KR101904882B1 - Switching mechanism for gas insulated switchgear - Google Patents

Abstract

The present invention provides an opening/closing device for a gas insulated switchgear, which has an efficient usage of driving energy, does not require an operating device of a large output, and improves the construction of a driving shaft to enhance assembly productivity. According to the present invention, the opening/closing device comprises: a disconnector fixed contactor; a ground switchgear fixed contactor; a first movable contactor movable to a position in contact with the disconnector fixed contactor and a position separated from the disconnector fixed contactor; a second movable contactor movable to a position in contact with the ground switch fixed contactor and a position separated from the ground switch fixed contactor; a driving shaft connected to a driving source to provide a rotational driving force, including a first shaft portion and a second shaft portion capable of being separated from and coupled to each other, and rotatable in a clockwise direction or a counterclockwise direction; a power transmission mechanism for converting the rotational driving force of the driving shaft into a linear driving force to selectively transmit the converted driving force to the first movable contactor or the second movable contactor; a first electronic device electrically connected to a power circuit, the first movable contactor, and the second movable contactor; and a second electronic device electrically connected to the power circuit and the disconnector fixed contactor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a gas insulated switchgear,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching mechanism of a gas insulated switchgear (GIS). More particularly, the present invention relates to a switching device for a common switching device of a earthing switch and a disconnection switch, mechanism and a driving shaft included in the switching device.

In order to safely supply the power generated by the power plant to the customers of general power, ultra-high pressure gas insulated switchgear is installed and operated in each substation.

This ultra high pressure gas insulated switchgear has a rated voltage ranging from several tens of kilovolts (kV) to hundreds of kilovolts, for example, a circuit breaker installed in a tank (enclosure) enclosed with an insulating gas such as sulfur hexafluoride (SF6) A high speed earthing switch, a bushing unit, and the like.

The present invention relates to such an ultra-high pressure gas insulated switchgear (hereinafter, abbreviated as a gas insulated switchgear), and more particularly to a common switchgear of a ground switch and a disconnecting switch and a drive shaft included in the switchgear.

1 to 3, a conventional open / close device (hereinafter abbreviated as an open / close device) and a drive shaft of the earthing switch and disconnecting switch of the gas insulated switchgear will be described with reference to FIG.

1 is a cross-sectional view showing a configuration of an opening / closing device in a gas insulated switchgear according to the related art, and is a sectional view of a switchgear in a neutral state (position), and Fig. 2 is a cross- FIG. 3 is a perspective view showing the structure of a drive shaft among the open / close devices in the conventional gas insulated switchgear. FIG.

1 to 3, in the gas insulated switchgear according to the related art, the opening / closing device SM1 includes a disconnecting fixed contact 1, a first movable contact 2, a first contactor 3, a drive lever 4, A first link 5, a ground contact fixed contact 6, a drive shaft 7, a second movable contact 8, and a second link 9.

When the gas insulated switchgear is for three-phase alternating current, three switching devices SM1 may be provided corresponding to three phases of AC, and each switching device SM1 may include one of the components.

However, the enclosure H and the first cover plate P1, the second cover plate P2 and the third cover plate P3 are provided in common to the three opening / closing apparatuses SM1.

The configuration of the plurality of phase-change switching devices SM1 is the same, so that the detailed configuration of the switching devices SM1 will be described below.

The disconnector fixed contact 1 is a fixed contact electrically connected to the power supply side or the load side of an ultra high voltage power circuit (abbreviated as power circuit hereinafter).

The ground contactor fixed contact 6 is a fixed contact electrically connected to the ground.

The first movable contactor 2 is provided so as to face the disconnector fixed contact 1 as shown and has a connecting position for contacting the disconnector fixed contact 1 to bring the power circuit into a closing position and a disconnection position for disconnecting the power circuit from the disconnector fixed contact 1 so that the power circuit is in an opening position.

The second movable contactor 8 is provided so as to face the ground contactor fixed contact 6 as shown in the drawing and contacts the ground contactor fixed contact 6 to make the power circuit grounded, To a ground disconnecting position which separates the power circuit from the ground disconnecting status and thus separates it from the ground. Do.

The first conductor 3 is a means for movably supporting the first movable contactor 2 at the connection position or the disconnecting position and for electrically connecting the first movable contactor 2 to the power circuit.

The first conductor 3 may be constituted by an approximately "V" shaped body portion having an internal hollow portion and a rod-shaped extended conductor portion extending from the body portion. The first electric conductor 3 is electrically And is formed of a conductive material.

When the disconnector fixed contact 1 is electrically connected to the power supply side of the power circuit, the first conductor 3 is electrically connected to the load side of the power circuit, and the disconnector fixed contact 1 is connected to the load The first conductor 3 is electrically connected to the power supply side of the power circuit.

The drive lever 4 is a lever having one end connected to the drive shaft 7 and the other end connected to the first movable contactor 2 and the second movable contactor 8, And drives the first movable contactor 2 or the second movable contactor 8 while rotating in the same direction.

The drive lever 4 is located at the central portion of the body portion of the "V" shape of the first conductor 3.

 The first movable contact 2 connected to the drive lever 4 via the first link 5 rotates in the clockwise direction when the drive shaft 7 is rotated in the clockwise direction in the figure, It can be moved closer to the disconnector fixed contact 1 and contact the disconnector fixed contact 1. At this time, the second movable contact 8, which is connected to the drive lever 4 via the second link 9, moves in a direction away from the corresponding earthing switch fixed contact 6.

When the drive shaft 7 rotates counterclockwise in the figure, the first movable contact 2 connected to the drive lever 4 through the second link 9 while the drive lever 4 is also rotated counterclockwise It can move toward the corresponding earthing switch fixed contact 6 and come into contact with the earthing switch fixed contact 6. At this time, the first movable contact 2, which is connected to the drive lever 4 via the first link 5, moves in a direction away from the corresponding disconnector fixed contact 1.

The first link 5 is a link having one end connected to the first movable contactor 2 and the other end connected to the drive lever 4 to convert the rotational motion of the drive lever 4 into a linear motion, To the movable contactor (2).

The second link 9 is a link having one end connected to the second movable contactor 8 and the other end connected to the drive lever 4 so as to convert the rotational motion of the drive lever 4 into a linear motion, To the movable contactor (8).

3, the drive shaft 7 includes a single rod 7a integrally connected in a straight line, and a rod 7a which is covered on the surface of the rod 7a, And a plurality of insulating clad portions 7b formed in plural.

 A portion of the rod 7a is exposed at three positions between adjacent ones of the insulating cladding portions 7b of the plurality of insulating cladding portions 7b and the corresponding drive lever 4 is exposed to the exposed portion of the rod 7a. Can be connected.

One end of the drive shaft 7 is connected to an actuator (not shown) for driving and the other end of the drive shaft 7 can be supported by a bearing (not shown) provided in the enclosure H.

1 to 3, reference numerals 1a, 1b and 1c designate a second conductor. Among them, the second conductor denoted by reference numerals 1a, 1b and 1c may be composed of a conductive rod which supports the disconnecting contact 1 and a conductive rod which is formed of a conductive material which can be electrically connected to the power circuit .

Reference numeral 3a denotes a first guide opening portion of the first conductors 3. The first guide hole 3a is formed at a position facing the disconnector fixed contact 1 of the first electric conductor 3 so as to guide the linear movement of the first movable contactor 2, Is formed to extend linearly by a predetermined length so as to have a constant inner diameter which is larger by a predetermined margin.

Reference numeral 3b denotes a second guide opening portion of the first engager 3. The second guide hole 3b is provided at a position facing the earthing switch fixed contact 6 of the first electric conductor 3 so as to guide the linear movement of the second movable contactor 8, Is formed by extending a predetermined length linearly so as to have a constant inner diameter larger than the diameter by a predetermined margin.

3c designate the power circuit connection engager part. The power circuit connection conductor portion 3c may be formed separately from the first conductor 3 as a conductor portion for connecting the first conductor 3 to the power circuit and connected to the first conductor 3 by bolts.

H designates an enclosure in the form of a tank, which is formed of, for example, iron and has an open top and a bottom and is open at one side so as to accommodate the above-mentioned components of the opening / closing apparatus SM1, 11 can be referred to.

The enclosure H accommodates the above-mentioned constituent parts of the opening / closing apparatus SM1 inside with the insulating gas sealed therein.

Reference numeral P1 designates a first cover plate which closes the lower opening portion of the enclosure H in the drawing.

Reference numeral P2 designates a second cover plate which closes the upper opening portion of the enclosure H in the figure.

Reference numeral P3 designates a third cover plate which closes the lateral opening portion of the enclosure H in the figure.

The operation of the opening / closing apparatus SM1 according to the related art constructed as described above will be briefly described.

1, when the drive lever 4 is rotated by a predetermined angle in the clockwise direction by rotational power transmission from a manipulator (not shown), one end of the drive lever 4 is connected to the first link 5 The first movable contact 2 connected via the first movable contact 2 advances to the position shown in Fig. The power circuit in which the first movable contactor 2 is connected to the first movable contactor 2 through the first electric conductor 3 by contact with the disconnector fixed contact 1 and the second electric contactor 2 connected to the disconnector fixed contactor 1, The power circuit connected through the conductors 1a, 1b and 1c is closed and becomes conductive.

On the other hand, in the state shown in Fig. 2, when the drive lever 4 is rotated counterclockwise by a predetermined angle by the rotation power transmission from the manipulator (not shown), one end of the drive lever 4, The first movable contact 2 connected via the second contact 5 retracts to the neutral position shown in Fig. The power circuit to which the first movable contactor 2 is disconnected from the disconnector fixed contact 1 and is connected to the first movable contactor 2 via the first electric conductor 3 and the power circuit to which the second movable contactor 2 is connected to the disconnector fixed contactor 1, The power circuit connected through the conductors 1a, 1b and 1c is disconnection.

On the other hand, in the state shown in Fig. 1, when the drive lever 4 is rotated counterclockwise by a predetermined angle by the rotation power transmission from the manipulator (not shown), one end of the drive lever 4 is connected to the second link The second movable contact 8 connected via the second movable contact 9 advances. The power circuit to be connected to the second movable contactor 8 via the first electric conductor 3 by the second movable contactor 8 contacting the ground contactor fixed contact 6 and the ground contactor fixed contactor 6 The connected ground is connected to the ground state.

However, in the opening / closing device SM1 according to the related art constructed and operated as described above, the first movable contactor 2 as the movable contactor for the disconnector and the second movable contactor 8 as the movable contactor for the earthing switchgear, (5) and the second link (9).

The second movable contactor 8, which is a movable contactor for the earthing switch, moves together, and the first movable contactor 2, which is also a movable contactor for the disconnecting switch, moves together when the earthing switch is in operation.

Therefore, since the other movable contacts unnecessary for driving one movable contactor are also driven together, the opening / closing apparatus SM1 according to the related art has a problem in that the use of driving energy is inefficient and unnecessarily large output manipulator is required have.

Further, since the opening / closing apparatus SM1 according to the related art has a structure in which the driving shaft 7 is integrally formed long as it can refer to Fig. 3, when the operator inserts the long driving shaft 7 into a limited It is very inconvenient to carry out in the inner space of the enclosure H, and thus the assembling productivity of the gas insulated switchgear is deteriorated.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide an improved driving shaft structure, And to provide an opening / closing apparatus for an insulating switch.

An object of the present invention is to provide an apparatus for opening and closing a gas insulated switch, comprising: a disconnector fixed contact electrically connected to a power circuit; A ground contactor fixed contact electrically connected to the ground; A first movable contact movable to a position contacting the disconnector fixed contact and a position separated from the disconnector fixed contact; A second movable contact movable to a position contacting the ground contactor fixed contact and a position separated from the ground contactor fixed contact; A driving shaft connected to the driving source to provide a rotational driving force and having a first shaft portion and a second shaft portion which can be separated and engaged with each other and can be rotated clockwise or counterclockwise; A power transmission mechanism that converts the rotational driving force of the driving shaft into a linear driving force and selectively transmits the linear driving force to the first movable contactor or the second movable contactor; A first electric conductor electrically connected to the power circuit, the first movable contactor and the second movable contactor; And a second conductor electrically connected to the power circuit and the disconnector fixed contact, and an apparatus for opening and closing the gas insulated switch according to the present invention.

According to a preferred aspect of the present invention, the first conductor is in a first state in which the power circuit connects the first movable contact to the disconnector fixed contact by the power transmission mechanism, The first movable contact is separated from the disconnecting fixed contact by the power transmission mechanism, and the second movable contact is disconnected from the disconnecting contact by the power transmission mechanism, And the second movable contact is also brought into a third state in which the power circuit is disconnected when the movable contact is disconnected from the earthing switch fixed contact.

According to another preferred embodiment of the present invention, the power transmission mechanism includes a drive shaft coupled to the drive shaft, rotatable in the same direction as the drive shaft rotates, and having a driving pin at one end thereof, lever; A first link having one end connected to the first movable contact and having a power reception groove portion for allowing entry and departure of the drive pin on one side and pivotable by the rotation of the drive pin; A second link having one end connected to the second movable contact and having a power reception groove portion for allowing entry and departure of the drive pin on one side and pivotable by the rotation of the drive pin; A first rotating shaft fixedly installed at a first predetermined position of the first engager and providing a rotation support point of the first link; And a second rotating shaft fixedly installed at a predetermined second position of the first engager and providing a rotation support point of the second link.

According to another preferred embodiment of the present invention, when assembling the first shaft portion and the second shaft portion of the drive shaft, the first shaft portion and the second shaft portion, An enclosure having at one side thereof an opening for allowing any one to be pushed in; And a manipulator installed at a position facing the opening and connected to provide a power source to the drive shaft.

According to another preferred aspect of the present invention, the first shaft portion has a recessed portion allowing insertion of one end of the second shaft portion, and the second shaft portion has an inserted shaft portion inserted into the recessed portion.

According to another preferred embodiment of the present invention, the recessed portion has a key slot portion on an inner circumferential surface thereof, and the insertion shaft portion has a key portion protruding to correspond to the keyed groove portion on the outer circumferential surface Or the key groove portion protrudes from the inner circumferential surface, and the insertion shaft portion has the key groove portion on the outer circumferential surface so as to correspond to the key portion.

According to another preferred aspect of the present invention, the first shaft portion is longer than the second shaft portion, and three link connecting portions, which are exposed and have a polygonal transverse section, are connected to the power transmission mechanism, 1 shaft portion.

According to another preferred embodiment of the present invention, the first shaft portion includes three link connecting portions exposed and having a polygonal transverse section so that the power transmitting mechanism for converting the rotational power into a linear power can be connected thereto; A pair of circular shafts provided between the pair of link connecting portions and having a circular cross section; And an insulating cover portion coated on the circular shaft portion.

According to another preferred embodiment of the present invention, the second shaft portion includes: a power receiving end having a rectangular cross-section for receiving rotational power from the drive source; An insertion shaft portion located at an opposite side end of the power receiving end and inserted into the first shaft portion; A circular shaft portion provided between the power reception end and the insertion shaft portion and having a circular cross section; And an insulating cover portion coated on the circular shaft portion.

According to another preferred aspect of the present invention, the insulating cover portion is configured to have at least one planar cutout portion.

The opening / closing device for a gas insulated switchgear according to the present invention is characterized in that the opening / closing device for the gas insulated switchgear includes a first shaft portion and a second shaft portion, which can be separated and combined with each other, Since the mechanism selectively transmits the power to the first movable contactor or the second movable contactor, it is possible to selectively transmit the power only to the intended movable contactor, thereby achieving a high efficiency of transfer and a small operation output with respect to the above- The first shaft portion can be finally assembled to the second shaft by inserting the second shaft portion in the housing after assembling the second shaft portion outside the power transmission mechanism and the housing and pushing the second shaft portion from the outside of the housing, The effect that the assembling process of the power transmission mechanism can be made simple and quick Can be obtained.

In the opening / closing apparatus for a gas insulated switchgear according to the present invention, the first conductor may be in a first state connecting the power circuit, a second state grounding the power circuit, and a third state disconnecting the power circuit, It is possible to obtain an effect that the power circuit can be displaced to three positions of connection (connection), ground, and disconnection according to the position (state) of the first conductor according to the operation of one opening / closing device according to the present invention.

In the opening and closing apparatus for a gas insulated switchgear according to the present invention, the power transmission mechanism may include a drive lever having a drive pin at one end thereof, and a power reception groove portion for allowing the drive pin to enter and leave, A first link rotatable by the rotation of the driving pin, a second link rotatable by the rotation of the driving pin, and a second link rotatably mounted on the first link, And a second rotation axis portion that provides a rotation support point of the second link. Therefore, when the drive pin is moved in and out, the first link and the second link The driving force is selectively transmitted from only one link to the link, so that the energy efficiency of the power transmission is increased, so that the manipulator having a small output as compared with the conventional technique can be used And the first and second rotary support shafts provide the effect that the rotation of the first link and the second link can be axially supported.

The opening / closing device for a gas insulated switchgear according to the present invention further includes an enclosure having an opening on one side and an actuator, so that when assembling the first and second shaft portions, any one of the first shaft portion and the second shaft portion It is possible to assemble the drive shaft with ease and to provide the effect that the drive shaft can provide the opening and closing force of the opening and closing device by receiving power from the operating device.

In the opening / closing apparatus for a gas insulated switchgear according to the present invention, since the first shaft portion has the recessed portion and the second shaft portion has the insertion shaft portion, by inserting the insertion shaft portion of the second shaft portion into the recessed portion of the first shaft portion, The first shaft portion and the second shaft portion can be easily separated by simply engaging the shaft portion and the second shaft portion and disengaging the insertion shaft portion of the second shaft portion from the recessed portion of the first shaft portion.

In the opening and closing apparatus for a gas insulated switchgear according to the present invention, the recessed portion may include a keyed portion on an inner circumferential surface thereof, and the insertion shaft portion may have a keyed portion protruded to correspond to the keyed portion, Since the key groove portion is provided on the outer circumferential surface so that the groove portion corresponds to the key portion, the first shaft portion and the second shaft portion are integrally combined So that it is possible to obtain an effect of rotating.

In the opening and closing apparatus for a gas insulated switchgear according to the present invention, the first shaft portion is longer than the second shaft portion, and three link connecting portions exposed and having a polygonal transverse section are provided in the first shaft portion, After the power transmission mechanism is connected to the link connecting portion from the outside of the enclosure, an assembly of the power transmission mechanism and the first shaft is installed inside the enclosure, and then, through the opening of the enclosure, It is possible to easily assemble the drive shaft by pushing the shaft and assembling it with the first shaft.

In the apparatus for opening and closing a gas insulated switchgear according to the present invention, the first shaft portion includes three link connecting portions exposed and having a polygonal transverse section, a pair of circular shaft portions provided between the pair of link connecting portions, The corresponding drive levers among the power transmission mechanisms are connected to the three link connection portions and the surface insulation distance with respect to the adjacent pole is measured by the insulating cover portion, ) Can be ensured.

In the opening and closing apparatus for a gas insulated switchgear according to the present invention, the second shaft portion may include a power receiving end having a rectangular cross section, and an insertion shaft disposed at the opposite side end of the power receiving end and inserted into the first shaft portion, And an insulating covering portion which is provided between the power receiving end and the insertion shaft portion and has a circular shaft portion having a circular cross section and an insulating covering portion coated on the circular shaft portion, It is possible to receive power and to be coupled to the first shaft portion through the insertion shaft portion, and an effect of securing a creepage insulation distance from the adjacent phase through the insulating closure portion can be obtained.

In the opening / closing apparatus for a gas insulated switchgear according to the present invention, since the insulating clad part has at least one plane cutout part, the first shaft part and the second shaft part before the assembly are rolled off, .

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing the construction of an opening / closing device in a gas insulated switchgear according to the prior art, and is a sectional view of a switching device in a neutral state (position)
2 is a cross-sectional view showing the configuration of an opening / closing apparatus in a gas insulated switchgear according to the related art, and is a sectional view of an opening / closing apparatus in a connected state (position)
3 is a perspective view showing the structure of a drive shaft among the opening and closing devices of the gas insulated switchgear according to the related art,
4 is a cross-sectional view showing the overall configuration of an opening and closing apparatus in a gas insulated switchgear according to a preferred embodiment of the present invention, which is a cross-sectional view of the opening and closing apparatus in a neutral state (position)
FIG. 5 is a cross-sectional view showing a neutral state (position) of a movable contactor and a driving device of the gas insulated switchgear according to a preferred embodiment of the present invention,
6 is a perspective view showing a partially enlarged enlarged view of the movable contactor and its driving device among the opening and closing devices of the gas insulated switchgear according to the preferred embodiment of the present invention,
FIG. 7 is a cross-sectional view illustrating a connection state (position) of a movable contactor and a driving device of the gas insulated switchgear according to a preferred embodiment of the present invention,
FIG. 8 is a cross-sectional view showing a grounded state (position) of a sectional view of a movable contactor and a driving apparatus of the gas insulated switchgear according to a preferred embodiment of the present invention,
FIG. 9 is an exploded perspective view of a drive shaft separately showing a configuration of a drive shaft in an opening and closing apparatus for a gas insulated switch according to a preferred embodiment of the present invention,
10 is a perspective view showing a key and a key groove of the driving shaft in the opening and closing apparatus for a gas insulated switch according to a preferred embodiment of the present invention,
11 is an exploded perspective view showing an enclosure, a drive shaft, and an actuator separately in an opening and closing apparatus for a gas insulated switch according to a preferred embodiment of the present invention.

The above and other objects, features and advantages of the present invention will be more clearly understood from the following description taken in conjunction with the accompanying drawings.

4 to 11, a configuration of an opening / closing device of a gas insulated switchgear according to a preferred embodiment of the present invention will be described.

4, the opening / closing device SM2 of the gas insulated switchgear according to the preferred embodiment of the present invention includes a disconnector fixed contact 21, a ground contact fixed contact 26, a first movable contact 22, A second movable contactor 28, a drive shaft 27, a power transmission mechanism 24, 25, 29, 25c and 29c, a first electric conductor 23 and a second electric conductor 21a, 21b and 21c .

When the gas insulated switchgear is for three-phase alternating current, the opening / closing device SM2 may be provided with three corresponding to the three phases of AC in the same manner as the above-described conventional technique, and each opening / closing device SM2 includes one .

However, only one enclosure H and the first cover plate P1, the second cover plate P2 and the third cover plate P3 are provided in common for the three opening / closing apparatuses SM2.

Since the plurality of phase-change switching devices SM2 have the same configuration, the detailed configuration of the switching devices SM2 of any one phase will be described below.

The disconnector fixed contact 21 may be electrically connected to the power circuit. Here, the power circuit may be, for example, a power supply side line or a load side line of the ultra high voltage power circuit as an ultra high voltage power circuit having a rated voltage ranging from tens of kilovolts (kV) to several hundreds of kilovolts.

The disconnector fixed contact 21 can be connected and supported in the same manner as the insertion of the bolt as shown in the center second conductor 21a among the second conductors 21a, 21b and 21c described later.

The disconnector fixed contact 21 can constitute a disconnecting device together with the first movable contact 22 to be described later.

The ground contactor fixed contact 26 is a fixed contact electrically connected to the ground, and can constitute a ground contactor together with the second movable contact 28 described later.

 The ground contact 26 may be grounded to earth via a ground connection 26a and a ground connection conductor such as a ground line and / or a grounding bar, not shown.

The ground terminal 26a is fixed to one side of the enclosure H (the upper side of the enclosure in Fig. 4, and the lower side of the enclosure in Fig. 11).

The first movable contact 22 is a contact movable to a position where it contacts the isolator fixed contact 21 and a position that separates from the isolator fixed contact 21.

The first movable contact 22 may be formed of a rod-shaped conductor.

The first movable contact 22 is electrically connected to the power circuit through the first guide hole 23a, the first conductor 23 and the power circuit connecting conductor 23c.

The second movable contact 28 is a contact movable to a position where it contacts the ground contactor fixed contact 26 and a position that separates from the ground contactor fixed contact 26. [

The first movable contact 22 may be composed of a rod-shaped conductor.

The first movable contact 22 is electrically connected to the power circuit through the second guide hole 23b, the first conductor 23 and the power circuit connecting conductor 23c.

The drive shaft 27 is connected to a drive source to provide a rotational driving force and includes a first shaft portion 27a and a second shaft portion 27b which can be separated and engaged with each other, Respectively.

The drive shaft 27 is rotatable clockwise or counterclockwise.

The detailed structure of the drive shaft 27 will be described later with reference to Figs. 9 to 10. Fig.

The power transmission mechanisms 24, 25, 29, 25c, and 29c are means for converting the rotational driving force of the driving shaft into a linear driving force and selectively transmitting the linear driving force to the first movable contactor or the second movable contactor.

The power transmission mechanisms 24, 25, 29, 25c and 29c are connected to the drive lever 24, the first link 25, the second link 29, the first rotation shaft portion 25c, (29c).

4 or 5, the drive lever 24 is a member coupled to the drive shaft 27 and rotatable in the same direction in accordance with the rotation of the drive shaft 27. As shown in Fig.

The driving lever 24 has a driving pin 24d at one end as shown in Fig.

5 or 6, the drive lever 24 includes a first power reception portion 24a, a second power reception portion 24b, a lever portion 24c, and a drive pin 24d .

The first power receiving portion 24a and the second power receiving portion 24b may be schematically constituted by members each having a half-ring shape.

The first power receiving portion 24a and the second power receiving portion 24b are located at the upper and lower positions in the figure and when the first power receiving portion 24a and the second power receiving portion 24b are coupled to each other, the drive shaft 27 is inserted into the inner diameter portion, 27, respectively.

5, the first power receiving portion 24a and the second power receiving portion 24b may be coupled to each other by a bolt inserted into the first power receiving portion 24a and the second power receiving portion 24b, (B) or a screw.

 The lever portion 24c has a plate shape portion extending from the base portion and having a lower base portion connected to the second power receiving portion 24b and a free end portion formed to have a curved surface at the end of the plate- End.

As best shown in Fig. 6, the free end of the lever portion 24c is provided with a driving pin 24d.

5, the first link 25 has one end connected to the first movable contactor 22, and includes a first power reception groove portion (not shown) for allowing the drive pin 24d to enter and leave 25b are provided on one side.

The connection between the first link 25 and the first movable contact 22 is made by connecting pins 22a provided at one end of the first movable contact 22 and a second link 25 by the connection of the first elongated hole 25a provided on the one end side of the base plate.

The first power reception groove portion 25b is provided on the right side of the other end of the first link 25 in Fig.

The first power reception groove portion 25b is formed between the long extension portion 25b1 provided on the lower side in Fig. 6 and the short extension portion 25b2 provided on the upper side.

The long extended portion 25b1 is a portion receiving a turning power by contact and pressing of the driving pin 24d.

The purpose of providing the extended portion 25b2 shorter than the extended portion 25b1 is to prevent the rotation of the driving pin 24d when the driving pin 24d enters and leaves the first power receiving groove portion 25b In order to avoid such problems.

The first link 25 is rotatable by the urging of the rotating driving pin 24d.

5, the second link 29 has one end connected to the second movable contact 28 and includes a second power reception groove portion (not shown) for allowing the drive pin 24d to enter and leave 29b on one side.

The connection between the second link 29 and the second movable contact 28 is established by the connection pin 28a provided at one end of the second movable contact 28 and the second link 28a accommodated with the connection pin 28a, 29, which is provided on one end side of the second end portion 29a.

The second power reception groove portion 29b is provided on the left side portion in Fig. 5 of the other end of the second link 29. [

The second power reception groove portion 29b is formed between the long extension portion 29b1 provided on the lower side in FIG. 6 and the short extension portion 29b2 provided on the upper side.

The long extended portion 29b1 is a portion receiving a turning power by contact and pressing of the driving pin 24d.

It is preferable that the stepped portion 29b2 is formed to be shorter than the elongated portion 29b1 so as not to interfere with the rotation of the drive pin 24d when the drive pin 24d enters and leaves the second power receiving groove portion 29b desirable.

5 of the other end of the second link 29 is located on the right side of the second link 29 so as to face the second rotation support shaft 30b and contacts the second rotation support shaft 30b, 30b.

The second link 29 is rotatable by the urging of the rotating drive pin 24d.

5, the first rotary shaft portion 25c is fixed to a predetermined first position of the first electric conductor 23, and provides a rotation support point of the first link 25. As shown in Fig.

The first rotating shaft 25c may be formed as a column which is provided separately from the first bullet 23 and fixed at a first position or may be formed as a protrusion integrally provided with the first bullet 23 at a first position have.

The second rotary shaft portion 29c is fixed to a predetermined second position of the first engager 23 to provide a rotation support point of the second link 29. [

The second rotary shaft portion 29c may be formed of a column portion which is provided separately from the first bullet portion 23 and is fixed at a second position or may be formed as a protruding portion integrally provided with the first bullet portion 23 at a second position have.

5, 7, and 8, reference numerals 30a and 30b denote a first stopper portion and a second stopper portion that stop the rotation of the first link 25 and the second link 29, respectively.

The first stopper portion 30a and the second stopper portion 30b are provided separately from the first bullet 23 so that the first bullet portion or the first bullet 23 fixed at a predetermined position among the first bullets 23, And may be formed as a protrusion integrally provided at a determined position.

The first conductor (23) is a member formed of an electrically conductive material and electrically connected to the power circuit and the first movable contact (22) and the second movable contact (28).

Further, the first conductor 23 is a member for guiding the linear movement of the first movable contact 22 and the second movable contact 28.

For this purpose, linear movements of the first movable contactor 22 and the second movable contactor 28 are provided at respective positions facing the disconnector fixed contacts 21 and the ground contactor fixed contacts 26 in the first conductor 23 A pair of guide holes 23a and 23b are provided.

The first guide hole 23a and the second guide hole 23b of the pair of guide holes 23a and 23b are formed in the first bullet 23 so as to face the stationary contactor 21 and the ground contactor fixed contact 26, The viewing is formed linearly to extend a predetermined length from the pair of ends.

The diameters of the first guide hole 23a and the second guide hole 23b may be set to be as large as the predetermined small clearances respectively larger than the diameters of the first movable contactor 22 and the second movable contactor 28 have.

The first guide hole 23a and the second guide hole 23b are provided with at least one first guide hole 23a and a second guide hole 23b for electrical connection between the first bullet 23 and the first movable contact 22 and the second movable contact 28, A ring shaped conductive spring may be provided to contact the first movable contact 22 and the second movable contact 28. [

The first conductor 23 is connected to the first movable contact 22 by a power transmission mechanism 24, 25, 29, 25c, and 29c in a first state connecting the power circuit when the first movable contact 22 contacts the disconnector contact 21, .

The first conductor 23 is electrically connected to the second contactor 28 by means of the power transmission mechanism 24, 25, 29, 25c, and 29c to ground the power circuit when the second movable contact 28 contacts the ground contactor 26 State.

The first movable contactor 22 is separated from the disconnector fixed contact 21 by the power transmission mechanism 24, 25, 29, 25c, 29c and the second movable contactor 28 is also grounded And becomes a third state in which the power circuit is disconnected when disconnected from the switch contact 26. [

In FIG. 4, reference numeral 23c designates a power circuit connecting conductor formed integrally or separately with the first conductor 23 and capable of being electrically connected to the power circuit.

11, the first conductor 23 has an axial through-hole 23d that allows the drive shaft to pass through the central portion,

As can be seen from Fig. 4, the second conductors 21a, 21b, and 21c are formed of different conductors that are electrically connected to the power circuit and the disconnector fixed contact 21, respectively.

4, the intermediate conductor 21a of the second conductors 21a, 21b and 21c is connected to the disconnector fixed contact 21 by a connecting means such as a bolt and is connected to the disconnector fixed contact 21 .

The upper conductor 21b of the second conductors 21a, 21b, and 21c may be configured such that two conductors are connected to each other by a connecting means such as a bolt according to the embodiment as shown in the figure, The conductor connected to the conductor 21a can be connected by elastic contact with at least one ring-shaped conductive spring provided at the one end of the intermediate conductor 21a inserted in the connecting hole portion.

4, reference numerals P1, P2, and P3 denote a first cover plate that can seal the opening portions formed at the upper, lower, and right sides of the enclosure H, respectively, Indicate plate.

The opening and closing device SM2 of the gas insulated switchgear according to the preferred embodiment of the present invention further includes an enclosure H for accommodating the components of the opening and closing device SM2 as can be seen in Figures 4 and 11 .

11, when the first shaft portion 27a and the second shaft portion 27b of the drive shaft 27 are assembled, Has an opening (H1) on one side of the first shaft portion (27a) and the second shaft portion (27b), which allows the second shaft portion (27b) do.

As can be seen from Fig. 11, the opening and closing apparatus SM2 according to the present invention further includes an actuator (A).

The manipulator A is installed at a position facing the opening H1 and is connected to provide a power source to the drive shaft 27. [

The manipulator A may include a motor and a transmission, which are not shown, a transmission output shaft connected to the drive shaft 27, and a control unit.

9 and 10, the detailed structure of the drive shaft 27 of the opening and closing apparatus SM2 according to the present invention will be described.

As can be seen from Fig. 10, the first shaft portion 27a has a recessed portion 27a1-1 that allows the insertion of one end of the second shaft portion 27b.

The second shaft portion 27b has the insertion shaft portion 27b1 as one end portion to be inserted into the recessed portion 27a1-1.

The recessed portion 27a1-1 has a key slot portion on the inner circumferential surface and the insertion shaft portion 27b1 has a key portion 27c protruding to correspond to the keyed portion Or a key portion 27c having the recessed portion 27a1-1 protruding from the inner circumferential surface thereof and the insertion shaft portion 27b1 corresponding to the key portion 27c The key groove portion 27b1-1 may be provided on the outer peripheral surface.

9 and 10, the first shaft portion 27a is longer than the second shaft portion 27b.

The first shaft portion 27a is first installed in the enclosure H and the second shaft portion 27b is then pushed through the opening H1 formed on one side of the enclosure H according to the present invention, The connection end of the first shaft portion 27a connected to the second shaft portion 27b (that is, the recessed portion 27a1-1) is connected to the opening portion H1, As shown in Fig. Therefore, the first shaft portion 27a, which is first installed in the enclosure H, is longer than the second shaft portion 27b.

9 and 10, three lever connection portions 27a1, 27a2 (each of which is exposed and has a polygonal cross-section) so that the power transmission mechanisms 24, 25, 29, 25c, And 27a3 are provided on the first shaft portion 27a.

Here, the members directly connected to the lever connection portions 27a1, 27a2, 27a3 among the power transmission mechanisms 24, 25, 29, 25c, 29c may be connected to the drive lever 24 )to be.

9 and 10, the first shaft portion 27a includes three lever connecting portions 27a1, 27a2, 27a3, a pair of circular shaft portions 27a4, and an insulating covering portion 27a5 ).

The three link connecting portions 27a1, 27a2 and 27a3 are exposed so that the power transmission mechanisms 24, 25, 29, 25c and 29c for converting the rotational power into linear power can be connected, Which is square in the illustrated embodiment).

The pair of circular shaft portions 27a4 are each constituted by a pair of lever connecting portions, that is, between the lever connecting portions 27a1 and 27a2 and between the lever connecting portions 27a2 and 27a3, and the shaft portion having a circular transverse section .

Two insulating clad portions 27a5 are coated on the pair of circular shaft portions 27a4.

The insulating cover portion 27a5 is provided for the purpose of securing a surface insulating distance between the corresponding drive levers 24 as an insulating material covering portion provided for electrical insulation between the adjacent drive levers 24. [

The insulating cover portion 27a5 has at least one planarly cutout portion 27a5-1. It is possible to prevent the occurrence of the phenomenon that the first shaft portion 27a rolls off before assembling and deviates from the assembly stand-by position by the plane cutout portion 27a5-1.

9 and 10, the second shaft portion 27b includes a power receiving end 27b4, an insertion shaft portion 27b1, a circular shaft portion 27b2, and an insulating cover portion 27b3. .

The power receiving end 27b4 is a shaft portion for receiving the rotational power from the drive unit A as a drive source and is a shaft portion having a rectangular cross section.

The insertion shaft portion 27b1 is a shaft portion which is located at the opposite end of the second shaft portion 27b opposite to the power reception end 27b4 and is inserted into the first shaft portion 27a.

The circular shaft portion 27b2 is provided between the power reception end 27b4 and the insertion shaft portion 27b1 and is a shaft portion having a circular transverse section.

The insulating cover portion 27b3 is coated on the circular shaft portion 27b2.

The insulating sheath portion 27b3 has at least one planarly cutout portion 27b2-1. The occurrence of the phenomenon that the second shaft portion 27b rolls before the assembly is released from the assembly waiting position can be prevented by the plane cutout portion 27b2-1.

A method of assembling the drive shaft and the power transmitting mechanism in the opening and closing apparatus for gas insulated switchgear according to the present invention constructed as described above will be described with reference mainly to Fig.

First, an assembly of three three-phase first conductors 23 connected to the third cover plate P3 is prepared outside the enclosure H. At this time, among the three-phase first conductors 23, the components except for the drive shaft 27 and the drive lever 24 (for example, movable contacts, links, etc.) are assembled in FIG.

Next, outside the enclosure H, the operator grasps and pushes the first shaft portion 27a through the shaft through-hole 23d provided at the center of each first engager 23.

10, the lever connecting portion 27a3 is located through the first rightmost first conductor 23 in Fig. 11, and the lever connecting portion 27a2 in Fig. 10, the lever connecting portion 27a1 is located between the center first conductor 23 and the rightmost first conductor 23, and the lever connecting portion 27a1 is located between the center first conductor 23 and the leftmost first conductor 23, (23).

Next, the first power reception portion 24a and the second power reception portion 24b of the drive lever 24 are connected to the respective lever connection portions 27a1, 27a2, 27a3 of the first shaft portion 27a with bolts B To be clamped.

Next, the assembled third cover plate P3 and three three-phase first conductors 23 and the first shaft portion 27a are installed in the enclosure H. Then,

An unillustrated support member such as a bearing is fixed to one inner side wall of the enclosure H so that the support end 27a6 of FIG. 9 or 10 can be supported by the support member.

11, the operator grasps the second shaft portion 27b, and the insertion shaft portion 27b1 is inserted into the first shaft portion 27a through the opening H1 formed on one side of the housing H ) To face each other.

At this time, the key groove 27b1-1 provided in the insertion shaft portion 27b1 of the second shaft portion 27b and the key portion 27c provided in the recessed portion 27a1-1 of the first shaft portion 27a, So as to push them together.

Thus, the assembly of the drive shaft and the power transmission mechanism can be completed in the opening / closing apparatus of the gas insulated switchgear according to the present invention.

When the output shaft (not shown) of the manipulating device A of Fig. 11 is connected to the power receiving end 27b4 of the first shaft portion 27a shown in Figs. 9 and 10, (27) can be completed.

The operation of the opening / closing device SM2 of the gas insulated switchgear according to the preferred embodiment of the present invention will be described with reference to Figs. 4, 5, 7 and 8. Fig.

First, the operation of the apparatus for opening and closing the gas insulated switch according to the present invention from the disconnected state (position) shown in Figs. 4 and 5 to the connected state (position) shown in Fig. 7 will be described.

In the state shown in FIG. 4 or 5, when the rotational power from the actuator A is transmitted through the drive shaft 27 and the drive lever 24 rotates counterclockwise by a predetermined angle, The drive pin 24d connected to the drive lever 24 rotates in the same counterclockwise direction so that the lower long extension 25b1 of the first link 25 forming the first power reception groove 25b Pressure.

Since the driving pin 24d is disengaged from the second power receiving groove 29b of the second link 29 according to a preferred aspect of the present invention, no rotational power is transmitted to the second link 29, 2 link 29 and the second movable contact 28 stop. As described above, according to the present invention, since the rotational power from the manipulator A is transmitted selectively to only one of the first link 25 and the second link 29, the transfer efficiency of the drive energy is high.

The first link 25 rotates clockwise about the first rotation axis 25c and the first movable contact 22 connected to the first link 25 through the connection pin 22a, And the state shown in Fig. 7 is obtained.

The advancement of the first movable contact 22 causes the first movable contact 22 to come into contact with the disconnector fixed contact 21 in Fig. 4 and thus the first movable contact 22 23) and the power circuit electrically connected to the disconnecting switch fixed contact 21 are connected (connected) to each other. Thus, the power supply side and the load side of the power circuit are in a state of being energized.

On the other hand, in the state shown in Fig. 7, when the rotational power from the manipulator A is transmitted through the drive shaft 27 and the drive lever 24 is rotated by a predetermined angle in the clockwise direction, The connected drive pin 24d rotates in the same clockwise direction so as to press the upper end extended portion 25b1 of the first link 25 to form the first power reception groove portion 25b of the first link 25, ) In the counterclockwise direction.

The first movable contact 22 connected to the first link 25 via the connection pin 22a retreats to the neutral position shown in Fig. 4 or Fig. The power circuit to which the first movable contactor 22 is disconnected from the disconnector fixed contact 21 and is connected to the first movable contactor 22 via the first electric conductor 23 and the second circuit breaker contactor 21, The power circuit connected through the conductors 21a, 21b, and 21c is disconnected.

At this time, the drive pin 24d approaches the second power reception groove portion 29b of the second link 29 according to a preferred aspect of the present invention, but the lower end extension portion 29b, which forms the second power reception groove portion 29b, The second link 29 and the second movable contact 28 stop because no rotational power is transmitted to the second link 29 because the state in which the second link 29 and the portion 29b1 are not pressed. As described above, according to the present invention, since the rotational power from the manipulator A is transmitted selectively to only one of the first link 25 and the second link 29, driving energy can be efficiently transmitted.

On the other hand, in the state shown in Fig. 4 or Fig. 5, rotational power from the manipulator A is transmitted through the drive shaft 27 and the drive lever 24 rotates clockwise by a predetermined angle. The drive pin 24d connected to the drive lever 24 rotates in the same clockwise direction and the lower long extension 29b1 of the second link 29 forms the second power reception groove 29b, So as to rotate the second link 29 counterclockwise.

The second movable contact 28 connected to the second link 29 via the connecting pin 28a moves upward as shown in FIG. The power circuit to which the second movable contactor 28 is connected via the first conductive contact 3 to the second movable contactor 28 by contact with the ground contactor fixed contact 26 and the ground contactor fixed contact 26 The connected ground is connected to the ground state.

At this time, the driving pin 24d completely disengages from the first power receiving groove 25b of the first link 25 according to a preferred aspect of the present invention, so that no rotational power is transmitted to the first link 25, The first link 25 and the first movable contact 22 stop. As described above, according to the present invention, since the rotational power from the manipulator A is transmitted selectively to only one of the first link 25 and the second link 29, the transfer efficiency of the drive energy is high.

8, when the rotational power from the manipulator A is transmitted through the drive shaft 27 and the drive lever 24 rotates counterclockwise by a predetermined angle, the drive lever 24 rotates clockwise, The driving pin 24d connected to the second link 29 rotates in the same counterclockwise direction to press the upper step 29b1 of the upper part of the drawing forming the second power receiving groove 29b of the second link 29, (29) in the clockwise direction.

The second movable contact 28 connected to the second link 29 via the connecting pin 28a is lowered to the neutral position shown in Fig. 4 or Fig. The power circuit to be connected to the second movable contactor 28 via the first conductor 23 by the second movable contactor 28 being disconnected from the ground contactor fixed contact 26 and the ground contactor fixed contact 26 The ground circuit connected through the ground terminal 26a is cut off and becomes a disconnection position.

As described above, the opening and closing apparatus for a gas insulated switchgear according to the present invention includes a first shaft portion and a second shaft portion, each of which can be separated and combined with each other, and converts the rotational driving force of the driving shaft into a linear driving force The power transmitting mechanism selectively transmits the power to the first movable contactor or the second movable contactor, so that it is possible to selectively transmit the power only to the intended movable contactor, The second shaft portion can be assembled outside the enclosure and then installed in the enclosure and the second shaft portion can be pushed out of the enclosure to finally combine the first shaft portion with the second shaft The assembly process of drive shaft and power transmission mechanism is simple and quick. The effect can be obtained.

1: disconnector fixed contacts 1a, 1b, 1c: a second conductor
2: first movable contactor 3: first conductor;
3a: a first guide opening portion 3b: second guide hole portion 3c: power circuit connecting portion
4: drive lever 5: first link
6: Ground contactor fixed contacts
7: drive shaft 7a: shaft portion
7b: Insulation covering part
8: second movable contactor 9: second link
H: enclosure P1: first cover plate
P2: second cover plate P3: third cover plate
21: disconnector fixed contacts 21a, 21b, 21c: second challenger
22: first movable contactor 22a: connecting pin
23: first engager 23a: first guide hole
23b: second guide portion 23c: power circuit connecting conductor
23d: shaft through hole 24: drive lever
24a: first power receiving portion 24b: second power receiving portion
B: bolt 24c: lever part
24d: drive pin 25: first link
25a: first long hole portion 25b: first power receiving groove portion
25b1: a long extension part 25b2: a short extension part
25c: first rotating shaft part 26: grounding switch fixed contact
26a: ground terminal 27: drive shaft
27a: First shaft portion 27a1, 27a2, 27a3: Lever connecting portion
27a1-1: recessed groove portion 27a1-2: key mounting groove portion
27a4: circular shaft portion 27a5: insulating cover portion
27a5-1: Plane cut-
27a6: Support end portion 27b: Second shaft portion
27b1: insertion shaft portion 27b1-1: key groove portion
27b2:
27b3: Insulation covering portion 27b3-1: Plane cut-
27b4: Power receiving end 27c:
28: second movable contact 28a: connecting pin
29: second link 29a: second long hole
29b: second power receiving groove portion 29b1:
29b2: an end extension portion 29c: a second rotation shaft portion
30a: first stopper portion 30b: second stopper portion
A: Actuator SM1: opening / closing device (prior art)
SM2: Switching device (present invention)

Claims (10)

An apparatus for opening and closing a gas insulated switch,
A disconnector fixed contact electrically connected to the power circuit;
A ground contactor fixed contact electrically connected to the ground;
A first movable contact movable to a position contacting the disconnector fixed contact and a position separated from the disconnector fixed contact;
A second movable contact movable to a position contacting the ground contactor fixed contact and a position separated from the ground contactor fixed contact;
A driving shaft connected to the driving source to provide a rotational driving force and having a first shaft portion and a second shaft portion which can be separated and engaged with each other and can be rotated clockwise or counterclockwise;
A power transmission mechanism that converts the rotational driving force of the driving shaft into a linear driving force and selectively transmits the linear driving force to the first movable contactor or the second movable contactor;
A first conductor electrically connected to the power circuit, the first movable contact and the second movable contact; And
And a second conductor electrically connected to the power circuit and the disconnector fixed contact,
The first shaft portion has a recessed portion for allowing insertion of one end of the second shaft portion,
The second shaft portion has an insertion shaft portion inserted into the recessed portion,
The key groove portion may have a key slot portion on an inner circumferential surface thereof and the insertion shaft portion may have a key portion projecting to correspond to the key groove portion on the outer circumferential surface,
Wherein the groove portion has a key portion protruding from the inner circumferential surface, and the insertion shaft portion has a key groove portion on the outer circumferential surface so as to correspond to the key portion. The method according to claim 1,
Wherein the first conductor comprises a first conductor,
The power transmission mechanism is in a first state connecting the power circuit when the first movable contact contacts the disconnector fixed contact,
The power transmission mechanism is brought into a second state in which the power circuit is grounded when the second movable contact contacts the ground contactor fixed contact,
And a third state in which the power circuit disconnects the power circuit when the first movable contact is separated from the disconnector fixed contact and the second movable contact is also disconnected from the ground contactor fixed contact The opening / closing device of the gas insulated switch. The method according to claim 1,
The power transmission mechanism includes:
A drive lever coupled to the drive shaft and rotatable in the same direction according to rotation of the drive shaft, the drive lever having a driving pin at one end;
A first link having one end connected to the first movable contact and having a power reception groove portion for allowing entry and departure of the drive pin on one side and pivotable by the rotation of the drive pin;
A second link having one end connected to the second movable contact and having a power reception groove portion for allowing entry and departure of the drive pin on one side and pivotable by the rotation of the drive pin;
A first rotating shaft fixedly installed at a first predetermined position of the first engager and providing a rotation support point of the first link; And
A second rotation axis portion fixed to a predetermined second position of the first engager and providing a rotation support point of the second link; And an opening / closing device for opening / closing the gas insulated switch. The method according to claim 1,
An opening portion for accommodating the components of the opening and closing device and allowing one of the first shaft portion and the second shaft portion to be pushed when the first shaft portion and the second shaft portion of the drive shaft are assembled, An enclosure provided on the side surface; And
And an actuator installed at a position facing the opening and connected to provide a power source to the drive shaft. delete delete The method according to claim 1,
Wherein the first shaft portion is longer than the second shaft portion,
Wherein three lever connecting portions, exposed and having a polygonal transverse section, are provided on the first shaft portion so that the power transmission mechanism can be connected thereto. The method according to claim 1,
The first shaft portion
Three lever connecting portions exposed and having a polygonal transverse cross section so that the power transmission mechanism for converting a rotational power into a linear power can be connected;
A pair of circular shafts provided between the pair of lever connecting portions and having a circular cross section; And
And an insulating cover portion covering the circular shaft portion of the gas insulated switchgear. 8. The method of claim 7,
And the second shaft portion
A power receiving end having a rectangular cross-section for receiving rotational power from the drive source;
An insertion shaft portion located at an opposite side end of the power receiving end and inserted into the first shaft portion;
A circular shaft portion provided between the power reception end and the insertion shaft portion and having a circular cross section; And
And an insulating cover portion covering the circular shaft portion of the gas insulated switchgear. 10. The method according to claim 8 or 9,
Wherein the insulating cover portion has at least one planar cut-out portion.

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