KR102505794B1 - Arc clearing switchboard - Google Patents

Abstract

The present invention provides a switchgear clearing an arc equipped with an arc protection system including an arc eliminator, an arc relay, a power breaker, and an arc detection sensor, wherein the arc eliminator includes: an enclosure-shaped protective case with an open portion connected to an n-phase busbar; a main body housing installed within the protective case and forming a movable space therein; a plurality of phase terminals which are installed on the main body housing to be exposed to the inside of the movable space and through which n-phase current is connected to the n-phase busbar for each phase; a plurality of connection terminals electrically connected to the plurality of phase terminals exposed to the movable space, respectively; a movable housing in which the plurality of connection terminals are installed and which slide-moves the plurality of connection terminals to an input position in which the connection terminals are connected to the plurality of phase terminals and an open position in which the connection terminals are separated from the plurality of phase terminals in the movable space; a guide shaft coupled to the movable housing to protrude from the side of the protective case and the main housing, and appearing and disappearing from the main housing as the movable housing slide-moves; an input driving unit that forcibly moves the movable housing to the input position when an arc occurs to connect the connection terminal to the phase terminal; and a buffer tube coupled to the side opposite to the guide shaft appearing and disappearing portion of the main housing to close the movable space so that the air in the movable space is compressed when the movable housing is moved to the input position. The damage to electrically connected parts due to an arc can be prevented.

Description

Arc clearing switchboard {Arc clearing switchboard}

The present invention relates to an arc relieving switchboard capable of preventing damage to electrically connected instruments due to arcs generated in the switchboard.

The switchgear is a device that steps down the high-voltage power supplied from the substation to commercial voltage and distributes it to consumers.

Specifically, the switchgear includes a power receiving end receiving high-voltage power supplied from a substation, a transformer that transforms the high-voltage power received from the substation into a commercial voltage, a power distribution end supplying the transformed electricity to electrical devices of customers such as buildings, and multiple switching devices. devices or other safety features;

In these switchboards, numerous wires and parts such as switches, circuit breakers, and relays are concentrated, and accidents that lead to deterioration, deterioration, and even fires occur frequently while their functions are always in operation.

In particular, arc discharge can cause major accidents and lead to fires or explosions. In the case of arc fires, abnormal current flows due to ground faults, excess capacity, contact with other objects, etc. Contacts between cables, wires, or terminal contacts are overheated.

Due to this, the line is cut and blocked at the faulty area by contacting another object, or continuous and repetitive arcs are generated due to partial contact.

As such, since it is not easy to prevent the occurrence of arcs, it is desirable to minimize the occurrence of arcs so that possible arcs can be eliminated. In the case of such arcs, most of these arcs are known to occur at the contact of terminals, and terminals In the case of , since contact and separation inevitably occur frequently, it is necessary to develop a method for removing the arc generated from the terminal.

Republic of Korea Patent Registration No. 10-1033673 (Announced on May 12, 2011)

An object of the present invention is to provide an arc relieving switchboard capable of preventing damage to electrically connected instruments due to arcs generated in the switchboard.

An arc eliminator switchgear according to the present invention for achieving the above object is an arc eliminator switchgear having an arc protection system including an arc eliminator, an arc relay, a power breaker and an arc detection sensor, wherein the arc eliminator comprises n-phase busbars and A protective case in the shape of an enclosure with an open connection area; a body housing installed in the protective case and having a movable space formed therein; a plurality of phase terminals installed in the main body housing to be exposed to the inside of the movable space and connected to the n-phase bus bar for each n-phase current; a plurality of connection terminals electrically connected to the plurality of phase terminals exposed to the movable space; a movable housing in which a plurality of the connection terminals are installed and which slides and moves the plurality of connection terminals in the movable space between an input position connected to the plurality of phase terminals and an open position separated from the plurality of phase terminals; a guide shaft that is coupled to the movable housing, protrudes to the side of the protective case and the body housing, and protrudes from the body housing according to the sliding movement of the movable housing; an input drive unit forcibly moving the movable housing to the input position when an arc is generated to connect the connection terminal to the phase terminal; and a buffer tube coupled to a side surface of the body housing opposite to the protruding and retracting portion of the guide shaft to close the movable space so that air in the movable space is compressed when the input position of the movable housing is moved.

The protective case may be installed by bolting to a support frame or a support plate within the switchgear.

a pneumatic case coupled to the guide shaft protruding from the inner side of the protective case to the side of the body housing; a pneumatic moving plate integrally coupled to an outer circumferential surface of the guide shaft inside the pneumatic case; and a pneumatic hose connected to communicate with the buffer tube and the pneumatic case.

an exhaust pipe having a first solenoid valve and installed on a part opposite to the connection part with the pneumatic hose in the pneumatic case with the pneumatic moving plate as a boundary; and an intake pipe installed at a position adjacent to the exhaust pipe in the pneumatic case opposite the connection portion with the pneumatic hose and having a second solenoid valve and an air pump.

According to the configuration of the present invention described above, it is possible to prevent damage to electrically connected devices due to an arc generated in a switchboard through an arc eliminator.

At the same time, through the configuration of the buffer tube, the air in the movable space is compressed while the air in the movable space is induced according to the sliding movement of the movable housing by the input drive unit, thereby relieving vibration and shock that may occur due to the instantaneous movement of the movable housing. It is possible to prevent damage, breakage, or rupture of the part where the protection case is fastened to the support frame or the support plate in the switchgear.

In addition, when the buffer tube that seals the movable space expands according to the movement of the movable housing and achieves a buffer, the air in the buffer tube is exhausted to some extent into the pneumatic case through the pneumatic hose, and the pneumatic moving plate integrally formed with the guide shaft By maintaining the state of being pushed toward the main housing, it is possible to prevent the connection terminal from being easily separated from the phase terminal due to earthquake or vibration by firmly supporting the state in which the movable housing has moved to the insertion position.

As this maintains the airtightness without inflow of air into the movable space, the effect of suppressing the risk of fire that may occur due to a short circuit between the phase terminal and the connection terminal can be expected.

Furthermore, when it is desired to return the movable housing from the input position to the first open position, the first solenoid valve is actuated to fill the air in the opposite part of the pneumatic case through the pneumatic hose with the pneumatic moving plate as the boundary. After taking it out to the exhaust pipe, by operating the second solenoid valve and injecting air back into the area where the air came out through the air pump, pressurize the pneumatic moving plate to move it back to its original position, and induce the guide shaft to also move to its original position. Accordingly, it is possible to eliminate the inconvenience caused by the manual work of a separate operator to return the movable housing.

1 is a cross-sectional view schematically showing a state in which an arc eliminator is installed in an arc eliminator switchboard according to the present invention.
2 is a perspective view schematically showing an arc eliminator installed in a protective case in an arc relieving switchgear according to the present invention.
3 is a cross-sectional view schematically showing a disassembled arc eliminator in an arc relieving switchgear according to the present invention.
4 is a cross-sectional view schematically showing a state in which a movable housing is disposed in an open position in an arc eliminator of an arc mitigation switchboard according to the present invention.
5 is a cross-sectional view schematically showing a state in which a movable housing is disposed in an input position in an arc eliminator of an arc mitigation switchboard according to the present invention.

Hereinafter, with reference to the accompanying drawings, preferred implementation configurations for realizing the object of the present invention described above and operational relationships according to these configurations will be described, and detailed descriptions of technical configurations in the same or the same category as the prior art will be omitted. do it with

The present invention relates to an arc relieving switchboard capable of preventing damage to electrically connected instruments due to arcs generated in the switchboard.

To this end, the configuration of the arc eliminator switchboard according to the present invention, as shown in FIGS. 1 to 5, has a technical point in the arc eliminator 100 installed in the protective case 10, and the arc eliminator 100 has a main body Including housing 110, phase terminal 120, movable housing 130, connection terminal 140, input driver 150, optical signal receiver 160, buffer tube 170 and pneumatic case 180 It can be done.

As shown in FIG. 1, the switchboard equipped with such an arc eliminator 100 is an arc protection system 300 including an arc relay 200, a power breaker 210, and an arc detection sensor 230 together with the arc eliminator 100. ) can be provided.

As shown in FIGS. 2, 4, and 5, the protective case 10 of the present invention has a box shape with an open rear part connected to the n-phase busbar, and is bolted to the support frame or the support plate 20 in the switchgear. (30) Installation can be accomplished by fastening.

As shown in FIGS. 1 to 5 , the arc eliminator 100 of the present invention can suppress the arc by shorting all phases to generate a low impedance short circuit when an arc is generated due to a short circuit or a ground fault inside the switchboard.

The arc eliminator 100 quickly suppresses the arc within 4 ms from the occurrence of the arc and operates more quickly than the operation of the power circuit breaker 210, thereby preventing the occurrence of an arc accident.

The arc eliminator 100 may be installed independently together with the arc detection sensor 230, or may be configured together with the arc protection system 300 to prevent an arc accident from occurring.

The arc protection system 300 is controlled by an arc sensor 230 that detects the occurrence of an arc, an arc relay 200 that receives and controls an arc signal from the arc sensor 230, and an arc relay 200 to provide power It may be configured to further include a power breaker 210 to cut off the supply of.

Here, the arc detection sensor 230 may include any one or both of a light detection sensor for detecting light generated from an arc or an overcurrent detection sensor for detecting an overcurrent, and the arc detection sensor 230 is an arc relay It is possible to remove the arc by directly transmitting an arc signal that senses the arc without passing through 200.

The body housing 110 of the present invention, as shown in FIGS. 2 to 5, may be formed in a square or circular column shape, and the column may be disposed in a lying shape, that is, in a horizontally lying shape.

Inside the body housing 110, a movable space 110a in which the movable housing 130 to be described later slides can be formed along the horizontal direction, and one side of the body housing 110 (with reference to FIGS. 3 to 5) The left end) may be open and the other end (right direction based on FIGS. 3 to 5) may be closed.

Here, a connection terminal 140 to be described later may be adhered to and supported on an inner circumferential surface of the body housing 110 constituting the movable space 110a.

A protruding hole 119 in which a guide shaft 135 to be described later protrudes and protrudes may be formed on the other sealed side of the body housing 110 .

For example, the body housing 110 may be configured in the form of assembling a plurality of unit blocks 111, the plurality of unit blocks 111 may be formed of an insulator, and the unit block 111 may be formed of a plurality of unit blocks. In a state in which 111 is coupled, a block hole 112 may be formed through the center to form a movable space 110a communicating with each other inside.

That is, the unit block 111 may form the body housing 110 in the form of assembling the unit blocks 111 in the form of cutting the main body housing 110 vertically into a plurality of pieces.

The body housing 110 is configured in the form of assembling the unit blocks 111, and the unit blocks 111 are replaced according to the magnitude of current supplied to the phase terminals 120 to be described later, and between the phase terminals 120 The spacing can be easily adjusted.

At this time, the unit block 111 may further include one side finishing block 117 and the other side finishing block 118.

One side finishing block 117 can be coupled to one end of the assembled unit block 111 to close one side of the assembled unit blocks 111, and the other side finishing block 118 is a plurality of assembled unit blocks. The other side of the assembled unit blocks 111 may be closed by being coupled to the other end of the (111).

One side closing block 117 may have a shape with a center penetrating so as to communicate with the movable space 110a of the main body housing 110, and the movable housing 130 inserted into the movable space 110a is in the body housing 110. escape can be prevented.

A stepping step may be formed on one side closing block 117 to limit a distance in which the movable housing 130 sliding in the body housing 110 moves in one direction.

The other side finishing block 118 may be formed in the form of a plate, and on one side may be formed a fitting portion inserted into and fitted into the block hole 112 of the unit block 111, and a guide shaft 135 is formed in the central portion. Protruding holes 119 may be formed through.

A plurality of unit blocks 111 are assembled in an overlapping manner, and a plurality of through bolts pass through the corner portions of the unit block 111, one side finishing block 117 and the other side finishing block 118 and are fitted. The number of unit blocks 111 may be combined.

The unit block 111 may include an airtight packing 113, and the airtight packing 113 may be installed on one side or both sides of the unit block 111 to provide airtightness between the unit blocks 111.

The airtight packing 113 may be installed along the circumference of the block hole 112 on both sides of the unit block 111, and foreign substances may enter the movable space 110a in a state in which a plurality of unit blocks 111 are assembled. penetration can be prevented.

For example, the airtight packing 113 may be formed of a material having airtightness such as rubber, silicone, urethane or Teflon. At this time, the unit block 111 has a packing groove for installing the airtight packing 113 on one side or both sides. can be formed

The movable housing 130 may be grounded to the outside by the protective case 10 or the guide shaft 135 covering the ground wire or the arc eliminator 100 .

As shown in FIGS. 2 to 5, the phase terminals 120 of the present invention are connected to n-phase busbars, and a plurality of phase terminals 120 are installed in the body housing 110 so that currents of each phase can be supplied. It can be.

For example, when three-phase electricity is supplied, three phase terminals 120 may be installed in the body housing 110 .

The phase terminal 120 can be positioned so as to be exposed to the inside of the movable space 110a of the body housing 110, and is formed in the form of a plate and is installed between the plurality of unit blocks 111, so that the unit block 111 can be separated by

A terminal hole 121 may be formed through the central portion of the phase terminal 120 to form a movable space 110a passing through the assembled body housing 110, and the terminal hole 121 is a movable space 110a. ) and the corresponding circumference size.

In the phase terminal 120, a bar coupling portion to which a bus bar for supplying current of each phase is coupled may be formed on the outside of the phase terminal 120, and the bar coupling portion is connected to the main body housing 110 in a state in which the main housing 110 is assembled. may be located outside of

A plurality of phase terminals 120 may be installed in the body housing 110 so as to be positioned on the same side of the body housing 110 .

The terminal hole 121 has a plane continuous with the block hole 112, and enters the inner circumference of the terminal hole 121 while guiding the connection terminal 140 to be described later, so that the phase terminal 120 and the connection terminal 140 are electrically can be connected to.

For example, the phase terminal 120 may be formed of aluminum, copper, copper alloy or aluminum alloy, which is a metal through which current may flow.

The connection terminal 140 of the present invention can be electrically connected to the phase terminal 120, as shown in FIGS. 3 to 5, and the connection terminal 140 has a number corresponding to a position corresponding to the phase terminal 120. It may be located inside the furnace movable space (110a).

The plurality of connection terminals 140 are electrically disconnected from the phase terminal 120 in the movable space 110a, for example, the open position located in the block hole 112 of the unit blocks 111 and the connection terminal 140 It can be installed in the movable space 110a so as to slide and move by the movable housing 130 to be described later to an input position located in the terminal hole 121 of the phase terminal 120, which is an electrically connected position.

The connection terminal 140 may be electrically connected to the phase terminal 120 in the form of being inserted into the terminal hole 121 of the phase terminal 120 and connected to the inner circumference of the terminal hole 121, and the connection terminal ( 140 is supported in close contact with the block hole 112 of the movable space 110a, and when moving in the direction where the terminal hole 121 is located, it can be supported by elastic force in the terminal hole 121 while being compressed and compressed.

When each connection terminal 140 is electrically connected to the phase terminal 120, the connection terminals 140 short-circuit the n-phase current together through the movable housing 130, which is a conductor, to generate low impedance, thereby preventing an arc. be able to remove

The connection terminal 140 may be supported by a spring or formed in a shape capable of being elastically deformed so as to be press-fitted by elastic force in a radial direction from the inner circumference of the terminal hole 121 .

For example, the connection terminal 140 may be formed in the form of manufacturing a pipe having a hollow inside in a ring shape so as to have elasticity due to the hollow.

As shown in FIGS. 3 to 5, the movable housing 130 of the present invention is installed so as to be slidably movable inside the movable space 110a, so that the plurality of connection terminals 140 are placed in the input position or at the same time in the movable space 110a. It can slide to the open position.

A plurality of connection terminals 140 may be installed together in the movable housing 130 , and the movable housing 130 may be formed of a metal capable of being electrically conductive with the connection terminals 140 .

The movable housing 130 may be formed in a hollow cylindrical shape similar to a conventional cup, one end may be open and the other end may be sealed, and the connection terminal 140 is fitted around the movable housing 130. It can be installed in a hanging shape.

Here, the sealed portion of the movable housing 130 may be installed in the movable space 110a so as to face the other closed end of the body housing 110 .

A pair of terminal fixing jaws 131 for fixing the connection terminals 140 in the movable housing 130 may be formed protruding from the circumference of the movable housing 130 with the connection terminal 140 spanning the movable housing 130 . At this time, a pair of terminal fixing jaws 131 may be formed in plurality in the movable housing 130 in a number corresponding to the number of connection terminals 140.

Through the sliding movement of the movable housing 130, n-phase electricity is connected to the main body housing 110, and one movable housing 130 moves and short-circuits. cost can be drastically reduced.

The guide shaft 135 of the present invention, as shown in FIGS. 2 to 5, can guide the sliding movement of the movable housing 130 in the body housing 110, and is movable to the closed end of the movable housing 130. The housing 130 is installed to protrude in a sliding direction, and the end of the guide shaft 135 penetrates the protruding hole 119 of the main housing 110 and is exposed to the outside of the main housing 110 and at the same time a protective case. It may protrude to the side of (10).

That is, in the movable housing 130, the guide shaft 135 for guiding the movement of the movable housing 130 is inserted into the protrusion hole 119 of the main housing 110 and fitted, and the guide shaft 135 is the movable housing ( As the sliding movement of the 130, it appears and disappears from the protruding hole 119.

The guide shaft 135 is supported by the protruding hole 119 and can guide the movement of the movable housing 130 when the movable housing 130 slides in the movable space 110a, and the guide shaft 135 is movable. When the movable housing 130 along with the housing 130 slides from the open position to the input position, a part of the protruding hole 119 is inserted into the main body housing 110, and when moving from the input position to the open position It may protrude from the body housing 110 .

The guide shaft 135 not only guides the movement of the movable housing 130 in the body housing 110, but also forcibly moves the movable housing 130 by pulling or pushing the guide shaft 135 protruding outward from the body housing 110. ) may be slid from the open position to the input position, or may be slid from the input position to the open position.

As shown in FIGS. 3 to 5 , the input drive unit 150 of the present invention can forcibly slide the movable housing 130 from the open position to the input position or slide from the open position to the input position.

The input driving unit 150 may have a mechanical structure such as a pneumatic or hydraulic cylinder, gear connection or screw fastening, or an electrical structure by magnetic force such as an electromagnet.

In the present invention, the input driving unit 150 is composed of a Thomson coil having an electrical structure to forcibly move the movable housing 130 by magnetic force.

Here, the Thomson coil generates magnetic force when electricity is supplied, and can slide the movable housing 130 from the body housing 110 by the magnetic force, and since the structure of the Thomson coil is a well-known structure, a detailed description thereof will be omitted. do it with

When the input driving unit 150 is implemented with a Thomson coil, the occurrence of an arc accident can be minimized by sliding and moving the movable housing 130 quickly within several ms rather than using a mechanical structure.

The Thompson coil may be installed inside the movable space 110a, and is located at the sealed other end of the body housing 110 inside the movable space 110a, and when magnetic force is generated according to the input of electricity, the movable housing 130 The movable housing 130 may be slidably moved in the body housing 110 in the form of pushing toward one end of the body housing 110 .

In the present invention, the movable housing 130 is pushed out of the Thomson coil and configured to move to the input position, but on the contrary, it may be configured to move to the input position by pulling the movable housing 130 in the direction where the Thomson coil is located.

The closing driver 150 may include a power supply unit to which power is supplied to operate the closing driver 150, and the power supply unit charges and stores power when the closing driver 150 is implemented as a Thomson coil. Alternatively, it may be implemented as a secondary battery.

As shown in FIG. 3 , the optical signal receiving unit 160 of the present invention may transmit an arc signal detected by the arc sensor 230 as an optical signal to operate the input driving unit 150 .

The optical signal receiver 160 may be directly connected to the arc detection sensor 230 to receive an arc signal, or may operate the closing driver 150 according to an arc signal transmitted through the arc relay 200 .

Here, the optical signal receiving unit 160 receives an arc signal that detects the occurrence of an arc through an optical signal, and quickly operates the input driving unit 150 to relieve the arc, thereby preventing damage to electrical devices electrically connected to each other. It can be prevented.

As shown in FIGS. 3 to 5, the buffer tube 170 of the present invention is coupled to one side of the one side finishing block 117 on the opposite side of the protruding part of the guide shaft 135 of the body housing 110, and one side finishing block ( 117) When the movable housing 130 is moved to the insertion position by closing the movable space 110a by sealing the penetrating portion in the center, air in the movable space 110a may be compressed.

Through the buffer tube 170, the sliding movement of the movable housing 130 by the input drive unit 150 compresses the air in the movable housing 130 as well as the movable space 110a, thereby inducing a buffer action. Damage to the part where the protection case 10 is fastened to the support frame or the support plate 20 (including the bolt 30) within the switchgear by mitigating vibration and shock that may occur due to the instantaneous movement of the movable housing 130 or to prevent damage or breakage.

As shown in FIGS. 3 to 5, the pneumatic case 180 of the present invention is coupled to the guide shaft 135 protruding from the inside of the protective case 10 to the side of the main housing 110 so that the guide shaft 135 penetrates. To achieve a shape, specifically, the guide shaft 135 protruding to the other side of the main body housing 110 through the protruding hole 119 in a shape in which one side surface makes surface contact with the other side surface of the other side finishing block 118 It is installed so as to form a seal by covering the protruding part of the.

Inside the pneumatic case 180, a pneumatic moving plate 181 integrally coupled to the outer circumferential surface of the guide shaft 135 may be provided, and the pneumatic case 180 and the buffer tube 170 are interconnected so that they communicate. It consists of a configuration including a pneumatic hose 182 to achieve.

At this time, the pneumatic moving plate 181 may be made of a size and shape so that the surface forming the circumference can make surface contact with the surface forming the inner circumference of the pneumatic case 180, and the buffer tube ( As air is introduced from 170, it can slide to one side along with the guide shaft 135.

Through the configuration of the pneumatic case 180, when the buffer tube 170 that seals the movable space 110a expands according to the sliding movement of the movable housing 130 and achieves a buffer, the air in the buffer tube 170 is compressed by pneumatic pressure. By making the exhaust into the pneumatic case 180 to some extent through the hose 182 and maintaining the state of pushing the pneumatic moving plate 181 integrally formed with the guide shaft 135 toward the main body housing 110, the movable housing ( 130) is firmly supported in a state in which it has moved to the insertion position, so that the connection terminal 140 can be prevented from being easily separated from the phase terminal 120 due to earthquake or vibration.

This is realized by being able to maintain the airtightness in the movable space 110a without inflow of air, and accordingly, the risk of fire that may occur due to a short circuit between the phase terminal 120 and the connection terminal 140 can be suppressed. The effect can be expected.

On the other hand, the arc eliminator 100 of the arc relieving switchboard according to the present invention, as shown in FIGS. 3 and 4, the part opposite the connection part with the pneumatic hose 182 in the pneumatic case 180 with the pneumatic moving plate 181 as the boundary It may be configured to further include an exhaust pipe 183 installed on (one side of the pneumatic moving plate 181) and having a first solenoid valve 183a.

In addition, it is installed adjacent to the exhaust pipe 183 in the pneumatic case 180 of the opposite side of the connection with the pneumatic hose 182 (one side of the pneumatic moving plate 181), and the second solenoid valve 184a and An intake pipe 184 having an air pump 184b may also be configured to further include.

In addition, when the arc is removed through the arc eliminator 100 of the arc eliminator switchgear according to the present invention and all arc generating elements are resolved, the operator directly guides the guide shaft 135 so that the arc eliminator 100 can be restarted. By pulling outward to return the movable housing 130 located at the input position to the open position, the connection terminal 140 is separated from the phase terminal 120 to release the short circuit. Conventionally, the return lever is on the guide shaft 135 has been combined to return the movable housing 130 to the open position in a form that can return the return lever to a form that operates in the form of a lever.

By the way, through the configuration of the exhaust pipe 183 and the intake pipe 184 of the present invention, when it is desired to return the movable housing 130 from the input position to the first open position, the first solenoid valve 183a is operated to In the pneumatic case 180, the air of the opposite part (one side of the pneumatic moving plate 181) filled with the air introduced through the pneumatic hose 182 across the pneumatic moving plate 181 is discharged to the exhaust pipe 183. After taking it out, the second solenoid valve 184a is operated to re-inject air into the part where the air came out (one side of the pneumatic moving plate 181) through the air pump 184b, so that the pneumatic moving plate 181 By applying pressure and moving it back to the original position (the other part in the pneumatic case 180), the guide shaft 135 is also moved to the original position (the position of the first appearance and retraction), so that the movable housing 130 returns to a separate operator can eliminate the hassle of manual work.

The above embodiment in the present invention is an example, and the present invention is not limited thereto. Anything having substantially the same configuration as the technical concept described in the claims of the present invention and achieving the same operational effect is included in the technical scope of the present invention.

10: protective case 20: support frame or support plate
30: bolt 100: arc eliminator
110: body housing 110a: movable space
111: unit block 112: block ball
113: confidential packing 117: one side closing block
118: other side closing block 119: spawn hole
120: phase terminal 121: terminal hole
130: movable housing 131: terminal fixing jaw
135: guide axis 140: connection terminal
150: input driving unit 160: optical signal receiving unit
170: buffer tube 180: pneumatic case
181: pneumatic moving plate 182: pneumatic hose
183: exhaust pipe 183a: first solenoid valve
184: intake pipe 184a: second solenoid valve
184b: air pump 200: arc relay
210: power breaker 230; arc sensor
300: arc protection system

Claims (4)

An arc relieving switchboard equipped with an arc protection system including an arc eliminator, an arc relay, a power breaker and an arc detection sensor,
The arc eliminator may include a housing-shaped protective case in which an n-phase bus bar and a connection portion are open; a body housing installed in the protective case and having a movable space formed therein; a plurality of phase terminals installed in the main body housing to be exposed to the inside of the movable space and connected to the n-phase bus bar for each n-phase current; a plurality of connection terminals electrically connected to the plurality of phase terminals exposed to the movable space; a movable housing in which a plurality of the connection terminals are installed and which slides and moves the plurality of connection terminals in the movable space between an input position connected to the plurality of phase terminals and an open position separated from the plurality of phase terminals; a guide shaft that is coupled to the movable housing, protrudes to the side of the protective case and the body housing, and protrudes from the body housing according to the sliding movement of the movable housing; an input drive unit forcibly moving the movable housing to the input position when an arc is generated to connect the connection terminal to the phase terminal; And a buffer tube coupled to a side surface of the body housing opposite to the protruding and retracting portion of the guide shaft to close the movable space so that air in the movable space is compressed when the input position of the movable housing is moved.
a pneumatic case coupled to the guide shaft protruding from the inner side of the protective case to the side of the body housing; a pneumatic moving plate integrally coupled to an outer circumferential surface of the guide shaft inside the pneumatic case; And a pneumatic hose forming a connection so that the buffer tube and the pneumatic case communicate with each other;
The pneumatic moving plate has a size and shape in which a surface forming a circumference is in surface contact with a surface forming a circumference inside the pneumatic case,
When the buffer tube that seals the movable space expands according to the sliding movement of the movable housing to form a buffer, the air in the buffer tube is exhausted into the pneumatic case through the pneumatic hose, and the guide shaft and integrally configured An arc relieving switchboard, characterized in that maintaining a state in which the pneumatic moving plate is pushed toward the body housing. According to claim 1,
The arc relieving switchboard, characterized in that the protective case is installed by bolting to a support frame or a support plate in the switchboard. delete According to claim 1,
an exhaust pipe having a first solenoid valve and installed on a part opposite to the connection part with the pneumatic hose in the pneumatic case with the pneumatic moving plate as a boundary; and
The arc relieving switchboard further comprises an intake pipe installed at a position adjacent to the exhaust pipe in the pneumatic case opposite the connection portion with the pneumatic hose and having a second solenoid valve and an air pump.

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