EP0100532A2 - Power plant control method - Google Patents

Power plant control method Download PDF

Info

Publication number
EP0100532A2
EP0100532A2 EP83107456A EP83107456A EP0100532A2 EP 0100532 A2 EP0100532 A2 EP 0100532A2 EP 83107456 A EP83107456 A EP 83107456A EP 83107456 A EP83107456 A EP 83107456A EP 0100532 A2 EP0100532 A2 EP 0100532A2
Authority
EP
European Patent Office
Prior art keywords
steam
turbine
generator
signal
steam generator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP83107456A
Other languages
German (de)
French (fr)
Other versions
EP0100532B1 (en
EP0100532A3 (en
Inventor
Günter Dr. Kallina
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to AT83107456T priority Critical patent/ATE37588T1/en
Publication of EP0100532A2 publication Critical patent/EP0100532A2/en
Publication of EP0100532A3 publication Critical patent/EP0100532A3/en
Application granted granted Critical
Publication of EP0100532B1 publication Critical patent/EP0100532B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
    • F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
    • F01K3/20—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters with heating by combustion gases of main boiler
    • F01K3/22—Controlling, e.g. starting, stopping

Definitions

  • the controlled system is particularly slow with coal-fired steam generators and also has an integral behavior.
  • the result is that the admission pressure regulator may only be switched on weakly, that is to say with a small proportionality constant and a long reset time, so that faults are corrected very slowly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Eletrric Generators (AREA)
  • Control Of Turbines (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)
  • Feedback Control In General (AREA)

Abstract

1. Method for output regulation in a power unit comprising a forced-through-flow steam generator (1), steam turbine (2) and generator (3), in which the electric generator outptut is adjusted by way of a control action (10) in the energy supply of the steam generator (1), and the steam pressure (pi ) before the turbine is adjustable by way of a control action (6) in the steam throughput of the turbine, in which a correstive signal, which is temporally decaying, derived from the manipulated variable of the output regulating circuit, influences the command variable (ps ) of the pressure regulating circuit, characterized in that the corrective signal is generated when, in a model-like electrical simulation (12, 13) of the controlled system "steam generator", a signal corresponding to the "steam generation behaviour" of the steam generator is subtractively combined with the actuating signal of the energy regulator and the difference signal is delayed corresponding to the store behaviour of the steam generator.

Description

Die Erfindung bezieht sich auf ein Verfahren und eine Einrichtung zur Leistungsregelung an einem aus Zwangsdurchlauf - Dampferzeuger, Dampfturbine und Generator bestehenden Kraftwerksblock.The invention relates to a method and a device for power control on a power plant block consisting of a once-through steam generator, steam turbine and generator.

Bei dem bisher üblichen Regelverfahren wird die von der Turbine abgegebene elektrische Leistung von einem PI-Regler, dem Turbinenregler, geregelt. Er wirkt direkt auf das Turbineneinlaßventil.In the previously common control method, the electrical power output by the turbine is controlled by a PI controller, the turbine controller. It acts directly on the turbine inlet valve.

Der Druck im Dampferzeuger vor dem Turbinenventil, der sogenannte Vordruck, wird von einem PID-Regler geregelt. Der Stelleingriff erfolgt in die Energiezufuhr der Dampferzeugung, also auf den Brennstoff- und Luftstrom oder auf Brennstoff-Luft- und Speisewasserstrom.The pressure in the steam generator upstream of the turbine valve, the so-called pre-pressure, is regulated by a PID controller. The control intervention takes place in the energy supply of the steam generation, that is to say in the fuel and air flow or in the fuel-air and feed water flow.

Die Regelstrecke ist insbesondere bei kohlebeheizten Dampferzeugern sehr träge und hat darüber hinaus integrales Verhalten. Die Folge ist, daß der Vordruckregler nur schwach aufgeschaltet werden darf, also mit kleiner Proportionalitätskonstante und großer Nachstellzeit, so daß Störungen sehr langsam ausgeregelt werden.The controlled system is particularly slow with coal-fired steam generators and also has an integral behavior. The result is that the admission pressure regulator may only be switched on weakly, that is to say with a small proportionality constant and a long reset time, so that faults are corrected very slowly.

Es besteht die Aufgabe, das bekannte Regelverfahren so zu verbessern, daß es erheblich schneller auf Störungen bzw. Änderungen in der Regelstrecke reagiert.The object is to improve the known control method in such a way that it responds considerably more quickly to disturbances or changes in the controlled system.

Eine Lösung der gestellten Aufgabe, wird in dem im Anspruch 1 angegebenen Verfahren gesehen. Durch die dynamische Korrektur, in der das Speicherverhalten und Dampferzeugungsverhalten des Dampferzeugers nachgebildet ist, wird der Vordruck so vorgesteuert, daß die Regelstrecke "Dampferzeuger und dynamisch vorgesteuerter Turbinenregelkreis" aus der Sicht des Leistungsreglers einfaches Verzögerungsverhalten mit einer geringen Zeitkonstante hat. Der Leistungsregelkreis ist folglich unkritisch und sehr schnell. In der Praxis hat sich gezeigt, daß die Nachstellzeit des Leistungsreglers etwa um den Faktor 100 verringert werden kann.A solution to the problem is seen in the method specified in claim 1. Through the dynamic correction, in which the storage behavior and steam generation behavior of the steam generator is simulated, the admission pressure is pre-controlled in such a way that the controlled system From the point of view of the power controller, "steam generator and dynamically pilot-controlled turbine control loop" has simple deceleration behavior with a low time constant. The power control loop is consequently uncritical and very fast. In practice it has been shown that the reset time of the power controller can be reduced by a factor of about 100.

Zur Erläuterung der Erfindung ist in der Figur ein Beispiel einer Schaltungsanordnung zur Durchführung des Verfahrens dargestellt und im folgenden beschrieben.To explain the invention, an example of a circuit arrangement for carrying out the method is shown in the figure and described below.

Der Kraftwerksblock besteht aus dem Zwangsdurchlauf-Dampferzeuger 1, der Dampfturbine 2 und dem elektrischen Generator 3.The power plant block consists of the once-through steam generator 1, the steam turbine 2 and the electric generator 3.

In dem Dampferzeuger 1 wird das über die Leitung 4 zugeführte Speisewasser mit Hilfe des über die Leitung 5 zugeführten Brennstoff- bzw. Brennstoff-Luftgemischs verdampft und mit dem Vordruck pi über das Einlaßventil 6 der Dampfturbine 2 zugeführt.In the steam generator 1, the feed water supplied via line 4 is evaporated with the aid of the fuel or fuel-air mixture supplied via line 5 and supplied with the admission pressure p i via the inlet valve 6 to the steam turbine 2.

Die vom Generator 3 abgegebene elektrische Leistung Peli wird in einer Vergleichsstelle 7 mit einem in dem Sollwertsteller 8 eingestellten Leistungssollwert Pels verglichen. Die resultierende Regeldifferenz dPel wird einem Leistungsregler 9 mit PID-Verhalten zugeführt, dessen Ausgangsgröße als Stellsignal yL auf ein in die Energiezufuhr 5 eingreifendes Stellglied 10 und evtl. auf ein in den Speisewasserstrom eingreifendes Stellglied wirkt.The electrical power P el i emitted by the generator 3 is compared in a comparison point 7 with a power target value P el s set in the set point adjuster 8. The resulting control difference dP el is fed to a power controller 9 with PID behavior, the output variable of which acts as control signal y L on an actuator 10 engaging in the energy supply 5 and possibly on an actuator engaging in the feed water flow.

Parallel dazu wird das Stellsignal yL des Leistungsreglers 9 dem Positiveingang eines Differenzglieds 11 und dem Eingang eines Übertragungsgliedes ,12 höherer Ordnung zugeführt, in welchem das Dampferzeugungsverhalten der Regelstrecke "Dampferzeuger" elektrisch nachgebildet wird. Das Ausgangssignal des Funktionsgenerators 12 ist dem Negativeingang des Differenzgliedes 11 aufgeschaltet, dessen Ausgang mit dem Eingang eines Verzögerungsgliedes 13 erster Ordnung verbunden ist, welches das Speicherverhalten des Dampferzeugers elektrisch nachbildet.In parallel, the control signal y L of the power controller 9 is fed to the positive input of a differential element 11 and the input of a higher-order transmission element 12, in which the steam generation behavior of the “steam generator” controlled system is electrically simulated. The output signal of the function generator 12 is applied to the negative input of the differential element 11, the output of which is connected to the input of a delay element 13 first Order is connected, which electrically simulates the storage behavior of the steam generator.

Der das Druckkorrektursignal pk führende Ausgang des Verzögerungsgliedes 13 ist mit dem Negativeingang eines zweiten Differenzgliedes 14 verbunden, an dessen Positiveingang der Vordruck-Sollwert p s geschaltet ist. Die auf diese Weise dynamisch korrigierte Führungsgröße "Vordruck" für die Turbinenregelung wird einem Vordruckregler 15 mit PI-Verhalten zugeführt, seine Regelgröße ist der an einer Druckmeßstelle 16 in der Dampfleitung zur Dampfturbine 2 gemessene Istwert pi des Vordrucks. Das Stellsignal yT des Turbinenreglers 15 betätigt das Turbineneinlaßventil 6 und beeinflußt somit den Dampfdurchsatz durch die Turbine. Dieser Turbinenregelkreis ist schnell und unkritisch, so daß in Verbindung mit dem Leistungsregelkreis, der ebenfalls schnell und unkritisch ist, ein weitgehend verzögerungsfreies Ansprechen der Gesamtregelung des Kraftwerksblocks auf Änderungen der Führungs- bzw. Regelgröße "elektrische Leistung" erfolgt.The output of the delay element 13 carrying the pressure correction signal p k is connected to the negative input of a second differential element 14, to the positive input of which the form pressure setpoint p s is connected. In this way, the dynamically corrected command variable "pre-pressure" for the turbine control is fed to a pre-pressure controller 15 with PI behavior; its controlled variable is the actual value p i of the pre-pressure measured at a pressure measuring point 16 in the steam line to the steam turbine 2. The control signal y T of the turbine controller 15 actuates the turbine inlet valve 6 and thus influences the steam throughput through the turbine. This turbine control loop is fast and uncritical, so that in connection with the power control loop, which is also fast and uncritical, there is a largely instantaneous response of the overall control of the power plant block to changes in the command or control variable "electrical power".

Claims (2)

1. Verfahren zur Leistungsregelung an einem aus Zwangsdurchlauf-Dampferzeuger, Dampfturbine und Generator bestehenden Kraftwerksblock, dadurch gekennzeichnet , daß die elektrische Generatorleistung über einen Stelleingriff in die Energiezufuhr des Dampferzeugers geregelt wird und daß in einer modellmäßigen elektrischen Nachbildung der Regelstrecke "Dampferzeuger" aus der Stellgröße des Leistungsreglers ein die Führungsgröße "Druck" einer unterlagerten Turbinenregelung beeinflussendes Korrektursignal gebildet wird, wobei die Turbinenregelung mit der Regelgröße "Druck" und der Stellgröße "Dampfdurchsatz" betrieben wird.1. A method for power control on a forced-flow steam generator, steam turbine and generator existing power plant block, characterized in that the electrical generator power is controlled via an intervention in the energy supply of the steam generator and that in a model electrical simulation of the controlled system "steam generator" from the manipulated variable of the power controller, a correction signal influencing the command variable "pressure" of a subordinate turbine control is formed, the turbine control being operated with the control variable "pressure" and the manipulated variable "steam throughput". 2. Einrichtung zur Durchführung des Verfahrens nach Anspruch 1, gekennzeichnet durch a) einen Leistungsregler (9) mit PID-Verhalten, mit der Regeldifferenz (dPel) der elektrischen Generatorleistung als Eingangsgröße, dessen Ausgangssignal als Stellsignal (yL) Stellglieder in den dem Dampferzeuger (1) zugeführten Energiestrom betätigt, b) einen Turbinenregler (15) mit PI-Verhalten, dessen Ausgangssignal als Stellsignal (yT) auf die Turbineneinlaßventile (6) wirkt und dessen Eingängen ein am Ausgang des Dampferzeugers (1) gewonnenes Drucksignal (pi) als Regelgröße und ein Differenzsignal aus Drucksollwert (ps) und einem Druckkorrekturwert (Pk) als Führungsgröße aufgeschaltet ist, c) ein Übertragungsglied (12) höherer Ordnung, das das Dampferzeugungsverhalten der Regelstrecke "Dampferzeuger" nachbildet, und dessen Eingang mit dem Ausgang des Leistungsreglers (9) verbunden ist, d) ein erstes Differenzglied (11), dessen Positiveingang mit dem Ausgang des Leistungsreglers (9) und dessen Negativeingang mit dem Ausgang des Funktionsgenerators (12) verbunden ist, e) ein Verzögerungsglied erster Ordnung, das die Speicherwirkung des Dampferzeugers näherungsweise nachbildet und dessen Eingang mit dem Ausgang des ersten Differenzglieds (11) verbunden ist, f) ein zweites Differenzglied (14), dessen Positiveingang mit dem Sollwert (p ) der Regelgröße "Druck" des Turbinenreglers (15) und dessen Negativeingang mit dem Korrektursignal (Pk) aus dem Verzögerungsglied (13) beaufschlagt ist und dessen Ausgangssignal die Führungsgröße des Turbinenreglers (15) ist. 2. Device for performing the method according to claim 1, characterized by a) a power controller (9) with PID behavior, with the control difference (dP el ) of the electrical generator power as an input variable, the output signal of which, as a control signal (y L ), actuates actuators in the energy flow supplied to the steam generator (1), b) a turbine controller (15) with PI behavior, the output signal acts as a control signal (y T ) on the turbine inlet valves (6) and the inputs of a pressure signal (p i ) obtained at the output of the steam generator (1) as a control variable and a differential signal Pressure setpoint (p s ) and a pressure correction value ( Pk ) is applied as a reference variable, c) a transmission element (12) of higher order, which simulates the steam generation behavior of the controlled system "steam generator" and whose input is connected to the output of the power controller (9), d) a first differential element (11), the positive input of which is connected to the output of the power regulator (9) and the negative input of which is connected to the output of the function generator (12), e) a delay element of the first order which approximately simulates the storage effect of the steam generator and whose input is connected to the output of the first differential element (11), f) a second differential element (14), the positive input with the setpoint (p) of the controlled variable "pressure" of the turbine controller (15) and the negative input with the correction signal (Pk) from the delay element (13) and whose output signal is the reference variable of the Turbine controller (15).
EP83107456A 1982-08-03 1983-07-28 Power plant control method Expired EP0100532B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83107456T ATE37588T1 (en) 1982-08-03 1983-07-28 METHOD AND DEVICE FOR POWER CONTROL AT A POWER PLANT UNIT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3228996 1982-08-03
DE19823228996 DE3228996A1 (en) 1982-08-03 1982-08-03 METHOD AND DEVICE FOR CONTROLLING THE POWER ON A POWER PLANT

Publications (3)

Publication Number Publication Date
EP0100532A2 true EP0100532A2 (en) 1984-02-15
EP0100532A3 EP0100532A3 (en) 1985-07-03
EP0100532B1 EP0100532B1 (en) 1988-09-28

Family

ID=6170036

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83107456A Expired EP0100532B1 (en) 1982-08-03 1983-07-28 Power plant control method

Country Status (6)

Country Link
EP (1) EP0100532B1 (en)
AT (1) ATE37588T1 (en)
AU (1) AU564160B2 (en)
DE (2) DE3228996A1 (en)
IN (1) IN158826B (en)
ZA (1) ZA835638B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3500482A1 (en) * 1985-01-09 1986-07-10 MAN Gutehoffnungshütte GmbH, 4200 Oberhausen Method and device for controlling the reference variable of a regulating device which has two regulators
DE3632041A1 (en) * 1985-10-03 1987-04-09 Bbc Brown Boveri & Cie Process and device for regulating the output of a steam power station unit
DE4405350A1 (en) * 1993-08-13 1995-02-16 Abb Patent Gmbh Method for determining the live steam mass flow in the drive steam pipe of a steam generating station (steam power station, steam power plant)
EP0684366A1 (en) * 1994-05-26 1995-11-29 ABBPATENT GmbH Process and system for the control and regulation of the power of a steam power plant
EP1647676A1 (en) * 2004-10-12 2006-04-19 Siemens Aktiengesellschaft Method for simulating the operating characteristics of a steam turbine plant
EP1647677A1 (en) * 2004-10-12 2006-04-19 Siemens Aktiengesellschaft Method for simulating the operating characteristics of a steam turbine plant
WO2012160206A1 (en) * 2011-05-26 2012-11-29 Electricite De France Control system for multivariable regulation of a fossil fuel power station
WO2015028366A3 (en) * 2013-08-28 2015-05-07 Siemens Aktiengesellschaft Operating method for an externally heated once-through steam generator
CN112947048A (en) * 2021-01-28 2021-06-11 国网湖南省电力有限公司 Control method, system and medium of multivariable coupling control system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3963479B2 (en) * 1996-03-07 2007-08-22 シーメンス アクチエンゲゼルシヤフト Method and apparatus for rapid power regulation of power plant
DE102004014283B4 (en) * 2004-03-22 2006-12-14 Amovis Gmbh Method for operating an independent cycle process
PL3269948T3 (en) * 2016-07-15 2022-07-18 Carbon-Clean Technologies Gmbh Method for the adaptation of the performance of a steam turbine power plant installation and steam turbine power plant installation
CN110761858B (en) * 2018-07-25 2022-03-08 中国石油化工股份有限公司 Reheating generator set simulation system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE942514C (en) * 1953-07-31 1956-05-03 Siemens Ag Overflow control for steam engines
US3338054A (en) * 1964-12-29 1967-08-29 Combustion Eng Method and apparatus for increasing control response of a vapor generator
CH590401A5 (en) * 1975-04-17 1977-08-15 Sulzer Ag

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3500482A1 (en) * 1985-01-09 1986-07-10 MAN Gutehoffnungshütte GmbH, 4200 Oberhausen Method and device for controlling the reference variable of a regulating device which has two regulators
DE3632041A1 (en) * 1985-10-03 1987-04-09 Bbc Brown Boveri & Cie Process and device for regulating the output of a steam power station unit
DE4405350A1 (en) * 1993-08-13 1995-02-16 Abb Patent Gmbh Method for determining the live steam mass flow in the drive steam pipe of a steam generating station (steam power station, steam power plant)
EP0684366A1 (en) * 1994-05-26 1995-11-29 ABBPATENT GmbH Process and system for the control and regulation of the power of a steam power plant
EP1647676A1 (en) * 2004-10-12 2006-04-19 Siemens Aktiengesellschaft Method for simulating the operating characteristics of a steam turbine plant
EP1647677A1 (en) * 2004-10-12 2006-04-19 Siemens Aktiengesellschaft Method for simulating the operating characteristics of a steam turbine plant
WO2012160206A1 (en) * 2011-05-26 2012-11-29 Electricite De France Control system for multivariable regulation of a fossil fuel power station
FR2975797A1 (en) * 2011-05-26 2012-11-30 Electricite De France CONTROL SYSTEM FOR MULTIVARIZABLE CONTROL OF FLAME THERMAL POWER PLANT
RU2611113C2 (en) * 2011-05-26 2017-02-21 Электрисите Де Франс Control system for thermal power plant multivariant control
WO2015028366A3 (en) * 2013-08-28 2015-05-07 Siemens Aktiengesellschaft Operating method for an externally heated once-through steam generator
CN112947048A (en) * 2021-01-28 2021-06-11 国网湖南省电力有限公司 Control method, system and medium of multivariable coupling control system
CN112947048B (en) * 2021-01-28 2023-08-04 国网湖南省电力有限公司 A control method, system and medium for a multivariable coupled control system

Also Published As

Publication number Publication date
ZA835638B (en) 1984-04-25
EP0100532B1 (en) 1988-09-28
EP0100532A3 (en) 1985-07-03
AU1750783A (en) 1984-02-09
DE3378136D1 (en) 1988-11-03
AU564160B2 (en) 1987-08-06
ATE37588T1 (en) 1988-10-15
DE3228996A1 (en) 1984-02-09
IN158826B (en) 1987-01-31

Similar Documents

Publication Publication Date Title
EP0100532A2 (en) Power plant control method
DE3116340C2 (en) Method and control device for limiting the thermal stress on components of a steam turbine that occurs when the load changes
EP0428550B1 (en) Stereo lambda control system
EP1267229B1 (en) Control method and device for startup and shutdown operation of a processing component in a technical process
DE102007035976A1 (en) Steam temperature control using an integrated function block
DE185600T1 (en) CONTROL SYSTEM WITH A PERIODIC AND DIFFERENTIATED FUNCTION GENERATOR.
WO2002008576A1 (en) Method for the primary control in a combined gas/steam turbine installation
CH617494A5 (en)
DE19830341C1 (en) Method for operating a control device and device for carrying out the method
DE102010041964A1 (en) Method for regulating a short-term increase in output of a steam turbine
DE2025528C3 (en) Control device for a steam turbine power plant
DE2445525A1 (en) PROCEDURE FOR INFLUENCING THE OUTLET TEMPERATURE OF STEAM THROUGH A TOUCH HEATING SURFACE OF A STEAM GENERATOR
EP3542229B1 (en) Device and method for determining the parameters of a control device
DE3632041A1 (en) Process and device for regulating the output of a steam power station unit
DE69808779T2 (en) METHOD FOR AVOIDING WINDUP IN PID CONTROLLERS THROUGH NON-LINEAR REINFORCEMENT
DE3541148C2 (en)
EP0178485B1 (en) Apparatus for controlling the feedback of the charging pressure of a combustion engine
EP0108928B1 (en) Control method of a power plant
DE2518158B2 (en) Power regulator for thermal energy generation systems
EP0684366B1 (en) Process and system for the control and regulation of the power of a steam power plant
DE4124678C2 (en)
DE4329759C2 (en) Process control process
DE1426803A1 (en) Electro-hydraulic control device for a steam turbine
EP0507730B1 (en) Apparatus for the load-dependent regulation of the feedwater flow in a forced circulation steam generator
DE10055166C2 (en) Process for controlling the power and speed of a turbine

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE DE GB IT NL SE

17P Request for examination filed

Effective date: 19841219

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): AT BE DE GB IT NL SE

17Q First examination report despatched

Effective date: 19861002

D17Q First examination report despatched (deleted)
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE DE GB IT NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19880928

REF Corresponds to:

Ref document number: 37588

Country of ref document: AT

Date of ref document: 19881015

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3378136

Country of ref document: DE

Date of ref document: 19881103

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ITF It: translation for a ep patent filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITTA It: last paid annual fee
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20020619

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20020711

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20020715

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20020719

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20020916

Year of fee payment: 20

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20030727

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20030728

Ref country code: AT

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20030728

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

NLV7 Nl: ceased due to reaching the maximum lifetime of a patent

Effective date: 20030728