Bus bar connection device and switchgear including the same

Patent metadata

Field	Value
Publication number	US-9906008-B2
Application number	US-201415037297-A
Country	US
Kind code	B2
Filing date	Oct 6, 2014
Priority date	Nov 19, 2013
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

A bus bar connection device for a switchgear has a first bushing with an internal stem conductor whose end is a first connection surface at a nose of the bushing. The bus bar connection device has a second bushing with an internal stem conductor whose end is a second connection surface at a nose of the bushing. The first connection surface of the first bushing is placed opposite the second connection surface of the second bushing, the axis of the first bushing being identical to the axis of the second bushing. A connection element electrically connects the first connection surface with the second connection surface. A cylindrical insulation adapter surrounds the nose of the first bushing, the nose of the second bushing, and the connection element as one.

First claim

What is claimed is:

1. A bus bar connection device comprising:
a first bushing having a first connection surface that is an end of an internal stem conductor of the first bushing stuck out of a nose of the first bushing;
a second bushing having a second connection surface that is an end of an internal stem conductor of the second bushing stuck out of a nose of the second bushing;
a connection element to electrically connect the first connection surface with the second connection surface;
the first bushing having a same axis as the second bushing;
the first connection surface of the first bushing being placed opposite the second connection surface of the second bushing;
a tubular shaped insulation adapter with a cavity inside to surround the nose of the first bushing, the nose of the second bushing, and the connection element as one;
the tubular-shaped insulation adapter having its narrowest inner diameter smaller than an outer diameter of the connection element;
the tubular-shaped insulation adapter having a broaden-radius encircling channel at an inner surface of the tubular-shaped insulation adapter;
a width of the broaden-radius encircling channel being sufficient to cover the connection element and portions of the first and second bushings; and
a surface of the broaden-radius encircling channel being a conductive layer, the conductive layer covering the connector element and the portions of the first and second bushings.

2. The adapter set forth in claim 1 , wherein
a bank of the encircling channel being pushed toward an end of the adapter by an edge of the connection element.

3. The bus bar connection device set forth in claim 1 , wherein
the nose of the first bushing protrudes toward the opposing second bushing from a mounting plane of the first bushing, and
the nose of the second bushing protrudes toward the opposing first bushing from a mounting plane of the second bushing.

4. The bus bar connection device set forth in claim 1 , wherein
the connection element is fixed to both of the first connection surface and the second connection surface to keep an electrical connection.

5. The bus bar connection device set forth in claim 1 , wherein
sliding contact to interconnect the internal stem conductor of the first bushing with the internal stem conductor of the second bushing is limited to only one portion in the connection element.

6. The bus bar connection device set forth in claim 1 , wherein the connection element includes a combination of a cup-shaped socket conductor and a bar-shaped plug conductor, the bar-shaped plug conductor being slidably fitted into the cup-shaped socket conductor.

7. The bus bar connection device set forth in claim 1 , wherein
the connection element to interconnect the first connection surface with the second connection surface is a combination of a first bar-shaped conductor provided on the first connection surface, a second bar-shaped conductor provided on the second connection surface, and finger-shaped individual sliding contacts making sliding contact over sides of the first and the second bar-shaped conductors.

8. A switchgear comprising:
the bus bar connection device set forth in claim 1 to connect neighboring switchgear units together.

9. The switchgear set forth in claim 8 , wherein
a housing of each of the switchgear units has a narrowed part compared to another part of the housing so that an interconnection space is generated between the neighboring switchgear units to place the bus bar connection device in the interconnection space.

10. The switchgear set forth in claim 9 , wherein
the housing of each of the switchgear units is a pressurized tank with an insulation gas therein.

11. The switchgear set forth in claim 10 , wherein
the interconnection space is a plurality of interconnection spaces, each of the neighboring switchgear units have upper and lower pressurized tank segments, the bus bar connection devices being placed at positions from a front to a rear in a respective one of the interconnection spaces between the upper and lower pressurized tank segments.

12. The switchgear set forth in claim 9 , wherein
the bus bar connection device and a current transformer are placed in the interconnection space.

13. The switchgear set forth in claim 8 , wherein
a housing of at least one of the switchgear units is divided into segments to have an interconnection space among the segments, the bus bar connection device being placed in the interconnection space.

14. The switchgear set forth in claim 8 , wherein
the bus bar connection device is a plurality of bus bar connection devices, the plurality of bus bar connection devices are arranged at positions going from a front to a rear, each of the bus bar connection devices being oriented to connect a switchgear unit of the switchgear units with a neighboring switchgear unit of the switchgear units in a same row.

15. The switchgear set forth in claim 8 , wherein
the bus bar connection device is a plurality of the bus bar connection devices, a plurality of three phase bus sets are placed at positions going from a front to a rear, each of the three phase bus sets including three of the bus bar connection devices which constitute one of the three phase bus sets.

16. The switchgear set forth in claim 15 , wherein
the bus bar connection devices for the plurality of three phase bus sets are placed set by set along a line going from the front to the rear, each of the three phase bus sets being placed in the line offset from a neighboring set of the three phase bus sets.

Assignees

• Mitsubishi Electric Corp

Inventors

• Yoshida Tadahiro
• Inoue Naoaki
• Otsubo Takatoshi

Classifications

• H02G5/007 Primary

  Butt joining of bus-bars by means of a common bolt, e.g. splice joint (electrically conductive connections characterised by contacting members H01R4/58) · CPC title

• H01R13/53

  Bases or cases for heavy duty; Bases or cases {for high voltage} with means for preventing corona or arcing · CPC title

• H02B1/22

  Layouts for duplicate bus-bar selection · CPC title

• H02B13/005 Primary

  Electrical connection between switchgear cells · CPC title

• H02B13/035

  Gas-insulated switchgear · CPC title