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(11) | EP 0 130 276 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
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| (54) |
Static induction device Statische Induktionsanordnung Dispositif statique à induction |
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| Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
[0001] This invention relates to a static induction device, and more particularly to improvements in a piping structure located between a cooler unit and the main body of a static induction device comprising the cooler unit.
[0002] There is known a static induction device comprising a cooler unit located above a top cover for the same and including an inlet and an outlet, an upper piping for connecting the inlet of the cooler unit to a hole disposed on either one of the top covers adjacent to one edge and one of a plurality lateral plates for the static induction device connected to the one edge of the top cover on the upper portion, a lower piping for connecting the outlet of the cooler unit to a hole on the lower portion of the lateral plate opposite to the first-mentioned lateral plate, the upper and lower pipings forming a passageway for an electrically insulating, cooling medium for cooling the static induction device, and a plurality of reinforcing members disposed on the lateral plates.
[0003] In the accompanying drawings:
Figure 1 is a plan view of the known static induction device;
Figure 2 is a front elevational view of the arrangement shown in Figure 1 ; and
Figure 3 is a side elevational view of the arrangement shown in Figures 1 and 2.
[0004] The static induction device shown in those Figures comprises a transformer (not shown) disposed within a housing in the form of rectangular box including a top cover 10, two pairs of opposite lateral plates 12 and a bottom plate 14. In order that the housing withstands an excessive pressure developed upon the occurrence of a fault on the transformer and a vacuum resistance test, the lateral plates 12 are generally reinforced by a plurality of reinforcing rectangular rods 16 disposed thereon to extend perpendicularly to both the top cover 10 and the bottom plate 14. In the example illustrated, a single one of the reinforcing rectangular rods 16 is centrally disposed on each of the two opposite shorter lateral plates 12 and the three reinforcing rectangular rods 16 are disposed in parallel, spaced relationship on each of the two opposite longer lateral plates 12. Furthermore the housing is fully charged with an electrical insulating cooling medium, for example an electrically insulating oil so that the transformer is immersed into the oil.
[0005] The arrangement comprises further a cooler unit, in this case, six coolers 18 arranged in three rows and two columns as viewed in Figure 1 above the top cover 10.
[0006] As shown best in Figure 3, an upper piping 20 in the form of an L has one leg extending from the top cover 10 of the housing adjacent to one edge, in this case, the righthand edge as viewed in Figure 3 to be perpendicular to the top cover 10 and the other leg extending in parallel to the top cover 10 above the coolers 18 to be connected to inlets, in this case, the upper ends of the coolers 18 through individual branches. Also a lower, generally L-shaped piping 22 is disposed between outlets or the lower ends of the coolers 18 and the lower portion of that longer lateral plate 12 remote from the upper piping 20. More specifically, the lower piping 22 has one leg of the "U" extending in parallel, spaced relationship with the last-mentioned lateral plate 12 and including an end portion bent toward the lower portion of that plate and connected thereto between the central reinforcing rod 16 and the righthand reinforcing rod 16 as viewed in Figure 2 to be substantially aligned with the lower ends thereof. On the other hand, the other leg of the "U" extends in parallel to the top cover 10 between the latter and the coolers 18 and connected on the end portion to outlets or the lower ends of the coolers 18 through individual branches.
[0007] Thus the upper piping 20 connects the inlets of the coolers 1 to the interior of the housing 10-12-14 through a mating hole disposed on the top cover 10 and the lower piping 22 connects the outlets of the coolers 18 to the interior of the housing through a mating hole disposed on the lower portion of the longer lateral wall 12 remote from the upper piping 20 resulting in the formation of a passageway for the electrically insulating cooling medium or the oil
[0008] If desired, the upper piping 20 may be connected to a hole disposed on the upper portion of the longer lateral plate 12 connected to the one edge of the top cover 10 between the adjacent reinforcing rectangular rods.
[0009] In operation, the transformer is heated to decrease a specific gravity of the oil. The oil decreased in specific gravity is raised toward the upper portion of the housing until it passes through the upper piping 20 to reach the inlets of the coolers 18. During the passage thereof throughthe coolers 20, the e 0 is cooled through heat exchange between the same and the surrounding air to increase in specific gravity. The oil increased in specific gravity passes through the lower piping 22 to reach the lower portion of the housing. The process as described above is repeated to continuously cool the transformer.
[0010] In conventional static induction devices comprising the cooler unit located above the same such as described above, the lower piping 22 has been required to extend along the adjacent lateral plate and the top cover of the housing separately from the reinforcing rectangular rods 4. In addition, the lower piping, in many cases, has been located outside of the adjacent reinforcing rods.
[0011] This has meant that the resulting static induction device increases correspondingly in outside dimension.
[0012] Accordingly it is an object of the present invention to provide a new and improved static induction device decreased in outside dimension and therefore saved in amounts of materials used.
[0013] In order to attain the object thereof, the present invention is characterized in that at least one of the reinforcing rods is formed into a passageway for the electrically insulating cooling medium to be also used as a part of the lower piping.
[0014] Preferably, the reinforcing rod forming the passageway has a U-shaped cross section and in- cludestwo legs of the "U" connected at both ends to the lateral plate remote from the upper piping, one end closed and opening in a mating hole disposed on the lower portion of the last-mentioned lateral plate and the other end open and connected to the lower piping.
[0015] The present invention will now be further described by way of example with reference to Figures 4, 5 and 6 of the accompanying drawings in which:
Figure 4 is a fragmental side elevational view of one embodiment according to the static induction device of the present invention;
Figure 5 is a sectional view of the arrangement shown in Figure 4 with part omitted;
Figure 6 is a cross sectional view taken along the line VI-VI of Figure 4; and
Figure 7 is a view similar to Figure 5 but illustrating a modification of the present invention.
[0016] Throughout those Figures like reference numerals designate the components identical or corresponding to those shown in figures 1, 2 and 3.
[0017] The arrangement illustrated in Figures 4, and 6 is different from that shown in Figures 1, 2 and 3 only in that in Figures 4, 5 and 6 one of the reinforcing rectangular rods 16a disposed on the longer lateral plate 12 remote from the upper piping 20 (not shown) has a rectangular U-shaped cross section and includes two legs of the "U" connected at both ends to that lateral plate 12 and one end, in this case, the lower end as viewed in Figure 5 closed but connected to the interior of the housing formed of the top cover 10, the lateral plates and the bottom plate through a hole 24 (see Figure 5) disposed on the adjacent part of the lower portion of the lateral plate 12. Thus the reinforcing rectangular rod 16a forms a passageway leading to the interior of the housing. The reinforcing rod 14a includes the other or upper ends open and connected to the lower piping 22 as shown in Figures 4 and 5.
[0018] Figure 7 shows a modification of the present invention in which one of the reinforcing rectangular rods 16b has a hollow rectangular cross section and is substituted for the reinforcing rectangular rod 16a as described above.
[0020] From the foregoing it is seen that, by forming an oil path of the reinforcing rod 16a or 1 6b having the rectangular U-shaped or the hollow rectangular cross section respectively, the reinforcing rod 16a or 16b can serve as both an oil piping and a reinforcing member for the housing. In other words, the oil as having passed through the lower piping 22 flows into the interior of the reinforcing rod 16a or 16b connected thereto and then enters the interior of the housing through the lower portion of thereof resulting in the formation of the passageway for the electrically insulating cooling medium.
1. A static induction device comprising cooler unit (18) located above a top cover
(10) for the same and including an inletand an outlet, an upper piping (20) for connecting
the inlet of the cooler unit (18) to a hole disposed on either one of the top covers
(10) adjacent to one edge and one of a plurality of lateral plates (12) for the static
induction device connected to the one edge of the top cover (10) on the upper portion,
a lower piping (22) for connecting the outlet of the cooler unit (18) to a hole on
the lower portion of the lateral plate (12) opposite to the first-mentioned lateral
plate (12), the upper piping (20) and the lower piping (22) forming a passageway for
an electrically insulating cooling medium for cooling the static induction device,
and a plurality of reinforcing rods (16) disposed on the lateral plates (12), characterized
in that at least one (16a or 16b) of the reinforcing rods (16) is formed into a passageway
for the electrically insulating cooling medium to be also used as a part of the lower
piping (22).
2. A static induction device according to claim 1, characterized in that the at least
one (16a) of the reinforcing rods (16) has a U-shaped cross section and includes two
legs of the "U" connected at both ends to the lateral plate (12) remote from the upper
piping (20), one end closed and opening in the mating hole (24) disposed on the lower
portion of the last-mentioned lateral plate (12) and the other end open and connected
to the lower piping (22).
3. A static induction device according to claim 1, characterized in that the at least
one (16b) of the reinforcing rods (16) has a hollow rectangular cross section and
includes one side connected to the lateral plate (12) remote from the upper piping
(20), one end closed and opening in the mating hole (24) disposed on the lower portion
of the last-mentioned lateral plate (12) and the other end open and connected to the
tower piping (22).
1. Eine statische induktionsanofdnung mit einer Kühleinheit (18), die über einem oberen
Dekkel (10) für die Anordnung liegt und einen Zufluss und einen Abfluss enthält, einer
oberen Röhre (20) zur Verbindung des Zuflusses der Kühleinheit (18) mit einem Loch,
das entweder auf dem oberen Deckel (10) benachbart zu einer Kante angeordnet ist oder
auf einer einer Vielzahl von Seitenplatten (12) für die statische Induktionsanordnung,
die mit der einen Kante des oberen Deckels (10) am oberen Teil verbunden sind, einer
unteren Röhre (22) zum Verbinden des Abflusses der Kühleinheit (18) mit einem Loch
am unteren Teil der Seitenplatte (12) gegenüber der zuerst erwähnten Seitenplatte
(12), wobei die obere Röhre (20) und die untere Röhre (22) einen Durchgang für ein
elektrisch isolierendes Kühlmedium zum Kühlen der statischen Induktionsanordnung bilden,
und einer Vielzahl von Verstärkungsstäben (16), die auf den Seitenplatten (12) angeordnet
sind, dadurch gekennzeichnet, dass mindestens einer (16a oder 16b) der Verstärkungsstäbe
(16) als Durchgang für das elektisch isolierende Kühlmedium ausgebildet ist, um auch
als Teil der unteren Röhre (22) verwendet zu werden.
2. Eine statische Induktionsanordnung nach Anspruch 1, dadurch gekennzeichnet, dass
mindestens einer (16a) der Verstärkungsstäbe (16) einen U-förmigen Querschnitt aufweist
und zwei Arme des .,U" mit beiden Enden mit der Seitenplatte (12) verbunden sind,
die entfernt von der oberen Röhre (20) liegt, wobei ein Endegeschlossen ist und sich
in ein entsprechendes Loch (24) öffnet, das im unteren Teil der zuletzt erwähnten
Seitenplatte (12) angeordnet ist, und das andere Ende offen ist und mit der unteren
Röhre (22) verbunden ist.
3. Eine statische Induktionsanordnung nach Anspruch 1, dadurch gekennzeichnet, dass
zumindest einer (16b) der Verstärkungsstäbe (16) einen hohlen rechtwinkligen Querschnitt
aufweist und eine Seite enthält, die mit der entfernt von der oberen Röhre (20) liegenden
Seitenplatte (12); verbunden ist, wobei ein Ende geschlossen ist und sich in ein entsprechendes Loch
(24) öffnet, das im unteren Teil der zuletzt erwähnten Seitenplatte (12) angeordnet
ist, und das andere Ende offen ist und mit der unteren Röhre (22) in Verbindung steht.
1. Dispositif d'induction statique comportant une unité de refroidissement (18) placée
au-dessus d'un couvercle (10) du dispositif et comportant une entrée et une sortie,
un tuyau (20) supérieur pour connecter l'entrée de l'unité de refroidissement (18)
à un trou disposé des deux côtés du couvercle (10) près d'un bord et d'une plaque
latérale parmi plusieurs plaques pour le dispositif d'induction statique raccordé
au bord du couvercle (10) sur la partie supérieure, un tuyau inférieur (22) pour connecter
la sortie de l'unité de refroidissement (18) à un trou disposé dans la partie inférieure
de la plaque latérale (12) opposée à la plaque latérale (12) mentionnée en premier,
le tuyau supérieur (20) et le tuyau inférieur (22) formant un passage pour un moyen
de refroidissement à isolation électrique pour le refroidissement du dispositif d'induction
statique, et une pluralité de barres de renforcement (16) disposées sur les plaques
latérales (12), caractérisé en ce qu'au moins une barre (1 6a ou 16b) des barres de
renforcement (16) est formée comme passage pour l'isolation électrique du moyen de
refroidissement, afin de pouvoir être également utilisée comme partie du tuyau inférieur
(22).
2. Dispositif d'induction statique selon la revendication 1, caractérisé en ce qu'au
moins une (16a) des barres de renforcement (16) a une section transversale en forme
de U et comporte deux branches de «U» raccordées aux deux extrémités à la plaque latérale
(12) éloignée du tuyau supérieur
(20), une extrémité étant fermée et ouvrant dans le trou correspondant (24) disposé
sur la partie inférieure de la plaque latérale mentionnée en dernier et l'autre extrémité
étant ouverte et raccordée au tuyau inférieur (22).
3. Dispositif d'induction statique selon la revendication 1, caractérisé en ce qu'au
moins une -(16b) des barres de renforcement (16) a une coupe transversale rectangulaire
creuse et comporte un côté raccordé à la plaque latérale (12) éloignée du tuyau supérieur
(20), une extrémité étant fermée et s'ouvrant dans le trou correspondant (24) disposé
sur la partie inférieure de la plaque latérale (12) mentionnée en dernier et l'autre
extrémité étant ouverte et raccordée au tuyau inférieur (22).