Terminal bushing having integral overvoltage and overcurrent protection

A bushing for interconnecting electrical apparatus to an electrical conductor, comprising:

• an insulative bushing body having an internal chamber and first and second ends;
• a conducting stud having a first portion retained in said internal chamber and a second portion extending outside of said bushing body at said second end, said second portion of said stud adapted for interconnection to the electrical apparatus;
• first terminal on said first end of said bushing body for connection to the electrical conductor;
• a plurality of nonlinear resistors retained in said bushing body;
• a conducting member electrically in series with said nonlinear resistors, a portion of said conducting member extending outside of said bushing body;
• a support member connected to said bushing body;
• a first conductive path through said bushing body, said first conductive path comprising said conducting stud and a fuseholder supported by said support member;
• and
• a second conductive path through said bushing body, said second conductive path comprising said terminal, said nonlinear resistors and said conducting member.

A terminal bushing assembly comprising:

• an insulative body having an udder, central and a lower portion;
• an upper longitudinal bore formed in said upper portion of said body;
• a lower longitudinal bore formed in said lower portion of said body;
• a first radial bore formed in said body, said first radial bore intersecting said upper longitudinal bore;
• a second radial bore formed in said body, said second radial bore intersecting said lower longitudinal bore;
• a conducting stud retained in said lower longitudinal bore, said conducting stud having an extending portion extending outside of said insulative body;
• a line terminal on said upper portion of said insulative body;
• a conducting member retained in said upper radial bore, said conducting member having an extending portion extending outside of said insulative body;
• a plurality of surge arresting elements disposed in said upper longitudinal bore;
• means for electrically interconnecting said conducting member and said surge arresting elements;
• and
• means for electrically interconnecting said surge arresting elements and said line terminal.

A terminal bushing assembly comprising:

• an insulative body having an upper, central and a lower portion;
• an upper longitudinal bore formed in said upper portion of said body;
• a lower longitudinal bore formed in said lower portion of said body;
• a first radial bore formed in said body, said first radial bore intersecting said upper longitudinal bore;
• a second radial bore formed in said body, said second radial bore intersecting said lower longitudinal bore;
• a conducting stud retained in said lower longitudinal bore, said conducting stud having an extending portion extending outside of said insulative body;
• a line terminal on said upper portion of said insulative body;
• an upper fuse support having a first end attached to said insulative body and having a second end spaced-apart from said first end;
• an upper terminal assembly on said second end of said upper fuse support;
• means for electrically interconnecting said upper terminal assembly and said line terminal so as to form a conductive path therebetween;
• a lower fuse support having a first end attached to said insulative body and a second end spaced-apart from said first end;
• a lower terminal assembly on said second end of said lower fuse support;
• means for electrically interconnecting said lower terminal assembly and said conducting stud so as to form a conductive path therebetween;
• said means for electrically interconnecting said lower terminal assembly and said conducting stud comprising:
• a conductive terminal block disposed in said lower longitudinal bore of said insulative body, said terminal block including a receiving bore coaxially aligned with said lower radial bore of said insulative body;
• an insulator having a central bore coaxially aligned with said receiving bore of said terminal block;
• a mounting hinge having an aperture aligned with said receiving bore of said terminal block;
• and
• a fastener having a conductive shank disposed through said aperture in said mounting hinge and through said bore in said insulator and retained in said receiving bore of said terminal block.

A transformer comprising:

• an enclosure;
• a transformer winding retained in said enclosure;
• a bushing body attached to said enclosure;
• a bushing stud electrically interconnected with said winding and disposed through said enclosure and extending into said bushing body;
• a line terminal on said bushing body for connection to a line potential conductor;
• at least one nonlinear resistor retained in said bushing body;
• a fuseholder supported from said bushing body;
• a first current path from said line terminal through said fuseholder and through said bushing stud;
• and
• a second current path from said line terminal through said nonlinear resistor.