JP2019134541A - Closed type switchboard - Google Patents

Abstract

To provide a closed type switchboard that can easily detect a bus bar voltage and attach a short-circuit grounding device to shorten a power failure time due to power failure work.CONSTITUTION: The closed type switchboard includes: an electrical equipment storage chamber 15 for storing drawer-type electrical equipment 22a, 22b disposed opposite open and close doors 11a, 11b; a cable chamber 18 including a main busbar storage portion 17 that stores a main busbar connected to the opposite side of the open and close doors of the electrical equipment storage chamber; a housing 12 that closes a surface other than the open and close doors; and a work window 41 formed on a side surface of the housing facing the main busbar storage portion and an open and close lid 42 for closing the work window.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a closed type switchboard that houses electrical equipment that can move forward and backward with respect to a bus.

In special high-voltage or high-voltage closed type switchboards, the drawer type electrical equipment is housed in a case that is closed on all but one side, and the main circuit terminal of this type of drawer type electrical equipment is connected to the busbar to supply power. The power between the power supply side and the load side can be cut off.
In such a closed type switchboard, when performing an inspection work, a power failure work on the corresponding panel or the corresponding panel is required from the viewpoint of preventing an electric shock. The power outage work procedure is as follows: (1) Opening / withdrawing the high-voltage panel breaker, (2) Control power “OFF”, (3) Input power “OFF”, (4) Electricity detection, and installation of short-circuit grounding equipment Like to do.
For the purpose of simplifying these operations, for example, in the prior art described in Patent Document 1, a partition wall is provided in the crossover wiring on the high voltage power supply side, and an opening window is provided in the partition wall to improve workability.

JP-A-6-253424

By the way, in the high-voltage closed type switchboard, the power failure operation is performed in the above-described procedures (1) to (4) in all the high-voltage panel rows or the single high-voltage panel. Among these, the opening / drawing of the high-voltage panel breaker (1) has a structure in which the front door of the closed type switchboard is opened and the circuit breaker is pulled out by a dedicated jig, and can be easily operated. The control power source “OFF” in (2) and the ON power source “OFF” in (3) can be easily operated by operating a switch on the front of the closed type switchboard.
However, with regard to the work of attaching the short-circuit grounding device to the bus bar after the voltage detection in (4), the bus bar is in a position isolated by the partition wall in the closed type switchboard, and the live parts are exposed (risk of electric shock). It is not a structure that can be easily opened in terms of For this reason, it is not easy to detect electric power and attach a short-circuit grounding device.

  Conventionally, in order to detect the bus bar and install a short-circuit grounding device, the back of the closed switchboard is opened, an operator puts the body between the busbars, the bolts are removed, and the bulkhead in the closed switchboard is removed. There was a need. However, in general, the inside of a high voltage closed type switchboard is as narrow as about 800 mm, and since it is not structured to allow an operator to enter it, workability is poor and power outage work takes time (1 Time attitude). Further, many of the high-voltage closed type plate panels have a secondary main cable wired on the back side, and the workability is further poor, and there are cases where it takes more time to remove the partition wall (about 2 hours). Since this work occurs at the time of power outage work and at the time of power outage cancellation, this work occupies a total of about 4 hours out of the power outage that imposes operational restrictions (decrease in production).

For such a problem, for example, in the prior art described in Patent Document 1, a partition is provided in the crossover wiring on the high-voltage power supply side, and an opening window is provided in the partition to improve workability. Work that narrows the work space by adding members such as partition walls to the closed type switchboard, and can easily cause an electric shock accident due to erroneous opening and closing of outsiders by simplifying the removal and installation of the lid on the opening and closing window There is a problem that harms sex.
Therefore, the present invention has been made paying attention to the problems of the prior art described above, and is a closure that can easily detect a bus bar and attach a short-circuit grounding device to shorten a power failure time due to a power failure operation. The purpose is to provide a type switchboard.

  In order to solve the above-described problems, an embodiment of a closed type switchboard according to the present invention includes an electrical device storage chamber that houses a drawer-type electrical device disposed to face an opening / closing door, and an opening / closing door of the electrical device storage chamber. Is formed on the side of the housing facing the main bus housing portion, the cable chamber including the main bus housing portion for housing the main bus connected to the opposite side, the housing for closing the surface other than the open / close door. A working window and an opening / closing lid for closing the working window.

  According to one aspect of the present invention, since the working window and the closing lid that closes the working window are provided opposite to the main bus housing portion, the opening to the open / close lid at the time of a power failure operation can be performed directly on the main bus. Electricity detection work and short-circuit grounding equipment can be attached, and the work time can be shortened to reduce the production cut-off time.

It is a front view of the closed type switchboard which concerns on this invention. It is a right view of FIG. It is sectional drawing on the III-III line of FIG. 1 which shows the internal structure of a closed type switchboard. It is sectional drawing on the IV-IV line of FIG. 2 which shows the internal structure of a closed type switchboard.

  Hereinafter, an embodiment of a closed type switchboard according to the present invention will be described with reference to the drawings. Each drawing is schematic and may be different from the actual one. Further, the following embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the configuration is not specified as follows. That is, the technical idea of the present invention can be variously modified within the technical scope described in the claims.

As shown in FIG. 1, a high-voltage or extra high-voltage closed type switchboard 10 according to the present invention has two doors 11a and 11b with two upper and lower interlocks on the front, and two upper and lower interlocks on the back. A housing 12 having open / close doors 11c and 11d is provided. On the open / close doors 11a and 11b, operation switches 13a and 13b for turning off and on the control power source and the on power source are arranged. Further, the housing 12 is formed with three pressure release ports 14 that can be opened and closed on the upper surface.
Inside the housing 12, an electrical device storage chamber 15 is formed on the front side, and a cable chamber 18 including a main bus storage portion 17 is formed on the back side of the electrical device storage chamber 15 via a partition wall 16. .

In the electrical equipment storage chamber 15, cradles 21a and 21b are formed in two upper and lower stages facing the open / close doors 11a and 11b, and drawer type circuit breakers 22a and 22b as drawer type electrical equipment are respectively provided in the cradle 21a and 21b. It is stored so that it can be removed from the front side.
The partition wall 16 has upper and lower power supply side main circuit terminals 23a and 23b and load side main circuit terminals 24a and 24b which are electrically connected when the drawer type circuit breakers 22a and 22b are arranged in the cradle 21a and 21b. It is arranged to penetrate. Three of these power supply side main circuit terminals 23a, 23b and load side main circuit terminals 24a, 24b are arranged in parallel in the left-right direction.

The upper power supply side main circuit terminal 23a and the lower power supply side main circuit terminal 23b are connected by a power supply side branch conductor 25 formed of a bus bar, and the power supply side branch conductor 25 is formed of a bus bar. The main buses 26R, 26S and 26T are individually connected. The main buses 26R, 26S, and 26T are individually supported through three levers 27R, 27S, and 27T that extend in the left-right direction with a predetermined interval in the vertical direction.
These power supply side main circuit terminals 23a and 23b, the power supply side branch conductor 25 and the main bus bars 26r to 26t are surrounded by a partition plate 29 to form a main bus bar accommodating portion 17. The partition plate 29 is formed in a U shape by an upper surface plate portion 29a, a back surface plate portion 29b, and a lower surface plate portion 29c. The front ends of the upper surface plate portion 29a and the lower surface plate portion 28c are fixed to the partition wall 16, and the left and right end portions of the upper surface plate portion 29a, the back surface plate portion 29b, and the lower surface plate portion 29c are connected to the left and right side plates 12a and 12b of the housing 12. It is fixed.

In the cable chamber 18, an instrument current transformer 32a connected to the load side main circuit terminal 24a via a load side branch conductor 31a constituted by a bus bar is disposed, and the output side of the instrument current transformer 32a is connected to the housing. It is connected to the cable terminal 33a supported on the upper surface plate part 12c of the body 12 via a lever.
Similarly, an instrument current transformer 32b connected to the load side main circuit terminal 24b via a load side branch conductor 31b constituted by a bus bar is disposed, and the output side of the instrument current transformer 32b is connected to the housing 12. The intermediate plate 12d is connected to a cable terminal 33b supported via an insulator.

As shown in FIG. 4, the cable terminals 33a and 33b have three-phase terminals R, S and T, respectively, and three-phase load cables 34R and 34S are connected to the terminals R, S and T of the lower cable terminal 33b. And 34T are connected, and the other ends of these load cables 34R, 34S and 34T are connected to the cable head 35, and are further drawn out through the zero-phase current transformer 36.
On the other hand, a work window 41 is opened on the right side plate 12b of the housing 12 at a position in the partition plate 29 facing the main buses 26R, 26S, and 26T stored in the main bus bar storage portion 17. A heavy opening / closing lid 42 having anti-explosive properties is attached to a side wall forming the working window 41 by a hinge 43 so as to be opened and closed. The opening / closing lid 42 is preferably provided with a locking mechanism 44 for the purpose of avoiding an accident by an outsider.

Further, a translucent resin material 45 capable of visually recognizing the main buses 26R, 26S, and 26T is disposed at the central position of the opening / closing lid 42.
The translucent resin material 45 has a breaking strength and is formed in a square plate shape by applying a self-extinguishing synthetic resin material that can be visually recognized from the outside. As a synthetic resin material, the present inventors have examined a material that avoids destruction and scattering and loss of combustion due to impact. As a result, a polycarbonate resin excellent in impact resistance per weight and having no self-flammability is applied.

Next, the operation of the above embodiment will be described.
During normal use of the closed type switchboard 10, the three-phase AC power input from the main buses 26R, 26S, and 26T is output to the load cables 34R, 34S, and 34T through the pull-out type circuit breakers 22a and 22b. In this normal state, the inside can be visually recognized through the translucent resin material 45 of the opening / closing lid 42 provided on the right side plate 12b of the housing 12. For this reason, signs of abnormality such as loose connection and tracking of the main buses 26R to 26T can be monitored.
When work is performed in the closed type switchboard 10 from this normal use state, a power failure work is performed from the viewpoint of electric shock prevention. In this power failure operation, first, the operation switches 13a and 13b of the doors 11a and 11b are operated, then the doors 11a and 11b are opened, and the drawer type circuit breakers 22a and 22b are pulled out using a dedicated jig. The power supply side main circuit terminals 23a and 23b and the load side main circuit terminals 24a and 24b arranged in FIG.

Next, the operation switches 13a and 13b are operated to switch the control power source to “OFF”, and then switch the ON power source to “OFF”.
Next, after turning to the right side of the housing 12 to unlock the opening / closing lid 42, the opening / closing lid 42 is opened. Thereby, it is possible to make direct contact with the main buses 26R to 26T and the power supply side branch conductor 25 arranged at predetermined intervals in the vertical direction in the main bus housing part 17 surrounded by the partition plate 29 from the opening / closing lid 42. It becomes. For this reason, voltage detection can be performed on each of the main buses 26R to 26T or the power supply side branch conductor 25. After the voltage detection is completed, a short-circuit grounding device can be attached to the main buses 26R to 26T or the power supply side branch conductor 25.

Thereafter, when performing the power failure release operation, the short-circuit grounding device is removed from the main buses 26R to 26T or the power supply side branch conductor 25 in the reverse procedure to the power failure operation, and the open / close lid 42 is closed to close the work window 41. Then lock it.
Next, the operation switches 13a and 13b are operated to switch the input power source to “ON” and the control power source to “ON”, and then push the drawer type circuit breakers 22a and 22b into the cradle 21a and 21b to supply the main circuit terminal on the power source side. 23a, 23b and load side main circuit terminals 24a, 24b are electrically connected.
Then, the doors 11a and 11b are closed and locked.

  As described above, according to the above-described embodiment, the work in the main bus accommodating part 17 that takes time for the power outage work and the power outage release work only opens the open / close lid 42, and the main buses 26R to 26T and the power supply side branch conductor 25 are connected. It can be exposed and the working time can be greatly shortened. That is, in the prior art, workability for workers to enter is poor, and it takes about 1 hour to reach the main bus storage part, and it takes about 2 hours to remove the partition surrounding the main bus storage part. In the embodiment, it is only necessary to open the opening / closing lid 42, and the time required for opening and closing each is about 15 minutes, and the total time is about 30 minutes, and the work of about 4 hours is completed in about 0.5 hours. Can do. Therefore, it is possible to exert a great effect on reducing the power failure time (production reduction time).

Further, by opening and closing the opening / closing lid 42 using the hinge 43, it is possible to smoothly open and close even the heavy opening / closing lid 42 for explosion resistance, and only a grounding space of the size of the opening / closing lid 42 is required. It can be applied to a closed type switchboard.
By the way, it is conceivable that the opening / closing lid 42 can be removed by screwing, but the tool is opened and closed by using a screwdriver or the like for screwing or screw removal, and the tool is dropped into the closed type switchboard. A case is envisaged, which has the problem that it can also cause a short circuit of the wiring in the closed type switchboard and an electric shock. Therefore, an opening / closing mechanism that does not use a detachable part or tool is desired.

For this reason, it is conceivable that a sash is provided on the opening / closing lid 42 to make it slidable, but if the structure is such that the opening / closing lid 42 itself does not fall while ensuring explosion resistance, smooth opening / closing may be impaired, Depending on the shape, there is a problem that the space for the sliding of the lid cannot be secured and the applicable closed type switchboard is limited.
By using the open / close lid 42 using the hinge 43 as in the present invention, all the above problems can be solved.
Further, by providing the locking mechanism 44 on the opening / closing lid 42, it is possible to avoid an unexpected accident caused by a related person or the like.

Furthermore, by arranging a translucent resin material 45 that can visually recognize the inside of the opening / closing lid 42, the inside can be visually recognized without opening the opening / closing lid 42, and loosening of the connection and the main bus and the power supply side branch conductor It can monitor for signs of abnormalities such as tracking. In addition, by applying a resin material that has anti-explosive properties, is visible, and is self-extinguishing as the translucent resin material 45, internal monitoring can be performed safely.
Incidentally, when tempered glass is used as the translucent member, it is not preferable because it is broken and scattered by impact. In addition, the meshed glass does not scatter due to impact, but breaks, so that the translucency is impaired and can cause cuts. Further, when acrylic is used, it is not preferable because it ignites at a high temperature and self-fires. As the self-extinguishing resin material, polycarbonate, phenol resin, and polyvinyl chloride can be used, and among them, polycarbonate is preferable because of its excellent transparency and impact resistance.

In the present embodiment, the main bus bars 26R to 26T are disposed in the main bus accommodating portion 17 with a predetermined interval in the vertical direction, so that the work window 41 and the opening / closing lid 42 can also be vertically long, Opening and closing can be easily performed with less applied load.
In addition, in the said embodiment, although the case where the locking mechanism 44 was provided in the opening-and-closing lid 42 was demonstrated, it is not limited to this, The closed type switchboard 10 is installed in the place where an outsider does not enter. In some cases, the locking mechanism 44 can be omitted.
In the above embodiment, the case where the opening / closing lid 42 is opened / closed by the hinge 43 has been described. However, the present invention is not limited to this, and the opening / closing lid 42 is fitted to the sash in a large-sized closed-type switchboard with sufficient side dimensions. It is also possible to provide a slide-type opening / closing lid having a structure that cannot be removed from the sash.

Furthermore, although the case where the translucent resin material 45 is disposed on the opening / closing lid 42 has been described in the above embodiment, the present invention is not limited to this, and the translucent resin material 45 may be omitted. .
Moreover, in the said embodiment, although the case where main bus-line 26R-26T was arrange | positioned in parallel with the up-down direction was demonstrated, it is not limited to this, A main bus-line can also be arrange | positioned in parallel in the front-back direction. In this case, the open / close lid 42 may be formed horizontally long in accordance with the arrangement of the main bus bars.

  DESCRIPTION OF SYMBOLS 10 ... Closed type switchboard, 11a, 11b, 11c, 11d ... Open / close door, 12 ... Housing, 13a, 13b ... Operation switch, 15 ... Electrical equipment storage room, 16 ... Bulkhead, 17 ... Main bus storage part, 18 ... Cable Chamber, 21a, 21b ... Cradle, 22a, 22b ... Drawer type circuit breaker, 23a, 23b ... Power supply side main circuit terminal, 24a, 24b ... Load side main circuit terminal, 25 ... Power supply side branch conductor, 26R-26T ... Main bus 31a, 31b ... load-side branch conductors, 32a, 32b ... current transformers for instruments, 34R to 34T ... load cables, 35 ... cable heads, 36 ... zero-phase current transformers, 41 ... work windows, 42 ... open / close lids 43 ... Hinge, 44 ... Locking mechanism, 45 ... Translucent resin material

Claims (4)

An electrical equipment storage room for storing a drawer-type electrical equipment disposed facing the open / close door;
A cable room including a main bus storage part for storing a main bus connected to the opposite side of the electrical equipment storage room from the open / close door;
A housing that closes a surface other than the door;
A closed type switchboard comprising: a work window formed on a side surface of the housing facing the main bus housing portion; and an open / close lid that closes the work window.   The closed switchboard according to claim 1, wherein the opening / closing lid is attached to a side wall forming the work window of the housing via a hinge.   The closed switchboard according to claim 1 or 2, wherein the opening / closing lid is configured to be lockable.   The closed type switchboard according to any one of claims 1 to 3, wherein a resin material that can visually recognize the inside and is self-extinguishing is disposed in a part of the opening / closing lid.

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