Electrical housing having cooling and sound-absorbing means

1. An apparatus for enclosing at least one medium and/or high voltage unit connectable to an electric power system, each unit comprising one or a plurality of electrical components and generating heat as a by-product during operation, wherein the apparatus comprises:

a housing which comprises:

a main chamber housing a seat for holding the unit, the main chamber being arranged to house the unit;

at least one gas exit opening at an upper part of the housing and at least one gas entry opening;

a sound-absorptive gas exit chamber provided with the at least one gas exit opening; and

a sound-absorptive gas entry chamber provided with the at least one gas entry opening,

wherein a first heat convection path is provided inside the housing between the at least one gas entry opening and the at least one gas exit opening, via the gas entry chamber, via the main chamber and via the gas exit chamber, in order to provide cooling,

wherein each of the gas exit chamber and the gas entry chamber houses at least one sound-absorbing member made at least partially of a sound-absorbing material for absorbing sound produced by the unit during operation,

wherein at least one of the gas exit chamber and the gas entry chamber has at least one heat conducting wall and at least one free space provided between the at least one sound-absorbing member and said heat conducting wall such that the first heat convection path is provided inside the housing between the at least one gas entry opening and the at least one gas exit opening via the at least one free space, and

wherein the heat conducting wall heats the gas or gas mixture flowing in and passing through the at least one free space.

2. The apparatus according to claim 1 , wherein the at least one gas exit opening is located at a height above the unit when the unit is placed in the seat.

3. The apparatus according to claim 1 , wherein the at least one heat conducting wall comprises a heat conducting first wall situated between the gas exit chamber and the main chamber, the first wall being a wall of the main chamber and of the gas exit chamber, and wherein the at least one free space is provided in the gas exit chamber between the at least one sound-absorbing member and the first wall such that the first heat convection path is provided inside the housing between the at least one gas entry opening and the at least one gas exit opening via the at least one free space.

4. The apparatus according to claim 3 , wherein the first wall is an upper wall at an upper part of the housing.

5. The apparatus according to claim 1 , wherein the at least one heat conducting wall comprises a heat conducting second wall situated between the gas entry chamber and the main chamber, the second wall being a wall of the main chamber and of the gas entry chamber, and wherein the at least one free space is provided in the gas entry chamber between the at least one sound-absorbing member and the second wall such that the first heat convection path is provided inside the housing between the at least one gas entry opening and the at least one gas exit opening via the at least one free space.

6. The apparatus according to claim 3 , wherein the first wall and/or the second wall have/has a first surface facing the unit, and wherein the emissivity of the first surface is between 0.7 and 1.

7. The apparatus according to claim 3 , wherein the first wall and/or the second wall have/has a second surface facing the sound-absorbing member, and wherein the emissivity of the second surface is between 0.7 and 1.

8. The apparatus according to claim 3 , wherein the first wall and/or the second wall have/has a substantially horizontal extension.

9. The apparatus according to claim 1 , wherein the at least one heat conducting wall comprises a heat conducting third wall situated at an upper part of the housing, the third wall being an exterior wall of the housing and of the gas exit chamber, and wherein the at least one free space is provided in the gas exit chamber between the at least one sound-absorbing member and the third wall such that the first heat convection path is provided inside the housing between the at least one gas entry opening and the at least one gas exit opening via the at least one free space.

10. The apparatus according to claim 1 , wherein the at least one heat conducting wall comprises a heat conducting third wall situated at an upper part of the housing, the third wall being an exterior wall of the housing and of the gas exit chamber, wherein at least one second free space is provided between the at least one sound-absorbing member and the third wall, and wherein a second heat convection path is provided inside the housing between the at least one gas entry opening and the at least one gas exit opening, via the gas entry chamber, via the main chamber, via the gas exit chamber and via the at least one second free space, in order to provide cooling.

11. The apparatus according to claim 9 , wherein the third wall has a substantially horizontal extension.

12. The apparatus according to claim 9 , wherein the third wall is arched or has a pyramid or dome shape, and wherein the at least one gas exit opening is located in an upper region of the arch, pyramid or dome formed by the third wall.

13. The apparatus according to claim 1 , wherein the at least one gas entry opening is located at a lower part of the housing, e.g. at a height below the at least one gas exit opening.

14. An electric power arrangement comprising:

at least one medium and/or high voltage unit connectable to an electric power system, each unit comprising one or a plurality of electrical components and generating heat as a by-product during operation; and

at least one apparatus as claimed in claim 1 .

15. The electric power arrangement according to claim 14 , wherein each electrical component comprises a capacitor.

16. The apparatus according to claim 3 , wherein the first wall and/or the second wall have/has a first surface facing the unit, and wherein the emissivity of the first surface is between 0.9 and 1.

17. An apparatus according to claim 3 , wherein the first wall and/or the second wall have/has a second surface facing the sound-absorbing member, and in that the emissivity of the second surface is between 0.9 and 1.

18. The apparatus according to claim 1 , wherein the at least one gas entry opening is located at a lower part of the housing at a height below the at least one gas exit opening.

19. An apparatus according to claim 2 , wherein the at least one heat conducting wall comprises a heat conducting first wall situated between the gas exit chamber and the main chamber, the first wall being a wall of the main chamber and of the gas exit chamber, and wherein the at least one free space is provided in the gas exit chamber between the at least one sound-absorbing member and the first wall such that the first heat convection path is provided inside the housing between the at least one gas entry opening and the at least one gas exit opening via the at least one free space.

20. An apparatus according to claim 2 , wherein the at least one heat conducting wall comprises a heat conducting second wall situated between the gas entry chamber and the main chamber, the second wall being a wall of the main chamber and of the gas entry chamber, and wherein the at least one free space is provided in the gas entry chamber between the at least one sound-absorbing member and the second wall such that the first heat convection path is provided inside the housing between the at least one gas entry opening and the at least one gas exit opening via the at least one free space.