SINGLE PHASE UNDERGROUND FUSED TAP

Abstract

A fused tap for an elbow connector that properly insulates and houses an interruption device or fuse to provide protection on underground distribution power lines. The interruption device is replaceable without the need of replacing the entire assembly. The fused tap provides flexibility in installation for existing and new underground distribution lines and/or feeders.

Claims

1. An apparatus comprising: a first metal conductor casing having a threaded first probe end; a second metal conductor casing having a threaded second probe end; a fuse having a first conductive end and a second conductive end each comprising threaded terminals; the threaded first probe end configured to electrically connect to the first conductive end by screwing into the threaded terminal of the first conductive end; and the threaded second probe end configured to electrically connect to the second conductive end by screwing into the threaded terminal of the second conductive end.

2. The apparatus of claim 1, further comprising a parking bracket releasably secured to the apparatus by a nut and bolt assembly pressing against the outer surface of the apparatus to releasably secure the apparatus in a fixed position.

3. The apparatus of claim 1, further comprising guides attached to the front of a contact assembly of the second metal conductor casing for positioning an external bushing probe into electrical contact with a contact assembly.

4. The apparatus of claim 1, further comprising a pulling eye to allow insertion or removal of an external bushing probe.

5. The apparatus of claim 1, further comprising an external bushing removably connected to a locking groove to provide electrical connections to new or existing lines.

6. The apparatus of claim 1, further comprising a voltage test plug for testing the presence of voltage at a capacitive voltage tap.

7. A method comprising: providing a first metal conductor casing having a threaded first probe end; providing a second metal conductor casing having a threaded second probe end; providing a fuse having a first conductive end and a second conductive end each comprising threaded terminals; electrically connecting the first conductive end of the fuse to the first threaded probe end by screwing the first threaded probe end into the threaded terminal of the first conductive end; and electrically connecting the second conductive end of the fuse to the second threaded probe end by screwing the second threaded probe end into the threaded terminal of the second conductive end.

8. The method of claim 7, further comprising the step of releasably securing the apparatus in a fixed position relative to a parking bracket by pressing a nut and bolt against the outer surface of the apparatus.

9. The method of claim 7, further comprising the step of positioning an external bushing probe into electrical contact with a contact assembly of the second metal conductor casing disposed by inserting the external bushing probe into contact with guides attached to the front of the contact assembly.

10. The method of claim 7, further comprising the step of affixing a pulling eye to allow insertion or removal of an external bushing probe.

11. The method of claim 7, further comprising the step of removably connecting an external bushing to a locking groove to provide electrical connections to new or existing lines.

12. The method of claim 7, further comprising the step of testing for the presence of voltage at a capacitive voltage tap with a voltage test plug.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG. 1 is a cross-sectional view of a fused tap according to the present invention.

[0009] FIG. 2 is a perspective view of a prototypical embodiment of a fused tap.

[0010] FIG. 3 is a cross-sectional view of a disassembled fused tap according to FIG. 1 of the present invention.

[0011] FIG. 4 is a perspective view of a disassembled fused tap according to FIG. 2 of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The above and other capabilities, aspects, and advantages of the invention will be discussed in the detailed description below. The detailed descriptions are to be considered in conjunction with the accompanying drawings in which identical reference characters designate like elements throughout the views.

[0013] Shown in FIG. 1 is a fused tap 1 which provides connections to equipment using a female elbow interface 20 and a male elbow interface 19. The fused tap provides connection between two apparatus bushings and adds a protective fuse 11 between the two. Not having to terminate these connections allows for quick and safe installation that can be either a temporary or long-term installation.

[0014] This fused tap 1 design comprises a housing defined by a molded rubber sleeve. The housing can be split into two parts by pulling apart the connection between male elbow interface 19 and female elbow interface 20 at the interface of the respective tube ends 18 in order to replace the fuse 11. Once the fuse 11 has been replaced the housing is secured with an external clamp 25.

[0015] Connections to the fuse 11 are made on either end through the threaded terminals 6. On the female elbow interface 20 the fuse 11 makes an electrical connection through the threaded conductor 5 which is connected to the probe 3 and the probe tip 2. The probe tip 2 acts as a guide when inserting the fused tap 1 for installation. An insulating body 4 surrounds the threaded conductor 5 and the fuse's threaded terminal 6. The fuse 11 is contained within the housing of the sleeve and on the male elbow interface 19 connects to a threaded nut conductor 13 that screws into the fuse 11 threaded terminal 6. The threaded nut conductor 13 is mechanically housed within a metal conductor casing 17 to provide an electrical connection between the threaded nut conductor 13 and an external bushing probe that inserts into the probe interface 15. The metal conductor casing 17 is designed with a guide gap 16 that aids when screwing the threaded nut connector 13 to the fuse 11 threaded terminal 6. When an external bushing probe is inserted into the probe interface 15 electrical contact is made between the external bushing probe and the contact assembly 14. The external bushing probe assembly is positioned into place by guides 12 attached to the front of the contact assembly 14.

[0016] An external bushing is plugged into the male elbow interface 19 to provide connections to new or existing underground or above-ground elbow connections. The locking groove 21 grips the external bushing probe to keep the external bushing probe in place. Before plugging in the external bushing probe, the fused tap 1 must be secured using the parking bracket 22. Once the fused tap 1 is in the parking bracket 22, the bolt 24 is used to tighten the nut 23 and provide support by a strong force pressing against the outer surface of the fused tap 1. The pulling eye 7 on the fused tap 1 allows assembly to, and removal from, the external bushing probe with the aid of a live line tool or, hot stick.

[0017] The fused tap 1 has several features to improve personnel safety when the fused tap 1 has been energized. The voltage test plug 9 can be removed to test for the presence of voltage at the capacitive voltage tap 10. The fused tap 1 can be grounded at the two grounding eye 8 locations.

[0018] In a preferred method of making and using the present invention, FIGS. 3 and 4 show the internal and external features of the disassembled parts of a fused tap 1. The user inserts one threaded terminal 6 of the fuse 11 into female elbow interface 20 and screws the threaded conductor 5 of probe 3 into threaded terminal 6 creating an electrical connection between the fuse 11 and probe 3. The user inserts the other threaded terminal 6 of the fuse 11 into male elbow interface 19 and screws the threaded nut conductor 13 into threaded terminal 6 creating an electrical connection between the fuse 11 and threaded nut conductor 13. The molded rubber sleeve housing of male elbow interface 19 is inserted into female elbow interface 20 creating a mating between the two at tube ends 18. The connection is secured by external clamp 25.

[0019] The fused tap 1 is secured using the parking bracket 22. Once the fused tap 1 is in the parking bracket 22, the bolt 24 is used to tighten the nut 23 and provide support by a strong force pressing against the outer surface of the fused tap 1. An external bushing probe is then inserted into the probe interface 15 to provide connections to new or existing underground or above-ground elbow connections. When an external bushing probe is inserted into the probe interface 15 electrical contact is made between the external bushing probe and the contact assembly 14. The external bushing probe assembly is positioned into place by guides 12 attached to the front of the contact assembly 14. The locking groove 21 grips the external bushing probe to keep the external bushing probe in place. The pulling eye 7 on the fused tap 1 allows assembly to, and removal from, the external bushing probe with the aid of a live line tool or, hot stick.

[0020] The fused tap 1 is energized to complete the installation. As a safety measure, the voltage test plug 9 can be removed to test for the presence of voltage at the capacitive voltage tap 10. The fused tap 1 is grounded at the two grounding eye 8 locations to de-energize the fused tap 1 if the parts need to be disassembled or a new fuse replaced into the assembly.