US 11,658,467 B2
Busbar connecting device
Shintaro Yamada, Tokyo (JP); Katsushi Nakada, Tokyo (JP); Katsuki Hotta, Tokyo (JP); Yasutomo Otake, Tokyo (JP); Takao Tsurimoto, Tokyo (JP); and Shintaro Kuroaki, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/293,497
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Dec. 26, 2018, PCT No. PCT/JP2018/047718
§ 371(c)(1), (2) Date May 13, 2021,
PCT Pub. No. WO2020/136737, PCT Pub. Date Jul. 2, 2020.
Prior Publication US 2022/0006270 A1, Jan. 6, 2022
Int. Cl. H02B 13/00 (2006.01); H02G 5/08 (2006.01); H02B 1/20 (2006.01); H02B 13/02 (2006.01)
CPC H02B 1/20 (2013.01) [H02B 13/005 (2013.01); H02B 13/02 (2013.01); H02G 5/08 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A busbar connecting device comprising:
a connection portion in which a busbar conductor and a current conductor of a bushing are connected;
an insulation busbar connector covering the connection portion, the insulation busbar connector having a work hole extending into the insulation busbar connector from an outer opening of the work hole of the insulation busbar connector, the work hole communicating with the connection portion; and
an insulating plug inserted into the work hole from the outer opening of the insulation busbar connector and configured to seal the outer opening of the work hole when inserted, the insulating plug has an external truncated cone shape defining an external shape, the external truncated cone shape expands toward the outer opening of the insulation busbar connector when the insulation plug is inserted into the work hole, the external truncated cone shape of the insulating plug corresponding to an internal shape of the work hole,
wherein the internal shape of the work hole includes:
a diameter at a deeper part of the work hole relative to the outer opening, the diameter defining a virtual cone extending virtually from the diameter and expanding toward the outer opening of the work hole,
a truncated portion at a shallower part of the work hole relative to the outer opening and expanding toward the outer opening, the truncated portion disposed entirely outside of the virtual cone,
a protrusion portion disposed at an intermediate part of the work hole and located between the shallower and deeper parts of the work hole, the protrusion portion expanding toward the outer opening and disposed entirely inside of the virtual cone,
a narrowing portion transitioning between the truncated portion and the protrusion portion, the narrowing portion expanding toward the outer opening, and
a widening portion transitioning between the protrusion portion and the diameter, the widening portion reducing toward the outer opening,
wherein the truncated portion, the narrowing portion, the protrusion portion, the widening portion and the diameter are substantially coaxial with each other,
wherein a surface pressure between a surface of the protrusion portion and a first portion of an external surface of the insulating plug that mates with the protrusion portion is greater than a surface pressure between a surface of the truncated portion and a second portion of the external surface of the insulating plug that mates with the truncated portion.