JP3206074B2 - switchboard - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchboard, and more particularly to a switchboard having a degree of freedom in operation such as planning and changing a switchboard.

[0002]

2. Description of the Related Art A switchboard houses therein devices such as a circuit breaker, a bus, and a cable head, and supplies power to a load from the bus via the circuit breaker and the cable head. It is configured as shown in Japanese Patent No. 60-234404.

[0003]

In a conventional switchboard, a plurality of devices, such as a plurality of circuit breakers, busbars, and cable heads, are housed in a single housing. It was necessary to review and change the overall configuration. For example, when it is desired to increase the current-carrying capacity of the circuit breaker due to an increase in load demand, the arrangement of all the devices in the panel must be reviewed, and in some cases, it may not be possible to store the devices. In addition, this change must be made by stopping the power supply to the bus and all the devices connected to the bus.

In view of the above, it is an object of the present invention to provide a switchboard having a degree of freedom in operation such as planning and changing the switchboard.

[0005]

According to the present invention, in a switchboard for housing a bus bar and a plurality of electric machines, the electric machines are housed in separate compartments, and the bus is provided in a common unit. The individual compartments and the common unit were attached so that they could come and go.

[0006]

The problem of the low degree of freedom in the operation of the conventional switchboard planning and change is the problem that all devices such as multiple circuit breakers, busbars, and cable heads are housed in one housing. Is due. According to the present invention, each device is housed in an individual compartment, the bus is provided in the common unit, and then the individual compartment and the common unit are attached so as to be able to be separated from each other. Of the equipment or the bus.

[0007]

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

FIG. 2 shows an external structure of a two-stage switchboard as an example of the present invention. A switchboard 1 includes two upper and lower busbar units 2.
And a plurality of rows (8 boards in the example in the figure) arranged in two rows above and below
Of the power distribution unit 3. One major feature of the present invention is that the busbar unit 2 and the power distribution unit 3 are detachably attached to each other.
In the following description, an example in which the bus unit 2 is fixed and the power distribution unit 3 is separated will be described. However, this may be configured such that the power distribution unit 3 is fixed and the bus unit is separated.

FIG. 3 shows an example of a system circuit diagram of the switchboard of FIG. The power distribution unit 3 of the switchboard 1 includes the load unit 1
1, a bus unit 2, a power receiving unit 4, a bus communication unit 5, a transformer unit for a grounding instrument 6, a transformer unit for an instrument 7, an arrester unit 8, and the like. In this figure, 9 is a circuit breaker, 15 is a transformer for a grounding instrument, 1
Reference numeral 6 denotes an instrument transformer, and reference numeral 17 denotes a lightning arrester, which are detachably attached to the bus 10 by an automatic connection / disconnection unit 31, respectively.
The load unit 11 which is a main unit of the power distribution unit 3 includes a circuit breaker 9, a current transformer 12, a zero-phase current transformer 13 connected via an automatic connection / disconnection unit 31, and an external drawer. It is composed of a cable head 14. The bus unit 2 is provided commonly to the power distribution units 3 configured in a row.

FIG. 1 shows the arrangement of equipment inside the load unit 11 and the bus unit 2 which are main units of the power distribution unit 3, and the power distribution unit 3 and the bus unit 2 can be separated from each other as described above. It is said. A bus 24 for three phases extending in the horizontal direction is provided inside the bus unit 2.
Is attached. The load unit 11 is partitioned into two compartments 41 and 60, in which a circuit breaker 9 is placed horizontally, and a circuit breaker unit 30 that houses a three-phase circuit breaker is installed in the height direction. . The surface formed by the three-phase bus 24 and the surface formed by the circuit breaker unit 30 are arranged to be orthogonal to each other. And
The bus bar 24 and the circuit breaker 9 are detachably connected directly by a contact attached to the circuit breaker 9 without using a connection conductor, as described in detail later. A load cable is installed in the compartment 60. Compartments 41 and 6
Between 0, an insulated conductor 50 is provided. Insulated conductor 50
Is made of molded resin of a three-phase conductor connected to a load cable, and is arranged in the height direction. Insulated conductor 50
The circuit breaker 9 is detachably connected directly to the circuit breaker 9 by a contact attached to the circuit breaker 9 without using a connection conductor, as described in detail later. The load cable electrically connected to the insulated conductor 50 is taken out to the upper part of the distribution board in the upper distribution unit, and is taken out to the lower part of the distribution board in the lower distribution unit.

According to the present invention, by arranging the horizontal breakers in the height direction, the width of the switchboard surface 70 is shortened, and the bus bar 24 and the breaker 9 are detachably connected without using a connection conductor by a contact. By being freely and directly connected, the depth of the switchboard can be reduced. Further, since the power distribution unit 3 can be separated from the bus unit 2 and the internal devices (the circuit breaker 9 and the bus 24) can also be separated, the operation after the distribution board is installed can be extremely smooth. For example, it may be desired to change the breaker capacity or the like due to an increase in the load. However, since the power distribution unit 3 can be removed together with its internal devices, the change can be performed while the other power distribution unit 3 and the bus unit 2 are operated. It is possible. In addition, since the power distribution unit is unitized, it is only necessary to attach the power distribution unit 3 containing devices of different capacities. Further, since the bus 24 and the circuit breaker 9 are detachably connected directly by a contact without using a connection conductor, when it is desired to change the circuit breaker capacity or the like by increasing the load, a circuit breaker or a bus in another unit is required. Can be changed while the power is on.
In this regard, in the case of the conventional method in which the bus bar 24 and the circuit breaker 9 are connected by a connection conductor, the connection conductor is often not made to withstand the current flowing through the changed circuit breaker in many cases. At the same time, it is necessary to change the connection conductor in the energized state, and it is necessary to stop the energization of the bus.

FIG. 4 is an internal configuration of the lower bus unit 2 of the bus unit 2 in section AA of the switchboard 1 of FIG. 2, FIG. 5 is an external view of the bus unit 2, and FIG. 6 is a front view of the bus unit 2. 7 is a view showing a cross section taken along the line BB of FIG. 6, and the busbar unit 2 is attached to the lower support 20 by a busbar case 21.
Is installed. Both ends of the busbar case 21 are bent so that the power distribution unit 3 side has an opening 27 necessary for moving the device. A hole 28 for fixing the power distribution unit 3 is provided in the bent portion. Double busbars 24 and 25 are attached to busbar case 21 via insulator 23.
The double buses 24 and 25 are both provided to extend in the horizontal direction, and a shunt piece 26 is provided between the buses 24 and 25. The use of a configuration in which a double bus is used and the space between the two is connected by the shunt piece 26 is one of the major features of the present invention. The operation and effect of this will be described later.

FIG. 8 shows the internal configuration of the lower power distribution unit 3 of the power distribution unit 3 in the cross section AA of the power distribution panel 1 in FIG. 1, and the power distribution unit 3 and the busbar unit 2 are arranged in the cross section CC. It is detachably mounted and secured with bolts through holes 28. An insulated conductor 50 is provided to penetrate the compartment 41 and the compartment 60 in the front height direction of FIG. The insulated conductor 50 has a three-phase conductor installed therein and is resin-molded. One end of the three-phase conductor is attached to the load cable 61 in the compartment 60 so as to be capable of coming and going. The other end of the three-phase conductor of the insulated conductor 50 is detachably connected directly to the circuit breaker 9 in the compartment 41, and this configuration will be described later.

FIG. 10 is a view showing the external appearance of the circuit breaker unit 30 installed in the compartment 41. For example, the vacuum circuit breaker 9 is placed horizontally, and the three-phase circuit breakers 9 are arranged in the height direction. Thus, the unit 30 is configured. Although the example of the figure is a vacuum circuit breaker, it may be a circuit breaker having another operation principle. Reference numeral 35 denotes a drive mechanism of the circuit breaker contacts, and the opening direction of the contacts of the circuit breaker, that is, the axis of the circuit breaker is horizontal. At the tip of the circuit breaker 9 on the stator side, a busbar-side contact 31 is provided. In addition, a contact 34 on the insulated conductor 50 side is provided on a side of the circuit breaker at a terminal on the mover side of the circuit breaker. Reference numeral 36 denotes a partition wall that separates the circuit breakers 9 for insulation.

FIG. 9 shows a state of connection between the circuit breaker 9 and the bus 24 with the insulated conductor 50 removed from the cross section of FIG. FIG. 11 shows an external appearance of a connection state between the circuit breaker 9 and the bus 24. These contacts 31 are directly connected to the double bus 25 detachably without using a connection conductor. A large current flows from the buses 24 and 25 to the load cable 61 via the circuit breaker 9 in a normal operation state or during an accident. Therefore, in order to reduce the size of the switchboard, it is important to suppress heat generation in these devices or conductors and quickly dissipate the heat generation. In the present invention, heat generation from the conductor can be reduced by detachably connecting directly and using a double bus, and heat dissipation can be performed smoothly. In other words, the current in the switchboard flows from the bus 24 via the plurality of connection pieces 26 and the bus 25 to the circuit breaker 9, and the amount of heat generated is small and the surface area increases because the current in each branch is small. The heat can be dissipated smoothly.

FIG. 12 shows the breaker unit 30 and the insulated conductor 5.
It is an external view which shows the connection state of 0. The current transformer 12 is provided below the insulated conductor 50, and the cable head 61 is fitted into the cable head attachment portion 62. On the other hand,
The other end of the insulated conductor 50 has a breaker connection portion 32, and a contact 34 on the load side of the breaker 9 is attached.

FIGS. 13 and 14 are sectional views taken along line DD in FIG.
The connection state of each device in the E section is shown. FIG.
, The circuit breaker unit 30 is movably mounted in the direction of the arrow, and the contacts 31, 34 are detachably and directly connected to the bus bar 25 and the insulated conductor 50, respectively, in the inserted state. FIG. 15 is an enlarged view showing a connection state between the circuit breaker and the insulated conductor 50. In these figures, insulated conductor 50
Has an insulating layer 53 formed by molding a three-phase conductor 51 and a load-side contact piece 32 with an insulating member. Load side contact piece 32
Are arranged at positions where they contact the load-side contact pieces 34 of the circuit breaker 9. One end of each contact piece 32 is connected to the vertical conductor 51. Each phase vertical conductor 51 is arranged at a predetermined interval in the moving direction of the circuit breaker, that is, in the depth, and the width of the switchboard is reduced. When contacting the three-phase vertical conductor 51 and the three-phase load contact piece 32, at least the two-phase load contact piece 32 is bent so as to reduce the inclination angle inclined in the circuit breaker direction,
Each load contact piece 32 has a different height but is drawn to the same draw position. The lower end of the vertical conductor 51 is connected to the load cable chamber 60.
And is connected to the load cable 61 and integrally molded with resin.

FIG. 9 shows a state in which the circuit breaker 9 is connected to the bus 25 (operation position), while FIG. 16 shows a state in which the circuit breaker 9 is pulled out toward the switchboard surface 70 (disconnection position). ing. FIG. 17 shows a state in which the switchboard door 70 is opened while the circuit breaker 9 is connected, and FIG. 18 shows a state in which the circuit breaker unit 30 is pulled out along the guide rail 80. According to the present invention, it is apt to be considered that the inspection, repair, etc. in the power distribution unit became difficult as a result of the very small volume. However, as shown in FIG. This is of little concern since the power distribution unit itself can be pulled out of the bus and the power distribution unit itself can be separated from the bus.

The switchboard of the present invention is configured as described above and has the following functions and effects. In the circuit breaker 9, the circuit breaker was arranged in the horizontal direction and stacked in three stages in the height direction to reduce the width of the circuit breaker and the switchboard in the width direction. As a result,
Although the circuit breaker has a longer depth direction, the power supply side contact is detachably disposed directly at right angles to the bus bar 25 to omit the branch conductor and the insulation mold disconnecting portion in the conventional switchboard, thereby reducing the depth dimension. . Therefore, the volume of the switchboard was significantly reduced. Furthermore, since the insulated conductor 50 has the three-phase vertical conductor and the load contact pieces arranged at predetermined intervals in the moving direction of the circuit breaker, the width dimension is smaller than the depth dimension,
Since the width of the switchboard can be reduced, the volume of the switchboard can be further reduced. By the way, according to the present invention, the height is 2.3 meters, which is the same as the conventional one, but the depth can be 0.9 meters and the width is 0.3 meters, and the volume can be reduced to 1/5 at the conventional cost. Can be.

Further, in the present invention, the power-supply side contact of the circuit breaker 9 is detachably connected directly to the double bus. Therefore, the current from the bus 24 flows to the circuit breaker 9 via the shunting section and the connecting bus, thereby reducing the amount of heat generated and greatly contributing to the reduction in the volume of the switchboard. In other words, it is possible to double the circuit breaker conduction capacity if the same current flows as before in each branch section of the double bus. This means that it is easy to make a unit with a capacity. Also,
According to the present invention, the power distribution panel is configured by a plurality of power distribution units 3 and a common bus unit, and the power distribution unit 3 is arranged in a row configuration. Then, the power distribution unit 3 and the common bus unit can be separated from each other. As a result, it is easy to change the switchboard when the load increases, and the unitization facilitates the switchboard combination design.

The following are some alternative examples of the present invention. As described above, according to the present invention, 1 /
Although the volume ratio can be set to 5, an alternative in which the conventional ratio is reduced to an appropriate one while utilizing the concept of the present invention can be used.

In the present invention, the circuit breakers are laid horizontally and three phases are stacked in the height direction. However, this is not necessarily intended to be stacked on the same plane, and some of the circuit breakers are horizontal. It may be arranged in the direction away. Rather,
In some cases, it may be advantageous to arrange the circuit breakers so that they can move in the horizontal direction. In the embodiment, the power-supply-side contact is in contact with the horizontal bus. However, when the contact state at this portion deteriorates, the contact state can be recovered by shifting the contact position in the horizontal direction. Further, the arrangement of the load-side contacts can be slightly shifted similarly to the power supply side.

In the embodiment, the generatrix is extended in the horizontal direction, and the three phases are vertically arranged. However, this need not necessarily be the case. Some of them may be shifted in the depth direction. Further, the bus and the circuit breaker may not be directly connected detachably, but may be connected by a connection conductor having a short capacity.

In the present invention, the bus unit 2 and the power distribution unit 3 can be separated from each other. In the embodiment, the power distribution unit is separated from the bus unit. May be separated.

Also, as a power distribution unit, equipment such as a grounding instrument transformer, an instrument transformer, and a lightning arrester can be directly connected in a detachable manner in the same manner as in the case of a circuit breaker, by fixing contacts to these devices. It is possible. In the embodiment, the circuit breaker side is formed as a convex portion and the bus bar side is formed as a concave portion for direct connection in a detachable manner. However, the relationship may be reversed. Although the contact is mounted on the circuit breaker side, it is conceivable that the bus has the contact on itself.

[0026]

According to the present invention, each device is housed in an individual compartment, and the bus is provided in the common unit. Then, the individual compartment and the common unit are detachably attached to each other. The change of the equipment can be such that it does not affect other equipment or the bus.

[Brief description of the drawings]

FIG. 1 is a diagram showing an internal connection relationship of a two-stage switchboard of the present invention.

FIG. 2 is a diagram showing an overall appearance of a two-stage switchboard of the present invention.

FIG. 3 is a diagram showing an example of electric circuit connection in a two-stage switchboard of the present invention.

FIG. 4 is an AA cross-sectional view of the bus unit of FIG. 2;

FIG. 5 is an external cross-sectional view of the bus unit.

FIG. 6 is a front view of the bus unit.

FIG. 7 is a plan view of the bus unit.

FIG. 8 is an AA sectional view of the bus unit and the power distribution unit of FIG. 2;

9 is a view in which the insulated conductor 50 is removed from the cross-sectional view of FIG.

FIG. 10 is an external view of a circuit breaker unit.

FIG. 11 is an external view showing the connection between the circuit breaker unit and the double bus.

FIG. 12 is an external view showing the connection between the circuit breaker unit and the insulated conductor 50.

FIG. 13 is a sectional view taken along line DD of FIG. 8;

FIG. 14 is a sectional view taken along line EE of FIG. 8;

FIG. 15 is a diagram showing a connection between the circuit breaker unit and the insulated conductor 50;

FIG. 16 is a diagram showing an open state between the circuit breaker and the bus.

FIG. 17 is an internal configuration diagram when a switchboard door is opened.

FIG. 18 is an internal configuration diagram when a switchboard door is opened and a circuit breaker is removed.

[Explanation of symbols]

2: Busbar unit, 3: Power distribution unit, 9: Circuit breaker, 3
1,34 ... contacts.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toru Tsubaki 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside of Kokubu Plant, Hitachi, Ltd. (72) Inventor Fumio Wakasa 4-6-Canda Surugadai, Chiyoda-ku, Tokyo Address Hitachi, Ltd. (56) References JP-A-57-152627 (JP, A) JP-A-3-74117 (JP, A) JP-A-5-219611 (JP, A) Jpn. (JP, U) Fully open 1983-83668 (JP, U) Fully open 1983-90832 (JP, U) Fully open 1-73735 (JP, U) Fully open, 2-118402 (JP, U) ( 58) Surveyed fields (Int.Cl. ⁷ , DB name) H02B 1/20 H02B 1/30-1/38 H01H 33/53 H02B 11/00

Claims (3)

(57) [Claims] 1. A plurality of compartments for accommodating a plurality of electric devices for each device, the plurality of compartments
A distribution panel, comprising: a common unit provided on the back side in the arrangement direction and accommodating buses arranged in the horizontal direction, wherein the electric equipment in the individual compartment and the buses in the common unit can be separated from each other. . 2. A multiple storage device for accommodating a plurality of electric devices for each device.
Number of compartments and the plurality of compartments
A bus bar that is provided on the back side in the arrangement direction and is arranged in the horizontal direction
In a common unit and multiple compartments
Electrical equipment and the bus in the common unit
Connecting means for allowing mounting and including said connecting means
Connect individual compartments to the common unit
A switchboard, comprising: mounting means for mounting as possible . 3. A plurality of electric devices each having a connection terminal are connected to each device.
Compartments for each
It is installed on the back side of the compartment
A common unit for accommodating the buses arranged in
Terminals, the individual compartments and the common unit.
Mounting means for connecting the knit and the knit so as to be connectable.
The electrical equipment is arranged horizontally by its connection terminals.
The switchboard is detachably attached to the bus bar .