KR101779721B1 - High-speed closing switch - Google Patents

Abstract

The high-speed closing switch according to the embodiment includes: a casing sealed inside; A ground electrode formed inside the case; A high voltage electrode disposed inside the case and spaced apart from the ground electrode by a predetermined distance; A movable electrode installed in the case and moving between a ground electrode and a second position where the high voltage electrode is connected to each other at a first position where the ground electrode and the high voltage electrode are not connected to each other; A coil formed below the movable electrode to generate an electromagnetic force such that the movable electrode is moved from the first position to the second position in response to power application; And a return rod having one end fixedly connected to the movable electrode and the other end protruding outside the case.

Description

[0001] HIGH-SPEED CLOSING SWITCH [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high-speed closing switch, and more particularly to a high-speed closing switch in which a rod (ROD) connected to a movable electrode protrudes to the outside and can return the position of the movable electrode to a home position.

Generally, the switchgear is a facility that receives power and distributes the power of the special high voltage to low pressure in order to supply the power required by the load facility installed in each power consumer. Normally, there is a switch, a lightning arrester, a transformer, And various measuring instruments.

The high-speed turn-on switch inside the switchgear is a device that cuts off the current when an accident such as opening or closing a line occurs. In addition to abnormal condition such as short circuit, It is a protection device.

In order to maintain the internal insulation state, the high-speed closing switch constitutes a blocking part insulated with an insulator inside a tank-shaped metal container filled with SF6, which is a tasteless, odorless, and non-toxic inert insulating gas having excellent insulating characteristics.

That is, the high-speed closing switch has a structure in which a high voltage electrode, a ground electrode, and a movable electrode are located inside a case made of an insulating material such as epoxy. The high-speed closing switch also includes a coil for moving the movable electrode to the closing position (electrical closing), and a position sensor for detecting the opening and closing states of the movable electrode.

In the switchgear, the high-voltage electrode of the high-speed input switch is connected to the busbar of the switchgear and is always supplied with high-voltage power. The grounding electrode is a separate grounding busbar or grounding cable, which is connected to the system or grounding point through the switchboard.

Such a high-speed closing switch is also disclosed in Patent Document 1.

The movable electrode in the standby state is located at the ground electrode side in an open state. When a closing command is transmitted by a signal of an arc protection system or the like, a pulse current flows in the coil to repel the movable electrode, The movable electrode is electrically connected to the high voltage electrode and the ground electrode so as to be energized. In this case, for the high-speed charging operation, the movable electrode does not have a separate shaft configuration from the outside, but moves only by itself, and its position is determined by an electrical signal from the outside of the case through an electrical contact sensor.

Further, when returning to the open state after accomplishing the above-mentioned charging purpose, the returning rod of the movable electrode is gripped and returned by the returning rod.

At this time, when the movable electrode returns to the original position, the return rod is placed in the initial standby state.

The return of the movable electrode of the conventional high-speed closing switch is performed through the separate return rod, but the position of the return rod is always maintained at the initial position except for the situation where the movable electrode is returned. Therefore, the position of the return rod and the position of the movable electrode do not coincide with each other.

According to the above-mentioned prior art, the return rod does not move in conjunction with the movement of the movable electrode, but moves selectively only when returning the movable electrode.

(Patent Document 1) KR10-2010-0063556 A

According to an embodiment of the present invention, there is provided a high-speed turn-on switch including a rod connected to a movable electrode protruding outside the case and moving in conjunction with movement of the movable electrode.

Further, in the embodiment, there is provided a high-speed closing switch including a high-voltage electrode formed with an insertion groove into which a cylindrical movable electrode is inserted during a closing operation.

Further, in the embodiment, a high-speed closing switch including a rod whose degree of protrusion to the outside of the case changes in accordance with the position of the movable electrode is provided.

In addition, the embodiment provides a high-speed closing switch which can easily confirm the position of the movable electrode outside the high-speed closing switch without using a separate sensor.

Further, in the embodiment, a high-speed closing switch having a function of confirming the number of times of inputting of a high-speed closing switch and an interlocking function is provided.

It is to be understood that the technical objectives to be achieved by the embodiments are not limited to the technical matters mentioned above and that other technical subjects not mentioned are apparent to those skilled in the art to which the embodiments proposed from the following description belong, It can be understood.

The high-speed closing switch according to the embodiment includes: a casing sealed inside; A ground electrode provided inside the case; A high voltage electrode disposed inside the case and spaced apart from the ground electrode by a predetermined distance; A movable electrode installed in the case and movable between a first position where the ground electrode and the high voltage electrode are connected to each other and a second position where the ground electrode and the high voltage electrode are connected to each other; A coil formed below the movable electrode to generate an electromagnetic force such that the movable electrode is moved from the first position to the second position in response to power application; And a return rod having one end fixedly connected to the movable electrode and the other end protruding outside the case.

The movable electrode may include a moving part having a hollow therein and a flange part provided at one end of the moving part and having a through hole into which one end of the return rod is inserted, Is inserted into the through hole of the flange portion and fixedly connected to the movable electrode.

Further, the high-voltage electrode includes an insertion groove into which the movable portion of the movable electrode is inserted, and when the movable electrode moves from the first position to the second position, at least a part of the moving portion is inserted into the insertion groove .

When the movable electrode moves from the first position to the second position, the high-voltage electrode has a first portion surrounding the inner circumferential surface of the moving portion about the insertion groove, and a second portion surrounding the outer surface of the moving portion .

The length of the portion of the return rod projecting out of the case in a state where the movable electrode is in the first position is larger than the length corresponding to the distance that the movable electrode moves from the first position to the second position.

The case includes an upper case and a lower case, an upper case that hermetically closes an open upper portion of the body and is coupled with the high-voltage electrode, a lower case that hermetically opens the lower portion of the body, And a lower case coupled thereto.

The apparatus further includes a pipe having one end coupled to the ground electrode and the other end coupled to the lower case.

Further, the inside of the case is filled with at least one inert gas of SF6, N2, or air from which moisture has been removed, and is sealed with the outside.

The apparatus further includes a sensor located outside the case and counting the number of movements of the return rod.

The sensor further includes a contact sensor that does not contact the return rod when the movable electrode is placed in the first position and contacts the return rod when the movable electrode has moved to the second position.

The apparatus further includes interlock means, which is located outside the case and selectively connected to the return rod exposed to the outside of the case to restrict movement of the return rod.

The return rod may include a first portion located inside the case and a second portion exposed to the outside of the case, and when the movable electrode moves from the first position to the second position, The length of the first portion of the return rod increases and the length of the second portion of the return rod decreases.

In the embodiment, a returning mechanism driven by a motor or the like is connected to the rod by providing a rod moving in conjunction with movement of the movable electrode while being connected to the movable electrode, It is possible to reduce the cost of the product due to the fact that it is not necessary to provide an additional return rod.

Further, in the embodiment, the rod connected to the movable electrode protrudes to the outside of the case, and the degree of protrusion of the rod changes according to the position of the movable electrode, so that the position of the movable electrode can be intuitively confirmed visually from the outside .

Further, in the embodiment, when the moving member of the cylindrical movable electrode is inserted into the insertion groove of the high-voltage electrode during the closing operation of the high-speed closing switch, the contact pressure between the movable electrode and the high-voltage electrode can be further strengthened, The high voltage electrode can be quickly and safely connected to the ground electrode when an accident current is generated, thereby improving the reliability.

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In addition, in the embodiment, the number of times of movement of the rod protruding out of the case is directly connected to the number of times the movable electrode is inserted, thereby counting the number of times the movable electrode is inserted outside the high-speed closing switch, Interlock function can be provided.

1 is a general schematic diagram of a switchboard according to an embodiment of the present invention.
2 is a block diagram illustrating a fast closing switch according to an embodiment of the present invention.
3 is a view showing an open state of a high-speed closing switch according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating a state of closing the high-speed closing switch according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. Like parts are designated with like reference numerals throughout the specification. Whenever a portion of a layer, film, region, plate, or the like is referred to as being "on" another portion, it includes not only the case where it is "directly on" another portion, but also the case where there is another portion in between. Conversely, when a part is "directly over" another part, it means that there is no other part in the middle.

1 is a general schematic diagram of a switchboard according to an embodiment of the present invention.

1, the switchboard 1 includes an arc extinguishing system 2, a transformer 3, a main breaker 4, a current sensor 5, a first breaker 6, a second breaker 7, And includes a high-speed turn-on switch 100 according to the present invention.

As a method for coping with an arc occurring in the switchboard, one can consider that when a control system (not shown) of the switchboard 1 detects an arc generated in the interior thereof, a trip signal is transmitted to the main breaker 4, The high-speed closing switch 100 is operated. Then, the high-speed turn-on switch 100 bypasses the arc fault current to the ground, thereby minimizing the damage that may occur due to the arc inside the switchgear. After that, the main breaker (4) cuts off the fault current to completely solve the accident and protects the power transmission and distribution system.

In order to determine whether or not an arc accident has occurred, a light receiving sensor for receiving light emitted from an arc generated in the inside of the switchboard is installed to transmit an optical signal sensed by a light receiving sensor in the event of an arc accident, The overcurrent signal from the current sensor is transmitted to the system body, and the control system can determine whether or not an arc accident has occurred based on the above conditions. Alternatively, the two signals may be simultaneously transmitted to determine whether or not an arc accident has occurred.

In the event of an arc accident, the control system transmits a signal to the main breaker (4). However, since the time required for the main breaker is relatively long, about 50 ms, it can not respond to an arc accident quickly, A closing switch is necessary. In other words, since the arc reaches the maximum temperature (20,000K) and the pressure (2 × 105Pa) in 10 to 15 ms after the occurrence, it is possible to use a dedicated high speed A closing switch is required.

2 is a block diagram illustrating a fast closing switch according to an embodiment of the present invention.

2, the high-speed closing switch 100 includes a case 110 forming an outer frame, a pipe 120 formed inside the case 110, A high voltage electrode 140 formed in the case 110, a movable electrode 150 formed in the case 110, a coil 160 formed inside the case 110, And a return rod 170 partially formed in the case 110 and connected to the movable electrode 150 and the remaining part of which protrudes to the outside of the case 110.

The case 110 may be sealed inside so as to be filled with insulating gas.

To this end, the interior of the case 110 may be open at the top and bottom as in the embodiment.

The case 110 includes a body 111 constituting a case, an upper case 112 formed on an upper portion of the body 111 to cover an open top of the body 111, And a lower case 113 formed at a lower portion of the body 111 so as to cover an opened lower portion of the body 111. [

The upper case 112 may be formed integrally with the high voltage electrode 140. Alternatively, the upper case 112 may be formed separately from the high voltage electrode 140 in the upper case 112.

According to this configuration, the inside of the case 110 can be sealed by inserting the upper case 112 and the lower case 113 after filling the inside of the body part 111 with insulating gas.

However, the configuration in which the inside of the case 110 is sealed so as to be filled with the insulating gas is not limited to the above-described example, and any well-known configuration is possible. The insulating gas filled in the case 110 is not particularly limited, and any known gas may be used as long as it is an insulating gas.

For example, the inside of the case 110 is filled with an inert gas and is sealed with the outside of the case, and the inert gas filled in the case 110 is preferably made of SF6, N2, or moisture-free air.

The case 110 as described above may be installed in the water front, the switchboard, or the above-described switchboard or the like.

A pipe 120 is provided on the lower case 113 to surround the ground electrode 130.

The pipe 120 has a hollow cylindrical shape. The ground electrode 130 is coupled to the upper portion of the hollow inner surface. The lower portion of the pipe 120 is coupled to the lower case 113.

The pipe 120 is formed to surround the ground electrode 130. At this time, the pipe 120 protects the ground electrode 130 by wrapping the ground electrode 130, and is made of a conductor, and serves as a conductor.

A ground electrode 130 is coupled to the pipe 120.

The ground electrode 130 may be provided under the case 110.

At this time, the ground electrode 130 has a hollow inside, so that the movable electrode 150, which will be described later, can move to the inside of the hollow, and the outer surface of the movable electrode 150 .

Further, the high voltage electrode 140 may be integrated with the upper case 112 as described above. Therefore, the high voltage electrode 140 may be provided on the upper portion of the case 110.

Alternatively, the high voltage electrode 140 may be coupled to the upper case 112 by a separate member from the upper case 112.

The high voltage electrode 140 is formed with an insertion groove 141 into which the movable electrode 150, which will be described later, can be moved and inserted.

The hollow inner wall of the movable electrode 150 in which the hollow 151 is formed when the movable electrode 150 is inserted by the insertion groove 141 of the high voltage electrode 140 and the hollow inner wall of the movable electrode 150, 150 are all enclosed.

This will be described in more detail below.

The configuration in which the high voltage electrode 140 and the ground electrode 130 are provided apart from each other in the case 110 is not limited to that described above, and any well-known configuration is possible.

The high voltage electrode 140 may be electrically connected to at least any one of the above-mentioned water circuit, the switchboard, and the switchboard, and the ground electrode 130 may be connected to the ground.

The movable electrode 150 is provided movably within the case 110.

That is, the movable electrode 150 is disposed at the open position where the ground electrode 130 and the high voltage electrode 140 are not connected to each other, and the ground electrode 130 and the high voltage electrode 140, Can be moved between the input positions that are connected to each other.
The open position may be referred to as the first position, and the insertion position may be referred to as the second position.

For this, the movable electrode 150 may be provided to be movable to the upper portion of the case 110 while being in contact with the hollow inner wall of the ground electrode 130.

The movable electrode 150 may include a moving part 152 and a flange part 153.

The moving part 152 of the movable electrode 150 can move while being in contact with the hollow inner wall of the ground electrode 130. The moving part 152 can be partially inserted into the insertion groove 141 of the high voltage electrode 140 when the moving part 152 is moved to the closing position.

When the moving part 152 is inserted into the insertion groove 141 of the high voltage electrode 140, the flange part 153 of the movable electrode 150 is connected to the ground electrode 130 You can take it. To this end, the flange portion 153 of the moving portion 152 may be larger in diameter than the moving portion 152.

A coil 160 is provided under the case 110. Coil 160 may be a Thomson coil.

The Thomson coil 160 may generate an electromagnetic force when power is applied. For this purpose, the Thomson coil 160 can be wound in a ring shape.

When power is applied to the Thompson coil 160, a current flows through the coil wound in the ring shape, and an electromagnetic force can be generated.

As described above, the movable electrode 150 can be moved from the open position to the closing position by the electromagnetic force generated by the Thomson coil 160.

The Thompson coil 160 may be provided on a support member 180 disposed on the upper surface of the lower case 113 of the case 110.

The flange portion 153 of the movable electrode 150 may be positioned on the Thomson coil 160.

The flange portion 153 of the movable electrode 150 may have a shape corresponding to the Thomson coil 160.

Therefore, the electromagnetic force generated by the Thomson coil 160 can easily act on the flange portion 153 of the moving portion 152. [

At this time, if power is not applied to the Thomson coil 160, the flange part 153 of the moving part 152 is positioned on the Thomson coil 160 by its own weight. In other words, when power is not applied to the Thomson coil 160 as described above, the movable electrode 150 is placed in the open position

When the Thomson coil 160 is energized, the movable electrode 150 is positioned at the closing position, so that the high voltage electrode 140 and the ground electrode 130 can be connected to each other. The electric circuit of the water front or the switchboard or the switchboard is connected to the ground side by the high voltage electrode 140, the ground electrode 130 and the movable electrode 150. If an accident current such as an arc is generated in the electric circuit, the fault current can bypass the electric circuit and flow to the ground side quickly. Accordingly, it is possible to protect electric circuits such as an electric power source, a switchboard, a switchboard, etc. from an accident current such as an arc.

The configuration of the Thompson coil 160 is not particularly limited, and any well-known configuration is possible as long as the movable electrode 150 can be moved by generating an electromagnetic force when a power source is applied.

The return rod 170 has one end coupled to the movable electrode 150 and the other end protruding outside the case 110.

One end of the return rod 170 is inserted through the through hole 114 of the lower case 113 and the through hole 181 of the support member 180 and then a known coupling means such as a bolt 200, To be supported on the bottom surface of the movable electrode 150.

A through hole 181 through which the return rod 170 passes is formed in the lower case 113 of the case 110. The return rod 170 is inserted into the through hole 181, The movable electrode 150 is fixedly connected to the movable electrode 150, and the remaining part of the movable electrode 150 protrudes outside the case 110.

At this time, a through hole 154 is formed in the flange 153 of the movable electrode 150. The bolt 200 is passed through the through hole 154, (170) is fastened.

Accordingly, when the movable electrode 150 moves to the closing position, the return rod 170 moves to the upper side of the case 110 in conjunction with the movement of the movable electrode 150.

At this time, even when the movable electrode 150 moves to the closing position, a part of the return rod 170 protrudes outside the case 110.

The length of a portion of the return rod 170 protruding from the case 110 is greater than the distance that the movable electrode 150 moves from the open position to the closing position within the case 110 .

One end of the return rod 170 is connected to the movable electrode 150 and the return rod is moved to the inside of the case in conjunction with the movement of the movable electrode 150, A portion of the return rod 170 can be protruded to the outside of the case 110 so that the movable electrode can be returned to its original position by using the return rod 170 .

In addition, in the embodiment, the return rod 170 connected to the movable electrode 150 is protruded to the outside of the case 110, and the degree of protrusion of the return rod 170 changes according to the position of the movable electrode 150 Therefore, the position of the movable electrode 150 can be intuitively confirmed visually from the outside.

The movable electrode 150 has a cylindrical shape in which a hollow 151 is formed. However, the shape of the movable electrode 150 is not limited to this, and may have a rectangular tube shape or a polygonal tube shape having the hollow 151 formed therein as described above.

The high voltage electrode 140 is formed with an insertion groove 141 into which the movable electrode 150 is inserted and a contact (not shown) contacting the upper surface of the movable electrode 150 is formed in the insertion groove 141 Respectively. At this time, the contactor is disposed on a contact surface that contacts the upper surface of the movable electrode 150.

The high voltage electrode 140 has the insertion groove 141 so that a part of the high voltage electrode 140 is inserted into the hollow 151 of the movable electrode 150. [ And the other part of the movable electrode 150 is disposed so as to surround the outer surface of the movable electrode 150.

In other words, when the movable electrode 150 is inserted into the insertion groove 141 of the high voltage electrode 140, the high voltage electrode 140 is electrically connected to the movable electrode 150 And surrounds the outer surface of the movable electrode 150. [0064]

Accordingly, when the moving member 152 of the cylindrical movable electrode 150 is inserted into the insertion groove 141 of the high-voltage electrode 140 during the closing operation of the high-speed closing switch, the movable electrode 150 and the high- 140 can be further strengthened and a shorter current path can be ensured so that the high voltage electrode 140 can be quickly and safely connected to the ground electrode 130 at the time of occurrence of a fault current, thereby improving reliability.

Meanwhile, in the embodiment, a contact sensor (not shown) may be formed on the lower surface of the lower case 113, that is, outside the case 110.

In this case, the contact sensor does not contact the return rod 170 when the movable electrode 150 is placed in the open position, and when the movable electrode 150 moves to the closing position, 170).

Accordingly, the number of times the return rod 170 contacts the contact sensor can be counted, and the number of times the high-speed closing switch is turned on can be counted.

That is, in the embodiment, the number of movements of the return rod 170 protruding out of the case 110 is directly connected to the number of times the movable electrode 150 is inserted, whereby the number of times the movable electrode 150 is inserted outside the high- You can count.

A fixing means (not shown) for fixing the position of the return rod 170 is formed in the lower portion of the lower case 113 while restricting the movement of the return rod 170 protruding to the outside.

The fixing means operates in a case where the operation of the high-speed closing switch is restricted, thereby restricting the movement of the return rod 170.

In other words, an interlock switch is mounted to the outside of the case 110 so as to be connected to the outwardly projecting return rod 170, thereby restricting the movement of the return rod 170 based on the interlock switch .

FIG. 3 is a view showing an open state of a high-speed closing switch according to an embodiment of the present invention, and FIG. 4 is a view showing a closing state of a high-speed closing switch according to an embodiment of the present invention.

3 and 4, a contact element is formed on the hollow inner circumferential surface of the ground electrode 130 so as to contact the movable electrode 150 to allow electrical conduction.

When the movable electrode 150 is placed in the open position, the return rod 170 protrudes to the outside of the case 110 by a first length H1.

At this time, when the movable electrode 150 moves to the closing position, the return rod 170 moves together with the movable electrode 150 into the case 110.

Accordingly, the return rod 170 protrudes to the outside of the case 110 with a portion of the second length H2 whose length is reduced by the distance that the movable electrode 150 has moved in the first length.

At this time, a motor (not shown) is connected to the return rod 170 protruding to the outside, so that the return rod 170 is moved downward, and the movable rod 170 fixedly connected to one end of the return rod 170 The electrode 150 can be moved to the open position.

The return electrode 170 is connected to the movable electrode 150 and moves in conjunction with the movement of the movable electrode 150 so that the return electrode 170 can be used to move the movable electrode 150, It is possible to reduce the product cost due to no need to provide an additional return rod.

In addition, in the embodiment, the return rod 170 connected to the movable electrode 150 is protruded to the outside of the case 110, and the degree of protrusion of the return rod 170 changes according to the position of the movable electrode 150 Therefore, the position of the movable electrode 150 can be intuitively confirmed visually from the outside.

In the embodiment, the movable portion 152 of the cylindrical movable electrode 150 is inserted into the insertion groove 141 of the high-voltage electrode 140 during the closing operation of the high-speed closing switch, so that the movable electrode 150 and the high- The voltage of the electrode 140 can be further strengthened, and a shorter energizing path can be ensured.

The number of times of movement of the return rod 170 projecting out of the case 110 is directly connected to the number of times the movable electrode 150 is inserted so that the number of times the movable electrode 150 is inserted outside the high- And may provide an interlock function through the externally projecting return rod 170. [

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

100: High-speed closing switch
110: Case
120: pipe
130: ground electrode
140: high voltage electrode
150: movable electrode
160: Thomson coil
170: return rod

Claims (8)

A case whose interior is sealed;
A ground electrode provided inside the case;
A high voltage electrode disposed inside the case and spaced apart from the ground electrode by a predetermined distance;
A movable electrode which is installed in the case and moves between a first position where the ground electrode and the high voltage electrode are not connected to each other and a second position where the ground electrode and the high voltage electrode are connected to each other;
A coil provided below the movable electrode to generate an electromagnetic force such that the movable electrode is moved from the first position to the second position upon application of power;
A return rod having one end fixedly connected to the movable electrode and the other end projecting to the outside of the case; And
And a sensor located outside the case and counting the number of movements of the return rod,
The movable electrode
A moving part having a hollow formed therein; And
And a flange portion provided at one end of the moving portion and having a through hole,
One end of the return rod
And is fixed to a lower portion of the flange portion by being fastened by a bolt passing through the through hole
High speed closing switch. The method according to claim 1,
Further comprising an interlock switch connected to a return rod protruding to the outside of the case so as to limit the movement of the return rod, the interlock switch being provided outside the case. The method according to claim 1,
The high-
And an insertion groove into which at least a part of the movable portion of the movable electrode is inserted when the movable electrode moves from the first position to the second position,
When the movable electrode moves from the first position to the second position, at least a part of the moving portion is inserted into the insertion groove
High speed closing switch. The method of claim 3,
Wherein the high voltage electrode includes a first portion surrounding the inner circumferential surface of the moving portion of the movable electrode about the insertion groove and a second portion surrounding the outer circumferential surface of the moving portion of the moving portion of the movable electrode, Lt; RTI ID = 0.0 >
High speed closing switch. The method according to claim 1,
The length of the portion of the return rod projecting out of the case in a state where the movable electrode is in the first position,
The movable electrode being larger than a length corresponding to a distance of movement of the movable electrode from the first position to the second position
High speed closing switch. The method according to claim 1,
In this case,
A body portion having upper and lower openings,
An upper case which hermetically closes an open upper portion of the body portion and is coupled to the high voltage electrode,
And a lower case for sealing an open lower portion of the body portion and engaging with the ground electrode
High speed closing switch. delete The method according to claim 1,
The sensor includes:
And a contact sensor that does not contact the return rod when the movable electrode is in the first position and contacts the return rod when the movable electrode has moved to the second position
High speed closing switch.

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