Gas circuit breaker and method for attaching bushing
AssigneeMitsubishi Electric Corporation
InventorsYuji Yoshitomo, Daisuke Yoshida
Life of this patent
Estimating the term…
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.
Claims6
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.
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.
Dependencies are inferred from the claim text.