JPH05227612A - Switchboard - Google Patents

Abstract

PURPOSE:To shorten the depth of a switchboard by arranging a first face being made of a row of breakers in height direction and the second face being made by a bus in such a way that they cross each other at right angles. CONSTITUTION:The load unit 11 being the principal unit of a distribution unit is partitioned into two compartments 41 and 60, and a breaker 9 is arranged horizontally inside the compartment 41, and besides, a breaker unit 30 to accommodate the breaker 9 is installed in height direction. The face made by a three-phase bus 24 and the face made by the breaker unit 30 cross each other at right angles. And, the bus 24 and the breaker 9 are detachably connected directly without using a connection conductor by the contact mounted to the breaker 9. The load cable electrically to be connected to an insulated conductor 50 is taken out of the upside of a switchboard, with an upper distribution unit, and is taken out of the downside of the switchboard, with a lower distribution unit. Hereby, the depth of the switchboard can be made small.

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 in which the entire switchboard is downsized.

[0002]

2. Description of the Related Art A switchboard contains equipment such as a circuit breaker, a bus bar, and a cable head, and supplies electric power from a bus bar to a load through the circuit breaker and the cable head. It is known that it is constructed as in Kaisho 60-234404.

[0003]

In many cases, a switchboard is installed in a building, but due to rising land prices in recent years, a small size switchboard that can be installed in a narrower space has been demanded.

Regarding this miniaturization, although the equipment in the switchboard, for example, the circuit breaker has been downsized by adopting the vacuum circuit breaker, in reality, the whole switchboard is still large. By the way, the size of the distribution board that is most popular nowadays is 2.3 meters in height, 1.9 meters in depth, and 0.7 meters in width. Among these, the three-phase circuit breaker for two circuits, the three-phase busbar, Contains a three-phase cable head. The conventional switchboard is such a big one, and the reason why it is unavoidable to make it so large is that in the case of the above-mentioned JP-A-60-234404, a circuit breaker, a bus bar, and a cable head are arranged, and a connection between them is made. It may be said that sufficient consideration has not been given to the fact that they are connected by a conductor and that heat generation due to a large current during normal times or accidents is suppressed to allow smooth heat dissipation.

From the above, it is an object of the present invention to provide a small-sized switchboard by devising the connection or arrangement of the devices in the switchboard.

[0006]

[Means for Solving the Problems] In order to achieve this purpose,
In the present invention, the circuit board is arranged horizontally for three phases in the height direction, and the busbars stretched in the horizontal direction are arranged for three phases in the height direction to connect the circuit breaker and the busbar.

Further, in order to achieve this object, in the present invention, the busbars are double busbars, and the busbars are connected at appropriate points.

[0008]

According to the present invention, the first surface formed by the circuit breaker rows in the height direction and the second surface formed by the busbar are arranged orthogonally to each other, so that the width of the switchboard can be particularly reduced.

Further, according to the present invention, since the busbars are double busbars and current is shunted by connecting the busbars at appropriate points, heat generation due to a large current in a normal time or an accident is suppressed, and heat dissipation is suppressed. It can be done smoothly.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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. The switchboard 1 includes two upper and lower busbar units 2.
And a plurality of rows arranged in two rows (8 in the example in the figure)
The power distribution unit 3 of FIG. The present invention is characterized in 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 busbar unit 2 is fixed and the power distribution unit 3 is separated will be described, but this may be configured such that the power distribution unit 3 is fixed and the busbar 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 is the load unit 1
1, a busbar unit 2, a power receiving unit 4, a busbar communication unit 5, a grounding instrument transformer unit 6, an instrument transformer unit 7, a lightning 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 is an instrument transformer, and 17 is a lightning arrestor, which are detachably attached to the bus bar 10 by an automatic connection disconnecting section 31, respectively.
The load unit 11, which is a main unit of the power distribution unit 3, is connected to the circuit breaker 9, the current transformer 12, the zero-phase current transformer 13 via the automatic connection / disconnection section 31, and the external pull-out unit. It is composed of the cable head 14. The busbar unit 2 is commonly provided to the power distribution units 3 arranged in rows.

FIG. 1 shows the arrangement of devices inside the load unit 11 and the busbar unit 2 which are the main units of the power distribution unit 3, and the power distribution unit 3 and the busbar unit 2 can be separated from each other as described above. It is said that. Inside the busbar unit 2, busbars 24 for three phases extending in the horizontal direction are provided.
Is installed. The load unit 11 is divided into two compartments 41 and 60, the circuit breaker 9 is laterally arranged in the compartment 41, and a circuit breaker unit 30 accommodating a three-phase circuit breaker is installed in the height direction. . The surface formed by the three-phase bus bar 24 and the surface formed by the circuit breaker unit 30 are arranged so as to be orthogonal to each other. And
The busbar 24 and the circuit breaker 9 are detachably directly connected by a contactor attached to the circuit breaker 9 without using a connecting conductor, as will be described later in detail. A load cable is installed in the compartment 60. Compartments 41 and 6
An insulated conductor 50 is provided between 0s. Insulated conductor 50
Is molded resin of a three-phase conductor connected to the load cable and is arranged in the height direction. Insulated conductor 50
As will be described later in detail, the circuit breaker and the circuit breaker 9 are directly detachably connected by a contactor attached to the circuit breaker 9 without using a connecting conductor. The load cable electrically connected to the insulated conductor 50 is taken out to the upper part of the switchboard in the upper power distribution unit and to the lower part of the switchboard in the lower power distribution unit.

According to the present invention, since the horizontal circuit breakers are arranged in the height direction, the horizontal width of the switchboard surface 70 is shortened, and the busbar 24 and the circuit breaker 9 are detached by the contactor without using the connecting conductor. The depth of the switchboard can be shortened by freely connecting directly. Further, since the power distribution unit 3 can be separated from the bus bar unit 2 and the devices (the circuit breaker 9 and the bus bar 24) inside thereof can also be separated, the operation after the installation of the switchboard can be made extremely smooth. For example, it may be desired to change the circuit breaker capacity or the like due to an increase in load, but since the power distribution unit 3 can be removed together with its internal equipment, it can be changed while the other power distribution unit 3 and the bus bar unit 2 are in operation. It is possible. In addition, since it is unitized, it is only necessary to mount the power distribution unit 3 accommodating the equipment of another capacity.

FIG. 4 is an internal view of the lower busbar unit 2 of the busbar units 2 taken along the line AA of the switchboard 1 of FIG. 2, FIG. 5 is an external view of the busbar unit 2, and FIG. 6 is a front view of the busbar unit 2. FIG. 7 is a view showing a cross section taken along the line BB of FIG. 6, in which the busbar unit 2 has a busbar case 21 on the lower support 20.
Is installed. Both ends of the busbar case 21 are bent on the side of the power distribution unit 3 so as to have openings 27 necessary for moving the devices. A hole 28 for fixing the power distribution unit 3 is provided in this bent portion. The double busbars 24 and 25 are attached to the busbar case 21 via the insulator 23.
The double busbars 24 and 25 are both provided so as to extend in the horizontal direction, and a flow dividing piece 26 is provided between the busbars 24 and 25. It is one of the major features of the present invention to employ a structure in which a double busbar is connected and a shunt piece 26 is connected between them, and the operation and effect of this will be described later.

FIG. 8 shows the internal structure of the lower power distribution unit 3 of the power distribution unit 3 in the cross section AA of the power distribution board 1 of FIG. 1, in which the power distribution unit 3 and the busbar unit 2 are located at the cross section CC. It is separably mounted and bolted through holes 28. An insulated conductor 50 is provided by penetrating the compartment 41 and the compartment 60 in the front height direction of FIG. The insulated conductor 50 is a resin molded with a three-phase conductor installed therein, and one end of the three-phase conductor is attached to the load cable 61 in the compartment 60 so as to be separable. The other end of the three-phase conductor of the insulated conductor 50 is detachably directly connected to the circuit breaker 9 in the compartment 41, which 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 breaker 9 is arranged in the height direction. To form the unit 30. Although the example of the drawing is a vacuum circuit breaker, it may be a circuit breaker of another operating principle. Reference numeral 35 denotes a circuit breaker contact drive mechanism, in which the circuit breaker contact opening direction, that is, the circuit breaker axis is horizontal. A busbar-side contactor 31 is provided at the stator-side tip of the circuit breaker 9. Further, a contactor 34 on the insulated conductor 50 side is provided on the side surface of the circuit breaker at the mover side terminal of the circuit breaker. In addition, 36 is a partition which partitions the circuit breakers 9 for insulation.

FIG. 9 shows the connection between the circuit breaker 9 and the bus bar 24 with the insulated conductor 50 removed from the cross section of FIG. Further, FIG. 11 shows the appearance of the connection state between the circuit breaker 9 and the bus bar 24. These contacts 31 are detachably directly connected to the double bus bar 25 without using a connecting conductor. A large current flows from the buses 24 and 25 to the load cable 61 via the circuit breaker 9 in a normal operating state or in the event of an accident. Therefore, in order to reduce the size of the switchboard, it is important to suppress heat generation from these devices or conductors and quickly dissipate the heat generation. According to the present invention, the heat generation from the conductor can be reduced and the heat can be smoothly dissipated by the detachable direct connection and the double busbar. That is, the current in the switchboard is shunted to flow through the circuit breaker 9 from the busbar 24 via the plurality of connecting pieces 26 and the busbar 25, and the amount of heat generated is small and the surface area is increased because the current in each shunt is small. This allows for smooth heat dissipation.

FIG. 12 shows a circuit breaker unit 30 and an 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 to the cable head attachment portion 62. On the other hand,
The other end of the insulated conductor 50 has a circuit breaker connecting portion 32, and a contact 34 on the load side of the circuit breaker 9 is attached.

13 and 14 are sectional views taken along line DD of FIG.
The connection state of each device in the E cross section is shown. FIG.
2, the circuit breaker unit 30 is attached so as to be movable in the direction of the arrow, and in the inserted state, the contacts 31 and 34 are directly detachably connected to the busbar 25 and the insulated conductor 50, respectively. FIG. 15 is an enlarged view showing a connection state between the circuit breaker and the insulated conductor 50. In these figures, the insulated conductor 50
Has an insulating layer 53 formed by molding the three-phase conductor 51 and the load side contact piece 32 with an insulating member. Load side contact piece 32
Are arranged at positions in contact with 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. The vertical conductors 51 of each phase are arranged at predetermined intervals in the moving direction of the circuit breaker, that is, in the depth to reduce the width dimension of the switchboard. When the three-phase vertical conductor 51 and the three-phase load contact piece 32 are brought into contact with each other, the load contact piece 32 of at least two phases is bent so as to reduce the inclination angle inclined in the circuit breaker direction,
The load contact pieces 32 have different heights, but are drawn to the same drawing position. The lower end of the vertical conductor 51 has a load cable chamber 60.
And is connected to the load cable 61 and is integrally resin-molded.

FIG. 9 shows the state in which the circuit breaker 9 is connected to the bus bar 25 (operating position), while FIG. 16 shows the state in which the circuit breaker 9 is pulled out to the surface 70 of the switchboard (disconnection position). ing. FIG. 17 shows a state in which the switchboard door 70 is opened with the circuit breaker 9 still 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 invention, as a result of its very small volume,
It is often thought that inspection and repair inside the power distribution unit became difficult, but as shown in Fig. 18, the circuit breaker unit can be completely pulled out from the power distribution unit, and the power distribution unit itself can be separated from the busbar. This is rarely a problem, because you can.

The switchboard of the present invention is constructed as described above and has the following actions and effects. The circuit breaker 9 has a circuit breaker arranged horizontally and three layers stacked in the height direction to reduce the width direction of the circuit breaker and the switchboard. As a result,
Although the circuit breaker becomes longer in the depth direction, the power source side contactor is detachably arranged directly orthogonal to the busbar 25, and the branch conductor and the insulation mold disconnection part in the conventional switchboard are omitted to reduce the depth dimension. .. Therefore, the volume of the switchboard could be significantly reduced. Further, in the insulated conductor 50, since the three-phase vertical conductors and the load contact pieces are arranged at a predetermined interval in the moving direction of the circuit breaker, the width dimension becomes narrower 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 can be 0.3 meters, and the volume can be reduced to 1/5 at the conventional cost. You can

Further, in the present invention, the power source side contactor of the circuit breaker 9 is detachably directly connected to the double busbar. Therefore, the current from the bus bar 24 flows to the circuit breaker 9 via the shunt section and the connecting bus bar, and the generated heat is reduced, which greatly contributes to the volume reduction of the switchboard. In other words, if the same current as before is applied to each branch of the double bus, it is possible to double the circuit breaker current carrying capacity. It means that it is easy to unitize even the capacity. Also,
According to the present invention, the power distribution board is composed of a plurality of power distribution units 3 and a common bus bar unit, and the power distribution unit 3 has a row panel structure. The power distribution unit 3 and the common bus bar unit can be separated from each other. As a result, it is easy to change the switchboard when the load increases, and the switchboard combination design is facilitated by being unitized.

Some alternative examples of the present invention will be shown below. As described earlier, according to the present invention,
Although the volume ratio can be set to 5, the conventional ratio can be reduced to an appropriate alternative while utilizing the concept of the present invention.

In the present invention, the circuit breakers are placed horizontally and the three phases are stacked in the height direction. However, this is not necessarily intended to be stacked on the same plane, and some circuit breakers are horizontal. They may be arranged separately in the direction. Rather,
In some cases, the circuit breaker may be arranged so that it can be moved in the horizontal direction. In the embodiment, the power source side contactor is in contact with the horizontal bus bar, but when the contact state at this portion deteriorates, it is possible to recover the deterioration of the contact state by shifting the contact position in the horizontal direction. Further, the arrangement of the contact on the load side can be shifted to some extent as on the power supply side.

Further, in the embodiment, the bus bar is stretched in the horizontal direction and the three phases are arranged vertically, but this does not necessarily have to be vertical. Part of it may be displaced in the depth direction. Further, the bus bar and the circuit breaker may not be detachably directly connected but may be connected by a connection conductor having a sufficiently short capacity.

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

Devices such as a grounding instrument transformer, an instrument transformer, and a lightning arrester as a power distribution unit can also be detachably connected directly as in the case of a circuit breaker, with contacts fixed to these devices. It is possible. In the embodiment, the circuit breaker side is the convex portion and the bus bar side is the concave portion for detachable direct connection, but this relationship may be reversed. Although the contactor is attached to the circuit breaker side, it may be possible to have the contactor on the bus bar itself.

[0029]

According to the present invention, since the first surface formed by the circuit breaker rows in the height direction and the second surface formed by the busbar are arranged orthogonally to each other, the width of the switchboard can be particularly reduced. it can.

Further, according to the present invention, since the busbars are double busbars and current is shunted by connecting the busbars at appropriate places, heat generation due to a large current in a normal time or an accident is suppressed and heat dissipation is prevented. It can be done smoothly.

[Brief description of drawings]

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

FIG. 2 is a view showing the overall appearance of a two-stage switchboard according to the present invention.

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

4 is a cross-sectional view taken along the line AA of the busbar unit shown in FIG.

FIG. 5 is an external cross-sectional view of a busbar unit.

FIG. 6 is a front view of a busbar unit.

FIG. 7 is a plan view of a busbar unit.

8 is a cross-sectional view taken along line AA of the busbar unit and the power distribution unit of FIG.

9 is a view showing the cross-sectional view of FIG. 8 with an insulated conductor 50 removed.

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 bar.

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

13 is a cross-sectional view taken along line DD of FIG.

14 is a cross-sectional view taken along line EE of FIG.

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

FIG. 16 is a diagram showing a separated state of a circuit breaker and a bus bar.

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

FIG. 18 is an internal configuration diagram when the switchboard door is opened and the breaker is taken out.

[Explanation of symbols]

2 ... Bus bar unit, 3 ... Power distribution unit, 9 ... Circuit breaker, 3
1, 34 ... Contactors.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number in the agency FI Technical indication location H02B 11/00 A 7028-5G (72) Inventor Toru Tsubaki 1-1-1 Kokubuncho, Hitachi City, Ibaraki Prefecture No. 1 Hitachi Kokubun Factory (72) Inventor Fumio Wakasa 4-6 Kanda Surugadai, Chiyoda-ku, Tokyo Hitachi, Ltd.

Claims (13)

[Claims] 1. A switchboard for accommodating a plurality of busbars and a plurality of circuit breakers, wherein the plurality of circuit breakers are arranged in a stack in the height direction, and the axis of the contact point of each circuit breaker is horizontal, and a plurality of busbars are provided. A switchboard extending in the horizontal direction substantially orthogonal to the axis of the contact of the circuit breaker, and connecting the circuit breaker and the busbar. 2. A switchboard for accommodating a plurality of busbars and a plurality of circuit breakers, wherein a plurality of circuit breakers are stacked in the height direction, and the axis of the contact point of each circuit breaker is the depth direction of the switchboard. A switchboard characterized in that a plurality of busbars are extended in the horizontal direction of the switchboard, and a circuit breaker and the busbars are connected to each other. 3. A switchboard for accommodating a plurality of circuit breakers and a plurality of load-side conductors, wherein a plurality of circuit breakers are arranged in a stack in the height direction, and the axis of the contact point of each circuit breaker is horizontal. The distribution board characterized in that the load side conductor is extended in a vertical direction substantially orthogonal to the axis of the circuit breaker to connect the circuit breaker and the load side conductor. 4. A switchboard for accommodating a plurality of circuit breakers and a plurality of load-side conductors, wherein a plurality of circuit breakers are stacked in the height direction, and the axis of the contact point of each circuit breaker is the depth direction of the switchboard. And a plurality of load-side conductors extending in the height direction of the switchboard to connect the circuit breaker and the load-side conductors. 5. A switchboard for accommodating a plurality of busbars, a plurality of circuit breakers, and a plurality of load-side conductors, wherein a plurality of circuit breakers are arranged in a stack in the height direction, and an axis of a contact point of each circuit breaker is arranged. Horizontally, multiple busbars extend in a horizontal direction that is substantially orthogonal to the circuit breaker axis, and multiple load-side conductors extend in a vertical direction that is substantially perpendicular to the circuit breaker axis, between the circuit breaker and the busbar, and between the circuit breaker. A switchboard characterized by connecting a load-side conductor. 6. A switchboard for accommodating a plurality of busbars, a plurality of circuit breakers, and a plurality of load-side conductors, wherein a plurality of circuit breakers are stacked in the height direction, and the axis of the contact point of each circuit breaker is arranged. In the depth direction of the switchboard, multiple busbars are extended horizontally in the switchboard, multiple load-side conductors are extended in the heightwise direction of the switchboard, and the circuit breakers and busbars are connected, and the circuit breaker and load-side conductors are connected. And switchboard. 7. A switchboard in which a plurality of units for housing a plurality of bus bars, a plurality of circuit breakers, and a plurality of load-side conductors are arranged in parallel, and the plurality of circuit breakers in each unit are arranged in a height direction. Arranged in piles, the axis of the contact of each breaker is horizontal, a plurality of busbars are provided in common to a plurality of units, and a plurality of busbars are extended in a horizontal direction substantially orthogonal to the axis of the breaker, A switchboard comprising: a plurality of load-side conductors extending in a vertical direction substantially orthogonal to an axis of a circuit breaker, and connecting the circuit breaker and a bus bar, and connecting the circuit breaker and the load-side conductor circuit breaker. 8. A switchboard in which a plurality of units for accommodating a plurality of bus bars, a plurality of circuit breakers, and a plurality of load-side conductors are arranged in parallel, and a plurality of circuit breakers in each unit are arranged in a height direction. Arrange them in a stack, with the axis of the contacts of each breaker as the unit depth direction,
A plurality of busbars are extended in the horizontal direction of the unit and a plurality of busbars are provided in common to a plurality of units, and a plurality of load-side conductors in each unit are extended in the height direction of the unit, and between the circuit breaker and the busbars and the circuit breaker. A switchboard characterized by being connected to a load-side conductor. 9. A switchboard in which a plurality of units for accommodating a busbar, a circuit breaker, and a load-side conductor are juxtaposed, wherein the busbar extending direction, the load-side conductor extending direction, and the circuit breaker axial direction are mutually opposite. A switchboard that has a substantially right-angled directional relationship and has a busbar extending direction in which the units are juxtaposed. 10. An electric circuit comprising two sets of electric buses, a connecting conductor connecting the electric buses at a plurality of points, and an electric device connected to one of the electric buses between the connecting conductors. 11. An electric circuit comprising a main bus, a branch bus connecting two different points of the main bus, and an electric device connected to the branch bus. 12. A switchboard for accommodating an electrically connected busbar and an electric device, wherein a plurality of electric busbars are connected at a plurality of locations by connection conductors.
A switchboard in which electrical equipment is connected to one of the electric busbars between the connecting conductors. 13. A switchboard for accommodating an electrically connected busbar and an electrical device, wherein two different points of the main busbar are connected by a branch busbar, and the electrical device is connected to the branch busbar.