KR100932232B1 - Compressed air puffer-type load breake switch(lbs) with a housing - Google Patents

Abstract

PURPOSE: An LBS(Load Breaker Switch) for extinguishing an arc using the compressed air is provided to prevent global warming and reduce carbon generation by excluding the greenhouse gas. CONSTITUTION: A fixing terminal(20) is formed in an upper side of a housing(10). A puffer cylinder(50) is a cylindrical metal tube. The puffer cylinder has a movable terminal(30) corresponding to the fixing terminal. A rotary rod(40) is rotatably mounted in the puffer cylinder to move the movable terminal up and down. A first rotation axis rotates the rotation rod. A fixing piston is installed in the puffer cylinder. When the puffer cylinder moves down, the fixing piston compresses the air of the puffer cylinder. A slide terminal is slidably connected to the outer circumference of the puffer cylinder.

Description

Compressed Air Puffer-Type Load Breake Switch (LBS) With A Housing}

The present invention relates to a load switch, and more particularly, a housing-type compressed air extinguishing type load switch using a high-pressure compressed air generated in the puffer cylinder for moving the arc generated between the fixed terminal and the movable terminal up and down. It is about.

Switchgear is installed between power supply and load equipment to open and close electric line. It is generally divided into disconnector and load breaker. A disconnection switch (Disconnection Switch) is to open and close the converter in the state of no current or near the current, and Load Break Switch (LBS) is to open and close the current in the current flow state.

Load switch is classified into inlet switch (OCB), vacuum switch, magnetic switch (MBB), air switch (ACB), SF ₆ gas switch (GCB) according to the type of medium extinguishing arc generated between the contacts. Among these, SF ₆ gas switch is mainly used. However, sulfur hexafluoride gas (SF ₆ ) is a representative greenhouse gas along with carbon dioxide (CO ₂ ) and methane (CH ₄ ).

On the other hand, the load breaker can be divided into a rotary type, a rotary type and a slide type according to the method of moving the movable contact. For example, a rotary load switch is a method in which a movable contact rotates to contact or separate a fixed contact, and a rotary load switch is a method in which a movable contact installed between the fixed contacts rotates and sequentially contacts or disconnects a fixed contact. In the slide type, the movable contact moves in a straight line to contact or separate the fixed contact.

In general, the rotational load switch is difficult to install inside the sealed housing because of the large movement radius of the movable contact, and the movable contact and the fixed contact are exposed to the air, thus occupying a lot of installation space to secure the inter-phase insulation distance. On the other hand, the rotary load switch has a small radius of motion of the movable contact, which is advantageous to install inside a sealed housing and can fill SF ₆ gas with insulation. However, if an accident occurs due to external factors such as ground or short circuit, There is a fear that the pressure switch will explode, causing the load switch to explode. The slide-type load switch has a relatively small radius of motion of the movable contact and can be installed in a sealed housing to fill the SF ₆ gas. The fixed electrode and the movable electrode are made of sulfur hexafluoride gas (SF ₆ ) filled therein. It is supposed to extinguish the arc generated in between. However, since the hexafluorofluoride gas, which is an insulating gas, does not completely extinguish the arc, the arc is extinguished by a puffer method using sulfur hexafluoride gas.

1 is a partial cross-sectional view showing a load switch of a puffer extinguishing method using a conventional sulfur fluoride gas. As shown, the fixed terminal 601, the movable terminal 602 disposed opposite to the fixed terminal 601 to be in contact with the fixed terminal 601, for driving the movable terminal 602 to the fixed terminal side and the opposite side A first and a second connected to the drive shaft 611, the fixed piston 612, the fixed cylinder 612 to slide on the fixed piston 612, and the puper cylinder 613 and surrounding the movable terminal 602. Insulation nozzles 614 and 615 are included. The fixed piston 612, the drive shaft 611, and the puffer cylinder 613 interact with each other to form the puffer chamber 617 in the puffer cylinder 613.

The second gas passage 618 is formed between the first and second insulating nozzles 614 and 615 and communicates with the thermal puffer chamber 620. The thermal puffer chamber 602 is separated from the puffer chamber 617 by a partition member 625 provided inside the puffer cylinder 613. The first gas passage 619 is formed between the movable terminal 602 and the first insulating nozzle 614 and between the movable terminal 602 and the partition member 625. The first gas passage 619 communicates with the puffer chamber 617.

When the drive shaft 611 is driven to the right, the contact between the movable terminal 602 and the fixed terminal 601 is separated, the arc 626 is generated between the two terminals. In relation to the rightward movement of the drive shaft 611, the extinguishing gas of the puffer chamber 617 is compressed to a high pressure. In addition, the extinguishing gas in the thermal puffer chamber 620 is also heated by the thermal energy of the arc 626 to become a high pressure.

Thereafter, the high-pressure extinguishing gas in the puffer chamber 617 is blown onto the arc 626 through the first gas passage 619, and the extinguishing gas in the thermal puffer chamber 620 is also the second gas passage 618. Blowing onto the arc 226 through) performs extinguishing.

However, since the conventional puffer extinguishing load switch is filled with sulfur hexafluoride gas (SF ₆ ), which is a greenhouse gas, there is a problem in countering global warming. Accordingly, it is required to develop an environmentally friendly load switch that does not use sulfur hexafluoride gas (SF ₆ ).

The main object of the present invention is to provide an environmentally friendly load switch without using the fluorinated gas (SF ₆ ) that is a greenhouse gas.

In addition, the present invention is to provide a load switch for extinguishing arc generated between the fixed terminal and the movable terminal by using air compressed at high pressure.

The present invention also provides a load switch comprising a drive means for quickly moving the perp cylinder to compress the air inside the perp cylinder to a high pressure.

In addition, the present invention is to provide a load switch is provided with a housing so as to be easy to install in the switchgear and to prevent a safety accident of the operator.

As a means for achieving the object of the present invention, the housed compressed air arc-type load switch according to the present invention, the housing is a fixed terminal formed on the upper end and the outside air freely flows; A per cylinder formed of a metal cylinder with a movable terminal corresponding to the fixed terminal; A rotatable rod rotatably installed on a pu cylinder to move the movable terminal up and down; A first rotating shaft for rotating the rotating rod; A fixed piston installed inside the percylinder to compress the air in the percylinder when the percylinder moves downward; A slide terminal slidably connected to an outer circumferential surface of the puffer cylinder; Characterized in that it comprises a pull-out bus bar connected to the slide terminal.

In the present invention, the housing is an upper case fixed to the fixed terminal, the middle case is coupled to the lower end of the upper case to accommodate the rotation rod, and the lower case is coupled to the lower end of the intermediate case and the upper cylinder is moved up and down Is done.

The rotating rod includes a rod portion having a predetermined length connected to the puffer cylinder so as to be stretchable in the longitudinal direction, and a cylindrical rod portion integrally coupled to the first rotation shaft through a coupling groove to rotate together with the first rotation shaft.

An insulating nozzle having a nozzle hole in which a fixed terminal is closely inserted is installed at an upper end of the puffer cylinder.

A movable terminal in contact with the fixed terminal is installed in the center of the insulating nozzle, and a lower end of the movable terminal is connected to the metal cylinder of the puffer cylinder.

The insulation nozzle is provided with a compressed air passage for guiding the air compressed in the puffer chamber to the tip of the movable terminal.

The slide terminal consists of an annular metal plate having a hole through which the puffer cylinder penetrates, and an elastic contact portion provided on the bottom of the annular metal plate and composed of a plurality of metal pieces and a spring band. One side of the annular metal plate is integrally formed with a vertical bending portion in which the draw-out bus bar is installed.

The fixed piston is composed of a piston that is slidably installed in the metal cylinder of the puffer cylinder, and a fixed rod for fixing the piston.

An annular conductive plate is formed on the lower portion of the periphery cylinder to form a conductive ring coated with an insulating material while surrounding the outer side of the periphery cylinder, and a through hole through which the periphery penetrates the periphery to be electrically connected to the slide terminal. It is composed.

The cylindrical part of the lower case is formed with a see-through hole for observing the current position of the puffer cylinder.

A power fuse electrically connected to the drawing booth bar may be further installed in the drawing booth bar.

One side of the lower case may be further provided with a link member acting by a protruding pin installed on the top of the power fuse.

A ground fixing terminal for grounding the residual current is further installed at the lower end of the drawing booth bar.

According to the present invention, by not using the SF ₆ gas, which is a greenhouse gas, it is possible to meet the policy for preventing warming and reducing carbon generation.

The present invention uses an open housing, arc extinguished by using compressed air at high pressure, and by operating the movable terminal in a sliding manner can minimize the size and lower the price.

The load switch according to the present invention rotates the rotational rod to separate the movable terminal and the fixed terminal, and simultaneously lowers the puffer cylinder to compress the air in the puffer chamber, and injects the compressed air to the tip of the movable terminal. In addition to arc extinguishing between the fixed terminals, the hot heat gas generated by the arc is quickly discharged to the outside through the gas outlet formed at the top of the nozzle hole and the upper case.

When the load switch of the present invention rotates the rotating rod and connects the movable terminal and the fixed terminal, the current is transmitted to the secondary side through the slide terminal and the draw-out bar that are always in contact with the metal cylinder of the puffer cylinder, and is generated around the puffer cylinder. The eddy current is removed through the conduction ring with the draw-out bus bar to prevent the transmission efficiency from dropping.

In addition, the load breaker of the present invention by using a power fuse installed in parallel with the draw-out bus bar, when the draw current is flowing in the draw-out bus bar, automatically disconnects the movable terminal and the fixed terminal to protect the equipment installed in the rear end, the movable terminal If the and the fixed terminal are separated, the worker's safety is ensured by removing the current by connecting the ground movable terminal connected with the ground bus bar to the ground fixed terminal installed at the bottom of the draw-out bus bar.

In addition, the load switch of the present invention allows the operator to check the current position of the puffer cylinder through a see-through hole formed at the bottom of the housing, so that the operator can check whether the safety is visible to the naked eye.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a housed compressed air extinguishing load switch according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a partial cross-sectional view showing a compressed air extinguishing type load switch in a housing according to the present invention, Figure 3 is a full cross-sectional view showing both the outlet bus bar and the power fuse installed in the compressed air extinguishing type load switch in accordance with the present invention, 4 and 5 are partially enlarged cross-sectional views of FIG. 2.

As shown, the compressed air extinguishing type load switch 1 (hereinafter referred to as 'load switch') according to the present invention includes a housing 10 in which the rotating rod 40 and the percylinder 50 are accommodated. It is configured by.

The housing 10 is formed by injection molding an insulating plastic into a cylindrical shape. The housing 10 is an intermediate case accommodating an upper case 11 having a fixed terminal 20 fixed to an upper end thereof, and a rotating rod 40 coupled to the lower end of the upper case 11 to rotate clockwise or counterclockwise. 12 and the lower case 13 is coupled to the lower end of the intermediate case 12 and the periphery cylinder 50 moves up and down.

The upper case 11, the intermediate case 12 and the lower case 13 are combined with each other to form a bowling pin-shaped housing 10. In this case, the intermediate case 12 and the lower case 13 are coupled using a bolt and a plurality of ventilation holes are formed so that external air can flow freely into the housing 10.

The outer circumferential surface of the housing 10 has a plurality of corrugated protrusions 14 are formed to reduce the insulation distance, and on one side of the housing 10 to secure a space for the rotation rod 40 to rotate clockwise or counterclockwise The triangular protrusion 15 is formed. The triangular protrusion 15 is formed at the lower end of the upper case 11 and the upper end of the middle case 12. At the distal end of the triangular protrusion 15, a horizontal through hole 3a is formed through which the first rotating shaft 3 penetrates horizontally.

Rotating rod 40 is formed with a coupling groove 44 corresponding to the cross-sectional shape of the first rotary shaft 3 is integrally coupled to the first rotary shaft (3). Therefore, when the first rotation shaft 3 rotates, the rotation rod 40 also rotates in the same direction. And when the rotation rod 40 is rotated, the puffer cylinder 50 connected to the other end is moved up and down.

The fixed terminal 20 extends a predetermined length from the upper end of the upper case 11 in the shape of a rod. The movable terminal 30 is installed inside the upper end of the puffer cylinder 50 so as to be coupled to the fixed terminal 20. The movable terminal 30 is a tulip terminal into which the fixed terminal 20 is inserted and electrically contacted.

The puffer cylinder 50 is composed of a cylindrical metal cylinder 51. And an insulating nozzle 60 is installed on the upper end of the puffer cylinder (50). The insulating nozzle 60 is formed by molding an insulating plastic, a nozzle hole 61 into which the fixed terminal 20 is closely inserted is formed at an upper end thereof, and an internal space 62 in which the movable terminal 30 is installed. Is formed. Preferably, the insulating nozzle 60 is formed of a cylinder having a multi-stage shape, the diameter of which is increased toward the top.

The lower end of the insulating nozzle 60 is sealed by the partition wall 63, and the compressed air passage 64 is formed on the side surface of the movable terminal 30. The compressed air passage 64 guides the compressed air from the puffer chamber 54 between the piston 52 and the partition 63 to be injected toward the tip of the movable terminal 30.

The lower end of the movable terminal 30 is connected to the inner circumferential surface of the metal cylinder 51 of the puffer cylinder 50. Therefore, when the movable terminal 30 and the fixed terminal 20 is in contact with the current flows to the puffer cylinder (50). Subsequently, when the movable terminal 30 and the fixed terminal 20 are separated, an arc is generated between the movable terminal 30 and the fixed terminal 20. Arcs are generated in the internal space 62 of the insulating nozzle 60.

A slide terminal 80 is installed below the puffer cylinder 50. The slide terminal 80 is fixed to the upper end of the lower case (13). The slide terminal 80 is composed of an annular metal plate 82 having a hole through which the periphery cylinder 50 penetrates, and a plurality of metal pieces 83 and a spring band 84 on the bottom surface of the metal plate 82, and the peru cylinder. It consists of a cylindrical elastic contact portion 85 which always elastically contacts the outer circumferential surface of 50. And vertical bending portion 86 is formed integrally on one side of the annular metal plate (82). The withdrawal bus bar 88 is connected to the vertical bent portion 86 of the slide terminal 80. Therefore, the metal cylinder 51 of the puffer cylinder 50 always moves up and down while being electrically connected to the slide terminal 80 to transmit current to the draw-out bus bar 88.

That is, when the puffer cylinder 50 moves upward and the fixed terminal 20 and the movable terminal 30 come into contact with each other, the current drawn through the inlet part bar 21 connected to the fixed terminal 20 is fixed terminal. 20 through the movable terminal 30 and the metal tube 51 and the slide terminal 80 flows to the take-out bus bar 88. On the other hand, if the periphery cylinder 50 is moved downward and the fixed terminal 20 and the movable terminal 30 are separated, the current drawn into the inlet bus bar 21 is blocked so that it does not flow to the outlet bus bar 88. do.

The puffer cylinder 50 vertically moves up and down as the rotation rod 40 rotates clockwise or counterclockwise. For example, when the rotation rod 40 rotates clockwise, the puffer cylinder 50 moves upwards, and when the rotation rod 40 rotates counterclockwise, the puffer cylinder 50 moves downwards vertically. do.

On the other hand, the rotation rod 40 is connected to the first rotary shaft 3 that rotates clockwise or counterclockwise. The rotation rod 40 includes a rod portion 42 having a predetermined length connected to the puffer cylinder 50 and a cylindrical rod 43 integrally connected to the first rotation shaft 3 so as to be expandable and contractable in the longitudinal direction. . The rod part 42 is rotatably connected to the puffer cylinder 50, and the cylindrical rod 43 corresponds to the cross-sectional shape of the first rotary shaft 3 so as to rotate together with the first rotary shaft 3. 44 is formed.

And the cylindrical rod 43 is made of a cylinder so that the free end of the rod portion 42 can be inserted, the linear movement of the rod portion 42 on the outer peripheral surface of the rod portion 42 and the inner peripheral surface of the cylindrical rod 43 Guide protrusions 46 for guiding are formed. Therefore, when the cylindrical rod 43 is rotated to one side by the first rotating shaft 3, the rod portion 42 is rotated up and down with the cylindrical rod 43 and the free end is inserted into the cylindrical rod 43 Since the length is adjusted, it is possible to smoothly vertically move the puffer cylinder 50 up and down.

When the puffer cylinder 50 moves downward according to the rotation of the rotation rod 40 and the movable terminal 30 and the fixed terminal 20 are separated, an arc is formed between the fixed terminal 20 and the movable terminal 30. Occurs. This arc not only damages the fixed terminal 20 and the movable terminal 30 but also causes a safety accident and should be removed promptly.

In this way, it is called subtracting to remove the arc generated between the movable terminal and the fixed terminal when separating the terminal through which the current flows. The present invention is provided with a extinguishing means in the puffer cylinder (50). That is, the present invention is a method of blowing off the arc by using the compressed air generated in the puffer cylinder (50) when the pulp cylinder (50) moves quickly down. The arc blowing method is called a puffing method. In particular, the present invention has a feature of compressing and using air.

The air compression injection type extinguishing means of the present invention includes a piston 52 which is closely installed to be slidable inside the metal cylinder 51 of the puffer cylinder 50, and a fixed rod 53 for fixing the piston 52. And a puff chamber 54 formed between the piston 52 and the insulating nozzle 60 and a compressed air passage 64 formed in the insulating nozzle 60.

The piston 52 is in close contact with the inner circumferential surface of the puffer cylinder 50 is made of a form capable of compressing air. The piston 52 is made of an insulating material so as not to be damaged by an arc. The piston 52 is fixed to the lower end of the lower case 13 through the fixing rod 53. Accordingly, the piston 52 is always located at a constant height regardless of the movement of the puffer cylinder 50.

A puffer chamber 54 is formed between the piston 52 and the insulating nozzle 60, that is, between the upper surface of the piston 52 and the partition 63 of the lower end of the insulating nozzle 60. The puffer chamber 54 is a portion where air is compressed.

Therefore, when the rotation rod 40 rotates and the puffer cylinder 50 moves downward, the piston 52 quickly approaches the insulating nozzle 60 by the relative motion according to the fall of the puffer cylinder 50 and the puffer chamber. (54) The air inside is compressed. Subsequently, the air compressed in the puffer chamber 54 is injected along the compressed air flow path 64 to the tip of the movable terminal 30 to extinguish the arc between the movable terminal 30 and the fixed terminal 20.

The insulating nozzle 60 installed at the tip of the puffer cylinder 50 wraps around the movable terminal 30 and protrudes a predetermined length from the upper end of the puffer cylinder 50, so that the fixed terminal 20 and the movable terminal 30 are Until the separation, that is, until the arc is generated between the fixed terminal 20 and the movable terminal 30 it is possible to sufficiently compress the air inside the puffer chamber (54). Subsequently, when the fixed terminal 20 and the movable terminal 30 are separated and an arc occurs, the compressed air of the puffer chamber 54 is injected toward the distal end of the movable terminal 30 along the compressed air passage 64 to discharge the arc. Soho.

Subsequently, when the puffer cylinder 50 continuously descends and the fixed terminal 20 completely exits the nozzle hole 61, the compressed air of the puffer chamber 54 together with the heat gas inside the insulating nozzle 60 together with the nozzle hole ( Through 61). Compressed air quickly discharges the high temperature heat gas inside the insulating nozzle 60 to prevent the insulating nozzle 60 or the movable terminal 30 from being damaged.

In addition, the heat gas discharged through the nozzle hole 61 of the insulating nozzle 60 is discharged through the gas discharge port 28 provided in the upper case 11 in which the fixed terminal 20 is installed. That is, the fixed terminal part 22 including the rod-shaped fixed terminal 20 is provided at the upper end of the upper case 11. The fixed terminal portion 22 is a cylindrical elastic body consisting of a base portion 26 in which the fixed terminal 20 is integrally installed and an inlet bar 21 is installed, and a plurality of metal pieces 23 and a spring band 24. It consists of a fixed portion (25). The elastic fixing part 25 is elastically coupled to the outer circumferential surface of the puffer cylinder 50 to facilitate the connection between the fixed terminal 20 and the movable terminal 30. As such, the gas outlet 28 is formed in a vertical wall connecting the base portion 26 and the elastic fixing portion 25 to discharge the hot gas injected into the elastic fixing portion 25 to the outside of the housing 10. Let's do it.

As described above, the load switch 1 of the present invention intermittently connects the movable terminal 30 and the fixed terminal 20 by the rotational operation of the rotating rod 40 and also provides air inside the puffer chamber 54. Compressed to high pressure and sprayed to the tip of the movable terminal 30 to extinguish the arc, and to quickly discharge the heat gas of the insulating nozzle 61 and the fixed terminal portion 22 to the outside of the housing 11 by using high pressure air. Can be.

Meanwhile, an eddy current may be generated in the puffer cylinder 50. That is, when an alternating current flows through the metal cylinder 51 of the puffer cylinder 50, a eddy current will generate | occur | produce in the plane perpendicular | vertical to the direction of this electric current. This eddy current has a problem of generating joule heat in the metal cylinder 51 and reducing the efficiency of the current passing through it.

Therefore, in the present invention, by installing the eddy current removal device at the lower end of the intermediate case 12 to prevent the heat generated in the puffer cylinder (50). The eddy current removing device is bent downwardly extending from both ends of the conductive ring 71 spaced apart from the outer side of the puffer cylinder 50 so as to coincide with the plane of the eddy current, and surrounding the outer side of the puffer cylinder 50. It comprises an annular conductive plate 73 is connected to the connection portion and is installed on the bottom surface of the intermediate case (12).

The annular conductive plate 73 is electrically connected to the annular metal plate 82 of the slide terminal 80 which is fixed to the upper surface of the lower case 13 through a bolt. At this time, the conductive ring 71 is coated with an insulating material to prevent the arc from occurring between the metal cylinder (51). Therefore, the eddy current generated around the metal cylinder 51 of the puffer cylinder 50 is removed by the withdrawal bus bar 88 through the conductive ring 71 and the annular conductive plate and the annular metal plate 73, 82.

The lower case 13 includes an upper plate 17 having a stepped portion to allow the slide terminal 80 to be seated thereon, and a cylindrical portion 18 provided with a pipe-shaped space to move the upper cylinder 50 up and down. A fixing bracket 34 for fixing the fixing rod 53 is installed at the lower end of the cylindrical portion 18. The fixing bracket 34 is fixed through the bolt 35 passing through the through hole formed in the cylindrical portion 18 and the fixing rod 53. The fixing bracket 34 is fixed to the take-out bus bar 88.

In addition, the cylindrical portion 18 of the lower case 13 is formed with a see-through hole 19 for observing the current position of the puffer cylinder (50). This see-through hole 19 is installed so that the green strip 19a installed in the lower end of the puffer cylinder 50 can be seen when the puffer cylinder 50 descends. Therefore, when the green strip 19a is seen through the see-through hole 19, the fixed terminal 20 and the movable terminal 30 are separated and the current is cut off, so that the worker can work with confidence.

The vertical bending portion 86 of the slide terminal 80 is exposed to the outside of the lower case 13 through the through groove formed in the upper plate portion 17 of the lower case 13. Lower case 13 is coupled to the intermediate case 12 through a plurality of fastening bolts. At this time, the conductive plate 73 for removing the eddy current and the annular metal plate 82 of the slide terminal 80 are electrically connected. The lead bus bar 88 is connected to the vertical bending portion 86 and extends downward to be installed in parallel with the cylindrical portion 18 of the lower case 13.

Meanwhile, the power fuse 90 may be installed in parallel with the drawing booth bar 88. The power fuse 90 is fixed through the clamp 91 provided in the drawing booth bar 88. The power fuse 90 protrudes upward from the protruding pin 92 provided at the upper end when a fault current flows through the drawing booth bar 88.

One side of the lower case 13 is provided with a link member 94 operated by the protruding pins 92 of the power fuse 90. The link member 94 is rotatably installed on the bracket 95 protruding from one side of the upper plate portion 17 of the lower case 13. The other end of the link member 94 is configured to operate a drive switch (not shown) which drives the first rotating shaft 3 when the protruding pin 92 protrudes so that the link member 94 rotates. Therefore, when the driving switch operates when the fault current is generated and the first rotation shaft 3 rotates, the fixed terminal 20 and the movable terminal 30 are separated according to the rotation of the rotation rod 40 described above, thereby protecting the equipment installed at the rear end. Can be.

Subsequently, a ground fixing terminal 99 is installed at a lower end of the lead bus bar 88 to remove residual current. That is, even when the fixed terminal 20 and the movable terminal 30 are separated and the converter is cut off, the residual current exists in the withdrawal bus bar 88, the puffer cylinder 60, the slide terminal 80, and the like. Accordingly, after the fixed terminal 20 and the movable terminal 30 are separated, the residual current is removed by connecting the ground rotating terminal 120 rotating along the ground movable shaft 110 (Fig. 7) to the ground fixed terminal 99. This can prevent workers from being shocked.

As described above, the load switch 1 according to the present invention by rotating the rotating rod 40 to separate the movable terminal 30 and the fixed terminal 20 at the same time to quickly lower the puffer cylinder (50). Compresses the air in the puffer chamber 54, and sprays the compressed air to the tip of the movable terminal 30 to extinguish the arc between the movable terminal 30 and the fixed terminal 20, and the heat gas generated by the arc It can be quickly discharged to the outside through the gas discharge port 28 formed on the top of the nozzle hole 61 and the upper case (11).

On the contrary, when the load switch 1 of the present invention rotates the rotation rod 40 to connect the movable terminal 30 and the fixed terminal 20, the slide which is always in contact with the metal cylinder 51 of the puffer cylinder 50 is connected. The current is transmitted to the secondary side through the terminal 80 and the drawing booth bar 88, and at the same time, the eddy current generated around the periphery cylinder 50 is removed by the drawing booth bar 88 through the conductive ring 71. It prevents the transmission efficiency from falling.

In addition, the load switch 1 of the present invention, when an abnormal current flows in the draw-out bus bar 88 by using a power fuse (90) installed in parallel with the draw-out bus bar 88, the operating terminal Automatically separate the 30 and the fixed terminal 20 to protect the equipment installed in the rear end, and, if the movable terminal 30 and the fixed terminal 20 is separated, grounding fixed to the lower end of the pull-out bus bar 88 By connecting the ground movable terminal 120 to the terminal 99 to remove the current to ensure the safety of the operator.

And the load switch 1 of the present invention to determine the current position of the puffer cylinder 50 through the see-through hole 19 formed in the lower end of the housing 10 to enable the operator to check whether the safety with the naked eye.

Hereinafter will be described in detail a preferred embodiment of the high-pressure switchboard with a compressed air extinguishing type load switch in accordance with the present invention.

Figure 6 is a schematic perspective view of a high-voltage switchgear equipped with a load switch of the present invention, Figure 7 is a perspective view showing the removal of the drive unit installed on the front of the high-voltage switchgear of Figure 6, Figure 8 is a schematic exploded view showing the drive unit 9 is a sectional view of the driving unit.

As shown, the high-pressure switchboard 100 (hereinafter referred to as 'load switching base') equipped with the housing of the compressed air extinguishing type load switch according to the present embodiment has three load switches 1 inside the enclosure 200. ) Side by side.

The enclosure 200 is partitioned into an upper drawing space 210a and a lower drawing space 210b by the horizontal plate 210. A door 230 for opening the withdrawal space 210b is installed at the front of the enclosure 200.

The first rotary shaft 3 and the upper case 11 of the load switch 1 for driving the movable terminal 30 are installed in the inlet space 210a, and the load switch unit 210 in the lower withdrawal space 210b. The lead bus bar 88, the ground fixing terminal 99, and the ground movable terminal 120 of 1) are installed.

In addition, a driving unit 300 for rotating the first and second rotation shafts 3 and 5 is installed on the front surface of the enclosure 200. The first rotary shaft 3 is installed horizontally in the inlet space 210a to rotate the rotation rods 40 of the three load switch 1. The second rotary shaft 5 rotates the ground rotary shaft 110 installed horizontally in the lead-out space 210b.

The first rotary shaft 3 moves the movable terminal 30 to connect or separate the fixed terminal 20 to open and close the converter, and the second rotary shaft 5 rotates the ground movable terminal 120 to fix the ground terminal. Connect or disconnect with (99) to remove residual current.

Hereinafter, the structures of the inlet space 210a and the outlet space 210b will be described in order. First, three load switch 1 is installed side by side on the horizontal plate 210 in the inlet space (210a). In the horizontal plate 210, the installation hole 211 for installing the load switch 1 is formed in a row. The load switch 1 is installed through the installation hole 211, the upper case 11 of the load switch 1 is located on the horizontal plate 210, the middle case 12 and the lower case 12 is horizontal Located below the diaphragm 210.

The first rotary shaft 3 for driving the movable terminal 30 is installed in the inlet space 210a. The triangular protrusions 15 of the upper case 11 are all installed to face the same direction, and the first rotary shaft 3 penetrates the horizontal through hole 15a at the tip of the triangular protrusion 15. Therefore, the rotation rod 40 of each load switch 1 is integrally coupled to the first rotary shaft (3).

At the upper end of each load switch 1, an inlet bus bar 21 to which an inlet cable is connected is installed. In addition, an upper end of the ground booth bar 15 penetrates the horizontal plate 210 in the inlet space 210a. The horizontal plate 210 is grounded to the ground bus bar 160 through the ground cable 160a. Therefore, the residual current of the horizontal plate 210 can be grounded. The ground cable 160a may also be connected to the housing 10 of the load switch 1.

Subsequently, in the drawing space 210b, the ground fixing terminal 99 installed at the bottom of the drawing booth bar 88 and the power fuse 90 and the drawing booth bar 88 installed perpendicularly to the outside of the lower case 13. Is installed. In addition, a ground rotating shaft 110 and a ground rotating shaft 110 for rotating the ground movable terminal 120 and the ground movable terminal 120 to be in contact with the ground fixing terminal 99 at one side of the lead-out space portion 210b. An Earthing Switch 111 comprising a second rotary shaft 5 for rotating the shaft is installed.

As shown, the outlet bus bar 88 is connected to the vertical bent portion 86 exposed to the outside of the lower case 13 is installed vertically downward, the extraction cable 89 is one side of the outlet bus bar 88 Is connected to. And the lower end of the draw-out bus bar 88 is bent to the top and the ground fixing terminal 99 is installed on the bottom.

The power fuses 90 are installed side by side in an electrically connected state with the drawing booth bar 88. The upper end of the current fuse 88 is provided with a protruding pin 92 that operates in response to an abnormal current, and the upper side of the protruding pin 92 is provided with a link member 94 that operates in response to the protruding pin 92. do. The link member 94 may be rotated by the protruding pin 92 springing up in response to the abnormal current to operate the first rotation shaft 3 and the second rotation shaft 5.

Then, the ground switch 111 connected to the ground fixing terminal 99 to ground the residual current is rotated so as to be in contact with the ground fixing terminal 99 installed at the lower end of the draw-out booth 88. And, it is integrally fixed to the ground rotating shaft 110 and the ground rotating shaft 110 is installed horizontally on the housing 200 to rotate the ground movable terminal 120 in a clockwise or counterclockwise direction It consists of a ground pivot rod 130 of a predetermined length to which the ground movable terminal 120 is fixed at its tip. The ground movable terminal 120 is formed in the form of a bar that can be simultaneously in contact with the three ground fixing terminal (99).

On the other hand, the ground rotating shaft 110 is rotated by the second rotary shaft (5). For example, the ground pivot shaft 110 and the second rotary shaft 5 may be integrally installed on the same axis. However, the present specification shows a case where the ground rotating shaft 110 and the second rotary shaft 5 are not on the same axis. To this end, a power transmission member 150 is further provided between the ground pivot shaft 110 and the second pivot shaft 5 for transmitting rotational force between two spaced apart shafts.

The power transmission member 150 includes an eccentric plate 152 fixed to the second rotation shaft 5, a vertical rod 154 of a predetermined length rotatably installed at one end of the eccentric plate 152, and a vertical rod ( The lower end of the 154 is rotatably connected and consists of a protruding piece 156 which is integrally installed on the ground pivot shaft 110. Therefore, when the second rotary shaft 5 rotates to one side, the vertical bar 154 moves up and down by the rotation of the eccentric plate 152, and the vertical motion of the vertical bar 154 rotates the protruding piece 156. The ground pivot shaft 110 is rotated clockwise or counterclockwise.

When the ground movable terminal 120 is connected to the ground fixing terminal 99, the current remaining in the drawing booth bar 88 and the load switch 1 is removed through the grounding boot bar 160. The ground bus bar 160 is installed perpendicularly to the lead-out space 210b, and the vertical rods 154 and the eccentric plate 152 are connected to each other through the ground cables 160b and 160c.

Subsequently, a driving part 300 for rotating the first and second rotation shafts 3 and 5 is provided on the front surface of the enclosure 200. The driving part 300 is composed of the first driving part 310 and the second driving part 320 again. The first driving unit 310 is provided with a motor (not shown) for rotating the first rotating shaft 3 or an operating mechanism operated by the operating lever 400. The second driving unit 320 is provided with a motor (not shown) for rotating the second rotary shaft 5 or an operating mechanism operated by the operating lever 400.

In the present specification, an operating mechanism operated by the operating lever 400 will be described. As shown in FIG. 8, the first driving part 310 and the second driving part 320 are provided with covers 311 and 321 formed by bending a metal plate, and the covers 311 and 321 have a first rotating shaft 3. And through holes 3a and 5a through which the second rotary shaft 5 penetrates, respectively. In addition, a coil spring 330 is provided inside the cover 311 of the first driving unit 310 to impart an elastic restoring force to the first rotation shaft 3. One end of the coil spring 330 is integrally coupled to the first rotation shaft 3 and the other end is fixed between the cover 311 and the housing 200.

Therefore, when the first rotary shaft 3 is rotated using the operation lever 400, that is, when the first rotary shaft 3 is rotated to one side to lower the movable terminal 30 to open the converter, the coil spring ( The elastic restoring force of 330 acts on the first rotary shaft 3 to strongly and rapidly rotate the first rotary shaft 3. Accordingly, as the rotation rod 40 connected to the first rotation shaft 3 rotates rapidly, the air inside the puffer chamber 54 is strongly compressed. As such, the coil spring 330 provides an elastic force for compressing and injecting air in the puffer chamber 54. The operation of the coil spring 330 will be described later.

Referring to FIG. 9, the first driving part 310 is horizontally installed through the front end of the first rotation shaft 3. The first rotary shaft 3 is provided with a U-shaped connecting rod 361 for interlocking the upper rotary plate 360 installed on the rear surface of the interlock cover 510. In addition, the rotation guide piece 372 inserted into the arc-shaped guide hole 371 formed on the cover 311 of the first driving unit 310 is integrally installed on the first rotation shaft 3.

In addition, the front end of the second rotary shaft 5 penetrates horizontally to the second driving unit 320. The second rotary shaft 5 is provided with a U-shaped connecting rod 381 for interlocking the lower rotary plate 380 installed on the rear surface of the interlock cover 510. In addition, the first rotation shaft 3 is integrally provided with a rotation guide piece 392 inserted into the arc-shaped guide hole 391 formed in the cover 311 of the first driving unit 310.

Subsequently, an interlock or an interlock device for interlocking the opening of the door 230 and the rotation of the first rotating shaft 3 and the second rotating shaft 5 on the front surface of the driving unit 300 to prevent an electric shock to an operator ( 500 is provided.

The interlock device 500 includes an interlock cover 510 installed perpendicularly to the front surfaces of the first driving unit 310 and the second driving unit 320. The interlock cover 510 is formed by bending a metal plate, and first and second through holes 3b and 5b are formed at predetermined intervals to insert the operation lever 400. The first through hole 3b corresponds to the first rotary shaft 3 and the second through hole 5b corresponds to the second rotary shaft 5.

The interlock device 500 is installed on the front surface of the interlock cover 510 and lock plate 530 that slides up and down between the first through hole 3b and the second through hole 5b, and the first through hole 3b. ) And the first locking module 550 and the second locking module 560 rotatably installed on the rear surface of the interlock cover 510 to correspond to the second through hole 5b and the first locking module 550. And a first locking rod 620 installed vertically between the second locking modules 560 and interlocking with the locking plate 530, and a locking hole 240 of the second locking module 560 and the door 230. 6) is installed between the second locking rod 640 is moved up and down.

The first through hole 3b and the second through hole 5b are sized to allow the cylindrical portion 410 of the operation lever 400 to be inserted therein. In addition, a groove corresponding to the protrusion 420 formed in the cylindrical portion 410 of the operating lever 400 is formed in the first through hole 3b and the second through hole 5b. Therefore, when the cylindrical portion 410 of the operating lever 400 is inserted into the first through hole 3b and the second through hole 5b and turned, the action of the first locking module 550 and the second locking module 560 is controlled. By this, the first rotation shaft 3 and the second rotation shaft 5 can be rotated.

The locking plate 530 is installed on the front surface of the interlock cover 510 to close the first through hole 3b or the second through hole 5b or to close the first through hole 3b and the second through hole 5b. Closing all of them prevents the door 230 from opening before the first rotation shaft 3 and the second rotation shaft 5 are rotated or the ground switch 111 is operated.

The locking plate 530 is a rectangular metal plate and has a length at which an upper end and a lower end thereof can block any one of the first through hole 3b and the second through hole 5b. For example, when the locking plate 530 is moved upward by using the handle 532 formed on the locking plate 530, the first through hole 3b is closed to prevent the operation lever 400 from being inserted. The through hole 5b is opened to insert the operation lever 400.

Therefore, the locking plate 530 allows the first rotary shaft 3 and the second rotary shaft 5 to be sequentially operated. In addition, the lock plate 530 is located in the middle between the first through hole 3b and the second through hole 5b, and the lock ring 533 is provided in the lock plate 530 and the interlock cover 510. If the key ring is fitted to match, the first rotation shaft 3 and the second rotation shaft 5 performs a locking function that cannot rotate.

On the other hand, the interlock cover 510 and the locking plate 530 are formed with a plurality of see-through holes 534. The see-through hole 534 shows the current state of the first rotary shaft 3 and the second rotary shaft 5. For example, the rotation position of the 1st rotation shaft 3 and the 2nd rotation shaft 5 is displayed using a symbol. To this end, the rear plate of the interlock cover 510 is rotatably installed around the first locking module 550 and the second locking module 560, the rotating plate 360, 380 (Fig. 9) is marked with a plurality of symbols.

The first locking module 550 and the second locking module 562, the first operating shaft (3) and the second operating lever 400 inserted through the first through hole (3b) and the second through hole (5b). In addition to connecting to the front end of the rotary shaft (5) serves to interlock the movement of the first locking rod 620 and the second locking rod 640 which is installed on the rear of the interlock cover 510.

To this end, the first locking module 550 is installed to be located on the central axis of the first through hole (3b) and the first rotary shaft (3). The first locking module 550 is an outer cylinder 552 rotatably installed on the rear of the interlock cover 510 so that the cylindrical portion 410 of the operating lever 400 is inserted and rotatable together according to the rotation of the operating lever 400. And, the inside of the outer cylinder 552 is slidably installed back and forth and the front end is closed to install the spring 553 therein, the rear end is open to insert the first rotary shaft (3), but the first rotary shaft ( It consists of an inner cylinder 556 formed with an elastic protrusion 555 screwed to the screw thread 554 formed on the outer peripheral surface of 3).

In addition, at least one locking hole 557a into which the upper end of the first locking rod 620 is inserted is formed in the outer cylinder 552. In addition, two locking holes 557a and 557b may be formed to be spaced apart by a predetermined rotation angle as necessary. An inner circumferential surface of the outer cylinder 550 and an outer circumferential surface of the inner cylinder 556 may be formed with guide protrusions and guide holes to prevent the inner cylinder 556 and the outer cylinder 556 from overhanging.

Therefore, when the cylindrical portion 410 of the operating lever 400 is inserted into the first through hole 3b, the cylindrical portion 410 of the operating lever 400 presses the inner cylinder 556 toward the housing 200 inward. Move it. Subsequently, when the operating lever 400 is turned to one side, the outer cylinder 550 rotates together with the inner cylinder 556. At this time, the elastic protrusion 555 formed at the tip of the inner cylinder 556 is screwed to the screw thread 554 formed on the first rotary shaft 3 to fix the inner cylinder 556 to the tip of the first rotary shaft (3).

When the inner cylinder 556 moves toward the enclosure 200 and is fixed to the front end of the first rotation shaft 3, the spring 553 embedded in the inner cylinder 556 is compressed to have elastic restoring force, and the inner cylinder 552 is A space 559 into which the first locking rod 620 can be inserted is secured. On the contrary, when the inner cylinder 556 moves toward the front end of the outer cylinder 552, the locking holes 557a and 557b are closed by the inner cylinder 556, so that the first locking rod 620 may not be inserted.

Similarly, the second locking module 560 is also installed on the central axis of the second through hole (5b) and the second rotary shaft (5). The second locking module 560 is installed so as to be slidable back and forth within the outer cylinder 562 and the outer cylinder 562 installed in the rear of the interlock cover 510 to rotate in accordance with the rotation of the operating lever 400. Is closed and a spring 563 is installed therein, and the rear end is opened to allow the second rotary shaft 5 to be inserted therein, and an elastic protrusion 565 screwed to the thread 564 formed on the outer circumferential surface of the second rotary shaft 5. It consists of an inner cylinder 566 formed.

The outer cylinder 562 has at least one locking hole 567b into which the lower end of the first locking rod 620 is inserted, and at least two locking holes 567b and 567c into which the upper end of the second locking rod 640 is inserted. ) Is formed. Preferably, the three locking holes 567a, 567b, and 567c are spaced apart at a predetermined rotation angle.

Accordingly, when the operation lever 400 inserted into the outer cylinder 566 is rotated in a direction opposite to the rotation direction of the first locking module 550 described above, the elastic protrusion 565 of the inner cylinder 566 may have a second rotation shaft ( It is released from the thread 564 formed in 5). Then, when the operation lever 400 is removed from the second through hole 5b, the inner cylinder 566 on the housing 200 side is moved toward the front end of the outer cylinder 566 by the restoring force of the spring 563. Then, the inner cylinder 566 is moved to the inner space 569 of the outer cylinder 562 to close the locking holes 567a, 567b and 567c into which the first locking rod 620 and the second locking rod 640 are inserted. Done. Therefore, it is not possible to move the first locking rod 620 to the bottom or to move the second locking rod 640 to the top.

As described above, the interlock device 500 of the present invention includes the first locking rod 620 and the rotation position of the first locking module 550 and the second locking module 560 and the positions of the inner cylinders 556 and 566. Since the movement of the second locking rod 640 may be restricted, the opening and closing of the first and second rotation shafts 3 and 5 and the door 230 may be linked.

For example, the locking holes 557a and 557b may be rotated so that the upper end of the first locking rod 620 may be inserted into the space 559 of the first locking module 550 by rotating the first locking module 550. After opening, when the first locking rod 620 is moved upward, the second locking module 560 may be operated. However, when the first locking module 550 is rotated to the opposite side and the locking holes 557a and 557b are closed by the inner cylinder 556, the first locking rod 620 cannot be moved upward, so the second locking module ( 560) cannot be operated. That is, the first lock module 550 may be operated to cut off the converter before the second lock module 560 may be operated to connect the ground switch.

Likewise, after the locking holes 657b and 657c are opened to rotate the second locking module 550 so that the upper end of the second locking rod 640 can be inserted into the space 659 of the second locking module 650. The door 230 may be opened by moving the second locking rod 640 upward. That is, the current may be removed by operating the second locking module 550, and then the door 230 may be opened by raising the second locking rod 640.

On the other hand, the first locking rod 620 is installed to be able to slide up and down through the two through-bracket 621 installed on the rear of the interlock cover 510. Preferably, the first locking rod 620 is connected to the locking plate 530 to interlock. Therefore, the first locking rod 620 may be moved up and down using the handle 532 formed on the locking plate 530. The length of the first locking rod 620 is longer than the length between the bottom of the first locking module 550 and the top of the second locking module 560.

The second locking rod 640 is also slidably installed vertically through the through bracket 641 installed at the rear of the interlock cover 510. When the lever 643 is used, the second locking rod 640 can be moved up and down. The length of the second locking rod 640 is longer than the length between the lower end of the second locking module 560 and the locking hole 240 formed at the upper end of the door 230.

The bottom of the interlock cover 510 is provided with an elastic stopper 580 to elastically support the second locking rod 640. The elastic stopper 580 elastically supports the dolphin 645 horizontally installed on the second locking rod 640 to prevent the second locking rod 640 from being arbitrarily lowered by gravity. That is, the elastic stopper 580 is composed of a rotating rod 581 supporting the dolphin 645 and a spring pressing the rotating rod 581 in one direction.

As described above, the interlock device 500 may rotate the first rotation shaft 3 to block the converter, and then rotate the second rotation shaft 5, and rotate the second rotation shaft 5 to remove the residual current. Since 230 can be opened, the worker can be prevented from being in an accident.

Next, the structure and operation of the compression spring 330 will be described with reference to FIGS. 8 and 10.

As shown, the first driving unit 310 is provided with a compression spring 330 for imparting an elastic force to the first rotation shaft (3). One side of the compression spring 330 is provided with a connecting rod 332 through which the coupling hole 331 is integrally coupled to the first rotation shaft 3, and the cover 311 of the first driving unit 310 is provided on the other side. ) And a connecting rod 334 having a fixing pin 333 fixed through the rivet hole 333a formed in the enclosure 200 is installed.

As shown in FIG. 10, when the compression spring 330 is horizontal by rotating the first rotary shaft 3, the compression spring 330 is compressed to have elastic restoring force (a). Subsequently, when the compression spring 330 is inclined at a predetermined angle by rotating the first rotation shaft 3 in the opposite direction (b), the support force for supporting the compression spring 330 is lost, and the compression spring 330 rapidly expands. An elastic restoring force acts as a rotation moment on the first rotation shaft 3 to quickly and strongly rotate the first rotation shaft 3 (c).

Therefore, when the direction in which the puffer cylinder 50 moves downward and the rotation direction in which the compression spring 330 expands coincide with each other, when the first rotation shaft 3 is rotated using the operation lever 400, the first hand may be rotated. Only by rotating the rotary shaft 3 above a certain angle, the compression spring 330 expands rapidly and the first rotary shaft 3 rotates rapidly by the elastic restoring force, thereby compressing the air inside the puffer chamber 54. Will be.

As described above, the high-pressure switchgear equipped with a compressed air extinguishing type load breaker according to the present invention partitions the inlet space and the outlet space by using a horizontal plate, the drive unit and the ground switch to open and close the fixed terminal and the movable terminal By interlocking with each other, it facilitates the installation of the load breaker and prevents an electric shock accident. In addition, the present invention is provided with an interlock device for interlocking the opening of the first rotating shaft, the second rotating shaft and the door to prevent the operator from being subjected to an electric shock accident.

1 is a partial cross-sectional view showing a load switch of the conventional puffer extinguishing method;

2 is a partial cross-sectional view showing a compressed air extinguishing type load switch according to the present invention;

Figure 3 is an overall cross-sectional view showing both the withdrawal booth bar and the power fuse installed in the compressed air extinguishing type load switch according to the present invention,

4 and 5 are partially enlarged cross-sectional views of FIG.

6 is a schematic perspective view of a high-voltage switchgear equipped with a load switch of the present invention;

FIG. 7 is a perspective view illustrating a state in which a driving unit installed in the high voltage switchgear of FIG. 6 is removed;

FIG. 8 is a schematic exploded perspective view showing the driving unit shown in FIG. 6;

9 is a cross-sectional view showing a driving unit shown in FIG.

10 is an explanatory view showing the structure and operation of the compression spring.

***** Description of the symbols for the main parts of the drawings *****

1: Load switch 3: 1st rotating shaft

5: second rotating shaft 10: housing

11: upper case 12: middle case

13: lower case 19: see-through

20: fixed terminal 28: gas outlet

30: movable terminal 40: rotating rod

42: rod portion 43: cylindrical rod portion

50: puffer cylinder 51: metal barrel

52: piston 53: fixed rod

54: puffer chamber 60: insulated nozzle

61 nozzle hole 64 compressed air passage

71: conductive ring 73: annular conductive plate

80: slide terminal 86: vertical bending portion

88: drawout booth bar 90: power fuse

Claims (13)

A housing having a fixed terminal formed at an upper end thereof and freely flowing outside air; A per cylinder having a movable terminal corresponding to the fixed terminal and formed of a cylindrical metal cylinder; A rotatable rod rotatably installed on the puffer cylinder to move the movable terminal up and down; A first rotating shaft for rotating the rotating rod; A fixed piston installed inside the percylinder to compress the air in the percylinder when the percylinder moves downward; A slide terminal slidably connected to an outer circumferential surface of the puffer cylinder; The compressed air extinguishing type load switch of claim 1, further comprising a drawing booth bar connected to the slide terminal. The method of claim 1, The housing is composed of an upper case fixed to the fixed terminal, an intermediate case coupled to the lower end of the upper case to accommodate the rotation rod, and a lower case coupled to the lower end of the intermediate case and the periphery cylinder moves up and down Housed compressed air extinguishing load switch. The method according to claim 1 or 2, The rotating rod is composed of a rod portion having a predetermined length connected to the puffer cylinder to be stretchable in the longitudinal direction, and a cylindrical rod portion integrally coupled to the first rotating shaft through a coupling groove so as to rotate together with the first rotating shaft. Housed compressed air extinguishing load switch. The method of claim 1, And a nozzle hole into which a fixed terminal is inserted at an upper end of the puffer cylinder, and an insulating nozzle having a movable terminal installed therein to be in contact with the fixed terminal in the center thereof. The method of claim 4, wherein And said movable terminal is electrically connected to a metal cylinder of a puffer cylinder. The method of claim 5, And a compressed air passage for guiding the compressed air from the puffer chamber to the front end of the movable terminal in the insulating nozzle. The method according to claim 1 or 5, The slide terminal is provided with an annular metal plate having a hole through which the peri cylinder penetrates, an elastic contact portion formed on the bottom of the annular metal plate and composed of a plurality of metal pieces and a spring band, and a pullout bar is integrally formed on one side of the annular metal plate. Housed compressed air extinguishing type load switch characterized in that the vertical bent portion. The method according to claim 1 or 5, The fixed piston is a housing of compressed air extinguishing type load switch, characterized in that consisting of a piston slidably installed in the metal cylinder of the puffer cylinder, and a fixed rod for fixing the piston. The method of claim 1, An annular conductive plate is formed on the lower portion of the periphery cylinder with a conductive ring coated with an insulating material so as to surround the outer side of the periphery cylinder, and a through hole through which the periphery penetrates the conductive ring to be electrically connected to the slide terminal. Housed compressed air extinguishing type load switch characterized in that the eddy current removal device is further installed. The method of claim 2, Compressed air extinguishing type load switch is characterized in that the cylindrical portion of the lower case is further formed with a through hole for observing the current position of the percussion cylinder moving up and down. The method of claim 2, The outlet boot bar further includes a power fuse electrically connected to the outlet bus bar, and one side of the lower case further includes a link member operated by a protrusion pin installed at an upper end of the power fuse. Lo load switch. The method according to claim 1 or 10, The compressed air extinguishing type load switch of the housing, characterized in that the ground fixing terminal is further installed at the lower end of the withdrawal bus bar. The method of claim 1, The compressed air extinguishing type load switch of the housing, characterized in that the gas outlet for discharging the hot gas is formed on the upper end of the housing.

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