Low-inductance planar bus arrangement

• US 5,808,240 A
• Filed: 05/24/1996
• Issued: 09/15/1998
• Est. Priority Date: 05/24/1996
• Status: Expired due to Fees

• Current Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Original Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Inventors: Shepard, Mark E., Czerwinski, Christopher S.
• Primary Examiner(s): Kincaid, Kristine L.
• Assistant Examiner(s): PATEL, DHIRUBHAI R
• Application Number:
  US08/653,521
• Time in Patent Office: 844 Days
• Field of Search: 174/72 B, 174/88 B, 174/70 B, 174/99 B, 174/137 B, 174/149 B
• US Class Current: 174/149.00B
• CPC Class Codes: H01L 23/66 High-frequency adaptations
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

A low inductance bus bar arrangement includes two electrical conductors and an insulating system. The insulation system includes an insulation material and is disposed between the conductors. The insulation material has a thickness equal to or greater than a thickness threshold such that partial discharge in the insulating material is minimized.

Claims

1. A low inductance bus bar arrangement comprising:

two electrical conductors each having a substantially planar area; and

an insulating system disposed between said conductors, said insulating system having an insulating material, the insulating material having a thickness equal to or greater than a thickness threshold such that partial discharge in the insulating system is minimized, wherein said thickness threshold is determined in accordance with the following relationship;

##EQU12## wherein δ

_d.sbsb.--_THRESHOLD is the thickness threshold;

ε

_d is a dielectric constant of the insulating material;

PD_THRESHOLD is a partial discharge voltage threshold; and

β

is a coefficient which is selected as follows;

β

=1for inception voltage under uniform fields

β

=0.67 for inception voltage under non-uniform field (33% reduction)

β

=0.85 for extinction voltage under uniform fields (15% reduction)

β

=0.57 for extinction voltage under non-uniform fields.

2. A low inductance bus bar arrangement as recited in claim 1, wherein said insulating material has a thickness of substantially 0.04 inches.

3. A low inductance bus bar arrangement as recited in claim 1, wherein said thickness threshold is substantially in the range of 0.001 inches to 0.10 inches.

4. A low inductance bus bar arrangement as recited in claim 1, wherein said insulating material comprises an organic material.

5. A low inductance bus bar arrangement as recited in claim 1, wherein said insulating material comprises polypropylene.

6. A low inductance bus bar arrangement as recited in claim 1, wherein said insulating material comprises polyester.

7. A low inductance bus bar arrangement as recited in claim 1, wherein said insulating material comprises aramid paper.