Electrical equipment for distribution network

Abstract

The electrical equipment comprises electrical elements corresponding to at least one phase of the distribution network and housed in a tank. The equipment is insulated with a dielectric liquid wherein the elements are immersed. The equipment comprises an input for each phase in the tank, and also a protection device, associated with at least one failure detector and configured so that, in the event of detecting such a failure, a short circuit will be established in the phases. The protection device is situated so as to establish the short circuit in a position before any protection, control or transformer element of the electrical equipment.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

To complement the description and in order to aid comprehension of the various characteristics, according to certain examples of practical embodiments, a set of figures is included as an integral part of said description, wherein the following has been represented in an illustrative and non-limiting manner:

FIG. 1 shows a single-line diagram of a transformer substation according to one embodiment.

FIG. 2 shows a single-line diagram of a self-protected transformer according to one embodiment.

FIG. 3 shows electrical equipment with medium voltage inputs/outlets, forming a rigid loop.

FIGS. 4-5 show a view of a possible configuration for the short-circuiting device according to one embodiment.

FIG. 6 shows a view of a possible configuration for the short-circuiting device according to one embodiment.

FIG. 7 shows electrical equipment with the short-circuiting device in a separate tank from the tank that houses the equipment to be protected.

Claims

1. An electrical equipment device of an electricity distribution network, the device comprising: at least one electrical element corresponding to at least one phase of the distribution network and housed in a tank, the device being insulated with a dielectric liquid wherein the electrical element is immersed and which, at least partially, fills the tank;an input for each phase in the tank; anda short-circuiting device associated with at least one failure detector configured to detect a failure due to a fault in the insulation, the short-circuiting device being configured to establish a short circuit in the phases if there is an event indicative of the detection of the failure, wherein the short circuit is located along an electrical path before any of a over-current protection device, a control element, and a transformer.

2. The device according to claim 1, wherein the short-circuiting device is configured to establish the short circuit in a position along the electrical path after the input of the phases into the tank.

3. The device according to claim 2, further comprising, in correspondence with at least one phase, a control device configured to interrupt or cut off the phase, the short-circuiting device being further configured to establish the short circuit between the input of the phase into the tank and the control device.

4. The device according to claim 2, further comprising, in correspondence with at least one phase, an over-current protection device configured to interrupt the phase in response to an overcurrent in the phase, wherein the short-circuiting device is further configured to establish the short circuit between the input of the phase and the over-current protection device.

5. The device according to claim 1, wherein the short-circuiting device is situated as the first element of the device in correspondence with each phase, after the input of the corresponding phase into the tank.

6. The device according to claim 1, wherein the short-circuiting device is situated outside the tank.

7. The device according to claim 6, wherein the tank is a first tank of the electrical equipment, the short-circuiting device is situated in a second tank, and the phases pass through the short-circuiting device before entering into the first tank.

8. The device according to claim 6, further comprising, in correspondence with at least one phase, a control device configured to interrupt or cut off the phase, wherein the short-circuiting device is further configured to establish the short circuit of the at least one phase before the control device.

9. The device according to claim 6, further comprising, in correspondence with at least one phase, an over-current protection device configured to interrupt the phase in response to an overcurrent in the phase, the short-circuiting device being further configured to establish the short circuiting of the at least one phase before the over-current protection device.

10. The device according to claim 1, wherein the short-circuiting device is further configured to establish a short circuit between at least two phases.

11. The device according to claim 1, wherein the short-circuiting device is configured to establish a short circuit between the phase and earth.

12. The device according to claim 1, comprising a transformer that comprises a transformer element housed in the tank.

13. The device according to claim 12, wherein the transformer is a self-protected transformer, with at least one internal fuse associated with the at least one phase, the fuse being situated after the short-circuiting device in a direction corresponding to a flow of electrical energy through the device.

14. The device of claim 1, comprising a transformer substation that comprises: a transformer;a plurality of control switches; anda plurality of over-current protection devices.

15. The device of claim 1, comprising a higher voltage part and a lower voltage part, the input of the phase corresponding to the higher voltage part.

16. The device of claim 1, comprising an input part for a flow of electrical energy, the input of the phase corresponding to the input part.

17. The device according to claim 1, wherein the failure detector is configured to generate an event indicative of the detection of a failure in response to a change in pressure inside the tank.

18. The device according to claim 1, wherein the failure detector is configured to generate an event indicative of the detection of a failure in response to the presence of light inside the tank.

19. The device according to claim 1, wherein the failure detector is configured to generate an event indicative of the detection of a failure in response to the detection of gases inside the tank.

20. The device according to claim 1, wherein the failure detector is configured to generate an event indicative of the detection of a failure in response to the detection of an overcurrent in the at least one phase.

21. The device according to claim 1, wherein the failure detector is configured to generate an event indicative of the detection of a failure in response to the detection of currents diverted to earth.

22. The device according to claim 1, wherein the failure detector is situated in the tank.

23. The device according to claim 1, wherein the dielectric liquid comprises mineral oil.

24. The device according to claim 1, wherein the dielectric liquid comprises at least one synthetic ester.

25. The device according to claim 1, wherein the dielectric liquid comprises at least one natural ester.

26. The device according to claim 1, wherein the dielectric liquid comprises at least one silicon oil.

27. The device according to claim 1, wherein the dielectric liquid comprises at least one hydrocarbon with a high molecular mass.