JP2007221878A - Switchgear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a switchgear in which high temperature gas emitted in case of accident can be prevented from leaking to a maintenance space around the switchgear. <P>SOLUTION: Inside of a housing 1 is sectioned into a plurality of compartments, a main circuit component or a control component is contained in each compartment, and bursting plates 18a-18c which are released by abnormal pressure in the compartment are provided in the ceiling section 1a of the housing 1 communicating with the compartment containing the main circuit component. In such a switchgear, a screen 19 for surrounding the bursting plates 18a-18c is provided on the outer circumference of the ceiling section 1a of the housing 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a metal-closed switchgear, and more particularly to the structure of the pressure relief part.

  As a switchgear having a pressure relief plate, for example, the inside of the box is divided into a plurality of circuit breaker rooms, control equipment rooms, common pressure relief rooms, current transformer rooms, busbar rooms, vertical busbar rooms, cable rooms, etc. A switchgear in which a pressure release plate is provided on the ceiling of the common pressure release chamber, the cable chamber, and the upper circuit breaker chamber is disclosed. When an accident occurs in the cable room or upper circuit breaker room, the pressure release plates on the ceiling of those rooms are opened, and the pressure caused by the arc generated in the lower circuit breaker room or vertical bus room without the direct pressure release plate is It discharge | releases to the upper part of a box through a common pressure release chamber (for example, refer patent document 1).

Japanese Patent Laid-Open No. 10-322811 (page 4, FIG. 1)

  In the conventional switchgear as shown in Patent Document 1, when an arc occurs due to an internal short circuit accident or the like, the internal pressure of the accident occurrence chamber rises, the pressure relief plate at the top of the box body is opened, and the internal high temperature gas is released. It is designed to be released to the outside. Normally, the height of the ceiling of the electric room where the switchgear is installed is limited, and the height of the switchgear needs to have a predetermined dimension. It will bounce off the ceiling and go into the maintenance space around the switchgear. At this time, if there is an operator in the vicinity of the switchgear, there is a problem in that it may be exposed to a high-temperature release gas.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a switchgear that prevents high-temperature gas released at the time of an accident from flowing into a maintenance space around the switchgear. To do.

  In the switchgear according to the present invention, the inside of the housing is partitioned into a plurality of compartments, and the pressure relief plate that is opened by the abnormal pressure in the compartment is provided on the ceiling portion of the housing that communicates with the compartment in which the main circuit components are stored. In the switchgear, a partition for enclosing the pressure release plate is erected on the outer periphery of the ceiling portion.

  Further, in a switchgear in which a plurality of switchboards having pressure release plates are arranged in a row, a partition for enclosing the entire pressure release plates of the plurality of switchboards is erected on the outer periphery of the entire ceiling portion of the plurality of switchboards. is there.

  According to the switchgear of the present invention, the switchgear has the pressure release plate on the ceiling part, and the partition for enclosing the pressure release plate is erected on the outer periphery of the ceiling part. When the hot gas blows off the pressure release plate, the hot gas can be prevented from spreading to the surroundings by the screen, and can be prevented from entering the maintenance space around the switchgear.

  Further, in the switchgear in which a plurality of switchboards having pressure release plates are arranged in a row, a partition for enclosing the entire pressure release plates of the plurality of switchboards is erected on the outer periphery of the entire ceiling portion of the plurality of switchboards. Similarly to the above, it is possible to prevent the hot gas generated at the time of the accident from entering the maintenance space around the switch gears arranged in a line.

Embodiment 1 FIG.
1 is a side sectional view of a switchgear according to Embodiment 1 of the present invention, FIG. 2 is a perspective view of FIG. 1, and FIG. 3 is a diagram showing a flow of gas ejected in the event of an accident in FIG.
First, the internal configuration of the switchgear will be described with reference to FIG. The interior of the ground metal casing 1 is partitioned into a plurality of compartments. On the left side (front side) of the figure, a circuit breaker compartment 4 in which a drawer-type circuit breaker 3 mounted on the carriage 2 is accommodated is arranged. The circuit breaker 3 can be pulled out from the front side. Yes. On the rear wall of the circuit breaker compartment 4, disconnecting portions 5 a and 5 b of the main circuit are fixedly provided at a predetermined interval in the vertical direction, and can be attached to and detached from the connection terminals protruding from the rear surface of the circuit breaker 3. ing. The disconnecting portions 5a and 5b are provided with main circuit terminals 6a and 6b.
Above the circuit breaker compartment 4 is a controller compartment 7 in which a control device (not shown) is accommodated.

  Above the rear side of the circuit breaker compartment 4 is a bus compartment 10 in which a three-phase bus 8 is supported by a support insulator 9 and is connected to one end side of the circuit breaker 3. The main circuit terminal 6a and the bus 8 are connected and accommodated by the branch bus 11. Behind the bus compartment 10 is a cable compartment 13 in which the load-side cable 12 is accommodated. The main circuit terminal 6b of the disconnecting portion 5b connected to the other end side of the circuit breaker 3 and the cable 12 are connected by a load side conductor 14, and a current transformer 15 is provided through the middle. A ground switch 16 is connected to the main circuit terminal 6b.

  A door 17 that is opened and closed by a hinge is provided on the front side of the housing 1, and each compartment constitutes an independent chamber. The compartments in which the main circuit components are stored, that is, the circuit breaker compartment 4, the bus compartment 10 and the cable compartment 13 communicate with the top plate of the ceiling portion 1a of the housing 1, and the pressure relief plate is provided on the top plate of each compartment. 18a, 18b, and 18c are provided. These pressure relief plates may be configured to be openable and closable at one end by a hinge.For example, using the top plate itself, the strength of the top plate of the part that becomes the outer shape of the pressure relief plate is reduced, When the internal pressure rises, it may be configured to be plastically deformed and to be broken and opened.

  Note that the internal configuration of the housing 1 illustrated in FIG. 1 is an example, and is not limited to the arrangement configuration illustrated. Usually, it is composed of a compartment for housing the drawer device, a bus compartment, a cable compartment, and a controller compartment, but there may be no cable compartment, and other configurations may be used. In either case, a pressure relief plate is provided in a compartment in which main circuit components that may generate hot gas in the event of an accident are stored.

Further, as a feature of the present invention, a partition 19 for enclosing the pressure relief plates 18a to 18c is erected on the outer periphery of the ceiling portion 1a in the vertical direction. As shown in the perspective view of FIG. The enclosed space above is open. The screen 19 is fixed to the outer peripheral frame of the ceiling portion 1a by bolting or the like, for example.
2 shows a state in which the pressure release plates 18a to 18c are opened. However, in a normal state, the pressure release plates 18a to 18c are closed, and a state as shown in the figure is obtained in an accident described below.

  Next, the pressure relief at the time of an accident and the effect | action of the partition 19 are demonstrated. 3A and 3B are views for explaining a pressure release structure, where FIG. 3A is a plan view and FIG. 3B is a side view. For example, when an arc occurs due to an unexpected short circuit accident in the circuit breaker 3, the pressure in the circuit breaker compartment 4 rises, and the internal gas that has reached a high temperature flows as shown by the arrow in the figure, and the ceiling portion 1a above it. The pressure release plate 18a provided on the upper side opens upward to release the internal pressure. Similarly, the pressure rise in the bus compartment 10 is released to the outside by the pressure relief plate 18b at the ceiling, and the pressure rise in the cable compartment 13 is released to the outside by the pressure relief plate 18c provided at the ceiling. Since the pressure relief plate is provided for each compartment, it is possible to prevent the accident of each compartment from spreading to the adjacent room.

  Since the partition 19 is provided around the ceiling portion 1a of the housing 1 so as to surround the pressure release plates 18a to 18c, the high-temperature gas ejected to the outside from the pressure release plates 18a to 18c is discharged upward, In the process, it is dispersed in the atmosphere, the pressure is weakened, and the temperature drops. Since the switchgear is usually installed in an indoor electric room, the ceiling of the electric room is present above the ceiling of the housing 1 without much space (for example, the height of the switchgear is 2.3 m). , Ceiling height 2.9m). If there is no partition 19, the hot gas spouted upwards rebounds from the ceiling of the electric room and wraps around the maintenance space around the switchgear. At this time, if there is an operator in the maintenance space, the operator may be exposed to high-temperature gas, but the screen 19 prevents sneaking around, so that the operator can release high-temperature released gas even in the event of an accident. Never bathe.

  FIG. 4 is a diagram showing an example in which a plurality of switch gears equivalent to those described in FIGS. 1 and 2 are arranged in a row. The switch gears are provided with partitions, and the partitions 19 can be individually assembled irrespective of other switch gears to be mounted.

  As described above, according to the invention of the present embodiment, the inside of the housing is partitioned into a plurality of compartments, and the ceiling portion of the housing that communicates with the compartment in which the main circuit component is stored is released by the abnormal pressure in the compartment. In the switchgear provided with a pressure relief plate, a partition for enclosing the pressure relief plate is provided on the outer periphery of the ceiling, so that the pressure in the compartment rises due to an arc generated by an accident of the main circuit part, etc. When the pressure relief plate is pushed open and ejected, it can be prevented from spreading around the hot gas due to the screen, and can be prevented from entering the maintenance space around the switchgear, so that the operator Never be exposed.

Embodiment 2. FIG.
FIG. 5 is a perspective view of a switchgear according to Embodiment 2 of the present invention. Since the internal configuration of the switch gear is the same as that of FIG. 1 of the first embodiment, the description thereof will be omitted, and the description will focus on the differences from the first embodiment.
The switchgear of the present embodiment is a case where a plurality of switchboards are arranged in a row. As shown in the figure, a partition 23 for enclosing the entire pressure release plates 22a, 22b, 22c of the plurality of switchboards 21a, 21b, 21c arranged in a row is erected on the outer periphery of the entire ceiling of the switchboards 21a-21c. ing. FIG. 4 of the first embodiment described above is also arranged in a row, but in the case of FIG. 4, a plurality of partitions provided with screens around the ceiling of the switchboard alone are combined. In the case of FIG. 5, a partition is provided around the entire ceiling of the plurality of switchboards.

  For example, when there are three rows of switchboards as shown in the figure, the partition 23 is provided on the front, back and left side of the leftmost switchboard 21a, and is provided on the front, back and right side of the rightmost switchboard 21c. 21b shows a case where it is provided on the front surface and the back surface, and each is connected by bolting, for example. The connection method may be welding or adhesion in addition to bolting. Further, in addition to the illustration, for example, the front surface and the back surface may each be constituted by a single plate.

As described above, according to the invention of the present embodiment, the partition for enclosing the entire pressure release plate provided on the ceiling part of the distribution boards arranged in a plurality of rows is provided on the outer periphery of the entire ceiling part of the plurality of distribution boards. In the switchgears arranged in a row, when hot gas generated due to an internal accident or the like is pushed out and blown off the pressure release plate, it prevents the hot gas from spreading to the surroundings due to the screen, and around the switchgear Therefore, it is possible to prevent the operator from entering the maintenance space, thus ensuring the safety of the operator around the switchgear.
In addition, the number of parts can be reduced and the material cost can be reduced as compared with the case where each switchboard is provided with a single partition.

Embodiment 3 FIG.
6A and 6B are external views of a switchgear according to Embodiment 3 of the present invention. FIG. 6A is a plan view and FIG. 6B is a side view. Since the internal configuration of the switchgear is the same as that of FIG. 1 of the first embodiment, the description thereof will be omitted, and the description will focus on the differences from the first embodiment.
In the switchgear of the present embodiment, an inclined portion 24a that is inclined inward is formed on the entire periphery of the upper side of the partition 24 provided on the ceiling portion of the housing 1 so as to narrow the open space on the upper side. It is a thing. Although the inclined portion 24a is a straight line in the figure, it may be bent in an arc shape.
As shown in FIG. 6 (b), when an accident occurs in the compartment inside the housing 1, the pressure in the compartment rises due to the arc, and the pressure relief plate provided on the ceiling 1a of the compartment opens upward, and the arrow Release the internal pressure as shown in. At this time, since the inclined portion 24a directed inward is provided on the upper side of the partition 24, the injected high temperature gas is collected on the central portion side and effectively suppresses the sneak around to the periphery of the switch gear.

  Although the figure shows the case of a switchgear constituted by a single control panel, as shown in FIG. 5 described in the second embodiment, a partition surrounding the entire pressure release plates of a plurality of switchboards arranged in a row has a plurality of Even when standing on the outer periphery of the entire ceiling of the switchboard, a similar effect can be obtained by forming an inwardly inclined portion on the upper side of the partition.

  As described above, according to the invention of the present embodiment, since the inclined portion that is inclined inward is formed on the entire periphery on the upper side of the partition, the pressure relief plate is opened in the event of an accident, and high-temperature gas is ejected. In this case, high temperature gas can be gathered near the center of the partition, so that it can be effectively prevented from going around the partition and around the switchgear. The sex can be further improved.

Embodiment 4 FIG.
7A and 7B are external views of a switchgear according to Embodiment 4 of the present invention. FIG. 7A is a perspective view, and FIG. 7B is a front view of the main part. The internal configuration of each switchboard constituting the switchgear is the same as that of FIG. 1 of the first embodiment, and the arrangement of the panel is the same as that of the second embodiment, so that the description thereof will be omitted and the description will focus on the differences. To do.

  The partition is provided on the entire outer periphery of the ceiling portion of the switchgear arranged in the same manner as in the second embodiment, but the switchgear of the present embodiment covers the open upper portion of the partition 25 with the cover 26. The openings 27 are formed on the wall surfaces on both sides of the partition 25 in the row board direction (distribution board arrangement direction). In the figure, a case where a duct 28 is further provided in the opening 27 is shown.

  When a large accident occurs inside the compartment of the housing and a large amount of high-temperature gas is injected, it may not be possible to prevent the surroundings from being surrounded by the partition around the pressure relief plate alone. Even in such a case, since the upper portion of the partition 25 is covered with the cover 26 as shown in the figure, the gas whose pressure and temperature have been lowered in the space surrounded by the partition 25 and the cover 26 is moved to the side. It is guided from the opening 27 to the duct 28 and discharged to the outside. When the duct 28 is provided, the length is preferably 850 mm or more in consideration of the case where an operator is present below.

In addition, the gas pressure at the time of the accident becomes considerably high instantaneously. From the viewpoint of safety, when the cover 26 is fastened to the upper portion of the partition 25 by bolting or the like, it is necessary to tighten it firmly by increasing the number of bolts.
Therefore, as a method for fixing the cover simply and surely, for example, as shown in FIG. 8, if the cover 29 of the inner lid is inserted into the inner cover and bolted from the upper outer side of the partition 25, the internal pressure is increased. Even if added, the cover 29 does not come off the partition 25 and is safe.

  As described above, according to the invention of the present embodiment, the upper part of the partition surrounding the pressure release plate on the ceiling of the switchgear arranged on the panel is closed by the cover, and the openings are formed on both wall surfaces of the panel in the panel direction. Since the high temperature gas generated by an internal accident is ejected by pushing open the pressure relief plate, it is completely prevented from leaking from the upper part of the partition to the outside, and the gas can be released from the side opening. It is possible to provide a switchgear that prevents gas from entering the maintenance space around the switchgear and does not affect the operator.

It is side surface sectional drawing of the switchgear by Embodiment 1 of this invention. It is a perspective view of the switchgear by Embodiment 1 of this invention. It is a figure which shows the flow of the gas ejected at the time of an accident in FIG. FIG. 2 is a perspective view in which switch gears of FIG. 1 are arranged in a row. It is a perspective view of the switchgear by Embodiment 2 of this invention. It is the top view and side view of a switchgear by Embodiment 3 of this invention. It is the perspective view and principal part front view of a switchgear by Embodiment 4 of this invention. It is principal part sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 1a Ceiling part 2 Carriage 3 Circuit breaker 4 Circuit breaker compartment 5a, 5b Disconnection part 6a, 6b Main circuit terminal 7 Controller compartment 8 Bus 9 Supporting insulator 10 Bus compartment 11 Branch bus 12 Cable 13 Cable compartment 14 Load side conductor DESCRIPTION OF SYMBOLS 15 Current transformer 16 Ground switch 17 Door 18a-18c Pressure release plate 19 Partition 21a-21c Distribution board 22a-22c Pressure release plate 23, 24, 25 Partition 24a Inclination part 26, 29 Cover 27 Opening part 28 Duct.

Claims (4)

In the switchgear in which the inside of the housing is partitioned into a plurality of compartments, and the pressure relief plate that is opened by the abnormal pressure in the compartment is provided on the ceiling portion of the housing that communicates with the compartment in which the main circuit components are stored.
A switchgear characterized in that a partition for enclosing the pressure relief plate is erected on the outer periphery of the ceiling portion. A plurality of rows of switchboards in which the inside of the housing is partitioned into a plurality of compartments and the pressure relief plates that are opened by the abnormal pressure in the compartment are provided on the ceiling of the housing that communicates with the compartment in which the main circuit components are stored. In switchgear arranged on the panel,
A switchgear characterized in that a partition for enclosing the entire pressure release plate of the plurality of switchboards is erected on the outer periphery of the entire ceiling portion of the plurality of switchboards.   The switchgear according to claim 1 or 2, wherein an inclined portion that is inclined inward is formed on the entire circumference of the upper side of the partition.   3. The switchgear according to claim 2, wherein an upper portion of the partition is closed by a cover, and openings are formed on both wall surfaces of the partition in the row direction.

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