We Claim:
We Claim:
1. A transformer arrangement (100) comprising
a transformer (10) comprising at least one phase winding (12), said phase winding (12) having coil turns around a coil axis (c), the transformer having a 5 first extension along a first axis (z) parallel with the coil axis (c), a second
extension along a second axis (x) and a third extension along a third axis (y), said first, second and third axes being perpendicular to each other, and the transformer (10) having lateral sides parallel with the coil axis (c), a transformer tank (20) having walls (22) forming an enclosure in which said 10 transformer (10) is arranged, said enclosure containing an incompressible
medium in which the transformer (10) is immersed, - a screen (30) arranged in said transformer tank (20), between the walls (22) of the transformer tank and the at least one phase winding (12) of the transformer (10), said screen (30) having an inner, transformer-facing, surface and an 15 outer, wall-facing, surface, the screen (30) being arranged distanced from the
at least one phase winding (12) of the transformer (10), and characterized in that the transformer has a first end along the first axis (z) and an opposite second end along the first axis (z), and in that the transformer tank (20) has a first wall (22') extending transversely to the first axis (z) adjacent to the first 20 end of the transformer (10) and an opposite second wall (22") extending
transversely to the first axis (z), adjacent to the second end of the transformer (10), wherein the screen (30) has at least one first part (32) and at least one second part (32"), each extending transversely to the first axis (z) and wherein the at least one first part (32') is arranged between the first end of the transformer (10) 25 and the first wall (22') of the transformer tank (22) and the at least one second part
(32") is arranged between the second end of the transformer (10) and the second wall (22") of the transformer tank (20), and wherein the screen (30) has at least one lateral part (32) aligned with the lateral sides of the transformer (10), and wherein the at least one lateral part (32) of the screen circumscribes the 30 transformer (30).
2. The transformer arrangement (100) according to claim 1, wherein the screen (30) is configured to be free from structural resonances at twice a network frequency.
3. The transformer arrangement (100) according to claim 1 or 2, wherein the inner surface of the screen (30) comprises a volumetrically compressible lining (34).
4. The transformer arrangement (100) according to claim 3, wherein the lining (34) 5 has a bulk modulus <1.7 GPa.
5. The transformer arrangement (100) according to claim 1, wherein the screen (30) comprises a granular material.
10 6. The transformer arrangement (100) according to claim 5, wherein the granular material has a density of more than 870 kg/m3, or more preferably a density of more than 1600 kg/m3.
7. The transformer arrangement (100) according to claim 5 or 6, wherein the screen 15 (30) is arranged on the walls (22) of said transformer tank (20).
8. The transformer arrangement (100) according to any one of the claims 1-6, wherein the screen (30) is arranged distanced from the walls (22) of the transformer tank (20).
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9. The transformer arrangement (100) according to claim 8, wherein, in any point of
the screen (30), a distance between said point of the screen (30) and a closest part of the at least one phase winding (12) of the transformer is less than a distance between said point of the screen (30) and a closest part of the walls (22) 25 of the transformer tank (20)