JP6701141B2 - Gas insulated bus - Google Patents

Description

  The present invention relates to a gas-insulated busbar in which a conductor penetrates through a bellows in which an insulating gas is sealed.

  Gas insulating devices having conductors housed in a metal case filled with insulating gas are connected by gas insulating buses. The gas-insulated bus bar has a hygroscopic agent that absorbs moisture in the insulating gas installed in a cylindrical bellows. It is necessary to provide a hand hole in the gas-insulated bus bar so that the hygroscopic agent can be replaced during the periodic inspection of the gas-insulated bus bar. Patent Document 1 discloses a gas-insulated bus bar having a flange provided with a handhole penetrating in a radial direction of a bellows.

Japanese Utility Model Publication No. 63-160012

  In the invention disclosed in Patent Document 1, since the flange is provided with a hand hole penetrating in the radial direction of the bellows, the axial dimension of the flange becomes large and the size of the gas-insulated bus bar ends up increasing.

  The present invention has been made in view of the above, and an object of the present invention is to obtain a gas-insulated bus bar that is downsized.

  In order to solve the above-mentioned problems and achieve the object, the present invention has a cylindrical first bellows and an annular shape, is connected to both ends of the first bellows, and projects toward the central axis side of the first bellows. A pair of flanges and a conductor that penetrates the first bellows and the pair of flanges are provided. One of the flanges is formed with a hand hole penetrating in the axial direction of the first bellows, and a detachable lid for closing the hand hole is attached.

  According to the present invention, it is possible to obtain a gas-insulated bus bar that is downsized.

Sectional drawing along the axial direction of the gas-insulated bus bar according to Embodiment 1 of the present invention. Sectional drawing perpendicular to the axial direction of the gas-insulated bus bar according to Embodiment 1. Sectional drawing along the axial direction when the gas-insulated bus bar according to Embodiment 1 includes three conductors. Sectional drawing perpendicular|vertical to the axial direction in case the gas-insulated bus bar which concerns on Embodiment 1 is equipped with three conductors. Sectional drawing along the axial direction of the gas-insulated bus bar according to Embodiment 2 of the present invention. Sectional drawing along the axial direction in the case where the gas-insulated bus bar according to Embodiment 2 includes three conductors. Sectional drawing along the axial direction of the gas-insulated bus bar according to Embodiment 3 of the present invention.

  Hereinafter, a gas-insulated bus bar according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1.
FIG. 1 is a sectional view taken along the axial direction of a gas-insulated bus bar according to the first embodiment of the present invention. FIG. 2 is a sectional view perpendicular to the axial direction of the gas-insulated bus bar according to the first embodiment. The cross section shown in FIG. 2 is a cross section of the gas-insulated bus bar 1 along the line II-II in FIG. The axial direction of the gas-insulated busbar 1 is a direction parallel to the central axis O1 of the first bellows 32 and the central axis O2 of the second bellows 31, 33 described later. The gas-insulated busbar 1 includes a cylindrical tank 2 in which an insulating gas is filled and a conductor 5 is arranged. Insulating spacers 4a and 4b are arranged at the ends of the tank 2. An expandable bellows 3 is installed between the insulating spacers 4a and 4b. The bellows 3 may be a bellows type or a slide type.

  The bellows 3 has a cylindrical first bellows 32 having an outer diameter larger than that of the tank 2, and second bellows 31, 33 having a smaller diameter than the first bellows 32. The outer diameter of the second bellows 31, 33 is the same as that of the tank 2. The bellows 3 is a parent and child bellows in which a first bellows 32, which is a parent bellows, is arranged between second bellows 31, 33, which are child bellows. Insulating gas is enclosed in the bellows 3.

  A third flange 34 is installed between the insulating spacer 4 a and the second bellows 31. A first flange 35 is installed between the second bellows 31 and the first bellows 32. A second flange 36 is installed between the first bellows 32 and the second bellows 33. A fourth flange 37 is installed between the second bellows 33 and the insulating spacer 4b. The third flange 34 and the second flange 36 are connected by a first tie rod 38. The first flange 35 and the fourth flange 37 are connected by a second tie rod 39. The first tie rod 38 penetrates the first flange 35, and the first flange 35 is movable along the first tie rod 38. The second tie rod 39 penetrates the second flange 36, and the second flange 36 is movable along the second tie rod 39.

  The first flange 35 and the second flange 36 are annular. The first flange 35 and the second flange 36 are connected to the first bellows 32. Inner peripheral portions of the first flange 35 and the second flange 36 are connected to the second bellows 31, 33. The conductor 5 passes through the first bellows 32, the second bellows 31, 33, the first flange 35, the second flange 36, the third flange 34, and the fourth flange 37.

  The second bellows 31, 33 and the first bellows 32 are installed such that the central axis O2 of the second bellows 31, 33 and the central axis O1 of the first bellows 32 are offset from each other. Specifically, the first bellows 32 and the second bellows 31, 33 are installed such that the second bellows 31, 33 are inscribed in the first bellows 32 when viewed along the axial direction of the first bellows 32. Has been done. The central axis O2 of the second bellows 31, 33 coincides with the central axis O3 of the tank 2. The conductor 5 is arranged on the central axes O2 and O3 of the second bellows 31 and 33 and the tank 2. In the portion where the second bellows 31, 33 are not inscribed in the first bellows 32 when viewed along the axial direction of the first bellows 32, the first flange 35 and the second flange 36 are the central axis of the first bellows 32. Overhangs to the O1 side.

  The second flange 36 is provided with a hand hole 361 that penetrates the first bellows 32 in the axial direction. The handhole 361 is closed by a removable lid 362. A packing (not shown) is installed on the lid 362, and when the lid 362 is attached to the second flange 36, the hand hole 361 is closed in an airtight state.

  The hygroscopic agent 6 is fixed to the inside of the first bellows 32, which is sandwiched between the first flange 35 and the second flange 36, and which extends beyond the outer diameter of the second bellows 31, 33. The moisture absorbent fixing portion 61 is installed. The moisture absorbent fixing portion 61 may be provided on the first flange 35 or the second flange 36.

  In the gas-insulated bus bar 1 according to the first embodiment, the second flange 36 between the first bellows 32 and the second bellows 33 has the handhole 361 in the axial direction of the first bellows 32. It is not necessary to increase the axial dimension of the first flange 35, the second flange 36, the third flange 34, and the fourth flange 37 in order to provide 361. Therefore, the gas-insulated bus bar 1 according to the first embodiment can be downsized.

  In the above description, the number of the conductor 5 is one, but three conductors 5 may be provided. FIG. 3 is a cross-sectional view taken along the axial direction when the gas-insulated bus bar according to Embodiment 1 includes three conductors. FIG. 4 is a cross-sectional view perpendicular to the axial direction when the gas-insulated bus bar according to the first embodiment includes three conductors. The cross section shown in FIG. 4 is a cross section of the gas-insulated bus bar 1 along line IV-IV in FIG. The conductors 5 are arranged at equal distances from the central axis O2 of the second bellows 31, 33 at equal intervals. The gas-insulated bus bar 1 according to Embodiment 1 does not need to increase the axial dimensions of the first flange 35, the second flange 36, the third flange 34, and the fourth flange 37 even when the three conductors 5 are provided. Therefore, miniaturization can be realized.

Embodiment 2.
FIG. 5 is a sectional view taken along the axial direction of the gas-insulated bus bar according to the second embodiment of the present invention. In the gas-insulated bus bar 1 according to the second embodiment, the first bellows 32, which is the parent bellows, is in a state where the central axes O2 of the second bellows 31, 33 that are the child bellows and the central axis O1 of the first bellows 32 coincide with each other. It is installed in. The second flange 36 is provided with hand holes 361a and 361b penetrating in the axial direction of the first bellows 32. The handhole 361a is closed by a removable lid 362a. A packing (not shown) is installed on the lid 362a, and when the lid 362a is attached to the second flange 36, the hand hole 361a is closed in an airtight state. The handhole 361b is closed by a removable lid 362b. A packing (not shown) is installed on the lid 362b, and when the lid 362b is attached to the second flange 36, the handhole 361b is closed in an airtight state.

  The hygroscopic agent 6 is fixed to the inside of the first bellows 32, which is sandwiched between the first flange 35 and the second flange 36, and which extends beyond the outer diameter of the second bellows 31, 33. The moisture absorbent fixing portion 61 is installed.

  In the gas-insulated bus bar 1 according to the second embodiment, since the axial handhole 361 of the first bellows 32 is formed in the second flange 36 between the first bellows 32 and the second bellows 33, the handhole is formed. It is not necessary to increase the axial dimensions of the first flange 35, the second flange 36, the third flange 34, and the fourth flange 37 in order to provide 361a and 361b. Therefore, the gas-insulated bus bar 1 according to the second embodiment can be downsized.

  In the above description, the number of the conductor 5 is one, but three conductors 5 may be provided. FIG. 6 is a cross-sectional view taken along the axial direction when the gas-insulated bus bar according to the second embodiment includes three conductors. The gas-insulated bus bar 1 according to the second embodiment does not need to increase the axial dimension of the first flange 35, the second flange 36, the third flange 34, and the fourth flange 37 even when the three conductors 5 are provided. Therefore, miniaturization can be realized.

Embodiment 3.
FIG. 7 is a cross-sectional view taken along the axial direction of the gas-insulated bus bar according to the third embodiment of the present invention. The gas-insulated bus bar 1 according to the third embodiment does not include the second bellows 31, 33 that are child bellows, the first tie rod 38, and the second tie rod 39. The first flange 35 and the second flange 36 are connected to the tank 2. Other than this, it is the same as the gas-insulated bus bar 1 according to the first embodiment.

  The second flange 36 is provided with a hand hole 361 that penetrates the first bellows 32 in the axial direction. The handhole 361 is closed by a removable lid 362. A packing (not shown) is installed on the lid 362, and when the lid 362 is attached to the second flange 36, the handhole 361 is closed in an airtight state.

  Inside the first bellows 32, the hygroscopic agent is fixed to the portion which is sandwiched between the first flange 35 and the second flange 36 and which is projected outside the outer diameter of the tank 2. The section 61 is installed.

  Since the gas-insulated bus bar 1 according to the third embodiment forms the hand hole 361 in the axial direction of the first bellows 32 on the second flange 36 between the first bellows 32 and the tank 2, the hand hole 361 is formed. There is no need to increase the axial dimensions of the first flange 35 and the second flange 36 to provide them. Therefore, the gas-insulated bus bar 1 according to the third embodiment can be downsized.

  As in the first and second embodiments, even when three conductors 5 are provided, it is not necessary to increase the axial dimensions of the first flange 35 and the second flange 36, so that the gas insulated busbar 1 can be downsized. realizable.

  The configurations described in the above embodiments show an example of the content of the present invention, and can be combined with another known technique, and the configurations of the configurations are possible without departing from the gist of the present invention. It is also possible to omit or change parts.

  1 Gas Insulated Bus Bar, 2 Tank, 3 Bellows, 4a, 4b Insulation Spacer, 5 Conductor, 6 Moisture Absorbent, 31, 33 Second Bellows, 32 First Bellows, 34 Third Flange, 35 First Flange, 36 Second Flange , 37 4th flange, 38 1st tie rod, 39 2nd tie rod, 61 Moisture absorbent fixing part, 361, 361a, 361b Hand hole, 362, 362a, 362b Lid.

Claims (5)

A cylindrical first bellows,
A pair of flanges that are annular and that are connected to both ends of the first bellows and project toward the central axis side of the first bellows;
A conductor that penetrates the first bellows and the pair of flanges;
A gas-insulated bus bar, wherein one of the flanges is formed with a hand hole penetrating in the axial direction of the first bellows, and a detachable lid for closing the hand hole is attached.   The gas-insulated bus bar according to claim 1, wherein a hygroscopic agent fixing portion is provided inside a portion of the first bellows between the pair of flanges.   A pair of second bellows, which are installed on the opposite side of the first bellows with the flange interposed therebetween, are connected to an inner peripheral portion of the flange, and have a cylindrical shape having a diameter smaller than that of the first bellows. The gas-insulated bus bar according to claim 1.   The first bellows are installed with the center axis offset from the pair of second bellows, and when viewed along the axial direction of the first bellows, the pair of second bellows are arranged on the first bellows. The gas-insulated bus bar according to claim 3, which is inscribed.   The gas-insulated bus bar according to any one of claims 1 to 4, comprising a plurality of the conductors.

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