JP2016001946A - Metal closed type switch gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal closed type switch gear allowing visual inspection of a main circuit section disposed on a rear surface to be easily performed.SOLUTION: A metal closed type switch gear comprises: a box body 1; a rear surface door 3 provided to a rear surface of the box body 1; first metallic protection plates 4a and 4b provided at an inside of the rear surface door 3; a plurality of first through-holes 7a and 7b being provided in the first protection plates 4a and 4b and being staggered; metallic second protection plates 6a and 6b caused to overlap with the first protection plates 4a and 4b in a movable manner; and a plurality of second through-holes 8a and 8b being provided in the second protection plates 6a and 6b and being disposed similarly to the first through-holes 7a and 7. The first through-holes 7a and 7b and the second through-holes 8a and 8b are closed in normal time. The second protection plates 6a and 6b are moved to coincide the first through-holes 7a and 7b and the second through-holes 8a and 8b with one another in inspection time.

Description

  Embodiments of the present invention relate to a metal closed switchgear that can facilitate visual inspection and maintenance.

  Conventionally, a metal closed switchgear has been provided with a front door and a rear door in the front-rear direction of the box. Each door is opened, and on the front side, control circuits such as measuring instruments and protection relays, the rear On the side, maintenance and inspection of main circuit parts such as buses and power cables are performed (for example, see Patent Document 1).

  However, on the rear side, there is a type in which a protective plate is further provided inside the door so that the main circuit portion cannot be directly touched even when the rear door is opened. This is based on the principle that maintenance and inspection is basically performed in the state of power failure. After the power failure, the protective plate is removed. On the front side, maintenance and inspection can be performed without a power failure (see, for example, Patent Document 2).

  Here, during daily inspections, there are many users who want visual inspections such as foreign matter adhesion and discoloration on the main circuit part, and it is not practical to make a power failure each time. It may be made of an insulating resin. However, the protective plate is preferably made of metal from the viewpoints of fixing the ground potential and preventing melting damage. From these things, what can perform the visual inspection of a main circuit part easily even if it uses a metal protection board was desired.

JP 2008-283734 A JP-A-6-253416

  The problem to be solved by the present invention is to provide a metal closed type switchgear that can easily perform visual inspection of a main circuit portion even when a rear protective plate is made of metal.

  In order to solve the above-described problems, a metal closed switchgear according to an embodiment includes a box, a back door provided on the back of the box, and a metal first provided on the inside of the back door. A protective plate, a plurality of first through holes provided in a staggered manner provided on the first protective plate, and a metal second protection movably superimposed on the first protective plate A plate and a plurality of second through holes arranged in a staggered manner similar to the first through hole and provided in the second protective plate, and at the normal time, the first through hole and The second through hole is closed, and at the time of inspection, the second protective plate is moved so that the first through hole and the second through hole coincide with each other.

The perspective view which shows the structure of the metal closed type switchgear which concerns on Example 1 of this invention. The figure explaining the movement of the protection plate of the metal closed type switchgear which concerns on Example 1 of this invention. The perspective view which shows the protection board of the metal closed type switchgear which concerns on Example 2 of this invention. The perspective view which shows the protective plate of the metal closed type switchgear which concerns on Example 3 of this invention. The perspective view which shows the structure of the metal closed type switchgear which concerns on Example 4 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, a metal closed switchgear according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a configuration of a metal closed switchgear according to a first embodiment of the present invention, and FIG. 2 is a diagram illustrating movement of a protective plate of the metal closed switchgear according to the first embodiment of the present invention. It is.

  As shown in FIG. 1, the box 1 is provided with a front door 2 that can be opened and closed on the front side, and a rear door 3 that can be opened and closed on the back side. The box 1 is stacked in two stages. Inside the back door 3, first and second metal plate-like first protection plates 4 a and 4 b are fixed to the box body 1 with bolts (not shown). A pair of guide rails 5a and 5b, which are U-shaped in cross section and face the inside, are laterally arranged and fixed to the upper and lower portions of the first protective plates 4a and 4b. The guide rails 5a and 5b are provided with metal-made plate-like second protection plates 6a and 6b so as to be movable.

  In the first protective plates 4a and 4b, a plurality of rectangular first through holes 7a and 7b (indicated by dotted lines) are arranged in a staggered manner in a plurality of rows. A plurality of rectangular second through holes 8a and 8b (indicated by solid lines) are also arranged in a staggered manner in the second protective plates 6a and 6b. The first through holes 7a and 7b and the second through holes 8a and 8b have the same shape and the same arrangement.

  At the left end of the second protective plates 6a and 6b, the second protective plates 6a and 6b are moved along the guide rails 5a and 5b, and springs 9a and 9b biased so as to be pulled leftward. Knobs 10a and 10b are provided. The first protective plates 4a and 4b are provided with handles 11a and 11b for carrying at both ends. Limit switches 12a and 12b are provided at a stop position indicated by a two-dot chain line that stops by moving the second protective plates 6a and 6b to the right. The limit switches 12a and 12b are connected to a display device, an alarm device, and the like that indicate that the second protective plates 6a and 6b have been moved.

  The box 1 contains a control circuit unit such as a measuring instrument and a protection relay on the front side, and a busbar inside the first protection plates 4a and 4b and the second protection plates 6a and 6b on the back side. A main circuit section such as a power cable is accommodated.

  Next, the positional relationship between the first through holes 7a and 7b and the second through holes 8a and 8b will be described with reference to FIG. In addition, since the upper stage and lower stage of a two-stage stack | stack are the same structures, it demonstrates using an upper stage.

  FIG. 2 (a) shows a normal operation state, where the first through hole 7a of the first protective plate 4a and the second through hole 8a of the second protective plate 6a are as shown in the figure. In the staggered arrangement, the pitch is shifted by ½ pitch, and the through holes 7a and 8a are closed. The first through hole 7a is closed at a portion where the second through hole 8a of the second protective plate 6a is not provided, and the second through hole 8a is closed at a portion where the first through hole 7a of the first protective plate 6a is not provided. The inside cannot be visually observed. This state is always maintained by the spring 9a. One pitch indicates the interval between the through holes 7a (8a) arranged in a straight line.

  In the case of visual inspection, as shown in FIG. 2B, the knob 10a is operated, and the second protective plate 6a is moved to the right by 1/2 pitch along the guide rail 5a. Then, the positions of the first through hole 7a and the second through hole 8a coincide with each other, and the inside can be visually observed through the opened first and second through holes 7a and 8a. Although the opening area is a spotted pattern and viewing is restricted, it is possible to confirm the degree of foreign matter adhesion and discoloration on the main circuit portion. This can be performed even in the driving state, and a display or warning during driving can be issued by the limit switch 12a. As a matter of course, the second protective plate 6a can be moved even in a power failure state.

  Here, the size of the first and second through holes 7a and 8a is preferably in conformity with the standard of JEM-1425, for example. If the protection class conforms to IP2, the length in the long side direction of the rectangular shape is set to 12.5 mm or less. The first and second through holes 7a and 8a are not limited to a rectangular shape, but may be a circular shape, an elliptical shape, a polygonal shape, or the like. The protection class can correspond to IP1 to IP4, but IP2 is preferable in consideration of visual inspection.

  Thereby, even during operation, the inside can be visually inspected by moving the second protective plate 6a and matching the positions of the first through hole 7a and the second through hole 8a. become. Further, since the first protective plate 4a and the second protective plate 6a are made of metal, they can be fixed to the ground potential, and can prevent melting damage during discharge.

  According to the metal closed switchgear of the first embodiment, a plurality of first through holes 7a arranged in a staggered manner are provided in the metal first protective plate 4a that protects the main circuit portion, and the first through holes 7a are provided in the first protective plate 4a. The metal second protective plate 6a provided with the second through-hole 8a having the same shape as the through-hole 7a is overlapped, and the through-holes 7a and 8a are always closed, and at the time of inspection The second protective plate 6a is horizontally moved by ½ pitch so that the through holes 7a and 8a coincide with each other, so that the inside of the box 1 is visually inspected without removing the first protective plate 4a. can do. This can be performed even in an operating state, and daily inspections can be easily and accurately performed.

  In the said Example 1, although the box body 1 was demonstrated by two-stage stacking, it can be used for the multistage stacking of two or more stages, and a single board.

  Next, a metal closed switchgear according to a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a perspective view showing the protective plate of the metal closed switchgear according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in that the movement of the second protective plate is in the vertical direction. In FIG. 3, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The protection plate will be described using the upper stage.

  As shown in FIG. 3, a pair of guide rails 5a are vertically arranged and fixed to the first protective plate 4a. On the second protective plate 6a, a knob 10a is provided at the top. When the second protective plate 6a is lowered, both the first through hole 7a and the second through hole 8a are closed, and when the second protective plate 6a is lifted, the first through hole 7a The second through holes 8a are matched. For this reason, the spring 9a of Example 1 becomes unnecessary.

  According to the metal closed switchgear of the second embodiment, the same effect as that of the first embodiment can be obtained.

  Next, a metal closed switchgear according to a third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a perspective view showing the protective plate of the metal closed switchgear according to the third embodiment of the present invention. The third embodiment is different from the first embodiment in that the movement of the protective plate is the rotational direction. In FIG. 4, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The protection plate will be described using the upper stage.

  As shown in FIG. 4, the first protective plate 4a is provided with an arcuate guide rail 13a at the top and a rotatable fixing pin 14a at the bottom. The first through holes 7a are arranged radially with the fixing pin 14a as the center. The 2nd protection board 6a is formed in fan shape, and the through-hole 15a which the fixing pin 14a penetrates is provided in the lower part. The second through holes 8a are arranged radially like the first through holes 7a. Then, the second protective plate 6a is rotated around the fixing pin 14a.

  According to the metal closed switchgear of the third embodiment, the same effect as that of the first embodiment can be obtained.

  Next, a metal closed switchgear according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 5 is a perspective view showing a configuration of a metal closed switchgear according to a fourth embodiment of the present invention. The fourth embodiment differs from the first embodiment in that the back surface is a hook protection plate. In FIG. 5, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, the rear door of the box 1 does not have a rear door as in the first embodiment, and the hook protection plates 16 a and 16 b are fixed by bolts 17 a and 17 b. A pair of guide rails 5a and 5b are fixed to the hook protection plates 16a and 16b, and the second protection plates 6a and 6b can move freely. When the hook protection plates 16a and 16b are removed, the main circuit portion can be directly visually observed.

  According to the metal closed switchgear of the fifth embodiment, the same effect as that of the first embodiment can be obtained even when the hook protection plates 16a and 16b are provided on the back surface.

  According to the embodiment as described above, the plurality of second through holes arranged in a staggered manner are provided on the first protective plate provided with the plurality of first through holes arranged in a staggered manner. The provided second protection plate is movably overlapped and placed, and normally the first through hole and the second through hole are closed, and at the time of inspection, the second protection plate is moved to move the first through hole. Since the hole and the second through hole are made to coincide, visual inspection can be facilitated.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Box 2 Front door 3 Rear door 4a, 4b 1st protection board 6a, 6b 2nd protection board 7a, 7b 1st through-hole 8a, 8b 2nd through-hole 16a, 16b 1st hook protection Board

Claims (5)

Box and
A back door provided on the back of the box;
A metal first protective plate provided inside the back door;
A plurality of first through holes provided in the first protective plate and arranged in a staggered manner;
A metal second protective plate movably superimposed on the first protective plate;
A plurality of second through holes provided in the second protective plate and arranged in a staggered manner similar to the first through holes,
Normally, the first through hole and the second through hole are closed,
At the time of inspection, the second protective plate is moved so that the first through hole and the second through hole are aligned with each other.   2. The metal closed switchgear according to claim 1, wherein a laterally arranged guide rail is provided on the first protective plate, and the second protective plate is moved in the left-right direction.   2. The metal closed switchgear according to claim 1, wherein the first protective plate is provided with a vertically arranged guide rail, and the second protective plate is moved in the vertical direction.   The metal closed switchgear according to claim 1, wherein an arc-shaped guide rail is provided on the first protection plate, and the second protection plate is rotated. Box and
A metal hook protection plate provided on the back of the box,
A plurality of first through holes provided in the hook protection plate and arranged in a staggered manner;
A second metal protection plate movably superimposed on the hook protection plate;
A plurality of second through holes provided in the second protective plate and arranged in a staggered manner similar to the first through holes,
Normally, the first through hole and the second through hole are closed,
At the time of inspection, the second protective plate is moved so that the first through hole and the second through hole are aligned with each other.