JP2011250544A - Panel row type gas insulation switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an airtight holding structure of a panel row type gas insulation switchgear improved to be capable of holding air-tightness of a bus line penetrating part of a sealed container by combining light-weight components having good handling ability.SOLUTION: A panel row is constituted with a unit panel which is composed of a sealed container 4 in which an insulation gas is encapsulated and a main circuit apparatus and a bus line 9 are stored. In the periphery of a bus line penetrating part 4a, which is an opening made through a wall surface of the sealed container 4 to insert the bus line 9, an O-ring 11 is interposed between adjacent sealed containers 4 to airtightly seal them to form a airtight holding structure. The O-ring 11 is held by a holding metal fitting 14 which is made by applying sheet metal working to a thin steel plate. The holding metal fitting 14 is interposed between adjacent bus line penetrating parts 4a together with the sealed container 4 and integrally tightened with a bolt. The holding metal fitting 14 has a window hole opened in the center of a plate surface made of the thin steel plate to insert the bus line 9 and has a structure in which an outer periphery side face area is processed with a bending work to become a sigmoid cross section and O-ring grooves 14a and 14b are molded on both faces. After the O-ring 11 is set into the O-ring groove and held, an inner peripheral side base part, overlapped with a liner 10 is interposed between the sealed containers 4 and tightened with a bolt 12 and a nut 13.

Description

  The present invention relates to a column-type gas in which an airtight container filled with an insulating gas is constructed in a panel, and a unit panel in which main circuit equipment and busbars are arranged is arranged in parallel with other unit panels. More specifically, the insulation switchgear relates to an airtight holding structure of a bus bar penetrating portion opened in the wall surface of the hermetic container so as to pass a bus bar between unit panels.

As a gas-insulated switchgear for high-voltage power distribution equipment, a unit panel (cubic switchgear) with power cables, disconnectors, circuit breakers, busbars, etc. installed in a panel filled with insulating gas such as SF ₆ gas A column-type gas insulated switchgear in which a plurality of units are arranged side-by-side to form a column, and a bus bar is wired between the columns through the side wall of each unit panel is known (for example, see Patent Document 1). ).

  On the other hand, for the unit panel, a steel plate sealed container filled with an insulating gas is built inside the panel cabinet, and main circuit equipment such as a circuit breaker and a bus bar are arranged in the sealed container. A row type gas insulated switchgear is known (see, for example, Patent Document 2).

  Next, FIG. 7 shows an example of a conventional structure of a unit panel (power receiving panel) that constitutes the row type gas insulated switchgear. In FIG. 7, 1 is a board cabinet (outer frame) of the unit board, 2 is a cable room, 3 is a power cable drawn into the cable room 2 from the outside of the board, 4 is an airtight container made of steel plate constructed in the center of the board, 5 is a control room, 6 is a circuit breaker, 7 is a disconnect switch, 8 is a current transformer, 9 is a bus bar (bar conductor), and this unit panel is used as a power receiving panel in parallel with other unit panels (for example, feeder panels). A row-board gas insulated switchgear is constructed. The panel cabinet 1 of the unit panel has a structure in which the sealed container 4 is housed inside as a box-shaped housing as shown in the figure, and the front frame and the rear frame are combined before and after the sealed container 4 as a core. There is also.

Here, an insulating gas such as SF ₆ gas is pressurized and sealed in the hermetic container 4 at a gas pressure of about 0.2 to 0.3 MPa so as to improve the insulating property of the charged part of the main circuit device. Further, the closed container 4 has a bus-bar through portion 4a opened on a wall surface facing the closed vessel of the adjacent unit board, and the rows of boards are connected to each other through the bus-bar 9 to the bus-bar through section 4a. In order to prevent the insulating gas sealed in the sealed container from leaking to the bus bar penetration part 4a, the bus bar penetration part 4a of the sealed container 4 of the adjacent unit board is connected via an airtight holding structure as described below. I have to.

  Next, the airtight holding structure employed in the conventional row-type gas insulated switchgear for the bus bar penetration 4a of the sealed container 4 is shown in FIGS. 8 (a) and 8 (b). That is, in order to pass the bus 9 across the unit boards I and II of the adjacent row boards, the cross section is concave toward the wall surface of each sealed container 4 so as to surround the opening 4b formed on the side wall surface of the sealed container 4. A spacer (liner) 10 in which O-ring grooves 10a and 10b are engraved is interposed, and O-rings 11 are inserted and held in the O-ring grooves 10a and 10b of the spacer 10 one by one, and then a bolt 12 and a nut 13, the sealed container 4 and the spacer 10 are bolted together, and the O-ring 11 is pressurized to a compressed state to prevent leakage of the insulating gas sealed in the sealed container 4.

  In the structure of FIG. 8 (a), the O-ring grooves 10a and 10b are engraved on both the front and back surfaces of the spacer 10 at the same position. In the structure of FIG. 8 (b), the O-ring grooves 10a and 10b are shifted to the inner and outer circumferences. Are engraved on both sides.

Japanese Utility Model Publication No. 63-127210 JP 2009-189129 A

  With regard to the gas insulated switchgear described above, in recent years, in order to reduce the weight of the panel and reduce the material and processing costs, the use of a thin plate for the sealed container 4 has been promoted.

  By the way, in the conventional structure of the bus bar penetrating portion 4a (see FIG. 8), the thick spacer 10 interposed between the sealed containers 4 between adjacent unit panels is cut in advance to obtain an O-ring. The grooves 10a and 10b are engraved. For this reason, the material cost and the groove processing cost of the spacer 10 are increased and the weight is heavy, and it is difficult for one worker to handle it easily. For this reason, it is difficult to assemble the spacer 10 and the O-ring 11 into the bus bar penetration 4a of the hermetic container 4 manually by an operator when assembling the column at the installation site of the column-type gas insulated switchgear. There is a demand for reducing the weight of the airtight holding structure and improving the assemblability as countermeasures.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and its purpose is to solve the above-mentioned problems, and to improve the airtight sealing of the bus bar penetration portion of the hermetic container by combining lightweight and good handling parts. An object of the present invention is to provide an airtight holding structure for a panel-shaped gas insulated switchgear.

In order to achieve the above object, according to the present invention, there is provided a unit board having a structure in which a sealed container in which an insulating gas is sealed in a board is constructed, and a main circuit device and a bus bar are accommodated in the sealed container. This is a row-type gas insulated switchgear that is arranged side by side with other unit boards, and the buses are wired between the unit boards through the bus bar penetrations that are opened in the wall of the sealed container with the opening positions aligned. In addition, an airtight seal of the gas space of the bus bar penetrating part is achieved by interconnecting the airtight containers of the adjacent unit boards with an O-ring interposed in the peripheral area of the bus bar penetrating part facing each other.
The O-ring is held by a thin steel plate holding member, and the holding member is interposed between the wall surfaces of the peripheral portion of the bus bar penetration portion of the adjacent unit panel together with the O-ring, and then the O-ring is compressed. The O-ring holding member is bolted to the sealed container so as to pressurize (Claim 1), and the airtight holding structure can be specifically configured in the following manner.
(1) The O-ring holding member is formed by bending an outer peripheral side surface area of a thin steel plate having a window hole corresponding to the shape of the bus bar penetrating portion at the center of the plate surface into an S-shaped cross section on both sides of the O-ring groove. After holding the O-ring in the O-ring groove, the inner base of the holding bracket is interposed between the wall surfaces of the sealed containers of the adjacent unit panels and sealed with the holding bracket. The container and the container are bolted together (claim 2).
(2) The holding member of the O-ring is a bowl-shaped holding plate that is integrally formed with the O-ring and extends to the inner peripheral side of the O-ring, and the wall surface of the sealed container of the adjacent unit panel The hook-shaped holding plate and the airtight container are integrally bolted with a gap therebetween.
(3) In the airtight holding structure according to the preceding items (1) and (2), a spacer is placed on the holding member of the O-ring so as to be interposed between the wall surfaces of the hermetic containers of the adjacent unit panels and fastened with bolts. 4).
(4) In the airtight holding structure according to (1) and (2) above, a step-shaped fastening flange projecting toward the mating sealed container is formed in the peripheral area of the bus bar of the sealed container of each unit panel Then, an O-ring holding member is directly interposed between the fastening flanges to fasten the bolts (Claim 5).

  According to the above airtight holding structure, the hermetic container and the holding member for the O-ring are both made of thin steel plates, while reducing the material cost and the processing cost, while holding the O-ring, the bus bar penetration portion of the adjacent unit board By tightening the holding member interposed between the bolts integrally with the hermetic container, the O-ring held by the holding member is pressed into a compressed state in the same manner as in the conventional airtight protection structure, and the peripheral area of the bus bar penetration portion Can be hermetically sealed. In addition, this O-ring holding member is lightweight and easy to handle, so that it is possible to easily perform the assembling work performed at the installation site of the row type gas insulated switchgear.

  In addition, according to the configuration in which the bowl-shaped holding plate is integrally formed with the O-ring (Claim 3), the O-ring can be held in a predetermined position and bolted without processing the O-ring groove in the holding member. In addition, since the bus bar penetrating portion of the adjacent sealed container can be hermetically sealed with one O-ring, the effect of reducing the number of parts and the number of assembly steps can be obtained.

It is sectional drawing showing the airtight holding structure of the bus-bar penetration part by Example 1 of this invention. It is sectional drawing showing the airtight holding structure of the bus-bar penetration part by Example 2 of this invention. It is sectional drawing showing the airtight holding | maintenance structure of the bus-line penetration part by Example 3 of this invention. FIG. 6 is a diagram showing an airtight holding structure of a bus bar penetration portion according to a fourth embodiment of the present invention, where (a) is a sectional view of the assembly structure, and (b) is a partial perspective view of an O-ring with an integrated holding metal fitting in FIG. FIG. It is an airtight structure figure of a bus-line penetration part by Example 5 of this invention, (a) is a sectional view of the assembly structure, (b) is a fragmentary perspective view of an O ring with an integrated holding fixture in (a) figure. It is. It is sectional drawing showing the airtight holding structure of the bus-bar penetration part by Example 6 of this invention. It is a structure sectional drawing of the unit panel which comprises a row-panel type gas insulated switchgear. It is an airtight holding | maintenance structural drawing of the prior art employ | adopted as the bus bar penetration part of the unit board of FIG. 7, Comprising: (a), (b) is sectional drawing of a different structural example, respectively.

  Embodiments of the present invention will be described below with reference to the examples shown in FIGS. In addition, in each Example, the same code | symbol is attached | subjected to the member corresponding to FIG. 8, and the description is abbreviate | omitted.

First, an airtight holding structure of an embodiment according to claims 1, 2, and 4 of the present invention is shown in FIG. In FIG. 1, a thin steel plate sealed container 4 constructed in a panel of a unit board (see FIG. 7) of a row type gas insulated switchgear is made of a thin steel plate having a thickness of about several millimeters, and adjacent units. Between the bus bar penetration part 4a opened to the opposing wall surface of the board | substrates I and II is mutually connected through the airtight holding | maintenance structure of the following description.

  That is, in this embodiment, the holding metal fitting 14 of the O-ring 11 is made by performing sheet metal processing on a thin steel plate having a thickness of about several millimeters similar to that of the sealed container 4, and the O-ring 11 is held by the holding metal fitting 14. In addition, the mounting base on the inner peripheral side thereof is overlapped with the spacer (liner) 10 and is interposed between the sealed containers 4 and fastened together with bolts 12 and nuts 13. The ring 11 is pressed and held in a compressed state to hermetically seal the space between the bus bar penetrating portions 4a. The thickness of the spacer 10 is set to a dimension that gives a predetermined “crushing allowance” to the O-ring 11 in a bolt-fastened state.

  Here, the holding metal fitting 14 is formed by subjecting a thin steel plate to sheet metal processing, opening a window hole corresponding to the shape of the bus bar penetrating portion 4a in the center of the plate surface, and drawing the outer peripheral surface area into an S-shaped cross section. Recessed O-ring grooves 14a and 14b are formed on both front and back sides, and one O-ring 11 is fitted and held in each of the O-ring grooves 14a and 14b.

  Compared with the conventional structure shown in FIGS. 8 (a) and 8 (b), the airtight holding structure of this embodiment has a lightweight O-ring holding fitting 14 made of a thin steel plate and good handleability, and has a plate surface. Since the uneven O-ring groove is formed by sheet metal processing, the necessary strength can be ensured, and the assembly work at the installation site can be performed easily.

  FIG. 2 is a structural diagram of a modified example of the first embodiment. In this embodiment, the mounting base of the holding metal fitting 14 made of a thin steel plate is sandwiched between the two spacers 10a and 10b. The bolts are interposed between adjacent sealed containers 4 and the other structures are the same as those in FIG.

  Next, as an application example of the first embodiment, an airtight holding structure according to claim 5 of the present invention is shown in FIG. That is, in the first and second embodiments, the spacer 10 or the spacers 10a and 10b are overlapped with the holding metal fitting 14 of the O-ring 11 and are interposed between the sealed containers 4, but in this embodiment, A stepped fastening flange 4c is formed in such a manner that a step is formed in the peripheral area of the bus bar penetrating portion 4a opened in the sealed container 4 so as to protrude toward the counterpart container, and it is thin without using a spacer at the time of assembly. A steel plate holding fitting 14 is directly interposed between the fastening flanges 4c so as to be bolted together.

  With this structure, the number of parts can be reduced by omitting the spacers in the first and second embodiments, and the mechanical strength of the bus bar penetrating portion 4a opened in the sealed container 4 by bending the fastening flange 4c is also ensured. it can.

  Next, an airtight holding structure of an embodiment according to claims 3 and 4 of the present invention is shown in FIGS.

  In this embodiment, a hook-shaped holding plate 15 is integrally formed with the O-ring on the inner peripheral side of the O-ring 11 as a holding member of the O-ring 11, and in the same manner as in the embodiment of FIG. The two spacers 10a and 10b are overlapped on both sides with the circumferential base portion interposed therebetween, and then interposed between adjacent sealed containers 4 and bolted together. In addition, the hole 15a drilled in the bowl-shaped holding plate 15 in FIG. 4B is a through hole for the bolt 12.

  In the airtight holding structure of this embodiment, the O-ring 11 is held by the bowl-shaped holding plate 15, and the O-ring 11 is simultaneously pressed against the wall surface of the adjacent sealed container 4 at this holding position, so that the space between the bus bar penetrations 4a is airtight. Will be sealed. Therefore, only one O-ring 11 is used, and the number of parts can be reduced as compared with the first to third embodiments, and the processing of the O-ring groove is not necessary.

  FIG. 5 shows an airtight holding structure showing a modified example of the fourth embodiment. In this embodiment, the attachment base portion of the hook-shaped holding plate 15 integrally formed with the O-ring 11 is bent in a Z shape as shown in the figure, and the spacer 10 is overlapped on the hook-shaped holding plate 15 and then sealed. The container 4 is interposed and fastened with bolts. Thereby, like the structure of Example 4 shown in FIG. 4, the space | interval between bus-line penetration parts 4a can be sealed.

  Next, FIG. 6 shows an example in which the flanged O-ring employed in Examples 4 and 5 is combined with the fastening flange of the sealed container in Example 3. In this embodiment, a fastening flange 4c having a stepped shape similar to that of the embodiment 3 is formed in the bus bar penetration portion 4a of the adjacent sealed container 4, and the hook-shaped holding plate 15 integrally formed with the O-ring 11 is attached to the fastening flange. It is directly interposed between 4a and bolted integrally with the sealed container 4.

  Thereby, the spacers 10, 10a, 10b in the fourth and fifth embodiments can be omitted, and the number of parts can be reduced.

1: Unit panel board cabinet 4: Sealed container 4a: Bus bar penetration 4c: Fastening flange 9: Bus bars 10, 10a, 10b: Spacer (liner)
11: O-ring 12: Bolt 13: Nut 14: O-ring holding bracket 14a, 14b: O-ring groove 15: O-ring saddle-shaped holding plate

Claims (5)

A closed container in which insulating gas is sealed in the panel is constructed, and a unit panel in which the main circuit device and the busbar are accommodated in the sealed container is juxtaposed with other unit panels to form a panel. It is a row-board type gas insulated switchgear, and the bus bars are wired between the unit panels through the bus bar penetrating part that is opened on the wall of the sealed container with the opening position aligned, and the peripheral area of the bus bar penetrating part facing each other In which the closed containers of the adjacent unit panels are interconnected via an O-ring and the gas space of the bus bar penetration is hermetically sealed,
The O-ring is held by a thin steel plate holding member, and the holding member is interposed between the wall surfaces of the peripheral portion of the bus bar penetration portion of the adjacent unit panel together with the O-ring, and then the O-ring is compressed. A row type gas insulated switchgear characterized in that the holding member of the O-ring is bolted to an airtight container so as to press.   2. The row-panel gas-insulated switchgear according to claim 1, wherein the O-ring holding member has an S-shaped cross section in the outer peripheral side surface area of the thin steel plate having a window hole corresponding to the shape of the bus bar penetrating portion at the center of the plate surface. It becomes a holding metal fitting that has O-ring grooves formed on both the front and back sides, and after the O-ring is fitted and held in the O-ring groove, the inner peripheral base of the holding metal fitting is the wall surface of the airtight container of the adjacent unit panel A row-board type gas insulated switchgear characterized in that the holding metal fitting and the sealed container are bolted together by interposing them.   2. The row type gas insulated switchgear according to claim 1, wherein the holding member of the O-ring is a hook-shaped holding plate that is integrally formed with the O-ring and extends to the inner peripheral side of the O-ring, and the hook-shaped holding member A row type gas insulated switchgear characterized in that a plate is interposed between the wall surfaces of an airtight container of an adjacent unit panel, and the bowl-shaped holding plate and the airtight container are integrally bolted together.   The row board type gas insulated switchgear according to claim 2 or 3, wherein a spacer is overlapped with a holding member of an O-ring and interposed between the wall surfaces of the hermetically sealed containers of adjacent unit boards and bolted. A board-type gas insulated switchgear characterized by the above.   4. The row board type gas insulated switchgear according to claim 2, wherein a stepped fastening flange projecting toward a mating sealed container is provided in the peripheral area of the bus bar of the sealed container of each unit panel. A row type gas insulated switchgear characterized in that, after being formed, an O-ring holding member is directly interposed between the fastening flanges and bolted.

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