FR2481013A1 - Leakage monitor for HV metal clad switchgear - has two concentric gaskets in series and elastic seal in smooth bore - Google Patents

Leakage monitor for HV metal clad switchgear - has two concentric gaskets in series and elastic seal in smooth bore Download PDF

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Publication number
FR2481013A1
FR2481013A1 FR8008591A FR8008591A FR2481013A1 FR 2481013 A1 FR2481013 A1 FR 2481013A1 FR 8008591 A FR8008591 A FR 8008591A FR 8008591 A FR8008591 A FR 8008591A FR 2481013 A1 FR2481013 A1 FR 2481013A1
Authority
FR
France
Prior art keywords
insulator
screw
flanges
series
seal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR8008591A
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French (fr)
Other versions
FR2481013B1 (en
Inventor
Henri Organi
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.)
Alsthom Atlantique SA
Original Assignee
Alsthom Atlantique SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alsthom Atlantique SA filed Critical Alsthom Atlantique SA
Priority to FR8008591A priority Critical patent/FR2481013A1/en
Priority to US06/251,441 priority patent/US4420970A/en
Priority to EP81102752A priority patent/EP0038492B1/en
Priority to DE8181102752T priority patent/DE3166408D1/en
Priority to BR8102279A priority patent/BR8102279A/en
Priority to ES501355A priority patent/ES8203169A1/en
Priority to CA000375595A priority patent/CA1167124A/en
Publication of FR2481013A1 publication Critical patent/FR2481013A1/en
Application granted granted Critical
Publication of FR2481013B1 publication Critical patent/FR2481013B1/fr
Priority to SG805/86A priority patent/SG80586G/en
Granted legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/16—Flanged joints characterised by the sealing means
    • F16L23/167—Flanged joints characterised by the sealing means in connection with the appearance or detection of leaks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2853—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipe joints or seals
    • G01M3/2869—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipe joints or seals for seals not incorporated in a pipe joint
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G5/00—Installations of bus-bars
    • H02G5/06—Totally-enclosed installations, e.g. in metal casings
    • H02G5/066—Devices for maintaining distance between conductor and enclosure
    • H02G5/068—Devices for maintaining distance between conductor and enclosure being part of the junction between two enclosures

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Gas-Insulated Switchgears (AREA)

Abstract

Leakage of compressed gas (e.g. SF6) past a toroidal gasket seated in a groove on the face of a flange results in flow through a narrow bore connecting the space between successive gaskets with a smooth radial bore. The conventional screw and gasket fitted into this radial bore are replaced by a wedge plug comprising a screw, an underlying washer, a tubular elastic (e.g. rubber) seal and a nut. The screw is threaded at its end only, the part nearest to the head being left smooth to ensure a gastight contact within the tubular seal, which surrounds it and is gripped between the washer and nut. To check for leakage, the screw is withdrawn and a whistling noise betrays any presence of compressed gas within the bore. Machining of the device is simplified and its cost reduced.

Description

Dispositif de contrôle de fuite pour poste blindé à haute tension
L'invention est relative à un dispositif de contrôle de fuite pour poste électrique blindé à haute tension sous pression de gaz diélectrique.Leak control device for high voltage shielded substation
The invention relates to a leakage control device for a high-voltage shielded substation under dielectric gas pressure.

Les postes électriques blindés à isolation par un gaz sous pression tel que l'hexafluorure de soufre, doivent présenter une très bonne étanchéité pendant des mois, voire des années sans remplissage complémentaire de gaz. Il est connu d'utiliser deux joints placés en série sur le trajet de fuite, ce qui réduit considérablement les risques de fuite. De plus, il est aussi connu de contrôler la bonne étanchéité du joint placé le plus à l'intérieur par mesure des fuites dans le volume situé entre les deux joints. Ceci est obtenu en munissant la bride d'un trou qui débouche d'une part, à l'extérieur, et d'autre part, dans la zone située entre les deux joints, l'orifice tourné vers l'extérieur est normalement fermé de manière étanche par un boulon serrant un joint. Shielded electrical substations insulated by a pressurized gas such as sulfur hexafluoride, must have a very good seal for months or even years without additional gas filling. It is known to use two seals placed in series on the leak path, which considerably reduces the risk of leaks. In addition, it is also known to check the proper sealing of the innermost seal by measuring leaks in the volume located between the two seals. This is obtained by providing the flange with a hole which opens on the one hand, on the outside, and on the other hand, in the area between the two seals, the orifice facing outward is normally closed. tightly by a bolt tightening a joint.

L'invention a pour but un dispositif de contrôle de fuite entre éléments de poste blindé sous pression de gaz ne nécessitant qu'un usinage simplifié et par suite d'un coût intéressant. The object of the invention is to provide a device for controlling leakage between elements of a shielded station under gas pressure requiring only a simplified machining and therefore an attractive cost.

L'invention a pour objet un dispositif de contrôle de fuite entre des brides d'assemblage de viroles d'un poste électrique sous enveloppe métallique remplie de gaz comprimé, à l'aide de deux joints disposés concentriquement en série sur les faces d'assemblage des viroles, caractérisé en ce que le volume interne compris entre les deux joints est obturé par un joint élastique disposé dans un trou lisse ménagé à travers l'une des viroles. The subject of the invention is a device for controlling leakage between flanges for assembling the ferrules of an electrical substation in a metal casing filled with compressed gas, using two seals arranged concentrically in series on the assembly faces. ferrules, characterized in that the internal volume between the two seals is closed by an elastic seal disposed in a smooth hole formed through one of the ferrules.

Selon un premier mode de réalisation le trou lisse est ménagé à travers la périphérie de l'une des brides. According to a first embodiment, the smooth hole is formed through the periphery of one of the flanges.

Dans une variante de réalisation, un isolateur étant interposé entre les brides d'assemblage des viroles, le trou lisse est ménagé au travers de la périphérie de 1'isolateur et fait communiquer avec l'extérieur les volumes. internes compris entre les joints des faces d'assemblage des brides avec l'isolateur. Le trou lisse de l'isolateur peut être obtenu par la présence d'un noyau de moulage lors de la coulée de l'isolateur et les joints d'étanchéité des faces d'assemblage sont disposés dans des gorges ménagées dans l'isolateur. In an alternative embodiment, an isolator being interposed between the assembly flanges of the ferrules, the smooth hole is formed through the periphery of the isolator and makes the volumes communicate with the outside. internals between the joints of the flange assembly faces with the insulator. The smooth hole of the insulator can be obtained by the presence of a molding core during the casting of the insulator and the seals of the assembly faces are arranged in grooves made in the insulator.

Les caractéristiques et avantages de l'invention ressortiront de la description de modes de réalisation illustrés dans les dessins
La figure 1 est une vue schématique partielle et en coupe d'un assemblage de brides comportant un dispositif de contrôle suivant l'art antérieur.The characteristics and advantages of the invention will emerge from the description of embodiments illustrated in the drawings
Figure 1 is a partial schematic view in section of an assembly of flanges comprising a control device according to the prior art.

La figure 2 est une vue schématique partielle et en coupe d'un assemblage de brides comportant un dispositif de contrôle suivant l'invention. Figure 2 is a partial schematic view in section of an assembly of flanges comprising a control device according to the invention.

La figure 3 est une vue schématique partielle et en coupe d'un assemblage de brides comportant une variante de réalisation du dispositif de contrôle suivant l'invention. Figure 3 is a partial schematic view in section of an assembly of flanges comprising an alternative embodiment of the control device according to the invention.

L'assemblage représenté dans la figure 1 comporte des viroles 1 et 3 présentant chacune une bride de fixation 2 et 4. Un isolateur 5 en forme de disque ou de cône est interposé entre les deux brides 2 et 4 qui sont assemblées par des boulons non représentés traversant des perçages de leur périphérie. L'isolateur 5 constitue lui-même une virole intermédiaire entre les brides des viroles 1 et 3. L'étanchéité des brides 2 et 4 est assurée, par deux joints toriques 6, 7 et 8, 9 placés concentriquement en série entre l'intérieur et l'extérieur des viroles et logés dans des gorges 26,27 et 28, 29 ménagées dans les faces d'assemblage des brides 2 et 4. Les deux gorges telles que 26 et 27 d'une même bride communiquent entre elles créant ainsi entre les joints interne 6 et externe 7 un volume tel que 10. The assembly shown in Figure 1 has ferrules 1 and 3 each having a mounting flange 2 and 4. An insulator 5 in the form of a disc or cone is interposed between the two flanges 2 and 4 which are assembled by bolts not represented crossing holes of their periphery. The insulator 5 itself constitutes an intermediate ferrule between the flanges of the ferrules 1 and 3. The sealing of the flanges 2 and 4 is ensured by two O-rings 6, 7 and 8, 9 placed concentrically in series between the interior and the outside of the ferrules and housed in grooves 26, 27 and 28, 29 formed in the assembly faces of the flanges 2 and 4. The two grooves such as 26 and 27 of the same flange communicate with each other thus creating between the internal joints 6 and external 7 a volume such as 10.

Pour contrôler une fuite éventuelle du joint 6 qui entrainerait la montée en pression du volume 10, on utilise un trou radial 11 de la bride 2 dans lequel débouche un trou 30 de reprise de fuite sensiblement perpendiculaire mettant le volume 10 en communication avec l'extérieur. En service normal, le trou 11 est fermé de façon étanche par un joint 13 placé sous la tête d'une vis 12 vissée dans un taraudage du trou 11. To control a possible leak in the seal 6 which would cause the pressure in volume 10 to rise, a radial hole 11 is used in the flange 2 into which a substantially perpendicular leak recovery hole 30 opens, putting the volume 10 in communication with the outside. . In normal service, the hole 11 is closed in a leaktight manner by a seal 13 placed under the head of a screw 12 screwed into a thread of the hole 11.

Pour effectuer un contrôle d'étanchéité on dévisse la vis 12. To carry out a tightness check, unscrew screw 12.

Un sifflement indique alors une fuite de gaz depuis le volume 10, donc au niveau du joint 6 ; on répéte l'opération en dévissant l'autre vis.A hissing sound then indicates a gas leak from the volume 10, therefore at the joint 6; the operation is repeated by unscrewing the other screw.

Dans la figure 2, correspondant au dispositif selon l'invention, on a remplacé la vis 12 et le joint 13 de la figure 1 par un bouchon à cheville 15, ne nécessitant pas de taraudage du trou 11. Le bouchon 15 est constitué d'une vis 16, d'une rondelle 17 d'étanchéité, d'un joint tubulaire 18 d'étanchéité et d'un écrou 19. La vis 16 qui a une tête quelconque, présente une partie filetée seulement sur son extrémité, tandis que la partie près de la tête est lisse pour assurer une étanchéité avec le joint tubulaire 18 au travers duquel elle est enfilée. Le joint tubulaire 18, qui a un diamètre extérieur légèrement inférieur au diamètre du trou 11, est serré entre d'une part la rondelle 17 et d'autre part l'écrou 19. In FIG. 2, corresponding to the device according to the invention, the screw 12 and the gasket 13 in FIG. 1 have been replaced by a plug 15, not requiring tapping of the hole 11. The plug 15 consists of a screw 16, a sealing washer 17, a tubular seal 18 and a nut 19. The screw 16 which has any head has a threaded portion only on its end, while the part near the head is smooth to ensure a seal with the tubular seal 18 through which it is threaded. The tubular joint 18, which has an outside diameter slightly smaller than the diameter of the hole 11, is clamped between on the one hand the washer 17 and on the other hand the nut 19.

Pour obturer le trou 11, donc le volume 10 situé entre les deux joints 6 et 7, on introduit l'ensemble du bouchon 15, dans le trou 11, puis on serre la vis 16. Le joint en caoutchouc 18, qui est comprimé entre l'écrou 19 et la rondelle 17, assure l'étanchéité. To close the hole 11, therefore the volume 10 located between the two seals 6 and 7, the assembly of the plug 15 is introduced into the hole 11, then the screw 16 is tightened. The rubber seal 18, which is compressed between the nut 19 and the washer 17, provides sealing.

Pour effectuer un contrôle d'étanchéité on dévisse la vis 16. To carry out a tightness check, unscrew screw 16.

Un sifflement indique alors une fuite de gaz depuis le volume 10, donc au niveau du joint 6. Un tel dispositif, qui ne nécessite plus de taraudage dans une bride volumineuse, est beaucoup plus avantageux.A hissing sound then indicates a gas leak from the volume 10, therefore at the joint 6. Such a device, which no longer requires tapping in a bulky flange, is much more advantageous.

La variante de réalisation de la figure 3 tient compte de la présence habituelle d'un isolateur 5 interposé entre les brides. The variant embodiment of FIG. 3 takes account of the usual presence of an insulator 5 interposed between the flanges.

Les brides 13 ne comportent plus les gorges des figures 1 et 2. Par contre, du fait que l'isolateur 5 est en matériau synthétique moulé, des réserves sont ménagées pour obtenir directement de coulée les gorges 20, 21, 22, 23 et les volumes 10 et 10' par aménagement du moule. Un noyau métallique présentant une légère dépouille permet d'obtenir aussi directement de coulée un trou radial 24. il suffit ensuite de percer deux trous 25 et 25' de faible diamètre débouchant perpendiculairement dans le trou radial 24 pour mettre en communication les volumes 10 et 10' avec le trou 24. Un bouchon 15 analogue à celui décrit dans la figure 2 permet d'obturer le trou 24. The flanges 13 no longer have the grooves of FIGS. 1 and 2. On the other hand, since the insulator 5 is made of molded synthetic material, reserves are provided to directly obtain the grooves 20, 21, 22, 23 and the volumes 10 and 10 'by fitting out the mold. A metal core having a slight draft also allows a radial hole 24 to be obtained directly from casting. It is then sufficient to drill two holes 25 and 25 ′ of small diameter opening perpendicularly into the radial hole 24 to bring the volumes 10 and 10 into communication. 'with the hole 24. A plug 15 similar to that described in FIG. 2 makes it possible to close the hole 24.

Dans cette variante de réalisation, il n'y a plus d'usinage de trous radiaux dans les brides. Ils sont remplacés. par un trou radial unique et des gorges venues de coulée avec Isisolateur dont l'usinage est limité aux trous de reprises de fuite 25 et 25'. In this variant embodiment, there is no longer any machining of radial holes in the flanges. They are replaced. by a single radial hole and grooves coming from casting with insulator whose machining is limited to the leak recovery holes 25 and 25 '.

il est évident que l'invention n'est nullement limitée aux modes de réalisation qui viennent d'être décrits et représentés et qui n'ont été donnés-qu'à titre d'exemple ; en particulier, on peut, sans sortir du cadre de l'invention, modifier certaines dispositions ou remplacer certains moyens par des moyens équivalents, ou èncore remplacer certains éléments par d'autres susceptibles d'assurer la même fonction technique ou une fonction technique équivalente.  it is obvious that the invention is in no way limited to the embodiments which have just been described and represented and which have been given-only by way of example; in particular, it is possible, without departing from the scope of the invention, to modify certain provisions or to replace certain means by equivalent means, or even to replace certain elements by others capable of ensuring the same technical function or an equivalent technical function.

Claims (5)

REVENDICATIONS 1/ Dispositif de contrôle de fuite entre des brides d'assemblage de viroles d'un poste électrique sous enveloppe métallique remplie de gaz comprimé, à l'aide de deux joints disposés concentriquement en série sur les faces d'assemblage, des viroles, caractérisé en ce que le volume interne (10) compris entre les deux joints (6, 7) est obturé par un joint élastique (18) disposé dans un trou lisse (11, 24) ménagé à travers l'une des viroles (1, 3).1 / Device for controlling leakage between flanges for assembling the ferrules of an electrical substation in a metallic envelope filled with compressed gas, using two seals arranged concentrically in series on the assembly faces, ferrules, characterized in that the internal volume (10) between the two seals (6, 7) is closed by an elastic seal (18) disposed in a smooth hole (11, 24) formed through one of the ferrules (1, 3 ). 2/ Dispositif selon la revendication 1, caractérisé en ce que le trou lisse (11) est ménagé à travers la périphérie de l'une des brides (2).2 / Device according to claim 1, characterized in that the smooth hole (11) is formed through the periphery of one of the flanges (2). 3/ Dispositif selon la revendication 1, caractérisé en ce que, l'assemblage entre brides comportant un isolateur (5) interposé entre les brides (2, 4), le trou lisse (24) est ménagé au travers de la périphérie de l'isolateur et fait communiquer avec l'extérieur les volumes internes (10 et 10') compris entre les joints des faces d'assemblage des brides avec l'isolateur. 3 / Device according to claim 1, characterized in that, the assembly between flanges comprising an insulator (5) interposed between the flanges (2, 4), the smooth hole (24) is formed through the periphery of the insulator and communicates with the outside the internal volumes (10 and 10 ') between the joints of the flange assembly faces with the insulator. 4/ Dispositif selon la revendication 3, caractérisé en ce que le trou lisse (24) de l'isolateur (5) est obtenu par la présence d'un noyau de moulage lors de la coulée de l'isolateur.4 / Device according to claim 3, characterized in that the smooth hole (24) of the insulator (5) is obtained by the presence of a molding core during the casting of the insulator. 5/ Dispositif selon l'une des revendications 3 et 4, caractérisé en ce que les joints d'étanchéité (6, 7, 8, 9) des faces d'assemblage sont disposés dans des gorges (20, 21, 22, 23) ménagées dans l'iso- lateur (5). 5 / Device according to one of claims 3 and 4, characterized in that the seals (6, 7, 8, 9) of the assembly faces are arranged in grooves (20, 21, 22, 23) provided in the insulator (5).
FR8008591A 1980-04-17 1980-04-17 Leakage monitor for HV metal clad switchgear - has two concentric gaskets in series and elastic seal in smooth bore Granted FR2481013A1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
FR8008591A FR2481013A1 (en) 1980-04-17 1980-04-17 Leakage monitor for HV metal clad switchgear - has two concentric gaskets in series and elastic seal in smooth bore
US06/251,441 US4420970A (en) 1980-04-17 1981-04-06 Apparatus for checking for leaks from metal-clad high-tension electric gear
DE8181102752T DE3166408D1 (en) 1980-04-17 1981-04-10 Leak checking device for high-voltage metal-clad switchgear
EP81102752A EP0038492B1 (en) 1980-04-17 1981-04-10 Leak checking device for high-voltage metal-clad switchgear
BR8102279A BR8102279A (en) 1980-04-17 1981-04-14 EXHAUST CONTROL DEVICE BETWEEN HOSE CONNECTION FLANGES OF AN ELECTRICAL INSTALLATION UNDER COMPRESSED GAS FULL METAL WRAP
ES501355A ES8203169A1 (en) 1980-04-17 1981-04-14 Leak checking device for high-voltage metal-clad switchgear.
CA000375595A CA1167124A (en) 1980-04-17 1981-04-15 Device for controlling leaks in a high voltage shielded set
SG805/86A SG80586G (en) 1980-04-17 1986-10-03 Leak checking device for high-voltage metal-clad switchgear

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8008591A FR2481013A1 (en) 1980-04-17 1980-04-17 Leakage monitor for HV metal clad switchgear - has two concentric gaskets in series and elastic seal in smooth bore

Publications (2)

Publication Number Publication Date
FR2481013A1 true FR2481013A1 (en) 1981-10-23
FR2481013B1 FR2481013B1 (en) 1984-02-03

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FR8008591A Granted FR2481013A1 (en) 1980-04-17 1980-04-17 Leakage monitor for HV metal clad switchgear - has two concentric gaskets in series and elastic seal in smooth bore

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FR (1) FR2481013A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR752354A (en) * 1933-03-14 1933-09-21 Const Metalliques Et Mecanique Flanged joints for pipes or pressure vessels
FR992862A (en) * 1944-08-04 1951-10-24 Merlin Gerin Device for watertight fixing of insulators, such as those used in compressed gas electrical switches
FR1370643A (en) * 1963-05-28 1964-08-28 Lee Co Improvements to closing and sealing devices for openings

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR752354A (en) * 1933-03-14 1933-09-21 Const Metalliques Et Mecanique Flanged joints for pipes or pressure vessels
FR992862A (en) * 1944-08-04 1951-10-24 Merlin Gerin Device for watertight fixing of insulators, such as those used in compressed gas electrical switches
FR1370643A (en) * 1963-05-28 1964-08-28 Lee Co Improvements to closing and sealing devices for openings

Also Published As

Publication number Publication date
FR2481013B1 (en) 1984-02-03

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