Electrical bushings with resin casting

A method of releasably securing an improved cast resin bushing assembly to a transformer casing having an opening by providing:

• a bushing which includes locating means for aligning the bushing assembly or part thereof within said opening in said transformer casing;
• the bushing further includes locking means for releasably securing the bushing assembly to said transformer casing;
• the locking means including a threaded section moulded into the bushing which is adapted to be engaged by a collar inside said transformer casing;
• a bushing conductor integrally moulded to said bushing;
• and
• a bushing flange in circumferential arrangement to the bushing;
• said method including the steps of:
• positioning said locating means on said bushing within said opening in said transformer casing so as to align said bushing assembly;
• mounting said bushing flange on an outside surface surrounding the opening in said transformer casing;
• and,
• releasably securing the bushing assembly within the transformer casing by engaging said locking means inside the transformer casing.

A method of releasably securing an improved cast resin bushing assembly to a transformer casing having an opening by providing a bushing assembly including:

• a bushing which is formed from a cast resin polymer and which includes locating means defined by one of a groove or flat portion for aligning the bushing assembly or part thereof within said opening in the transformer casing;
• the bushing further includes a threaded section for securing the bushing assembly to the transformer casing;
• a threaded collar;
• a bushing conductor integrally moulded to said bushing;
• and
• a bushing flange in circumferential arrangement with the bushing;
• said method includes the steps of:
• positioning said locating means on said bushing within said opening in said transformer casing so as to align said bushing assembly;
• mounting said bushing flange on an outside surface surrounding said opening in said transformer casing;
• and,
• releasably securing the bushing assembly within the transformer casing by engaging the threaded section on the bushing on the inside of the transformer casing with the threaded collar.

An improved cast resin bushing assembly for use in a transformer including:

• a bushing which is made from a cast resin polymer, which is cast in angular or bifurcated construction relative to a transformer casing and which includes locating means for aligning the bushing assembly within the transformer casing;
• said busing further comprising locking means for releasably securing the bushing assembly to said transformer casing;
• a bushing conductor integrally moulded to said bushing;
• and
• a bushing flange in circumferential arrangement with the bushing.

An improved cast resin bushing assembly for use in a transformer including:

• a bushing which includes locating means for aligning the bushing assembly within a transformer casing;
• said bushing being cast from a cycloaliphatic epoxy resin system;
• said busing further comprising locking means for releasably securing the bushing assembly to said transformer casing;
• a bushing conductor integrally moulded to said bushing;
• a bushing flange in circumferential arrangement with the bushing.

A method of releasably securing an improved cast resin bushing assembly to a transformer casing having an opening by providing:

• a bushing which includes a locating means for aligning the bushing assembly or part thereof within said opening in said transformer casing;
• the bushing further includes a locking means for releasably securing the bushing assembly to said transformer casing;
• a bushing conductor integrally moulded to said bushing;
• and
• a bushing flange in circumferential arrangement to the bushing;
• positioning said locating means on said bushing within said opening in said transformer casing so as to align said bushing assembly;
• and said method comprising the steps of:
• casting said bushing from a cycloaliphatic epoxy resin system;
• mounting said bushing flange on an outside surface surrounding the opening in said transformer casing;
• and,
• releasably securing the bushing assembly within the transformer casing by engaging said locking means inside the transformer casing.