EP0376914B1 - Testing method of individual valves of steam turbines and testing device for carrying out the method - Google Patents

Testing method of individual valves of steam turbines and testing device for carrying out the method Download PDF

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Publication number
EP0376914B1
EP0376914B1 EP19890890329 EP89890329A EP0376914B1 EP 0376914 B1 EP0376914 B1 EP 0376914B1 EP 19890890329 EP19890890329 EP 19890890329 EP 89890329 A EP89890329 A EP 89890329A EP 0376914 B1 EP0376914 B1 EP 0376914B1
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EP
European Patent Office
Prior art keywords
test
pressure
line
valve
control
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EP19890890329
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German (de)
French (fr)
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EP0376914A3 (en
EP0376914A2 (en
Inventor
Albert Dipl.-Ing. Harrer
Franz Kagl
Günter Lunacek
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Austrian Energy and Environment SGP Waagner Biro GmbH
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Austrian Energy and Environment AG and Co KG
Austrian Energy and Environment SGP Waagner Biro GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/18—Final actuators arranged in stator parts varying effective number of nozzles or guide conduits, e.g. sequentially operable valves for steam turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/20—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted
    • F01D17/22—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical
    • F01D17/26—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical fluid, e.g. hydraulic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/20—Checking operation of shut-down devices

Definitions

  • the invention relates to a test method according to the preamble of patent claim 1.
  • Another object of the invention relates to a test device according to the preamble of claim 6.
  • valves being each provided with a hydraulic actuator which can be actuated by a pressure oil line under the influence of an automatic control device against the action of a spring acting on the valve in the closing direction, the supply to the first blade ring of the Runner so that several sectors are provided distributed over the circumference, which are automatically controlled separately with steam via one or more valves according to the power requirement.
  • individual valves e.g. lose their full functionality due to impurities in the steam or through deposits, which can easily occur, especially during long operation with constant load.
  • the presence of e.g. stiff or stuck valve for the time since the other valves compensate for the under or underperformance of this valve with automatic control.
  • the fault is usually only recognized when it is no longer possible to make the valve work without removing it.
  • US Pat. No. 4,059,960 describes a partial stroke test device for valves of a steam turbine with reheating.
  • the valve movements during the test must remain very small so that there are no noticeable changes in the amount of steam and thus also in the turbine output.
  • the control signal of the control system is preferably switched off during the duration of the valve test, so that there is no closed control loop.
  • a valve test in turbines which are operated with fluctuating outputs would mostly be interrupted due to the control signal which is always necessary and, with a few exceptions, made impossible.
  • US Pat. No. 4,059,960 does not mention the means by which valve control is carried out.
  • the object of the invention is to remedy the shortcomings mentioned above. This object is achieved by the measure according to the characterizing part of patent claim 1. The exact adjustment of the oil pressure between the supply line and the test control line in combination with the opening of the connection can only be seen after the adjustment has been confirmed.
  • test device used is characterized in claim 6. Its main feature is the balancing device, which interacts with a switching valve known per se in the feed line in such a way that the opening of the switching valve is only possible after feedback of the balancing of the pressure in the feed and test control device.
  • the drawing shows a circuit diagram for a control sector of the steam turbine with the devices required for the invention.
  • the passage 15 from the individual valves 5 leads to the turbine nozzle.
  • the individual control sectors can of course have a different number of valves than that shown, controls with a separately controlled supply line for each valve 5 being well known.
  • a common pressure oil line 4 the pressure of which is regulated by the automatic control device for the turbine, leads with its branch lines 4 'to the individual piston-cylinder units 10 of the valves 5.
  • These piston-cylinder units work against the pressure of the valves in the closing direction Acting springs, so that the prevailing in the pressure oil line 4 or the branch lines 4 'oil pressure determines the opening position of the individual valves.
  • switchable valves 3 are provided, which are additionally connected to a common test control line 11.
  • the piston-cylinder units 10 can be individually connected to the test control line 11, at the same time being disconnected from the supply branch line 4 ′′.
  • a balancing device 12 consisting of a differential pressure meter is installed, which transmits its measured values via a line 18 to the test device 1.
  • a pressure transducer 2 that can be regulated by the test device is installed, the supply line 6 'of which is connected to an oil pressure line 6, in which a higher pressure than the maximum control pressure in the control pressure line 4 prevails.
  • control device as shown in the drawing, is provided with a hydraulic quick-closing control, which consists of safety valves arranged in the individual piston-cylinder units 10, which act against the pressure with which the pistons of the piston-cylinder unit 10 are actuated a pressure line 6, 6 ⁇ are kept closed, this pressure line 6 in the event of a rapid shutdown of the turbine, can be decoupled from the oil pressure generator by the control device and connected to a return line (not shown) to the oil reservoir, this line 6 is advantageous in the invention Test device used, since the supply line 6 'to the test control line 11 is immediately depressurized.
  • the test device 1 itself is also advantageously connected to a power supply 7, which is automatically interrupted in the event of the aforementioned rapid shutdown of the turbine.
  • the test device 1 is connected to one of the connection points provided for the individual control sectors with the electrical lines 17 for the magnets 16, the signal line 18 for the differential pressure indicator 12 and the control line 19 for the pressure converter 2. Then the pressure transducer is set via the control line 19 so that the pressure in the test control line 11 corresponds to that in the control pressure line 4 or 4 ', which is indicated by the differential pressure meter 12 via line 18. If pressure is equal in the two lines 4 and 11, one of the magnets 16 is actuated via the corresponding line 17, as a result of which the changeover valve 3 assigned to it connects the pressure supply for the associated piston-cylinder unit 10 to the line 11.
  • a safety device is installed in the test device, which allows actuation of the magnets 16 only when the pressure in the two lines 4 and 11 is equal.
  • the automatic control device can compensate for the changing steam flow by controlling the valves 5 in the other sectors or in the intended control sector, the valve 5 to be tested over its entire stroke or be adjusted several times.
  • the control that the valve is moved over its entire stroke can be done in various ways, e.g. by measurement, limit switch, or by back calculation from the data which the automatic control provides during the test process. This process is repeated for each of the valves 5 in the control sector.
  • the test device has the advantage, on the one hand, that all valves which have faults can be determined precisely, and, on the other hand, the advantage that valve malfunctions from regular actuations (during the test) do not even occur.
  • the test device can also be equipped with a maximum and minimum pressure limiter, so that adjustments of the test control pressure can only be carried out effectively in the area in which the control device operates via the control oil pressure line 4 in order to prevent incorrect operation under small or very large loads.

Description

Die Erfindung betrifft ein Testverfahren nach dem Oberbegriff des Patentanspruches 1.The invention relates to a test method according to the preamble of patent claim 1.

Ein weiterer Gegenstand der Erfindung betrifft eine Testeinrichtung nach dem Oberbegriff des Patentanspruches 6.Another object of the invention relates to a test device according to the preamble of claim 6.

Bei Dampfturbinen mit Einzel- oder Gruppenventilregelung, wobei die Ventile jeweils mit einem hydraulischen Stellantrieb versehen sind, der von einer unter dem Einfluß einer automatischen Regeleinrichtung stehenden Druckölleitung entgegen der Wirkung einer das Ventil in Schließrichtung beaufschlagenden Feder betätigbar ist, erfolgt die Zuführung zum ersten Schaufelkranz des Läufers so, daß mehrere Sektoren über den Umfang verteilt vorgesehen sind, die getrennt mit Dampf über jeweils ein oder mehrere Ventile entsprechend dem Kraftbedarf automatisch gesteuert werden. Hierbei kommt es immer wieder vor, daß einzelne Ventile, z.B. infolge Verunreinigungen im Dampf oder durch Ablagerungen ihre volle Funktionsfähigkeit verlieren, was insbesondere bei längerem Betrieb mit konstanter Last leicht eintreten kann. Meist fällt das Vorhandensein eines z.B. schwergängigen oder klemmenden Ventils vorerst gar nicht auf, da ja die übrigen Ventile die Minder- oder Nichtleistung dieses Ventils bei automatischer Regelung ausgleichen. Der Fehler wird meist erst dann erkannt, wenn ein Gängigmachen des Ventils ohne Ausbau desselben nicht mehr möglich ist.In steam turbines with individual or group valve control, the valves being each provided with a hydraulic actuator which can be actuated by a pressure oil line under the influence of an automatic control device against the action of a spring acting on the valve in the closing direction, the supply to the first blade ring of the Runner so that several sectors are provided distributed over the circumference, which are automatically controlled separately with steam via one or more valves according to the power requirement. It happens again and again that individual valves, e.g. lose their full functionality due to impurities in the steam or through deposits, which can easily occur, especially during long operation with constant load. The presence of e.g. stiff or stuck valve for the time being, since the other valves compensate for the under or underperformance of this valve with automatic control. The fault is usually only recognized when it is no longer possible to make the valve work without removing it.

Bisher war es nur bekannt, durch Abschließen eines in der jeweiligen Regelölleitung für das oder die Ventile vorhandenen handbetätigten Ventils eine Prüfung für die Funktionsweise des oder der über diese Regelleitung gesteuerten Ventile vorzunehmen. Da das Schließen und insbesondere das Öffnen dieser Handventile nicht feinfühlig genug erfolgen kann, traten dabei immer Störungen der Regelung der Turbine ein. Weiters ist es bekannt, das Kraftöl zu den einzelnen Kolben-Zylindereinheiten zu drosseln oder ganz abzusperren, was ebenfalls zu weitgehend unkontrollierten Ventilbewegungen führt.Until now it was only known to carry out a test for the functioning of the valve or valves controlled via this control line by closing a manual valve present in the respective control oil line for the valve or valves. Since the closing and, in particular, the opening of these manual valves cannot be carried out with sufficient sensitivity, there were always malfunctions in the regulation of the turbine. It is also known, the power oil to throttle or shut off the individual piston-cylinder units, which also leads to largely uncontrolled valve movements.

So beschreibt die US-PS 4 059 960 eine Teilhub-Testeinrichtung für Ventile einer Dampfturbine mit Zwischenüberhitzung. Die Ventilbewegungen beim Test müssen sehr gering bleiben, damit keine merklichen Veränderungen der Dampfmenge und damit auch der Turbinenleistung auftreten. Überdies ist während der Dauer des Ventiltests das Stellsignal des Steuersystems vorzugsweise ausgeschaltet, sodaß kein geschlossener Regelkreis vorliegt. Bei einer Variante, bei welcher das Regelsignal ein eventuelles Testsignal überstimmt, würde bei Turbinen, die mit schwankenden Leistungen gefahren werden, ein Ventiltest aufgrund des immer wieder notwendigen Regelsignals meist unterbrochen und bis auf wenige Ausnahmen unmöglich gemacht. Hierbei verschweigt die US-PS 4 059 960, mit welchen Mitteln die Ventilsteuerung durchgeführt wird.For example, US Pat. No. 4,059,960 describes a partial stroke test device for valves of a steam turbine with reheating. The valve movements during the test must remain very small so that there are no noticeable changes in the amount of steam and thus also in the turbine output. In addition, the control signal of the control system is preferably switched off during the duration of the valve test, so that there is no closed control loop. In a variant in which the control signal overrides any test signal, a valve test in turbines which are operated with fluctuating outputs would mostly be interrupted due to the control signal which is always necessary and, with a few exceptions, made impossible. US Pat. No. 4,059,960 does not mention the means by which valve control is carried out.

Die Erfindung stellt sich zur Aufgabe, die oben angeführten Unzulänglichkeiten zu beheben. Diese Aufgabe wird durch die Maßnahme nach dem kennzeichnenden Teil des Patentanspruches 1 gelöst. Hiebei ist das genaue Abgleichen des Öldruckes zwischen der Zuführleitung und der Test-Regelleitung in Kombination mit dem Öffnen der Verbindung erst nach Rückmeldung des erfolgten Abgleichers zu sehen.The object of the invention is to remedy the shortcomings mentioned above. This object is achieved by the measure according to the characterizing part of patent claim 1. The exact adjustment of the oil pressure between the supply line and the test control line in combination with the opening of the connection can only be seen after the adjustment has been confirmed.

Die dabei Verwendung findende Testeinrichtung ist im Anspruch 6 gekennzeichnet. Ihr Hauptmerkmal ist die Abgleicheinrichtung, welche mit einem an sich bekannten Umschaltventil in der Zuführleitung derart zusammenwirkt, daß das Öffnen des Umschaltventils erst nach Rückmeldung des Abgleiches des Druckes in Zuführ- und Test-Regeleinrichtung möglich ist.The test device used is characterized in claim 6. Its main feature is the balancing device, which interacts with a switching valve known per se in the feed line in such a way that the opening of the switching valve is only possible after feedback of the balancing of the pressure in the feed and test control device.

Weitere Merkmale der erfindungsgemäßen Einrichtung gehen aus den Unteransprüchen und aus der folgenden Beschreibung eines Ausführungsbeispieles hervor.Further features of the device according to the invention emerge from the subclaims and from the following description of an exemplary embodiment.

In der Zeichnung ist ein Schaltbild für einen Regelungs-Sektor der Dampfturbine mit den für die Erfindung erforderlichen Einrichtungen dargestellt.The drawing shows a circuit diagram for a control sector of the steam turbine with the devices required for the invention.

Gezeigt ist eine Sektorsteuerung mit vier Ventilen 5, von denen jedes jeweils einen Sektor versorgt und die nacheinander an einer gemeinsamen Dampfzuführung 14 angeordnet sind. Über den Umfang der Dampfturbine sind mehrere derartige Regelungssektoren vorhanden, wobei die automatische Steuerung für die Turbine meist so arbeitet, daß bei kleinen Lastschwankungen von einer Grundeinstellung für alle Ventile aus nur die Ventile 5 eines der Sektoren in ihrer Stellung verändert werden, und die übrigen Sektoren bei der Grundeinstellung verbleiben.Shown is a sector control with four valves 5, each of which supplies a sector and which are arranged one after the other on a common steam supply 14. There are several such control sectors over the scope of the steam turbine, with the automatic control for the turbine usually working in such a way that, in the event of small load fluctuations, from a basic setting for all valves, only the valves 5 of one of the sectors are changed in their position, and the other sectors remain with the basic setting.

Der Durchlaß 15 von den einzelnen Ventilen 5 führt zum Leitapparat der Turbine. Die einzelnen Regelungssektoren können selbstverständlich eine andere als die gezeigte Anzahl von Ventilen aufweisen, wobei Regelungen mit getrennt gesteuerter Zufuhrleitung für jedes Ventil 5 durchaus bekannt sind.The passage 15 from the individual valves 5 leads to the turbine nozzle. The individual control sectors can of course have a different number of valves than that shown, controls with a separately controlled supply line for each valve 5 being well known.

In der Zeichnung führt eine gemeinsame Druckölleitung 4, deren Druck von der automatischen Steuereinrichtung für die Turbine geregelt wird, mit ihren Zweigleitungen 4′ zu den einzelnen Kolben-Zylindereinheiten 10 der Ventile 5. Diese Kolben-Zylindereinheiten arbeiten gegen den Druck von die Ventile in Schließrichtung beaufschlagenden Federn, so daß der in der Druckölleitung 4 bzw. den Zweigleitungen 4′ herrschende Öldruck die Öffnungsstellung der einzelnen Ventile bestimmt.In the drawing, a common pressure oil line 4, the pressure of which is regulated by the automatic control device for the turbine, leads with its branch lines 4 'to the individual piston-cylinder units 10 of the valves 5. These piston-cylinder units work against the pressure of the valves in the closing direction Acting springs, so that the prevailing in the pressure oil line 4 or the branch lines 4 'oil pressure determines the opening position of the individual valves.

In die einzelnen Zweigleitungen 4′ sind von Magneten 16 betätigbare Umschaltventile 3 vorgesehen, die an eine gemeinsame Testregelleitung 11 zusätzlich angeschlossen sind. Durch wahlweise Betätigung der Magnete 16 über die elektrischen Leitungen vom Testgerät 1 aus können die Kolben-Zylindereinheiten 10 einzeln an die Testregelleitung 11 angeschlossen werden, wobei gleichzeitig eine Abkoppelung von der Zuführ-Zweigleitung 4'' erfolgt.In the individual branch lines 4 '16 switchable valves 3 are provided, which are additionally connected to a common test control line 11. By optionally actuating the magnets 16 via the electrical lines from the test device 1, the piston-cylinder units 10 can be individually connected to the test control line 11, at the same time being disconnected from the supply branch line 4 ″.

Zwischen der Druckleitung 4 und der Testregelleitung 11 ist eine Abgleicheinrichtung 12 bestehend aus einem Differentialdruckmesser eingebaut, der seine Messwerte über eine Leitung 18 an das Testgerät 1 weitergibt.Between the pressure line 4 and the test control line 11, a balancing device 12 consisting of a differential pressure meter is installed, which transmits its measured values via a line 18 to the test device 1.

In die Testregelleitung 11 ist ein vom Testgerät regelbarer Druckwandler 2 eingebaut, dessen Zuleitung 6′ an eine Öldruckleitung 6 angeschlossen ist, in welcher ein höherer Druck herrscht als der maximale Steuerdruck in der Regeldruckleitung 4.In the test control line 11, a pressure transducer 2 that can be regulated by the test device is installed, the supply line 6 'of which is connected to an oil pressure line 6, in which a higher pressure than the maximum control pressure in the control pressure line 4 prevails.

Wenn die Steuereinrichtung, wie es in der Zeichnung gezeigt ist, mit einer hydraulischen Schnellschlußsteuerung versehen ist, die aus in den einzelnen Kolben-Zylindereinheiten 10 angeordneten Sicherheitsventilen besteht, die gegen den Druck, mit welchem die Kolben der Kolben-Zylindereinheit 10 betätigt werden, über eine Druckleitung 6, 6˝ geschlossen gehalten werden, wobei diese Druckleitung 6 im Falle einer Schnellabschaltung der Turbine, durch die Regeleinrichtung vom Öldruckerzeuger abgekoppelt und an eine Rücklaufleitung (nicht gezeigt) zum Ölvorratsbehälter angeschlossen werden kann, wird diese Leitung 6 mit Vorteil bei der erfindungsgemäßen Testeinrichtung verwendet, da hierbei auch sofort die Zuleitung 6′ zur Testregelleitung 11 drucklos wird. Das Testgerät 1 selbst wird in vorteilhafter Weise ebenfalls an eine Stromversorgung 7 angeschlossen, welche im Falle einer vorerwähnten Schnellabschaltung der Turbine automatisch unterbrochen wird.If the control device, as shown in the drawing, is provided with a hydraulic quick-closing control, which consists of safety valves arranged in the individual piston-cylinder units 10, which act against the pressure with which the pistons of the piston-cylinder unit 10 are actuated a pressure line 6, 6˝ are kept closed, this pressure line 6 in the event of a rapid shutdown of the turbine, can be decoupled from the oil pressure generator by the control device and connected to a return line (not shown) to the oil reservoir, this line 6 is advantageous in the invention Test device used, since the supply line 6 'to the test control line 11 is immediately depressurized. The test device 1 itself is also advantageously connected to a power supply 7, which is automatically interrupted in the event of the aforementioned rapid shutdown of the turbine.

Die Arbeitsweise der beschriebenen Einrichtung ist folgende: Das Testgerät 1 wird an einer der vorgesehenen Anschlußstellen für die einzelnen Regelsektoren mit den elektrischen Leitungen 17 für die Magnete 16, die Meldeleitung 18 für den Differenzdruckanzeiger 12 und die Steuerleitung 19 für den Druckwandler 2 angeschlossen. Dann wird der Druckwandler über die Steuerleitung 19 so eingestellt, daß der Druck in der Testregelleitung 11 demjenigen in der Regeldruckleitung 4 bzw. 4′ entspricht, was vom Differenzdruckmesser 12 über die Leitung 18 angezeigt wird. Wenn Druckgleichheit in den beiden Leitungen 4 und 11 herrscht, wird über die entsprechende Leitung 17 einer der Magnete 16 betätigt, wodurch das ihm zugeordnete Umschaltventil 3 die Druckversorgung für die zugehörige Kolben-Zylindereinheit 10 an die Leitung 11 anschließt. In dem Testgerät ist eine Sicherheitsvorrichtung eingebaut, welche eine Betätigung der Magnete 16 nur bei Druckgleichheit in den beiden Leitungen 4 und 11 gestattet. Nunmehr kann durch langsames Ändern des Druckes in der Testregelleitung 11, damit die automatische Regeleinrichtung durch Steuerung der Ventile 5 in den anderen Sektoren bzw. im vorgesehenen Regelsektor ohne Beeinträchtigung des Betriebes den sich ändernden Dampfdurchfluß ausgleichen kann, das zu testende Ventil 5 über seinen Gesamthub ein oder mehrmals verstellt werden. Die Kontrolle dafür, daß das Ventil über seinen ganzen Hubweg verstellt wird, kann auf verschiedene Weise, z.B. durch Messung, Endschalter, oder durch Rückrechnung aus den Daten, welche die automatische Regelung während des Testvorganges liefert, erhalten werden. Dieser Vorgang wird für jedes der Ventile 5 in dem Regelsektor wiederholt.The operation of the device described is as follows: The test device 1 is connected to one of the connection points provided for the individual control sectors with the electrical lines 17 for the magnets 16, the signal line 18 for the differential pressure indicator 12 and the control line 19 for the pressure converter 2. Then the pressure transducer is set via the control line 19 so that the pressure in the test control line 11 corresponds to that in the control pressure line 4 or 4 ', which is indicated by the differential pressure meter 12 via line 18. If pressure is equal in the two lines 4 and 11, one of the magnets 16 is actuated via the corresponding line 17, as a result of which the changeover valve 3 assigned to it connects the pressure supply for the associated piston-cylinder unit 10 to the line 11. A safety device is installed in the test device, which allows actuation of the magnets 16 only when the pressure in the two lines 4 and 11 is equal. Now, by slowly changing the pressure in the test control line 11 so that the automatic control device can compensate for the changing steam flow by controlling the valves 5 in the other sectors or in the intended control sector, the valve 5 to be tested over its entire stroke or be adjusted several times. The control that the valve is moved over its entire stroke can be done in various ways, e.g. by measurement, limit switch, or by back calculation from the data which the automatic control provides during the test process. This process is repeated for each of the valves 5 in the control sector.

Nach Beendigung des Testvorganges für das gerade geprüfte Ventil 5 wird der Druck in der Leitung 11 wieder mit dem in der Regeldruckleitung 4 herrschenden Druck abgeglichen und dann erst durch Betätigung des Magneten 16 das Umschaltventil 3 wieder auf die Versorgung der Kolben-Zylindereinheit über die Regelleitung 4 umgestellt.After the end of the test process for the valve 5 that has just been tested, the pressure in line 11 is again compared with the pressure prevailing in the regulating pressure line 4 and then the switching valve 3 is only opened again by actuating the magnet 16 the supply of the piston-cylinder unit changed over the control line 4.

Die Überprüfung der einzelnen Ventile 5 auf ihre vollen Hubeigenschaften kann selbstverständlich dann nicht durchgeführt werden, wenn die Turbine entweder mit voller Belastung arbeitet, d.h. mit allen Ventilen voll geöffnet, oder mit minimaler Teillast, so daß nur ein Ventil zum Teil geöffnet ist.Of course, the checking of the individual valves 5 for their full lifting properties cannot be carried out if the turbine is either operating at full load, i.e. with all valves fully open, or with minimal partial load, so that only one valve is partially open.

Die erfindungsgemäße Testeinrichtung bietet zum einen den Vorteil, daß sämtliche Ventile, die Fehler aufweisen, genau festgestellt werden können und zum anderen den Vorteil, daß Störungen des Ventiles durch regelmäßige Betätigungen (beim Test) gar nicht erst auftreten.The test device according to the invention has the advantage, on the one hand, that all valves which have faults can be determined precisely, and, on the other hand, the advantage that valve malfunctions from regular actuations (during the test) do not even occur.

Das Testgerät kann auch mit einem Maximal- und Minimaldruckbegrenzer ausgerüstet sein, so daß Verstellungen des Testregeldruckes nur in dem Bereich wirksam durchgeführt werden können, in welchem die Regeleinrichtung über die Regelöldruckleitung 4 arbeitet, um Fehlbedienungen bei kleiner oder sehr großer Last zu verhindern.The test device can also be equipped with a maximum and minimum pressure limiter, so that adjustments of the test control pressure can only be carried out effectively in the area in which the control device operates via the control oil pressure line 4 in order to prevent incorrect operation under small or very large loads.

Claims (8)

  1. Method of testing the individual valves in steam turbines with individual or group valve control, where the valves (5) are each provided with a hydraulic actuator (10) which is operable by a pressure oil line (4, 4') under the influence of an automatic control device counter to the action of a spring loading the valve (5) in closing direction, wherein the supply line (4'') for the pressure oil of the valve (5) to be tested is closed off from the pressure oil line (4, 4') under the influence of the automatic control device and is connected to a test control line (11), in which is generated an oil pressure which is adjustable independently of the automatic control line, and wherein as a result of the check-back indication of comparison devices such as, for example, oil pressure gauges or control output indicators the method of functioning of the valve (5) in question is checked, characterized in that the oil pressure in the test control line (11) is balanced with the oil pressure in the supply line (4') and only after check-back indication that balancing has been effected is the connection between the supply line (4'') and the test control line (11) opened.
  2. Method according to claim 1, characterized in that the pressure in the test control line (11) is adjusted in such a way that the valve (5) to be tested is moved at least once over its total stroke.
  3. Method according to claim 2, characterized in that the pressure in the test control line (11) is varied so slowly that the automatic control device by controlling at least one of the non-tested valves (5) may compensate the disturbance of operation resulting from the movement of the valve to be tested.
  4. Method according to claim 1, characterized in that the test control line (11) is possibly connected to a hydraulic emergency trip control so that, in the event of a turbine trip, the test control line (11) is rendered unpressurized.
  5. Method according to claim 1, characterized in that on completion of the valve test the reconnection of the supply line (4') to the pressure oil line (4) under the influence of the automatic control device is effected only after check-back indication that the balancing of the oil pressure in the corresponding lines has been effected.
  6. Test device for the individual valves in steam turbines with individual or group valve control for effecting the method according to claim 1, wherein the valves (5) are each provided with a hydraulic actuator which is operable by a pressure oil line (4, 4') under the influence of an automatic control device counter to the action of a spring loading the valve (5) in closing direction, and in which each actuator (10) is selectively connectable to a test control line (11) of the test device, in which test device, with the aid of a pressure control for the pressure oil which is independent of the automatic control device and with the aid of suitable comparison devices such as, for example, oil pressure measurement or control output change measurement of the automatic control device, the method of functioning of the valve (5) situated in the test circuit may be checked, characterized in that the test device is provided with a balancing device (12) for adjusting the pressure in the test control line (11) to the pressure prevailing in the pressure oil supply line (4) upstream of the changeover valve (3) prior to the start and at the end of the test process, and that disposed upstream of each supply line (4'') for the pressure oil to the individual actuators (10) is a changeover valve (3) which is blocked by a test appliance (1) up to check-back indication from the balancing device (12) of equal pressure in the supply lines (4, 4') and in the test line (11) and may only be opened after check-back indication.
  7. Test device according to claim 6, characterized in that, when an emergency trip line (6) for the individual valves (5) is provided which is subject to a higher pressure than the control line (4), the test device is connected via an adjustable pressure transducer (2) to the emergency trip line (6).
  8. Test device according to claim 6 or 7, characterized in that the power supply for the test appliance (1) may be disconnected by the automatic control device upon operation of the emergency trip device.
EP19890890329 1988-12-28 1989-12-20 Testing method of individual valves of steam turbines and testing device for carrying out the method Expired - Lifetime EP0376914B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT3177/88 1988-12-28
AT317788A AT400172B (en) 1988-12-28 1988-12-28 METHOD FOR TESTING AND TESTING DEVICE FOR STEAM TURBINE CONTROL VALVES

Publications (3)

Publication Number Publication Date
EP0376914A2 EP0376914A2 (en) 1990-07-04
EP0376914A3 EP0376914A3 (en) 1991-07-24
EP0376914B1 true EP0376914B1 (en) 1994-04-13

Family

ID=3546539

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890890329 Expired - Lifetime EP0376914B1 (en) 1988-12-28 1989-12-20 Testing method of individual valves of steam turbines and testing device for carrying out the method

Country Status (3)

Country Link
EP (1) EP0376914B1 (en)
AT (1) AT400172B (en)
DE (1) DE58907465D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0433791B1 (en) * 1989-12-21 1994-04-06 Asea Brown Boveri Ag Actuator for a feeding valve
DE59103692D1 (en) * 1991-01-25 1995-01-12 Asea Brown Boveri Connection valve and hydraulic safety and power oil system in which the connection valve is used.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL93350C (en) * 1953-11-24
US2998017A (en) * 1960-03-28 1961-08-29 Gen Electric Emergency governor exerciser
US3382880A (en) * 1965-12-01 1968-05-14 Gen Electric Automatic trip test system
CH514067A (en) * 1970-03-31 1971-10-15 Bbc Brown Boveri & Cie Method and device for testing monitoring bodies on a turbine system
US3682564A (en) * 1971-04-26 1972-08-08 Laval Turbine Turbine overspeed trip system with testing mechanism
US4059960A (en) * 1976-03-11 1977-11-29 Westinghouse Electric Corporation Method and apparatus for testing the movability of valve plugs
US4019390A (en) * 1976-04-22 1977-04-26 Westinghouse Electric Corporation System and method for complete on line testing of a mechanical overspeed trip channel associated with an electrohydraulic emergency trip system for a turbine power plant
US4343454A (en) * 1980-06-26 1982-08-10 General Electric Company Apparatus for individual isolation of hydraulically actuated valves

Also Published As

Publication number Publication date
ATA317788A (en) 1995-02-15
EP0376914A3 (en) 1991-07-24
AT400172B (en) 1995-10-25
DE58907465D1 (en) 1994-05-19
EP0376914A2 (en) 1990-07-04

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