Disconnector device for a surge arrester and a protection assembly comprising a surge arrester connected to such a disconnector device

Patent metadata

Field	Value
Publication number	US-10109399-B2
Application number	US-201715703378-A
Country	US
Kind code	B2
Filing date	Sep 13, 2017
Priority date	Sep 13, 2016
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

This disclosure concerns a disconnector device for a surge arrester. The disconnector device comprises a housing encompassing a cavity and a disconnector unit provided inside the cavity. The disconnector device is connectable to the surge arrester and to ground potential. The housing forms an inner housing of a housing unit. The housing unit comprising an inner housing and an outer housing. The at least one ventilation opening of the inner housing is fluidly connected to the at least one further ventilation opening of the outer housing such that a labyrinth with a gas escape path for the gases from the operating disconnector cartridge is formed.

First claim

The invention claimed is:

1. A disconnector device for a surge arrester, the disconnector device comprising:
a housing encompassing a cavity;
a disconnector unit provided inside the cavity, having a first terminal that is connectable to the surge arrester, a second terminal that is connectable to ground potential, a member provided at the second terminal and being fitted to the housing, and a disconnector cartridge provided in the cavity;

wherein the housing forms an inner housing of a housing unit, the housing unit comprising further an outer housing, and
wherein the inner housing comprises at least one ventilation opening connecting the cavity to an outside of the inner housing, and
wherein the outer housing comprises at least one further ventilation opening connecting the outside of the inner housing to an outside of the disconnector device for releasing gases from the operating disconnector cartridge, and
wherein the at least one ventilation opening and the at least one further ventilation opening are displaced against one another such that a labyrinth with a gas escape path for the gases from the operating disconnector cartridge is formed.

2. The disconnector device according to claim 1 , wherein the labyrinth is designed such that no particle originating from the cavity can leave the cavity to the outside of the disconnector device unimpededly.

3. The disconnector device according to claim 1 , wherein the at least one further ventilation opening is designed such that no particles of harmful size that are potentially capable of igniting a fire can pass through them.

4. The disconnector device according to claim 1 , wherein the movable member is arranged in the housing in a movable manner such that it is guided by the inner housing from an initial position to an end position at an end of the cavity by gas from the disconnector cartridge in an operating state of the disconnector unit.

5. The disconnector device of claim 4 , wherein the housing unit has a retaining section for retaining the movable member at the retaining section once the movable member was propelled towards the end of the cavity.

6. The disconnector device of claim 5 , wherein the retaining section of the housing unit is formed in that the inner housing protruding into the cavity.

7. The disconnector device of claim 1 , wherein the housing unit has an opening at the end of the cavity, and wherein the movable member and the opening are adjusted to each other such that a portion of the movable member fits into that opening and thereby closes it.

8. The disconnector device of claim 7 , wherein the movable member has a tubular section with a diameter fitting to the opening such that a movement of the movable member during operation of the disconnector unit is guided by the opening.

9. The disconnector device of claim 7 , wherein after operation of the disconnector unit, a portion of the movable member protrudes through the opening such that it is visible from an outside of the housing to an observer.

10. The disconnector device of claim 9 , wherein the portion of the movable member that is protruding through the opening is formed by the tubular section.

11. The disconnector device of claim 9 , wherein the tubular section of the movable member is that long that it protects a ground cable from buckling at the time of operating the disconnector device once the ground cable is connected to the second terminal.

12. The disconnector device of claim 8 , wherein at least the portion of the movable member protruding through the opening after operation of the disconnector unit has a signal color for indicating on whether the disconnector unit already operated or whether it is still in its pristine state.

13. The disconnector device of claim 1 , wherein the at least one ventilation opening is formed as a plurality of openings in the inner housing.

14. The disconnector device of claim 1 , wherein the at least one ventilation opening has a slot-like shape extending in the direction of a longitudinal axis defined by the overall shape of the cavity and a moving direction of the movable member.

15. The disconnector device of claim 1 , wherein at least a part of the movable member has a cup shaped portion, and wherein the cup portion encompasses the disconnector cartridge at least partly.

16. The disconnector device of claim 1 , wherein the housing unit is mechanically connected to the first terminal of the disconnector unit.

17. The disconnector device of claim 1 , wherein a cross-section of the movable member and of the cavity is of polygonal shape.

18. An overload protection assembly, comprising a high voltage surge arrester and a disconnector device according to claim 1 ,
wherein a first terminal of the surge arrester is electrically connectable to an electrical grid line; and
wherein the first terminal of the disconnector device is electrically connected to a second terminal of the high voltage surge arrester; and
wherein the second terminal of the disconnector device is electrically connectable to ground potential.

19. The disconnector device of claim 2 , wherein the housing unit has an opening at the end of the cavity, and wherein the movable member and the opening are adjusted to each other such that a portion of the movable member fits into that opening and thereby closes it.

20. An overload protection assembly, comprising a high voltage surge arrester and a disconnector device according to claim 2 ,
wherein a first terminal of the surge arrester is electrically connectable to an electrical grid line; and
wherein the first terminal of the disconnector device is electrically connected to a second terminal of the high voltage surge arrester; and
wherein the second terminal of the disconnector device is electrically connectable to ground potential.

21. The disconnector device according to claim 1 , wherein the labyrinth continues to exist after an electrical separation of the first terminal from the second terminal.

22. The disconnector device according to claim 21 , wherein the at least one ventilation opening of the inner housing penetrates therethrough transversely to a direction of a longitudinal axis of the disconnector unit defined by the overall shape of the cavity and a moving direction of the movable member.

Assignees

• Abb Schweiz Ag

Inventors

• Boese Ronald
• Gariboldi Nicola
• Mugwyler Remo
• Antelo Joel

Classifications

• H01H9/30

  Means for extinguishing or preventing arc between current-carrying parts · CPC title

• H01H39/002

  provided with a cartridge-magazine · CPC title

• H01H85/44

  Structural association with a spark-gap arrester · CPC title

• H01H9/14

  Adaptation for built-in safety spark gaps · CPC title

• H01T1/14 Primary

  Means structurally associated with spark gap for protecting it against overload or for disconnecting it in case of failure (H01T1/15, H01T1/16, H01T1/18 take precedence; emergency protective circuit arrangements for spark gap arrestors H02H7/24) · CPC title