JP3049677U - Switchgear - Google Patents

Abstract

(57) [Problem] A switch capable of reducing the width and depth of a box to reduce the occupied area, making it easy and safe to draw in a power cable and check a circuit breaker. Providing gear. A front door and a circuit breaker are attached via a mounting plate to a door draw-out rail slidably disposed on one side wall in a box body, and the front door is opened and closed via a door draw-out rail. The breaker can be pulled out, and the breaker can be pulled out further through the breaker draw-out rail arranged on the mounting plate. A current transformer connected in parallel with the circuit breaker and the power cable is arranged in parallel in the depth direction at a position below the circuit breaker near the other side wall opposite to the circuit breaker in the box. It is characterized by being installed.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a switchgear (closed switchboard), and particularly relates to a rational arrangement structure for a main circuit device box including a circuit breaker and a front door drawer structure.

[0002]

[Prior art]

 As a conventional switchgear, for example, there is one having a structure shown in FIGS. However, in this case, as shown in the figure, the conventional switchgear 1 ′ is composed of a three-phase power supply-side disconnection portion and a load-side disconnection portion of the circuit breaker 2, the current transformers 3, 3, and the main circuit. Since the conductors 4 and 4 are both arranged in parallel along the width direction of the box 1a (horizontal direction with respect to the floor), the width dimension of the switch gear 1 'is large. Further, since the circuit breaker 2, the current transformer 3 and the main circuit conductor 4 are all arranged in parallel along the depth direction of the box 1a, the size of the switch gear 1 'in the depth direction cannot be too large. Did not get. Therefore, the area occupied by the switchgear 1 'on the floor surface becomes large, and the power cable 5 connected to the circuit breaker 2 via the main circuit conductor 4 to which the current transformer 3 is connected and supplying power to the load is provided. The work of pulling into the box 1a must also be performed from behind by opening the rear door 6, which is troublesome, and has a problem in the easy and safe inspection work of the circuit breaker 2. In the drawing, 8 is a front door, 10 is an instrument attached to the front door 8, 13 is a power bus, and 14 is an insulator supporting the power bus 13 and the main circuit conductor 4.

[0003]

[Problems to be solved by the invention]

 In view of the above, the present invention solves the above-mentioned disadvantages of the prior art by applying rational measures to the arrangement of the main circuit devices in the switchgear, the draw-out structure of the circuit breaker, etc., and the arrangement structure with respect to the box body. An object of the present invention is to provide a switchgear which is suitable for use, for example, in which the area occupied by the switchgear with respect to the floor is greatly reduced, and the work at the time of checking the circuit breaker can be performed easily and safely. Is what you do.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention attaches a front door and a circuit breaker via a mounting plate to a door draw-out rail slidably disposed on one side wall in the box body, and provides a door draw-out rail. The front door and the circuit breaker can be drawn out of the box body through the breaker, and the circuit breaker can be further drawn out through the breaker draw-out rail slidably mounted on the mounting plate. The power-supply-side disconnection part and the load-side disconnection part are respectively arranged in parallel along the vertical direction of the box, and the current transformer connected to the breaker and the main circuit conductor connected to the power cable is connected to the inside of the box. The first arrangement is that the circuit breaker is arranged in parallel along the depth direction of the box at a position below the circuit breaker near the other side wall opposite to the one side wall where the circuit breaker is arranged. It is a feature. In addition to the above-mentioned means, in order to prevent danger caused by pulling out the circuit breaker through the door draw-out rail when the power supply side disconnection part and the load side disconnection part of the circuit breaker are in the connection position, A second feature is that a stopper is provided by fitting a pin into a fitting hole or the like, so that the safety of the work at the time of inspection of the breaker is further improved. Further, in addition to the first means, in order to reduce the occupied area of the switchgear and further rational arrangement of the main circuit device, the circuit breaker connection terminal connected to the load-side disconnection portion of the circuit breaker is made of an insulating resin. The third feature is that the circuit breaker and the current transformer are connected via a relay conductor and a main circuit conductor which are integrally formed. Of course, in addition to this, the third means may be taken in addition to the second means.

[0005]

[Embodiment of the invention]

 A switch gear according to an embodiment of the present invention will be described with reference to FIGS. 10 and 11 indicate the same members.

Reference numeral 1 denotes the entire structure of the switchgear. A door draw-out rail 9 slidable with respect to one side wall (can be pulled out to the outside) is vertically provided on one side wall in the box 1a. It is arranged in three directions in the upper, middle and lower directions. That is, U-shaped metal fittings 9 'are fixedly arranged in three stages on one side wall in the box 1a at appropriate intervals in the vertical direction, and a rectangular plate-shaped door drawer is provided in each of the U-shaped metal fittings 9'. The slide 9 is slidably fitted. A door mounting plate 15 and a circuit breaker mounting plate 12 are fixed to the door draw-out rail 9, and the front door 8 and the circuit breaker 2 are respectively linked to these mounting plates 15, 12 as described later. It is attached. Therefore, the front door 8 and the circuit breaker 2 can be simultaneously drawn out of the box 1a through the sliding operation of the door draw-out rail 9 (however, in a certain case, as described later, there is a danger). To prevent this, a stopper is provided to prevent the pull-out operation via the door pull-out rail 9).

The front door 8 is attached to the door mounting plate 15 by a hinge (not shown) so as to be freely opened and closed (rotated). An instrument 10 is attached to the front door 8 so as to straddle the front and rear surfaces as in the related art.

As shown in FIG. 8, a U-shaped metal fitting 7 ′ is fixed to the circuit breaker mounting plate 12 in two upper and lower stages, and each of the U-shaped metal fittings 7 ′, 7 ′ has a rectangular shape. The plate-shaped circuit breaker draw-out rails 7, 7 are slidably fitted (can be pulled out to the outside). A pair of circuit breaker mounting brackets 11, 11 are fixed to the circuit breaker draw-out rails 7, 7, and the circuit breaker 2 is detachably mounted on the circuit breaker mounting brackets 11, 11. Therefore, the circuit breaker 2 can be independently drawn out through the circuit breaker draw-out rails 7, 7 independently of the operation of pulling out the door draw-out rail 9.

In the box 1a, a three-phase power supply disconnecting portion 2a and a load side disconnecting portion 2b are arranged in the up-down direction (in the direction perpendicular to the floor surface) on the rear side of the circuit breaker 2 and closer to the front side thereof. ) Are arranged in parallel. On the rear wall side of the box body 1a, as shown in FIG. 1 and FIG. 4, a power supply bus 13 is disposed in three stages vertically and supported by a pair of insulators 14, respectively. Each of the contact portions 13a of 13 is fitted and connected to the power supply side disconnecting portion 2a of the circuit breaker 2.

As shown in FIGS. 1, 2 and 4, a pair of current transformers 3 and 3 connected to the main circuit conductors 4 and 4 connected to the circuit breaker 2 and the power cable 5 have a box body 1a. The inside of the box 1a is arranged in parallel in the depth direction of the box 1a at a position below the circuit breaker 2 near the side wall opposite to the one side wall on which the circuit breaker 2 is disposed. The current transformers 3, 3 are connected to the main circuit conductors 4, 4, connected to the circuit breaker 2 via the main circuit conductor 4 and the mold type relay conductor 16, and connected to the main circuit conductors 4, 4. Is connected to the power cable 5 connected to the load via the. Therefore, the main circuit conductors 4 and 4 are also arranged in parallel along the depth direction of the box 1a, like the current transformers 3 and 3. The mold-type relay conductor 16 has a circuit breaker connection terminal 16a which is fitted and connected to the load-side disconnecting portion 2b of the circuit breaker 2 in three steps in the vertical direction on the side surface, and the main circuit conductors 4, 4 on the lower side. The two-phase terminals 16b and 16b connected to the power cable 5 and the middle-phase terminals 16c connected to the power cable 5 are integrally formed of insulating resin.

Although not shown, a stopper pin is formed on the circuit breaker mounting plate 12 fixed to the door draw-out rail 9, and the stopper pin is provided in the circuit breaker 2 in the closed state ( (When the power supply side disconnecting portion and the load side disconnecting portion are at the connection positions respectively), the stopper is set so as to fit into a fitting hole (not shown) provided in the side wall of the box 1a. -The front door 8 and the circuit breaker 2 cannot be pulled out via the door draw-out rail 9 as long as the mechanism is working. Therefore, this stopper prevents the risk of the circuit breaker 2 moving along with the sliding of the door draw-out rail 9 due to the careless withdrawal of the front door 8 when the circuit breaker 2 is closed. doing. When the front door 8 and the circuit breaker 2 are drawn out through the door draw-out rail 9, the circuit breaker 2 is opened and the stopper is released.

When performing work such as inspection and replacement of the circuit breaker 2, as described above, the circuit breaker 2 is opened as shown in FIG. Withdrawal. Since the stopper is released by opening the circuit breaker 2, the circuit breaker 2 can be pulled out. At this time, if the circuit breaker 2 is simply pulled out to the outside via the circuit breaker draw-out rail 7, As shown in FIG. 5, when the front door 8 is opened, the opening and closing angle is limited, and the instrument 10 is attached to the front door 8 across the front and rear surfaces. 2 come into contact with each other, and it is difficult to pull out to the outside. However, since the front door 8 is not simply attached to the box 1a so as to be freely opened and closed but can be pulled out through the door draw-out rail 9, as shown in FIG. The front door 8 can be pulled out to the outside, and the circuit breaker 2 is also pulled out to the outside, and the circuit breaker 2 is pulled out to the outside via the breaker draw-out rail 7 to shut off the door. The circuit breaker 2 is sufficiently drawn out of the box 1a without coming into contact with the rear part of the meter 10, and the circuit breaker 2 is detachably mounted on the circuit breaker mounting bracket 11, so that the circuit breaker 2 can be inspected. In addition, the replacement operation can be performed safely and easily.

In the above-described embodiment, rectangular plate-shaped rails 9 and 7 are used as members for simultaneously pulling out the front door 8 and the circuit breaker 2 to the outside of the box 1a and as members for independently drawing out the circuit breaker 2. Is slidably fitted to the U-shaped metal fittings 9 'and 7' fixed to the side wall of the box 1a and the mounting plate 12, but in the opposite form, that is, the receiving metal is rectangular plate-shaped. The rail that fits and slides on the rail may be U-shaped. In order to prevent the danger of pulling out the circuit breaker 2 through the careless door draw-out rail 9 when the circuit breaker 2 is closed, the above-mentioned stopper mechanism by fitting the stopper pin and the fitting hole is used. The present invention is not limited to this, and any other appropriate structure such as other engagement means may be used.

[0014]

[Effect of the invention]

 Since the present invention has the above-described configuration, the above-mentioned various disadvantages of the conventional switchgear can be surely solved, and the following specific effects can be obtained.

[0015] In the invention according to claim 1, unlike the conventional art, the power supply side disconnection part and the load side disconnection part of the three-phase arrangement of the circuit breaker are arranged in parallel along the vertical direction of the box, respectively. In addition, since the pair of current transformers and the main circuit conductor are arranged in parallel along the depth of the box, the width of the switchgear in the width direction of the box can be significantly reduced. Since the circuit breaker, the pair of current transformers, and the main circuit conductor are arranged in parallel in the width direction of the box and at different vertical positions, the size of the box in the width direction is not increased. The dimension in the depth direction could be reduced significantly. Therefore, the area occupied by the switchgear on the floor surface can be significantly reduced and downsized compared to the past, and the cumbersome work of pulling in the power cable, which was conventionally only possible from the rear side of the box, can be performed on the front side. It is easy to carry out and suitable for use. In addition, not only the circuit breaker but also the front door can be pulled out to the outside via the draw-out rail. Since it can be pulled out, the work such as inspection and replacement can be performed easily and safely. Further, as the width of the box is reduced, as shown in FIG. 4, the distance L between the supports of the power supply bus 13, that is, the space between the pair of insulators 14, 14 is also reduced. The burden on the insulator 14 that supports the electromagnetic force due to the short-circuit current flowing when a short circuit occurs is reduced.

In the invention according to the second aspect, when the circuit breaker is in a closed state, the front door is shut off via the door draw-out rail by an appropriate stopper such as stop by engagement of the pin and the fitting hole. Since the circuit breaker cannot be pulled out and the danger of the circuit breaker being pulled out due to carelessly pulling out the front door is reliably prevented, the safety of the work during the inspection of the circuit breaker can be further enhanced.

In the invention according to claim 3, the circuit breaker and the current transformer are arranged opposite to each other on both sides of the box body and the current transformer is positioned below the circuit breaker. Since the breaker and the main circuit conductor to which the current transformer was connected were connected via a relay conductor in which the breaker connection terminal connected to the load-side disconnection part was integrally molded with insulating resin, the load-side disconnection part of the breaker was connected. The connection structure between the power transformer and the current transformer can be made simple and rational, and contributes to safety by the insulating coating and reduction of the occupied area of the entire switchgear.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a switchgear according to an embodiment of the present invention.

FIG. 2 is a cross-sectional front view of the same.

FIG. 3 is a front view of the same.

FIG. 4 is a cross-sectional plan view of the same with the circuit breaker in a connection position.

FIG. 5 is a cross-sectional plan view of the same when the front door is opened and the circuit breaker is in a disconnection position.

FIG. 6 is a cross-sectional plan view of the same when the front door and the circuit breaker are pulled out.

FIG. 7 is a cross-sectional front view showing details of a drawer structure of the front door.

FIG. 8 is a cross-sectional front view showing details of a drawer structure of the circuit breaker.

FIG. 9 is a cross-sectional plan view showing details of a drawer structure of the front door and the circuit breaker.

FIG. 10 is a front view of a conventional switchgear.

FIG. 11 is a vertical sectional side view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Switchgear 1 'Conventional switchgear 1a Box 2 Circuit breaker 2a Power supply side disconnection part 2b Load side disconnection part 3 Current transformer 4 Main circuit conductor 5 Power cable 6 Rear door 7 Breaker draw-out rail 7' U-shaped bracket 8 Front door 9 Door pull-out rail 9 'U-shaped bracket 10 Meter 11 Circuit breaker mounting bracket 12 Circuit breaker mounting plate 13 Power bus 13a Contact part 14 Insulator 15 Door mounting plate 16 Mold type relay conductor 16a Terminal 16b Both-phase terminal 16c Medium-phase terminal L Support interval of busbar 13 (interval of mounting insulator 14)

Claims (3)

[Utility model registration claims] 1. A front door and a circuit breaker are mounted on a door draw-out rail slidably disposed on one side wall in the box body via a mounting plate, and the front door and the circuit breaker are connected via a door draw-out rail. The circuit breaker can be drawn out of the box body, and the circuit breaker can be further drawn out through a circuit breaker draw-out rail slidably mounted on the mounting plate. The side disconnecting portions are respectively arranged in parallel along the vertical direction of the box body, and the current breaker connected to the circuit breaker and the main circuit conductor connected to the power cable is arranged in the box body. A switch gear, which is arranged in parallel along the depth direction of a box body at a position below a circuit breaker near the other side wall opposite to the one side wall. 2. A front door and a circuit breaker are mounted on a door draw-out rail slidably disposed on one side wall in the box body via a mounting plate, and the front door and the circuit breaker are connected via a door draw-out rail. The circuit breaker can be drawn out of the box body, and the circuit breaker can be further drawn out through a circuit breaker draw-out rail slidably mounted on the mounting plate. The side disconnecting portions are respectively arranged in parallel along the vertical direction of the box body, and the current breaker connected to the circuit breaker and the main circuit conductor connected to the power cable is arranged in the box body. Along the other side wall, opposite to the one side wall, and arranged below the circuit breaker in parallel along the depth direction of the box, the power supply disconnecting portion of the circuit breaker and the load side To prevent danger caused by pulling out the circuit breaker through the door draw-out rail when the disconnecting parts are at the connection positions, respectively. Switchgear, wherein a is disposed - stopper breaker. 3. A front door and a circuit breaker are attached via a mounting plate to a door draw-out rail slidably disposed on one side wall in the box body, and the front door is connected to the front door via a door draw-out rail. The circuit breaker can be drawn out of the box body, and the circuit breaker can be further drawn out through a circuit breaker draw-out rail slidably mounted on the mounting plate. The side disconnecting portions are respectively arranged in parallel along the vertical direction of the box body, and the current breaker connected to the circuit breaker and the main circuit conductor connected to the power cable is arranged in the box body. On one side wall and the other side wall on the opposite side. A relay conductor and a main circuit, which are arranged below the circuit breaker in parallel along the depth direction of the box, and in which the breaker connection terminal for connecting to the load-side disconnection part of the circuit breaker is integrally formed of insulating resin. A switchgear wherein a circuit breaker and a current transformer are connected via a conductor.