JP2011234463A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-insulated switchgear which has an even more simplified equipment configuration.SOLUTION: A gas-insulated switchgear houses a block equipment element, a first open and close equipment element, and a second open and close equipment element arranged in multiple stages within a conductive vessel in which insulation gas is included. A lighting arrester is positioned on the lower stage of the second open and close equipment element and on the same straight line as a ground switch and a lightning arrester separation device.

Description

  The present invention relates to a structure of a gas-insulated switchgear used for power transmission / distribution and power reception facilities.

  Up to now, a gas-insulated switchgear in which a shut-off device element having a shut-off function and a switching device element having at least one of a disconnecting function and a grounding function are housed in a conductive container filled with an insulating gas has been widely known. It has been. In such a conventional gas-insulated switchgear, a vacuum switch as a shut-off device element and a disconnector as a switching device element are predetermined in a state of extending horizontally in a conductive container filled with an insulating gas. The thing of the structure arrange | positioned in the up-and-down relationship is proposed (for example, refer patent document 1).

  However, in the conventional gas-insulated switchgear as shown in Patent Document 1, the position of the lightning arrester is at the lower part of the lightning arrester disconnecting device, and the position of the bus bar is at the upper part of the disconnector, There are many arrangements of devices in the vertical direction, and there is a problem that the dimension in the height direction of the gas-insulated switchgear increases, and it has been difficult to say that simplification of the device configuration has been thoroughly implemented.

JP 2007-28776 A

  According to the present invention, a lightning arrester is grounded in a case where a breaking device element and a plurality of switching device elements housed in a conductive container filled with an insulating gas in a horizontally extending state are arranged in a predetermined vertical relationship. It is an object of the present invention to provide a gas-insulated switchgear that can achieve further simplification of the equipment configuration by being arranged on the same line as a switch or a lightning arrester disconnecting device.

  In the gas-insulated switchgear according to the present invention, the interrupting device element composed of the respective phase units arranged in parallel as a multiphase configuration in the state of extending in the horizontal direction, and the interrupting device element in the state of extending in the horizontal direction, respectively. A first switching device element composed of phase units arranged in parallel as a multiphase configuration in the upper stage, and phases arranged in parallel as a multiphase configuration in the lower stage of the breaking device element in a state of extending horizontally A gas insulated switchgear in which a second switchgear element comprising a unit is housed in a conductive container filled with an insulating gas in a multi-stage arrangement, and a lightning arrester is connected to a ground switch in a lower stage of the second switchgear element And it arrange | positions on the same straight line as the lightning arrester disconnecting device.

  According to the gas-insulated switchgear of the present invention, by arranging the lightning arrester on the same straight line as the ground switch and the lightning arrester disconnecting device, the space in the height direction can be reduced and the switchgear structure can be further compacted. It is. In addition, it is not necessary to provide a lightning arrester separating device separately from the ground switch, and it can be configured as one unit, so that the operation mechanism can be simplified.

It is a sectional side view which shows the structure of the gas insulation switchgear which concerns on Embodiment 1 of this invention. It is the elements on larger scale which show the attachment structure of the lightning arrester installed in the lowest stage of the gas insulation switchgear of FIG. It is the elements on larger scale which show the modification of the attachment structure of the lightning arrester which concerns on Embodiment 2 of this invention. It is the elements on larger scale which show the other modification of the attachment structure of the lightning arrester which concerns on Embodiment 3 of this invention.

Embodiment 1 FIG.
Embodiments according to the present invention will be described below. 1 is a right sectional view of a gas-insulated switchgear according to Embodiment 1. FIG.
In FIG. 1, a gas-insulated switchgear main body 1 contains two metal-made sealed containers 2 and 3, and the upper sealed container 2 has a disconnector 5 and a ground switch 6 connected to a bus 4. Is stored. Although not shown in the drawing, the disconnecting switch 5 and the grounding switch 6 extending in the horizontal direction are arranged in parallel in the width direction of the gas-insulated switchgear main body 1 (the depth direction of the paper) at a predetermined interval. Consists of minute multiphase units. Reference numeral 7 denotes an operation mechanism unit for the disconnector 5 and the ground switch 6.

  Further, the lower airtight container 3 has a configuration in which a breaker element and a plurality of switchgear elements are arranged in a predetermined vertical relationship. Here, the breaker 8 is in the upper stage, the disconnecting switch 9 and the ground switch 10. Is a three-stage configuration in which the horizontal arrangement of the lightning arrester 11, the earthing switch 12, and the lightning arrester disconnecting device 13 is arranged in the lower stage. Each horizontal arrangement is constituted by a multi-phase unit for three phases arranged in parallel at a predetermined interval in the width direction of the gas-insulated switchgear main body 1 (depth direction of the paper surface) as described above.

Reference numeral 14 denotes an operation mechanism part of the circuit breaker 8, 15 denotes an operation mechanism part of the disconnector 9 and the earthing switch 10, and 16 denotes an operation mechanism part of the lightning arrester 11, the earthing switch 12 and the lightning arrester disconnecting device 13. The two sealed containers 2 and 3 are filled with an insulating gas, and the disconnectors 5 and 9 are both direct acting disconnectors. A gas partition spacer 19 is disposed at the opposing portion of the two sealed containers 2 and 3, and the cable is sealed therein. Reference numeral 20 denotes a connection conductor for connecting the gas section spacer 19 and the circuit breaker 8, 21 for connecting the circuit breaker 8 and the disconnecting switch 9, and 22 for connecting the disconnecting switch 9 and the grounding switch 12.

  In such a configuration, electric power is input from the power cable 17, sent to the inside of the lower sealed container 3 through the cable head 18, and branched at the disconnector 9, one of which passes through the circuit breaker 8 and is sealed on the upper side. It is sent to the container 2 and sent to the bus bar 4 via the disconnector 5 inside the upper sealed container 2. The other branch of the disconnector 9 is connected to a grounding switch 12 and a lightning arrester disconnecting device 13 via a connection conductor 22, and the grounding switch 12 and the lightning arrester disconnecting device 13 are linear with the lightning arrester 11. Horizontally arranged.

  As described above, according to the present invention, the lightning arrester 11 is arranged on the same straight line as the ground switch 12 and the lightning arrester disconnecting device 13, so that the conventional gas-insulated switchgear described in Patent Document 1 is provided. Therefore, there is no need for a space in the height direction for the arrangement of the lightning arrester, and a compact switchgear can be realized in the height direction. Further, since the operation mechanism of the ground switch and the lightning arrester disconnecting device can be made common, the number of operation mechanisms can be reduced and the simplification of the configuration can be promoted.

  FIG. 2 is a partial enlarged cross-sectional view for explaining a configuration example for arranging the lightning arrester on the same straight line as the earthing switch and the lightning arrester disconnecting device, and (A) and (B) show the state before and after the installation of the lightning arrester. ing. In the figure, the lower airtight container 3 has a hole 3 a in the installation portion of the lightning arrester 11. The lightning arrester 11 has a structure having a contact plate 24 with the lightning arrester disconnecting device 13 at one end and a mounting plate 25 having a handle 30 at the other end. A contact 26 is attached.

As shown in FIG. 2A, when installing the lightning arrester, it is inserted into the container through the hole 3a from the outside of the sealed container 3. FIG. 2B shows a state after the lightning arrester is installed. The lightning arrester 11 is inserted into the recess 13a of the lightning arrester disconnecting device 13 so as to press the disc spring 26, and in this state, the mounting plate 25 is moved to the lower sealed container 3. It is fixed to an appropriate means (not shown) such as a screw.
In this manner, the lightning arrester 11 can be easily attached or detached via an elastic contact such as a disc spring 26, and even if there is an attachment tolerance between the lightning arrester and the lightning arrester disconnecting device, it can be attached without any problem.

Embodiment 2. FIG.
FIG. 3 is a partially enlarged view showing a modification of the lightning arrester mounting structure according to Embodiment 2 of the present invention, and (A) and (B) show the state before and after installation of the lightning arrester. In the figure, the same reference numerals as those in FIG. 2 denote the same or corresponding parts. 3 differs from FIG. 2 in that a coil spring 27 is employed instead of the disc spring 26 of FIG. The coil spring 27 is attached to the recess 13a of the lightning arrester separating device 13, and the lightning arrester 11 is inserted so as to press it. Even if configured in this manner, the same effect as in the first embodiment is obtained.

Embodiment 3 FIG.
FIG. 4 is a partially enlarged view showing another modification of the lightning arrester mounting structure according to Embodiment 3 of the present invention, and (A) and (B) show the state before and after installation of the lightning arrester. In the figure, the same reference numerals as those in FIG. 2 denote the same or corresponding parts. 4 differs from FIG. 2 in that a ring-shaped spring 28 is employed instead of the disc spring 26 of FIG. The ring-shaped spring 28 is provided with a ring-shaped groove on the outer periphery of the annular portion of the contact terminal 24 and is fixed so as to be fitted into the groove. Of course, the groove may be formed on the inner periphery of the annular portion of the recess 13a of the lightning arrester disconnecting device 13.

As described above, according to the embodiment of the present invention, since the lightning arrester can be arranged on the same straight line as the ground switch and the lightning arrester disconnecting device, the height direction space can be reduced and the switchgear structure can be further downsized. Can be achieved.
Further, since the lightning arrester 11 can be attached or detached from the outside via an elastic contact such as a disc spring 26 and a coil spring 27, the lightning arrester 11, the earthing switch 12, and the lightning arrester disconnecting device 13 are arranged in the same straight line. In addition, there is an effect that even if there is an installation tolerance between the lightning arrester and the lightning arrester disconnecting device, it can be installed without any problem.

1 switchgear body, 2 upper sealed container, 3 lower sealed container,
4 busbars, 5, 9 disconnect switch, 6, 10, 12, 16 grounding switch,
7, 14, 15, 16 Operation mechanism, 8 Circuit breaker, 11 Lightning arrester,
13 lightning arrester disconnecting device, 17 power cable, 18 cable head,
24 contact terminal, 25 mounting plate, 26 disc spring,
27 Coil spring, 28 Ring spring, 30 Handle.

Claims (5)

A breaking device element composed of each phase unit arranged in parallel as a multi-phase configuration in a state extending in the horizontal direction, and a multi-phase configuration arranged in the upper stage of the breaking device element in a state extending in the horizontal direction, respectively. A first switchgear element composed of each phase unit, and a second switchgear element composed of each phase unit arranged in parallel as a multiphase configuration in the lower stage of the shutoff device element in a horizontally extending state, respectively In a gas-insulated switchgear that is housed in a conductive container filled with insulating gas in a multi-stage arrangement, a lightning arrester is arranged on the same line as a ground switch and a lightning arrester disconnection device at the lower stage of the second switchgear element. Gas insulated switchgear characterized by When arranging the lightning arrester on the same straight line as the earthing switch and the lightning arrester disconnecting device, the lightning arrester was detachably attached to the lightning arrester disconnecting device installed inside the switchgear main body through an elastic contactor. The gas insulated switchgear according to claim 1. The gas-insulated switchgear according to claim 2, wherein the elastic contact is a disc spring attached to a recess of the lightning arrester disconnecting device. The gas-insulated switchgear according to claim 2, wherein the elastic contactor is a coil spring attached to a recess of the lightning arrester disconnecting device. 3. The gas insulated switchgear according to claim 2, wherein the elastic contact is a ring-shaped spring attached to the outer periphery of the annular portion of the lightning arrester or the inner periphery of the annular portion of the recess of the lightning arrester disconnecting device.

Images