Electricity: conductors and insulators – Overhead – Towers – poles or posts
Reexamination Certificate
2000-09-01
2001-08-07
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Overhead
Towers, poles or posts
C174S050000, C248S906000, C439S535000
Reexamination Certificate
active
06271467
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an adjustable throat for protecting electrical connections between two mating pieces of electrical equipment, and, more specifically to an adjustable HV/LV throat for protecting electrical connections between a transformer and associated switchgear.
2. Description of the Prior Art
In practice, transformers are connected with associated switch gear by HV/LV bushings. It would be desirable to provide an adjustable throat for protecting such electrical connections between two mating pieces of electrical equipment. It would be desirable for the throat to allow for vertical and horizontal adjustment to allow for final adjustment in these directions and also to allow the throat to be adjusted in and out to allow final connection to the switch gear without the need for minor movement of the gear.
SUMMARY OF THE INVENTION
In accordance with one aspect of the invention there is provided an adjustable throat for protecting electrical connections between two mating pieces of electrical equipment such as a transformer and associated switch gear. The adjustable throat includes a first throat piece having a tubular portion and a flange extending around one end of the tubular portion, a second throat piece having a tubular portion and a flange extending around one end of the tubular portion, the first and second throat pieces having tubular portions dimensioned to telescope with respect to each other, the flanges and the throat pieces having holes therein for connecting one of the throat pieces to a transformer and the other of the throat pieces to associated switchgear and the tubular portions of the throat pieces having structure to provide in and out adjustment with respect to each other as well as the ability to lock the throat pieces in final position. A weather resistant sealing gasket is located between the tubular portions of the throat pieces. Further in accordance with the invention the holes in at least one of the flanges in the throat pieces are oversized and allow for vertical and horizontal adjustment to allow for final adjustment in these directions with respect to the mating pieces of electrical equipment.
REFERENCES:
patent: 3620404 (1971-11-01), Grasso
patent: 4794207 (1988-12-01), Norberg et al.
patent: 4872512 (1989-10-01), Multer
patent: 5189259 (1993-02-01), Carson et al.
patent: 5380951 (1995-01-01), Comerci et al.
patent: 5861576 (1999-01-01), Langston et al.
patent: 6133524 (2000-10-01), Bosse, Jr.
Book William J.
Hemeyer Keith
Reinke David A.
ABB Power T&D Company Inc.
Patel Dhiru R
Reichard Dean A.
Woodcock Washburn Kurtz Mackiewicz & Norris LLP
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