FR2588996A2 - Reduction in a dielectric volume by using glass bubbles - Google Patents
Reduction in a dielectric volume by using glass bubbles Download PDFInfo
- Publication number
- FR2588996A2 FR2588996A2 FR8515792A FR8515792A FR2588996A2 FR 2588996 A2 FR2588996 A2 FR 2588996A2 FR 8515792 A FR8515792 A FR 8515792A FR 8515792 A FR8515792 A FR 8515792A FR 2588996 A2 FR2588996 A2 FR 2588996A2
- Authority
- FR
- France
- Prior art keywords
- bubbles
- dielectric
- transformer tank
- density
- tube
- 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.)
- Pending
Links
Classifications
-
- 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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/327—Encapsulating or impregnating
-
- 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
- H01F27/02—Casings
- H01F27/025—Constructional details relating to cooling
-
- 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
- H01F27/12—Oil cooling
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
Description
Le brevet principal décrit un moyen de réduire le volume occupé dans la cuve par le diélectrique liquide (généralement de l'huile) et d'un prix compétitif.The main patent describes a means of reducing the volume occupied in the tank by the liquid dielectric (generally oil) and at a competitive price.
Dans le cas de transformateurs remplis (pour des raisons de sécurité, ininflammabilite) de diélectriques chimiques tels que des chlores, biodegradables ou silicones, il est possible d'utiliser d'autres moyens plus onéreux mais totalement ininflammables tout en restant largement moins chers que le diélectrique utilisé.In the case of transformers filled (for safety reasons, non-flammability) with chemical dielectrics such as chlorine, biodegradable or silicone, it is possible to use other more expensive but totally non-flammable means while remaining largely cheaper than dielectric used.
ce moyen est constitué par des bulles de verre, ou billes creuses. (1) Leur dimension est calculée pour offrir une trés bonne résistance mécanique aux chocs, pour ne pas opposer une résistance à la circulation du diélectrique, et enfin pour ne pas pouvoir se glisser dans les canaux de refroidissement. Leur diamètre sera compris entre un et trois centimetres.(Fig.l) ces bulles seront fabriquees à partir d'un tube de verre et seront obtenues par une operation de roulage qui- leur donnera la forme choisie, sphérique ou ovoide3ar exemple. En faisant varier l'épaisseur de la paroi (4) du tube, on peut faire varier proportionnellement la densité de ces bulles de façon à déterminer à l'avance la place qu'elles occuperont dans la cuve.Cette particularite est très importante car elle permet de réduire les volumes importants occupes par le diélectrique dans trois zones principales qui sont le fond de la cuve, les côtés de la cuve la hauteur des bobinages et la partie superieure de la cuve au dessus des bobinages(7) occupée uniquement par les bornes haute tension et basse tension ainsi que par les commutateurs. C'est là que se trouve le principal volume de diélectrique.Les variations de densité seront très faible, de l'ordre de quelques pour cent, de façon à ce que ces bulles de verre puissent être ani mées d'un certain mouvement relatif par rapport à la convection du diélectrique et qu'elles facilitent cette convection et participent aux échanges thermiques internes. (Fig.2) (8) L'interieur du tube de verre pourra être rempli d'un gaz lui-même diélectrique tel que du SF6 ou un autre gaz, de façon à augmenter encore le pouvoir diélectrique de ces bulles.D'autre part, l'ionisation de ce volume gazeux est sans influence sur la qualité du verre et donc sur son pouvoir isolant. (2)
Ces bulles peuvent être agglomérées pour former des volumes de forme déterminez (par exemple dans les coins de la cuve)(ls oit par fusion superficielle, soit par revêtement avec une pellicule plastiqu83)obtenue par des moyens connus. (Fig.3)
Pour un transformateur donne, il est donc possible de déterminer à l'avance le volume de bulles que l'on désire trouver au fond, au centre ou en haut de la cuve, la repartition se faisant automatiquement au moment du remplissage.this means consists of glass bubbles, or hollow beads. (1) Their size is calculated to offer very good mechanical resistance to shocks, not to oppose resistance to the circulation of the dielectric, and finally so as not to be able to slip into the cooling channels. Their diameter will be between one and three centimeters. (Fig.l) these bubbles will be made from a glass tube and will be obtained by a rolling operation which will give them the chosen shape, spherical or ovoid for example. By varying the thickness of the wall (4) of the tube, the density of these bubbles can be varied proportionally so as to determine in advance the place they will occupy in the tank. This particularity is very important because it reduces the large volumes occupied by the dielectric in three main areas which are the bottom of the tank, the sides of the tank the height of the windings and the upper part of the tank above the windings (7) occupied only by the terminals high voltage and low voltage as well as by switches. This is where the main volume of dielectric is located. The variations in density will be very small, on the order of a few percent, so that these glass bubbles can be animated by a certain relative movement by compared to the convection of the dielectric and that they facilitate this convection and participate in internal heat exchanges. (Fig. 2) (8) The interior of the glass tube can be filled with a gas which is itself dielectric such as SF6 or another gas, so as to further increase the dielectric power of these bubbles. apart, the ionization of this gas volume has no influence on the quality of the glass and therefore on its insulating power. (2)
These bubbles can be agglomerated to form volumes of determined shape (for example in the corners of the tank) (ls it by surface fusion, or by coating with a plastic film) obtained by known means. (Fig. 3)
For a given transformer, it is therefore possible to determine in advance the volume of bubbles that one wishes to find at the bottom, center or top of the tank, the distribution being done automatically at the time of filling.
De telles bulles, mais plus petites,(11) peuvent être utilisées pour réduire le vo lume de résine coulée autour des bobinages dans les transformateurs enrobes, ces bulles ayant une densité egale à celle de la résine utilisée pour eviter leur sedimentation au bas des enrobages. (Fig.4) Such bubbles, but smaller, (11) can be used to reduce the volume of resin poured around the windings in the coated transformers, these bubbles having a density equal to that of the resin used to avoid their sedimentation at the bottom of the coatings. . (Fig. 4)
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8515792A FR2588996A2 (en) | 1984-10-29 | 1985-10-18 | Reduction in a dielectric volume by using glass bubbles |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8417040A FR2575816B1 (en) | 1984-10-29 | 1984-10-29 | TRANSFORMER TANK COOLING BY RADIAL AND CONCENTRIC RADIATORS AND WITH REDUCED CAPACITY |
FR8515792A FR2588996A2 (en) | 1984-10-29 | 1985-10-18 | Reduction in a dielectric volume by using glass bubbles |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2588996A2 true FR2588996A2 (en) | 1987-04-24 |
Family
ID=26224234
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8515792A Pending FR2588996A2 (en) | 1984-10-29 | 1985-10-18 | Reduction in a dielectric volume by using glass bubbles |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2588996A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2278688A1 (en) * | 2009-07-24 | 2011-01-26 | General Electric Company | Insulating compositions and devices incorporating the same |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR737656A (en) * | 1931-05-27 | 1932-12-15 | Siemens Ag | Cooling container for oil-cooled devices |
FR797940A (en) * | 1934-11-22 | 1936-05-06 | Thomson Houston Comp Francaise | Liquid dielectric economizer device |
US2990528A (en) * | 1960-02-25 | 1961-06-27 | Mc Graw Edison Co | Lightweight distribution transformer |
FR1273843A (en) * | 1960-11-18 | 1961-10-13 | Thomson Houston Comp Francaise | Method for insulating conductors |
FR1457535A (en) * | 1965-09-07 | 1966-01-24 | Thomson Houston Comp Francaise | Improvements to impregnation and molding processes for electrical parts |
FR2034885A7 (en) * | 1969-03-13 | 1970-12-18 | Licentia Gmbh | |
US3979552A (en) * | 1974-03-11 | 1976-09-07 | Kuhlman Corporation | Coolant displacement material |
JPS5637610A (en) * | 1979-09-05 | 1981-04-11 | Toshiba Corp | Electromagnetic coil |
-
1985
- 1985-10-18 FR FR8515792A patent/FR2588996A2/en active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR737656A (en) * | 1931-05-27 | 1932-12-15 | Siemens Ag | Cooling container for oil-cooled devices |
FR797940A (en) * | 1934-11-22 | 1936-05-06 | Thomson Houston Comp Francaise | Liquid dielectric economizer device |
US2990528A (en) * | 1960-02-25 | 1961-06-27 | Mc Graw Edison Co | Lightweight distribution transformer |
FR1273843A (en) * | 1960-11-18 | 1961-10-13 | Thomson Houston Comp Francaise | Method for insulating conductors |
FR1457535A (en) * | 1965-09-07 | 1966-01-24 | Thomson Houston Comp Francaise | Improvements to impregnation and molding processes for electrical parts |
FR2034885A7 (en) * | 1969-03-13 | 1970-12-18 | Licentia Gmbh | |
US3979552A (en) * | 1974-03-11 | 1976-09-07 | Kuhlman Corporation | Coolant displacement material |
JPS5637610A (en) * | 1979-09-05 | 1981-04-11 | Toshiba Corp | Electromagnetic coil |
Non-Patent Citations (1)
Title |
---|
PATENTS ABSTRACTS OF JAPAN, vol. 5, no. 91(E-61)[763], 13 juin 1981; & JP-A-56 037 610 (TOKYO SHIBAURA DENKI K.K.) 11-04-1981 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2278688A1 (en) * | 2009-07-24 | 2011-01-26 | General Electric Company | Insulating compositions and devices incorporating the same |
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