Insulated electrical bushing and method of producing the same
View Patent ↗The electrical bushing has an electrical conductor with a plurality of different embossment regions. An insulating body is molded over the electrical conductor.
1. An electrical bushing comprising:
a metal conductor having a first embossment region, a second embossment region and a third embossment region serarated from the first and second embossment regions, the first and third embossment regions each being comprised of a pattern of protuberances and the second embossment region comprising at least one annular ring, wherein the protuberances of the first embossment region are not annular rings; and
an insulating body secured to the conductor and being disrosed over the first, second and third embossment regions.
2. The electrical bushing of claim 1 , wherein the insulating body is comprised of a polymeric material.
3. The electrical bushing of claim 2 , wherein the insulating body is comprised of a thermoplastic.
4. The electrical bushing of claim 3 , wherein the thermoplastic is selected from the group consisting of high temperature nylon (HTN), polyethylene terephthalate (PET) and polybutylene terephthalate (PBT).
5. The electrical bushing of claim 1 , wherein the first embossment region comprises diamond knurls.
6. The electrical bushing of claim 1 , wherein the protuberances of the third embossment region are not annular rings.
7. The electrical bushing of claim 6 , wherein the second embossment region is disposed between the first and third embossment regions.
8. The electrical bushing of claim 7 , wherein the second embossment region comprises a plurality of annular rings.
9. The electrical bushing of claim 8 , further comprising a fourth embossment region separated from the first, second and third embossment regions.
10. The electrical bushing of claim 1 , wherein the insulating body is molded around the conductor in an injection over-molding process.
11. The electrical bushing of claim 1 , wherein the conductor further comprises a threaded portion disposed outside the insulating body.
12. The electrical bushing of claim 1 , wherein the conductor comprises a connection spade for connection to a lead of a transformer.
13. The electrical bushing of claim 12 , wherein the insulating body comprises a cylindrical section joined to a flange adapted for securement to a wall of the transformer.
14. A method of forming an electrical bushing comprising:
providing a metal conductor having a first embossment region, a second embossment region and a third embossment region separated from the first and second embossment regions, the first and third embossment regions each being comprised of a pattern of protuberances and the second embossment region comprising at least one annular ring, wherein the protuberances of the first embossment region are not annular rings; and
molding a plastic insulating body over the conductor so as to be disposed over the first, second and third embossment regions.
15. The method of claim 14 , wherein the molding of the plastic insulating body comprises:
placing a portion of the conductor in a cavity of a mold; and
injecting a molten thermoplastic resin into the cavity of the mold.
16. The method of claim 15 , wherein the thermoplastic resin is selected from the group consisting of high temperature nylon (HTN), polyethylene terephthalate (PET) and polybutylene terephthalate (PBT).
17. The method of claim 14 , wherein the first embossment region of the conductor comprises diamond knurls.
18. The method of claim 14 , wherein the protuberances of the third embossment region are not annular rings.
19. The method of claim 14 , wherein the provision of the conductor comprises forming the first and second embossment regions by roll forming.