KR102644731B1 - 29kV GIS System with Humidity Maintenance - Google Patents

Abstract

The present invention relates to a 29kV gas insulated switch system equipped with a humidity maintenance function that can monitor the humidity inside the gas insulated switch (GIS) of a power substation facility and remove internal moisture as necessary.
A 29kV gas insulated switch system equipped with a humidity maintenance function according to the present invention to solve the above problems includes an enclosure of a predetermined size having an accommodating space therein; an insulating gas injection unit located on one side of the enclosure and selectively supplying insulating gas into the interior of the enclosure; a gas suction part located on one side of the enclosure and sucking the insulating gas inside the enclosure when the insulating gas is charged through the insulating gas injection part; a moisture removal unit located between the enclosure and the gas suction unit and located at a relatively higher position than the enclosure to store insulating gas and air inside the enclosure; a humidity sensing unit installed on one side of the moisture removal unit to detect humidity in the air or insulating gas stored inside the moisture removal unit; And a control unit that controls the operation of the insulating gas injection unit and the gas suction unit according to the humidity value detected in real time by the humidity sensing unit to charge and discharge the insulating gas into the interior of the enclosure.

Description

29kV gas insulated switch system with humidity maintenance function {29kV GIS System with Humidity Maintenance}

The present invention relates to a 29kV gas insulated switchgear system equipped with a humidity maintenance function. More specifically, it can monitor the humidity inside the gas insulated switchgear (GIS) of power substation equipment and maintain the humidity in a certain range. It is about a 29kV gas insulated switch system equipped with a humidity maintenance function to maintain moisture.

In general, gas insulated switchgear (hereinafter referred to as GIS) uses the excellent physical properties of SF6 (hereinafter referred to as 'insulating gas'), an inert gas in power substation facilities, to switch and close currents in normal conditions as well as short circuits. It is a complex mechanical device that protects the system by safely opening and closing even in abnormal conditions such as accidents.

These gas-insulated switches are filled with SF6 gas and contain switches such as circuit breakers, disconnectors, and earthing switches, current transformers, and instrument transformers inside a grounded metal enclosure. It consists of auxiliary devices such as a Voltage Transformer and a Lightning Arrester. When a discharge occurs due to insulation breakdown due to moisture, the insulation is damaged, causing a short circuit, and ultimately causing a breakdown of the substation equipment.

Therefore, various technologies are being developed to detect partial discharge due to electrical breakdown, and the conventional technology for this purpose is the gas insulated switch partial discharge detection device and method disclosed in Patent Publication No. 2021-0129007 (hereinafter referred to as 'patent document'). This is disclosed.

The patent document includes a sensor unit including a plurality of electromagnetic wave sensors disposed at different positions of the gas insulated switch and detecting electromagnetic waves; a high-frequency switch unit that controls the movement path of the electromagnetic wave signal transmitted from the sensor unit through a switching operation; a partial discharge determination unit that receives an electromagnetic wave signal from the high-frequency switch unit and analyzes a pattern of the electromagnetic wave signal to determine whether a partial discharge occurs in the gas insulated switch; and a location calculation unit that receives the electromagnetic wave signal from the high-frequency switch unit and calculates the location of the electromagnetic wave detected by the sensor unit using the electromagnetic wave detection points of the sensor unit.

However, the above patent document detects a partial discharge signal occurring inside a gas insulated switch, and has a problem in that it does not solve the fundamental problem of partial discharge occurring.

Meanwhile, conventionally, in order to remove moisture inside the gas-insulated switch, moisture is removed by providing a desiccant inside the gas-insulated switch, but there is a problem in that the moisture inside the gas-insulated switch cannot be completely removed with just such a desiccant.

In other words, even though the vacuum process time in the gas insulated switch current transformer section takes three times longer than in other sections, the insulating gas is being injected in the presence of moisture, and as a result, a vacuum below the specified value cannot be formed. Since insulating gas is injected, there is a problem that more moisture is released due to self-heating of the current transformer (CT) when operating the gas-insulated switch, and as a result, safety accidents occur due to insulation destruction caused by moisture present in the current transformer section of the gas-insulated switch. There is a problem that occurs and the lifespan of the current transformer is shortened.

Therefore, there is a need to develop a gas-insulated switch with an improved structure so that the humidity inside the gas-insulated switch can be monitored in real time and inject and discharge insulating gas for humidity control even during use as needed.

KR 10-2021-0129007 A (2021. 10. 27.) KR 10-2021-0043915 A (2021. 04. 22.) KR 10-2019-0099801 A (2019. 08. 28.) KR 10-1938189 B1 (2019. 01. 08.)

The present invention was created to solve the problems of the conventional gas insulated switch as described above. The problem that the present invention aims to solve is to monitor the humidity inside the gas insulated switch (GIS) of the power substation facility and adjust the humidity as needed. It provides a 29kV GIS system equipped with a humidity maintenance function that can remove internal moisture.

A 29kV GIS system equipped with a humidity maintenance function according to the present invention to solve the above problems includes an enclosure of a predetermined size having an accommodating space therein; an insulating gas injection unit located on one side of the enclosure and selectively supplying insulating gas into the interior of the enclosure; a gas suction part located on one side of the enclosure and sucking the insulating gas inside the enclosure when the insulating gas is charged through the insulating gas injection part; a moisture removal unit located between the enclosure and the gas suction unit and located at a relatively higher position than the enclosure to store insulating gas and air inside the enclosure; a humidity sensing unit installed on one side of the moisture removal unit to detect humidity in the air or insulating gas stored inside the moisture removal unit; And a control unit that controls the operation of the insulating gas injection unit and the gas suction unit according to the humidity value detected in real time by the humidity sensing unit to charge and discharge the insulating gas into the interior of the enclosure.

Another feature of the present invention is that a flow path blocking portion is further provided between the enclosure and the moisture removal unit to block insulating gas and air flowing into the moisture removal unit from re-introducing the enclosure.

In addition, the present invention provides an upper housing having a cross-sectional shape of a “ㄷ” shape where the flow path blocking portion has an open bottom; a lower housing formed in a "ㄷ" cross-sectional shape with an open upper surface and assembled to the bottom of the upper housing; and a weight body installed inside the upper and lower housings to block the flow path by its own weight, wherein a ring-shaped sealing member is installed on the bottom surface so as to protrude downward, and on the top surface, the inside of the upper housing Another feature is that a plurality of protrusions are formed to be spaced apart from the upper surface.

According to the present invention, the temperature and humidity inside the gas insulated switch of the power substation facility are monitored in real time, and when necessary, the charged insulating gas (SF6) is taken out to the outside to remove the moisture inside, and at the same time, the inside of the enclosure is removed. Since the insulating gas is recharged, the gas insulation performance is guaranteed even during long-term use.

Figure 1 is a configuration diagram showing an example of a 29kV gas insulated switch system equipped with a humidity maintenance function according to the present invention.
Figure 2 is a diagram showing an example of a moisture removal unit according to the present invention.
Figure 3 is a diagram showing an example of a flow path blocking portion according to the present invention.
Figures 4 and 5 are views showing examples of wet absorption portions according to the present invention.

Hereinafter, the present invention will be described in detail according to the accompanying drawings showing preferred embodiments.

The present invention seeks to provide a 29kV gas insulated switch system equipped with a humidity maintenance function that can monitor the humidity inside a gas insulated switch (GIS) of a power substation facility and remove internal moisture as needed. As shown in FIG. 1, the invention includes an enclosure (10), an insulating gas injection unit (20), a gas suction unit (30), a moisture removal unit (40), a flow path blocking unit (50), a humidity detection unit (60), It includes a control unit 70 and a moisture absorption unit 80.

The enclosure 10 includes switches such as circuit breakers, disconnectors, and grounding switches, and auxiliary devices such as current transformers, instrument transformers, and lightning arresters, and is configured to protect the switches and auxiliary devices from external forces.

As shown in FIG. 1, this enclosure 10 is provided with an inlet 11 through which insulating gas is injected through an insulating gas injection part 20, which will be described later, on one lower side, and the inside of the enclosure 10 is charged on one upper side. An outlet 12 is provided to discharge the insulating gas and remaining air to the outside.

At this time, a check valve (not shown) is installed at the inlet 11 to prevent the insulating gas injected into the enclosure 10 through the insulating gas injection part 20 from flowing back in the reverse direction (injection direction). do.

Additionally, an exhaust guide 13 may be installed on the inner upper surface of the enclosure 10 to guide the flow of insulating gas toward the exhaust port 12.

Through the above configuration, the inside of the enclosure (10) is completely filled with insulating gas and is completely sealed to maintain a sealed state. At the same time, when necessary, insulating gas is injected into the enclosure (10) to replenish it during use. It becomes possible.

The insulating gas injection unit 20 is configured to inject an appropriate amount of insulating gas into the interior of the enclosure 10 through the control of the control unit 70, which will be described later.

As shown in FIG. 1, the insulating gas injection unit 20 is composed of a tank (no reference numeral) having a predetermined size and storing the insulating gas inside, and the inlet 11 of this tank and the enclosure 10. It is connected through a pipe (no reference numeral), and a supply pump 21 is installed on the pipe to selectively supply the insulating gas stored in the tank.

At this time, the insulating gas is composed of hexafluoride (SF9), which is widely used as an insulating gas in insulated switchgear due to its excellent insulating properties, thermal stability, and non-flammability properties.

In addition, the supply pump 21 is driven and stopped under the control of the control unit 70, and a pressure detection sensor (not shown) that detects the remaining amount of the stored insulating gas through changes in internal pressure is further installed in the tank. You can.

At this time, when the internal pressure of the tank detected by the pressure sensor reaches below the initially set reference pressure, the charging of insulating gas is guided into the inside of the tank through the control unit 70, or the insulating gas stored in the dehumidifying unit 100, which will be described later, is It can be controlled to automatically charge.

The gas suction unit 30 is configured to blow out the insulating gas and remaining air filled inside the enclosure 10 to the outside and maintain the enclosure 10 in a sealed state in which only the insulating gas exists as a gas.

As shown in FIG. 1, this gas suction unit 30 may be configured as a vacuum suction device connected to the outlet 12 of the enclosure 10 through a pipe (no reference numeral), and this gas suction unit 30 ) may be configured to operate automatically under the control of the control unit 70.

At this time, the gas suction unit 30 is installed with a first outlet valve (V1) and a check valve (CV1) connected to the first outlet (42C) of the moisture removal unit 40, which will be described later, and a second outlet (44C) A connected second discharge valve (V2) and a check valve (CV2) are installed, and the first and second discharge valves (V1, V2) may be configured to automatically open and close under the control of the control unit 70.

The moisture removal unit 40 is located between the enclosure 10 and the gas intake unit 30 and removes the moisture contained in the insulating gas and remaining air discharged through the outlet 12 of the enclosure 10 and the enclosure 10. ) It is a configuration that prevents moisture in the air from affecting the components installed inside the enclosure (10) by allowing the air remaining inside to remain above the relatively heavy insulating gas.

This moisture removal unit 40 has a vertical predetermined length as shown in FIG. 2 and includes a first connector 41 whose lower end is connected to the outlet 12 of the enclosure 10, and the first connector A first storage housing 42 of a predetermined size, the upper end of which is connected to one side of the bottom of the first storage housing 42, and a second connector 43 that is connected to the other bottom of the first storage housing 42 and has a predetermined length vertically. and a second storage housing 44 of a predetermined size connected to one lower side of the second connection pipe 43.

And the first storage housing 42 is formed so that the top plate 42A has an inclined surface at a predetermined angle upward from the first connection pipe 41 toward the second connection pipe 43, and the bottom plate 42B is formed at the first connection pipe 41. It is formed to have an inclined surface at a predetermined angle downward from the connection pipe 41 toward the second connection pipe 43, and the first storage housing is located on one side (the inclined upper side) of the upper plate 42A of the first storage housing 42. A first outlet 42C is provided for blowing out the gas (insulating gas, residual air, etc.) stored in 42 to the outside.

In addition, the second storage housing 44 is formed so that the top plate 44A has an inclined surface at a predetermined angle upward in the opposite direction from the second connection pipe 43, and the bottom plate 44B is formed with the second connection pipe (44A). 43) It is formed to have a slope at a predetermined angle that slopes downward in the opposite direction.

And on one side (sloped upper side) of the upper plate 44A of the second storage housing 44, there is a second outlet for blowing out the gas (insulating gas, residual air, etc.) stored inside the second storage housing 44 to the outside. (44C) is formed, and an installation hole 44D of a predetermined size is formed on one side (sloping lower side) of the floor plate 44B, and a humidity sensing unit 60 is installed in the installation hole 44D, The humidity inside the second storage housing 44 is sensed through the humidity sensing unit 60 and transmitted to the control unit 70.

In addition, a moisture absorption unit 80, which will be described later, may be further installed in a detachable manner on the second connection pipe 43, and moisture contained in the gas stored inside the moisture removal unit 40 may be removed through the moisture absorption unit 80. This is absorbed.

After the insulating gas is charged into the enclosure 10 according to the specified pressure through the configuration of the moisture removal unit 40 as described above, some residual air, which is relatively lighter than the insulating gas, is discharged through the outlet of the enclosure 10 (12). ) is stored on the side of the moisture removal unit 40, and as a result, only insulating gas is induced to exist inside the enclosure 10, thereby ensuring insulation, thermal safety, and non-flammability inside the enclosure 10.

In addition, when air remains inside the moisture removal unit 40, it is located close to the upper plates 42A and 44A of the first and second storage housings 42 and 44, respectively, due to the relatively heavy insulating gas. As a result, air naturally gathers toward the higher end of the upper plates (42A, 44A), and as a result, when the insulating gas is vacuum-sucked from the gas suction section (30) through the first and second outlets (42C, 44C), preferential As a result, the air remaining inside is blown out to the outside.

The flow path blocking unit 50 is configured to block the insulating gas and air flowing into the moisture removal unit 40 from flowing back into the enclosure 10.

As shown in FIGS. 1 and 3, the flow path blocking portion 50 is formed of an upper housing 51 in a “ㄷ” cross-sectional shape with an open bottom and a “ㄷ” cross-sectional shape with an open upper surface. It includes a lower housing 52 assembled to the bottom of the upper housing 51 and a weight body 53 installed inside the upper and lower housings 51 and 52 to block the flow path by its own weight.

At this time, upper and lower discharge holes 51A and 52A having a predetermined diameter are formed in the middle portion of the upper housing 51 and lower housing 52, and the diameter of the lower discharge hole 52A is formed on the bottom of the weight body 53. A ring-shaped sealing member 53A, which is relatively large compared to the above, is installed to protrude downward at a predetermined height, and on the upper surface of the weight body 53, the inner surface of the upper housing 51 and the upper surface of the weight body 53 are spaced at a predetermined distance. A plurality of protrusions 53B are formed radially to be spaced apart.

In addition, the weight body 53 is formed to be relatively smaller than the size of the internal space formed by the upper and lower housings 51 and 52, and larger than the diameter of the upper and lower discharge holes 51A and 52A, through which the lower When the gas flowing into the interior through the lower discharge hole 52A of the housing 52 passes upward through the upper discharge hole 51A of the upper housing 51, the weight 53 is affected by the pressure of the gas and the gas. As the sealing member 53A is raised to a predetermined height by the vacuum suction force acting on the suction unit 30, the sealing member 53A is spaced apart from the inner bottom surface of the lower housing 52, so that the flow path communicates and flows.

In addition, when the vacuum suction force of the gas suction unit 30 does not act, the sealing member 53A is maintained in close contact with the inner bottom surface of the lower housing 52 due to the weight of the weight 53, As a result, the insulating gas and air in the enclosure 10 are structurally blocked from flowing into the moisture removal unit 40 or from the moisture removal unit 40 into the enclosure 10.

The humidity detection unit 60 is installed on one side of the moisture removal unit 40 and detects humidity in the air or insulating gas stored inside the moisture removal unit 40. This humidity detection unit 60 detects moisture The humidity inside the removal unit 40 is detected in real time and transmitted to the control unit 70.

The control unit 70 controls the operation of the insulating gas injection unit 20 and the gas suction unit 30 according to the humidity value detected in real time by the humidity sensing unit 60 to automatically inject the insulating gas into the enclosure 10. It is composed of charging and discharging.

At this time, when the humidity detected by the humidity sensing unit 60 exceeds the set reference humidity, the control unit 70 controls the insulating gas injection unit 20 and the gas suction unit 30 to remove the enclosure 10 and the moisture removal unit 40. ) is taken out to the outside, and at the same time, the insulating gas stored in the tank of the insulating gas injection unit 20 is supplied to the inside of the enclosure 10.

In addition, a temperature sensor (not shown) may be further provided inside the enclosure 10, and when the temperature of the insulating gas charged inside the enclosure 10 rises above the set reference temperature, the insulating gas is injected. By controlling the unit 20 and the gas suction unit 30, the insulating gas is charged into the enclosure (10), and at the same time, the insulating gas charged inside the enclosure (10) is taken out to the outside to be filled inside the enclosure (10). The temperature of the insulating gas can be controlled to remain below a set standard temperature.

The moisture absorption unit 80 is detachably installed inside the second connection pipe 43 of the moisture removal unit 40 to remove moisture inside the moisture removal unit 40.

As shown in FIG. 4, the moisture absorbing portion 80 includes a moisture absorbing housing 81 of a predetermined size that is inserted into the interior through a hole (no reference numeral) of a predetermined diameter formed on one side of the second connection pipe 43. , and includes a sliding case 82 of a predetermined size that is inserted into the moisture-absorbing housing 81 and installed to be able to slide outward.

In addition, a through hole 81A of a predetermined size is formed at one end of the moisture absorption housing 81 (direction inserted into the second connection pipe 43), and a through hole 81A is formed at one end of the sliding case 82. A communication hole (82A) is formed along the outer surface in accordance with the position of.

In addition, a guide groove (81B) having a relatively large diameter compared to the sliding case (82) is formed inside the moisture-absorbing housing (81), and at one end of the sliding case (82) a diameter corresponding to the guide groove (81B) is formed. A sealing member 82B made of rubber having a is installed.

In addition, a fixing flange (81C) of a predetermined diameter is formed in the moisture-absorbing housing (81) to be closely attached to and fixed to the second connector (43), and the hole of the second connector (43) is formed through this fixing flange (81C). It is welded in close contact with the circumference or fixed through a fastening member.

When the sliding case 82 is pulled out of the moisture-absorbing housing 81 as shown in FIG. 5 through the above configuration, the positions of the through hole 81A and the communication hole 82A are offset from each other, and the sealing member ( Internal airtightness is maintained by 82B), and in this state, the desiccant can be easily replaced by inserting the desiccant into the sliding case (82) and then inserting the sliding case (82) into the interior of the moisture-absorbing housing (81). In this process, the insulating gas stored in the moisture removal unit 40 is prevented from being discharged to the outside.

At this time, in order to prevent the sliding case 82 from being arbitrarily pulled outward due to the internal pressure of the moisture removal unit 40, the sliding case 82 is screwed together with the moisture absorption housing 81 and is configured to be drawn in and out. Alternatively, a fixing member (not shown) that fixes the position of the sliding case 82 may be additionally installed.

From above, the insulating gas stored in the tank of the insulating gas injection part 20 is injected into the inside of the enclosure 10, and the insulating gas and air inside the enclosure 10 and the moisture removal part 40 are released through the gas suction part 30. It has been explained that the insulating gas and air sucked into the gas suction unit 30 are cooled through the cooling unit 90, and the cooled insulating gas is dehumidified through the dehumidification unit 100. Next, the insulating gas can be configured to circulate through the enclosure (10) by resupplying it to the tank of the insulating gas injection unit (20).

Here, the cooling unit 90 is composed of an air-cooled cooling unit 90 that cools the temperature of the insulating gas through heat exchange with the outside air, or a cooling unit 90 having a refrigeration cycle consisting of evaporation, compression, condensation, and expansion. It may be configured to cool by exchanging heat with the refrigerant.

At this time, the cooling unit 90 may collect moisture (condensation water) generated in the process of cooling the insulating gas and discharge it to the outside through a separate drain pipe (not indicated).

In addition, supply pumps 91 and 101 for supplying insulating gas are provided on the pipe connecting the gas suction unit 30, the cooling unit 90, the dehumidifying unit 100, and the insulating gas injection unit 20, respectively. An insulating gas supply valve (V3) that opens and closes the flow path is installed on the pipe between the insulating gas injection unit (20) and the supply pump (101), and the insulating gas supply valve (V3) is controlled by the control unit (70). It can be configured to automatically open and close.

As described above, the present invention monitors the temperature and humidity inside the gas insulated switch of the electric power substation facility in real time, and when necessary, the charged insulating gas is taken out to the outside to remove the inside moisture, and at the same time, the temperature and humidity inside the gas insulated switch of the power substation facility are monitored in real time. Since the insulating gas is recharged, the performance of gas insulation is guaranteed even during long-term use.

Above, for convenience of explanation, reference numerals and names have been given to the drawings showing preferred embodiments and the configurations shown in the drawings. However, this is an embodiment according to the present invention, and the shapes shown in the drawings and the names given are The scope of the rights should not be construed as limited, and changes to various shapes predictable from the description of the invention and simple substitution with a configuration that performs the same function are within the scope of changes that can be easily carried out by a person skilled in the art. You will see this as extremely self-evident.

10: enclosure 11: inlet
12: outlet 13: outlet guide
20: Insulated gas injection part 21: Supply pump
30: gas suction part 40: moisture removal part
41: first connector 42: first storage housing
42A: Top plate 42B: Bottom plate
42C: first outlet 43: second connector
44: Second storage housing 44A: Top plate
44B: Bottom plate 44C: Second outlet
44D: Installer 50: Flow blocking unit
51: upper housing 51A: upper discharge hole
52: Lower housing 52A: Lower discharge hole
53: Weight body 53A: Sealing member
53B: Protrusion 60: Humidity sensing unit
70: control unit 80: moisture absorption unit
81: Moisture absorption housing 81A: Through hole
81B: Guide groove 81C: Fixed flange
82: sliding case 82A: communication hole
82B: sealing member 90: cooling unit
91: Supply pump 100: Dehumidification unit
101: Supply pump CV1, CV2: Check valve
V1: 1st outlet valve V2: 2nd outlet valve
V3: Insulated gas supply valve

Claims (3)

An enclosure (10) of a predetermined size having an accommodating space therein;
an insulating gas injection unit 20 located on one side of the enclosure 10 and selectively supplying insulating gas into the interior of the enclosure 10;
A gas suction part 30 located on one side of the enclosure 10 and sucking the insulating gas inside the enclosure 10 when the insulating gas is charged through the insulating gas injection part 20;
A moisture removal unit 40 located between the enclosure 10 and the gas suction unit 30 and located at a relatively higher position than the enclosure 10 to store insulating gas and air inside the enclosure 10;
A humidity detection unit 60 installed on one side of the moisture removal unit 40 to detect humidity in the air or insulating gas stored inside the moisture removal unit 40; and
The operation of the insulating gas injection unit 20 and the gas suction unit 30 is controlled according to the humidity value detected in real time by the humidity sensing unit 60 to charge and discharge the insulating gas into the interior of the enclosure 10. A control unit 70 that commands;
Including,
The moisture removal unit 40,
A first connector 41 that has a vertical length of a predetermined length and whose lower end is connected to the outlet 12 of the enclosure 10;
A first storage housing (42) of a predetermined size where the upper end of the first connection pipe (41) is connected to one side of the bottom surface;
A second connection pipe (43) connected to the other side of the bottom of the first storage housing (42) and having a vertical predetermined length; and
A second storage housing (44) of a predetermined size connected to one lower side of the second connection pipe (43);
Includes,
Between the enclosure 10 and the moisture removal unit 40,
A flow path blocking unit 50 is provided to block the insulating gas and air introduced into the moisture removal unit 40 from re-introducing the enclosure 10,
In the moisture removal unit 40,
A moisture absorption unit 80 is installed to be detachable and removes internal moisture.
The moisture absorption portion 80 is,
Moisture absorption housing (81) of a predetermined size;
A sliding case (82) of a predetermined size that is inserted into the moisture-absorbing housing (81) and installed to be able to slide outward;
Including,
At one end of the moisture-absorbing housing 81,
A through hole (81A) of a predetermined size is formed,
At one end of the sliding case 82,
A communication hole (82A) is formed along the outer surface in accordance with the position of the through hole (81A),
Inside the moisture-absorbing housing 81,
A guide groove (81B) is formed with a relatively large diameter compared to the sliding case (82),
At one end of the sliding case 82,
A 29kV gas insulated switch system with a humidity maintenance function, characterized in that a rubber sealing member (82B) having a diameter corresponding to the guide groove (81B) is installed.
delete In claim 1,
The flow path blocking portion 50,
An upper housing (51) with an open bottom and a “L” cross-sectional shape;
A lower housing (52) formed in a “ㄷ” cross-sectional shape with an open upper surface and assembled to the bottom of the upper housing (51); and
A weight body 53 installed inside the upper and lower housings 51 and 52 to block the flow path by its own weight;
Including,
The weight body 53 is,
A ring-shaped sealing member (53A) is installed on the bottom to protrude downward, and a plurality of protrusions (53B) are formed on the upper surface to be spaced apart from the inner upper surface of the upper housing (51). 29kV gas insulated switch system.

Images