Cooling of a static electric induction system

1. A static electric induction system comprising:

a heat generating component;

cooling fluid;

a cooling duct along the heat generating component; and

a pumping system configured for driving the cooling fluid through the cooling duct;

wherein the pumping systems applies a varying flow rate over time of the cooling fluid in the cooling duct along a predetermined flow rate curve, which is a function of time and is not required to be dependent on real-time measurements;

wherein the flow rate cure oscillates between a predetermined maximum flow rate and a predetermined minimum flow rate.

2. The static electric induction system according to claim 1 , further including:

a cooling loop for circulating the cooling fluid within the static electric induction system.

3. The static electric induction system according to claim 2 , wherein the cooling loop includes a heat exchanger for cooling the cooling fluid.

4. The static electric induction system according to claim 2 , wherein the cooling loop includes a pressure chamber for distributing the cooling fluid to the cooling duct.

5. The static electric induction system according to claim 1 , wherein the cooling duct includes a plurality of flow paths connected in parallel with each other.

6. The static electric induction system according to claim 1 , wherein the cooling duct includes obstacles for the cooling fluid.

7. The static electric induction system according to claim 6 , wherein the obstacles are fins, baffles, and/or flow guides.

8. The static electric induction system according to claim 1 , wherein the oscillation is periodic with a periodicity between 1 second and 1 day.

9. The static electric induction system according to claim 8 , wherein the oscillation is sinusoidal.

10. The static electric induction system according to claim 8 , wherein the oscillation is periodic with a periodicity between 1 and 20 minutes.

11. The static electric induction system according to claim 1 , wherein the predetermined flow rate curve is pre-programmed in a control unit of the pumping system.

12. A method of reducing hot spots in a static electric induction system, the method including:

cooling a heat generating component of the static electric induction system by means of a flow of cooling fluid through a cooling duct along the heat generating component;

applying a varying flow rate over time of the flow of cooling fluid in the cooling duct along a predetermined flow rate curve, which is a function of time and is not required to be dependent on real-time measurements, by means of a pumping system of the static electric induction system;

wherein the flow rate curve oscillates between a predetermined maximum flow rate and a predetermined minimum flow rate.

13. The method according to claim 12 , wherein a hot spot of the heat generating component moves depending on the varying flow rate.

14. The method according to claim 12 , wherein a flow ratio of the cooling fluid passing through the cooling duct via a first flow path of a plurality flow paths of the cooling duct varies with the varying flow rate.

15. The method according to claim 12 , wherein the flow rate is varying with a periodicity which is less than the time required for the heat generating component to reach thermal steady-state.

16. The method according to claim 15 , wherein the flow rate is varying with a periodicity which is less than a thermal time constant of the heat generating component.

17. The method according to claim 12 , wherein the cooling fluid is circulated in the static electric induction system via a cooling loop including a heat exchanger, wherein the flow rate of the cooling fluid through the heat exchanger is substantially constant.

18. The method according to claim 12 , further including distributing the cooling fluid to the cooling duct via a pressure chamber.

19. The method according to claim 12 , wherein the cooling duct includes a plurality of flow paths connected in parallel with each other.