Gas circuit breaker and method for attaching bushing

Patent metadata

Field	Value
Publication number	US-9806504-B2
Application number	US-201415035180-A
Country	US
Kind code	B2
Filing date	Jan 27, 2014
Priority date	Jan 27, 2014
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

An adapter with an insertion guide for connection between a porcelain tube and a branch tube is provided at an upper end portion of the branch tube. The adapter with the insertion guide includes an insertion guide portion extending in an axial direction of the branch tube. After inserting a lower end of a central conductor into an insertion portion of an arc-extinguishing chamber, a flange of the porcelain tube is inserted into the adapter with the insertion guide by guidance of the insertion guide portion. Accordingly, in a state where a bushing and the branch tube are self-aligned with each other, a lower end portion of the central conductor is inserted into the insertion portion.

First claim

The invention claimed is:

1. A gas circuit breaker comprising:
an arc-extinguishing chamber that is housed in a circuit breaker tank disposed such that an axis is parallel to an installation surface and that includes an insertion portion for attaching a bushing;
a bushing that includes a porcelain tube and a central conductor, the porcelain tube being connected to a branch tube branched from an upper side surface of the circuit breaker tank and including a flange at a lower end portion, the central conductor penetrating through an inside of the porcelain tube, extending a constant distance from a lower end of the porcelain tube, and having a lower end portion inserted through the branch tube into the insertion portion; and
an adapter with an insertion guide that is provided at a leading end portion of the branch tube for connection between the porcelain tube and the branch tube, and that includes a base portion abutting against a lower end surface of the flange and an insertion guide portion erected on an upper end surface of the base portion and extending in an axial direction of the branch tube, wherein
after a lower end of the central conductor is inserted into the insertion portion, the flange is inserted into the adapter with the insertion guide in accordance with guidance of the insertion guide portion such that the bushing and the branch tube are self-aligned with each other, and
a height of the insertion guide portion is set such that, at least when the lower end of the central conductor coincides with an upper end of the insertion portion in the axial direction, a gap is kept between an upper end of the insertion guide portion and a lower end of the flange in the axial direction.

2. The gas circuit breaker according to claim 1 , wherein
the flange has an annular shape, and
the insertion guide portion has a cylindrical shape.

3. The gas circuit breaker according to claim 1 , wherein the insertion guide portion is detachably provided at a base portion of the adapter with the insertion guide.

4. The gas circuit breaker according to claim 1 , wherein the bushing is inclined with respect to the installation surface.

5. The gas circuit breaker according to claim 1 , wherein the porcelain tube is a polymer porcelain tube.

6. A method for attaching a bushing to a gas circuit breaker comprising an arc-extinguishing chamber, a bushing, and an adapter with an insertion guide, the arc-extinguishing chamber being housed in a circuit breaker tank disposed such that an axis is parallel to an installation surface and including an insertion portion for attaching a bushing, the bushing including a porcelain tube and a central conductor, the porcelain tube being connected to a branch tube branched from an upper side surface of the circuit breaker tank and including a flange at a lower end portion, the central conductor penetrating through an inside of the porcelain tube, extending a constant distance from a lower end of the porcelain tube, and having a lower end portion inserted through the branch tube into the insertion portion, the adapter with the insertion guide being provided at a leading end portion of the branch tube and including a base portion abutting against a lower end surface of the flange and an insertion guide portion erected on an upper end surface of the base portion and extending in an axial direction of the branch tube,
the method comprising:
a step of inserting a lower end of the central conductor through the branch tube into the insertion portion such that a gap is provided in the axial direction between the flange and the insertion guide portion;
a step of inserting a lower end portion of the central conductor into the insertion portion in a state where the bushing and the branch tube are self-aligned with each other by inserting the flange into the adapter with the insertion guide in accordance with guidance of the insertion guide portion; and
setting a height of the insertion guide portion such that, at least when the lower end portion of the central conductor coincides with an upper end of the insertion portion in the axial direction, a gap is kept between an upper end of the insertion guide portion and a lower end of the flange in the axial direction.

Assignees

• Mitsubishi Electric Corp

Inventors

• Yoshitomo Yuji
• Yoshida Daisuke

Classifications

• H02B13/0358 Primary

  Connections to in or out conductors (connectors in general H01R) · CPC title

• H01H33/64

  wherein the break is in gas (vacuum switches H01H33/66) · CPC title

• H01H33/027

  Integrated apparatus for measuring current or voltage · CPC title

• H01H33/025

  Terminal arrangements (for vacuum switches H01H33/6606) · CPC title

• H01H69/00

  Apparatus or processes for the manufacture of emergency protective devices · CPC title