EP0883222B1 - Déclencheur d'auto-protection pour transformateur électrique immergé - Google Patents
Déclencheur d'auto-protection pour transformateur électrique immergé Download PDFInfo
- Publication number
- EP0883222B1 EP0883222B1 EP19980109270 EP98109270A EP0883222B1 EP 0883222 B1 EP0883222 B1 EP 0883222B1 EP 19980109270 EP19980109270 EP 19980109270 EP 98109270 A EP98109270 A EP 98109270A EP 0883222 B1 EP0883222 B1 EP 0883222B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- container
- tank
- trip
- lever
- actuator
- 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
Links
Images
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
- H01H33/55—Oil reservoirs or tanks; Lowering means therefor
- H01H33/555—Protective arrangements responsive to abnormal fluid pressure, liquid level or liquid displacement, e.g. Buchholz relays
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/404—Protective devices specially adapted for fluid filled transformers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/18—Switches operated by change of liquid level or of liquid density, e.g. float switch
Definitions
- a submerged transformer is a transformer whose windings electrical and magnetic circuits are cooled by immersion in a liquid dielectric, such as mineral oil, contained in a hermetic tank. It says “self-protected” when it includes on-board equipment allowing, without energy outside, automatically disconnect its primary windings from the network power supply in case of internal damage likely to lead to bursting of the tank. Examples of such damage include a sharp rise in dielectric fluid pressure, or an abnormal decrease in its level following a leak out of the tank.
- Such self-protection equipment usually consists of a disconnector solicited by an actuator, itself activated by a trigger consisting of a device detection device sensitive to variations of a magnitude of the dielectric liquid capable of expressing the appearance of possible risk anomalies within the tank, such as temperature, pressure or the level of the surface of the dielectric liquid in the tank.
- Document GB 710 004 which is considered to be the closest state of the art, discloses a detector composed of a open container at its top (so as to allow its automatic filling in dielectric fluid) located at the end of the lever arm and associated, by means of a pivot, with a counterweight. When the level of dielectric liquid drops, the container emerges gradually to become heavier than the counterweight. It then tilts slowly until you switch on a switch.
- the subject of the invention is a trigger for a device Embedded self-protection of an electric transformer immersed in a filled tank of dielectric liquid cooling by disconnection of the primary supply network electric in the event of abnormal drop in the level of the dielectric liquid, comprising a disconnect solicited by an actuator, itself being activated by said trigger, which is characterized in that it is constituted, on the one hand, by a lever of first species turning around a pivot dividing it into a short arm representing the "Resistance" and in a long arm representing the "Power" of the lever, the end of the arm container having a free inlet opening, and, on the other hand, by means allowing the automatic filling of said container with the liquid dielectric by passage through said opening during filling of the tank; of the means being provided at the end of the short arm to exert a force on the actuator, said disconnection occurring when said force exceeds a resistance threshold determined by the actuator, the relative dimensions of the lever arms and those of the container being such that, as long as the actuator
- the idea underlying the invention lies in the design a lever-type trigger that is sensitive to fluid level changes dielectric in the tank, not as a level follower, but as a volume weighing at the end of the longest lever arm (so-called “advantageous” lever) and subject to the thrust of Archimedes from this liquid.
- This volume originally empty, is then occupied by dielectric liquid from the tank itself in order to be able to carry out this filling automatically, when filling the tank, in a container planned open for this purpose at the end of the lever arm.
- a determining advantage of the trigger according to the invention lies in the fact that simply meets the seemingly contradictory constraints of Lever floats intended to be installed in a confined area where they are to occupy the less space (here the very crowded part under the cover of a transformer). Indeed, or one uses a heavy float in order to be able to shorten the lever arm that carries it, but in this case the float becomes bulky because necessarily large to float. Or we use a little float bulky, but in this case it must be mounted on a lever arm which then becomes itself bulky, because necessarily lengthened to keep the moment of the lever.
- the assembly formed by the triggering lever 6, the actuator 2 and the disconnector 5 constitutes the onboard self-protection device to which the invention refers.
- the object of the invention its characteristics dimensions and the positions of its constituent elements are determined according to criteria already expressed, which will be explained again later.
- All the constituent parts of the self-protection device are made of dense materials (metal or plastic) that may not be altered by their contact with the dielectric liquid for the intended duration of use for the transformer.
- the triggering lever 6 with its end container 10 are additionally chosen in a material less dense than the dielectric liquid in order to take naturally a stable position "high" in normal operation of the transformer visible in Figure 3.
- the device also comprises a stop 12, the function of which will be explained more far.
- the tank 1 of the transformer is seen when the dielectric liquid 13 is at its nominal volume within the tank, which will be assumed to be "full filling” or In this case, its surface 16 is, in any case, at a final level such as the container 10 be completely submerged.
- the top edge of the container 10 comes into contact with the abutment 12 beforehand, which prevents the container from mounting more and therefore causes, through the upper inlet opening 20, the filling automatic from the latter by dielectric liquid as soon as the level of the surface 16 reaches the edge of the container.
- the container 10 Once the container 10 is completely filled, its position completely immersed in the same liquid that it contains drives the pusher 11 to stay preferably slightly behind the actuator 2, and in any case to exercise on it a force lower than the trigger threshold "Fd".
- the position of the pivot 7, the relative dimensions of the lever arms 6 (defining its transformation ratio) and the capacity of the container 10 are calculated so that the intensity the force "F" may become substantially greater than the trigger threshold "Fd", and this threshold "Fd" is exceeded when the level of the surface 16 of the dielectric liquid has to such an extent that it results in a risk of explosion of the transformer.
- This level must of course, be predetermined during the design of the transformer.
- the pusher 11 exerts on the actuator 2 a "Fo" effort of 200g empty, that is to say when there is no oil neither in the container 10 nor in the tank in contact with this last.
- the trigger 6 will be set so that the disconnection of the transformer occurs only when the force exerted by the pusher 11 exceeds a threshold "Fd" trigger of 800 g.
- this device for detecting the level of liquid dielectric extremely simple in its design, construction and operation, is therefore of great reliability. Its performance is not likely to deteriorate in the time.
- Another advantage over a conventional float device is that before or after during the filling of the transformer, a float device causes the triggering the disconnection device. This one must be rearmed after the filling, provided, however, that such a possibility has been retained for construction, unless there are means for locking the float in the up position during the filling, which further complicates the construction of the trigger device.
- the abutment 12 may very well be constituted by the bottom of the lid 3 himself.
- one or more notches formed on the edge of the container 10, preferably on the inside of the lever, may advantageously constitute passages of entry of the dielectric liquid 13 into the container when the latter has come into abutment against the lid 3.
- openings made through the wall of the container at neighborhood of the upper edge could also fulfill such a function.
- the automatic filling of the container 10 can be realized otherwise than from above. It is quite possible indeed to arrange an opening in its bottom through which will enter the dielectric liquid when filling the tank, this orifice However, it is equipped with a non-return valve resting on the bottom to prevent further put the inside of the container in communication with the surrounding liquid medium.
- these means allowing the automatic filling of said container through the dielectric liquid through its inlet opening during filling the tank must be designed to prevent the exit of this liquid from container by the same way.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
Description
- la figure 1 représente schématiquement, vue en coupe, la cuve d'un transformateur immergé et le dispositif selon l'invention, avant le remplissage de la cuve par du liquide diélectrique de refroidissement;
- la figure 2 représente la même cuve et le même dispositif pendant le remplissage de la cuve;
- la figure 3 représente la même cuve et le même dispositif, mais au terme du remplissage de la cuve;
- la figure 4 représente la même cuve et le même dispositif après l'apparition d'une fuite de liquide diélectrique ayant provoqué une baisse dangereuse du niveau dudit fluide dans la cuve.
- un levier de première espèce 6;
- un pivot horizontal 7, placé de telle manière qu'il divise ce levier 6 en deux bras de longueurs respectives "d" pour le plus court 8 constituant la "Résistance", et "D" pour le bras le plus long 9 constituant la "Puissance" du levier;
- un récipient 10 à l'extrémité du bras long 9, comportant une ouverture 20 de libre entrée, et dont le poids contribue, via le rapport de transformation D/d du levier, à l'établissement d'une force "F" dirigée vers le haut à l'extrémité du bras court 8. Ici, l'ouverture 20 est obtenue à la partie supérieure du récipient simplement par absence de cloison supérieure;
- un poussoir 11 à l'extrémité du bras court 8 et chargé d'appliquer en fonctionnement l'effort "F" à un actionneur 2 qui lui résiste en opposant une résistance "Fd" correspondant au seuil de déclenchement choisi pour solliciter l'organe de déconnexion 5 du réseau d'alimentation électrique des enroulements du primaire du transformateur.
Claims (6)
- Déclencheur d'un appareil embarqué d'auto-protection d'un transformateur électrique (19) immergé dans une cuve (1) remplie de liquide diélectrique refroidissant par déconnexion du primaire du réseau d'alimentation électrique en cas de baisse anormale du niveau du liquide diélectrique, dispositif comprenant un déconnecteur (5) sollicité par un actionneur (2), lui-même activé par ledit déclencheur comprenant un récipient (10) présentant une ouverture d'entrée (20), lequel déclencheur est constitué, d'une part, par un levier (6) de première espèce tournant autour d'un pivot (7) qui le divise en un bras court (8) représentant la "Résistance" et en un bras long (9) représentant la "Puissance" du levier, l'extrémité du bras long étant munie dudit récipient (10) et, d'autre part, par des moyens permettant le remplissage automatique dudit récipient par le liquide diélectrique au travers de ladite ouverture (20) lors du remplissage de la cuve; lequel déclencheur se caractérise par le fait que des moyens étant prévus à l'extrémité du bras court (8) pour exercer un effort sur l'actionneur (2), ladite déconnexion se produisant lorsque ledit effort surpasse un seuil de déclenchement prédéterminé opposé par l'actionneur, les dimensions relatives des bras (8, 9) de levier et celles du récipient (10) étant telles que, tant que la cuve est remplie de liquide diélectrique (13), le récipient est complètement immergé dans ce liquide et l'effort exercé sur l'actionneur est inférieur audit seuil prédéterminé, et si la surface (16) dudit liquide descend vers un niveau considéré comme dangereusement bas, ledit récipient, qui reste rempli par du liquide (13), atteint un degré d'émergence tel que, sous l'effet son poids, l'effort exercé sur l'actionneur surpasse ledit seuil prédéterminé de déclenchement.
- Déclencheur selon la revendication 1 caractérisé en ce que le récipient (10) à l'extrémité du bras long (9) de levier est ouvert à sa partie supérieure (20).
- Déclencheur selon les revendication 1 et 2, caractérisé en ce que les moyens permettant le remplissage automatique du récipient (10) par du liquide diélectrique passant au travers de ladite ouverture (20) lors du remplissage de la cuve sont constitués par une butée d'arrêt (12) coopérant avec le bord dudit récipient.
- Déclencheur selon les revendication 1 et 2, caractérisé en ce que les moyens permettant le remplissage automatique du récipient (10) par du liquide diélectrique passant au travers de ladite ouverture (20) lors du remplissage de la cuve sont constitués par des encoches ménagées sur le bord dudit récipient.
- Déclencheur selon la revendication 1, caractérisé en ce que le récipient (10) est pourvu d'une ouverture d'entrée ménagée dans son fond et en ce que les moyens permettant le remplissage automatique dudit récipient par du liquide diélectrique passant au travers de ladite ouverture sont constitués par un clapet anti-retour coopérant avec cette dernière.
- Transformateur électrique immergé de puissance ou de distribution de l'énergie électrique du type comportant un équipement embarqué d'auto-protection (6,2,5) par déconnexion du réseau électrique en cas de baisse du niveau (16) du liquide diélectrique (13) dans la cuve (2) qui le contient, ledit équipement incluant un déclencheur sensible aux variations dudit niveau, caractérisé en ce que ledit déclencheur (6) est conforme à celui de la revendication 1.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9706938 | 1997-06-03 | ||
FR9706938A FR2764130B1 (fr) | 1997-06-03 | 1997-06-03 | Declencheur d'auto-protection pour transformateur electrique immerge |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0883222A1 EP0883222A1 (fr) | 1998-12-09 |
EP0883222B1 true EP0883222B1 (fr) | 2005-02-02 |
Family
ID=9507620
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19980109270 Expired - Lifetime EP0883222B1 (fr) | 1997-06-03 | 1998-05-22 | Déclencheur d'auto-protection pour transformateur électrique immergé |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0883222B1 (fr) |
CN (1) | CN1126133C (fr) |
DE (1) | DE69828842T2 (fr) |
ES (1) | ES2236846T3 (fr) |
FR (1) | FR2764130B1 (fr) |
RU (1) | RU2213406C2 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10361884B3 (de) * | 2003-12-19 | 2005-08-11 | Siemens Ag | Vorrichtung und Verfahren zur Überwachung eines Gasvolumens in einer mit Flüssigkeit befüllten Anlage |
CN109506327B (zh) * | 2018-10-24 | 2021-10-08 | 朱笑笑 | 一种基于会议桌面的状态可自行关闭的会议室用空调 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH246813A (de) * | 1945-01-11 | 1947-01-31 | Fries Eduard | Schutzeinrichtung an Isolierflüssigkeit enthaltendem elektrischem Apparat, insbesondere für kleinere Leistungen und hohe Spannungen. |
GB710004A (en) * | 1951-08-31 | 1954-06-02 | English Electric Co Ltd | Improvements in and relating to oil actuated protective relays for transformers and other oil-filled electrical apparatus |
-
1997
- 1997-06-03 FR FR9706938A patent/FR2764130B1/fr not_active Expired - Fee Related
-
1998
- 1998-05-22 DE DE1998628842 patent/DE69828842T2/de not_active Expired - Lifetime
- 1998-05-22 ES ES98109270T patent/ES2236846T3/es not_active Expired - Lifetime
- 1998-05-22 EP EP19980109270 patent/EP0883222B1/fr not_active Expired - Lifetime
- 1998-06-02 RU RU98110359A patent/RU2213406C2/ru not_active IP Right Cessation
- 1998-06-03 CN CN 98109643 patent/CN1126133C/zh not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
FR2764130B1 (fr) | 1999-07-09 |
CN1126133C (zh) | 2003-10-29 |
CN1201246A (zh) | 1998-12-09 |
RU2213406C2 (ru) | 2003-09-27 |
EP0883222A1 (fr) | 1998-12-09 |
DE69828842T2 (de) | 2006-05-04 |
FR2764130A1 (fr) | 1998-12-04 |
ES2236846T3 (es) | 2005-07-16 |
DE69828842D1 (de) | 2005-03-10 |
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