JP3350508B2 - Load-breaking bushing insert, combination of this and connector, and ventilation method between both - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load shedding connector, and more particularly to an improvement of a load shedding connector for preventing a flashover when the load shedding connector is opened and closed (when opened).

[0002]

BACKGROUND OF THE INVENTION Load shedding connectors for use with 15 and 25 KV switchgear are typically used for power cables having one end receiving a power cable and the other end receiving a load shedding bushing insert. Includes elbow connector. The end adapted to receive the bushing insert typically includes an elbow cuff for interference fit with a flange formed on the bushing insert. The interference fit between the elbow cuff and the bushing insert provides a moisture and dust seal therebetween. An indicator band may be installed on a portion of the load shedding bushing insert so that the inspector can visually determine the proper installation of the elbow cuff and bushing insert immediately.

[0003] The elbow cuff forms a cavity that has a volume of air that is exhausted upon insertion of the bushing insert. During the initial operation of the load shedding connector during the removal operation,
The volume of air within the elbow cavity increases, but is blocked by the elbow cuff, resulting in a lower pressure in the cavity. The dielectric strength of the air in the cavity decreases with decreasing air pressure. Although this is a transient condition, it occurs at the critical point of the removal operation and can result in dielectric breakdown of the open interface, resulting in a flashover or ground fault arc.
The occurrence of flashover also depends on other parameters, such as the ambient temperature, the temporal relationship between the physical separation of the connector and the sinusoidal voltage across the load shedding connector.

Another reason for flashover when opening and closing the load shedding connector before the contacts separate is that:
Attributable to reduced dielectric strength of the air along the interface between the bushing insert and the ground elbow of the power cable. As mentioned above, the reduction in air pressure is temporarily created by a sealed cavity between the elbow cuff and the flange of the bushing insert. As the pressure in the cavity decreases, the dielectric strength of the air along the connection interface decreases, which can lead to flashover.

[0005]

Accordingly, it would be advantageous to design a load shedding connector system that includes a power cable elbow and a load shedding bushing insert to reduce or prevent the possibility of flashover when opening and closing the connector. It is.

[0006]

It is an object of the present invention to provide a load shedding connector that prevents flashover from occurring at the interface of the connector when removing under load.

An elbow connector for a power cable and a load shedding bushing insert having a modified interface that is ventilated to prevent a decrease in air pressure during that time and a resulting decrease in air dielectric strength resulting in flashover. Is a further object of the present invention.

An elbow connector for a power cable having an indicator band formed on a bushing insert and vented to prevent a reduction in air pressure therebetween and a resulting decrease in air dielectric strength resulting in flashover. It is yet another object of the present invention to provide a bushing insert with a load shedding.

[0009] It is an object of the present invention to provide an elbow connector for a power cable and a load interrupting bushing insert in which the distance from the elbow electrode in an energized state to the ground electrode of the bushing insert is increased to avoid flashover. It is yet another object of the invention.

It is a further object of the present invention to provide an elbow connector for a power cable having an electrode or probe with a portion of the electrode covered with an insulating material to increase the flashover distance to ground. .

The opening for receiving the bushing insert includes, at its upper end, an insulating material disposed within the conductive insert portion of the elbow connector, thereby increasing the power between the powered electrode and ground. It is yet another object of the present invention to provide a cable elbow connector.

[0012]

According to one aspect of the invention, a load shedding connector assembly includes a power cable elbow having a conductor receiving end and a load shedding bushing insert insertion end and a load shedding bushing insert. Including. The load shedding bushing insert includes an insulated outer housing having an axial bore therethrough, wherein the conductive member is disposed within the axial bore of the outer housing, the outer housing being formed in three sections. The first end section is sized to fit into a well of a universal bushing, the second end section is sized to be inserted into an elbow connector for a power cable, and the third section is closer to the first and second end sections. This is an intermediate section with a large radius. The intermediate section preferably includes a ground conductor and a conductive portion that attaches a transitional shoulder between the second end section and the intermediate section. To prevent pressure drop in the cavity formed between the elbow cuff of the elbow connector and the middle section of the bushing insert, the transition shoulder of the bushing insert should be on the longitudinal side of the middle section of the outer housing. And means for venting the annular top surface of the transitional shoulder portion.

The ventilation means includes at least one ventilation groove formed in a transition shoulder portion of the outer housing, at least one through hole extending from the annular top surface to a vertical side surface, and a circumference formed in the transition shoulder portion. It can be formed in a number of different ways, such as a directional groove, or a plurality of raised ribs circumferentially spaced along a transitional shoulder of the outer housing. In addition, the cavity formed between the elbow cuff and the transitional shoulder of the bushing insert may include an elastomeric flap that fills the cavity therebetween and prevents any pressure drop in the cavity.

According to one aspect of the invention, the venting means is included in an elbow pedestal indicator band formed in the transition shoulder of the bushing insert. With the elbow properly mated to the load shedding bushing, this indicator band is hidden under the elbow cuff and is invisible. The transitional shoulder portion is formed in a step or depression, and a prominently colored or extruded indicator band is located within the step or depression. Thus, while this band demonstrates proper attachment of the elbow cuff and bushing insert, it also provides ventilation to the cavity formed therebetween.
Serving for one purpose.

Alternatively, the combination of the power cable elbow and the load shedding bushing insert may include means for increasing the distance from the energized electrode to ground to prevent flashover during the removal operation. The elbow connector for a power cable includes an end for receiving a conductor, an end for receiving a load shedding bushing insert, and a conductive member extending from the end for receiving the cable to the end for receiving the bushing insert. The end for receiving the bushing insert includes an open end portion surrounded by an elbow cuff. The load shedding bushing insert includes an insulating outer housing having an axial bore therethrough and a conductive member disposed within the axial bore. The outer housing includes a power cable / elbow insertion end and an intermediate section having a radius larger than the power cable / elbow insertion end of the outer housing. The outer housing includes a transitional shoulder between the intermediate section and the elbow insertion end to provide an interference fit sealing relationship with the elbow cuff when the bushing insert is inserted into the power cable elbow. The transitional shoulder of the bushing insert is located between the elbow cuff and the transitional shoulder of the bushing insert during removal to prevent flashover due to reduced pressure in the cavity and reduced dielectric strength of its air. A vent according to the present invention is included to provide fluid communication between the defined cavity and the mating elbow cuff and location outside the transitional shoulder.

The intermediate section of the bushing insert includes a conductive portion having at least one ground connection terminal that attaches to a ground conductor. In accordance with the present invention, the conductive portion partially coats the insulating material between the ground connection terminal and the transition shoulder, thereby increasing the distance that the arc from the powered electrode must travel to ground. Alternatively, the power cable elbow includes probes or electrodes that make electrical contact with the conductive members of the bushing insert during assembly. The probe includes a portion having insulating material surrounding the probe that extends into the bushing insert when the power cable elbow and the bushing insert are assembled. Thus, the distance that the arc must travel from the energized electrode to ground is increased by the length of the insulating material surrounding the probe. In addition, the power cable elbow includes a conductive insert at the top of the space that receives the bushing insert. The conductive insert may include an insulating material in an upper portion of the space for receiving the bushing insert to increase the distance between the powered electrode and ground.

The preferred form of the load shedding connector, including the power cable elbow connector and the load shedding bushing insert and the pedestal indicator band, and other embodiments, objects, features and advantages of the present invention are illustrated by illustrative embodiments. The detailed description becomes apparent when read in conjunction with the accompanying drawings.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, a prior art load shedding connector is illustrated. FIG. 1 shows the power cable elbow connector 2 coupled to a load shedding bushing insert 4 housed in a well 6 of a universal bushing. The bushing well 6 is mounted on the faceplate 8 of the device. The power cable elbow connector 2 includes a first end for receiving the load shedding bushing insert 4 and having a flange or elbow cuff 10 surrounding an open receiving end. The elbow connector for the power cable also includes an open eye 12 for thermal stick operation and a test point 14 which is a capacitive coupling terminal for use with a suitable voltage sensing device. The power cable receiving end 16 is provided at the end opposite to the power cable elbow connector. A conductive member extends from the power cable receiving end to the bushing insert receiving end for connection to the probe insertion end 36 of the bushing insert.

Referring to FIGS. 1 and 2, the load shedding bushing insert includes an intermediate section 18 having a larger dimension than the remainder of the bushing insert.
The intermediate section 18 includes an intermediate section and an elbow for a power cable.
It includes a transitional shoulder portion 20 between the upper section 22 inserted into the connector 2. As shown more clearly in FIG. 2, which is an enlarged cross-sectional view of the interface of the connector, the elbow cuff 10 and the side of the intermediate section of the bushing insert
A tight fit between them seals off moisture and dust. As the power cable elbow connector initially moves away from the bushing insert during the unmating operation, the cavity 24 defined by the elbow cuff 10 and the transitional shoulder portion 20 of the bushing insert increases in volume. The seal between the elbow cuff and the transitional portion of the bushing insert causes a pressure drop in the cavity 24. The dielectric strength of the air in the cavity 24 decreases with decreasing pressure. Although this is a transient condition, such a decrease in dielectric strength occurs at critical points of operation, resulting in dielectric breakdown at the open interface between the power cable elbow connector and the bushing insert. Can occur, causing a flashover, or arc to ground. The occurrence of such flashover is also related to uncontrollable parameters such as ambient temperature, the temporal relationship between the physical separation of the connectors and the voltage.

In order to prevent flashover caused by a decrease in air dielectric strength when the power cable elbow connector is disconnected from the bushing insert under a load, the present invention provides an intermediate section between the elbow cuff and the bushing insert. Or to increase the distance between the energized electrode and ground, thereby providing a structure that compensates for the reduced dielectric strength of the air due to the pressure drop.

Referring now to FIGS. 3-8, the present invention provides a means for venting the cavity defined by the interface between the power cable elbow cuff 10 and the bushing insert. In particular, when the power cable elbow connector is fully installed on the bushing insert, the elbow cuff provides a venting means to provide a seal with the intermediate section 18 of the bushing insert. Removal and separation of the power cable elbow connector from the bushing insert exposes the venting means and vents the cavity to equalize the pressure of the cavity to the surrounding air pressure.

Referring specifically to FIG. 3, which is a partial cross-sectional view showing the interface between the elbow cuff 10 and the bushing insert, the transitional shoulder portion 20 of the bushing insert includes:
It is shown to include at least one vent groove 26 with an angled cut-out in the middle section of the bushing insert. As the elbow cuff 10 separates from the bushing insert during removal, the lower portion of the vent groove 26 is exposed to atmospheric pressure, creating fluid communication with the cavity 24 and reducing the pressure in the cavity to the atmospheric pressure surrounding the connector assembly. And equivalent. Therefore, the initial sealing of moisture and dust between the elbow cuff and the bushing insert is maintained, and when the power cable elbow connector 2 is removed from the bushing insert 4, the cavity formed therebetween is ventilated.

An alternative method of venting the cavity 24 is shown in FIGS. 4, 5 and 6, and is also a partial cross-sectional view of the interface between the elbow cuff 10 and the bushing insert.
In particular, FIG. 4 shows the transitional shoulder of the bushing insert stepped to provide a circumferential groove 28 along the top of the bushing insert. When removed, the circumferential groove 28 opens the cavity to external atmospheric pressure and prevents a reduction in the dielectric strength of the air in the cavity.

FIG. 5 shows a further alternative embodiment in which the bushing insert includes at least one rib 30 substantially formed in the transitional shoulder portion 20 of the bushing insert. In particular, the ribs 30, when removed, cause the elbow cuff 10 to expand radially outward, thereby causing the cavity 2
4 in fluid communication with the atmosphere surrounding the connector assembly. A further alternative embodiment of venting the cavity formed between the elbow cuff and the bushing insert, shown in FIG. 6, is at least one vent from the side of the bushing insert to the transitional shoulder annular top surface. Of the through hole 32. In the removal operation, the cavity 2
4 can vent to the outside air, preventing pressure drop in the cavity.

Each of the above methods can deform the load shedding bushing insert and vent the cavity formed between the bushing insert and the elbow cuff. Alternatively, elbow connector 2 for power cable
May be modified to prevent a decrease in air pressure in the cavity. It is advantageous to maintain a moisture and dust tight seal at the interface between the elbow cuff and the bushing insert. Thus, removing the elbow cuff prevents pressure buildup in the cavity, but also allows moisture and dust to build up at the base of the interface, which can lead to a flashover condition. As shown in FIG. 6, a feasible solution is to delete the through hole 32 of the bushing insert and place an expanding elastomeric material 34 in the cavity, effectively eliminating the cavity during the removal operation. Of course, the elastomeric material is designed to fill the cavity but not apply undue force to the interface of the bushing insert so that the elbow connector of the power cable does not reverse the interface during assembly.

Referring to FIGS. 7 and 8, in another embodiment of the present invention, the venting means comprises a bushing insert 18.
Is provided on an elbow pedestal indicator band 70 formed in the transitional shoulder portion 20 of FIG. This indicator
The band 70 is an annular ring and is red, yellow, or a vivid color such as those prominent to the color of the bushing insert 18. The indicator band 70 can be molded or extruded from a suitable rubber or plastic material. The transitional shoulder portion 20 is formed with a step or depression 72,
An indicator band is located in the step or recess. When the load shedding connector is properly installed, the band is fitted with the transitional bushing insert 18 so that the elbow cuff 10 completely obscures the band 70 and visually indicates that it is properly installed. It is seated on the shoulder portion 20. Load shedding bushing 18
If is not fully inserted inside the elbow cuff 10, the bright colors of the indicator band 70 are visible, alerting the user to improper installation. An elbow pedestal indicator band of this type is disclosed in U.S. Pat.
No. 95,180. However, the indicator band according to the present invention includes ventilation means such as a plurality of ventilation grooves 74 formed at intervals around the band 70. Similar to the venting means described above, when the elbow cuff 10 separates from the bushing insert 18 during removal, the lower portion of the vent groove 74 is exposed to atmospheric pressure, creating fluid communication with the cavity 24, The pressure in the cavity is equal to the atmospheric pressure surrounding the connector assembly. Although the indicator band 70 of FIGS. 7 and 8 is shown with a vent groove 74, any other vent means described above with respect to the transitional shoulder, ie, a circular groove, raised ribs, ventilation through holes, or A flap of elastomeric material may also be placed on the indicator band 70.

As described above, the elbow of the power cable
Yet another alternative to preventing flashover when removing the connector from the load shedding bushing requires increasing the distance between the powered electrode and the ground of the bushing insert. Referring to FIG. 9, which is a cross-sectional view of the load shedding bushing insert 4 and the well 6 of the universal bushing, the grounding distance from the probe insertion end 36 to the grounding electrode 38 is such that an insulating layer is formed around most of the grounding electrode 38. It is lengthened by adding 40 layers. The load shedding bushing insert 4 includes a current path 42 and a flange connecting the bushing insert to the bushing well 6. In prior art devices, the ground electrode 38 extends over substantially the entire length of the intermediate section 18 of the bushing insert. Therefore, the distance from the ground electrode of the insert to the energized probe electrode basically includes the distance from the transitional shoulder of the bushing insert to the probe insertion end.

According to the present invention, most of the ground electrode is
, The flashover distance from the current-carrying electrode to the ground electrode is increased. Therefore,
The flashover distance increases from the transition shoulder 20 to approximately the ground eye 46 of the ground electrode 38. Grounding eye 46
Makes the installation of the ground conductor convenient. A suitable material for the insulating portion of the load shedding bushing insert is a peroxide curable synthetic rubber known in the art and referred to as an EPEM insulator. In addition, the ground electrode is a molded conductive EP
It may be formed from DM.

Alternatively, the power cable elbow connector 2 can be modified from prior art elbows to increase the distance between the powered electrode and ground. FIG.
0 is a cross-sectional view of a modified power cable elbow according to the present invention. The power cable elbow connector 2 includes a conductor receiving end 53 having a conductor 50 therein. The other end of the power cable elbow is the load shedding bushing insert receiving end, which has a probe or powered electrode 52 located in the center opening of the bushing receiving end. Probe 52 is connected to cable 50 via a cable connector. The power cable elbow includes a shield 54 formed from conductive EPDM. Shielding material 5
Inside 4, the power cable elbow comprises an insulating inner housing 56 defining a bushing insert receptacle 51.

In prior art devices, the elbow connector for the power cable includes a conductive insert surrounding the upper portion of the bushing insert receiving space and the connecting portion 62 of the cable. An energized electrode or probe 52 and an elbow cuff 10 located on the bushing insert
In order to increase the distance between the earth located near
The present invention adds an insulating layer that covers a portion of the powered electrode.
In a first embodiment, an insulating portion 60 is provided at the upper end of a bushing insert receptacle within conductive insert 58. The insulating portion 60 extends from the compression lug 62 that receives the cable 50 to a position below a retaining ring 64 that mates with the bushing insert retaining groove to secure the bushing insert connection within the elbow connector of the power cable. Exist. Therefore, in order for flashover to occur, the arc extends over the insulating layer 60 and further extends over the insulating layer 5.
6 must reach the grounding electrode of the bushing insert.

Alternatively, the distance between the energized electrode 52 and the grounding electrode 38 of the bushing insert is further increased by covering a portion of the energized electrode or probe 52 and increasing the flashover distance. be able to. As shown in FIG.
Includes an upper portion having an insulating layer 66 surrounding the upper portion. Thus, for a flashover to occur, the arc first traverses the insulation surrounding the top of electrode 66 and then across the upper insulation portion 60 and insulation material 56 within conductive insert 58 to form a bushing. -It must reach the ground electrode 38 on the insert. Thus, the flashover distance is increased by the distance that the insulating material covers the electrodes, and further by the distance from the top of the bushing insert receptacle to the bottom of the conductive insert, the latter distance being a conductive path in the prior art. Of course, the elbow connector of the power cable can be deformed by the probe insulator 66, the insulating material 60 in the conductive insert, or a combination of both, to increase the distance between the powered electrode and ground. . By increasing the flashover distance, the dielectric strength of the air around the interface decreases, so that the air pressure around the sealing interface between the elbow connector 2 of the power cable and the load shedding bushing insert 4 increases. The likelihood of a flashover occurring due to a drop is greatly reduced.

The load shedding connector assembly of the present invention, including a modified bushing insert and a modified elbow connector for a power cable, greatly reduces the likelihood of flashover occurring during a removal operation. Flashover provides ventilation at the interference interface between the bushing insert and the elbow connector for power cables, or increases the flashover distance that the arc must travel to ground to prevent flashover Is prevented. The flashover distance can be increased by providing additional insulating material in the powered electrodes, in the conductive insert, or both.

While illustrative embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to these exact embodiments, and departs from the scope or spirit of the present invention. Without departing, it will be appreciated by those skilled in the art that various other changes and modifications can be made.

[Brief description of the drawings]

FIG. 1 is a side view of a well of a prior art load shedding connector: a power cable elbow, a load shedding bushing insert and a universal bushing.

FIG. 2 is an enlarged cross-sectional view of the mating interface between the prior art power cable elbow and the load shedding bushing insert shown in FIG.

FIG. 3 shows a modified load interrupting bushing insert including a ventilation groove formed according to the present invention and an elbow for a power cable.
It is an expanded sectional view of the mating boundary surface between a connector.

FIG. 4 is an enlarged cross-sectional view of the mating interface between a deformed load shedding bushing insert including a circumferential ventilation groove formed in accordance with the present invention and an elbow connector for a power cable.

FIG. 5 is an enlarged cross-sectional view of a mating interface between a deformed load shedding bushing insert including raised ribs formed according to the present invention and an elbow connector for a power cable.

FIG. 6 is an enlarged cross-sectional view of the mating interface between a deformed load shedding bushing insert including a through hole vent or an elastomeric flap formed according to the present invention and an elbow connector for a power cable.

FIG. 7 is an enlarged cross-sectional view of a mating interface between a power cable elbow connector formed according to the present invention and a modified load shedding bushing insert including a pedestal indicator band having a vent groove.

FIG. 8 is a top view of a pedestal indicator band having a vent groove formed in accordance with the present invention.

FIG. 9 is an enlarged cross-sectional view of a well of a load shedding bushing insert and a universal bushing including an insulating material covering most of a ground electrode formed according to the present invention.

FIG. 10 is a cross-sectional view of an elbow connector for a modified power cable including an electrode having an insulating material and an insulating coating in a conductive insert in an upper portion of a space that receives a load shedding bushing.

[Explanation of symbols]

 2 Elbow connector for power cable 4 Load interrupting bushing insert 6 Well cylinder 8 Face plate 10 Elbow cuff 12 Open eye 14 Test point 16 Power cable receiving end 18 Intermediate section 20 Transient shoulder 22 Upper section 24 Cavity 26 Vent groove 28 Circle Circumferential groove 30 Rib 32 Through hole 36 Probe insertion end 38 Ground electrode 40 Insulating layer 42 Current path 46 Grounding eye 50 Conductor 51 Conductor receiving end 52 Probe 54 Shielding material 56 Housing 58 Conductive insert 60 Insulating layer 62 Connection portion 64 Insulation layer 66 Insulation layer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-11-150851 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01R 13/00 H02G 15/06 H02G 15 / 08

Claims (21)

(57) [Claims] 1. A load interrupting bushing insert, wherein the outer housing includes three sections, a first end section is sized to be sealed within a well of the bushing, and a second end section is an elbow for a power cable. The intermediate section is sized to be inserted into the connector, the intermediate section is larger in radius than the first and second end sections, and the outer housing has a transitional shoulder between the second end section and the intermediate section An insulating outer casing having an axial bore, a conductive member disposed in the axial bore of the casing, and a band formed of a material having a color different from that of the outer casing, An indicator band provided on the transition shoulder portion of the housing, the band further including a longitudinal side of the middle section of the housing and at least one vent for venting the annular top surface of the transition shoulder portion. Equipped load shedding insert load shedding Bushing insert. 2. The load shedding bushing insert according to claim 1, wherein the at least one vent includes at least one vent groove formed in the indicator band. 3. The load shedding bushing according to claim 1, wherein the at least one vent includes at least one through hole extending from the annular top surface of the transition shoulder to the longitudinal side of the middle section of the housing. insert. 4. The load shedding bushing insert according to claim 1, wherein the at least one vent includes a circumferential direction formed in the indicator band. 5. The load shedding bushing insert of claim 1, wherein the at least one vent includes a plurality of raised ribs circumferentially spaced along an outer surface of the indicator band. 6. The load shedding bushing insert according to claim 1, wherein the indicator band is located within the recess formed with the transitional shoulder. 7. A combination of an elbow connector for a power cable, a load interrupting bushing insert, and an indicator band, wherein the elbow connector for a power cable includes a conductor receiving end and a load interrupting bushing insert receiving end. The connector further includes a conductive member extending from the cable receiving end to the bushing insert receiving end, wherein the bushing insert receiving end includes an open end portion surrounded by an elbow cuff. An insulating outer housing having a penetrating axial bore; and a conductive member disposed in the axial bore, wherein the outer housing has a power cable
An elbow insertion end and an intermediate section radially larger than the power cable / elbow insertion end of the outer housing, the outer housing having a transitional shoulder between the intermediate section and the elbow insertion end. Providing an interference fit sealing relationship with the elbow cuff upon insertion of the bushing insert into the power cable elbow connector, wherein the indicator band is provided on a transitional shoulder portion of the outer housing of the bushing insert. The band is formed of a material that is a different color than the color of the outer housing, and the cavity defined between the elbow cuff and the transitional shoulder of the insert upon removal has a mating elbow. A vent that provides fluid communication between the cuff and a location outside the transitional shoulder portion of the insert. 8. The indicator band, when the insertion end of the load shedding bushing insert is fully inserted into the bushing insert receiving end of the power cable elbow connector, the elbow cuff of the power cable elbow connector. The combination of claim 7, wherein the combination is visually obscured by. 9. The combination according to claim 7, wherein the vent comprises at least one vent groove formed in the indicator band. 10. The vent band includes at least one through hole formed in the indicator band from an annular top surface of the band to a longitudinal side of the band.
Combination described in. 11. The combination according to claim 7, wherein the vent comprises a circumferentially formed groove in the indicator band. 12. The combination of claim 7, wherein the vent comprises a plurality of raised ribs circumferentially spaced along an outer surface of the indicator band. 13. A method for venting a space formed between a power cable elbow connector and a load shedding bushing insert of a load shedding connector assembly, such as being sealed within a bushing well. A first end section having a dimension, a second end section having a dimension inserted into a power cable elbow connector, an intermediate section having a radius larger than the first end section and the second end section, and a second end section and an intermediate section. Providing a load shedding bushing insert including a transitional shoulder disposed between the transitional shoulder and a vent in the transitional shoulder between the top surface of the transitional shoulder and the longitudinal side of the intermediate section. And forming a space between the power cable elbow connector and the load shedding bushing insert into a vent to substantially prevent the creation of a low pressure dielectric space. Disconnecting the power cable elbow and the load shedding bushing insert so that it is ventilated. 14. The method for venting according to claim 13, wherein the vent comprises at least one vent groove formed in a transition shoulder of the load shedding bushing insert. 15. The vent according to claim 1, wherein the vent comprises at least one through hole extending from the annular top surface to the longitudinal side.
3. The method for aerating according to 3. 16. The method for venting according to claim 13, wherein the vent comprises a circumferential groove formed in the transition shoulder of the load shedding bushing insert. 17. The method for venting according to claim 13, wherein the vent comprises a plurality of raised ribs circumferentially spaced along a transitional shoulder of the load shedding bushing insert. 18. The method according to claim 18, further comprising providing an indicator band disposed on the transitional shoulder, wherein the band includes a load shedding bushing insert and a power cable.
Providing a visual indication of the proper connection with the elbow,
14. The method for venting according to claim 13, wherein the method is formed of a material that is a different color than the color of the load shedding bushing insert. 19. The method for venting according to claim 18, further comprising forming a recess in the transitional shoulder portion to place the indicator band. 20. The indicator band is visually obscured by the power cable elbow connector when the second end section of the load shedding bushing insert is fully inserted into the power cable elbow connector.
The method for venting according to claim 18. 21. The method for venting according to claim 18, wherein a vent is formed in the indicator band.