Insertable pin for high voltage insulating covers

Abstract

A plastic retaining pin for being inserted through a retaining hole in a high voltage insulating cover has a compressible nose, with the wide part of the nose being larger than the retaining hole. The pin may be on the order of 3-12 inches long. The other end of the pin has a grasping ring for receiving the hook of a hot stick. Along the length of the body of the pin is a plurality of radial portions (e.g., six or more) extending outward from a centerline of the body. These radial portions may be skirts or ribs having a diameter less than the retaining hole in the cover. The skirts or ribs greatly increase the surface leakage distance along the body of the pin and also prevent conductive liquids flowing along the body, which may lead to a flashover.

Claims

1. A system for use in high voltage applications comprising: an insulating structure covering a conductor, the insulating structure having a retaining hole; and a retaining pin formed of an insulating material, the retaining pin being inserted through the retaining hole to prevent the insulating structure being inadvertently removed from over the conductor, the retaining pin having a grasping ring at one end configured for receiving a tool at an end of a hot stick for inserting the pin in the retaining hole and removing the pin from the retaining hole, the retaining pin having a nose at its other end, the nose being resiliently collapsible upon a compressive pressure being applied to the nose, a maximum width of the nose being greater than a diameter of the retaining hole, so that the retaining pin is secured in place within the retaining hole by the resilient nose; and the retaining pin having a body extending between the nose and the grasping ring, the body having a plurality of radial portions along its length extending outward from a centerline of the body, the radial portions extending completely around the body, wherein a diameter of the radial portions is less than a diameter of the retaining hole of the insulating structure.

2. The system of claim 1 wherein the plurality of radial portions comprises a plurality of circular ribs.

3. The system of claim 1 wherein the plurality of radial portions comprises a plurality of circular skirts having sides that taper away from the centerline of the body.

4. The system of claim 1 wherein there are at least two radial portions between the nose and the ring.

5. The system of claim 1 wherein there are at least six radial portions between the nose and the ring.

6. The system of claim 1 wherein the insulating structure at least partially covers a wire conducting a voltage.

7. The system of claim 1 wherein there are a plurality of retaining holes in the insulating structure for receiving a plurality of retaining pins.

8. The system of claim 1 wherein the pin is located below the conductor.

9. The system of claim 1 wherein the body and the radial portions are one of circular or oval.

10. A device for retaining an insulating structure over a conductor in high voltage applications, the insulating cover having a retaining hole, the device comprising: a retaining pin formed of an insulating material, the retaining pin being configured to be inserted through the retaining hole to prevent the insulating structure being inadvertently removed from over the conductor, the retaining pin having a grasping ring at one end configured for receiving a tool at an end of a hot stick for inserting the pin in the retaining hole and removing the pin from the retaining hole, the retaining pin having a nose at its other end, the nose being resiliently collapsible upon a compressive pressure being applied to the nose, a maximum width of the nose being greater than a diameter of the retaining hole, so that the retaining pin is secured in place within the retaining hole by the resilient nose; and the retaining pin having a body extending between the nose and the grasping ring, the body having a plurality of radial portions along its length extending outward from a centerline of the body, the radial portions extending completely around the body, wherein a diameter of the radial portions is less than a diameter of the retaining hole of the insulating structure.

11. The device of claim 10 wherein the plurality of radial portions comprises a plurality of circular ribs.

12. The device of claim 10 wherein the plurality of radial portions comprises a plurality of circular skirts having sides that taper away from the centerline of the body.

13. The device of claim 10 wherein there are at least two radial portions between the nose and the ring.

14. The device of claim 10 wherein there are at least six radial portions between the nose and the ring.

15. The device of claim 10 wherein the insulating structure at least partially covers a wire conducting a voltage.

16. The device of claim 10 wherein there are a plurality of retaining holes in the insulating structure for receiving a plurality of retaining pins.

17. The device of claim 10 wherein the body and the radial portions are one of circular or oval.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a side view of a conventional fuse cutout disclosed in Applicant's U.S. Pat. No. 10,679,815.

(2) FIG. 2 is a perspective view of a prior art cutout cover that fits over the cutout and is held in place by retaining pins.

(3) FIG. 3 is a front view and FIG. 4 is a side view of an oval-shaped pin used to secure the cover over the cutout.

(4) FIG. 5 is a perspective view of a dielectric retaining pin, in accordance with one embodiment of the invention, where concentric skirts (tapering outward) are distributed along the body of the pin.

(5) FIG. 6 is a perspective view of a dielectric retaining pin, in accordance with another embodiment of the invention, where concentric ribs (generally constant thickness) are distributed along the body of the pin.

(6) FIG. 7 is a semi-transparent side view of the cutout cover of FIG. 2 being retained in place using the pin of FIG. 5 or 6. The cutout is using a relatively thick porcelain insulator, and one of the pins is inserted through a top set of holes that is not blocked by the insulator.

(7) FIG. 8 is a side view of a cutout cover, similar to that of FIG. 2, being retained in place using the pin of FIG. 5 or 6. The cutout is using a relatively thin polymer insulator, and one of the pins is inserted through a bottom set of holes that is not blocked by the insulator.

(8) Elements labeled with the same numerals in the various figures may be identical or similar.

DETAILED DESCRIPTION

(9) FIGS. 5 and 6 illustrate dielectric retaining pins 50 and 52 that are used to secure dielectric covers over high voltage components. The covers may be cutout covers, covers over insulators supporting wires, or any other type of insulating cover, typically for protecting wildlife from electrocution.

(10) In one embodiment, the pins 50 and 52 are about 4 inches long, and the drawings have generally accurate relative dimensions. The pins 50 and 52 are an injection molded polymer.

(11) The performance of the pins 50 and 52 is exactly like the pin 44 in FIGS. 3 and 4. The only difference is the skirts 54 in FIG. 3 and the ribs 56 in FIG. 6 along the body 58 or 60.

(12) In FIG. 7, the pin 50 or 52 is inserted through the cover's holes 38 and 40 (FIGS. 2 and 7) until the expanded portion 62 of the pin 50 or 52 abuts the cover 32. The expanded portion 62 provides one level of prevention of liquids entering the cover 32 via the pin 50 or 52.

(13) In the event there is a gap between the pin 50/52 and the cover, allowing a liquid to enter the cover 32 via the pin 50/52, the skirts 54 or ribs 56 not only block the liquid from running along the body 58/60 but add a significant surface leakage distance along the body 58/60. This greatly increases the flashover voltage and the insulating properties of the cover assembly in high moisture conditions.

(14) In FIG. 7, the insulator 14 is a porcelain (ceramic) type, which is relatively thick. As such, the hole 39 is blocked by the insulator 14. However, holes 38 and 40 are not blocked, so the pin 50/52 is inserted through those holes 38/40 and below the metal connector 18 and top contact 20 of the cutout to keep the cover 32 in place during high winds.

(15) FIG. 8 shows the use of a similar cover 56 over a polymer insulator 66 that is narrower than the porcelain insulator 14 of FIG. 7. Pin 50 or 52 is inserted through holes 39 and 40 since the hole 39 is not blocked by the narrower insulator 66. If the hole 38 is not blocked, a pin 50/52 can instead be inserted through the hole 38. The pins 50/52 prevent the cover 32 being blown off in high winds.

(16) The pin 50/52 can be used with many other types of dielectric covers that are used to protect wildlife from high voltage components. Such other covers include covers that are secured over an insulator supporting a wire, or covers over bushings for transformers, switches, etc.

(17) Instead of the skirts 54 and ribs 56 shown, other types of designs may be used to increase the surface leakage distance along the pin's body.

(18) In the example of FIG. 5, six skirts 54 are shown but any number of skirts can be used, as required.

(19) Similarly, in the example of FIG. 6, fifteen ribs 56 are shown but any number of ribs can be used, as required.

(20) In one example, the body 58/60 of the pin 50/52 has a diameter of about one-quarter inch, and the skirt 54 or rib 56 radially extends about 1/16-⅛ out of the body 58/60.

(21) The body 58/60 may be oval shaped, which means the skirts 54 and ribs 56 are also oval shaped. The holes in the cover 32 may be similarly oval shaped, and the pin 50/52 is oriented so the oval shapes are aligned. This also prevents the pin 50.52 from rotating after being inserted into the hole. The ring 46 is perpendicular to the wide diameter of the oval, so the ring 46 is generally parallel to the ground when the cover 32 and pin 50/52 are properly installed. This is an optimal angle for grasping the ring 46 with a hot stick. The resilient portion 48 of the pin 50/52 aligns with the wide part of the oval and is perpendicular to the ring 46.

(22) Any diameter the skirts 54 or ribs 56 may be adequate, depending on the moisture level. The skirts 54 or ribs 56 can instead take other forms of a plurality of radial portions extending outward from a centerline of the body 58/60 between the resilient portion 48 (the nose) and the grasping ring 46. The radial portions have a diameter that is smaller than the holes in the cover 32.

(23) The pins 50/52 are inserted and removed via a hot stick to allow the cover 32 to be installed or removed while the conductor 16 is energized.

(24) Other embodiments of pins are envisioned. For example, in some uses, the pins do not require the resilient ends to prevent the pins being unintentionally dislodged from the cover. In one embodiment, the pin 50/52 does not need to be pushed all the way through the cover 32, since pushing the pin only partially through the cover 32 will still secure the cover 32 over the cutout.

(25) Having described the invention in detail, those skilled in the art will appreciate that, given the present disclosure, modifications may be made to the invention without departing from the spirit of the inventive concept described herein. Therefore, it is not intended that the scope of the invention be limited to the specific embodiments illustrated and described.