EP1906424A1 - Vorrichtung zur Steuerung des Betriebs eines Dichtemessers für ein elektrisches Gerät mit Mittel- und Hochspannung und Verfahren zur Steuerung des Betriebs eines Dichtemessers - Google Patents

Vorrichtung zur Steuerung des Betriebs eines Dichtemessers für ein elektrisches Gerät mit Mittel- und Hochspannung und Verfahren zur Steuerung des Betriebs eines Dichtemessers Download PDF

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Publication number
EP1906424A1
EP1906424A1 EP07117218A EP07117218A EP1906424A1 EP 1906424 A1 EP1906424 A1 EP 1906424A1 EP 07117218 A EP07117218 A EP 07117218A EP 07117218 A EP07117218 A EP 07117218A EP 1906424 A1 EP1906424 A1 EP 1906424A1
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EP
European Patent Office
Prior art keywords
chamber
densimeter
control device
cover
volume
Prior art date
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Granted
Application number
EP07117218A
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English (en)
French (fr)
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EP1906424B1 (de
Inventor
David Chambon
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Grid Solutions SAS
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Areva T&D SAS
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Publication of EP1906424A1 publication Critical patent/EP1906424A1/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/56—Gas reservoirs
    • H01H33/563—Gas reservoirs comprising means for monitoring the density of the insulating gas

Definitions

  • the present invention relates to a device for controlling a densimeter for monitoring a leakage rate of a medium and high voltage electrical equipment envelope filled with a dielectric gas under pressure, whose polluting effects on the environment are reduced and to a method of controlling the operation of said sensor.
  • a densimeter or density sensor is applied, for example, to a switch or circuit breaker, to an insulated or metallic envelope station or to a sealed metallic envelope station containing a dielectric gas, for example sulfur hexafluoride (SF6) under a pressure of a few bars.
  • a dielectric gas for example sulfur hexafluoride (SF6)
  • the densimeter is attached to the casing and is subjected to gas pressure in order to continuously measure the gas pressure in the casing. Even small leaks being unavoidable, the density or pressure of the dielectric gas in the envelope tends to decrease. Below a predetermined threshold, the operation of the circuit breaker is no longer safe. It is then necessary to inject a certain amount of gas in order to return to above the critical threshold.
  • SF6 sulfur hexafluoride
  • Such densimeters are for example known documents FR 2,770,295 , WO 2004/027804 and US 6,293,914 .
  • the densimeters comprise two contact thresholds swinging during a loss of density of gas in the envelope
  • the first contact threshold corresponds to a so-called "alarm" threshold P1 which informs the operator of the necessity to intervene on the apparatus to carry out additional filling
  • the second threshold P2 corresponds to a density value below which the electrical characteristics and the cut-off performance of the gas pressure apparatus are no longer guaranteed, in particular, the power failure during a short-circuit fault, depending on the conditions and / or the operating obligations of the network.
  • the customer will immediately give, as soon as this second threshold is reached, an opening order and lock it in the open position or it will hold it in the closed locked position according to several parameters, notably the variation of the pressure and the temperature. of gas, the breaking performance of currents of the electrical equipment.
  • the densimeter is then an important safety organ; therefore, the proper functioning of the contacts should be monitored regularly on the basis of a pressure / temperature scale.
  • Such verification is carried out at regular intervals by simulating leakage of the dielectric gas, in particular during preventive maintenance.
  • the densimeter is isolated from the inner volume of the envelope, which is then isolated in a chamber. Then the gas is flown to the outside environment and the behavior of the density meter is checked, to verify that it actually detects the pressure drop during the leakage of gas to the outside environment, and that it reacts. Consequently.
  • SF6 gas is a greenhouse gas and it is best to control leaks in the outdoor environment.
  • a device for controlling the operation of a densimeter comprising a sealed chamber with respect to the external environment, the volume of which can increase to lower its internal pressure in dielectric gas at a threshold of tripping of the electrical apparatus, the densimeter being able to measure the gas pressure in said chamber.
  • the gas leak is thus simulated by the lowering of the gas pressure in a closed chamber whose volume has increased.
  • the isolation means comprise a valve whose opening and closing are controlled by changing the volume of the closed chamber. It is then not necessary to provide for synchronizing the isolation of the closed chamber and the change in the volume of the closed chamber, the control device is then simple to implement.
  • the control device comprises for example a body integral with the envelope and a cover, said body and said cover defining the closed chamber, said cover being able to slide in a sealed manner in the body to modify the volume of the closed chamber.
  • the lid controls the opening and closing of the valve.
  • the valve may comprise a rod and a shutter, said shutter being intended to cooperate sealingly with a seat bordering a communication passage between the closed chamber and the interior space of the envelope, said rod being able to be displaced by the lid to control the opening and closing of the valve.
  • the order is very simple and robust.
  • the control device comprises, for example screws connecting the cover to the body and allowing said cover to slide on a determined stroke.
  • the present invention also relates to a medium and high voltage electrical apparatus in a sealed metal envelope filled with dielectric gas under pressure comprising at least one control device according to the present invention and a densimeter capable of measuring the pressure in the chamber of the control device. .
  • the isolation of the densimeter is advantageously caused by the expansion of the volume of the chamber.
  • the step of verifying the behavior of the densimeter provides for the detection of a switch of alarm contacts and an opening of the circuit breaker.
  • FIG. 1 shows a diagrammatic sectional view of an exemplary embodiment of a device for controlling the operation of a densimeter according to the present invention mounted on a metal casing 4 of a circuit breaker or apparatus. electric high voltage.
  • the envelope defines an interior space 5 filled with a dielectric gas under pressure, for example sulfur hexafluoride (SF6) at a gas pressure of 7 bar effective at 20 ° C.
  • a dielectric gas under pressure for example sulfur hexafluoride (SF6) at a gas pressure of 7 bar effective at 20 ° C.
  • the control device comprises a housing 6 integral with the casing 4. In the example shown, it is in one piece with the casing 4, which makes it possible to avoid sealing problems between the casing and the envelope 4.
  • the housing 6 delimits an interior chamber 8 adapted to be placed in communication with the interior space 5 of the envelope 4 by a channel 9.
  • the pressure in the chamber 8 is equal to that prevailing in the space 5.
  • a densimeter 2 is, in the example shown, mounted in a sealed manner on the housing 4 and intended to measure the pressure of SF6 in the chamber 8.
  • the densimeter is capable of detecting at least one pressure threshold, advantageously two pressure thresholds; a first threshold P1 corresponding to an alarm threshold corresponding to the need to intervene on the densimeter, and a second threshold P2 corresponding to the case where the operation of the electrical equipment is no longer guaranteed, in particular the power failure during a fault in short circuit. In the latter case, the device is either opened and locked in this position, or locked in the closed position.
  • the densimeter 2 is connected to a processing unit (not shown) able to indicate to the users the state of the electrical equipment.
  • the chamber 8 has a volume able to vary.
  • the housing 6 comprises an upper portion 12 forming a lid and a body 14 on which is mounted in a sealed manner the lid 12.
  • the lid 12 is able to move in a sealed manner with respect to the body so as to modify the volume of the chamber 8.
  • the cover 12 has a smaller diameter portion 12.1 and a larger diameter portion 12.2 forming a base, the smaller diameter portion 12.1 being slidably mounted in the body 14.
  • Dynamic sealing means 16 are provided between the cover 12 and the body 14 in order to ensure frictional sealing during the displacement of the cover in the body 14. These are for example mounted in a groove on a periphery outside of the smaller diameter part 12.1.
  • the sealing means are for example an O-ring or a lip seal
  • the base 12.2 is intended to bear against a free end 14.1 of the body 14.
  • the control device also comprises a means 10 for sealingly isolating the chamber 8 from the volume 5.
  • the means 10 is formed by a valve comprising a shutter 18 and a seat 20 bordering the channel 9.
  • the shutter 18 is resiliently urged into contact with the seat 20 to close the channel 9, for example by means of a helical spring 25.
  • valve stem 22 integral with the shutter 18, mounted in the channel 9 and projecting into the chamber 8.
  • a free end 22.1 of the valve stem 22 is adapted to come into contact with the cover 12 and to be moved in the opening direction of the valve indicated by the arrow F by the cover 12.
  • the spring 25 is mounted in reaction between an end 9.1 of the channel 9 opposite that carrying the valve seat 20 and the free end 22.1 of the valve stem 22.
  • This embodiment has the advantage of being simple and robust; it is not necessary to provide an external control, bulky and weathered. In addition, the control of the valve is effected without the need for additional external elements.
  • a second channel 26 is provided in the cover 12 to bring the gas under pressure to the densimeter. But it can be expected that the densimeter opens directly into the chamber 8.
  • the lid 12 is fixed on the body 14 for example by means of screws not shown, for example four.
  • the control device is in the configuration of Figure 1, the volume of the chamber 8 is minimum.
  • the screws are in a completely loose state the volume of the chamber 8 is maximum.
  • the securing means 24 of the cover 12 on the body 14 are also provided. These means also form guiding means for moving the cover relative to the body in a given stroke in order to avoid a loss of seal between the cover 12 and the body 14.
  • the securing means 14 are for example formed by screws mounted captively on the body 4.
  • the chamber 8 In the normal monitoring state shown in FIG. 1, the chamber 8 is in communication with the space 5. The densimeter then measures the pressure prevailing in the chamber 8 and therefore in the space 5.
  • the screws are gradually unscrewed. At first, the cover 12 moves away from body, bringing the shutter 18 closer to the seat 20, until the latter comes into sealed contact with the seat 20 and isolates the chamber 8 from the space 5. Then, in a second step, the unscrewing screws are continued to cause an additional increase in the volume of the chamber 8.
  • the lid functions as a piston.
  • the alarm contacts switch and the circuit breaker opens. In the opposite case, the densimeter requires an intervention.
  • the initial volume of the chamber 8 and its volume variation are determined so that the pressure in the chamber 8, when its volume is maximum, is less than the second pressure threshold P2 of the circuit breaker. It is also possible that the pressure in the chamber corresponds to the first threshold P1. In this case, it only checks the operation of the alarm and not the switching of the contacts.
  • the densimeter was thus controlled without releasing greenhouse gases in the external environment.
  • no mass of gas is taken from the envelope.
  • the pressure drop is due only to the unavoidable leaks, and not because of the tests.
  • the filling pressure is at 7 effective bars
  • the alarm threshold P1 at 6 bars
  • the threshold P2 at 5.7 bars.
  • the increase in the volume of the chamber 8 is done manually. But it can be provided mechanisms controlled by an electric motor and / or hydraulic cylinders.
  • the control device comprises means for measuring the pressure prevailing in the chamber 8 in order to verify at which pressure value the density meter is actually triggered.
  • these means comprise a channel 28 formed in the cover 12, which opens into the hydrometer channel and outside.
  • a non-return valve is mounted in the channel 28 at its end opening outward to allow connection to a reference pressure gauge or standard gauge or other conventional or electronic reference system (not shown).
  • the standard manometer is connected to the chamber 8 before changing its volume.
  • the densimeter according to the present invention has the advantage of being of very simple construction and operation.

Landscapes

  • Gas-Insulated Switchgears (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Testing Relating To Insulation (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Elimination Of Static Electricity (AREA)
  • Protection Of Static Devices (AREA)
EP07117218A 2006-09-28 2007-09-26 Vorrichtung zur Steuerung des Betriebs eines Dichtemessers für ein elektrisches Gerät mit Mittel- und Hochspannung und Verfahren zur Steuerung des Betriebs eines Dichtemessers Active EP1906424B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0653999A FR2906653B1 (fr) 2006-09-28 2006-09-28 Dispositif de controle du fonctionnement d'un densimetre pour appareil electrique moyenne et haute tension et procede de controle du fonctionnement d'un densimetre

Publications (2)

Publication Number Publication Date
EP1906424A1 true EP1906424A1 (de) 2008-04-02
EP1906424B1 EP1906424B1 (de) 2011-09-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07117218A Active EP1906424B1 (de) 2006-09-28 2007-09-26 Vorrichtung zur Steuerung des Betriebs eines Dichtemessers für ein elektrisches Gerät mit Mittel- und Hochspannung und Verfahren zur Steuerung des Betriebs eines Dichtemessers

Country Status (5)

Country Link
US (1) US7937985B2 (de)
EP (1) EP1906424B1 (de)
CN (1) CN101246107B (de)
AT (1) ATE525737T1 (de)
FR (1) FR2906653B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3100296A1 (de) * 2014-01-29 2016-12-07 General Electric Technology GmbH Elektrisches schaltgerät

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9362071B2 (en) 2011-03-02 2016-06-07 Franklin Fueling Systems, Inc. Gas density monitoring system
US9212966B2 (en) * 2011-08-05 2015-12-15 Solon Manufacturing Company Network manageable advanced gas sensor apparatus and method
IN2014DN07676A (de) 2012-02-20 2015-05-15 Franklin Fueling Systems Inc
CN103323176A (zh) * 2013-07-10 2013-09-25 国家电网公司 一种油气水隔离器
US11867712B2 (en) * 2018-12-18 2024-01-09 Wika Alexander Wiegand Se & Co. Kg Gas densimeter
CN110044420B (zh) * 2019-05-08 2020-06-26 众诚恒祥(北京)科技有限公司 一种温室气体排放量检测装置
CN113324705A (zh) * 2021-04-23 2021-08-31 国网天津市电力公司电力科学研究院 一种燃气机组气门严密性试验方法

Citations (5)

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Publication number Priority date Publication date Assignee Title
FR2170847A1 (de) * 1972-02-03 1973-09-21 Merlin Gerin
EP0476906A2 (de) * 1990-09-17 1992-03-25 Hitachi, Ltd. Schaltvorrichtung
EP0911845A1 (de) * 1997-10-23 1999-04-28 Gec Alsthom T & D Sa Dichtesensor zur Überwachung von Leckraten in die Verkapselung eines elektrisches Gerät, mit verbesserter Zuverlässigkeit
US6293914B1 (en) 1998-08-31 2001-09-25 Acuson Corporation Ultrasonic system and method for measurement of fluid flow
WO2004027804A2 (de) 2002-09-11 2004-04-01 Comde Gmbh Überwachungsanordnung für hochspannungsschaltanlagen

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US2989863A (en) * 1958-05-15 1961-06-27 Gen Electric Gas leakage detecting means
US3273348A (en) * 1963-03-28 1966-09-20 Du Pont Process and apparatus for preparing gaseous mixtures
US4663692A (en) * 1985-06-27 1987-05-05 Westinghouse Electric Corp. Electrical surge arrester and disconnector
DE3732471A1 (de) 1987-09-23 1989-04-13 Siemens Ag Elektrischer druckgas-leistungsschalter, insbesondere sf(pfeil abwaerts)6(pfeil abwaerts)-hochspannungs-leistungsschalter
US5537858A (en) * 1994-05-18 1996-07-23 National Technical Systems, Inc. System for the nonintrusive monitoring of electrical circuit breaker vessel pressure
US5837881A (en) * 1996-12-23 1998-11-17 Martin; Scott Pressure gauge calibrating device
FR2762940B1 (fr) * 1997-04-30 1999-06-04 Gec Alsthom T & D Sa Methode pour surveiller un taux de fuite d'une enveloppe d'appareillage electrique a haute tension
FR2770294B1 (fr) 1997-10-23 1999-12-03 Gec Alsthom T & D Sa Procede pour determiner avec une grande precision un taux de fuite d'une enveloppe d'appareillage electrique
CN2788176Y (zh) * 2005-01-07 2006-06-14 上海航道局 密度计校验装置

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Publication number Priority date Publication date Assignee Title
FR2170847A1 (de) * 1972-02-03 1973-09-21 Merlin Gerin
EP0476906A2 (de) * 1990-09-17 1992-03-25 Hitachi, Ltd. Schaltvorrichtung
EP0911845A1 (de) * 1997-10-23 1999-04-28 Gec Alsthom T & D Sa Dichtesensor zur Überwachung von Leckraten in die Verkapselung eines elektrisches Gerät, mit verbesserter Zuverlässigkeit
FR2770295A1 (fr) 1997-10-23 1999-04-30 Gec Alsthom T & D Sa Capteur de densite pour surveiller un taux de fuite d'une enveloppe d'appareillage electrique avec une fiabilite amelioree
US6293914B1 (en) 1998-08-31 2001-09-25 Acuson Corporation Ultrasonic system and method for measurement of fluid flow
WO2004027804A2 (de) 2002-09-11 2004-04-01 Comde Gmbh Überwachungsanordnung für hochspannungsschaltanlagen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3100296A1 (de) * 2014-01-29 2016-12-07 General Electric Technology GmbH Elektrisches schaltgerät
EP3100296B1 (de) * 2014-01-29 2023-05-24 General Electric Technology GmbH Elektrisches schaltgerät

Also Published As

Publication number Publication date
US7937985B2 (en) 2011-05-10
FR2906653B1 (fr) 2008-12-19
ATE525737T1 (de) 2011-10-15
FR2906653A1 (fr) 2008-04-04
CN101246107A (zh) 2008-08-20
US20080078237A1 (en) 2008-04-03
CN101246107B (zh) 2012-02-22
EP1906424B1 (de) 2011-09-21

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