阅读说明：本技术 气体绝缘开关装置的快速接地开关 (Quick grounding switch of gas insulated switchgear ) 是由 金炯镇 林祐陞 于 2019-10-14 设计创作，主要内容包括：本发明涉及气体绝缘开关装置的快速接地开关,更详细地说,涉及一种通过设置送风机构来提高电弧切断性能的气体绝缘开关装置的快速接地开关。本发明一实施例的气体绝缘开关装置的快速接地开关包括：外盒；缸筒构件,设置于所述外盒的内部,在所述缸筒构件的下部沿圆周面形成有通气孔；以及活塞构件,插入并设置于所述缸筒构件的内部,通过从驱动部接收力来进行前进后退运动,以在开放时向触头部喷射所述缸筒构件的内部的空气。(The present invention relates to a quick ground switch for a gas insulated switchgear, and more particularly, to a quick ground switch for a gas insulated switchgear, which is provided with a blowing mechanism to improve arc interruption performance. The fast grounding switch of the gas insulated switchgear according to an embodiment of the present invention includes: an outer box; a cylinder member provided inside the outer box, the cylinder member having a vent hole formed along a circumferential surface at a lower portion thereof; and a piston member inserted and disposed inside the cylinder member, and moving forward and backward by receiving a force from the driving portion to eject air inside the cylinder member toward the contact portion when the contact portion is opened.)

1. A fast grounding switch for a gas insulated switchgear, comprising:

an outer box;

a cylinder member provided inside the outer box, the cylinder member having a vent hole formed along a circumferential surface at a lower portion thereof; and

and a piston member inserted and disposed inside the cylinder member, and moving forward and backward by receiving a force from the driving portion to eject air inside the cylinder member toward the contact portion when the contact portion is opened.

2. Fast grounding switch of a gas insulated switchgear according to claim 1,

a cylinder bore is formed in a bottom surface of the cylinder member, and the cylinder bore enables the piston member to move in a longitudinal direction.

3. Fast grounding switch of a gas insulated switchgear according to claim 1,

a transverse hole is formed in the intermediate portion of the piston member.

4. Fast grounding switch of a gas insulated switchgear according to claim 3,

a longitudinal hole is formed in the piston member from the transverse hole to a lower end portion.

5. Fast grounding switch of a gas insulated switchgear according to claim 4,

a fixed plate is provided at an intermediate portion of the piston member.

6. Fast grounding switch of a gas insulated switchgear according to claim 5,

the fixing plate is disposed at a lower portion of the transverse hole.

7. Fast grounding switch of a gas insulated switchgear according to claim 5,

the fixing plate is formed with a plurality of plate through holes.

8. The fast grounding switch of gas insulated switchgear according to claim 7,

a floating plate is disposed above the fixed plate and is slidable along the piston member.

9. The fast grounding switch of gas insulated switchgear according to claim 8,

the outer diameter of the floating plate is smaller than that of the fixed plate.

10. The fast grounding switch of gas insulated switchgear according to claim 8,

the floating plate has an outer diameter sized to completely cover the plate through-hole when the floating plate contacts the fixed plate.

11. The fast grounding switch of gas insulated switchgear according to claim 9,

a guide portion having a predetermined height is formed in a central hole of the floating plate.

12. Fast grounding switch of a gas insulated switchgear according to claim 1,

the length direction of the cylinder member and the piston member is a direction other than the horizontal direction.

Technical Field

The present invention relates to a quick ground switch for a gas insulated switchgear, and more particularly, to a quick ground switch for a gas insulated switchgear, which is provided with a blowing mechanism to improve arc interruption performance.

Background

Generally, a Gas Insulated switchgear (Gas Insulated switchgear) is an electrical apparatus that is provided between circuits between a power supply side and a load side of a power system and that protects the power system and the load apparatus by safely breaking a current when the circuit is artificially turned on and off in a normal current state or when an abnormal current such as a ground or a short circuit occurs on the circuit.

Generally, such a Gas Insulated Switchgear (GIS) is configured by a Bushing (Bushing Unit) that receives power from a high-voltage power supply, a Gas Circuit Breaker (CB), a Disconnector (Disconnector Switch) grounding Switch (Earthing Switch), a movable part, a control part, and the like.

Here, an earth Switch (earth Switch) is a device that is provided in a part of a circuit and functions to manually ground a main circuit at the time of maintenance inspection and to remove a current remaining in a conductor at the time of repair or inspection of the device.

Fig. 1 shows an internal structure of a gas insulated switchgear according to the prior art.

A case is shown in which a breaker/earthing switch (DS/ES)2 and a fast earthing switch (HSES)5, 9, 10 are provided inside an outer case 1. The outer box 1 is provided with a driving part or an operating part 3.

The quick earthing switch (high-speed earthing switch) is roughly divided into a fixed part and a movable part.

The conductor 4 provided inside the outer case 1 is provided with a fixing portion 5. The fixed portion 5 includes a fixed contact 5a and a fixed contact block 5b (see fig. 2).

The movable portion includes a movable shaft 6 connected to the drive portion 3 and rotating, a connector link 7 connected to a crank of the movable shaft 6, a movable contact base 8a and a movable contact 8b fixedly provided inside the outer case 1, a movable element 8c connected to the connector link 7 and connecting or disconnecting the movable contact 8b and the fixed contact 5a by forward movement or backward movement, and the like. In addition, a bus bar 9 for connecting the movable portion and the ground terminal 10 is provided. The bus bar 9 may connect the movable contact block 8a and the ground terminal 10.

As described above, the quick grounding switch is composed of the fixed portion and the movable portion that is in contact with or separated from the fixed portion, and is mainly provided at the power supply lead-in end for releasing the current on the line. The fast grounding switch needs to have electrostatic induction current switching performance, electromagnetic induction switching performance, closing capability (E1 level is 2 times), short-time energization performance, and the like.

The performance of the prior art fast earthing switch depends on the on-off speed, and depending on the kind of the insulating gas, a situation of failure of the cut-off occurs even though the speed is fast. For example, the probability of a cut failure in air (air) is greater than that in SF6 gas.

In fig. 2 and 3, the action of the fast grounding switch of the gas insulated switchgear of the prior art is shown. Fig. 2 shows an open state, and fig. 3 shows a grounded state.

In the conventional quick ground switch of the gas insulated switchgear, the movable shaft 6 is rotated by power transmitted from the driving part 3, and the movable element 8c connected to the movable shaft 6 is moved forward and backward to connect (close) (connection of the movable contact and the fixed contact) or separate (open) (separation of the movable contact and the fixed contact) a ground circuit.

In the closed state, the current flows to the external ground via the fixed contact block 5b, the fixed contact 5a, the movable element 8c, the movable contact 8b, the movable contact block 8a, the bus bar 9, and the ground terminal 10.

However, in the fast grounding switch of the gas insulated switchgear according to the related art, depending on the type of the insulating gas, there is a case where the arc duration (arcing time) at the time of the interruption becomes long, and the interruption fails.

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a quick grounding switch for a gas insulated switchgear, which improves arc interruption performance by providing a blowing mechanism.

Means for solving the problems

The fast grounding switch of the gas insulated switchgear according to an embodiment of the present invention includes: an outer box; a cylinder member provided inside the outer box, the cylinder member having a vent hole formed along a circumferential surface at a lower portion thereof; and a piston member inserted and disposed inside the cylinder member, and moving forward and backward by receiving a force from the driving portion to eject air inside the cylinder member toward the contact portion when the contact portion is opened.

Further, a cylinder hole may be formed in a bottom surface of the cylinder member, and the cylinder hole may move the piston member in the longitudinal direction.

Further, a plurality of vent holes may be formed along a circumferential surface in a lower portion of the cylinder member.

In addition, a lateral hole may be formed at the middle portion of the piston member.

In addition, a longitudinal hole may be formed in the piston member from the lateral hole to a lower end portion.

In addition, a fixing plate may be provided at an intermediate portion of the piston member.

In addition, the fixing plate may be disposed at a lower portion of the lateral hole.

In addition, the fixing plate may have a plurality of plate through holes formed therein.

Further, a floating plate may be disposed on the upper portion of the fixed plate, and the floating plate may be slidable along the piston member.

In addition, the outer diameter of the traveling plate may be smaller than that of the stationary plate.

The floating plate may have an outer diameter that completely covers the plate through-hole when the floating plate contacts the fixed plate.

Further, a guide portion having a predetermined height may be formed in the central hole of the floating plate.

Further, the longitudinal direction of the cylinder member and the piston member may be a direction other than the horizontal direction.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the rapid grounding switch of the gas insulated switchgear of an embodiment of the present invention, the air blowing mechanism blowing air to the fixing portion when the switch is opened is provided, thereby having an effect of rapidly extinguishing an arc. Accordingly, the arc interruption performance is ensured regardless of the type of the insulating gas.

Here, the piston member applied to the blower mechanism is formed integrally with the mover, thereby improving the arc interruption performance without particularly increasing the number of parts or the space occupied.

Further, the air blowing mechanism can secure the flow of air blown out to the stationary portion and also prevent the decrease in the moving speed of the piston member functioning as the mover, by the stationary plate, the floating plate disposed so as to be spaced apart from the stationary plate, and the air flow holes formed in the stationary plate and the cylinder member.

Drawings

Fig. 1 is an internal structural view of a gas insulated switchgear of the related art.

Fig. 2 and 3 show the active state of the fast earthing switch of the gas insulated switchgear of the prior art. Fig. 2 shows the open state and fig. 3 shows the closed (grounded) state.

Fig. 4 is an internal structural view of a gas insulated switchgear according to an embodiment of the present invention.

Fig. 5 is a sectional view of the blowing mechanism of the quick ground switch shown in fig. 4.

Fig. 6 to 9 are operation diagrams of a fast grounding switch of a gas insulated switchgear according to an embodiment of the present invention. Fig. 6 shows an open state, fig. 7 shows a closed operation state, fig. 8 shows a closed state, and fig. 9 shows an open operation state.

Fig. 10 and 11 are operation diagrams of a fast grounding switch of a gas insulated switchgear according to another embodiment of the present invention. Fig. 10 and 11 show a closed state and an open state, respectively.

Fig. 12 and 13 are operation diagrams of a fast grounding switch of a gas insulated switchgear according to another embodiment of the present invention. Fig. 12 and 13 show a closed state and an open state, respectively.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are provided in sufficient detail to enable those skilled in the art to easily practice the present invention, and do not represent limitations on the technical spirit and scope of the present invention.

Hereinafter, a quick grounding switch of a gas insulated switchgear according to various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(first embodiment)

The fast grounding switch of the gas insulated switchgear according to an embodiment of the present invention includes: an outer case 10; a movable shaft 17 provided at a part of the outer case 10; a cylinder member 30 provided spaced apart from the movable shaft 17; and a piston member 20 inserted and disposed inside the cylinder member 30, connected to the movable shaft 17, and moving forward and backward to inject air inside the cylinder member 30 toward the contact portion.

The outer box (tank) 10 is formed in a box shape and can accommodate a breaker (Disconnect Switch), a ground Switch (earth Switch), or the like. At least one of the upper, lower, left, right, front and rear portions of the outer box 10 may be opened. The casing 10 may be a part of the entire casing constituting the gas insulated switchgear. The casing 10 may be any one of a plurality of regions constituting the entire casing of the gas insulated switchgear. The casing 10 may be manufactured in a closed type to maintain insulation from the outside except for the conductor connection portion (socket).

Spacers 11, 12, and 13 are coupled to the open portions of the outer box 10, respectively. The spacers 11, 12, and 13 serve to partition the boundary of the outer case 10 and support the conductors inserted (penetrating) into the spacers.

A plurality of conductors 14, 15 are provided inside the outer case 10. The conductors 14, 15 form part of or are connected to part of an electrical circuit. The conductors 14, 15 are combined with the separators 11, 12, 13 and supported. The conductors 14, 15 may include a first conductor 14 connected to the first spacer 11 and a second conductor 15 connected to the second spacer 12. Each conductor may be provided in plural. For example, in the case of a three-phase circuit, three pairs of conductors 14, 15 may be provided, respectively.

A breaker/ground switch (DS/ES)16 is provided between the first conductor 14 and the second conductor 15.

A quick ground switch is provided inside the outer box 10. The quick grounding switch includes a fixed portion 40 and a movable portion 50.

The fixed portion 40 of the quick grounding switch is disposed on the first conductor 14. The fixing portion 40 of the quick grounding switch includes a fixed contact block 41, a fixed contact 42, and a fixing portion cover 43 (see fig. 6). Here, the fixed contact 42 may be formed of a plurality of chips arranged in a circular shape (radial shape).

The movable portion 50 is provided spaced apart from the first conductor 14. The movable portion 50 includes a movable shaft 17, a piston member 20 functioning as a mover, a movable portion holder 51, and a movable contact 52.

The driving unit (not shown) is provided outside the outer box 10. The driving unit provides a driving force for operating the ground switch.

The movable shaft 17 is provided to penetrate the outer case 10. The movable shaft 17 is connected to the driving unit. The movable shaft 17 is rotated by power transmitted from the driving unit. Here, the movable shaft 17 is provided with a first crank lever 18.

A connecting element 19 is connected to the first toggle lever 18. One end of the link 19 is connected to the first crank lever 18, and the other end of the link 19 is connected to the piston member 20. The connecting member 19 transmits the movement of the movable shaft 17 to the piston member 20. The rotational movement of the movable shaft 17 is converted into the linear movement of the piston member 20 by the first crank lever 18 and the link 19.

A piston member 20 is connected to the connecting member 19. The piston member 20 performs forward movement and backward movement (up-down movement). The piston member 20 is constituted by a rod-shaped conductor.

The outer case 10 is provided with a ground terminal 45. The ground terminal 45 may be made of a material having excellent conductivity, such as aluminum (Al) or copper (Cu). The ground terminal 45 is inserted into the outer case 10 through the outer case 10. That is, the inner end of the ground terminal 45 is disposed inside the outer case 10, and the outer end of the ground terminal 45 is disposed outside the outer case 10. The ground terminal 45 is also called an earth bushing. A portion exposed to the outside of the outer case 10 in the ground terminal 45 may be protected by an insulating member. The outside of the ground terminal 45 is connected to an external ground terminal (not shown).

A bus bar 46 connecting the ground terminal 45 and the piston member 20 is provided.

One end of the bus bar 46 is connected to the inner end of the ground terminal 45, and the other end of the bus bar 46 is connected to the movable portion holder 51.

A support member 55 for supporting the movable part 50 is provided. The supporting member 55 is fixed and disposed inside the outer box 10.

The movable portion base 51 is provided on the support member 55. The movable portion base 51 is provided through the support member 55. The bus bar 46 is connected to the upper end of the movable portion holder 51. A movable contact 52 is provided at the lower end of the movable portion holder 51. The movable contact 52 may be constituted by a plurality of chips arranged in a circle (radially). A first wear ring 53 is provided between the movable portion seat 51 and the piston member 20.

When the piston member 20 moves downward and comes into contact with the fixed portion 40, the current remaining in the first conductor 14 is discharged to the outside through the fixed portion 40, the piston member 20, the movable contact 52, the movable portion holder 51, the bus bar 46, and the ground terminal 45.

The air blowing mechanism includes a movable shaft 17 (a mechanism for transmitting force from the driving unit to the piston member may be used in addition to this), a piston member 20, a cylinder member 30, a fixed plate 60, and a floating plate 70. Reference is primarily made to fig. 4 to 6.

A cylinder member 30 is provided at a lower portion of the support member 55. The cylinder member 30 may be formed in a cylindrical shape. The cylinder member 30 provides a space for the piston member 20 to be inserted and moved. The piston member 20 linearly moves while penetrating the cylinder member 30 in the longitudinal direction.

The top surface of the cylinder member 30 is open to form an open portion 31. The piston member 20, the movable contact 52, the movable portion holder 51, the fixed plate 60, the movable plate 70, and the like are inserted and provided through the opening 31.

A cylinder bore 32 through which the piston member 20 can move (move in and out) in the longitudinal direction (vertical direction) is formed in the bottom surface of the cylinder member 30. At this time, a second wear ring 35 may be provided in the cylinder bore 32. The piston member 20 reduces wear by the second wear-resistant ring 35 and slides via the cylinder bore 32.

A plurality of vent holes 33 are radially formed along the circumferential surface in the lower portion of the cylinder member 30. Through the vent hole 33, air outside the cylinder member 30 flows into the cylinder member 30, or air inside the cylinder member 30 flows out to the outside of the cylinder member 30.

The piston member 20 is formed in a circular rod shape. The piston member 20 is connected to the movable shaft 17 through the first crank lever 18 and the link 19 and performs forward/backward movement. The piston member 20 provides the power to send out air by moving the stationary plate 60 and the movable plate 70. In addition, the piston member 20 also functions as a movable member capable of connecting the movable contact 52 and the fixed contact 42. That is, the piston member 20 is formed integrally with the mover.

A lateral hole (21) is formed in the middle portion of the piston member 20. Thereby, the air can move along the lateral holes 21 inside the cylinder member 30. Here, the lateral hole 21 is formed at an upper portion of the fixing plate 60.

A longitudinal hole (longitudinal hole)22 is formed from the lateral hole 21 to a lower end portion in the piston member 20. Thereby, the air inside the cylinder member 30 can flow out to the outside of the cylinder member 30 along the lateral holes 21 and the longitudinal holes 22. That is, the lateral holes 21 and the longitudinal holes 22 become flow paths of air.

The piston member 20 is provided with a fixed plate 60. The fixed plate 60 is provided at the intermediate portion of the piston member 20. The intermediate portion of the piston member 20 may be formed in a stepped shape for easy installation of the fixing plate 60. The fixing plate 60 is formed at a lower portion of the transverse hole 21. Thus, when the fixing plate 60 moves upward, air existing above the fixing plate 60 inside the cylinder member 30 flows out to the outside (lower part) of the cylinder member 30 through the lateral holes 21 and the vertical holes 22.

Since the fixing plate 60 is disposed inside the cylinder member 30, the air inside the cylinder member 30 is pushed to move toward the upper or lower direction in the case where the piston member 20 makes a linear motion in the longitudinal direction.

The fixing plate 60 has a plurality of plate through holes 61. The plate through-hole 61 is formed in the longitudinal direction of the cylinder member 30. Therefore, in the case where the piston member 20 linearly moves in the longitudinal direction, air may flow out through the plate through-hole 61.

Preferably, the outer diameter of the fixing plate 60 is sized close to the inner diameter of the cylinder member 30. A circumferential groove (not shown) is formed along the outer circumferential surface of the fixed plate 60, and a third wear ring 65 is provided in the circumferential groove. The fixed plate 60 slides smoothly along the inner side surface of the cylinder member 30 via the third wear-resistant ring 65.

A floating plate 70 is provided on the fixed plate 60. The traveling plate 70 may be formed in a plate shape in a ring (disk) shape. The outer diameter of the traveling plate 70 is smaller than that of the stationary plate 60. Thereby, the traveling plate 70 can move freely without friction with the inner surface of the cylinder member 30.

The outer diameter of the floating plate 70 may be formed so as to completely cover the plate through-hole 61 when the floating plate 70 contacts the fixed plate 60. Accordingly, when the piston member 20 is lowered, the floating plate 70 is separated from the fixed plate 60 by the pressure of the air flowing through the plate through-hole 61, and when the piston member 20 is raised, the floating plate 70 moves together with the fixed plate 60 in a state where the plate through-hole 61 is closed.

The floating plate 70 is formed with a central hole (not labeled) through which the piston member 20 passes and is disposed. The traveling plate 70 slides along the piston member 20.

A guide portion 71 is formed along the outer periphery of the central portion hole of the floating plate 70. The guide portion 71 is formed as a wall having a predetermined height. The guide portion 71 guides the traveling plate 70 to be smoothly slidable along the piston member 20.

The traveling plate 70 is provided at an upper portion of the fixed plate 60 and moves up and down together with the fixed plate 60 by its own weight. When the fixed plate 60 moves upward, the movable plate 70 is pushed by the fixed plate 60 and moves in contact with the fixed plate 60. When the fixed plate 60 moves downward, the floating plate 70 moves downward while being spaced apart from the fixed plate 60 by a predetermined distance due to the pressure of the air flowing through the plate through hole 61 of the fixed plate 60. When the movement of the fixed plate 60 is stopped, the movable plate 70 is in contact with the fixed plate 60 because there is no air pressure.

The longitudinal direction (operation direction) of the cylinder member 30 and the piston member 20 is a direction other than the horizontal direction. Preferably, the longitudinal direction of the cylinder member 30 and the piston member 20 is a vertical direction. Thus, when the closing operation or the opening operation is completed, that is, when there is no pneumatic pressure, the floating plate 70 is in contact with the fixed plate 60 and closes the plate through hole 61.

The operation of the fast grounding switch of the gas insulated switchgear according to an embodiment of the present invention will be described with reference to fig. 6 to 9.

First, the closing action will be explained.

Fig. 6 shows an open state. Since the piston member 20 serving as a mover is moved upward by the movable shaft 17, the piston member 20 is separated from the fixed contact 42. That is, since the movable contact 52 and the fixed contact 42 are disconnected, the ground circuit is opened.

The lower end of the piston member 20 is positioned in the cylinder hole 32 of the cylinder member 30, and the fixing plate 60 is positioned above the cylinder member 30. The floating plate 70 is in contact with the upper portion of the fixed plate 60.

Fig. 7 shows the closing progress state. The piston member 20 moves downward by the rotation of the movable shaft 17. When the fixed plate 60 moves downward together with the piston member 20, air at the lower portion of the fixed plate 60 flows out of the cylinder member 30 through the vent hole 33. The air in the lower portion of the fixed plate 60 moves upward through the plate through-hole 61 and acts as a force for pushing the movable plate 70 upward. Therefore, the floating plate 70 moves downward while being spaced apart from the fixed plate 60 by a predetermined distance. As described above, when the piston member 20 moves downward, that is, when the piston member is closed, air in the cylinder member 30 located below the fixing plate 60 flows out through the cylinder hole 32 and the plate through hole 61, and thus the reaction acting on the piston member 20 is minimized.

Fig. 8 shows a state where the closure is ended. The lower end of the piston member 20 is in contact with the fixed contact 42, so that the ground circuit is connected. The movement of the fixed plate 60 is stopped, and the traveling plate 70 is in contact with the upper portion of the fixed plate 60. Here, the fixing plate 60 is located at a position close to the lower end of the cylinder member 30 but above the cylinder hole 32.

Next, the opening operation will be described.

Fig. 8 shows the closed state. The ground circuit is in a connected state. The floating plate 70 is in contact with the upper portion of the fixed plate 60. The fixing plate 60 is disposed at a position above the cylinder bore 32, close to the lower end of the cylinder member 30.

Fig. 9 shows the open proceeding state. The piston member 20 is moved upward by the reverse rotation of the movable shaft 17. The fixed plate 60 moves upward together with the piston member 20. Since the floating plate 70 is in contact with the upper portion of the fixed plate 60, the plate through hole 61 of the fixed plate 60 is closed. Therefore, the air above the stationary plate 60 and the traveling plate 70 flows out to the outside (lower portion) of the cylinder member 30 through the lateral holes 21 and the longitudinal holes 22 of the piston member 20. That is, air inside the cylinder member 30 is sent out from the lower portion of the piston member 20, and wind is blown to the contact portion, particularly the fixing portion 40. Thereby, the arc generated by the separation of the piston member 20 and the fixed contact 42 is extinguished. The arc cutting performance is improved.

On the other hand, air outside the cylinder member 30 flows into the cylinder member 30 through the cylinder hole 32, thereby preventing the pressure of the lower portion of the fixing plate 60 from becoming small. Thereby, the moving speed of the piston member 20 is prevented from being lowered.

When the opening operation is completed, the state of the opening is completed as shown in fig. 6.

According to the rapid grounding switch of the gas insulated switchgear of an embodiment of the present invention, since the air blowing mechanism for blowing air to the fixing portion when the switch is opened is provided, it is possible to rapidly extinguish the arc. Thereby, the arc cutting performance is ensured regardless of the type of the insulating gas.

Here, the piston member applied to the blower mechanism is formed integrally with the mover, thereby improving the arc interruption performance without particularly increasing the number of parts or the space occupied.

Further, the air-sending means includes a fixed plate, a floating plate disposed so as to be spaced apart from the fixed plate, and air flow holes formed in the fixed plate and the cylinder member, so that not only can the flow of air blown out to the fixed portion be ensured, but also the moving speed of the piston member functioning as the mover can be prevented from being lowered.

(second embodiment)

Referring to fig. 10 and 11, a fast grounding switch of a gas insulated switchgear according to another embodiment of the present invention will be described.

This embodiment is different from the previous embodiments in that the piston member 160 is configured independently of the movable mover 120.

The fixing portion 140 including the fixing portion holder 141, the fixing contact 142, and the fixing portion shield 143 is provided on the first conductor 114.

The movable portion 150 including the movable portion holder 151, the movable contact 152, and the movable portion shield 153 is provided to the first support member 155. The movable portion 150 is disposed to be spaced apart from the fixed portion 140.

The bus bar 146 is connected to a ground terminal (ground bushing) 145 provided in the outer case 110 and the movable portion holder 141.

The movable element 120 is connected to the movable shaft 116 via a first crank lever 117. The movable element 120 is provided to penetrate the movable portion 150. The movable element 120 connects or disconnects the movable portion 150 and the fixed portion 140 by rotation of the movable shaft 116, and further connects or disconnects the ground circuit.

The cylinder member 130 is provided to the second support member 156 (or another portion of the first support member). The cylinder member 130 is provided at a position spaced apart from the mover 120 by a predetermined distance. An injection hole 131 is formed in the lower portion of the cylinder member 130. The injection hole 131 is formed to face a direction in which the fixing part 140 is provided.

The piston member 160 is inserted into and disposed on the cylinder member 130. The piston member 160 includes: a piston rod 161 connected to a second crank lever 118 provided on the movable shaft 116; and a piston plate 162 coupled to a lower end of the piston rod 161 and sliding inside the cylinder member 130.

The second crank lever 118 protrudes toward a direction opposite to the first crank lever 117, so that the moving directions of the movable mover 120 and the piston member 160 are opposite to each other. That is, when the movable shaft 116 rotates in the clockwise direction, the mover 120 moves downward and the piston member 160 moves upward. On the contrary, when the movable shaft 116 rotates counterclockwise, the mover 120 moves upward and the piston member 160 moves downward.

The opening operation in this example will be described specifically below.

In the closed state shown in fig. 10, when the movable shaft 116 rotates counterclockwise and the movable element 120 moves upward, the movable element 120 is separated from the fixed portion 140. Thereby, the ground circuit is opened. At this time, the piston member 160 moves downward, so that the air inside the cylinder member 130 is injected toward the fixing portion 140 through the injection hole 131. The arc generated between the fixed portion 140 and the mover 120 is extinguished by the air injected through the injection hole 131.

(third embodiment)

Referring to fig. 12 and 13, a fast grounding switch of a gas insulated switchgear according to another embodiment of the present invention will be described.

This embodiment is different from the first embodiment in that the piston member 220 is connected to the first conductor 214 as a main circuit, and the fixing portion 240 is connected to the ground terminal 245. The piston member 220 and the cylinder member 30 are almost the same in configuration as in the first embodiment.

As the movable shaft 217 rotates, the piston member (movable element) 220 connects or disconnects the movable portion 250 and the fixed portion 240, thereby connecting or disconnecting the ground circuit.

The fixed plate 260 and the movable plate 270 are provided to the piston member 220 in the same manner as in the first embodiment.

Since the closing and opening actions in this embodiment are similar to those in the first embodiment, a detailed description thereof will be omitted. When the arc extinguishing operation is performed, the arc generated at the fixing portion 240 is extinguished by the air sent from the piston member 160.

The embodiments described above are intended to realize the embodiments of the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to illustrate, and the scope of the technical idea of the present invention is not limited by such embodiments. That is, the scope of the present invention is defined by the appended claims, and all technical ideas within the scope equivalent to the scope of the present invention are included in the scope of the present invention.