KR101079984B1 - Switchgear with metal enclosure - Google Patents

Abstract

On the other end of the breakers 8a and 8b, the horizontal bus line 11 connected to one end of the breakers 8a and 8b via a branch conductor 12, and the other ends of the breakers 8a and 8b. In the metal-closed switchgear in which the cable 15 to be connected and the controller are housed in the box 1, the circuit breakers 8a and 8b are parallel to the earth, Moreover, it arrange | positions to the left-right direction, seeing from the front side of the box 1, and arrange | positions it to the front side in the box 1, and the horizontal bus line 11 and the branch conductor 12 are the breakers 8a and 8b. It was arrange | positioned in the upper side of back of the, and the cable 15 was arrange | positioned in the lower side of the back of breaker 8a, 8b.

Description

Metal Closed Switch Gears {SWITCHGEAR WITH METAL ENCLOSURE}

The present invention relates to a metal-closed switchgear in which a plurality of circuit breakers are housed in a switchboard.

The metal-closed switchgear is a switchboard for accommodating a breaker or the like in a switchboard and for safely distributing electricity. A plurality of circuit breakers are often housed in one switchboard. In addition, in the metal closed switch gear, there is a demand to divide each room such as a bus chamber, a breaker chamber, and a cable chamber by partition plates in order to improve safety. In addition, when an arc occurs due to an unexpected short circuit inside the switchboard, the internal pressure may rise rapidly and may damage the human body around the switchboard. Therefore, the internal pressure is safely discharged. Is required.

As a conventional metal-closed switchgear in which a plurality of circuit breakers are accommodated and the inside of the switchboard is housed, for example, a control chamber is provided immediately behind the front door, and then the circuit breakers are stored in two upper and lower stages. A breaker chamber is arranged, and a bus chamber is provided at the rear of the breaker chamber, in which one main terminal of each breaker and a main bus line connected by branch conductors are housed, and behind the breaker chamber. A metal-closed switchgear in which a cable chamber in which a cable connected to a terminal is housed is arranged is disclosed (see Patent Document 1, for example).

In addition, as a metal-closed switchgear in which a plurality of circuit breakers are housed and provided with a pressure relief plate, for example, the inside of the box may include a plurality of circuit breakers, controller chambers, common pressure chambers, and current transformers. Disclosed is a metal-closed switchgear which is divided into a chamber, a bus bar, a longitudinal bus bar, a cable room, and the like, in which a pressure plate is installed in the ceiling of the common pressure chamber, the cable chamber, and the upper breaker chamber. When an accident occurs in the cable room or the upper breaker room, the pressure plate of the ceiling of the room is opened, and the pressure caused by the arc generated in the lower breaker room or the longitudinal busbar without direct pressure plate is transferred through the common pressure room. It is comprised so that it may discharge | release to the upper part of itself (for example, refer patent document 2).

Patent Document 1: Japanese Patent Application Laid-Open No. 2000-333314 (Page 4, Fig. 1)

Patent Document 2: Japanese Patent Application Laid-Open No. 10-322811 (Page 4, FIGS. 1 and 2)

Problems to be Solved by the Invention

In the closed metal switchgear shown in Patent Literature 1, since the circuit breaker is vertically stacked, it is difficult to secure a space for accommodating the controller on the upper side of the circuit breaker, and the controller uses a front door. To be mounted. For this reason, the breaker is arranged at a predetermined distance behind the front door so as not to interfere with the controller mounted on the door, and the busbar chamber and the cable chamber are arranged behind the front door, so that the switchboard has a depth dimension. There was a problem that becomes large.

The metal-closed switchgear shown in Patent Literature 2 is configured to individually discharge the pressure generated in each chamber even when the circuit breakers are arranged in multiple stages up and down, but for this purpose, a separate common pressure chamber is required. There was a problem that the volume of the switchboard was increased and the distribution panel was enlarged. In addition, when the breaker is stacked in the longitudinal direction, there is a problem that the division between the chambers becomes complicated, and the pressure discharge path is also complicated, which makes it difficult to efficiently discharge the internal pressure.

The present invention has been made to solve the above problems, and an object thereof is to reduce the dimension in the depth direction by studying the arrangement of the circuit breaker. Moreover, it aims at simplifying the division of each room. In addition, an object of the present invention is to obtain a metal-closed switchgear having a structure that is easy to discharge the internal pressure increase during a short circuit accident.

Means for solving the problem

The metal-closed switchgear according to the present invention includes a plurality of circuit breakers, a horizontal busbar connected to one end of the breaker through a branch conductor, a cable connected to the other end of the breaker, and a controller in the box body. In the housed closed metal switchgear, a plurality of circuit breakers are arranged in a parallel direction with respect to the earth and arranged side by side in the left and right directions when viewed from the front side of the box body.

Effect of the Invention

According to the metal-closed switchgear of this invention, a some circuit breaker is arrange | positioned in parallel with respect to the earth, and arrange | positioned in the left-right direction seen from the front side of a box body, and arrange | positions a circuit breaker approaching the front door of a box body. The controller and parts can be arranged in a space formed up and down, and the arrangement of the breaker, bus, breaker, and cable can be easily arranged. Can be shrunk.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows the metal closed switchgear which concerns on Embodiment 1 of this invention.

2 is a side cross-sectional view of FIG. 1.

FIG. 3 is a rear view seen from III-III of FIG. 2.

Fig. 4 is a side cross-sectional view illustrating the pressure discharge path at the time of an accident in the breaker chamber of the metal-closed switch gear according to Embodiment 2 of the present invention.

Fig. 5 is a side cross-sectional view illustrating a pressure discharge path at the time of an accident in a cable chamber of a metal closed switch gear according to Embodiment 2 of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION [

Embodiment 1

Hereinafter, the metal closed switch gear of the present invention will be described in detail with reference to the drawings. First, with reference to FIGS. 1-3, the whole structure of a metal closed switchgear is demonstrated. The metal-closed switchgear is entirely covered with a metal box (1), and the front side extends from side to side on the upper side of the instrument compartment door (2) and on the lower side as shown in FIG. Two breaker chamber doors 3a and 3b are provided to be opened and closed by hinges, respectively. Ventilation ventilation windows 4 are provided on the lower sides of the breaker chamber doors 3a and 3b.

The inside of the box body 1 is divided into a plurality of chambers, and a breaker chamber 5a is disposed above the breaker chamber door 3a on the right side, and the upper side of the breaker chamber door 3b on the left side is similarly upward. The breaker chamber 5b is arrange | positioned at this, and the whole lower part of both breaker chambers 5a and 5b becomes the connection work room 6. In addition, the inside of the instrument chamber door 2 is the instrument chamber 7 as a whole, and control devices, such as instrumentation and a relay, are accommodated.

The breaker 8a is housed inside the breaker chamber 5a, and the breaker 8b is housed inside the breaker chamber 5b, and in the case of a drawout type breaker, it is possible to draw out to the front surface. Each rear surface side of the breaker 8a, 8b has the breaker terminal (not shown) connected to the movable side electrode and the fixed side electrode of a breaker main body up and down at predetermined intervals.

As shown in the side view of Fig. 2, an upper connecting terminal 9a and a lower connecting terminal 9b connected to the above-mentioned circuit breaker terminals are arranged on the rear walls of the breaker chambers 5a and 5b so as to be insulated from the wall surface and penetrate the wall surface. have.

The space on the back side of the circuit breaker chambers 5a and 5b is divided between the upper connection terminal 9a and the lower connection terminal 9b for two minutes, and the upper space is the busbar chamber 10. In the section 10, a three-phase horizontal bus bar 11 is arranged insulated and arranged on the box 1, and a branch connecting the horizontal bus bar 11 and the upper connection terminal 9a to the upper side. The conductor 12 is supported by the box 1 by the support insulator 13 and is accommodated. Moreover, the ventilation tower 14 is provided in the top plate of the box 1 of the upper part of this bus-bar chamber 10. As shown in FIG.

On the other hand, the space below is comprised of individual cable rooms 16a, 16b in which the cable 15 of the load side connected to each of the breakers 8a, 8b is accommodated (refer FIG. 3). The cable 15 is connected to the lower connecting terminal 9b via a connecting conductor 17, and a current transformer 18 penetrates and is provided in the middle of the connecting conductor 17.

As described above, the box 1 is partitioned into a plurality of yarns for improved safety, and each yarn is partitioned by partition plates 19 to 24 as shown in Figs. It consists. The unit to divide depends on a specification and a specification. Basically, breaker room, mother room, cable room and instrument room are divided into separate rooms. If there are a plurality of circuit breakers, a circuit breaker chamber is formed for each circuit breaker. As shown in the figure, each cable connected therein may be divided into breaker units and all cables may be collectively used as a cable room. In addition, a bus bar may be carried out collectively.

Moreover, although the case where the bus-bar chamber 10 was arrange | positioned upward and the cable chambers 16a and 16b was arrange | positioned below was shown in the figure, the bus-bar chamber 10 was lower and the cable chambers 16a and 16b were upward. It may be arranged.

The 1st characteristic of this invention is the point which arrange | positioned several circuit breakers (two circuit breakers 8a, 8b in this embodiment) in parallel with an earth, and arrange | positioned in the left-right direction seen from the front side of a box. (The arrangement of these breakers is abbreviated as horizontal parallel arrangement in the following description.)

Next, this operation will be described.

Metal-closed switchgear is usually used with a plurality of switchboards arranged in a horizontal direction. The height of these switchboards is determined to a predetermined height from the place environment, specification, specification, etc. to be installed, and is uniformly matched to the height.

If the plurality of circuit breakers are arranged in a vertical direction, such as in Patent Document 1 described in the Background Art, within the determined height, it becomes difficult to arrange the instrument chamber on the same side as the circuit breaker, immediately after the front door. The instrument chamber is provided, and the breaker chamber and the busbar chamber and the cable chamber are arranged behind, and the dimension in the depth direction becomes large.

On the other hand, by arranging the circuit breakers 8a and 8b in a horizontal parallel arrangement, the space formed above the circuit breakers 8a and 8b can be used as the instrument chamber 7, and therefore the circuit breakers 8a and 8b can be used. It is possible to arrange 8b) in front of the breaker doors 3a and 3b on the front side. In Fig. 2, opening holes are formed at opposite positions of the breaker doors 3a and 3b with the breakers 8a and 8b, and the breaker doors 3a and 3b are closed with respect to the door surface and the front of the breakers 8a and 8b. The case where the circuit breakers 8a and 8b are provided to the front limit of the circuit breaker rooms 5a and 5b so that an operation panel part may become substantially the same surface is illustrated. The part shown by the dashed-dotted line is the protective cover 25. As shown in FIG.

In addition, by arranging the circuit breakers 8a and 8b horizontally and parallelly, the upper connection terminals 9a can be arranged horizontally in the busbar chamber 10 behind the circuit breaker chambers 5a and 5b. As shown in the figure, the connection between the upper connection terminal 9a and the horizontal bus bar 11 disposed above can be connected by a simple conductor path without the branch conductors 12 crossing intricately.

Similarly, since the lower connecting terminals 9a can be arranged horizontally in the cable chambers 16a and 16b, the cable 15 and the lower connecting terminals 9a which rise from the bottom surface are connected to the connecting conductors 17. You can easily connect through

In this way, the bus arrangement and the cable arrangement including the branch conductor can be simplified, and the above-described breaker can be arranged on the front side, whereby the dimension in the depth direction can be greatly reduced.

The connection structure of the breakers 8a and 8b and the horizontal bus line 11 and the breakers 8a and 8b and the cable 15 may be basically increased only in the horizontal direction even if the number of breakers is increased. The dimension in the depth direction does not increase.

Moreover, when the circuit breakers 8a and 8b are arrange | positioned near the center with respect to the up-down direction of the box 1, the length of the branch conductor 12 extended in an up-down direction can be made long, and the big bus chamber 10 ), The heat dissipation effect of the branch conductor 12 can be expected.

In addition, when partitioning each chamber by partitioning the inside of the box 1 with partition plates 19-24, since the partition structure is simple, the number of partition plates is small, the shape is simple, and the manufacture and assembly are easy. It becomes easy. Even if the number of circuit breakers increases, the basic configuration does not change, and a partition plate may be added between the increased circuit breakers and the corresponding cable.

In addition, a space formed below the breakers 8a and 8b can be used as the connection work room 6. The connection work room 6 is provided with a terminal block for relaying a control line or a power line connecting the control unit of the meter room 7 to the outside of the metal closed switch gear. Therefore, the connection work room 6 leaves almost no space since the device is not housed except for the terminal block. As shown in FIG. 2, when the bus chamber 10 is arranged above and the cable chambers 16a and 16b are arranged below, the cable 15 is placed just behind the connection work chamber 6, so that the breaker chamber is located. By opening the doors 3a and 3b and removing the partition plate 23 on the rear side of the connection work chamber 6, it is possible to access the cable 15 from the front side of the switchboard. That is, the cable connection work at the time of installation and the maintenance of a cable can be performed from the front side of a switchboard. For this reason, since a work space is not required on the back of the switchboard, the metal-closed switchgear can be installed up to the rear wall limit, so that the space in the building can be effectively used.

In addition, in the case where the control line is introduced from the upper side of the box 1, the terminal block is provided, for example, in the instrument chamber 7, and partition plates of the connection work chamber 6 and the cable chamber portions 16a and 16b. (23) may be omitted and the whole may be a cable chamber.

As described above, according to the invention of the present embodiment, a plurality of circuit breakers, a horizontal bus bar connected to one end side of the breaker through a branch conductor, a cable connected to the other end side of the breaker, and a controller are housed in the box body. In the metal-closed switchgear, a plurality of circuit breakers are arranged in parallel to the ground and arranged side by side in the left and right directions when viewed from the front side of the box body, so that the circuit breaker can be arranged near the front door of the box body. In addition, controllers and parts can be arranged in spaces formed up and down, and the arrangement of the circuit breakers, buses, circuit breakers, and cables can be easily arranged, thereby reducing the size of the switchboard in the depth direction. have.

Moreover, the breaker is arranged on the front side of the inside of the box, the horizontal busbar, the branch conductor and the cable are arranged in either one of the up and down directions behind the breaker, and the controller is placed above the breaker, thereby providing the depth of the box. The dimension of the direction can be reduced, and the space can be saved.

In addition, a breaker chamber for storing each breaker individually inside the box body, a bus chamber for storing horizontal busbars and branch conductors, a cable room for storing cables integrally or in units connected to the breakers, and a controller The compartment structure between the compartments can be simplified when the compartments are divided into instrument chambers and the compartments are partitioned by partition plates to improve safety. It becomes possible to plan reduction.

In addition, the bus bar and the cable room are arranged so that the bus bar is on the upper side and the cable chamber is on the lower side, and the connection work room is provided on the lower side of the breaker chamber, whereby the cable can be accessed from the front side of the switchboard. Cable connection work and cable maintenance can be performed from the front side of the switchboard. For this reason, for example, when the metal-closed switchgear is installed indoors, it can be installed up to the wall limit without leaving the work space behind the switchboard, so that the space in the building can be effectively used.

Embodiment 2 Fig.

4 is a side sectional view of a metal closed switch gear according to Embodiment 2. FIG. Since the front view is equivalent to FIG. 1 demonstrated in Embodiment 1, and its internal structure is the same as that shown in FIG. 2 and FIG. 3 of Embodiment 1, the same part is shown with the same code | symbol and description is abbreviate | omitted and only another part is demonstrated.

In Fig. 4, openings are formed in the partition plates 22 between the breaker chambers 5a and 5b and the busbar chamber 10, respectively, and the pressure-proof doors 27 are individually closed to close the openings. It is installed. Moreover, the pressure-proof door 28 is similarly provided also in the partition board 24 of each cable room 16a, 16b and the bus bar room 10, respectively. The pressure-proof doors 27 and 28 are fixed to the respective partition plates 22 and 24 by hinges, and in a normal state, the openings are closed to function as a part of the partition plates 22 and 24. When the pressure rises rapidly in either of the breaker chambers 5a and 5b or the cable chambers 16a and 16b, it is comprised so that it may open to the bus-bar chamber 10 side.

Next, the operation will be described.

If an arc occurs due to an unexpected short-circuit inside the switchboard, the internal pressure may rise rapidly, which may harm the human body around the switchboard. As a countermeasure, in this embodiment, the pressure-proof doors 27 and 28 are provided in each breaker room 5a, 5b and each cable room 16a, 16b.

4, the pressure discharge path | route when the internal short circuit accident etc. generate | occur | produced in the breaker chamber 5a (or 5b) is shown by the arrow. For example, when a short circuit accident occurs at the accident occurrence point 29, the pressure in the breaker chamber 5a is rapidly increased due to the arc, and the pressure relief door 27 is opened so that the pressure is at the rear busbar chamber 10. Is discharged. As a result, while the internal pressure in the breaker chamber 5a is reduced in pressure, the gas of high temperature and high pressure which has been discharged into the large space of the bus chamber 10 is decompressed, and is installed on the top plate of the box 1 along the path as shown by the arrow. It is discharged from the ventilation tower 14 to the outside.

FIG. 5 is a diagram illustrating a pressure discharge path when an internal short circuit accident occurs in the cable chamber 16a (or 16b).

If a short circuit accident occurs at the position of the accident occurrence point 30 in the cable chamber 16a, for example, the pressure rapidly rises due to the arc, and the pressure relief door 28 is opened, and as indicated by the arrow, the high temperature The high-pressure gas is discharged to the outside from the ventilation tower 14 along the path as shown by the arrow while the pressure is reduced to the bus chamber (10).

In this way, the internal pressure generated in the switchboard is discharged from the upper part of the switchboard to the outside, thereby securing the safety of the personnel around the switchboard.

In the invention of the present embodiment, since the circuit breakers 8a and 8b are arranged side by side, the pressure discharge path can be easily configured by simply adding an opening hole and a pressure relief door to the partition plates 22 and 24. Even if the number of breakers increases, it is not necessary to add additional ducts or compartments.

In addition, the wide busbar chamber 10 with few obstacles connected to the top plate of the box 1 formed behind the breaker chambers 5a and 5b is common between the breaker chambers 5a and 5b and the cable chambers 16a and 16b. Since it can be used as a pressure release path of, the pressure can be reduced quickly in a large space.

In addition, although the pressure-proof doors 27 and 28 open and close by a hinge, it is not limited to this, For example, the strength of a part of partition plates 27 and 28 is weakened, and when an internal pressure raises, The plastic deformation may be performed so as to be broken and opened.

In addition, although the case where the pressure-proof door was provided in each of the two cable chambers was demonstrated above, when a cable chamber is common, you may provide one pressure-proof door in the chamber.

As described above, according to the invention of the present embodiment, a pressure-proof door for pressure release is provided in a partition plate that divides each breaker chamber and the bus-bar chamber when the internal pressure of each breaker chamber increases. By providing a ventilation tower in the top plate, when a short circuit accident occurs in the breaker chamber, the pressure is reduced in the bus chamber and discharged to the outside through the ventilation tower, thereby ensuring the safety of the personnel around the switchboard.

In addition, a short-circuit accident in the cable interior is provided by installing a pressure-proof door that discharges pressure when the internal pressure of the cable chamber rises in a partition plate that divides the cable chamber and the bus-bar chamber and installs a ventilation tower on the top plate of the upper box of the bus chamber. Is generated, the pressure is reduced in the bus chamber and discharged to the outside through the ventilation tower, thereby ensuring the safety of the personnel around the switchboard.

As described above, the present invention can be used for a metal-closed switch gear in which a plurality of circuit breakers are accommodated in a switchboard.

Claims (6)

A plurality of circuit breakers, a horizontal bus bar connected to one end of each breaker through a branch conductor, a cable connected to the other end of each breaker, and a metal closed switch in which a controller is housed in a box In gear, The plurality of circuit breakers are arranged in parallel to the ground, and are arranged side by side in the left and right directions when viewed from the front side of the box, and are arranged on the front side of the inside of the box. Become, An interior of the box includes a breaker chamber for individually storing each breaker, a bus chamber for accommodating the horizontal bus bar and the branch conductor, a cable chamber for storing the cable, and an instrument for accommodating the controller. Partitioned into yarns, the mutual spaces of the respective yarns are partitioned by partition plates, The instrument chamber is disposed above the breaker chamber and a connection work room is installed below the breaker chamber. The busbar chamber and the cable chamber are arranged in such a way that the busbar chamber is upward from the rear of the breaker chamber and the cable chamber is lower. The method according to claim 1, In the partition plate which divides each breaker room and said bus-chamber chamber, the pressure-proof door which discharges pressure when the internal pressure of each breaker room rises is provided, and the ventilation tower is installed in the top plate of the box upper part of the bus-chamber chamber. The closed metal switchgear characterized in that it is installed. The method according to claim 1 or 2, In the partition plate which divides the said cable chamber and said bus-bar chamber, the pressure-proof door which pressure-releases when the internal pressure of the said cable chamber rises is installed, and the ventilation tower is provided in the top plate of the said box body in the upper part of the bus-bar chamber. Metal closed type switchgear. delete delete delete

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