JP6172344B1 - Gas insulated switchgear - Google Patents

Abstract

An object of the present invention is to suppress the occurrence of a ground fault by suppressing carbonization of an insulating material due to a hot gas flow. A gas insulated switchgear (1) is inserted into a hollow part (601) of an insulating support (6), and a tip part can project into a hollow part (512) of a movable support (51). Insulating operation rod (59) and movable exhaust pipe (56) inserted in the hollow portion of the movable support, the lower end portion of which is connected to the distal end portion of the insulating operation rod, and the upper end portion thereof is provided with a movable arc contact (57). And). In the movable exhaust pipe, a hot gas flow generated as the arc extinguishing gas is blown into the arc discharge flows into the interior from the upper end side and is exhausted from the lower end side to the hollow portion of the movable support. The movable support includes a discharge port (511) for discharging the hot gas flow into the container, and the hot gas flow exhausted from the lower end side of the movable exhaust pipe is directed toward the discharge port in the hollow portion of the movable support. A first rectifying member (592) and a second rectifying member (62) for guiding are provided. [Selection] Figure 5

Description

  The present invention relates to a gas insulated switchgear that opens and closes current in an insulating gas.

  In the gas insulated switchgear, arc discharge occurs between the arc contacts (fixed arc contact and movable arc contact) when the fixed contact and the movable contact are separated. A puffer-type gas-insulated switchgear for widely extinguishing an arc discharge generated by blowing an arc-extinguishing gas, which is an insulating gas, is widely used. In such a puffer type gas insulated switchgear, a hot gas flow generated when the arc discharge is extinguished is discharged into a tank which is a metal sealed container.

  Conventionally, in such a puffer type gas insulated switchgear, the operation rod that supports the movable arc contact is made hollow, and the hot gas flow flows into the operation rod from one end on the movable arc contact side, It is comprised so that it may pass to the airtight container from the communicating hole provided in the other end part side (for example, refer patent documents 1-3).

Japanese Patent Laying-Open No. 2015-041504 JP 2009-289614 A Japanese Patent Laid-Open No. 6-44877

  In the puffer type gas insulated switchgear as described above, the drive mechanism for moving the movable arc contact may be constituted by a movable exhaust pipe and an insulating operation rod connected to one end of the movable exhaust pipe. is there.

  In this case, a hollow insulating support is placed in a metal container filled with an arc extinguishing gas to support the hollow movable part. Further, an insulating operation rod is inserted into the hollow portion of the insulating support, the tip portion is projected into the hollow portion of the movable portion, and one end portion of the movable exhaust pipe is connected to the tip portion. Further, the movable part is provided with a discharge port for discharging the hot gas flow into the metal container.

  In such a configuration, the hot gas flow generated with the blowing of the arc extinguishing gas to the arc discharge flows into the inside from the other end side of the movable exhaust pipe, and the hollow portion of the movable part from the one end side. And is discharged from a discharge port provided in the movable part into the metal container.

  However, in the gas-insulated switchgear including the movable exhaust pipe and the insulating operation rod as described above, the vicinity of the end of the insulating operation rod is exposed to the hot gas flow discharged from one end side of the movable exhaust pipe. Therefore, there is a possibility that the insulating material constituting the insulating operation rod may be carbonized. For this reason, the insulation of the insulating operation rod is lowered, the recovery voltage applied after the interruption is not able to endure, and a ground fault may occur.

  Further, the hot gas flow flows into the hollow portion of the insulating support through the opening where the hollow portion of the insulating support and the hollow portion of the movable portion communicate with each other, and the inner surface of the insulating support is exposed to the hot gas flow. As a result, the insulating material constituting the insulating support may be carbonized. Therefore, if the insulation of the insulating support is lowered and a system voltage is applied, a ground fault may occur.

The present invention has been made in view of such problems, it aims to suppress carbonization of the insulating material by Netsuga scan, to provide a gas insulated switchgear which can prevent the occurrence of a ground fault And

This onset Ming gas insulated switchgear, in a container filled with arc-extinguishing gas, by blowing the arc-extinguishing gas to an arc discharge the movable arcing contact occurs when away from the stationary arcing contact extinguishing A gas-insulated switchgear that is supported by a fixed support that supports the fixed arc contactor and a hollow insulating support disposed in the container, and is a hollow movable device disposed opposite the fixed support. A support, an insulating operation rod inserted into the hollow portion of the insulating support, and a tip portion protruding into the hollow portion of the movable support; and the insulating support rod inserted into the hollow portion of the movable support; A movable exhaust pipe connected to the tip of the operating rod and provided with the movable arc contact at the other end, and the movable exhaust pipe sprays the arc extinguishing gas onto the arc discharge. And an exhaust hole that exhausts the hot gas that has been generated and flows into the movable arc contactor from the one end side to the hollow portion of the movable support, and the movable support includes the hot gas. A discharge port for discharging the liquid into the container, a hollow portion of the movable support, and a convex portion protruding toward the fixed support side at an end portion on the insulating support side, and a tapered outer surface portion of the convex portion. A rectifying member in which is formed is provided.
In the onset Ming gas insulated switchgear, the rectifying member is preferably reduced in diameter the opening communicating with one another in each of the hollow portion of the movable support and the insulating support.
In the onset Ming gas insulated switchgear, the rectifying member is preferably formed of an insulating material.
The gas-insulated switchgear according to the present invention extinguishes the arc by blowing the arc-extinguishing gas to an arc discharge generated when the movable arc contact is separated from the fixed arc contact in a container filled with the arc-extinguishing gas. A gas-insulated switchgear comprising a fixed support for supporting the fixed arc contact and a hollow movable support supported by a hollow insulating support disposed in the container and disposed opposite the fixed support And an insulating operation rod inserted into the hollow portion of the insulating support and having a tip portion protruding into the hollow portion of the movable support, and inserted into the hollow portion of the movable support, with the insulating operation at one end thereof. A movable exhaust pipe connected to the distal end of the rod through a connecting member and provided with the movable arc contact at the other end; and the movable exhaust pipe is adapted to the arc discharge. It has an exhaust hole for exhausting the hot gas, which is generated when arcing gas is blown, and flows into the hollow part of the movable support from the one end side, through the inflow hole provided in the movable arc contactor. The movable support includes a discharge port that discharges the hot gas into the container, and includes a rectifying member that protrudes in a radial direction of the movable exhaust pipe with an outer peripheral surface of the connecting member as a base end. The surface of the fixed support side of the movable support includes a terminal end portion on the base end side, and the surface is inclined toward the insulating support side from a surface orthogonal to the axial direction of the movable exhaust pipe, and the movable support is hollow. A convex portion protruding toward the fixed support side at the end on the insulating support side, and another rectifying member having a taper formed on the outer surface portion of the convex portion. And
In the onset Ming gas insulated switchgear, the other rectifying member is preferably reduced in diameter the opening communicating with one another in each of the hollow portion of the movable support and the insulating support.

In the onset Ming gas insulated switchgear, the rectifying member preferably includes a tapered surface member having a tapered surface which taper has spread from the fixed support side toward the insulating substrate side.

In the onset Ming gas insulated switchgear, the rectifying member, with the movement of the insulated operating rod, it is preferable to move the than the end of the insulating support side of the discharge port in the fixed support side.

In the onset Ming gas insulated switchgear, the insulating operating rod and said movable exhaust pipe is connected via a joint, the rectifying member is more preferably provided on the joint.

In the onset Ming gas insulated switchgear, the rectifying member, said a substantially circular shape of the outer peripheral edge when viewed from the axial direction of the upper or lower side of the movable exhaust pipe, and a movable exhaust pipe More preferably, it is substantially concentric.
In the gas insulated switchgear of the present invention, it is preferable that the convex portion is provided in a ring shape along an opening formed in the movable support so as to communicate with a hollow portion of the insulating support.

According to the gas insulated switchgear of the present invention, it is possible to suppress carbonization of the insulating material by Netsuga scan, to prevent the occurrence of a ground fault.

It is a fragmentary sectional view which shows the gas insulated switchgear concerning this Embodiment. It is explanatory drawing of the internal structure in the gas insulated switchgear which concerns on this Embodiment. It is explanatory drawing of the arc extinguishing principle in the gas insulated switchgear concerning this Embodiment. It is explanatory drawing which shows the flow of the hot gas flow in the reference example of a gas insulated switchgear. It is explanatory drawing which shows the induction | guidance | derivation of the hot gas flow by the rectification | straightening member in the gas insulated switchgear which concerns on this Embodiment. It is a top view which shows the diameter reducing member in the gas insulated switchgear concerning this Embodiment. It is explanatory drawing which shows the induction | guidance | derivation of the hot gas flow by the rectification | straightening member in the gas insulated switchgear which concerns on this Embodiment.

  Hereinafter, a gas insulated switchgear according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The gas-insulated switchgear according to the present invention is not limited to the following embodiments, and various modifications can be made within the scope of the gist thereof.

  FIG. 1 is a partial sectional view showing a gas insulated switchgear according to the present embodiment. As shown in FIG. 1, the gas insulated switchgear 1 includes a metal container (container) 2 filled with an insulating gas (arc-extinguishing gas) such as SF 6 gas, and a three-phase extinguishing device disposed in the metal container 2. And an arc chamber 3. A sealed space 21 is formed in the metal container 2. The sealed space 21 is filled with arc extinguishing gas and is maintained at several atmospheric pressures (for example, 6 atmospheric pressures). The three-phase arc extinguishing chamber 3 is installed in the sealed space 21. The gas insulated switchgear 1 is configured to blow off arc-extinguishing gas instantaneously against arc discharge (arc) generated between electrodes in the arc-extinguishing chamber 3 to instantaneously cut off a large short-circuit current.

  In addition, in the gas insulated switchgear 1 shown in FIG. 1, the case where the arc extinguishing chamber 3 extends in the vertical direction is described for convenience of explanation. However, the configuration of the gas insulated switchgear 1 is not limited to this, and can be changed as appropriate. The present invention can also be applied to the gas insulated switchgear 1 in which the arc extinguishing chamber 3 extends in the horizontal direction.

  Moreover, although the gas insulated switchgear 1 is provided with the three-phase arc-extinguishing chamber 3, it is not specifically limited, For example, you may provide only the one-phase arc-extinguishing chamber 3. FIG.

  Hereinafter, the internal structure of the arc extinguishing chamber 3 will be described with reference to FIGS. 1 and 2. FIG. 2 is an explanatory diagram of the internal structure of the gas insulated switchgear 1 according to this embodiment. 2, the periphery of the electrodes (fixed electrode and movable electrode) shown in FIG. 1 is enlarged. 2A shows a closed state in the gas-insulated switchgear 1, and FIG. 2B shows an open state in the gas-insulated switchgear 1. In FIG. 2, only a part of the movable support 51 is shown for convenience of explanation.

  Each arc extinguishing chamber 3 includes a fixed portion 4 and a movable portion 5 that are arranged to face each other in the vertical direction shown in FIG. 1, and an insulating support 6 that supports the movable portion 5. The fixed portion 4 includes a fixed support 41, a fixed main contact 42, and a fixed arc contact 43. The fixed support 41 has a bottomed cylindrical shape having an upper bottom, and opens downward. An opening 411 is provided on the side surface of the fixed support 41. The fixed main contact 42 is provided in the vicinity of the lower end portion of the fixed support 41 and has a size capable of sliding contact with an outer peripheral surface of a movable main contact 55 described later. The fixed arc contact 43 is supported by a part of the fixed support 41 and is composed of a rod-shaped conductor. The fixed arc contact 43 is provided at the center of the fixed support 41 and is arranged extending in the vertical direction shown in FIG. These fixed main contact 42 and fixed arc contact 43 constitute a fixed contact (fixed electrode).

  On the other hand, the movable portion 5 includes a movable support 51, a puffer cylinder 52, a sliding portion 53, a nozzle 54, and a movable main contact 55. The movable support 51 has a generally cylindrical shape and opens upward and downward. Further, at least one (two in the present embodiment) discharge ports 511 are formed on the side surface of the movable support 51. The puffer cylinder 52 is disposed on the upper end side of the movable support 51. A sliding portion 53 is slidably provided inside the puffer cylinder 52.

  Inside the puffer cylinder 52, a mechanical puffer chamber 521 is formed between the outer periphery of a movable exhaust pipe 56 described later. In addition, a heat puffer chamber 522 is formed inside the sliding portion 53 between a nozzle inner wall portion 542 described later. A communication passage 523 is formed between the sliding portion 53 and the nozzle inner wall portion 542, and a check valve 524 is attached to the communication passage 543 on the heat puffer chamber 522 side (see FIG. 2A).

  As shown in FIG. 2A, the nozzle 54 includes a nozzle outer wall portion 541 and a nozzle inner wall portion 542, and a communication path 543 is formed between the nozzle outer wall portion 541 and the nozzle inner wall portion 542. The nozzle inner wall 542 has a generally cylindrical shape, and is fitted with the other end (upper end) of a movable exhaust pipe 56 described later. On the other hand, the nozzle outer wall portion 541 is fitted and fixed to the upper end portion of the sliding portion 53. The nozzle outer wall 541 is disposed inside the movable main contact 55. The nozzle outer wall portion 541 has a generally funnel shape, and extends upward from the upper surface of the sliding portion 53.

  The movable main contact 55 is provided on the outer peripheral portion of the upper end portion of the sliding portion 53. The movable main contact 55 has a generally cylindrical shape and extends upward from the upper surface of the sliding portion 53. The movable main contact 55 has a dimension that allows sliding contact with the inner peripheral surface of the fixed main contact 42.

  The movable portion 5 includes a movable exhaust pipe 56, a movable arc contact 57, a fixed piston 58, and an insulating operation rod 59.

  The movable exhaust pipe 56 has a generally cylindrical shape. The movable exhaust pipe 56 is inserted into the hollow interior of the movable support 51, the puffer cylinder 52 and the sliding portion 53. Further, a distal end portion of an insulating operation rod 59 described later is connected to one end portion (lower end portion) of the movable exhaust pipe 56 on the insulating support body 6 side through a joint 591. Further, an exhaust hole 561 is formed near one end of the movable exhaust pipe 56, and the hollow interior of the movable exhaust pipe 56 communicates with the hollow portion 512 of the movable support 51. On the other hand, the other end (upper end) of the movable exhaust pipe 56 facing the fixed arc contact 43 supports the movable arc contact 57.

  The movable arc contact 57 has a generally cylindrical shape. The movable arc contact 57 extends in the vertical direction shown in FIG. A hole 571 capable of sliding contact with the fixed arc contact 43 is formed at the upper end of the movable arc contact 57. The movable main contact 55 and the movable arc contact 57 constitute a movable contact (movable electrode).

  As shown in FIG. 2A, the fixed piston 58 has a flange portion 581 attached to a part of the movable support 51 and a piston portion 582 extending vertically in the puffer cylinder 52. The piston portion 582 has a generally cylindrical shape. The piston portion 582 is accommodated in a mechanical puffer chamber 521 in the puffer cylinder 52. The upper end portion of the piston portion 582 has a dimension that allows sliding contact with the inner peripheral surface of the sliding portion 53. The piston portion 582 is formed with a communication passage 583 that allows the mechanical puffer chamber 521 and the hollow portion 512 of the movable support 51 to communicate with each other. A pressure release valve (release valve) 584 is attached to the hollow portion 512 side of the communication path 583. The pressure release valve 584 can suppress a pressure increase in the mechanical puffer chamber 521 beyond a predetermined level.

  One end portion (upper end portion) of the insulating operation rod 59 can project into the hollow portion 512 of the movable support 51 and is connected to the movable exhaust pipe 56, while the other end portion (lower end portion) is an operation mechanism (not shown). Connected to. The insulating operation rod 59 is made of an insulating material such as an epoxy resin, for example. The insulating operation rod 59 moves the sliding portion 53 and the movable exhaust pipe 56 up and down within the movable support 51 and the puffer cylinder 52 in response to the driving force of the operation mechanism. As the movable exhaust pipe 56 moves up and down, the movable arc contact 57 supported by the movable exhaust pipe 56 and the nozzle 54 and the movable main contact 55 provided on a part of the sliding portion 53 can move integrally. It is configured.

  The insulating support 6 is made of an insulating material such as an epoxy resin, for example. The insulating support 6 is disposed on the lower side of the movable part 5. One end portion (lower end portion) of the insulating support 6 is fixed on the fixed base 61 (see FIG. 1), and the other end portion (upper end portion) is fixed to the lower end portion of the movable support 51 of the movable portion 5. Yes. That is, the insulating support 6 supports the movable support 51 from the lower side. The fixed base 61 is configured with a ground potential that is electrically connected to the metal container 2.

  In the gas insulated switchgear 1 according to the present embodiment described above, the movable support 51 is disposed so as to face the fixed support 41 with the puffer cylinder 52 interposed therebetween. In this specification, when two members say "opposite", other members may or may not intervene between them.

  Here, the arc extinguishing principle in the gas insulated switchgear 1 according to the present embodiment will be described with reference to FIGS. FIG. 3 is an explanatory view of the arc extinguishing principle in the gas insulated switchgear 1 according to the present embodiment. FIG. 3 shows a state during arc extinguishing in the gas insulated switchgear 1.

  In the closed state shown in FIG. 2A, the movable exhaust pipe 56 is pushed up by the insulating operation rod 59. With the upward movement of the movable exhaust pipe 56, the sliding portion 53, the nozzle 54, the movable main contact 55, and the movable arc contact 57 are also pushed up. In this case, the fixed main contact 42 is in contact with the outer peripheral surface of the movable main contact 55. The fixed arc contact 43 is inserted into the hole 571 and is in contact with the movable arc contact 57. On the other hand, the fixed piston 58 is fixed to the movable support 51. For this reason, the arc extinguishing gas is introduced (sucked) into the mechanical puffer chamber 521 as the sliding portion 53 moves upward.

  When the closed state shown in FIG. 2A shifts to the open state, the movable exhaust pipe 56 is pulled down by the insulating operation rod 59 as shown in FIG. 2B. As the movable exhaust pipe 56 moves downward, the sliding portion 53, nozzle 54, movable main contact 55, and movable arc contact 57 are also lowered. In the process of downward movement of the sliding portion 53, the movable main contact 55 is separated from the fixed main contact 42 prior to the movable arc contact 57. That is, the movable arc contact 57 is separated from the fixed arc contact 43 at a timing later than the separation of the movable main contact 55 from the fixed main contact 42. For this reason, when the movable arc contact 57 is separated from the fixed arc contact 43, an arc discharge A is generated between the arc contacts 43 and 57 as shown in FIG.

  The arc extinguishing gas in the heat puffer chamber 522 is heated by the heat generated when the arc discharge A occurs, and the pressure in the heat puffer chamber 522 rises rapidly. The arc extinguishing gas is blown to the arc discharge A through the communication path 543.

  Further, as described above, the fixed piston 58 is fixed to the movable support 51. For this reason, as the sliding portion 53 moves downward, the arc extinguishing gas disposed in the mechanical puffer chamber 521 is compressed by the piston portion 582 of the fixed piston 58, and the pressure of the mechanical puffer chamber 521 increases. When the pressure of the heat puffer chamber 522 rises, the check valve 524 that isolates the mechanical puffer chamber 521 and the heat puffer chamber 522 is released, and the compressed arc-extinguishing gas passes through the communication passage 523. It flows into the heat puffer chamber 522, passes through the communication path 523, and is blown to the arc discharge A. Thereby, the arc discharge A generated between the fixed arc contact 43 and the movable arc contact 57 is extinguished.

  In the gas insulated switchgear 1, a hot gas flow is generated as the arc discharge A is extinguished. This hot gas flow is composed of a high-temperature and low-density gas (hereinafter simply referred to as “hot gas”). A part of such a hot gas flow is introduced into the fixed support 41 and cooled, and then discharged from the opening 411 (see FIG. 1) formed in the fixed support 41 into the metal container 2.

  Also, a part of the hot gas flow flows into the other end (upper end) side of the movable exhaust pipe 56, that is, through the hole 571 formed in the movable arc contact 57, and one end of the movable exhaust pipe 56. The gas is exhausted from the (lower end) side, that is, from the exhaust hole 561 to the hollow portion 512 of the movable support 51. Further, the hot gas flow is discharged into the metal container 2 from the discharge port 511 formed in the movable support 51.

  By the way, in the gas insulated switchgear 1 according to the present embodiment, in the hollow portion 512 of the movable support 51, the distal end portion of the insulating operation rod 59 is connected to one end portion of the movable exhaust pipe 56 via the joint 591, and is turned off. The arc chamber 3 is made compact. By adopting such a configuration, it is necessary to consider the flow path of the hot gas flow in the hollow portion 512 of the movable support 51.

  FIG. 4 is an explanatory diagram showing the flow of the hot gas flow in the reference example of the gas insulated switchgear. In FIG. 4, the same components as those in the present embodiment are denoted by the same reference numerals. The arrows in FIG. 4 indicate the hot gas flow.

  In the arc-extinguishing chamber 3 in the conventional gas insulated switchgear 1 shown in FIG. 4, the hot gas flow discharged to the hollow portion 512 through the exhaust hole 561 of the movable exhaust pipe 56 is once applied to the inner wall surface of the movable support 51. It is discharged into the metal container 2 from the discharge port 511 shifted by 90 ° after the collision. However, in addition to the direction of the inner wall surface of the movable support 51, a hot gas flow that flows toward the insulating operation rod 59 directly below may occur. In this case, the vicinity of the distal end portion of the insulating operation rod 59 connected to the movable exhaust pipe 56 and the joint 591 'is directly exposed to the hot gas flow. As the number of shut-off operations increases, the number of times the insulating operation rod 59 is exposed to the hot gas flow also increases, and carbonization of the insulating material constituting the insulating operation rod 59 progresses. As a result, the insulation of the insulating material is lowered, and may not withstand the recovery voltage applied after the interruption, leading to a ground fault.

  On the other hand, when the hot gas flow is discharged into the metal container 2 from the discharge port 511 of the movable support 51, a part of the hot gas flow is divided into the hollow portion 512 of the movable support 51 and the hollow portion 601 of the insulating support 6. In some cases, the air flows into the hollow portion 601 of the insulating support 6 through the openings 602 communicating with each other. In this case, the hot gas flow is sprayed on the insulating material constituting the inner surface of the insulating support 6, so that the insulation is lowered, and the recovery voltage applied after the interruption may not be able to endure, leading to a ground fault.

  The inventors of the present invention have noted that the hot gas flow in the hollow portion 512 of the movable support 51 may cause a decrease in insulation of the insulating material. And it discovered that guiding a hot gas flow from the hollow part 512 of the movable support 51 to the metal container 2 could suppress the occurrence of a ground fault in the gas-insulated switchgear 1, and arrived at the present invention.

  That is, the gist of the gas insulated switchgear 1 according to the present invention is provided with the discharge port 511 for discharging the hot gas flow into the metal container 2 in the movable support 51 and the movable exhaust pipe in the hollow portion 512 of the movable support 51. 56 is to provide a rectifying member that guides the flow of hot gas exhausted from one end side of 56 toward the discharge port 511.

  According to this configuration, the hot gas flow exhausted into the hollow portion 512 of the movable support 51 through the movable exhaust pipe 56 is guided to the discharge port 511 provided in the movable support 51 by the rectifying member. The hot gas flow toward the insulating operation rod 59 and the hollow portion 601 of the insulating support 6 is suppressed. Thereby, carbonization of the insulating material which comprises the insulation operating rod 59 and the insulation support body 6 can be prevented, the fall of these insulation performances can be suppressed, and a ground fault generation | occurrence | production can be suppressed.

  Hereinafter, the rectifying member in the gas insulated switchgear 1 according to the present embodiment will be described. The gas insulated switchgear 1 according to the present embodiment is provided as a rectifying member in the movable exhaust pipe 56 for exhausting the hot gas flow in order to guide the hot gas flow toward the insulating operation rod 59 to the discharge port 511. It is preferable that the first rectifying member is provided on the insulating support 6 side than the exhaust hole 561 formed.

  For example, as shown in FIG. 2A, the gas insulated switchgear 1 includes a tapered surface member 592 having a tapered surface on one end side of the movable exhaust pipe 56 as a first rectifying member.

  FIG. 5 is an explanatory diagram showing the induction of the hot gas flow by the rectifying member in the gas insulated switchgear 1 according to the present embodiment. 5A shows a state where the gas insulated switchgear 1 is viewed from the front, and FIG. 5B shows a state where the gas insulated switchgear 1 shown in FIG. 5A is rotated by 90 ° in the horizontal direction. The arrows in FIG. 5 indicate the hot gas flow.

  As shown in FIG. 5, the hot gas flow exhausted from the exhaust hole 561 to the hollow portion 512 of the movable support 51 through the inside of the movable exhaust pipe 56 is an insulating operation rod connected to one end of the movable exhaust pipe 56. Although it is going to 59, it contacts the taper surface of the taper surface member 592, and is guide | induced to the discharge port 511 (refer FIG. 5B). For this reason, the hot gas flow sprayed on the insulating operation rod 59 is reduced, and carbonization of the insulating material constituting the insulating operation rod 59 can be prevented.

  In the present embodiment, since the tapered surface member 592 is provided at the joint 591, the hot gas flow toward the insulating operation rod 59 connected to one end of the movable exhaust pipe 56 via the joint 591 is discharged to the outlet 511. Can be guided efficiently. However, the tapered surface member 592 as the first rectifying member may be provided on the insulating support 6 side with respect to the exhaust hole 561, and may be a member different from the joint 591.

  Further, the tapered surface member 592 which is an example of the first rectifying member has a substantially circular outer peripheral shape when viewed from the upper side or the lower side in the long axis direction of the movable exhaust pipe 56 and the movable exhaust pipe 56. And substantially concentric. However, the shape of the outer peripheral edge of the movable support 51 of the first rectifying member does not have to be a perfect circle, and may be partially, for example.

  By forming the first rectifying member in such a shape, the hot gas flow can be guided to the inner wall surface of the movable support 51 and further guided to the discharge port 511 along the inner wall surface. Can be prevented more efficiently.

  Further, it is desirable that the tapered surface member 592 as the first rectifying member is moved closer to the fixed support 41 than the end of the discharge port 511 on the insulating support body 6 side as the insulating operation rod 59 is moved.

  In this case, the tapered surface member 592 moves with the movement of the insulating operation rod 59, but is located closer to the fixed support 41 than the end of the discharge port 511 on the insulating support 6 side. 511 can be efficiently guided.

  The tapered surface member 592 as described above is an example of the first rectifying member, and is not limited thereto. For example, the first rectifying member may not have a tapered surface as long as the insulating operation rod 59 is not directly exposed to the hot gas flow.

  The gas insulated switchgear 1 according to the present embodiment reduces the diameter of the opening 602 where the hollow portion 601 of the insulating support 6 and the hollow portion 512 of the movable support 51 communicate with each other as a rectifying member. It is preferable to include a second rectifying member that guides the hot gas flow toward the inside of the hollow portion 601 to the discharge port 511.

  For example, in the gas insulated switchgear 1, as shown in FIG. 2A, a reduced diameter member 62 fitted in the opening 602 is provided as the second rectifying member. The diameter-reducing member 62 is generally cup-shaped, and has a bottom 621 at the end (lower end) on the insulating support 6 side. A slit 622 into which the insulating operation rod 59 is inserted is formed in the bottom 621. On the other hand, the diameter-reducing member 62 has a flange 623 formed at the end (upper end) on the movable support 51 side. Further, the diameter-reducing member 62 has an annular convex portion 624 protruding toward the movable support 51 along the opening on the upper end portion side, and a taper is formed on the outer peripheral surface portion of the annular convex portion 624.

  With such a configuration, the hot gas flow exhausted into the hollow portion 512 of the movable support 51 through the movable exhaust pipe 56 communicates with the hollow portion 601 of the insulating support 6 and the hollow portion 512 of the movable support 51. However, since the reduced diameter member 62 as the second rectifying member is provided in the opening 602, the intrusion of the hot gas flow into the hollow portion 601 of the insulating support 6 is prevented, and the insulating support 6 It is possible to prevent carbonization of the insulating material constituting the. In addition, since the decomposition product generated when the current is interrupted is also received by the reduced diameter member 62, contamination in the hollow portion 601 of the insulating support 6 can be prevented.

  When the annular protrusion 624 as described above is provided in the reduced diameter member 62, the hot gas flow is guided toward the discharge port 511 provided in the movable support 51 by the taper (see FIG. 5A). Therefore, the hot gas flow is prevented from staying near the lower end of the hollow portion 512 of the movable support 51, and the hot gas flow can be efficiently discharged into the metal container 2 from the discharge port 511.

  However, the shape of the diameter-reducing member 62 is not limited to that shown in FIG. 5, as long as the inner diameter of the opening 602 can be reduced.

  FIG. 6 is a top view showing the reduced diameter member 62 in the gas insulated switchgear 1 according to the present embodiment. As shown in FIG. 6, the diameter-reducing member 62 as the second rectifying member is preferably provided with a gap 625 between the slit portion 622 provided in the bottom portion 621 and the insulating operation rod 59.

  By providing the gap 625 as described above, the insulating operation rod 59 can be freely moved by opening and closing operations while suppressing the intrusion of the hot gas flow into the hollow portion 601 of the insulating support 6. Further, even if the insulating operation rod 59 is vibrated in the horizontal direction by the operation mechanism, since the gap 625 is provided, it is possible to prevent the insulating operation rod 59 from colliding with the reduced diameter member 62.

  The reduced diameter member 62 has a plurality of mounting holes 626 formed in the flange portion 623 and is screwed to the movable support 51 with bolts.

  Further, the reduced diameter member 62 as the second rectifying member is preferably made of an insulating material such as Teflon (registered trademark). In this case, it is possible to prevent the electric field distribution on the inner surface of the insulating support 6 from being damaged while suppressing the penetration of the hot gas flow into the hollow portion 601 of the insulating support 6.

  FIG. 7 is an explanatory diagram showing the induction of the hot gas flow by the rectifying member in the gas insulated switchgear 1 according to the present embodiment. 7A shows a state in which the gas insulated switchgear 1 is viewed from the front, and FIG. 7B shows a state in which the gas insulated switchgear 1 shown in FIG. 7A is rotated by 90 ° in the horizontal direction. The arrows in FIG. 7 indicate the hot gas flow.

  In a state where the gas insulated switchgear 1 is completely opened, as shown in FIG. 7, the joint 591 having the tapered surface member 592 as the first rectifying member is insulated and supported by the discharge port 511 formed in the movable support 51. It is preferable to be configured to move to the vicinity of the end on the body 6 side. In this case, since the tapered surface member 592 is integrated with the reduced diameter member 62 as the second rectifying member and guides the hot gas flow to the discharge port 511, the hot gas flow is discharged into the metal container 2 more efficiently. be able to.

  In addition, this invention is not limited to the said embodiment, It can implement variously. In the above-described embodiment, the size and shape of members and holes shown in the attached drawings are not limited to this, and can be appropriately changed within a range in which the effects of the present invention are exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

  For example, in the above-described embodiment, the gas insulated switchgear 1 including both the first rectifying member and the second rectifying member is described as an example of the rectifying member. However, the first rectifying member and the second rectifying member are described. A gas insulated switchgear including any one of the above is also encompassed in the present invention.

According to the gas insulated switchgear of the present invention, to suppress carbonization of the insulating material by Netsuga scan, provide an advantage that it is possible to prevent the occurrence of a ground fault, in particular, extinguishing of a plurality of phases in a metal container It can be suitably used for a puffer type gas insulated switchgear in which a chamber is incorporated.

DESCRIPTION OF SYMBOLS 1 Gas insulation switchgear 2 Metal container 21 Sealed space 3 Arc extinguishing chamber 4 Fixed part 41 Fixed support 411 Opening part 42 Fixed main contactor 43 Fixed arc contactor 5 Movable part 51 Movable support 52 Puffer cylinder 521 Mechanical puffer chamber 522 Thermal puffer Chamber 53 Sliding part 54 Nozzle 541 Nozzle outer wall part 542 Nozzle inner wall part 55 Movable main contact 56 Movable exhaust pipe 561 Exhaust hole 57 Movable arc contact 58 Fixed piston 59 Insulating operation rod 591 Joint 592 Tapered surface member (first rectifying member) )
6 Insulating support 62 Reduced diameter member (second straightening member)
622 Slit part 624 Annular convex part 625 Gap A Arc discharge

Claims (10)

A gas-insulated switchgear that extinguishes the arc discharge generated by blowing the arc-extinguishing gas to an arc discharge generated when the movable arc contact is separated from the fixed arc contact in a container filled with the arc-extinguishing gas,
A fixed support for supporting the fixed arc contact;
A hollow movable support supported by a hollow insulating support disposed in the container and disposed opposite the fixed support;
An insulating operation rod that is inserted into the hollow portion of the insulating support, and whose tip can protrude into the hollow portion of the movable support;
A movable exhaust pipe inserted into the hollow portion of the movable support, connected to the tip of the insulating operation rod at one end thereof, and provided with the movable arc contact at the other end;
The movable exhaust pipe is generated when the arc extinguishing gas is blown to the arc discharge, and the hot gas flowing into the movable arc contact through the inflow hole of the movable arc contact from the one end side of the movable support. It has an exhaust hole for exhausting into the hollow part,
The movable support includes a discharge port for discharging the hot gas into the container,
A hollow portion of the movable support that is provided with a rectifying member provided with a convex portion protruding toward the fixed support side at an end portion on the insulating support side and having a taper formed on an outer surface portion of the convex portion. A gas insulated switchgear characterized by. 2. The gas insulated switchgear according to claim 1 , wherein the rectifying member reduces the diameter of an opening that communicates with the hollow portion of each of the movable support and the insulating support. The gas insulated switchgear according to claim 1 or 2 , wherein the rectifying member is made of an insulating material. A gas-insulated switchgear that extinguishes the arc discharge generated by blowing the arc-extinguishing gas to an arc discharge generated when the movable arc contact is separated from the fixed arc contact in a container filled with the arc-extinguishing gas,
A fixed support for supporting the fixed arc contact;
A hollow movable support supported by a hollow insulating support disposed in the container and disposed opposite the fixed support;
An insulating operation rod that is inserted into the hollow portion of the insulating support, and whose tip can protrude into the hollow portion of the movable support;
A movable exhaust pipe inserted into the hollow portion of the movable support, the distal end portion of the insulating rod is connected to one end portion thereof via a connecting member, and the movable arc contactor is provided to the other end portion; Comprising
The movable exhaust pipe is generated when the arc-extinguishing gas is blown onto the arc discharge, and the hot gas flowing into the interior from an inflow hole provided in the movable arc contact is supplied from the one end side to the arc. It has an exhaust hole to exhaust to the hollow part of the movable support,
The movable support includes a discharge port for discharging the hot gas into the container,
A rectifying member protruding in a radial direction of the movable exhaust pipe with an outer peripheral surface of the connecting member as a base end, including a terminal end side of the base end side of the surface of the fixed support side of the rectifying member; and The surface is inclined toward the insulating support side from the surface orthogonal to the axial direction of the movable exhaust pipe,
A hollow portion of the movable support that is provided with a convex portion projecting toward the fixed support side at an end portion on the insulating support side, and is further provided with another rectifying member having a taper formed on an outer surface portion of the convex portion. A gas insulated switchgear characterized by comprising: 5. The gas insulated switchgear according to claim 4 , wherein the other rectifying member reduces a diameter of an opening communicating with each of the hollow portions of the movable support and the insulating support. 6. The gas insulated switching according to claim 4 or 5 , wherein the rectifying member includes a tapered surface member having a tapered surface that is tapered from the fixed support side toward the insulating support side. apparatus. The rectifying member, the insulation operation with the movement of the rod, claim 6 claim 4, characterized in that to move the outlet said insulating supporting the fixed support side of the end portion of the side of the A gas insulated switchgear according to claim 1. 8. The gas insulated switch according to claim 4, wherein the insulating operation rod and the movable exhaust pipe are connected via a joint, and the rectifying member is provided in the joint. apparatus. The rectifying member has a substantially circular outer peripheral shape when viewed from the upper side or the lower side in the long axis direction of the movable exhaust pipe, and is substantially concentric with the movable exhaust pipe. The gas insulated switchgear according to any one of claims 4 to 8 . The convex portion according to any one of claims 1 to 9, characterized in that provided annularly along the opening formed so as to communicate with the hollow portion of the insulating support on the movable support Gas insulated switchgear.

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