alarms. Conventionally, the major operational systems in the control room have been installed and operate somewhat independently. These include the monitoring function, by which the components and the various processes in the plant are monitored; control, by which the components and the processes are intentionally altered or adjusted, and protection, by which a threat to the safety of the plant is identified and corrective measures immediately taken.
The result of such conventional control room arrangement and functionality can sometimes by information overload or stimulus overload on the operator. That is, the amount of information and the variety and complexity of the equipment available to the operator for taking action based on such extensive information, can exceed the operator's cognitive limits, resulting in errors.
The most famous example of the inability of operators to assimilate and act correctly based on the tremendous volume of information stimuli in the control room, particularly during unexpected or unusual plant transients, is the accident that occurred in 1978 at the Three Mile Island nuclear power plant. Since that event, the industry has focused considerable attention to increasing plant 2 operability through improving control room operator performance. A key aspect of that improvement process is the use of human engineering design principles.
Advances in computer technology since 1978 have enabled nuclear engineers and control room designers to display more information, in a greater variety of ways, but this can be counterproductive, because part of the problem is the overload of information. Improving "user friendliness" while maintaining the quantity and type of information at the operator's disposal has posed a formidable engineering challenge.
Claims (14)
1. The algorithm averages the 'process representation' Inputs from the A and B cold legs and outputs the average as the loop (1 or 2) T c Oprocess representation'..
2. The algorithm checks to see if A and B are Ovalldn - Yes, output average as mvalid, go to step 5.
m Not go to step 3.
3. The algorithm checks to see if A or 8 Is operator select'.
- Yes, go to step 4..
m No, output the average as mfault select, go to step 5.
4. An indicator device as claimed in claim 1 substantially as herein described with reference to the accompanying drawings.
4. The algorithm checks to see if A or 8 Is 'fault selectw.
- Yes, output the average as fault select. go to step
5.
- No, outputethe average as 'operator seletto., go to step 5.
5. Ddviation check A and 8 against the average. (Within sum of 112 wide range instrument uncertainty andexpected process variation).
If the deviation checks are satisfactory, clear the 'T, Cold Leg (1A/13 or ZA/28) Temp DeviatIonw &lam, if present. go to step
6.
97- If either ceviation check is unsatisfactory, generate the 'T c Cold Leg (1A/18 or 2A12B) Temp Deviation' alarm, go to step 6.
6. The algorithm checks to see if A and 8 are narrow range.
- Yes, output the average as narrow range, go to step
7.
- No, output the average as wide range, go to step 7.
7. The algorithm cheeks to see If either or both Inputs is out-of-range.
If either or both are out-of-range, output this TC loop process representationd signal with the message "out-of-rangel, go to step
8.
If both are In-range, this T c loop process representationm Is not output with the message. "out-of-range. go to step 8.
8. The algoritro checks to see if A and 8 inputs are PAMI.
Yess output the 4PAMI0 message with the loop (1 or 2) T m - b., c process representation", the loop T c algorithm is repeated. go to step 1.
NO, do not output the PAMI message with the loop (1 or 2) T. Process representation, the loop T c algorit.lim Is repeated, go to step 1.
Method to Determine RCS T cold The RCS T cold uprocess representation will he calculated by averaging the process representation' Inputs from loop 1 and 2 T cold' No. output the Oprocess representations from step 2 as,fault select', so to step 6. 5. The algorithm checks to see if signal 1 or 2 Is 'fault select.
m Yes, output the process representations from step 2 is,fault select,'& 90 to step 6.
m No, output the Oprocess representation' from step 2 as operator selee', go to step 6. Rance Check 6. This step Is Identical to step 10 of the generic validation algorithm. Go to step 1 and repeat the algorithm. Pressuriger Pressure Validation Algorithm (Fig ' 38) There are 12 sensors used to mature pressurIzer and RCS pressure. During most operational sequences, the operator Is looking for a single process representationO of all pressurizer/RCS pressure readings. This value will he provided In DIAS with a display labeled 'PRESS'. For consistency& this value, which Is determined by OIAS& Is also used on the 1PSO board. To Insure reliability. OPS compares DIAS's Press ' 91 process representation' with Its own Press sprocess representation' and alarms any deviations (OPSIDIAS Press Calculation Deviation).
The algorithm determines a 'valid process representation' for pressurizer/RCS pressure. For situations when a valid' pressure dprocess representations cannot he calculated, the algorithm will select the sensor closest to the last valid' signal as the 'fault selectO process representation' pressure. This autoutic fault selection Insures continuous output of the pressurizer/RCS process representationd pressure for displays and alarms. After a failure the operator may select an Individual sensor for the pressure 10 process representation' as the "fault select "Process representation'.
The following section describes the algorithm and display processing on the DIAS and CRT displays.
1. The 'process representation' pressure shall always be displayed on the applicable DIAS display andlor the CRT page(s) where a single 'process representation' Is needed as opposed to multiple sensor values.
2. The pressure algorithm and display processing Is Identical to the generic validation algorithm with the following modifications:
a. Steps 1-5 (Determination of 'Calculated Signal' and Faults) of the generic validation algorithm are modified to account for the following.
1. Three sensor ranges (0-1600 psig), (1500-2500 psig) and (0-4000 psig).
h. The remainder of the generic algorithm (steps 6-10) are renumbered to account for additional steps in the (Deteminatip,p of "Calculated SIgnal' and Vaults). They are almost Identical with the minor modifications described with each step.
3. Using a menu (as described In the generic validation algorithm) the operator may view any of the 12 sensors values or single acalculated signalm.
These selections include the following:
P-103, 104. 105, 106 0-1600 psig Pressurizer Pressure P-101A, 1018, 101C, 1500-2500 psig Pressurizer Pressure 1010,100xl 1GOY P-190A, 1908 0-4000 psig RCS Pressure, PAMI CALC PRESS Calculated Signal Validation Alcorithm To simplify the discussion of sensor tag numbers, the following letterswill be used to designate pressure sensors:
P - 101A - A P - 1013 - B P - 101C - C P - 1010 - 0 P - 100x - E P - 100Y - F P - 103 - a P - 104 - H P - 105 - 1 P - 106 - j P - 190A - K P - 1908 - L The algorithm described below Is calculated and displayed Independently by both OPS and OIAS.
The pressurizer pressure calculated signal will he calculated using sensors As 8. C. D. E, F. G. M. 1. J, K and L. An attempt will be made to use the narrow 1500 - 2500 psig range sensors (A# sip C, 0, E and F) (pressure-is normally In this range). If pressure Is outside the 1500 2500 psig range, the 0 - 1600 psig range sensors (G. H. 1 and J) will he used. If pressure cannot be calculated -101- using these sensors. the 0 4000 psig range sensors (K and L) will be used. rn the event that the validation fails all. of these three ranges, the algorithm will select the sensor closest to the last j,ialid' signal as the Ofault select4 'calculated signal.
This 'fault selectO 'calculated signal will be used as the Oprocess representation' until the operator selects an 'operator selectO sensor to replace it or the algorithm is able to validate data.
Pressurizer Pressure Validation and Olsolay_Alqorithm Oetermination of Calculated Slonal and Faults (steos 1-13) 1500 2500 osic Rance Validation Attemot (stees 1-4) 1. The algorithm checks to see if there are 2 or more 'good' (1500 2500 psig narrow range) sensors.
Yes, go to step 2 No. go to step 5 and attempt (0-1600 psig range validation) Note: A sensor is "goocw It was not declared a Obadll sensor on the previous pass or a suspect sensor on a previous pass.
q- le 1.1 2. The algorithm averages all 'good (1500-2500) range sensors (A 9, C9 0, E and F). Go to step 3.
3. Deviation check all Ogood' (1500-2500) range sensors against the average (within sum of 112 narrow range uncertainty and expected process variation).
If all deviation checks are satisfactory, go to step 4 to see if the average is in range.
-102- If any deviation cheeks are unsatisfactory. the following occurs:
The sensor with the greatest deviation from the average Is flagged as a suspect sensor, then the algorithm checks to see if this the first or second pass on this scan.
If the first pass, the algorithm Is repeated, beginning at step 1.
Note: If the dev latIon check falls on the first pass, the algorithm has used one or more bad sensors to calculate the average. Performing a second pass eliminates the one bad sensor or determines that multiple sensors are bad.
If it is the second pass, the (1500-2500) range validation fails. go to step 5 to attempt 0 - 1600 psig range validation.
Note: Falling to pass the deviation check on the second pass Indicates that there are two or more simultaneous (1500-2500) range sensor failures. The algorithm cannot be sure to correctly eliminate only the bad sensors, therefore the (1500-2500) range validation mus: fail. The 0 - 1600 psIg range validation Is attempted. This Insures that the algorithm does not calculate an Incorrect signal for this case. Normally without two or more Simultaneous failures. the algorithm will detect multiple nonslmultaneous deviations, sequentially eliminate them from the algorithm and still determine a valid' signal.
-103- Ranee Selection (steo 4) 4. The algorithm checks to see if the average is In-range.
The average goes in-range at 96% and 4% of narrow range.
The average goes out-of-range at 98% and 21 of narrow range.
Note: Hysteresis prevents frequent range shifts. Out-of-range occurs at 98% and 2% to Insure that no out-of-range sensors are used to calculate a valid' output (i.e., worst case sensors would read 100% and 0%).
If In-range, do the following:
a. Clear the Validation Fault alarm. If previously present.
h. Remove the 'Validation Fault Operator Select Permissive'.
c. Output the average as the Ovalld' 'calculated signal.
d. Go to step 12.
If out-of-range, attempt the (0 - 1600 psig) range validation, go to step 5.
0 1600 pilg Ranoe Validation Attemet.(steet 5-8) 5. The algorithm checks to s ce If there are 2 or more good' 0 - 1600 psig range sensors (G, H, 1 and J)..
-104- Yes, go to step 6 No, go to step 9 and attempt (0-4,000 rangp validation) 6. The algorithm averages all 'good' 0 1600 psig range sensors (G. H. 1 and J). Go to step 7.
7. Oeviation check all 'good' 0 - 1600 psig range sensors against the average (within sum of 112 of the 0 - 1600 psig range uncertainty and expected process variation). ' m If all deviation checks are satisfactory, go to step 8 to see If the average Is In range.
0 If any deviation checks are unsatisfactory, the following occurs:
The sensor with the greatest deviation from the average is flagged as a 'suspect' sensor, then the algorithm cheeks to see If this is the first or second pass on this scan.
If the first pass, the 0 - 1600 psig range algorithm Is repeated, beginning at step 5.
Note: If the deviation check failA on the first pass, the algorithm has used one or more bad sensors to calculate the average.
Performing a second pass eliminates the one had sensor or determines that multiple sensors are had.
If it Is the second pass, the 0 - 1600 psig range validation fails, go to step 9 to attempt 0 - 4000 psig range validation.
t f -105- Note: Failing to pass the deviation check on the second pass Indicates that there are two or more simultaneous 0 - 1600 psig range sensor failures. The algorithm cannot be sure to correctly ellminate only the bad sensors, therefore the 0 - 1600 pslq range validation must fall. The 0 - 4000 psig range validation Is anempted. This Insures that the algorithm does not calculate an Incorrect signal for this cast. Normally without two or more simultaneous failures, the algorithm will detect multiple non-simultaneous deviations, sequentially eliminate them from the algorithm and still determine a 'valid' signal. Ranee Selection (step 8) 8. The algorithm checks to see If the average is In-range.
The average goes In-range at 96% and 4% of the 0 - 1600 psig range. 4 The average goes out-of-range at 98% and 2% of the 0 - 1600 psig range.
Hysteresis prevents frequent range shifts. Out-of-range occurs at 98% and 2% to Insure that no out-of-range sensors are used to calculate a valid' output (I.e.. worst case sensors would read 100% or 0%).
1 t -106- If In-range, do the following:
a. Clear the Validation Fault' alam, If previously present.
h. Remove the 'Validation Fault Operator Select Permissive.
c. Output the average as the valid 'calculated sfgnal.
d. GO to step 12.
If out-of-range, attempt the 0 4000 psig range validation, go to step
9.
0 4000 psig Ranee Validation Attemot (stees 9,
10. 11 9. The algorithm checks to see If both of the 0 - 4000 psig range sensors (K and L) are 'good'.
m Yes, 90 to step 10. - No, (0-4000 psig) range validation Is not possible, go to step 13. kb 10. The algorithm averages K and L, the 0 4000 psig range sensors. Go to step
11.
11. Oeviation cheek K and L against the average (within sum of 112 0 4000 psig range uncertainty and expected process variation).
If both deviation checks are satisfactory, do the following:
-107- a Clear the validation fault, alarm, If previously present.
b. Remove the 'Validation Fault Operator Select Permissive, if previously present.
c. Go to step
12.
If either deviation check Is unsatisfactory, go to step
13.
Valid-PANT Check (stec 12) 12. Mes the valid 'calculated signal deviation check against the PAXL sensors. Use method a If the valid' calculated signal' is In the 1500- 2500 psig or 0-1600 psig range, and method b if in the 0-4000 psig range.
Method (a) (within sum of 112 0-4000 ps19 range Instrument uncertainty. plus process variation, plus Instrument position constant).
Method (b) (within sum of 112 0-4000 psig range Instrument uncertainty, plus process variation).
Yes, do the fpllowing:
a. Output the PAW message, If not previously present.
b. Remve the PANT Fault Operator Select Permissive'. If previously present.
c. Go to step
14.
- i 0 8 --.
NO, do the following:
a. Remove the 0PAMI1 message, if previously present.
b. Generate a PAMI Fault alarm, If not previously present.
c. Enable the 1PAM1 Fault Operator Select Permissive d. GO to step 14.
Note: The (0 - 4000 psig) wi de range sensors (K and L) are not located on the pressurizer, as are the other pressure sensors. The K and L sensors are positioned at the discharge of the reactor coolant pumps (RCPs) where they measure RCS pressure. During normal operation the pressure at this location Is much higher (approximately 110 psi for a System 80 plant) than at the pressurizer. where sensors (A, B, C, 0, E. F. G, H, 1 and J) are located. An additional deviation acceptance criteria (called Instrument position constant) will be used when deviation checks are made with or againt the K and L O.1. 4000 psIg range) sensors.
Failed Validation (step 13) 13. The algorithm checks to see If the 'calculated signal' output of the previous scan was a fault select sensor.
If the previous scan was not 'fault select. a valldatfon fault has just occurred, do the following:
a. Generate a Validation Fault alarm.
-log- b CevIation check all sensors or L) against the last mvalldm signal. Select the sensor that deviates the least from the last 'valid' signal as the 'fault select sensor.
c. Output the signal from the fault select sensor as the pressurizer pressure 'calculated signal.
d. Enable the Validation Fault Operator Select Permissive'.
e. Go to step 14.
Pressuri,.er Pressure 'Orocess Recresentationg c-election (stens 14.
14. Step 14 Is Identical to step 6 of the generic validation algorithm.
15. Step 15 Is Identical to step 7 of the generic validation algorithm.
PA141 Cheek of Operator Select Sensor (steo 16) 16. Step 16 Is Identical to step 8 of the generic validation, except that the de 1. ylatfon criteria are the same.as those specified In step 12 of this pressurizer pressure validation and dIsplay algorithim. - Sad Sansor Evaluation (steo 17) 17. This step Is Identical to step 9 of the generic validation algorithm, except that the devIation criteria checks are the same as those specified In step 12 of this pressurizer pressure validation and display algorithm.
* Ranee Cheek (step 15) 18. The algorithm checks to see If the Oprocess representation' Is at or above the maximum numerical range (1600 psig for the 0.600 psig sensors, 2SOO psig for the 1500 - 2500 psIg sensors and 4000 psIg for the 0 - 4000 psig sensors) or at or below the mininum numerical range (0 psig for the 0 - 1600 psig and 15 4000 pslg sensors and 1500 psig for the 1500 - 2500 psIg sensors).
Yes, Output the massage 'Out-of-Range' along with the process, epresentatfong signal. On the CRT place an asterisk preceding the Oprocess representation'. Go to step 1 and repeat the algorithm.
No, go to step 1 and repeat the algorithm.
-Note: Out-of-rangel Informs the operator that the actual pressure may be higher or lower than the sensor Is capable of measuring.
P11 CLAIMS 1. An indicator device for a plant operating parameter, the plant including a plurality of sensors for the same parameter, a first set of at least one sensor having a first range of sensitivity at a first level of precision and a second set of at least one sensor having a second, different range of sensitivity and a second level of precision, the second range overlapping at least a portion of the first range, wherein each sensor has means associated therewith for generating a respective sensor signal commensurate with the sensed value of the parameter, said indicator device comprising: means responsive to the means for generating sensor signals, for computing a best estimate representative value of the parameter; a display screen having a plurality of display fields, means for displaying the representative value on said screen in one field, means for identifying in other fields on the screen, each of said sensor sets, the respective ranges, and each of the sensors within each set; means for selecting any of said sensors and displaying the signal value associated with the selected sensor on the screen.
2. The indicator device of claim 1, further including a first control system which utilizes a first parameter value derived from the first set of sensors and a second control system that utilizes a second parameter value derived from the second control system; and wherein said screen includes means for selecting and displaying either of said first and second parameter values.
Ill 3. The indicator device of claim 2. wherein the first control system provides control during normal plant operation and the second control system provides plant control during plant abnormal operation.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/430,792 US5267277A (en) | 1989-11-02 | 1989-11-02 | Indicator system for advanced nuclear plant control complex |
GB9023718A GB2238650B (en) | 1989-11-02 | 1990-10-31 | Plant monitor system |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9406418D0 GB9406418D0 (en) | 1994-05-25 |
GB2274538A true GB2274538A (en) | 1994-07-27 |
GB2274538B GB2274538B (en) | 1995-01-04 |
Family
ID=26297874
Family Applications (6)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9400820A Expired - Fee Related GB2272327B (en) | 1989-11-02 | 1990-10-31 | Display device |
GB9400818A Expired - Fee Related GB2272325B (en) | 1989-11-02 | 1990-10-31 | Plant monitor system |
GB9400819A Expired - Fee Related GB2272326B (en) | 1989-11-02 | 1994-01-17 | Plant monitor system |
GB9406420A Expired - Fee Related GB2274540B (en) | 1989-11-02 | 1994-03-31 | Display device |
GB9406418A Expired - Fee Related GB2274538B (en) | 1989-11-02 | 1994-03-31 | Indicator device |
GB9406419A Expired - Fee Related GB2274539B (en) | 1989-11-02 | 1994-03-31 | Industrial process parameter measurement |
Family Applications Before (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9400820A Expired - Fee Related GB2272327B (en) | 1989-11-02 | 1990-10-31 | Display device |
GB9400818A Expired - Fee Related GB2272325B (en) | 1989-11-02 | 1990-10-31 | Plant monitor system |
GB9400819A Expired - Fee Related GB2272326B (en) | 1989-11-02 | 1994-01-17 | Plant monitor system |
GB9406420A Expired - Fee Related GB2274540B (en) | 1989-11-02 | 1994-03-31 | Display device |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9406419A Expired - Fee Related GB2274539B (en) | 1989-11-02 | 1994-03-31 | Industrial process parameter measurement |
Country Status (1)
Country | Link |
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GB (6) | GB2272327B (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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FR2519464A1 (en) * | 1981-12-31 | 1983-07-08 | Framatome Sa | METHOD FOR MONITORING AN ELECTRICITY GENERATION PLANT EQUIPPED WITH A NUCLEAR REACTOR |
US4816208A (en) * | 1986-02-14 | 1989-03-28 | Westinghouse Electric Corp. | Alarm management system |
ES2043654T3 (en) * | 1986-05-05 | 1994-01-01 | Westinghouse Electric Corp | MONITORING SYSTEM AND VISUAL PRESENTATION OF STATE TREES. |
US4812819A (en) * | 1987-04-13 | 1989-03-14 | The United States Of America As Represented By The United States Department Of Energy | Functional relationship-based alarm processing system |
US4853175A (en) * | 1988-03-10 | 1989-08-01 | The Babcock & Wilcox Company | Power plant interactive display |
US5167010A (en) * | 1989-08-03 | 1992-11-24 | Westinghouse Electric Corp. | Expert advice display processing system |
-
1990
- 1990-10-31 GB GB9400820A patent/GB2272327B/en not_active Expired - Fee Related
- 1990-10-31 GB GB9400818A patent/GB2272325B/en not_active Expired - Fee Related
-
1994
- 1994-01-17 GB GB9400819A patent/GB2272326B/en not_active Expired - Fee Related
- 1994-03-31 GB GB9406420A patent/GB2274540B/en not_active Expired - Fee Related
- 1994-03-31 GB GB9406418A patent/GB2274538B/en not_active Expired - Fee Related
- 1994-03-31 GB GB9406419A patent/GB2274539B/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001002919A1 (en) * | 1999-07-01 | 2001-01-11 | Honeywell Inc. | Multivariable process trend display and methods regarding same |
US6577323B1 (en) | 1999-07-01 | 2003-06-10 | Honeywell Inc. | Multivariable process trend display and methods regarding same |
Also Published As
Publication number | Publication date |
---|---|
GB2272325B (en) | 1994-09-28 |
GB2274538B (en) | 1995-01-04 |
GB2272326A (en) | 1994-05-11 |
GB9406420D0 (en) | 1994-05-25 |
GB2272327B (en) | 1994-09-28 |
GB2274539A (en) | 1994-07-27 |
GB9400818D0 (en) | 1994-03-16 |
GB2272327A (en) | 1994-05-11 |
GB9400820D0 (en) | 1994-03-16 |
GB2272325A (en) | 1994-05-11 |
GB2272326B (en) | 1994-10-05 |
GB9406419D0 (en) | 1994-05-25 |
GB2274539B (en) | 1995-01-04 |
GB9406418D0 (en) | 1994-05-25 |
GB2274540A (en) | 1994-07-27 |
GB2274540B (en) | 1995-01-04 |
GB9400819D0 (en) | 1994-03-16 |
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Legal Events
Date | Code | Title | Description |
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732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20081031 |