Insulation of busbars using insulating members having corrugated sections

• US 8,258,404 B2
• Filed: 06/19/2009
• Issued: 09/04/2012
• Est. Priority Date: 06/19/2009
• Status: Active Grant

• Current Assignee: Schneider Electric USA, Inc. (Schneider Electric SE)
• Original Assignee: Schneider Electric USA, Inc. (Schneider Electric SE)
• Inventors: Latimer, Drew
• Primary Examiner(s): Estrada, Angel R
• Application Number:
  US12/487,801
• Publication Number:
  US 20100319958A1
• Time in Patent Office: 1,173 Days
• Field of Search: 174/68.2, 174/72.B, 174/71.B, 174/137.B, 174/88.B, 174/70.B, 174/99.B, 174/129.B, 174/133.B, 174/149.B, 174/110.D, 174/110.R, 174/137.R, 174/148, 174/149.R, 298/25, 439/212, 439/213, 439/214, 361/675, 361/715, 361/600, 361/611, 361/637, 361/638, 361/639, 361/648, 361/649
• US Class Current: 174/149.B
• CPC Class Codes: H02G 5/005 Laminated bus-bars
• CPC Class Codes: Y10T 29/49117 Conductor or circuit manufacturing

Abstract

Busbars of a busway system are insulated so as to minimize or eliminate air gaps between busbars. In an embodiment, an insulating sheath is provided with corrugations in regions corresponding to busbar bends. The corrugations allow the sheath to follow the busbar bends without the need to cut or interrupt the sheath. Busbars may therefore be fully insulated without the need for further insulating materials (e.g., tape). Good thermal contact between busbars throughout their length is achieved, improving heat dissipation and efficiency.

Claims

1. An insulating sheath for insulating an electrical busbar, the busbar having a curved portion that includes a bend, the insulating sheath comprising at least one corrugated portion having corrugations, the corrugated portion allowing the insulating sheath to follow a curve of the bend in the busbar when applied to the busbar.

2. The insulating sheath of claim 1, wherein the insulating sheath is flexible.

3. The insulating sheath of claim 1, wherein the corrugations are configured such that when the insulating sheath is placed on the busbar with the corrugated portion overlying the bend of the curved portion of the busbar, corrugations of the corrugated portion flatten out along outside radii of the curved portion and bunch together along inside radii of the curved portion.

4. The insulating sheath of claim 3, wherein the insulating sheath is flexible.

5. The insulating sheath of claim 1, wherein the insulating sheath is formed of polyester film.

6. The insulating sheath of claim 1, wherein the insulating sheath has a U-shaped cross section.

7. Electrical distribution equipment comprising:

a busbar having a curved portion that includes a bend; and

an insulating sheath applied to the busbar, the insulating sheath having a corrugated portion allowing the insulating sheath to follow a curve of the bend in the busbar.

8. The electrical distribution equipment of claim 7, wherein:

the busbar is a plurality of busbars each having a curved portion that includes a bend, the plurality of busbars including adjoining busbars; and

the insulating sheath is a plurality of insulating sheaths, at least one of the insulating sheaths applied to each of the busbars, each of the insulating sheaths having a corrugated portion allowing the insulating sheath to follow a curve of the bend in the busbar to which the insulating sheath is applied.

9. The electrical distribution equipment of claim 8, wherein each of the plurality of busbars is sized to carry at least 100 amperes of electrical current.

10. The electrical distribution equipment of claim 8, wherein the plurality of busbars are stacked such that along a section thereof each of the plurality of busbars is in close thermal contact with an adjoining busbar.

11. The electrical distribution equipment of claim 7, further comprising a second insulating sheath, wherein the insulating sheath and the second insulating sheath are applied to the same section of busbar, the second insulating sheath comprising a corrugated portion.

12. The busway of claim 11, wherein the insulating sheath and the second insulating sheath are applied overlapping each other such that a majority of a surface of the busbar is covered by both of the insulating sheaths.

13. A method of insulating an electrical busbar having a curved portion that includes a bend, comprising applying an insulating sheath to the electrical busbar, the insulating sheath comprising a corrugated portion, the corrugated portion allowing the insulating sheath to follow a curve of the bend in the busbar when applied to the busbar.

14. The method of claim 13, comprising applying two insulating sheaths to the same section of busbar, each insulating sheath comprising at least one corrugated portion.

15. The method of claim 14, wherein the two insulating sheaths are applied overlapping each other such that a majority of a surface of the busbar is covered by both of the two insulating sheaths.