Not Applicable.
A fuse cutout as used in electrical distribution is primarily used to protect distribution transformers from current surges and overloads. An overcurrent, caused by a fault in a transformer, for example, will cause the fuse to melt, or operate, thus disconnecting the transformer from the line. It can also be opened manually.
A cutout consists of three major components. The cutout body provides a frame that supports the fuse holder and an insulator that electrically isolates the conductive portions of the support to which the insulator is fastened; the fuse holder or barrel, which contains the interchangeable fuse element or fuse; and, the fuse element, which is the replaceable portion of the assembly that melts or operates due to excessively high electrical currents. Fuses are provided to operate at suitable ampere ratings ranging from 1 to 200 amperes.
A fuse cutout is usually mounted about 20 degrees off vertical so that the center of gravity of the fuse holder is displaced when the fuse element operates, and the fuse holder will rotate by its own weight away from the cutout body when the fuse blows. Each fuse holder will have an attached pull ring or other structure that can be engaged by a hook to manually open the switch.
Overhead high voltage electrical distribution lines in the United States use fuses to protect the integrity of the delivery system from electrical current surges and overloads. These fuses typically are in 100 amp or 200 amp models. When the fuse is triggered, the bottom portion of the fuse barrel explodes and the fuse link is destroyed. This explosion causes a large spark as well as other fuse debris to be discharged downwardly from the bottom portion of the fuse barrel. Once the fuse is blown, the fuse barrel hangs in a downward fashion from the overhead line and visual inspection can verify the blown fuse.
A common safety problem occurs with fuses when the fuse is triggered while an electrical worker (typically referred to as a “linesman”) is in close proximity to the fuse. The linesman can be seriously injured by the sparks and debris that shoot out of the bottom of the fuse barrel. The present invention is directed to providing a fuse deflector or shield that will deflect away from the lineman, the sparks and debris typically released from the bottom of the fuse barrel when there is an electrical surge and/or overload to high voltage overhead electrical lines.
It is an object of the present invention to provide a deflector or shield to direct the sparks and debris that are ejected from the bottom of a fuse barrel upon the event of an electrical surge or overload that activates the fuse.
It is a further object of the present invention to provide a safety device to protect linemen from the sparks and debris that are ejected when a fuse operates while the linemen are performing their work on high voltage overhead electrical lines.
It is a further object of the present invention to direct the sparks and debris that are ejected upon actuation of the fuse in a direction away from the lineman working nearby.
It is a still further object of the present invention to provide a clip member to facilitate the use of a hot stick to remove blown fuse tubs and to install new fuse tubes.
It is another object of the present invention to provide a fuse deflector that is simple in construction, economical to manufacture and simple and efficient to use.
With the above and other objects in view, the present invention consists of the combination and arrangement of parts hereinafter more fully described, illustrated in the accompanying drawing and more particularly pointed out in the appended claims, it being understood that changes may be made in the form, size, proportions and minor details of construction without departing from the spirit or sacrificing any of the advantages of the invention.
These and other features, aspects and advantages of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings where:
To protect electrical line workers, the present invention is directed to a one or two piece fuse deflector having a deflecting member and a clip member.
Operation
The present invention is a one or two-piece implement formed from hard plastic with flame retardant properties, including, but not limited to sycolac resin MG 47-F and ABS (acrylonitrile butadine styrene).
To utilize the present invention, a linesman attaches the deflecting member 10 such that the area with the grips 20 is engaged with the fuse barrel 101 of the fuse 100. The clip member 50 is then raised to engage via the grips 58 with the area opposite the circumference of the fuse where the deflecting member 10 is being held. The clip member 50 is then connected to the deflecting member 10 such that the clip constituents 23 are joined through the cavities 55 and such that the ridged walls 60 are secured with the ridged sides 19 to join both the deflecting member 10 and the clip member 50 around the circumference of the fuse barrel 101. The deflecting plate 12 is to be adjusted such that it is positioned under the bottom of the fuse barrel 101.
To utilize the one piece structure of the present invention, a lineman attaches the deflecting member 30 by snapping the fuse barrel into engagement with the flexible attaching members 35, along the length of the fuse barrel 101 with the deflecting plate positioned just below and extending under the lower end of the fuse barrel 101 to redirect the sparks and fuse debris in the event that the fuse operates.
As shown in
Another feature of the disclosed invention includes the engagement of the deflecting member 10 and the clip member 50 to allow for different sized fuse barrels, which typically are between 1 inch and 1 and 3/16 inches.
In another feature of the invention, the clip member 50 is formed such that a lineman can lift said member into place using what is known in the industry as a “hot stick.” A hot stick is a long insulated pole with a metal end. The lineman engages the hot stick with the clip member 50 such that the hot stick fits in between the space formed by attaching member 51, the angled member 54 and the top member 52. The hot stick is then raised from the ground (or the utility pole) and engaged around the fuse barrel circumference with the deflecting member 10 to provide the fuse blow out prevention as described above.
From the descriptions above, a number of advantages of the fuse deflector become evident:
1. An easy, efficient and cost-effective way to protect workers in close proximity to overhead fuses associated with high voltage electrical lines;
2. An easily placed safety system which does not interrupt the flow of electricity of high voltage electrical lines;
3. A removable safety device to protect workers in close proximity to overhead fuses; and,
4. Adjustable devices which can fit on a number of different circumferences fuse barrels to protect workers in close proximity to overhead fuses.
The foregoing specification sets forth the invention in its preferred, practical forms but the structure shown is capable of modification within a range of equivalents without departing from the invention which is to be understood is broadly novel as is commensurate with the appended claims.
This application claims the benefit of U.S. Provisional Application Ser. No. 61/387,063 filed Sep. 28, 2010.
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Number | Date | Country | |
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61387063 | Sep 2010 | US |