EP0911846A1 - Verfahren zur hochgenauen Bestimmung von Leckraten in die Verkapselung eines elektrisches Gerätes - Google Patents

Verfahren zur hochgenauen Bestimmung von Leckraten in die Verkapselung eines elektrisches Gerätes Download PDF

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Publication number
EP0911846A1
EP0911846A1 EP98402639A EP98402639A EP0911846A1 EP 0911846 A1 EP0911846 A1 EP 0911846A1 EP 98402639 A EP98402639 A EP 98402639A EP 98402639 A EP98402639 A EP 98402639A EP 0911846 A1 EP0911846 A1 EP 0911846A1
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EP
European Patent Office
Prior art keywords
envelope
temperature
pressure
values
index
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.)
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Application number
EP98402639A
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English (en)
French (fr)
Inventor
Jean-Pierre Dupraz
Edmond Thuries
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.)
Grid Solutions SAS
Original Assignee
GEC Alsthom T&D SA
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Filing date
Publication date
Application filed by GEC Alsthom T&D SA filed Critical GEC Alsthom T&D SA
Publication of EP0911846A1 publication Critical patent/EP0911846A1/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 invention relates to a method for determining a leak rate. from a series of density values of a contained dielectric gas under pressure in an envelope inside which is arranged an electrical device crossed by an electric current, each density value being calculated by a unit of recording and processing from corresponding pairs of pressure values and temperature delivered simultaneously by a pressure sensor and by a temperature sensor fixed on the envelope from the outside and communicating with the dielectric gas.
  • a distribution network or generator circuit breaker constitutes an application of such electrical equipment, in which the dielectric gas contained in the envelope is for example sulfur hexafluoride SF 6 .
  • the dielectric gas contained in the envelope is for example sulfur hexafluoride SF 6 .
  • SF 6 is used to extinguish an electric arc which forms in the envelope during l opening of the circuit breaker.
  • the pressure sensor and the temperature sensor are mounted from the outside on the envelope and communicate with the gas dielectric by a conduit formed in the thickness of the envelope.
  • Each record of measured pressure and temperature simultaneously by these sensors allows to calculate a value of density which is representative of the actual density of the dielectric gas contained in the envelope to the nearest measurement uncertainties.
  • Temperature compensation reveals itself insufficient to guarantee such precise control, since the measured pressure value is corrected with respect to the value measured from the temperature and not from the actual value of the temperature of the dielectric gas contained in the envelope.
  • the object of the invention is to improve the measurement accuracy of a leakage rate of a dielectric gas contained in an envelope of a electrical equipment.
  • the subject of the invention is a method for determining a leak rate from a series of gas density values dielectric contained under pressure in an envelope inside which is placed an electrical apparatus crossed by a current electric, each density value being calculated by a unit recording and processing from corresponding couples pressure and temperature values delivered simultaneously by a pressure sensor and a temperature sensor fixed on the envelope from the outside and communicating with the dielectric gas, characterized in that each density value is indexed by unit recording and processing according to a current value electric and a value of a climatic parameter of a medium in which is placed the envelope, recorded simultaneously at each corresponding couple of pressure and temperature values, for determine the leak rate from indexed leak rates which are obtained from density values indexed by the same index.
  • the values of the electric current flowing electrical equipment are recorded to take into account a heat exchange between this equipment and the dielectric gas contained in the envelope.
  • the values of the parameter of the environment in which the envelope is placed are recorded to take into account a heat exchange between the medium and the temperature sensor attached to the enclosure.
  • Recording an electric current value and a value of the climatic parameter simultaneously with each couple corresponding pressure and temperature values allows the recording and processing unit to assign the same index to density values associated with electric current values close to each other and to values of the climatic parameter also close to each other.
  • an indexed leakage rate calculated from density values of the same index, depends only in one way negligible the substantially constant gap between the actual temperature of the dielectric gas and the temperature measured by the sensor fixed on the envelope. The measurement accuracy of the indexed leakage is thus improved, as is the determination of the leak rate, obtained by an average indexed leak rate.
  • Figure 1 is a block diagram including an apparatus electric on which is implemented the method according to the invention.
  • Figure 2 shows a series of recordings made according to the method of the invention.
  • Figure 3 shows two plots for calculating an indexed leak rate according to the method of the invention.
  • FIG. 1 An electrical apparatus, for example a circuit breaker, is shown diagrammatically, FIG. 1, in the form of a tank 4 arranged in a cylindrical envelope 1 filled with a dielectric gas 7 such as SF 6 under a pressure of a few bars.
  • the circuit breaker is connected to two current leads 3 and 5.
  • a pressure sensor and a temperature sensor are attached on the envelope from the outside.
  • the pressure sensor 11 is equipped with a temperature sensor internal, and does not require mounting a second temperature.
  • the pressure sensor communicates with the dielectric gas contained in the envelope by a relatively narrow conduit 9 which contains the temperature probe and a pressure sensor, for example an elastic membrane.
  • the pressure sensor 11 delivers to a unit recording and processing 13 a couple of pressure values P and temperature T acquired simultaneously.
  • the couples of values are recorded for example every hour during a time period of one year to form an annual series of records. It is also planned to record the couples of pressure and temperature values sporadically during this period of time, for example on each change significant of the measured temperature.
  • Each pair of values is processed by the recording and processing unit 13 to calculate a value of the density of the dielectric gas contained in the envelope in using for example an empirical equation of state known in the literature.
  • the method provides for simultaneous recording for each pair of pressure and temperature values, a value of the electric current flowing through the electrical equipment, and a value of a climatic parameter of the environment in which is arranged the enclosure.
  • a first measuring device 17 of the type of an ammeter is arranged in bypass on the two current leads 3 and 5 to deliver to the recording unit and processing 13 a value of the intensity I of the electric current.
  • a second measuring device 15 comprising a thermometer is placed in the ambient medium of the envelope 3 which is generally atmospheric air, for delivering to the recording and processing unit 13 a value of the temperature T ext of the air.
  • the measuring device 15 It is planned to measure with the measuring device 15 other climatic parameters of the ambient environment of envelope 3, such as for example, the solar radiation directed on the envelope, the degree atmospheric humidity, or wind speed, the measure 15 being equipped with sensors corresponding to each of these climatic parameters.
  • the values of the electric current and the climatic parameter are processed by unit 13 to assign an index to the value of the density calculated from each corresponding pair of values pressure and temperature.
  • n 10 records acquired by the unit 13, which each include a pair of pressure values P n and temperature T n , an electric current value, and a temperature value air.
  • An index consists of a range of current values electric combined with an interval of climatic parameter values.
  • the four ranges of electric current values and the three outdoor temperature value ranges form per meeting two to two twelve separate indexes C1 to C12.
  • the four density values determined from records that have the numbers 1, 4, 8 and 10 are associated with four electric current values allowed in the same first interval I1 and at four permissible air temperature values in the same second interval I5. These four densities have the same index C1 defined by the union of the interval I1 and I5.
  • the six density values determined from records that bear the numbers 2, 3, 5, 6, 7 and 9 are associated with six values of electric current accepted in the same first interval I4 and at six permitted air temperature values in the same second interval I5. These six densities have the same index C10 defined by the meeting of the interval I4 and I5.
  • figure 2 which includes only one parameter climatic, easily generalized to several parameters climatic conditions.
  • FIG 3 we have reported density values as a function of the number of the records for the indexes C1 and C10 shown in Figure 2 and symbolized respectively by triangles and squares. These values are organized into two distinct sets which roughly draw two lines.
  • the recording and processing unit 13 performs on each set of density values of the same index, a linear regression and calculates a leakage rate indexed ⁇ 1 and ⁇ 10 by the slope of each of the two lines.
  • the two lines are substantially parallel between them and that they are offset in the direction of the axis which carry the density values. This shift is interpreted by two temperature differences between the temperature measured by the sensor and the actual temperature of the dielectric gas substantially constant for each line but different from one line to another.
  • the parallelism of straight lines illustrates that any constant deviation is practically without influence on the indexed leakage rate calculated from values of density with the same index.
  • the accuracy of measuring leakage rates indexed and that of the leakage rate ⁇ , obtained by an average rate leakage indexed, is higher as the value intervals of the electric current and the climatic parameter gathered in an index are narrower.

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  • Examining Or Testing Airtightness (AREA)
  • Gas-Insulated Switchgears (AREA)
EP98402639A 1997-10-23 1998-10-23 Verfahren zur hochgenauen Bestimmung von Leckraten in die Verkapselung eines elektrisches Gerätes Withdrawn EP0911846A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9713289 1997-10-23
FR9713289A FR2770294B1 (fr) 1997-10-23 1997-10-23 Procede pour determiner avec une grande precision un taux de fuite d'une enveloppe d'appareillage electrique

Publications (1)

Publication Number Publication Date
EP0911846A1 true EP0911846A1 (de) 1999-04-28

Family

ID=9512554

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98402639A Withdrawn EP0911846A1 (de) 1997-10-23 1998-10-23 Verfahren zur hochgenauen Bestimmung von Leckraten in die Verkapselung eines elektrisches Gerätes

Country Status (6)

Country Link
US (1) US6205846B1 (de)
EP (1) EP0911846A1 (de)
JP (1) JPH11201857A (de)
CA (1) CA2250335A1 (de)
FR (1) FR2770294B1 (de)
ID (1) ID21713A (de)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6691556B2 (en) * 2002-05-20 2004-02-17 General Electric Company Automatic data logging kit and method
FR2872572B1 (fr) * 2004-06-30 2006-09-22 Commissariat Energie Atomique Test de l'etancheite de mems ou de petits composants encapsules
FR2876183B1 (fr) * 2004-10-01 2007-01-05 Gaz De France Procede et dispositif de controle d'etancheite d'une enceinte contenant un gaz sous pression
US7257496B2 (en) * 2005-07-28 2007-08-14 Avistar, Inc. Method and apparatus for monitoring SF6 gas and electric utility apparatus
FR2906653B1 (fr) * 2006-09-28 2008-12-19 Areva T & D Sa Dispositif de controle du fonctionnement d'un densimetre pour appareil electrique moyenne et haute tension et procede de controle du fonctionnement d'un densimetre
WO2011134566A2 (de) * 2010-04-30 2011-11-03 Maschinenfabrik Reinhausen Gmbh Verfahren zur überwachung von isoliergasen
WO2012119082A1 (en) 2011-03-02 2012-09-07 Franklin Fueling Systems, Inc. Gas density monitoring system
PL2817815T3 (pl) 2012-02-20 2016-11-30 System monitorowania wilgolności
DE102013007751A1 (de) * 2013-05-07 2014-11-27 Abb Technology Ag Überwachungs- und Auswertevorrichtung und Verfahren für die Bestimmung einer lsoliergasmenge in gasisolierten Schaltanlagen sowie in Prüfsystemen für Schaltanlagen
WO2016115388A1 (en) * 2015-01-15 2016-07-21 Solon Manufacturing Company Gas measurement apparatus
DE102015219982A1 (de) * 2015-10-14 2017-04-20 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Überprüfung der Dichtigkeit eines Druckbehälters von einem Kraftfahrzeug
GB2586651A (en) 2019-09-02 2021-03-03 Rolls Royce Plc Power electronics unit
DE102020204624A1 (de) * 2020-04-09 2021-10-14 Siemens Aktiengesellschaft Ermitteln einer Fluiddichte in einer elektrischen Vorrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0637114A1 (de) * 1993-07-30 1995-02-01 Consolidated Electronics, Inc. Hochspannungsübertragung-Schaltanlage mit Gasüberwachungseinrichtung
US5502435A (en) * 1994-04-06 1996-03-26 Ralston; Douglas E. Method and system for monitoring circuit breaker gas pressure
EP0726630A1 (de) * 1995-02-08 1996-08-14 Gec Alsthom T Et D Sa Verfahren und Vorrichtung zur Bestimmung der Dichte eines Isoliergases in einer elektrischen Anlage

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3934454A (en) * 1974-12-04 1976-01-27 Allis-Chalmers Corporation Gas conditioner and analyzer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0637114A1 (de) * 1993-07-30 1995-02-01 Consolidated Electronics, Inc. Hochspannungsübertragung-Schaltanlage mit Gasüberwachungseinrichtung
US5502435A (en) * 1994-04-06 1996-03-26 Ralston; Douglas E. Method and system for monitoring circuit breaker gas pressure
EP0726630A1 (de) * 1995-02-08 1996-08-14 Gec Alsthom T Et D Sa Verfahren und Vorrichtung zur Bestimmung der Dichte eines Isoliergases in einer elektrischen Anlage

Also Published As

Publication number Publication date
CA2250335A1 (fr) 1999-04-23
ID21713A (id) 1999-07-15
FR2770294A1 (fr) 1999-04-30
FR2770294B1 (fr) 1999-12-03
US6205846B1 (en) 2001-03-27
JPH11201857A (ja) 1999-07-30

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