EP0911845B1 - Capteur de densité pour surveiller un taux de fuite d'une enveloppe d'appareillage électrique avec une fiabilité améliorée - Google Patents
Capteur de densité pour surveiller un taux de fuite d'une enveloppe d'appareillage électrique avec une fiabilité améliorée Download PDFInfo
- Publication number
- EP0911845B1 EP0911845B1 EP98402638A EP98402638A EP0911845B1 EP 0911845 B1 EP0911845 B1 EP 0911845B1 EP 98402638 A EP98402638 A EP 98402638A EP 98402638 A EP98402638 A EP 98402638A EP 0911845 B1 EP0911845 B1 EP 0911845B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- density
- density sensor
- temperature
- sensor
- envelope
- 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.)
- Expired - Lifetime
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Classifications
-
- 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 density sensor for monitoring a leakage rate from an enclosure of electrical equipment filled with a dielectric gas under pressure, comprising a mounting foot mounted from the outside in the thickness of the envelope and communicating with dielectric gas.
- An example of application of such a sensor is constituted by a generator or network circuit breaker mounted in an enclosure shielded, or a post in a metal envelope, the envelope containing sulfur hexafluoride SF6 under a pressure of a few bars.
- the density sensor is fixed to the envelope by outside and allows monitoring of the dielectric gas leak rate outside the envelope by comparison of density readings carried out throughout the operating life of the circuit breaker. of the even minimal leaks are inevitable, density tends after several years of operation, towards a threshold value below which the operation of the circuit breaker or switchgear is not safer. It is then necessary to inject gas dielectric to raise the density value to a value nominal, for example equal to 3.5 bars. Crossing the threshold usually triggers an alarm to cause a intervention on the circuit breaker to inject gas dielectric.
- DE-A-4 218 926 describes such a density sensor.
- the density sensor includes a pressure sensor and a temperature sensor arranged inside the mounting foot for communicate with the dielectric gas, and a measuring head for calculate the density of the gas for any pair of pressure values P and temperature T acquired at the same time.
- Plot 21 in Figure 1 reports an experiment conducted at using a sensor of the type which has just been described.
- the envelope armored vehicle is installed on an outdoor operating site, which corresponds to an important part of the operating sites of such electrical equipment.
- the envelope extends in one direction longitudinal which in the experience is oriented in a direction East to West of the operating site.
- the density sensor is attached to one end of the envelope so that it is not exposed to solar radiation only in the afternoons.
- Plot 21 of density calculated for each reading of pressure and temperature values acquired at the same time shows two distinct behaviors of the sensor.
- a first behavior is characterized by an evolution plate 21A of the density around the nominal value equal to 3.5 bars and corresponds to readings of pressure and temperature couples performed during the day and in the absence of significant solar radiation.
- a second behavior which corresponds to readings taken from day and in the presence of notable solar radiation, is characterized by a daily variation 21B of the density during which the density is first higher than the nominal value then lower, the transition point between positive and negative variations corresponding substantially to the zenith of the sun.
- the real density of SF 6 in the envelope remains constant and equal to its nominal value, as evidenced by the flat evolution reproduced for each day of readings carried out in the absence of significant solar radiation.
- the daily variation in density in the presence of significant sunshine actually represents a measurement artifact. Such an artifact does not prevent the envelope leakage rate from being monitored, since it is easy to retain only the readings taken in the absence of notable solar radiation for the calculation of the density.
- a problem arises when the amplitude of the daily variation of the calculated value of the density during notable days of sunshine is below the density threshold, referenced 20 in FIG. 1. This is notably the case when the density of the gas contained in the envelope has approached the threshold after several years of operation, due to the inevitable minimal leaks. Crossing the threshold then triggers an alarm generated by a negative variation in the density calculated by the density sensor during significant days of sunshine, which is considered untimely insofar as the density threshold will not actually be reached before several weeks, or several months.
- the object of the invention is a density sensor to monitor a leakage rate from an enclosure of electrical equipment that has improved reliability with respect to crossing a threshold of density.
- the idea behind the invention is to seek to transform the density sensor measurement artifact in variations of density at values always equal to or greater than the nominal value, to prevent any risk of inadvertent crossing of the threshold density.
- the invention relates to a density sensor for monitor a leakage rate from an electrical enclosure filled with a dielectric gas under pressure, comprising a foot fixing mounted from the outside in the thickness of the envelope and communicating with the dielectric gas, characterized in that a radiator is placed around the fixing foot of the density sensor.
- the radiator changes the thermal balance temperature sensor and dielectric gas so that it transforms negative then positive variations in density calculated during notable days of sunshine, in variations only positive. As a result, any risk of inadvertent crossing of a density threshold due to an artifact of measurement generated by readings made in the presence of a notable sunshine is eliminated.
- the invention relates to a density sensor for monitoring a leakage rate of an enclosure of electrical equipment filled with a dielectric gas under pressure, which comprises a fixing foot mounted from the outside in the thickness of the enclosure. and communicating with the dielectric gas.
- a density sensor 5 and a casing 3 of electrical equipment are shown in FIG. 2.
- the electrical equipment is for example a network circuit breaker or a generator circuit breaker, or a station in a metal casing, and is arranged in the envelope 3 into which the dielectric gas 7, for example SF 6 , is injected under a pressure of approximately 3.5 bars.
- the casing 3 has a central body 3C of cylindrical shape and is closed by two opposite covers 3A and 3B screwed to the central body 3C.
- a cylindrical fixing foot 5B surmounted by a measuring head 5A and terminated at the other end by a threaded tube 5C to be screwed into a conduit 9 formed in the thickness of the casing 3 and to communicate with the dielectric gas.
- the density sensor is mounted on the outside on the enclosure and tightened by means of a 5D bolt.
- a pressure detector and a temperature detector are housed in the fixing foot 5A and open out of the threaded tube 5C by a protective tube 5E and communicate with the dielectric gas 7 contained in the duct 9 of the casing 3.
- the two pressure and temperature detectors are connected to the measurement head 5A of the density sensor to which they deliver a signal representative respectively of the detected pressure P and of the detected temperature T.
- An electronic circuit integrated in the measurement head 5A makes it possible to determining a density value, for each pair of pressure and temperature values detected simultaneously, using an equation of state for the dielectric gas.
- Each value of the density is transmitted to a monitoring unit, which compares it to a low threshold value and to a high threshold value, and which triggers an alarm in the event that one of the thresholds is crossed by a value of density.
- a radiator is arranged around the foot of fixing the density sensor.
- a radiator 11 which is composed of two parts 11A and 11B having each four identical 11C fins to increase the surface heat exchange between the radiator and the surrounding air. Both parts 11A and 11B have a hollow half-cylinder 11D for be mounted flat around the fixing foot 5B cylindrical to using two cap screws 13 and 15 passing through the two parts 11A and 11B through holes 13A, 13B, and 15A, 15B.
- the radiator 11 is mounted around the fixing foot 5B while being in contact with the 5D clamping screw to influence heat exchanges occurring between the temperature detector and the dielectric gas contained in the conduit 9.
- Figure 1 shows a plot 23 of density values calculated by the density sensor according to the invention, from each pair of pressure values and simultaneously detected. We also show the plot 21 described previously.
- 23A we see in 23A that the radiator does not change the behavior of the density sensor for readings of values carried out in the absence of solar radiation notable. This first result therefore allows the density sensor according to the invention of being used to monitor an envelope leakage rate retaining only the daytime readings and in the absence of notable solar radiation.
- the second behavior of the density sensor is modified for readings taken in the presence of significant sunshine, in the sense where the density values provided by the sensor according to the invention are always equal to or greater than the actual density value, with a 23B variation increasing in the morning and a variation decreasing in the afternoon.
- the density sensor calculates, by compensating the pressure measured by the measured temperature, a density value smaller than the actual density. Similarly, if the measured temperature is lower than the actual gas temperature dielectric, the density sensor calculates by compensation in temperature, a higher density value than the actual density.
- the envelope and the foot have only a negligible influence on the thermal balance dielectric gas and temperature sensor, so that the measured temperature is close enough to the temperature actual dielectric gas for the density sensor to calculate a density value substantially faithful to the actual value.
- the radiator arranged around of the fixing foot and near the envelope does not have any effect thermal alone. This is what is observed on the plots 21A and 23A for readings taken during the day and in the absence notable sunshine.
- the mounting foot and casing disturb the thermal balance between the temperature detector and dielectric gas in a way different depending on the day period considered.
- the density sensor provides a density value that is less than the value of the actual density, as observed on plot 21B.
- the temperature rise of the mounting foot and of the detector is slowed down by the evacuation into ambient air, heat supplied by the envelope itself exposed to radiation solar. Heating of the mounting base and the detector is slowed down by the radiator so that the temperature of the latter does not become not higher than the actual temperature of the dielectric gas during the afternoon.
- the density provided under these conditions remains equal to higher than the actual density, as observed on line 23B.
- the density sensor is provided with a protective cover at the solar radiation.
- a cover 17 constituted by example of a reflective metallic material is fixed on the part 11A of radiator 11, via screws 13 and 15, to reflect solar radiation hitting the collector and part of the solar radiation hitting the envelope near duct 9 in which he climbed.
- the screws 13 and 15 are preferably made of a material which is not very heat conductive, for example Nylon, to thermally insulate the radiator cover.
- the cover reinforces the effect of radiator, insofar as the density values calculated from of readings taken in the presence of significant sunshine are greater than those that the density sensor provides in the absence of the cover. Therefore, it is planned to optimize the number of fins of the radiator to obtain a behavior of the density sensor in presence of the cover, substantially equivalent to a behavior in the absence of the cover.
Description
Claims (3)
- Un capteur de densité (5) pour surveiller un taux de fuite d'une enveloppe (3) d'appareillage électrique remplie d'un gaz diélectrique (7) sous pression, comprenant un pied de fixation (5B) monté par l'extérieur dans l'épaisseur de l'enveloppe et communiquant avec le gaz diélectrique, caractérisé en ce qu'un radiateur (11) est disposé autour du pied de fixation (5A) du capteur de densité.
- Le capteur de densité selon la revendication 1, dans lequel un capot (17) est disposé au dessus du radiateur.
- Le capteur de densité selon la revendication 2, dans lequel le capot est fixé au radiateur par des vis (13, 15) constituées d'un matériau peu conducteur de la chaleur.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9713300A FR2770295B1 (fr) | 1997-10-23 | 1997-10-23 | Capteur de densite pour surveiller un taux de fuite d'une enveloppe d'appareillage electrique avec une fiabilite amelioree |
FR9713300 | 1997-10-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0911845A1 EP0911845A1 (fr) | 1999-04-28 |
EP0911845B1 true EP0911845B1 (fr) | 2004-08-18 |
Family
ID=9512565
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98402638A Expired - Lifetime EP0911845B1 (fr) | 1997-10-23 | 1998-10-23 | Capteur de densité pour surveiller un taux de fuite d'une enveloppe d'appareillage électrique avec une fiabilité améliorée |
Country Status (8)
Country | Link |
---|---|
US (1) | US6125692A (fr) |
EP (1) | EP0911845B1 (fr) |
CN (1) | CN1174230C (fr) |
AT (1) | ATE274233T1 (fr) |
CA (1) | CA2250338A1 (fr) |
DE (1) | DE69825699T2 (fr) |
FR (1) | FR2770295B1 (fr) |
ID (1) | ID21141A (fr) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2787571B1 (fr) * | 1998-12-18 | 2001-01-12 | Alstom | Methode de mesure de la densite d'un gaz dielectrique dans une ligne blindee enterree |
DE10119637A1 (de) * | 2001-04-20 | 2002-11-21 | Rittal Gmbh & Co Kg | Schaltschrank-Überwachungssystem |
US7669428B2 (en) * | 2005-04-14 | 2010-03-02 | Georgia Tech Research Corporation | Vortex tube refrigeration systems and methods |
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 (fr) * | 2010-04-30 | 2011-11-03 | Maschinenfabrik Reinhausen Gmbh | Procédé de surveillance de gaz isolants |
CN101876619B (zh) * | 2010-06-23 | 2012-07-04 | 中国科学院遥感应用研究所 | 粮食密度测量方法及装置 |
DE102010055249B4 (de) * | 2010-12-10 | 2014-04-03 | Trafag Ag | Dichtewächter |
WO2012119082A1 (fr) | 2011-03-02 | 2012-09-07 | Franklin Fueling Systems, Inc. | Système de surveillance de densité de gaz |
US9212966B2 (en) * | 2011-08-05 | 2015-12-15 | Solon Manufacturing Company | Network manageable advanced gas sensor apparatus and method |
IN2014DN07676A (fr) | 2012-02-20 | 2015-05-15 | Franklin Fueling Systems Inc | |
DE102013020388A1 (de) * | 2012-12-13 | 2014-06-18 | Tesat-Spacecom Gmbh & Co. Kg | Verfahren zur Dichteprüfung eines Gehäuses |
DE102013115009B4 (de) | 2013-12-31 | 2020-02-06 | Trafag Ag | Dichtewächter mit getrennten Gehäuseteilen und Montage-Verfahren |
DE102013115007B4 (de) | 2013-12-31 | 2016-07-14 | Trafag Ag | Dichtewächter mit Getriebeelement und Verfahren zur Überwachung einer Gasdichte |
CN104215409B (zh) * | 2014-09-10 | 2017-03-08 | 国家电网公司 | 一种监测变压器套管密封状况的方法 |
DE102016123588A1 (de) | 2016-07-20 | 2018-01-25 | Trafag Ag | Ventilvorrichtung für Schaltanlagen oder dergleichen sowie Verwendungen derselben |
US20220165522A1 (en) * | 2020-11-20 | 2022-05-26 | Technologies Mindcore Inc. | Gas circuit breaker system and method thereof |
CN114587137B (zh) * | 2020-12-07 | 2023-07-04 | 佛山市顺德区美的电热电器制造有限公司 | 除味设备、烹饪设备、烹饪设备的控制方法和存储介质 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3077527A (en) * | 1961-06-21 | 1963-02-12 | S & C Electric Co | Circuit interrupter |
US3934454A (en) * | 1974-12-04 | 1976-01-27 | Allis-Chalmers Corporation | Gas conditioner and analyzer |
DE2607158A1 (de) * | 1976-02-21 | 1977-08-25 | Licentia Gmbh | Dichteueberwachungseinrichtung |
DE2714384C3 (de) * | 1977-03-29 | 1981-11-26 | SIEMENS AG AAAAA, 1000 Berlin und 8000 München | Überwachungseinrichtung für den Druck eines Gases |
US4206630A (en) * | 1979-03-12 | 1980-06-10 | Econics Corporation | Sample chamber for gas analyzer |
US4872345A (en) * | 1988-03-30 | 1989-10-10 | Shell Oil Company | Measuring wall erosion |
JPH0667113B2 (ja) * | 1990-01-26 | 1994-08-24 | 日新電機株式会社 | ガス絶縁式電気設備のガス漏れ監視装置 |
DE4218926A1 (de) * | 1992-06-10 | 1993-12-16 | Asea Brown Boveri | Vorrichtung zur Messung einer Gasdichte |
US5388451A (en) * | 1993-07-30 | 1995-02-14 | Consolidated Electronics Inc. | High voltage transmission switching apparatus with gas monitoring device |
JPH07129870A (ja) * | 1993-10-28 | 1995-05-19 | Toshiba Corp | ガス絶縁開閉装置のガス漏れ検出装置 |
US5502435A (en) * | 1994-04-06 | 1996-03-26 | Ralston; Douglas E. | Method and system for monitoring circuit breaker gas pressure |
EP0726630B1 (fr) * | 1995-02-08 | 1999-10-27 | Gec Alsthom T Et D Sa | Procédé et dispositif de détermination de la masse volumique d'un gaz d'isolement d'un appareil électrique |
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 |
-
1997
- 1997-10-23 FR FR9713300A patent/FR2770295B1/fr not_active Expired - Fee Related
-
1998
- 1998-10-22 CA CA002250338A patent/CA2250338A1/fr not_active Abandoned
- 1998-10-22 US US09/176,958 patent/US6125692A/en not_active Expired - Fee Related
- 1998-10-23 CN CNB981245617A patent/CN1174230C/zh not_active Expired - Fee Related
- 1998-10-23 EP EP98402638A patent/EP0911845B1/fr not_active Expired - Lifetime
- 1998-10-23 DE DE69825699T patent/DE69825699T2/de not_active Expired - Fee Related
- 1998-10-23 AT AT98402638T patent/ATE274233T1/de not_active IP Right Cessation
- 1998-10-23 ID IDP981400A patent/ID21141A/id unknown
Also Published As
Publication number | Publication date |
---|---|
DE69825699T2 (de) | 2005-08-18 |
FR2770295B1 (fr) | 1999-11-26 |
ATE274233T1 (de) | 2004-09-15 |
FR2770295A1 (fr) | 1999-04-30 |
DE69825699D1 (de) | 2004-09-23 |
CN1224155A (zh) | 1999-07-28 |
CA2250338A1 (fr) | 1999-04-23 |
US6125692A (en) | 2000-10-03 |
EP0911845A1 (fr) | 1999-04-28 |
ID21141A (id) | 1999-04-29 |
CN1174230C (zh) | 2004-11-03 |
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