Duct facility capable of ensuring safety of workers

Abstract

The ductwork includes a ventilation duct, an arc duct, and a switching device. The ventilation duct is provided on the outside of the equipment room where the electrical equipment is installed and connects to the inside of the equipment room through a first ventilation port and a second ventilation port facing each other. The arc duct is provided in the equipment room to connect the space between the first ventilation port and the second ventilation port with the inside of the electrical equipment. The switching device controls the opening and closing of the arc duct and includes a separator plate and a fixing plate. The separator plate is installed in the arc duct to enable switching between a first position, in which the first ventilation port is opened and the arc duct is closed, and a second position, in which the arc duct is opened and the first ventilation port is closed. The fixing plate is located above the first ventilation port and fixes the separator plate in the second position.

Description

Technology Field

[0001] The present invention relates to a duct system, and more specifically, to a duct system that combines ventilation and arc exhaust functions. Background Technology

[0002] An Underground-Compact Distribution Station (U-CDS) is a power supply facility that combines a transformer, a multi-circuit breaker, and a low-voltage distribution board in a manhole-type underground structure. A multi-circuit breaker is a type of branched multi-circuit breaker composed of two or more load switches and one or more transformer protection devices for ring-shaped power system design.

[0003] Since underground distribution stations are installed in underground spaces, various technologies capable of controlling flooding, condensation, and overheating must be applied. In particular, ventilation functions to prevent equipment overheating and insulation oil degradation due to high loads, as well as safety functions for pedestrians and workers, can be considered basic performance requirements that underground distribution stations must ensure.

[0004] During the operation of an underground distribution station, an arc may occur due to a three-phase short circuit at the connection point of a multi-circuit breaker. To protect workers, the arc must not come into contact with them, and any smoke generated after the arc is extinguished must be quickly and promptly vented to the outside. Prior art literature

[0005] Korean Patent Publication No. 2021-0026583 'Ventilation System for Switchboard' The problem to be solved

[0006] The aim is to provide a duct system that simplifies the overall configuration by unifying the ventilation duct and the arc exhaust duct, and ensures worker safety in the event of an arc. Additionally, the invention aims to provide a distribution station equipped with such a duct system and a method for operating the duct system. means of solving the problem

[0007] A duct system according to one embodiment of the present invention includes a ventilation duct, an arc duct, and an opening and closing device. The ventilation duct is provided on the outside of an equipment room where an electrical device is installed and communicates with the inside of the equipment room through a first ventilation port and a second ventilation port facing each other. An arc duct is provided in the equipment room to connect the space between the first ventilation port and the second ventilation port with the inside of the electrical device. The opening and closing device controls the opening and closing of the arc duct and includes a separating plate and a fixing plate. The separating plate is installed in the arc duct to enable mutual switching between a first position in which the first ventilation port is opened and the arc duct is closed, and a second position in which the arc duct is opened and the first ventilation port is closed. The fixing plate is located above the first ventilation port and fixes the separating plate in the second position.

[0008] The first ventilation opening may be located closer to the inner side of the equipment room than the second ventilation opening, and the arc duct may be located between the electrical device and the inner wall of the equipment room. An underground space may be located beneath the floor of the equipment room, and the interior of the electrical device and the interior of the arc duct may be connected to each other through the underground space.

[0009] The separator plate can be rotatably installed at one corner below the first ventilation opening of the upper part of the arc duct by means of a first rotation axis coupled with a first elastic member, and can be rotated by arc pressure when an arc occurs to switch to a second position.

[0010] The fixed plate can be connected and installed on the ceiling of the equipment room and can be provided to be rotatable by a second rotation axis coupled with a second elastic member. A vertical plate can be fixedly installed on the ceiling of the equipment room, the second rotation axis can be rotatably coupled to the bottom of the vertical plate, and the fixed plate can be positioned parallel to the vertical direction.

[0011] The separator plate can rotate by arc pressure and strike the fixed plate, and the fixed plate can return to its initial position after rotation by the strike, and when the separator plate attempts to return to its initial position, the fixed plate can resist the restoring force of the separator plate to fix the separator plate in a second position.

[0012] A first inclined surface may be provided at the end of the separator plate furthest from the first rotation axis, and a second inclined surface may be provided at the end of the fixed plate furthest from the second rotation axis. When the separator plate is in the second position, the first inclined surface and the second inclined surface may be in close contact with each other. The first inclined surface may be provided to face the interior of the arc duct when the separator plate is in the first position, and the second inclined surface may be provided to face the interior of the equipment room when the fixed plate is in a vertical state.

[0013] A duct system according to another embodiment of the present invention comprises a ventilation duct, an arc duct, a separator plate, a fixed plate, and a rotation angle limiting member. The ventilation duct is provided on the outside of an equipment room where an electrical device is installed and communicates with the inside of the equipment room through a first ventilation port and a second ventilation port facing each other. The arc duct is provided in the equipment room to connect the space between the first ventilation port and the second ventilation port with the inside of the electrical device. The separator plate is rotatably installed on the top of the arc duct by a first rotation axis coupled with a first elastic member and operates to open the arc duct and close the first ventilation port by rotating due to arc pressure when an arc occurs. The fixed plate is rotatably installed on the upper side of the first ventilation port by a second rotation axis coupled with a second elastic member and contacts the separator plate rotated by arc pressure. The rotation angle limiting member is provided at the end of the separator plate and the end of the fixed plate, respectively, and resists the restoring force of the separator plate rotated by arc pressure to maintain the closure of the first ventilation port by the separator plate.

[0014] The first ventilation port may be located closer to the interior of the equipment room than the second ventilation port, and the first rotation axis may be installed below the first ventilation port at the top of the arc duct. The first rotation axis and the second rotation axis may be parallel to each other, and the separator plate may be provided with a size that covers the top of the arc duct, and the width of the fixing plate may be smaller than the width of the separator plate.

[0015] The separator plate can normally close the top of the arc duct and open the first ventilation port, and upon an arc explosion, it can rotate to strike the fixed plate and pass over it, and the fixed plate can return to its initial position after rotating due to the strike. The rotation angle limiting part may include a first inclined surface formed at the end of the separator plate and a second inclined surface formed at the end of the fixed plate. When the separator plate, having rotated past the fixed plate, attempts to return to its initial position, the first inclined surface and the second inclined surface may come into close contact with each other to limit the rotation of the separator plate.

[0016] A power distribution station according to one embodiment of the present invention includes a duct facility of the configuration described above, a facility room equipped with the duct facility, and an electrical device installed in the facility room.

[0017] The equipment room may be a manhole-type underground structure, and the electrical device may be a branch-type multi-circuit breaker including two or more load switches and one or more transformer protection devices.

[0018] A method of operating a duct system according to one embodiment of the present invention includes a ventilation operation step, an arc duct opening step, and an arc discharge step. In the ventilation operation step, the separator plate maintains a first position, and normal ventilation of the equipment room is achieved through the ventilation duct. In the arc duct opening step, when an arc occurs in an electrical device, the separator plate rotates due to the explosion pressure and switches to a second position. In the arc discharge step, the separator plate maintains the second position by a fixed plate, and the arc is discharged through the arc duct and the ventilation duct.

[0019] The separator plate can be connected to a first rotation axis coupled with a first elastic member, and the fixed plate can be connected to a second rotation axis coupled with a second elastic member; in the arc duct opening stage, the separator plate can rotate by the explosion pressure to strike the fixed plate and pass over the fixed plate, and the fixed plate can return to its initial position after rotating by the strike.

[0020] When the separator plate attempts to return to its initial position after the fixed plate has returned to its initial position, the fixed plate can resist the restoring force of the separator plate to fix the separator plate in a second position. A first inclined surface may be provided at the end of the separator plate, and a second inclined surface may be provided at the end of the fixed plate, and during the arc discharge stage, the first inclined surface and the second inclined surface may be in close contact with each other to restrict the rotation of the separator plate.

[0021] A method of operating a duct facility according to one embodiment of the present invention may further include a separator return step, in which, after an arc discharge step, the facility room is repaired and the separator returns to a first position to open a first ventilation opening. Effects of the invention

[0022] The duct system according to the present embodiment utilizes the ventilation duct, which is basically installed in the equipment room, for arc exhaust, thereby eliminating the need to install a separate arc duct outside the equipment room. This simplifies the overall configuration and reduces the manufacturing cost of the equipment room. Additionally, the first ventilation opening closes automatically when an arc occurs, effectively preventing safety accidents such as worker injury and suffocation. Furthermore, since the opening and closing device operates by arc pressure without a separate power source, maintenance is simple and the likelihood of failure is low. Brief explanation of the drawing

[0023] FIG. 1 is a schematic diagram of a power distribution station equipped with duct facilities according to one embodiment of the present invention. Figure 2 is a cross-sectional view of the power distribution station illustrated in Figure 1. Figure 3 is an enlarged view of the duct equipment among the power distribution stations shown in Figure 2. Figure 4 is a partial enlarged perspective view of the separator plate among the duct equipment illustrated in Figure 3. Figure 5 is a schematic diagram of a power distribution station illustrating the normal ventilation operation state. Figure 6 is a schematic diagram of a power distribution station illustrating the arc generation state. Figures 7 to 9 and Figure 11 are diagrams showing the operation process of a separator plate by an arc explosion. Figure 10 is a schematic diagram of a power distribution station illustrating the arc discharge state. FIG. 12 is a flowchart showing the operation process of a duct system according to one embodiment of the present invention. Specific details for implementing the invention

[0024] The technical terms used herein are for the reference of specific embodiments only and are not intended to limit the invention. The singular forms used herein include plural forms unless phrases clearly indicate otherwise. The meaning of "comprising" as used in the specification specifies a particular characteristic, area, integer, step, action, element, and / or component, and does not exclude the presence or addition of other particular characteristic, area, integer, step, action, element, component, and / or group.

[0025] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as generally understood by those skilled in the art to which this invention pertains. Terms defined in commonly used dictionaries are further interpreted to have meanings consistent with relevant technical literature and the present disclosure, and are not interpreted in an ideal or highly formal sense unless otherwise defined.

[0026] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0027] FIG. 1 is a schematic diagram of a power distribution station equipped with duct facilities according to one embodiment of the present invention, and FIG. 2 is a cross-sectional view of the power distribution station shown in FIG. 1.

[0028] Referring to FIGS. 1 and 2, a duct facility (100) of one embodiment is provided for ventilation and arc exhaust in a facility room (200) in which an electrical device (300) is installed. The facility room (200) may be a manhole-type underground structure and is combined with the electrical device (300) to form a power distribution station.

[0029] The electrical device (300) may be any one of a transformer, a multi-circuit breaker, and a low-voltage distribution board, and in particular may be a multi-circuit breaker. The multi-circuit breaker (Ring Main Unit) may be configured as a type of branched multi-circuit breaker consisting of two or more load break switches and one or more transformer protection units for the design of a ring-shaped power system.

[0030] The distribution station may be an Underground-Compact Distribution Station (U-CDS), which is a power supply facility combining a transformer, multi-circuit breaker, and low-voltage distribution panel in an underground structure, but is not limited to such examples.

[0031] A duct facility (100) of one embodiment includes a ventilation duct (10) for ventilation, an arc duct (20) for arc discharge, and an opening / closing device (30) for controlling the opening and closing of the arc duct (20). The opening / closing device (30) normally closes the arc duct (20) so that the ventilation duct (10) performs normal ventilation, and when an arc occurs in an electrical device (300), it connects the arc duct (20) and the ventilation duct (10) so that the ventilation duct (10) performs the arc discharge function.

[0032] Specifically, on one side of the equipment room (200), a first ventilation opening (41) and a second ventilation opening (42) are provided facing each other along the horizontal direction, and a ventilation duct (10) may be fixedly installed on the outer wall of the equipment room (200) to communicate with the second ventilation opening (42). The first ventilation opening (41) is located closer to the inside of the equipment room (200) than the second ventilation opening (42).

[0033] In FIGS. 1 and 2, a portion of the lower side of the ventilation duct (10) is shown, but the ventilation duct (10) can extend upward and be exposed to the ground. The ventilation duct (10) communicates with the interior of the equipment room (200) through the first ventilation opening (41) and the second ventilation opening (42), allowing outside air from the ground to pass between the interior of the equipment room (200). At this time, the second ventilation opening (42) and the ventilation duct (10) may be additionally provided on the other side of the equipment room (200).

[0034] The arc duct (20) is installed to connect the space between the first ventilation opening (41) and the second ventilation opening (42) with the interior of the electrical device (300). The electrical device (300) may be a device where arc generation is a concern during use, for example, a multi-circuit breaker, but is not limited to such examples. The arc duct (20) may be installed vertically between the electrical device (300) and the inner wall of the equipment room.

[0035] The interior of the electrical device (300) and the arc duct (20) can be connected through an underground space (202) below the floor surface (201) of the equipment room (200). For example, a first opening (203) may be located on the floor surface (201) below the electrical device (300) to connect the interior of the electrical device (300) and the underground space (202). Additionally, the bottom of the arc duct (20) may be located lower than the floor surface (201), and a second opening (204) may be located on the part of the arc duct (20) facing the underground space (202) to allow passage between the underground space (202) and the interior of the arc duct (20).

[0036] In a configuration where the electrical device (300) and the arc duct (20) are connected through an underground space (202), all flames and smoke from the arc explosion when an arc occurs can be transferred to the arc duct (20), thereby effectively suppressing the leakage of flames and smoke into the interior of the equipment room (200).

[0037] The upper end of the arc duct (20) may be located directly below the space between the first ventilation port (41) and the second ventilation port (42), and an opening / closing device (30) is installed above the upper end of the arc duct (20) and the first ventilation port (41) to control the opening and closing of the first ventilation port (41) and the arc duct (20). The opening / closing device (30) includes a separating plate (31) installed at the upper end of the arc duct (20) and a fixing plate (35) installed above the first ventilation port (41).

[0038] FIG. 3 is an enlarged view of the duct equipment shown in FIG. 2, and FIG. 4 is a partial enlarged perspective view of the separator plate among the duct equipment shown in FIG. 3.

[0039] Referring to FIGS. 1 to 4, the separator plate (31) is composed of a plate of a certain size that covers the top of the arc duct (20) and is connected to the top of the arc duct (20) by a first rotation axis (33) combined with a first elastic member (32). The first rotation axis (33) can be installed parallel to this corner at one corner directly below the first ventilation opening (41) among the four corners of the top of the arc duct (20).

[0040] A pair of first flanges (34) may be provided at the top of the arc duct (20) to be coupled to both ends of the first rotation axis (33) and to support the first rotation axis (33). The first elastic member (32) surrounds the end of the first rotation axis (33) in a coil shape, and both ends of the first elastic member (32) may be fixed to the first flange (34) and the first rotation axis (33), respectively.

[0041] The separator plate (31) is positioned parallel to the horizontal direction to cover the top of the arc duct (20) under normal circumstances, thereby closing the top of the arc duct (20). At this time, the first ventilation opening (41) is opened, and the ventilation duct (10) performs ventilation by passing through the first ventilation opening (41) and the second ventilation opening (42) to the interior of the equipment room (200). For convenience, the position where the separator plate (31) opens the first ventilation opening (41) and closes the arc duct (20) is referred to as the ‘first position’.

[0042] When an arc explosion occurs in the electric device (300), the separator plate (31) is lifted by the explosion pressure and rotates counterclockwise around the first rotation axis (33). When the separator plate (31) rotates counterclockwise from the horizontal position, the first elastic member (32) is deformed, and the deformed first elastic member (32) provides a restoring force that returns the separator plate (31) to the horizontal position.

[0043] The fixed plate (35) is composed of a plate of a certain size positioned parallel to the vertical direction above the first ventilation opening (41) and can be connected and installed on the ceiling of the equipment room (200) by a second rotation axis (37) coupled with a second elastic member (36). For example, a vertical plate (50) can be fixed to the ceiling of the equipment room (200), and the vertical plate (50) may be provided with a pair of second flanges (not shown) that are coupled to both ends of the second rotation axis (37) to support the second rotation axis (37).

[0044] The second rotation axis (37) is parallel to the first rotation axis (33) and can be installed directly above the first rotation axis (33). The second elastic member (36) surrounds the end of the second rotation axis (37) in a coil shape, and both ends of the second elastic member (36) can be fixed to the second flange (not shown) and the second rotation axis (37), respectively. The structure of the first rotation axis (33) and the first elastic member (32) shown in FIG. 4 can be applied in the same way to the second rotation axis (37) and the second elastic member (36).

[0045] The fixed plate (35) is normally positioned parallel to the vertical direction, and when the separator plate (31) rotates counterclockwise due to an arc explosion, it is pushed clockwise by the impact of the separator plate (31). When the fixed plate (35) rotates clockwise around the second rotation axis (37), the second elastic member (36) is deformed, and the deformed second elastic member (36) provides a restoring force that returns the fixed plate (35) to a vertical position.

[0046] The separator plate (31) and the fixed plate (35) are provided with a rotation angle limiting part (60) that limits the rotation angle of the separator plate (31) after rotation of the separator plate (31). The rotation angle limiting part (60) may include a first inclined surface (61) formed at the end of the separator plate (31) furthest from the first rotation axis (33), and a second inclined surface (62) formed at the end of the fixed plate (35) furthest from the second rotation axis (37).

[0047] When the separator plate (31) is in the first position, the first inclined surface (61) may be formed on the lower end of the drawing so as to face the interior of the arc duct (20), and when the fixed plate (35) is in the vertical position, the second inclined surface (62) may be formed on the left end of the drawing so as to face the interior of the equipment room (200). The fixed plate (35) and the rotation angle limiting part (60) function as a stopper to maintain the vertical state of the separator plate (31) rotated by the arc explosion.

[0048] Meanwhile, a first stop projection (71) that limits the rotation (clockwise rotation) of the separator plate (31) may be provided at the top of the arc duct (20) in contact with the first rotation axis (33). The first stop projection (71) may be located on one side (right side based on the drawing) of the top of the arc duct (20) facing the second ventilation port (42), and maintains the horizontal position of the separator plate (31) so that the separator plate (31) does not sag downward.

[0049] Additionally, a second stop projection (72) that limits the rotation of the fixed plate (35) (excessive rotation in a clockwise direction) may be provided at the bottom of the vertical plate (50) that contacts the second rotation axis (37). The second stop projection (72) may be located on one side (left side based on the drawing) of the bottom of the vertical plate (50) facing the interior of the equipment room (200), and suppresses the excessive rotation of the fixed plate (35) when the fixed plate (35) rotates due to the impact of the separating plate (31).

[0050] In the duct equipment (100) of the configuration described above, the first ventilation opening (41) may refer to the space between the bottom of the fixed plate (35) and the top of the arc duct (20). For example, the first ventilation opening (41) may refer to an open space enclosed by the bottom of the fixed plate (35), the inner walls on both sides of the equipment room (200), and the top of the arc duct (20), but is not limited to this example. The first ventilation opening (41) is normally open and communicates with the second ventilation opening (42), and is closed by the separating plate (31) when an arc occurs in the electrical device (300).

[0051] Next, the operation process of the aforementioned duct equipment (100) will be explained with reference to FIGS. 5 to 11.

[0052] Referring to FIGS. 3 and FIGS. 5, the separator plate (31) is normally positioned parallel to the horizontal direction to maintain a first position that opens the first ventilation port (41) and closes the arc duct (20). At this time, the ventilation duct (10) communicates with the interior of the equipment room (200) through the first ventilation port (41) and the second ventilation port (42).

[0053] Based on FIG. 5, a fan may be installed in the ventilation duct (10) on the left to introduce outside air into the equipment room (200), and a fan may be installed in the ventilation duct (10) on the right, which is close to the arc duct (20), to discharge the air from the equipment room (200) to the outside. When the separator plate (31) maintains the first position, normal ventilation is achieved in which outside air and the air in the equipment room (200) circulate.

[0054] Referring to FIGS. 6 to 9, an arc may be generated by a three-phase short circuit during the operation of the electric device (300). The arc explosion of the electric device (300) flows into the arc duct (20) through the underground space (202), and the high pressure caused by the arc explosion lifts the separator plate (31) upward. Accordingly, the separator plate (31) rotates 90° counterclockwise around the first rotation axis (33) to strike the fixed plate (35), and after striking, it passes the fixed plate (35) and rotates further counterclockwise.

[0055] Subsequently, the separator plate (31) rotates clockwise again by the restoring force of the first elastic member (32), and the fixed plate (35), which rotated clockwise by the force applied by the separator plate (31), rotates counterclockwise again by the restoring force of the second elastic member (36). At this time, the fixed plate (35), which has a smaller width than the separator plate (31), returns to a vertical state before the separator plate (31), and the separator plate (31), which rotated clockwise, comes into contact with the fixed plate (35) that has returned to a vertical state.

[0056] Referring to FIGS. 10 and 11, the contact between the separator plate (31) and the fixing plate (35) is formed by the contact between the first inclined surface (61) and the second inclined surface (62). A force acting on the separator plate (31) to return it to the first position is exerted by the first elastic member (32), but the fixing plate (35) resists the restoring force of the separator plate (31) and prevents the separator plate (31) from returning.

[0057] Accordingly, the separator plate (31) maintains a state parallel to the vertical direction, and the fixing plate (35) and the rotation angle limiting part (60) fix the position of the separator plate (31). In this way, after the arc is generated, the separator plate (31) maintains a vertical state to open the arc duct (20) and close the first ventilation port (41). For convenience, the position where the separator plate (31) opens the arc duct (20) and closes the first ventilation port (41) is referred to as the 'second position'.

[0058] When the separator plate (31) is in the second position, the interior of the equipment room (200) is blocked from the arc passage, thereby preventing flames and smoke from the arc explosion from leaking into the interior of the equipment room (200). The flames and smoke from the arc explosion are transmitted to the ventilation duct (10) through the second ventilation opening (42) and are discharged to the outside through the ventilation duct (10).

[0059] The separator plate (31) maintains a second position even after arc discharge is completed, thereby ensuring the safety of the worker when the worker performs maintenance on the equipment room (200). The separator plate (31) can return to a first position after the maintenance on the equipment room (200) is completed. For example, if the worker pushes the separator plate (31) slightly counterclockwise and pushes the fixing plate (35) clockwise so that the separator plate (31) passes under the fixing plate (35), the separator plate (31) returns to a first position by means of a restoring force.

[0060] As described above, the separator plate (31) of the opening and closing device (30) is configured to be interchangeable between a first position and a second position. In the first position, the arc duct (20) is closed and the first ventilation port (41) is opened to allow normal ventilation through the ventilation duct (10). In the second position, the first ventilation port (41) is closed and the arc duct (20) is opened to allow flames and smoke from an arc explosion to be quickly discharged outside the equipment room (200) through the ventilation duct (10).

[0061] At this time, the height of the fixed plate (35) is set to an appropriate height such that the rotating separating plate (31) touches the fixed plate (35) and strikes the fixed plate (35), and the first inclined surface (61) of the separating plate (31) and the second inclined surface (62) of the fixed plate (35) can be in close contact with each other.

[0062] The duct equipment (100) of the above configuration utilizes the ventilation duct (10) that is basically installed in the equipment room (200) for arc exhaust, so that a separate arc duct does not need to be installed outside the equipment room (200), thereby simplifying the overall configuration and reducing the manufacturing cost of the equipment room (200).

[0063] In addition, in the duct facility (100) of the above configuration, the first ventilation port (41) is automatically closed when an arc occurs, thereby effectively preventing safety accidents such as injury and suffocation of the worker. Also, since the opening and closing device (30) operates by arc pressure without a separate power source, maintenance is easy and the possibility of failure is low.

[0064] FIG. 12 is a flowchart showing the operation process of a duct system according to one embodiment of the present invention.

[0065] Referring to FIG. 12, a method of operating a duct facility according to one embodiment includes a ventilation operation step (S10) in which a separator plate maintains a first position to allow normal ventilation to be performed, an arc duct opening step (S20) in which a separator plate moves to a second position to open an arc duct when an arc occurs, an arc discharge step (S30) in which a separator plate maintains the second position to discharge an arc through a ventilation duct, and a separator plate return step (S40) in which the separator plate returns to the first position after the arc discharge is completed.

[0066] Referring to FIGS. 1 to 12, in the ventilation operation step (S10), the separator plate (31) maintains a first position that closes the arc duct (20) and opens the first ventilation port (41), and the ventilation duct (10) performs normal ventilation by passing through the interior of the equipment room (200) through the first ventilation port (41) and the second ventilation port (42).

[0067] In the arc duct opening stage (S20), the separator plate (31) rotates in one direction around the first rotation axis (33) due to the pressure from the arc explosion, and after striking the fixed plate (35), it rotates in the opposite direction due to the restoring force. At this time, the fixed plate (35) that rotated due to the striking of the separator plate (31) also returns to its initial position due to the restoring force, and the separator plate (31) cannot return to the first position due to the fixed plate (35) that returned to its initial position and stops at the second position.

[0068] In the arc discharge step (S30), the first inclined surface (61) of the separator plate (31) is in close contact with the second inclined surface (62) of the fixed plate (35) to maintain a second position, and the separator plate (31) in the second position opens the arc duct (20) and closes the first ventilation port (41) so that flames and smoke from the arc explosion are transferred to the ventilation duct (10). In this process, the ventilation duct (10) quickly discharges the flames and smoke to the outside, and the flames and smoke do not enter the interior of the equipment room (200).

[0069] After the arc exhaust and the repair of the equipment room (200) are both completed, in the separator return step (S40), the separator (31) returns to the first position, and normal ventilation is achieved again through the opening of the first ventilation port (41) and the ventilation duct (10) passes through the interior of the equipment room (200).

[0070] According to the operation method of the aforementioned duct equipment (100), no separate power source is required to open and close the arc duct (20), and the opening and closing of the arc duct (20) can be performed smoothly with the configuration of a simple opening and closing device (30). In addition, during the arc discharge process, the interior of the equipment room (200) is blocked from the arc discharge path, thereby effectively preventing safety accidents caused by the worker's exposure to the arc.

[0071] Although the present invention has been described as previously stated, those skilled in the art will readily understand that various modifications and variations are possible without departing from the concept and scope of the claims set forth below. Explanation of the symbols

[0072] 100: Ductwork 200: Equipment room 300: Electrical device 10: Ventilation duct 20: Arc duct 30: Switching device 31: Separator plate 32: First elastic member 33: First rotation axis 35: Fixed plate 36: Second elastic member 37: Second rotation axis 41: 1st Vent 42: 2nd Vent 50: Vertical plate 60: Rotation angle limiting part 61: First slope 62: Second slope

Claims

Claim 1 A ventilation duct provided on the outer side of a facility room where an electrical device is installed and communicating with the interior of the facility room through a first ventilation port and a second ventilation port facing each other, an arc duct provided in the facility room to connect the space between the first ventilation port and the second ventilation port with the interior of the electrical device, and an opening / closing device for controlling the opening and closing of the arc duct, wherein the opening / closing device includes a separating plate installed in the arc duct to enable mutual switching between a first position in which the first ventilation port is opened and the arc duct is closed, and a second position in which the arc duct is opened and the first ventilation port is closed, and a fixing plate located above the first ventilation port and fixing the separating plate to the second position, wherein the first ventilation port is located closer to the interior of the facility room than the second ventilation port, and the arc duct is located between the electrical device and the inner wall of the facility room, and an underground space is located below the floor surface of the facility room, and the interior of the electrical device and the interior of the arc duct are connected to each other through the underground space, and the separating plate is a first elastic member combined with A duct system that is rotatably installed at one corner below the first ventilation opening of the upper part of the arc duct by means of a rotating shaft, rotates by arc pressure when an arc occurs to switch to the second position, and the fixed plate is connected to the ceiling of the equipment room and is provided rotatably by means of a second rotating shaft coupled with a second elastic member. Claim 2 A duct facility according to claim 1, wherein a vertical plate is fixedly installed on the ceiling of the facility room, the second rotation axis is rotatably connected to the lower end of the vertical plate, and the fixed plate is positioned parallel to the vertical direction.

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