JP2015023701A - Gas insulation switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas insulation switching device that restricts flexural vibration caused in the lower parts of bushes and has improved earthquake-resistance.SOLUTION: The upper part of a gas insulation unit 5 is provided with a pair of branch pipes 3. One plate 7 is arranged on the upper parts of the branch pipes 3. The flanges 4 of the branch pipes 3 are fastened to the underside of the plate 7. Annular bodies 2 are fastened to the top face of the plate 7 so as to correspond to the positions of the branch pipes 3. The lower end parts of bushes 1 are fitted in the annular bodies 2. The branch pipes 3 and bushes 1 are connected via the annular bodies 2 and holes 60 provided in the plate 7. In such a configuration, the plate 7 is directly supported by a plurality of support legs 8.

Description

  The present invention relates to a gas insulated switchgear.

  A conventional gas circuit breaker includes a gas tank body part containing an interrupting part and an insulating gas, two bushing branch pipes formed protruding from the gas tank body part, and a bushing provided at an end of each bushing branch pipe A bushing supported via a flange, a first support leg that supports the gas tank body, and a second support leg that supports the bushing flanges (see Patent Document 1). The second support legs are provided separately into a plurality of supporting the one bushing flange and a plurality supporting the other bushing flange. That is, the second support leg is provided separately for each bushing.

  In this conventional gas circuit breaker, the first and second support legs directly support the gas tank body and the bushing branch pipe, respectively, thereby increasing the natural frequency of the structure from the gas tank body to the top of the bushing, and vibration due to earthquake. The vibration of the bushing at the time of generation | occurrence | production is suppressed and the stress of the junction part of a bushing and a bushing branch pipe is suppressed.

Japanese Patent Publication No. 4-75612

  However, in the conventional gas circuit breaker, there is no member that supports the bushing at the tip portion, and the first support leg is provided at the joint between the second support leg and the bushing branch pipe when vibration due to an earthquake occurs. A greater stress or bending moment is applied than the joint between the gas tank body and the gas tank body, but the second support legs are configured for each bushing, and the distance between the support legs is reduced for the second support legs that support the bushing flanges. Therefore, it is difficult to suppress the bending vibration generated in the lower part of the bushing by the second support leg, and there is a problem that the earthquake resistance is also lowered.

  The present invention has been made in view of the above, and an object of the present invention is to provide a gas insulated switchgear that suppresses bending vibration generated in the lower part of the bushing and has improved seismic performance.

  In order to solve the above-mentioned problems and achieve the object, a gas insulated switchgear according to the present invention has a tank arranged with its axis line horizontal, and has a first and an axially spaced upper part of the tank. A gas circuit breaker provided with a second branch pipe and a flange provided at an end of the first branch pipe are fastened to the lower surface, and a first hole communicating with the first branch pipe A first fastening portion provided with a flange, and a flange provided at an end of the second branch pipe are fastened to the lower surface, and a second hole communicating with the second branch pipe is provided. A second fastening portion, a connecting portion for integrally connecting the first and second fastening portions, and an upper surface of the first fastening portion, and the first branch pipe and the first hole. A first torus disposed coaxially with the portion and an upper surface of the second fastening portion, and the second branch pipe And a second torus disposed coaxially with the second hole portion, and a lower end portion is fitted into the first torus, and the lower end portion is located at the first fastening portion. The first bushing that is in contact with the edge of the first hole portion, the lower end portion is fitted into the second annular body, and the lower end portion is the second hole in the second fastening portion. A second bushing that is in contact with the edge of the part, a plurality of first support legs that support the tank, and a plurality of second parts that support the first and second fastening parts or the connecting part. And a supporting leg.

  According to the present invention, there is an effect that it is possible to provide a gas insulated switchgear in which bending vibration generated in the lower part of the bushing is suppressed and the seismic performance is improved.

1 is a front view showing a configuration of a gas-insulated switchgear according to Embodiment 1. FIG. FIG. 2 is a side view showing the configuration of the gas-insulated switchgear according to the first embodiment. FIG. 3 is a cross-sectional view showing details of joining of the branch pipe and the bushing in the first embodiment. FIG. 4 is a front view showing the configuration of the gas-insulated switchgear according to the second embodiment. FIG. 5 is a side view showing the configuration of the gas insulated switchgear according to the second embodiment. FIG. 6 is a cross-sectional view showing details of the joining between the branch pipe and the bushing in the second embodiment. FIG. 7 is a front view showing the configuration of the gas-insulated switchgear according to the third embodiment. FIG. 8 is a side view showing the configuration of the gas-insulated switchgear according to the third embodiment. FIG. 9 is a front view showing the configuration of the gas-insulated switchgear according to the fourth embodiment. FIG. 10 is a side view showing the configuration of the gas-insulated switchgear according to the fourth embodiment.

  Embodiments of a gas insulated switchgear according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a front view showing a configuration of a gas-insulated switchgear according to the present embodiment, FIG. 2 is a side view showing a configuration of the gas-insulated switchgear according to the present embodiment, and FIG. It is sectional drawing which shows the detail of joining of the branch pipe and bushing in. Hereinafter, the configuration of the present embodiment will be described with reference to FIGS.

  The gas insulated switchgear according to the present embodiment includes a gas circuit breaker 5 and two bushings 1. The gas circuit breaker 5 is a so-called horizontal circuit breaker, and the cylindrical tank 20 containing the insulating gas and the circuit breaker is arranged with the axis line horizontal. The gas circuit breaker 5 is supported by a plurality of support legs 6 disposed on an installation surface 50 that is the ground surface or the floor surface. That is, the upper end portion of the support leg 6 is fixed to the tank 20. The tank 20 is a metal container, for example, and is grounded.

  A pair of branch pipes 3 formed integrally with the tank 20 is provided on the upper side surface of the tank 20. The pair of branch pipes 3 are provided apart from each other in the axial direction of the tank 20. A flange 4 is formed at the end of the branch pipe 3. One plate 7 is disposed on the upper part of the pair of branch pipes 3, and the flange 4 of each branch pipe 3 is fastened to the lower surface of the plate 7. The plate 7 is a metal plate, for example.

  A pair of torus 2 is fastened to the upper surface of the plate 7. The pair of toric bodies 2 are arranged corresponding to the pair of branch pipes 3, one of the branch pipes 3 and one of the toric bodies 2 are arranged coaxially, and the other branch pipe 3 and the other torus 2 are also arranged. It is arranged coaxially. The torus 2 is made of metal, for example. A hole 7 is provided in the plate 7 sandwiched between the torus 2 and the flange 4 so as to communicate the torus 2 and the branch pipe 3 (FIG. 3). That is, two holes 60 are provided in the plate 7 corresponding to the position of the branch pipe 3.

  The lower end of the bushing 1 is fitted into the torus 2, and the branch pipe 3 and the bushing 1 are connected to each other via the hole 60 and the torus 2. The bushing 1 is supported by the torus 2 and the edge of the hole 60 in the plate 7. As described above, the gas circuit breaker 5 is connected to the pair of bushings 1 with the plate 7 interposed therebetween.

  The plate 7 extends so as to cover the tank 20 in the axial direction of the tank 20 and in the horizontal direction perpendicular thereto. The plate 7 is supported by support legs 8 different from the support legs 6. The support leg 8 is disposed on the installation surface 50, and the upper end portion is attached to the plate 7. The support legs 8 are provided at a plurality of locations including at least the four corners of the plate 7. A reinforcing member 9 is provided between the support legs 8 in a truss shape.

  Next, details of the joining of the branch pipe 3 and the bushing 1 will be described (FIG. 3). The plate 7 and the torus 2 are positioned with respect to the branch pipe 3 so that the branch pipe 3, the hole 60, and the bushing 1 are coaxial. The flange 4 is provided with a plurality of bolt insertion holes in the circumferential direction, and the flange 4 is fastened to the plate 7 by bolts 11 inserted through the bolt insertion holes. Further, a circumferential groove is provided on the upper end surface of the flange 4, and an O-ring 13 is disposed in the groove. The O-ring 13 hermetically seals the joint surface between the branch pipe 3 and the plate 7.

  Further, the torus 2 has an L-shaped cross section, for example, and a plurality of bolt insertion holes are provided in the circumferential direction in the flange-shaped portion, and are fastened to the plate 7 by bolts 10 inserted through the respective bolt insertion holes. ing. Further, a circumferential groove is provided on the lower end surface of the annular body 2, and an O-ring 12 is disposed in the groove. The O-ring 12 makes the joint surface between the torus 2 and the plate 7 airtight. The diameter of the hole portion 60 is larger than the inner diameter of the lower end portion of the bushing 1 and smaller than the outer diameter of the lower end portion of the bushing 1. Therefore, the lower end surface of the bushing 1 is in contact with and locked to the edge of the hole 60 in the plate 7.

  With this configuration, the inside of the branch pipe 3 communicates with the inside of the bushing 1 through the hole 60, and the central conductor 30 routed from the tank 20 passes through the branch pipe 3 and the hole 60. 1 is pulled out. Further, the upper end portion of the support leg 8 is joined to the lower surface of the plate 7. Thus, the support leg 8 directly supports the plate 7 without directly supporting the lower end portion of the flange 4 or the torus 2 or the bushing 1.

  According to the present embodiment, since the rigid plate 7 to which the two bushings 1 are connected is supported by the support legs 8, the maximum distance between the support legs 8 is increased, and the bushing 1 Bending vibration around the lower annular body 2 can be suppressed, and seismic performance can be improved.

  On the other hand, in the gas circuit breaker described in Patent Document 1, the support legs directly support the bushing flanges, and the support legs are disposed locally for each bushing, and the support legs supporting one bushing and the other Since there is no member that connects the supporting leg that supports the bushing, it is difficult to suppress bending vibration around the torus of the bushing, and it is difficult to improve the earthquake resistance.

Embodiment 2. FIG.
4 is a front view showing the configuration of the gas-insulated switchgear according to this embodiment, FIG. 5 is a side view showing the configuration of the gas-insulated switchgear according to this embodiment, and FIG. 6 is this embodiment. It is sectional drawing which shows the detail of joining of the branch pipe and bushing in. Hereinafter, the configuration of the present embodiment will be described with reference to FIGS.

  The gas insulated switchgear according to the present embodiment includes a gas circuit breaker 5 and two bushings 1. The gas circuit breaker 5 is a so-called horizontal circuit breaker, and the cylindrical tank 20 containing the insulating gas and the circuit breaker is arranged with the axis line horizontal. The gas circuit breaker 5 is supported by a plurality of support legs 6 disposed on an installation surface 50 that is the ground surface or the floor surface. That is, the upper end portion of the support leg 6 is fixed to the tank 20. The tank 20 is a metal container, for example, and is grounded.

  A pair of branch pipes 3 formed integrally with the tank 20 is provided on the upper side surface of the tank 20. The pair of branch pipes 3 are provided apart from each other in the axial direction of the tank 20. A flange 4 is formed at the end of the branch pipe 3 (FIG. 6). A single plate 14 is disposed on the upper side of one branch pipe 3, and another single plate 14 is disposed on the upper side of the other branch pipe 3. That is, different plates 14 are arranged on the upper portions of the pair of branch pipes 3. The flange 4 of the branch pipe 3 is fastened to the lower surface of the plate 14. The plate 14 is a metal plate, for example.

  An annular body 2 is fastened to the upper surface of the plate 14. The torus 2 is arranged corresponding to the branch pipe 3, and the branch pipe 3 and the torus 2 are arranged coaxially. The torus 2 is made of metal, for example. A hole 14 is provided in the plate 14 sandwiched between the torus 2 and the flange 4 so as to communicate the torus 2 and the branch pipe 3 (FIG. 6). That is, the hole 60 is provided in one place on the plate 14 corresponding to the position of the branch pipe 3.

  The lower end of the bushing 1 is fitted into the torus 2, and the branch pipe 3 and the bushing 1 are connected to each other via the hole 60 and the torus 2. The bushing 1 is supported by the torus 2 and the edge of the hole 60 in the plate 14. As described above, the gas circuit breaker 5 is connected to the pair of bushings 1 with the two plates 14 interposed therebetween.

  The plate 14 is localized at the location where the flange 4 and the torus 2 are arranged. A single plate 15 is disposed below the two plates 14 and above the tank 20 (more precisely, the trunk of the tank 20 excluding the branch pipe 3). The plate 15 extends so as to cover the tank 20 in the axial direction of the tank 20 and in the horizontal direction perpendicular thereto. Two plates 14 are fastened to the upper surface of the plate 15. The plate 15 has two holes 15a through which the two branch pipes 3 pass (FIG. 6). The plate 15 is supported by support legs 8 different from the support legs 6. The support leg 8 is disposed on the installation surface 50 and has an upper end attached to the plate 15. The support legs 8 are provided at a plurality of locations including at least the four corners of the plate 15. A reinforcing member 9 is provided between the support legs 8 in a truss shape.

  Next, details of the joining of the branch pipe 3 and the bushing 1 will be described (FIG. 6). The plate 14 and the torus 2 are positioned with respect to the branch pipe 3 so that the branch pipe 3, the hole 60, and the bushing 1 are coaxial. The flange 4 is provided with a plurality of bolt insertion holes in the circumferential direction, and the flange 4 is fastened to the plate 14 by bolts 11 inserted through the bolt insertion holes. Further, a circumferential groove is provided on the upper end surface of the flange 4, and an O-ring 13 is disposed in the groove. The O-ring 13 hermetically seals the joint surface between the branch pipe 3 and the plate 14.

  Further, the torus 2 has an L-shaped cross section, for example, and a plurality of bolt insertion holes are provided in the circumferential direction in the flange-shaped portion, and are fastened to the plate 14 by bolts 10 inserted through the bolt insertion holes. ing. Further, a circumferential groove is provided on the lower end surface of the annular body 2, and an O-ring 12 is disposed in the groove. The O-ring 12 hermetically seals the joint surface between the torus 2 and the plate 14. The diameter of the hole portion 60 is larger than the inner diameter of the lower end portion of the bushing 1 and smaller than the outer diameter of the lower end portion of the bushing 1. Therefore, the lower end surface of the bushing 1 is in contact with and locked to the edge of the hole 60 in the plate 14.

  With this configuration, the inside of the branch pipe 3 communicates with the inside of the bushing 1 through the hole 60, and the central conductor 30 routed from the tank 20 passes through the branch pipe 3 and the hole 60. 1 is pulled out.

  Further, the plate 15 disposed at the lower portion of the plate 14 is provided with holes 15 a at two locations corresponding to the position of the branch pipe 3. The diameter of the hole 15a is larger than the outer diameter of the flange 4, the branch pipe 3 is inserted through the hole 15a, and the upper end of the flange 4 protrudes slightly from the hole 15a. The plate 14 is disposed on the plate 15 so as to close the hole 15a, and is fastened to the upper surface of the plate 15 with bolts 16. That is, the two plates 14 are connected by the single plate 15. Further, the upper end portion of the support leg 8 is joined to the lower surface of the plate 15. Thus, the support leg 8 does not directly support the lower end portion of the flange 4 or the torus 2 or the bushing 1.

  According to the present embodiment, the rigid plate 15 that couples the two plates 14 to which the two bushings 1 are connected is supported by the support legs 8. The maximum distance is increased, bending vibration around the torus 2 at the bottom of the bushing 1 can be suppressed, and seismic performance can be improved.

  In this embodiment, the height can be adjusted by sandwiching a shim between the plate 14 and the plate 15.

Embodiment 3 FIG.
FIG. 7 is a front view showing the configuration of the gas insulated switchgear according to the present embodiment, and FIG. 8 is a side view showing the configuration of the gas insulated switchgear according to the present embodiment. In FIG. 7 and FIG. 8, the same components as those in FIG. 1 and FIG. 2 are denoted by the same reference numerals, and the difference from the configuration in FIG.

  As shown in FIGS. 7 and 8, one plate 25 is disposed on the upper side of one branch pipe 3, and another plate 25 is disposed on the upper side of the other branch pipe 3. That is, different plates 25 are arranged on the upper portions of the pair of branch pipes 3. Further, the flange 4 of the branch pipe 3 is fastened to the lower surface of the plate 25. The plate 25 is a metal plate, for example.

  An annular body 2 is fastened to the upper surface of the plate 25. The torus 2 is arranged corresponding to the branch pipe 3, and the branch pipe 3 and the torus 2 are arranged coaxially. A hole (not shown) is provided in the plate 25 sandwiched between the torus 2 and the flange 4 so that the torus 2 and the branch pipe 3 communicate with each other. That is, one hole (not shown) is provided in the plate 25 corresponding to the position of the branch pipe 3.

  The lower end of the bushing 1 is fitted into the torus 2, and the branch pipe 3 and the bushing 1 are connected to each other via a hole (not shown) and the torus 2. The bushing 1 is supported by the torus 2 and the edge of a hole (not shown) in the plate 25. As described above, the gas circuit breaker 5 is connected to the pair of bushings 1 with the two plates 25 interposed therebetween.

  The plate 25 is localized at the place where the flange 4 and the torus 2 are arranged. A connecting member 17 extending in the axial direction of the tank 20 is joined to the upper part of the two plates 25. That is, one end of the connecting member 17 is joined on one plate 25, the other end of the connecting member 17 is joined on the other plate 25, and the connecting member 17 connects the plates 25 together. The connecting member 17 can be, for example, an H-shaped steel material. A plurality of (for example, two) connecting members 17 are provided.

  The plate 25 is supported by support legs 8 different from the support legs 6. The support leg 8 is disposed on the installation surface 50 and has an upper end attached to the plate 25. The support legs 8 are provided at a plurality of locations including at least the four corners of the plate 25.

  According to the present embodiment, the two rigid plates 25 to which the two bushings 1 are connected are coupled by the plurality of coupling members 17, and the two plates 25 are supported by the support legs 8. As a result, the maximum distance between the support legs 8 is increased, bending vibration about the torus 2 below the bushing 1 can be suppressed, and seismic performance can be improved.

  Embodiments 1 to 3 can be easily generalized. That is, the gas insulated switchgear according to the present embodiment includes a gas circuit breaker 5 in which a pair of branch pipes 3 separated in the axial direction are provided on the upper part of the tank 20, and an end of one branch pipe 3 on the lower surface. The flange 4 provided is fastened, and a first fastening portion provided with a first hole communicating with the branch pipe 3 and a flange 4 provided at the end of the other branch pipe 3 on the lower surface are provided. A second fastening portion that is fastened and provided with a second hole portion that communicates with the branch pipe 3, a connecting portion that integrally connects the first and second fastening portions, and the first fastening One annular body 2 that is fastened to the upper surface of the portion and coaxially arranged with the one branch pipe 3 and the first hole portion, and fastened to the upper surface of the second fastening portion and The other torus 2 arranged coaxially with the other branch pipe 3 and the second hole part, and the lower end part of the one circular part One bushing in which the lower end is in contact with the edge of the first hole in the first fastening portion and the lower end is inserted in the other annular body 2 while being inserted into the body 2 And the other bushing with the lower end abutting against the edge of the second hole in the second fastening portion, the plurality of support legs 6 for supporting the tank 20, and the first and second And a plurality of support legs 8 that support the fastening portion or the connecting portion. In the first embodiment, the first and second fastening portions and the connecting portion are all part of one plate 7. In the second embodiment, the first fastening portion is composed of a single plate 14, the second fastening portion is composed of another single plate 14, and the connecting portion is composed of another plate 15. In the third embodiment, the first fastening portion is composed of a single plate 25, the second fastening portion is composed of another single plate 25, and the connecting portion is composed of a connecting member 17.

Embodiment 4 FIG.
FIG. 9 is a front view showing the configuration of the gas insulated switchgear according to the present embodiment, and FIG. 10 is a side view showing the configuration of the gas insulated switchgear according to the present embodiment. In FIG. 9 and FIG. 10, the same components as those in FIG. 7 and FIG. 8 are denoted by the same reference numerals, and the differences from the configurations in FIG. 7 and FIG.

  As shown in FIGS. 9 and 10, the gas-insulated switchgear according to the present embodiment is a phase-separated gas-insulated switchgear. That is, the gas circuit breaker 5 is configured by including a blocking part in a tank 20 that is different for each phase. The three-phase tanks 20 are arranged in a direction in which the axes are parallel to each other and perpendicular to the axes. Further, the configurations of the gas circuit breaker 5, the bushing 1, the torus 2, the plate 25, the connecting member 17, the support legs 6, 8 and the reinforcing member 9 are the same as those in the third embodiment.

  In the present embodiment, a connecting member 18 extending in the arrangement direction of the tanks 20 is joined to the upper part of the three-phase connecting member 17. That is, the connecting member 18 extends between the phases, and is joined onto the connecting member 17 of each phase to connect the connecting members 17 together. The connecting member 18 can be, for example, an H-shaped steel material. A plurality of (for example, four) connecting members 18 are provided.

  This embodiment has the same effects as those of the third embodiment in the three-phase separation type gas insulated switchgear. In particular, since the three phases are connected to each other by the connecting member 18, the seismic performance is further improved.

  In the present embodiment, the configuration of the third embodiment has been described as an example. However, the configuration of the first or second embodiment may be configured for each phase, and the three phases may be coupled by the coupling member 18. . In this case, the connecting member 18 connects the plate 7 or the plate 15 or the plate 14 of each phase.

  The present invention is useful for a gas insulated switchgear.

  1 bushing, 2 torus, 3 branch pipe, 4 flange, 5 gas circuit breaker, 6, 8 support leg, 7, 14, 15, 25 plate, 9 reinforcing member, 10, 11, 16 bolt, 12, 13 O Ring, 15a hole, 17, 18 connecting member, 20 tank, 30 center conductor, 50 installation surface, 60 hole.

Claims (6)

A gas circuit breaker having a tank arranged with its axis horizontal, and provided with first and second branch pipes spaced axially at the top of the tank;
A flange provided at an end of the first branch pipe is fastened to a lower surface, and a first fastening part provided with a first hole communicating with the first branch pipe;
A flange provided at an end of the second branch pipe is fastened to the lower surface, and a second fastening part provided with a second hole communicating with the second branch pipe;
A connecting portion that integrally connects the first and second fastening portions;
A first torus fastened to the top surface of the first fastening portion and disposed coaxially with the first branch pipe and the first hole;
A second torus fastened to the upper surface of the second fastening portion and disposed coaxially with the second branch pipe and the second hole;
A first bushing in which a lower end is fitted into the first torus, and the lower end abuts against an edge of the first hole in the first fastening portion;
A second bushing in which a lower end is fitted into the second torus, and the lower end abuts against an edge of the second hole in the second fastening portion;
A plurality of first support legs for supporting the tank;
A plurality of second support legs for supporting the first and second fastening portions or the connecting portion;
A gas insulated switchgear characterized by comprising: The first and second fastening portions and the connecting portion are both part of a single plate,
The gas insulated switchgear according to claim 1, wherein the plurality of second support legs are attached to the plate to support the plate. The first fastening portion is composed of a single first plate,
2. The gas insulated switchgear according to claim 1, wherein the second fastening portion includes a single second plate different from the first plate. The connecting portion is composed of a third plate different from the first and second plates,
The third plate is disposed above the tank and below the first and second plates, and the first and second plates are fastened and the first branch pipe passes therethrough. A third hole portion and a fourth hole portion through which the second branch pipe passes,
The gas insulated switchgear according to claim 3, wherein the plurality of second support legs are attached to the third plate to support the third plate. The connecting portion includes a plurality of connecting members extending in the axial direction for connecting the first and second plates,
The gas insulated switchgear according to claim 3, wherein the plurality of second support legs are attached to the first and second plates to support the first and second plates.   The gas circuit breaker, the first fastening portion, the second fastening portion, the connecting portion, the first torus, the second torus, the first bushing, and the second bushing The first support leg and the second support leg are provided for each phase, and a connection part other than the three-phase connection part is joined on the three-phase connection part to thereby connect the three-phase part. The gas-insulated switchgear according to claim 5, wherein the connecting portion is connected by the another connecting portion.

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