High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Operating mechanism structure or arrangement
Reexamination Certificate
1999-08-05
2001-10-30
Scott, J. R. (Department: 2832)
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Operating mechanism structure or arrangement
C218S065000, C218S155000
Reexamination Certificate
active
06310311
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to the field of high voltage electrical switch gear components. More particularly, the present invention relates to the field of pad mounted three-phase switch gear components. With even greater particularity, the present invention relates to pad mounted three-phase high voltage switch gear components employing what is generally known as a dead front type configuration with an electrical through bushing transferring current through the dead front wherein an electrical arc extinguishing pump assembly is utilized to snuff out the electrical arc formed when the electrical current is disengaged by a switch gear assembly positioned behind the dead front. With even further particularity, the present invention relates to a high voltage switch gear component integrating an electrical through bushing and an electrical arc extinguishing pump assembly into a single component.
BACKGROUND OF THE INVENTION
The current industry practice and design with regard to dead front type switch gear is to utilize separately mounted components for extinguishing the electrical arc created when a high voltage switch is opened, and for transferring the electrical current through a dead front barrier from the hot, or live side of the barrier to the dead front, or safe side of the barrier, to what is generally termed an elbow connector. An elbow connector is used on the safe side of the dead front to electrically connect the enclosed switch gear to the desired electrical component, such as a transformer, large electrical machine, or other electrical apparatus. This utilization of separate individual components for the through bushing (A) and the electrical arc extinguishing pump assembly (B), as shown in prior art
FIG. 1
, necessitates the use of an electrical bus (C) and two sets of connecting hardware to electrically interconnect the separately mounted components, as well as two sets of mounting hardware (D) to secure the individual components. Additionally, as standard industry procedure is to mount the through bushing immediately above the electrical arc extinguishing pump assembly, the current practice of utilizing separate components requires substantial vertical area to accommodate the separately mounted components behind the dead front barrier. Inasmuch as these particular types of electrical components are nearly always mounted within an a grounded conductive cabinet with the high voltage conductive current carrying parts insulated from the cabinet, the requirement of substantial vertical area to accommodate the separately mounted electrical components inherently necessitates that the grounded conductive cabinets be manufactured to an increased size or dimension in order to accommodate the substantial vertical area necessary to house the individually mounted components. This increased size or dimension directly increases the manufacturing costs of the cabinets.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a through the wall type electrical transfer bushing having an integrally formed housing for receiving an electrical arc extinguishing pump assembly for use in pad mounted electrical switch gear installations. It is a further object of the present invention to provide an integrated electrical through bushing and electrical arc extinguishing pump housing which allows for the elimination of the electrical bus interconnection between the individual bushing and housing components for use in pad mounted electrical switch gear. It is a further object of the present invention to provide an integrated electrical through bushing and electrical arc extinguishing pump housing utilizing substantially less component area for use in pad mounted switch gear. It is further object of the present invention to provide an integrated electrical through bushing and electrical arc extinguishing pump housing, which can be integrally mounted to a dead front barrier or built into a switch assembly for use with a dead front barrier. Further, it is an object of the present invention to provide an integrated electrical through bushing and electrical arc extinguishing pump housing utilizing substantially less material, mounting hardware, and vertical space, therefore reducing the manufacturing, material, and installation costs.
REFERENCES:
patent: 2872550 (1959-02-01), Schwager
patent: 3891893 (1975-06-01), Thaler
patent: 4514606 (1985-04-01), Veverka
patent: 5091616 (1992-02-01), Ramos et al.
patent: 5510590 (1996-04-01), Hux
patent: 5561280 (1996-10-01), Blatter
patent: 5600112 (1997-02-01), Opfer
patent: 5898150 (1999-04-01), Gallix et al.
Hakes Gary
Himstedt Glenn E.
Scott J. R.
Veal Robert J.
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