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1. (WO2019064230) TANK FOR TRANSFORMER AND TRANSFORMER THEREOF
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C L A I M S

1. Tank for electrical transformer comprising a bottom plate (10), two side panels (2) and two end panels (1) joined to contain an insulating fluid, and reinforcements joined to the exterior of said panels,

wherein the two side panels (2) and the two end panels (1) are vertically curving convex panels,

wherein the reinforcements comprise a plurality of arched vertical reinforcements (3, 4, 5) distributed horizontally along each panel.

2. Tank according to the previous claim wherein the reinforcements comprise a plurality of bracing horizontal reinforcements (6, 7, 8) joined between said vertical reinforcements (3, 4, 5).

3. Tank according to the previous claim wherein the bracing horizontal reinforcements (6, 7, 8) are joined to the exterior of side panels (2) and end panels (1).

4. Tank according to any of the previous claims wherein the inner profile of the vertical reinforcements (3, 4, 5) is an arching profile matching the outer curving convex profile of the panels (1, 2).

5. Tank according to any of the previous claims wherein the outer profile of the vertical reinforcements (3, 4, 5) is an arching profile.

6. Tank according to any of the previous claims wherein the horizontal reinforcements include corner horizontal reinforcements (8) bracing two vertical reinforcements each from a respective end and side panel.

7. Tank according to any of the previous claims wherein the horizontal reinforcements (6, 7, 8) are planar.

8. Tank according to any of the previous claims wherein the horizontal reinforcements (6, 7, 8) are located at:

a horizontal plane in the vertical middle of the respective panel, or

parallel horizontal planes distributed vertically along the respective panel.

9. Tank according to any of the previous claims wherein the vertical reinforcements (3, 4, 5) extend substantially to the full height of the respective panel.

10. Tank according to any of the previous claims wherein the panels have a curvature which has a centre at the vertical middle of the respective panel (1, 2), in particular the curvature being circular, parabolic or a catenary.

11. Tank according to any of the previous claims wherein the panels (1, 2) and reinforcements (3, 4, 5, 6, 7, 8) are formed from sheet metal.

12. Tank according to any of the previous claims wherein the reinforcements (3, 4, 5, 6, 7, 8) are joined to the exterior of said panels (1, 2) by welding.

13. Electrical transformer comprising an electromagnetic circuit (12, 13) and a tank according to any of the previous claims.

14. Electrical transformer according to the previous claim further comprising a convex cover (15) secured to a top border (9) of the tank.

15. Electrical transformer according to any of the claims 16-19 wherein the transformer is a core transformer or shell transformer.