JPH10336815A - Low-tension distribution board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a low-tension distribution board capable of securing a wide connection space for wiring to molded-case circuit breakers. SOLUTION: In this low-tension distribution board 10, protection covers 74, 76, which covers a bus unit 30 and molded-case circuit breakers(MCCB) 50 fixed on a base plate 26, are supported in a rotatable manner with a hinged part 86 provided on a ventilating cover 70 and cosmetic covers 94, 96, 98 are attached to a frame 16. This structure enables the cosmetic and protection covers to rotate to be opened, leaving a large space between the bus unit 30 and frame 16 and thereby making it easy to mount or dismount the MCCBs and to connect the wirings to the MCCBs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-voltage switchboard for branching and supplying low-voltage power supplied from a main line to each load via a circuit breaker.

[0002]

2. Description of the Related Art In general, a predetermined low-voltage power is supplied to a lighting equipment or a low-voltage power equipment from a lighting distribution board or a power distribution board. The electric light distribution board and the power distribution board are connected to the low-voltage switchboard as load equipment, and power obtained by converting high-voltage power to low-voltage power is supplied from the low-voltage switchboard. Electrical equipment for converting high-voltage power to low-voltage power and supplying it to each load includes a power receiving panel that receives high-voltage power, and a high-voltage power that is received by the power receiving panel. It is equipped with a transformer board that includes a transformer that converts voltage into electric power, and a low-voltage switchboard that branches and supplies the transformed low voltage to each load facility.The low-voltage switchboard supplies three-phase power to the power load There is a power switchboard for powering, and a light switchboard for supplying single-phase power to the light load, and the transformed power of a predetermined voltage is
The electric power is supplied to a load corresponding to each electric power via a power switchboard or a light switchboard.

For example, a power distribution board is provided with a circuit breaker corresponding to a load capacity, for example, for each power facility, and low-voltage power is supplied through electric wiring connected to the wiring breaker. It has become.

For example, in a low-voltage switchboard provided with a large number of circuit breakers, a bus is arranged vertically in the center of the box, and the circuit breakers are arranged on both sides of the bus. The primary side (power supply side) of each of the circuit breakers is attached to the bus. Further, an electric wiring connected to each load is connected to a secondary side (load side) opposite to the bus bar of each wiring breaker. That is, electric wiring such as a cable connected to the circuit breaker is also drawn into the box body of the low-voltage switchboard.

[0005] Such a circuit breaker according to the load capacity is mounted, and when the load is changed, it is necessary to replace the circuit breaker with a wiring breaker according to the changed load. . Further, it is necessary to use a cable corresponding to the load capacity, and a cable having a capacity corresponding to the breaking capacity of the wiring breaker is used.

[0006] In the low-voltage switchboard, the charging section is concealed by a protective cover that exposes only the operation knob of the circuit breaker for wiring. Such a protective cover,
In some cases, a hinge is provided on one end side, and a bus bar or a circuit breaker for wiring is opened by rotating the hinge around the hinge. Further, the periphery of the protective cover or the entire surface including the protective cover is covered by a panel which is opened and closed like a door.

When attaching a circuit breaker to such a low-voltage switchboard or connecting a cable to the circuit breaker, after opening the entire panel, remove the protective cover or rotate around the hinge. Let it. As a result, the wiring breaker is opened together with the bus bar.

[0008]

However, when the protective cover or panel is opened, only the vicinity of the bus is opened, and the protective cover, panel, or a frame for supporting the cable is connected to the circuit breaker for wiring. It remains at one end to be connected and narrows the work space, which hinders not only the connection and disconnection of the cable but also the replacement of the wiring breaker. In order to secure a sufficient working space with the protective cover and the panel left, the box constituting the low-voltage switchboard becomes large.

For this reason, in order to secure a sufficient working space to replace the circuit breaker or connect a cable to the circuit breaker, it is necessary to remove the protective cover and panel from the box. The work becomes complicated.

The present invention has been made in view of the above-mentioned facts, and allows easy installation of a circuit breaker and the like.
An object of the present invention is to provide a low-voltage switchboard in which a work space for connecting electric wiring to a circuit breaker is sufficiently ensured.

[0011]

The invention according to claim 1 is
A base plate having a set of bus bars extending therethrough and wiring breakers mounted on both sides of the bus bar, and a base plate of the base plate and a mounting surface of the wiring breakers facing open. A box body for housing the base plate, a pair of protective covers that are divided across the bus bar to cover the base plate-shaped bus bar and the circuit breaker, and along a longitudinal direction of the bus bar. A hinge portion provided on both sides for rotatably supporting each of the pair of protective covers, and a hinge portion rotatably mounted around a hinge provided on an opening peripheral edge of the box, and an upper surface of the base plate; And a panel covering the periphery of the opening.

According to the present invention, the protective cover is mounted so as to rotate about a bus bar provided along the vertical direction at the center of the box body. Panels are attached to the periphery of the box and the periphery of the protective cover so as to rotate about the periphery of the box.

Therefore, by opening the protective cover and the panel, the wiring breaker and the space for connecting the electric wiring to the wiring breaker can be largely opened, and the connection of the electric wiring to the wiring breaker can be facilitated. Becomes

According to a second aspect of the present invention, the bus bar includes a plate-like electrode in which electrodes of each phase of low-voltage power are formed in a plate-like shape and held at predetermined intervals. Each of the plate-like electrodes is sandwiched and connected by pushing a base plate toward the bus bar portion by a container.

According to the present invention, the plug-in system is such that the wiring breaker is connected to the bus by pushing the wiring breaker toward the wire keeping section. This facilitates mounting or replacement of the circuit breaker even if the protective cover is located at a position facing the bus bar.

According to a third aspect of the present invention, the hinge portion includes:
A ventilation cover disposed opposite to both ends in the longitudinal direction of the bus bar portion and covering the charging portion and having a plurality of ventilation holes; and a pivot supporting the ventilation cover and each of the pair of protection covers. Means.

According to the present invention, the charged portions at the upper end and the lower end of the bus bar are covered with the ventilation cover, and the protection cover is pivotally supported by the pivoting means provided on the ventilation cover. Since the bus portion generates a considerable amount of heat due to the current flowing to the wiring breaker, a ventilation hole is provided in the cover that covers the charged portion to radiate heat.
By providing the support means on the ventilation cover, the upper part of the protection cover can be largely opened.

[0018]

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

FIG. 1 schematically shows a power distribution system 12 using a low-voltage switchboard 10 applied to the present embodiment. The power distribution system 12 includes a high-voltage power distribution panel 14 and a plurality of low-voltage distribution panels 10A, 10B, 10C, 10D, 1
OE (hereinafter referred to as "low-voltage switchboard 10"). The high-voltage receiving board 14 houses equipment necessary for receiving high-voltage voltage.

The low-voltage switchboard 10 includes a plurality of light switchboards for supplying single-phase power to light load equipment such as a light switchboard to which a light load is connected, and a power switchboard to which a power load is connected. There are multiple power distribution boards for supplying three-phase power to the power load equipment. The low-voltage switchboard 10 includes:
The power received by the high-voltage receiving board 14 is converted to a predetermined low-voltage power (three-phase power or single-phase power) by a transformer (not shown).
Is supplied and converted. These transformers are provided on the back side of the low-voltage switchboard 10 (on the back side of the paper of FIG. 1).

As shown in FIG. 2 and FIG. 3, the low-voltage switchboard 10 has a rectangular frame 16 (see FIG. 3) whose front and back surfaces are largely open, and is mounted on a gantry 18. The exterior panel 20A is attached to the upper surface of the frame 16, and the exterior panel 20B is attachable to the side surface. Further, instead of the exterior panel 20B, a frame (not shown) of the low-voltage switchboard 10 or the high-voltage switchboard 14 of the low-voltage switchboard 10 constituting the switchboard system 12 can be connected to the side surface of the frame 16.

The frame 16 of the low-voltage switchboard 10 can be attached with a frame 22 on the back side.
The frame 22 has an open surface on the side opposite to the frame 16 of the low-voltage switchboard 10, and a flat bar 22A or the like is formed on the low-voltage switchboard 10 side for mounting various components. I have. Inside the frame 22, a transformer for converting received high-voltage power to low-voltage power, a capacitor for improving power factor (a capacitor bank composed of a plurality of capacitors), and the like can be attached.

The frame 22 has an outer panel 2 on its upper surface.
4A is attached, and the exterior panel 2
4B, the interior of the frame 22 is opened by opening the exterior panel 24B. An exterior panel 24C can be attached to the side surface of the frame 22, and an adjacent frame 22 can be connected instead of the exterior panel 24C.

That is, the power distribution system 12 covers the upper surfaces of the frames 16 forming the low-voltage switchboard 10 and the frames 22 connected to these frames 16 with the outer panels 20A and 24A, and surrounds the outer panels. By covering with 20B, 24C and the exterior panel 24B, a space in which the frames 16, 22 are connected is integrally formed so that high-voltage wiring, low-voltage wiring and the like can be arbitrarily laid inside.

Hereinafter, the low voltage switchboard 10 used in the power distribution system 12 will be described. In the following description, the low-voltage switchboard 10 will be described as a power switchboard, but the configuration of the present invention can be used not only for a power switchboard but also for a light switchboard.

As shown in FIGS. 4 and 6, the low-voltage switchboard 10 has a base plate 26 at the center of the frame 16 as viewed from the front side. This base plate 26
The pair of support legs 28 are mounted on both sides in the left-right direction. Both ends of the pair of support legs 28 extending in the up-down direction are fixed to the frame 16, whereby the base plate 26 is attached to the frame 16.

At the center of the base plate 26, a busbar unit 30, which forms a busbar along the vertical direction, is mounted. In the following description, for example, a configuration used for a low-voltage switchboard manufactured by Square D Corp. can be applied.

As shown in FIG. 8, the bus unit 30
On the base 32 fixed to the base plate 26, strip-shaped electrodes 34R, 34S, 34T (hereinafter collectively referred to as "electrodes 34") are arranged in parallel with each other. Electrode 3
Spacers 36 and 38 are arranged between the 4R and the electrode 34S and between the electrode 34S and the electrode 34T, so that the electrodes 34R, 34S and 34T arranged in three layers are spaced apart from each other at a constant interval in parallel with each other. Being held.

A pressing channel (hereinafter, referred to as a "channel 40") having a substantially U-shaped cross section is provided on the surface side of the electrode 34R, and is provided between the channel 40 and the electrode 34R. Spacers 42 are arranged and insulated. Each of the base 32 and the spacers 36, 38, and 42 is made of an insulating resin such as a glass fiber reinforced resin, and insulates the electrode 34 reliably.

A channel 40 is also arranged on the back side of the base plate 26 (not shown). Polycarbonate pipes (not shown) having a high insulating force and penetrating through the spacers 36, 38, 42, the base 32 and the base plate 26 of the electrodes 34, respectively, are disposed between the channels 40 arranged with the base plate 26 interposed therebetween. The channel 40 on the front side and the channel 40 on the back side of the base plate 26 are connected by a screw 44 inserted into an insulating pipe (not shown).

As shown in FIG. 6, the screws 44 are attached at predetermined intervals along the longitudinal direction of the busbar unit 30, whereby the busbar unit 30 is firmly fixed to the base plate 26. The bus unit 30 may have a configuration in which a plurality of units are connected.

As shown in FIG. 8, the bus unit 30
The circuit breaker (hereinafter, referred to as “MCCB50”) connected to the busbar unit 30 side (primary side, power supply side)
Grooves 52 corresponding to each of the electrodes 34R, 34S, 34T of the busbar unit 30 are formed. Each groove 52 is formed by a pair of protrusions 54. Electrodes 56R, 56S, 56T (hereinafter collectively referred to as "electrode 56") are attached to the protruding portion 54 at predetermined positions facing each other. Each of the electrodes 56 firmly sandwiches the electrode 34 by inserting the electrode 34 of the bus bar unit 30 between the protrusions 54, whereby the bus bar unit 30
Is connected to the MCCB 50.

The base 32 of the busbar unit 30 has a deck plate shape in which substantially rectangular concave portions 32A are formed at predetermined intervals.

On the other hand, on the bottom surface of the MCCB 50, the size, length, width and width are different depending on the breaking capacity, and the groove 52 has an appropriate height (the surface of the base (A height from the top) is formed. Also, MC
On the bottom surface of the CB 50, a projection 60 facing the recess 32A is formed at a predetermined position on the busbar unit 30 side.

The MCCB 50 is configured such that the electrode 34 of the busbar unit 30 enters the protruding groove 52 when the protrusion 60 enters the recess 32A of the base 32. Therefore, the MCCB 50 is mounted at a predetermined position on the base plate 26 by the recess 32A of the base 32.

On the other hand, as shown in FIG.
6, a plurality of mounting holes 62A, 62B, 62C are formed. These mounting holes 62A to 62C are located at positions based on the recesses 32A of the base 32 and
The MCCB 50 having an arbitrary size can be reliably fixed at a predetermined position on the base plate 26.

Each of the mounting holes 62A to 62C is
The bracket 6 corresponds to the opposite side (secondary side, load side) of the bus unit 30 of the CCB 50 and is prepared in advance.
4 can be fixed using the mounting holes 62A. At this time, the legs (not shown) attached to the MCCB 50 are inserted into the attachment holes 62B, which are elongated holes, so that the MCCB 50
Is moved toward the busbar unit 30 so that the base plate 26 can be sandwiched between the leg and the leg 58 of the MCCB 50. In addition, large MCCB5
0 is provided with an eccentric cam in advance, and any method such as disposing the eccentric cam in the mounting hole 62C and rotating the MCCB 50 toward the busbar unit 30 to fix the eccentric cam may be used. Can be. In FIGS. 2 and 3 and FIGS. 5 and 6, the mounting position of the MCCB 50 is shown differently.

The MCCB 50 attached in this manner
Since the size varies depending on the breaking capacity, a blank cover 66 is attached to the secondary side. Blank cover 66
The length of the MCCB 50 (the length of the protrusion from the bus unit 30 along the surface of the base plate 26 when connected to the bus unit 30) is the same.

On the other hand, as shown in FIG.
A ventilation cover 70 is attached to 6 so as to face the upper and lower ends of the busbar unit 30.

As shown in FIG. 9, the ventilation cover 70
Has a large number of ventilation holes 72 formed in a central portion 70A formed in a rectangular shape, and the ventilation holes 72
Base plate 2 so as to face the end of the base plate at a predetermined interval.
6 protrudes. A bent portion 70B bent toward the busbar unit 30 is formed on the peripheral side of the central portion 70A, and the interval between the central portion 70A and the busbar unit 30 when viewed from the side is reduced. by this,
The gap between the end of the busbar unit 30 and the ventilation cover 70 is substantially reduced to prevent an article from entering between the ventilation cover 70 and the busbar unit 30. In FIG. 9, the ventilation cover 70 facing the lower end of the bus unit 30 is shown, and the ventilation cover 70 facing the upper end of the bus unit 60 has the same shape and is not shown.

As shown in FIG. 4, a pair of protective covers 74 and 76 are opposed to the base plate 26. The protective covers 74 and 76 are divided along substantially the center of the bus bar unit 30 so as to cover the base plate 26. The ends of the protection covers 74 and 76 on the busbar unit 30 side are opposed to the ventilation cover 70.

As shown in FIG. 9, a T-shaped notch 78 is formed at the tip of the ventilation cover 70 projecting from the base plate 26, so that a hinge base 80 facing the tip is formed. I have. A pair of protective covers 74,
The upper and lower ends 76 are inserted into the cuts 78 of the ventilation cover 70.

Further, on the inner surfaces of the protective covers 74 and 76,
A bracket 82 facing the hinge base 80 is attached, and the screws 8 inserted into the bracket 82
4 is screwed and attached to the hinge base 80. As a result, a hinge portion 86 that supports the protective covers 74 and 76 is formed.

As shown in FIG. 4, the protective cover 74,
Each of the members 76 is attached so as to be rotated around a position facing the busbar unit 30 by a hinge portion 86 provided on the ventilation cover 70.

As shown in FIGS. 3 and 5, each of the protective covers 74 and 76 has rectangular openings 88 and 90 formed in the center. The openings 88 and 90 are
When the upper surface of the base plate 26 is covered by the protective covers 74 and 76 (when the protective covers 74 and 76 are closed), the MCCB 50 connected and attached to the busbar unit 30 is attached.
Is formed at a constant width so that the longitudinal direction extends along the up-down direction so as to face the position. That is, when the protective covers 74 and 76 are closed, M
The operation handle 50A of the CCB 50 is operably protruded.

In the low-voltage switchboard 10, an MCCB 50 having a wiring capacity of 100 AF to 800 AF can be attached to one end of the bus unit 30 (the left side of the paper in FIGS. 2, 3 and 5). 74 opening 88
Has an opening width corresponding to the maximum (wiring capacity is 800 AF) MCCB 50, and the most frequently used wiring capacity is 100 AF to 250 A on the opposite side of the bus unit 30.
The MCCB 50 of F is attached, and the opening 90 of the protective cover 76 has an opening width corresponding to the MCCB 50. Also, the openings 88, 90 of the protective covers 74, 76
The blank base (blind lid) 92 is attached and closed at a position where the MCCB 50 is not attached. As a result, when the protective covers 74 and 76 are closed,
The charged portion on the base plate 26 is securely hidden.

When the protective covers 74 and 76 are closed, they are held by closing means such as a magnet attached to a predetermined position on the front surface of the frame 16, and are pulled against the urging force of the magnet. By being
The hinge 86 is rotated around the hinge 86.

On the other hand, as shown in FIGS.
Decorative panels 94 and 96 are mounted between the protective covers 74 and 76 and the peripheral edge on the front side of the frame 16.
Each of the decorative panels 94 and 96 is provided with a hinge (not shown) between the periphery of the frame 16 and a position where the protective cover 74 or 76 and the frame 16 are opened and closed by the hinge (closed position). State).

The decorative panels 98 correspond to the upper openings of the protective covers 74 and 76 and the decorative covers 94 and 96.
Is provided. This decorative panel 98 is used for the frame 1
6 and is connected to the upper peripheral edge of the frame 16 by a hinge (not shown). By pivoting about the upper end on the side of the frame 16 as an axis, as shown in FIGS. The space between them is opened.

The decorative panel 98 is held closed by the frame 16 by engaging means (not shown), and the decorative panels 94 and 96 are connected to the lower end of the frame 16 and the decorative panel 98 by operating a handle (not shown). The closed state is maintained (not shown) by inserting the shaft into the engagement holes provided in each of them. Further, the decorative panels 94 and 96 are stacked so as to cover the ends of the protective covers 74 and 76 so that the protective covers 74 and 76 cannot be opened when the decorative covers 94 and 96 are closed.

On the other hand, as shown in FIGS. 7 and 10,
The electrode 3 of the busbar unit 30 is
The drawer bars 100R, 100S, 100T (hereinafter collectively referred to as “drawer bar 100”) connected to the respective 4R, 34S, 34T are pulled out from an opening 26A (see FIG. 10) formed in the base plate 26. Have been. These drawer bars 100 are connected to the busbar unit 30.
Are drawn out along the upper surface of the base plate 26 from the opening 26.
It is bent from A to the back side.

For this reason, as shown in FIGS. 2, 3, 5 and 6, the upper surface of the base plate 26
A cover 102 in the shape of a box that covers 00 is attached.
The cover 102 is adapted to the opening width of the protective cover 74, thereby preventing the charged portion from being exposed and preventing a large step from being generated between the MCCB 50 and the adjacently mounted MCCB 50. I have.

As shown in FIGS. 7 and 10, each of the pull-out bars 100R, 100S, and 100T is bent so that the distal end thereof is parallel to the base plate 26.
Further, each of the drawer bars 100R, 100S, and 100T is connected at a predetermined interval by an insulator (not shown). This insulator is connected to the drawer bar 1
00R, 100S, and 100T can be arranged near the opening 26A of the base plate 26, which is parallel to each other.

The drawer bar 100 is supplied with electric power transformed into a predetermined transmission by a transformer.

For example, as shown in FIG. 10, a lower end of a connection bar 104 disposed upward is connected to a tip end of each of the pull-out bars 100R, 100S, and 100T via a bracket 106. A connection bar 108 (connection bars 108R, 108S, 108T) directed to the back side of the low-voltage switchboard 10 is connected to the upper end of the connection bar 104, and one end of a flexible connection bar 110 is connected to the tip of the connection bar 108. Are linked. The flexible connection bar 110 is connected to the secondary side (low-voltage side) of a transformer (not shown) in the frame 22, so that low-voltage power transformed by this transformer is supplied to the low-voltage switchboard 10 and the bus unit 30 The low-voltage power is supplied to the power load equipment (power distribution board or the like) connected to the MCCB 50 via the MCCB 50 and the MCCB 50.

The drawer bar 100 and the bracket 106, the bracket 106 and the connecting bar 104, and the connecting bar 104 and the connecting bar 108 are fastened by three bolts 112.

As shown in FIG.
Is the drawer bar 100, the bracket 106, the connecting bar 1
04 and 108 formed at predetermined positions
In the state inserted in 4, by screwing into the nut 116, it is tightly connected. In FIG. 11,
As an example, the connection between the connection bar 104 and the connection bar 108 is shown.

At this time, a large disc spring washer 118 is provided facing the head 112A of the bolt 112 and the nut 116. The large disc spring washer 118 is curved so that the center portion protrudes toward the nut 112 and the head 112A of the bolt 112.
The screw is extended from the curved state by screwing, thereby generating a large urging force. Bolt 11
2, the tightening torque is increased by the urging force, and the tightening force between the nut 2 and the nut 116 is increased. Therefore, the drawer bar 100, the bracket 10
6. Each of the connecting bars 104 and 108 can be tightly fastened.

For example, when a large nut and bolt of M12 are used, the conventional combination of a flat washer and a spring washer
Only a tightening torque of 410 kg / cm can be obtained and 1600
With a wiring capacity of A (Amperes), it was necessary to fasten with at least six sets of bolts and nuts (the bolt strength at this time was 4.8).

On the other hand, by using the large disc spring washer 118, a tightening torque of 725 kg / cm, which is about 1.8 times, can be obtained.
Is required). Fastening with three sets of bolts 112 and nuts 116 is sufficient.

Since the large disc spring washer 118 has a large diameter, it can be uniformly pressed and tightened over a wide area, and the drawer bar 100, the bracket 106, and the connecting bar 1 can be tightened.
04 and 108 can be brought into contact with each other with a uniform surface pressure, so that contact resistance can be reduced and heat loss can be reduced.

In the low-voltage switchboard 10 thus formed, a label 120 is attached to the upper center of the figure decorative panel 98. The label clearly indicates the function on the power distribution system 12, that is, whether the power distribution panel is a low-voltage power distribution panel or a light distribution panel.

In the protective covers 74 and 76, recesses 124 are formed in grooves on the hinges 86 side of the openings 88 and 90 (on the center of the low-voltage switchboard 10). This recess 1
A label 122 is attached to 24 for each MCCB 50. By displaying this label 122, each MC
The load equipment connected to the CB 50 is made clear.

The busbar unit 30 is provided in the recess 124.
A groove for attaching the label 122 may be formed in correspondence with the base 32 of the above, so that the label 122 can be attached at an accurate position corresponding to the attachment position of the MCCB 50.

An instrument panel 126 is attached to one decorative cover 94. This instrument panel 126
Is provided with an ammeter 130, a voltmeter 128, changeover switches 134 and 132, and the like.
By the operations of 34 and 132, the current value of each phase of R, S, and T, the voltage value between phases, and the like can be displayed on the ammeter 130 and the voltmeter 128.

The operation of the present embodiment will be described below.
The high-voltage received by the high-voltage switchboard 14 of the power distribution system 12 is transformed into a predetermined voltage by a transformer housed in a frame 22 mounted on the back side of the low-voltage switchboard 10, and then the low-voltage switchboard 10 Is supplied to each. Each of the low-voltage switchboards 10 includes a bus unit 30 connected to a transformer and a bus unit 30.
Is provided, and electric power is supplied to a corresponding load facility by an electric wiring (cable) connected to the MCCB 50.

By the way, each power distribution system 12
Has a plurality of low-voltage switchboards 10, and a frame 22 to which a transformer, a capacitor, and the like can be attached is connected to a frame 16 of each low-voltage switchboard 10. The frame 22 can be left empty if there is no need to attach a high-voltage power receiving device such as a transformer or a condenser.

That is, the frame 16 of the low-voltage switchboard 10
Are connected to adjacent frames of the low-voltage switchboard 10, and are connected between adjacent frames 16 and between the frames 16 and 22 so that wiring can be arbitrarily performed. Therefore, a transformer can be provided in one of the frames 22 connected to the frames 16 of the plurality of low-voltage switchboards 10 arranged side by side, and power can be supplied from the transformer to the plurality of low-voltage switchboards 10.

Accordingly, the number of frames 22 is also determined by the number of low-voltage switchboards 10, and transformers such as transformers and capacitors can be arranged on the fixed number of frames 22. The degree of freedom when installing substation equipment is increased. That is, a high-voltage power receiving device such as a transformer and a capacitor required for the power distribution system 10 is mounted on a predetermined frame 22.

If this frame 22 is standardized in advance together with the frame 16 in accordance with the size of the frame 16 of the low-voltage switchboard 10, the production period of the power distribution system 10 can be shortened, and the design of the power distribution system 10 can be shortened each time. Since there is no need to manufacture the device, manufacturing costs can be reduced.

On the other hand, the low-voltage switchboard 10 normally operates the operating handle 50A of the MCCB 50 with the protective covers 74, 76 and the decorative panels 94, 96, 98 closed to supply power to each load facility. Blocking can be performed.

As shown in FIGS. 4 and 6, in the low-voltage switchboard 10, by opening the decorative panels 94 and 96 and opening the protective covers 74 and 76, the mounting space for the MCCB 50 on the base plate 26 and The space between the base plate 26 and the frame 16 is largely open.

Therefore, the work of connecting the electric wiring to the MCCB 50 and the work of removing the electric wiring from the MCCB 50 become extremely easy.

That is, each of the decorative panels 94 and 96 is opened by rotating about a hinge (not shown) provided on the frame 16 side. Further, since each of the protective covers 74 and 76 is pivoted about a hinge portion 86 provided near the busbar unit 30 on the base plate 26, an opening is provided between the busbar unit 30 and the frame 16. In addition to the decorative panels 94 and 96 provided, the protective covers 74 and 76 do not exist, and the space between the busbar unit 30 and the frame 16 is greatly opened. Therefore, work such as connection of electric wiring to the MCCB 50 can be performed extremely easily without removing the decorative panels 94 and 96 and the protective covers 74 and 76.

When connecting to the bus unit 30 of the MCCB 50, the MCCB 50 is moved toward the bus unit 30 on the base plate 26 with the MCCB 50 facing a predetermined position of the bus unit 30. Thus, a plug-on system is used in which each electrode 34 of the bus unit 30 is sandwiched and connected to the electrode 56 of the MCCB 50. The mounting of the MCCB 50 on the base plate 26 is performed by the MCCB 50
It is only necessary to fix the secondary side of the CB 50 with the bracket 64 or the like. Since the secondary side of the MCCB 50 is a space largely opened by the protective covers 74 and 76 and the decorative panels 94 and 96, the work is extremely easy. Becomes

That is, in the low-voltage switchboard 10, the MCCB
In addition to the connection of the electrical wiring to the MCCB 50, the work of attaching and detaching the MCCB 50 can be easily performed, and the workability thereof is greatly improved.

On the other hand, in the low-voltage switchboard 10, the MCCB 50
Projections 60 are recessed portions 32A of the base 32 of the busbar unit 30.
The MCCB 50 having an arbitrary wiring capacity (interruption capacity) can be attached to an arbitrary position as long as the MCCB 50 is located at a position facing the.
That is, as can be seen by comparing FIGS. 2 and 3 with FIGS. 5 and 6, the MCCB 50 can be mounted side by side from the center of the busbar unit 30.
B50 can also be attached.

Therefore, the mounting space for the MCCB 50 is on the base plate 26, and the transformer and the bus unit 3
If there is room for the capacity of 0, the MCCB 50 can be arbitrarily added.

From this, if the number of low-voltage switchboards 10 and the capacity of the transformer are set in accordance with the total capacity of the load equipment, MC
Even if the number of CB50s and the breaking capacity of each MCCB50 are not determined, the low-voltage switchboard 10 or the power distribution system 12 can be installed, and after the specific load equipment is determined, the MCCB50 can be mounted according to the determined load equipment. good. Therefore, the power distribution system 12 and the low-voltage power distribution panel 10 can be installed before the load equipment to be specifically installed in a new building or factory is determined, and the installation work becomes extremely easy.

On the other hand, in the low-voltage switchboard 10, the decorative panel 9
By opening 8, the upper part of the base plate 26 is opened. At this time, the protective covers 74, 76
Are supported by a ventilation cover 70 above the busbar unit 30 so that the protective covers 74 and 76 do not become unnecessarily large, and a shaft for supporting the protective covers 74 and 76 is Can be prevented from projecting upward.

The electric wiring connected to the load equipment may be drawn into the low-voltage switchboard 10 from a ceiling side in an electric room where the power distribution system 12 and the low-voltage switchboard 10 are installed by a rack or the like.

MCCB 5 mounted on low-voltage switchboard 10
Since the height of 0 is limited to a height at which the operation handle 50A can be easily operated, an upper space in the frame 16 becomes empty. If the upper space in the empty frame 16 is closed, it is difficult to pull in the electric wiring from above.

On the other hand, in the low-voltage switchboard 10, the space above the frame 16 can be opened by the decorative panel 98, and the protective covers 74, 76 and the protective covers 74, 76 are provided above the base plate 26. Since the supporting shaft does not protrude, the upper part of the base plate 26 can be largely opened. This facilitates the work of drawing the electric wiring into the low-voltage switchboard 10 from above, and also opens the space between the busbar unit 30 and the frame 16 in the low-voltage switchboard 10 continuously with the space above the frame 16. Therefore, the electric wiring drawn in from above can be easily connected to the MCCB 50.

In this embodiment, the low-voltage switchboard 10
However, the present invention may be applied to a light switchboard for supplying electric power to the light load equipment, and the light switchboard and the power switchboard to which the present invention is applied constitute power distribution equipment (the power distribution system 12). Is also good. That is, the power distribution system 12 can be integrally formed by a plurality of light switchboards and power switchboards.

The present embodiment described above is an example of the present invention, and the configuration of the low-voltage switchboard 10 and the power distribution system using the low-voltage switchboard 10 does not limit the present invention. INDUSTRIAL APPLICABILITY The present invention can be applied to a low-voltage switchboard having a configuration in which a bus portion is provided in the center along the vertical direction and wiring breakers are attached to both sides of the bus portion, and a power distribution system configured using the low-voltage switchboard. it can.

[0086]

As described above, according to the present invention, since the protective cover is opened by rotating the protective cover about the axis along the bus bar vertically arranged at the center, the secondary side of the circuit breaker for wiring is opened. Can be widely opened, and an excellent effect that connection of the electric wiring to the wiring breaker becomes extremely easy can be obtained.

Further, according to the present invention, the circuit breaker for wiring is connected to the bus bar in a plug-on manner, so that the circuit breaker for wiring can be easily attached / detached even if the open protective cover remains near the bus bar. Can be. Further, in the present invention, since the hinge portion for receiving the protective cover is also used by the ventilation covers opposed to both ends of the busbar portion, the shaft supporting the protective cover does not reach the upper frame, and the upper portion of the frame is enlarged. Can be opened.

[Brief description of the drawings]

FIG. 1 is a schematic layout diagram of a power distribution system using a low-voltage switchboard to which the present invention is applied.

FIG. 2 is a perspective view schematically showing the appearance of a low-voltage switchboard.

FIG. 3 is a schematic perspective view showing a frame of a low-voltage switchboard.

FIG. 4 is a schematic perspective view showing a state in which a protective cover and a decorative panel on a front surface of a low-voltage switchboard are opened.

FIG. 5 is a schematic front view of a low-voltage switchboard.

FIG. 6 is a schematic front view of a low-voltage switchboard corresponding to a state where a protective cover and a decorative panel are opened.

FIG. 7 is a schematic side view of the low-voltage switchboard showing a state where a side panel is removed.

FIG. 8 is a perspective view of a main part showing a bus unit and MCCB.

FIG. 9 is a schematic perspective view showing a ventilation cover and a hinge portion.

FIG. 10 is a schematic perspective view showing an example of connection between a drawer bar for supplying power to the bus unit and a connection bar.

FIG. 11 is a schematic diagram showing connection of a connection bar by a bolt and a nut.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Low-voltage switchboard 12 Power distribution system 16 Frame (box) 26 Base plate 34 Electrode (plate-shaped electrode) 30 Busbar unit (busbar) 50 MCCB (circuit breaker for wiring) 70 Ventilation cover 74, 76 Protective cover 80 Hinge base (shaft) Supporting means) 82 Bracket (shaft supporting means) 84 Screw (shaft supporting means) 86 Hinge part 94, 96 Decorative panel (panel part)

Claims (3)

[Claims] 1. A base plate on which a set of bus bars is extended, and a circuit breaker for wiring is mounted on both sides of the bus bar, and a mounting surface of the bus bar and the circuit breaker for the base plate is open. A box body that houses the base plate facing the set surface, a pair of protective covers that divide the bus bar portion therebetween and cover the base plate-shaped bus bar portion and the circuit breaker, Hinge portions provided on both sides along the longitudinal direction to rotatably support each of the pair of protective covers; and a hinge portion rotatably mounted around a hinge provided at an opening periphery of the box body, A protective cover covering the upper surface of the base plate and a panel covering the periphery of the opening. 2. The system according to claim 2, wherein the bus bar includes a plate-like electrode in which electrodes of each phase of low-voltage power are formed in a plate-like shape, and the plate-like electrode is held at a predetermined interval. And pressing each of the plate-shaped electrodes toward the bus bar portion so as to sandwich and connect each of the plate-shaped electrodes.
Low-voltage switchboard described in. 3. The ventilation cover, wherein the hinge portion is disposed opposite to both ends in the longitudinal direction of the bus bar portion to cover the charging portion and has a plurality of ventilation holes, and the pair of the ventilation covers have the pair of hinges. Pivoting means for pivoting each of the protective covers;
The low-voltage switchboard according to claim 1 or 2, further comprising: