JPH08265925A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE: To obtain a gas insulated switchgear comprising an arrester and a section for disconnecting the arrester from the power supply side, disposed in a tank, wherein the overall size is reduced by simplifying the structure of disconnecting section. CONSTITUTION: A disconnecting section D comprising a fixed contact 5 and a movable contact is formed on the power supply side of an arrester 1. The fixed side contact 5 is fixed to the upper part of a tank through a supporting insulator 2 whereas the movable side contact is disposed on the power supply side of the arrester 1. The disconnection section is opened/closed by moving a straight advance sliding shaft 6, disposed on the ground side, up and down through a straight advance operating means 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated switchgear, and more particularly to a gas-insulated switchgear in which a lightning arrester is installed and which has a disconnecting section for disconnecting the lightning arrester from the power supply side.

[0002]

2. Description of the Related Art FIG. 3 is a single-line connection diagram of a bushing retracting and bushing pulling-out type composite opening / closing device. The drawing unit 30, the opening / closing device unit 40, and the drawing unit 50 are shown.
It is composed of The pull-in unit 30 is a bus bar 3
1, a bus current transformer 32, a voltage transformer 33, a lightning arrester 34, and a disconnecting portion 35 for separating the lightning arrester 34 and the busbar 33. The equipment of each of these units is housed in a sealed tank, and SF ₆ etc. is placed inside the tank. Insulating gas is filled.

In the figure, ES is a grounding switch, DS is a disconnecting switch, CB is a gas circuit breaker, and BU is a bushing.

The lightning arrester 34 is required to be disconnected from the bus bar in order to pass a current at a voltage exceeding the rating of the line at the time of withstanding voltage test due to its characteristics. Since this disconnection is performed without removing the insulating gas in the tank, the arrester 34 and the bus bar 3
A disconnecting portion 35 such as a disconnector is provided between the disconnecting portion 35 and the connector 1.

FIG. 4 shows a conventional disconnection mechanism for disconnecting the arrester from the busbar. In the same figure, 41 is a disconnector main body, 42 is a disconnector main body supporting metal fitting, the lower part is vertically fixed to the tank bottom plate 44 of the tank 43 of the retracting unit 30, and the upper support is provided with two support insulators 45, 46. ,
The support insulator 45 supports the disconnector main body 41, and the other support insulator 46 supports the conductor 47 of the busbar.

Reference numeral 48 denotes a fixed side contact of a disconnection portion provided on the bus bar conductor 47, which is shielded by a shield member. Reference numeral 49 denotes a movable-side conductor of the disconnecting portion 35, the tip of which is slidably contacted with the fixed-side contact 48 to be inserted and separated. Further, the operating mechanism 50 is provided on the other end side of the movable conductor 49.
The operation insulating rod 51 is provided to move the movable conductor 49 in the horizontal direction (the direction in which the movable contact 49 is inserted / removed into / from the fixed contact).

The operating mechanism 50 includes an operating rod 5 which is operated up and down by an operating portion 52 from the outside of the tank bottom plate 44.
2 ', by the vertical movement of the operating rod 52', the operating shaft 5
4 is composed of an operating lever 53 which is rotated around 4, and an operating insulating rod 51 whose one end is connected to the operating shaft 54 and whose other end is engaged with the movable side conductor 49. The operating rod 52 ′ is moved downward. Then, the movable-side conductor 49 is separated from the fixed-side contact 47 (disconnection).

Reference numeral 55 denotes an operation support fitting for supporting the operation shaft 54, which is provided on the support member 56 and supports the operation shaft 54.

57 is a lightning arrester, and this lightning arrester 57 is ZnO.
Since the elements are stacked and supported around the insulating rod of epoxy resin and cannot support the mass of the disconnector main body 41, they are supported by the supporting member 56 or fixedly fixed to the tank bottom plate, and one end side of the disconnector main body. 41 is connected.

[0010]

In the retracting unit of this type, as described above, since the arrester body cannot support the disconnector body as described above, the disconnector body supporting metal fittings and the operating shaft support which support the disconnector body and the operating shaft are supported. Metal fittings are provided to support the disconnector body and the operating shaft. Therefore, these support fittings occupy the space in the tank, which is an obstacle to downsizing the entire gas-insulated switchgear. For this reason, it has been difficult to fit within the transportation limit size for full-package transportation.

Further, the number of constituent parts of the entire disconnecting section is increased, which has been a factor of increasing the product price.

In view of the above points, it is an object of the present invention to reduce the size of the entire device by eliminating the need for a conventional disconnector main body, a disconnector main body supporting bracket for supporting the disconnector main body, and an operating shaft supporting bracket for supporting the operating shaft. To do.

[0013]

Means for Solving the Problems In the present invention, a means for solving the above-mentioned problems is to provide a gas insulation provided with a lightning arrester and a disconnecting portion for disconnecting the lightning arrester from the power supply side in a tank filled with an insulating gas. In the opening / closing device, the disconnecting portion is
It consists of a fixed side contact and a movable side contact that turns on and off with the fixed side contact, the fixed side contact is attached to the upper part of the tank via a support insulator, and the movable side contact is provided on the power supply side of the lightning arrester body,
A straight advance sliding shaft is provided on the grounding side of the arrester body, and the free end side of the sliding shaft is hermetically penetrated through the tank bottom plate via a sliding bearing. The lightning arrester body is moved up and down by operating the straight-moving operation means so that the movable side contact is closed / opened to / from the fixed side contact.

It is preferable that the movable contact has a positioning hole and the fixed contact has a positioning pin to be inserted into the positioning hole.

The straight-moving operation means is a guide rod screwed adjacent to a sliding shaft on the outer side of the bottom of the tank, and the guide rod is inserted into the guide rod and guided by the guide rod. A guide plate that moves the moving shaft up and down, a guide rod fixing plate that is provided on the free end side of the guide rod and has a threaded portion in the center, and is screwed into the threaded portion of the guide rod fixing plate, and the tip turns to the guide plate. It is characterized in that it is formed by a disconnection operation screw rod rotatably supported.

[0016]

As described above, according to the present invention, since the lightning arrester main body is provided with the disconnecting section, and the lightning arrester main body is directly linearly interlocked and separated from the power source side (bus bar), the conventional disconnector main body,
This eliminates the need for a disconnecting switch main body support metal for supporting this, an operating mechanism for operating the disconnecting switch, and a supporting metal for supporting this.
Since the space occupied by the equipment in the tank is eliminated, the whole device is made very compact.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is characterized in that a disconnector main body, a disconnector main body supporting metal fitting for supporting the main body, an operating shaft and an operating shaft supporting metal, which have been conventionally provided, are not required.

The present invention will be described below based on an embodiment shown in the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, in which FIG. 1 (a) is a front view of the tank 3 cut away, and FIG. 1 (b) is an enlarged view of part A of FIG. 1 (a). There is.

In FIG. 1, 1 is a lightning arrester body, 2 is a support insulator for supporting the lightning arrester body 1, and the support insulator 2 has its upper end attached to a support insulator attaching member 4 provided on the upper portion of the tank 3 and its lower end. Supports the upper end side (power source side) of the lightning arrester body 1 via the disconnection portion D. A straight-moving sliding shaft 6 is provided on the lower end side of the lightning arrester body 1, and the sliding shaft 6 penetrates a bottom plate 7 of the tank in an airtight manner and is slidably led out of the tank. When this is led out, an insulating flange 8 is provided on the bottom plate 7 in order to electrically insulate the sliding shaft 6 from the bottom plate 7.
A sliding bearing 9 is attached to the insulating flange 8 to slidably support the sliding shaft 6. 10 is a holding plate for the insulating flange 8, 11 is a mounting plate, and 12 is a ground conductor.

A movable side contact 1a is provided at the upper end of the lightning arrester body 1 and a contact piece 5a of the fixed side contact 5 is provided.
It is possible to connect and disconnect with. Then, the entire lightning arrester body 1 can be moved up and down by a straight-ahead operation means described later.

The fixed contact 5 is a contact piece 5a.
And a metal supporting member 5 for supporting the contact piece 5a.
b, a spring 5c that presses one end side of the contact piece 5a to the support member 5b and the movable side contact 1a, the spring 5d that presses the other end of the contact piece 5a to the movable side contact 1a, a fixed side contact 5 And a shield pin 5e that shields the movable contact 1a.
It is inserted in the guide hole 1b provided in a.

The fixed side contact 5 and the movable side contact 1a form a disconnection portion 35 shown in FIG. The metallic support member 5b of the fixed-side contact 5 and the conductor 31 of the busbar (see FIG. 3) are connected by the connection conductor 13.

In FIG. 1A, the same reference numerals as those in FIG. 3 denote the same parts, and 14 denotes the connection conductor of the voltage transformer 33.

FIG. 2 is a block diagram of an embodiment of the straight-ahead operation means of the lightning arrester main body 1. FIG. 2 (a) shows the connecting operation position of the disconnecting section, and FIG. 2 (b) shows the disconnecting operation position.

In these figures, 21 is a guide plate,
Ground conductor 12 at the tip of sliding shaft 6 for straight advance of lightning arrester body 1
It is attached to the screw part for attaching. The guide plate 21 has a hole through which the guide rod 22 penetrates. One end of the guide rod 22 can be screwed into the bottom plate 7 of the tank by inserting it through the hole of the guide plate 21, and the other end side of the guide rod fixing plate 2
Fixed to 3. A screw hole portion 24 is provided at the center of the guide rod fixing plate 23. Reference numeral 25 is a disconnection operation screw rod, and 26 is a thrust bearing portion. The disconnection operation screw rod 25 is screwed into a screw hole portion 24 of the guide rod fixing plate 23, and its tip is rotatably attached to the thrust bearing portion 26. It is pivotally supported. The thrust bearing portion 26 is supported by the guide plate 21 via a bearing support plate 27 and a mounting seat 28. Therefore, when the disconnection operation screw rod 25 is rotated clockwise, the screw rod 25, the bearing support plate 27 attached to the tip of the screw rod 25, and the mounting seat 2 are attached.
The guide plate 21 is moved downward in FIG. 8 via 8, and the arrester body 1 is also moved straight downward via the sliding shaft 6 accordingly.

This straight advancing operation means is always the bottom plate 7 of the tank.
It may be attached to the
Attach and operate only when operating the disconnector.

For example, in the case of disconnecting the disconnection section, the case shown in FIG.
As shown in (a), the guide plate 21 is attached to the tip of the sliding shaft 6, and the guide rod 22 is inserted into the hole of the guide plate 21,
One end thereof is screwed and fixed to the bottom plate 7 of the tank. In this case, the guide rod 22 may be first fixed to the tank bottom plate 7, and then the guide plate 21 may be attached to the tip of the sliding shaft 6.

Next, the guide rod fixing plate 23 is attached to the free end side of the guide rod 22, and the screw hole portion 2 of the fixing plate 23 is attached.
A threaded rod 25 for disconnecting operation is screwed into 4 and its tip is attached to the guide plate 21 via a thrust bearing portion 26.

Then, the bolt 21 'fixing the mounting plate 11 is removed, and the disconnection operating screw rod 25 is manually or electrically operated to rotate. As the screw rod 25 rotates, the lightning arrester body 1 is moved downward via the sliding shaft 6, and the state shown in FIG. 2 (b) is reached. The movable side contact 1a is separated from the fixed side contact 5 and is disconnected. .

To change from the disconnection state to the closed state, the disconnection operation screw rod 25 is rotated in the opposite direction to the case of the disconnection. When the movable-side contact 1a is inserted into the contact piece 5a of the fixed-side contact 5, the positioning pin 5e of the fixed-side contact 5 is inserted into the guide hole 1b of the movable-side contact 1a, so that the movable-side contact moves straight when it is closed. The power source side of the arrester body 1 is fixed while forming a guide.

Further, the positioning pin reliably holds against the shake during transportation, the shake during an earthquake, and the acting force due to the electromagnetic force at the time of passing current, and excessive cores to the contact on the fixed side and the movable side. Prevents deviation.

[0033]

As described above, according to the present invention, the conventional disconnector main body, the disconnector main body supporting metal fitting for supporting the disconnector main body, the operating mechanism for operating the movable side conductor of the disconnector main body, and the support thereof. Since metal fittings are no longer required, the entire gas switchgear can be made extremely compact, and it is possible to transport the entire equipment. Also, the number of parts that make up the disconnection part can be reduced, and the product cost can be reduced. .

Further, by inserting the positioning pin of the fixed side contact into the guide hole of the movable side contact of the lightning arrester body, the power source side of the lightning arrester body is securely fixed, and vibration during transportation, vibration during earthquakes and current flow The effect of reliably holding against the acting force of the electromagnetic force is exhibited.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of an embodiment of a disconnecting section operating means of the present invention.

FIG. 3 is a single wire connection diagram of the gas insulated switchgear.

FIG. 4 is an explanatory view of the inside of a conventional retracting unit.

[Explanation of symbols]

 1 ... Lightning arrester body 2 ... Support insulator 3 ... Tank 4 ... Support insulator mounting member 5 ... Fixed side contact 6 ... Sliding shaft 7 ... Tank bottom plate 8 ... Insulation flange 9 ... Sliding bearing 10 ... Insulation flange retainer plate 11 ... Mounting Plate 12 ... Ground conductor 13 ... Connection conductor 20 ... Straight advance operation means 21 ... Guide plate 22 ... Guide rod 23 ... Guide rod fixing plate 24 ... Screw portion 25 ... Disconnection operation screw rod 26 ... Thrust bearing portion

Claims (3)

[Claims] 1. A gas-insulated switchgear comprising a lightning arrester and a disconnecting section for disconnecting the lightning arrester from a power supply side in a tank filled with insulating gas, wherein the disconnecting section includes a fixed contact and a fixed contact.・ It consists of a movable side contact that is disconnected.The fixed side contact is attached to the upper part of the tank via a support insulator, the movable side contact is provided on the power supply side of the lightning arrester body, and a straight line slide is installed on the ground side of the lightning arrester body. A moving shaft is provided, and the free end side of the sliding shaft is hermetically penetrated through the tank bottom plate via a sliding bearing, and the penetrating sliding shaft is operated from the outside of the tank by a straight-ahead operation means to move the lightning arrester body up and down. Move the movable side contact into the fixed side contact.
A gas-insulated switchgear characterized by being disconnected. 2. The gas-insulated switchgear according to claim 1, wherein the movable contact is provided with a positioning hole, and the fixed contact is provided with a positioning pin to be inserted into the positioning hole. 3. The straight-moving operation means includes a guide rod screwed adjacent to a slide shaft on the outer side of the tank bottom, and a guide rod inserted through the guide rod and guided by the guide rod. A guide plate that moves the moving shaft up and down, a guide rod fixing plate that is provided on the free end side of the guide rod and has a threaded portion in the center, and is screwed into the threaded portion of the guide rod fixing plate, and the tip turns to the guide plate. 3. A gas-insulated switchgear according to claim 1 or 2, characterized in that it is formed with a disconnection-operation screw rod that is rotatably supported.