US 4,113,339 AGranted

Load break bushing

AssigneeWestinghouse Electric Corp.

InventorEdgar R. Eley

Life of this patent

Estimating the term…

Loading patent…

Abstract

An electrical load break bushing having a movable tubular conductor therein, engageable with a contact pin of an electrical connector, is arranged to minimize the duration of arc during load-make and load-break operations. A locking member holds the tubular conductor in a first, normally-open position until the contact pin engages the tubular conductor whereon the mated tubular conductor and contact pin assembly move toward a second, normally-closed position. A second contact, adapted to engage the tubular conductor, is supported by the bushing at the second position and is disposed within the dielectric fluid surrounding an electrical apparatus such that an electrical circuit is completed within the dielectric fluid. During a load-break operation, interlock pins prevent the tubular conductor and contact pin from disengaging until the tubular conductor has separated from the second contact whereby the electrical circuit is broken within the dielectric fluid.

Claims11

Dependent claims

A load-break bushing for a fluid filled electrical apparatus, comprising:

a tank;
an electrical element disposed within said tank;
a quantity of dielectric fluid disposed within said tank;
a hollow elongated housing having an axial passage extending therethrough, said housing having upper and lower portions, said upper portion extending through said tank to the outside thereof, said lower portion extending into said dielectric fluid within said tank;
an electrical conductor, having first and second ends, disposed within said axial passage and adapted for movement therein between a first and second position;
a first electrical contact exteriorly movable relative to said housing;
said first end of said electrical conductor being adapted to engage said first contact;
a second electrical contact attached to said lower portion of said housing such that said second contact is surrounded by said dielectric fluid within said tank, said second contact being adapted to engage said second end of said electrical conductor in said second position and, further, being adapted for connection to said electrical element within said tank;
means for preventing movement of said electrical conductor from said first position until the engagement of said first contact with said first end of said electrical conductor to insure that the electrical circuit between said first contact, said electrical conductor, said second contact and said electrical element is made within said dielectric fluid within said tank;
and
means for sealing said axial passage in said housing to prevent said dielectric fluid from entering therein such that said dielectric fluid surrounds only said second contact.

8 more elements

Dependencies are inferred from the claim text.