JPH11341614A - Bus unit and switchboard using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make connection buses to be easily assembled to an enclosure in a short time and, in addition, to improve the safety when load-side cables are assembled to the enclosure. SOLUTION: A bus unit is provided with a plurality of connection buses 9 which have such lengths that the buses 9 can be used commonly to unit trucks arranged in a plurality of stages in an enclosure and are connected to power supply buses in a plurality of phases, a bus supporting member 6 detachably attached to the enclosure at the position facing the unit trucks, and a plurality of insulated holding bodies 8 which hold the buses 9 on the supporting member 6 and the supporting member 6 is constituted in the bus unit by attaching the porcelain tubes 7 of conductors for load connected to load cables to the member 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bus unit incorporated in a closed switchboard having a unit circuit device such as a circuit breaker, and a switchboard using the same.

[0002]

2. Description of the Related Art FIG. 21 is a longitudinal sectional side view of a conventional switchboard of a closed type. In this conventional switchboard, a front portion in a grounded metal box 100 is partitioned into a plurality of steps by a horizontal partition wall 101, and accommodating chambers 102 are provided. A wiring chamber 106 is provided, which is partitioned by a vertical partition 105 having a load insulator 104 and communicates vertically, and a power bus room 108 is provided above the wiring chamber 106 via a horizontal partition.

FIG. 22 is an enlarged perspective view of a conventional unit truck housed in the housing chamber. This unit truck 10
Reference numeral 7 denotes a circuit breaker having a power supply conductor and a load conductor.

One end of the power supply bus 1 is provided in the wiring chamber 106.
08 is connected to the three-phase power supply bus 109, the other end is connected to the power supply conductor inserted through the power supply insulator 103, one end is connected to the load side, and the other end is connected to the load side. A load cable 111 connected to the load conductor inserted through the load insulator tube 104 is provided.

[0005] The bus cable 110 is connected to the cable holder 1.
12, which is held on the inner surface of the side wall of the box 100 so that the connection with the load conductor of the load cable 111 can be easily performed. Further, a bus cover covering the bus cable 110 is attached to the side wall, At the time of assembling 111, the connecting portion of the bus cable 110, which is a high-voltage charging portion, is prevented from being accidentally touched.

In the switchboard constructed as described above, when the unit truck 107 is inspected, the unit truck 107 is pulled out and moved to the front side of the box, thereby connecting the busbar cable 110 to the power supply conductor and the load cable. 11
The connection with the first load conductor is surely disconnected, and the voltage of the unit truck 107 can be made zero, so that an electric shock accident of the inspection operator due to the residual voltage of the unit truck 107 can be prevented.

[0007]

However, as described above, in the conventional switchboard, power is supplied from the power supply bus 109 to the unit truck 107 by using the load cable 111 to supply power from the unit truck 107 to the load. As in the case, since the bus cable 110 is used, when assembling the switchboard, a plurality of insulators 103 for the power supply and insulators 104 for the load are mounted on the partition wall in the box 100 in a narrow space in the box 100. Attachment, and furthermore, the plurality of bus cables 110 are bent by the cable attachment tool 112 while securing an electrical distance between the cables, and attached to the side surface inside the box.

Accordingly, the time required for assembling the switchboard is prolonged, and the efficiency of the assembling work is poor.
06, it was necessary to be careful not to touch the connection of the bus cable 110, which is a high-voltage charging unit, when assembling the load cable 111.

The present invention has been made in view of such circumstances, and a connecting bus bar having a length common to each unit truck and a load insulator tube are attached to a bus bar supporting member detachably attached to a box body. Accordingly, it is an object of the present invention to provide a bus unit which can be easily assembled in advance outside the box body, and the busbar supporting member of the bus unit is mounted in the box body, thereby facilitating the assembly of the switchboard. It is another object of the present invention to provide a switchboard which can be performed in a short time, and which can enhance the safety at the time of assembling a load cable by using a busbar supporting member instead of a partition.

[0010]

A bus bar unit according to the first invention has a length common to unit trucks arranged in a plurality of stages in a box, and is connected to power buses of a plurality of phases. A plurality of connection buses, a bus support member detachably attached to a position facing the unit truck in the box, and a plurality of insulating holders holding the connection buses on the bus support member. And a bus conductor supporting member is provided with a porcelain insulator of a load conductor connected to a load cable.

A bus unit according to a second aspect of the present invention includes a bus cover that covers the connection bus.
It has a first insertion hole through which a power conductor for connecting the unit truck and the connection bus is inserted, and a second insertion hole through which an insulator tube of the load conductor is inserted. It is characterized in that it is deviated from one insertion hole in a direction crossing the length direction of the connection bus.

According to a third aspect of the present invention, there is provided a switchboard having a plurality of unit trucks arranged in a plurality of stages in a box, and having a length common to the unit trucks and connected to a plurality of phases of power supply buses. A plurality of connection buses, and a bus support member in which the connection buses are supported via a plurality of insulating holders. In the bus support member, a porcelain insulator of a load conductor connected to the load cable is provided. The attached bus bar unit is detachably attached to a position facing the unit truck in the box.

In a switchboard according to a fourth aspect of the present invention, the bus unit includes a bus cover for covering the connection bus, and the bus cover is provided with a power supply conductor for connecting the unit truck and the connection bus. (1) an insertion hole, a second insertion hole through which the insulator of the load conductor is inserted, and a position holding hole are provided, and the unit truck can be drawn out and moved along a predetermined guide member in the box body; The unit carriage is provided with a projection fitted into the position holding hole.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. First Embodiment FIG. 1 is a perspective view of a bus unit with a bus cover removed, FIG. 2 is a perspective view of a bus unit, FIG. 3 is a perspective view of a bus unit connected to a power supply bus, and FIG. 4 is a schematic view of a switchboard. FIG. 5 is a perspective view of a switchboard, FIG. 6 is a perspective view of a state in which one of the unit trucks is pulled out, and FIG. 7 is a perspective view of a housing chamber of the box.

As shown in FIGS. 4 to 6, the closed type switchboard has a rectangular box-shaped metal box 1 which is long vertically and is divided into four steps by three horizontal partition walls 11. As shown in FIG. Accommodation room 12
Are formed as wiring chambers 13 that are vertically continuous behind the housing chambers 12. A power bus chamber 15 partitioned by a horizontal partition 14 is formed above the wiring chambers 13. The storage chambers 12 are opened / opened on the front surface of the box 1.
A lid 16 to be closed is attached. Each accommodation room 12
A pair of rails 17, 17 (guide members) extending in the front-rear direction are provided at the bottom of the three-phase power supply conductors 2 as shown in FIG.
.. And a unit truck 4 using a circuit breaker having three load conductors 3... Are individually supported so that they can be pulled out and moved. In addition, the unit truck 4 ...
As shown in FIG. 6, by attaching an adapter for the extension rails 18, 18 to the front ends of the rails 17, 17, it can be pulled out to the front of the box 1.

One end of the wiring chamber 13 is connected to the load side on the rear side in the front-rear direction, and the other end is connected to each of the unit trucks 4.
A total of twelve three-phase load cables 20... Connected to... Are held by a cable holder 21, and a bus unit A is detachably attached to the front side in the front-rear direction.

The busbar unit A includes a busbar support member 6 which is detachably mounted on a pair of vertically long mounting members 5 and 5 fixed to the left and right sides of the wiring chamber 13 in the box 1.
And twelve load insulator pipes 7 through which the load conductors 3 are inserted and three insulating holders 8.
, Three connection buses 9... For three phases having a length common to the unit carriages 4, and a bus cover 10 covering the connection buses 9. The load insulators 7 are attached to the bus supporting member 6, and the insulating holders 8 are provided between the bus cover 10 and the bus supporting member 6.
Are mounted, and the connection buses 9... Are detachably held by the insulating holders 8.

Each of the connecting buses 9 is formed by using a band plate as shown in FIG. 1, and the upper end thereof is bent at right angles in the plate thickness direction to provide a bent piece 9a. To Bridge Bus 2
2 is connected by a screw body, and the other end of the bridging bus 22 is connected by a screw body to a power bus 23 provided in the power bus chamber 15 via an insulator.

The mounting members 5 and 5 are formed in a U-shape in plan view, and the side surface connecting the opposing pieces is fixed to the inner surface of the side wall of the box 1.

FIG. 8 is an enlarged cross-sectional view of the insulating holder, and FIG. 9 is a perspective view of the insulating holder. Insulating holder 8 ...
, A first support 81 having a holding recess 81a for receiving one end in the width direction of the three connection buses 9, a butting projection 81b, and a pair of screw insertion holes 81c;
And a second support 82 having a holding recess 82a for receiving the other end in the width direction, a butting projection 82b, and a pair of screw insertion holes 82c.
The two screw bodies 83, 83 inserted into the screw insertion holes 81c, 82c of the 82 are fastened to the screw holes 6a drilled in the busbar support member 6 to be attached in a sandwiching manner.

The busbar support member 6 and the busbar cover 10 are formed of rectangular plates, and the busbar cover 10 is formed longer than the busbar support member 6 as shown in FIG. 6 is projected downward.

The busbar support member 6 has three pairs of screw holes 6a and three second insertion holes 6b into which the load insulators 7 are inserted at three positions vertically spaced apart from each other. Are provided in the peripheral portion, and eight first mounting holes 6c are provided in the peripheral portion, and mounting screws 24 inserted through the first mounting holes 6c are screwed into the mounting members 5 and 5. The busbar support member 6 is detachably attached by tightening the busbar support member 6 (not shown).

The busbar cover 10 has three first insertion holes into which the power supply conductors 2... Of the unit trucks 4. 10a
The three second insertion holes 6b into which the load insulators 7 are inserted are formed so as to be deviated in the width direction, in other words, in the direction crossing the length direction of the connection bus 9. . That is, the first insertion holes 10a are formed at positions corresponding to the connection buses 9..., And the second insertion holes 6b. Biased towards
Insulator tube 7 for each load without interfering with connection bus 9
Can be inserted into the second insertion hole 6b.

On both sides in the width direction of the busbar cover 10, a plurality of position holding holes 10b into which positioning protrusions 4b provided at the rear part of the truck body 4a of each unit truck 4 are fitted. .. Are provided corresponding to the unit trucks 4. Further, six second mounting holes 10c... Are provided in the periphery of the busbar cover 10, and mounting screws 25 inserted into these second mounting holes 10c. The busbar cover 10 is detachably attached by tightening the screw holes to be provided.

FIG. 11 is an enlarged sectional view of the load insulator, and FIG. 12 is an exploded perspective view of the load insulator. The load insulator tubes 7... Correspond to the upper three-stage unit trucks 4.
As shown in FIG. 4, the busbar cover 10 is inserted through the insertion hole 6b and the second insertion hole 6b of the busbar cover 10 and attached by a tightening screw 26, and corresponds to the lowermost unit truck 4.
Through the second insertion hole 6c.

Between the pair of load insulators 7 attached to the bus support member 6 and the bus cover 10, both ends of a cylindrical insulating sleeve 71 are inserted to connect the load insulators 7. The blades 3a that constitute a part of the load conductors 3 are provided at one end in the load insulator tubes 7 and the insulating sleeve 71.

The blade 3a is fixed by a mounting screw 29 to a bracket 28 fixed by a mounting screw 27 inside a load insulator 7 attached to the busbar support member 6.

FIGS. 13 and 14 show the assembling order of the busbar unit. FIG. 13 is a first assembly process diagram, and FIG. 14 is a second process diagram. When assembling the busbar unit A, an assembling jig B having a size corresponding to the busbar support member 6 is used in order to align the intervals between the connection busbars 9... And the positions of the bent pieces 9a at the upper end. The assembling jig B is provided with a pair of stoppers B1 with which the lower end of the busbar support member 6 abuts on the upper surface at one end thereof. Two stoppers B2 are provided.

On the upper surface of the assembly jig B, the busbar supporting member 6 is placed sideways and its lower end is brought into contact with the first stopper B1. A bent piece 6d is provided at an upper end of the busbar supporting member 6, and the bent piece 6d comes into contact with the assembling jig B so that the busbar supporting member 6 can be lifted from the upper surface of the assembling jig B. Like that. In a state in which the busbar supporting member 6 is raised, as shown in FIG.
Into the second insertion holes 6c, and connect the flanges thereof with the tightening screws 26.
To the busbar support member 6.

Next, three first supports 81... Are placed at positions corresponding to the screw holes 6 a of the busbar supporting member 6, and three connection portions 81 a are held in the holding recesses 81 a of these first supports 81. The lower end of the bus 9 is the second stopper B2.
Then, the second support 82 is brought into contact with the first support 81, and the holding recess 82a thereof is inserted into the connection busbar 9.
Two screw bodies 8 are inserted into the screw insertion holes 81c and 82c of the
3 and 83, and the threaded ends of these screw bodies 83 and 83 are fastened to the screw holes 6a of the busbar support member 6 so that the connection busbars 9 are connected to the first and second supports 81 and 8.
Install it with 2.

FIG. 15 is an explanatory view showing a state where the bus unit is assembled to the box. The busbar unit A assembled as shown in FIG. 14 is inserted into the box 1 along the pair of mounting members 5 and 5 inside the box 1 with the box 1 lying down, 1 The mounting screw 24 inserted into the mounting hole 6c is removably mounted by tightening the mounting screw 24 into a screw hole formed in the mounting members 5 and 5.

Next, as shown in FIG. 10, the blade 3a is attached to the load insulator 7 on the side of the bus support member 6, and the insulating sleeve 71 is inserted into the insulator 7 for load.
0 into the box 1 and the second
The porcelain tube 7 for load is inserted into the insertion hole 6b, and its flange is fixed to the busbar cover 10 with the tightening screw 26. In addition, the mounting screw 25 inserted into the second mounting hole 10c of the busbar cover 10
Is removably mounted by tightening the screw into a screw hole formed in the mounting members 5 and 5.

The bent pieces 9a of the three-phase connection buses 9 in the bus bar unit A mounted on the box 1 as described above.
The power supply bus 23 is connected by a bridge bus 22 as shown in FIG.

FIG. 16 is an enlarged perspective view of the unit truck.
FIG. 17 is an enlarged perspective view of an insulating bushing portion of the unit truck. The unit truck 4 is composed of a front cover 4c having a handle at the front end of a truck body 4a having wheels 41 on the left and right sides, a pull-out lever 42, and an electromagnetic contactor 4.
3 are provided, and the first and second support tables 4d, 4
e is provided. A control connector 44 is provided on the front cover 4c.
And a changeover switch 45 and the like. First support 4d
Include three insulating bushings 47 for three phases having terminals 46 for a power source in contact with the connection buses 9.
.. And the instrument transformer 48 are supported, the power fuse 50 is held in each of the insulating bushes 47 via a fuse holder 49, and the power fuse 50 and the electromagnetic contactor 43 are connected by a conductor. In addition, an inter-phase barrier 51 is provided between the insulating bushings 47. An instrument current transformer 53 having a load terminal 52 in contact with the blade 3a is supported on the second support 4e, and the instrument current transformer 53 and the electromagnetic contactor 43 are connected by a conductor. I have.

Second Embodiment FIG. 18 is a perspective view of a main part showing a second embodiment of a bus unit. In the second embodiment, at least one through hole 54 is provided on the side surface of each of the mounting members 5 and 5 to which the busbar supporting member 6 is mounted, and the other configuration and operation are the same as those of the first embodiment. Therefore, the same reference numerals are given to the common parts, and the detailed description and operation thereof are omitted.

The mounting members 5 and 5 according to the second embodiment are
The through holes 54 are provided in the side surfaces of the mounting members 5, 5, that is, the side surfaces of the mounting members 5, 5 formed in a U-shape in plan view. Therefore, the heat inside the bus unit A, in other words, the mounting members 5 and 5
The heat of the connection bus chamber between the bus support member 6 and the bus cover 10 attached to the connection bus can be satisfactorily released from the through hole 54, and the maintenance of the connection bus chamber can be easily performed from the through hole 54. Can be.

Third Embodiment FIG. 19 is a perspective view of a main part showing a third embodiment of the busbar unit. In the third embodiment, a wiring duct 55 extending vertically is attached to a side surface of the mounting members 5, 5 to which the busbar supporting member 6 is mounted by a holder 56.
A control line 5 connected between each unit truck 4...
7 to protect the control line 57. Other configurations and operations are the same as those of the first embodiment. Detailed description and operation are omitted.

The mounting members 5 and 5 according to the third embodiment are
It is fixed at the required distance from both side walls. In the third embodiment, the control line 57 can be well protected by the wiring duct 55.

Fourth Embodiment FIG. 20 is a vertical sectional side view of a switchboard in which a bus unit is incorporated. In the fourth embodiment, the unit carts 4.
Since they are arranged in stages and other configurations and operations are the same as those of the first embodiment, the same reference numerals are given to the common components, and detailed description and operations thereof are omitted. In this way, the unit carts 4...
The number of stages may be five or more.

The bus cover 10 according to the first to third embodiments.
Is attached to the attachment members 5 and 5 fixed to the box 1, but may be directly attached to the busbar support member 6.

In the first to third embodiments described above, the bus bar supporting member 6 and the bus bar cover 10 made of a rectangular plate are used.
Is configured to be detachably attached to the attachment members 5 and 5 fixed to the box 1. In addition, the attachment members 5 and 5 can be attached to and detached from the box 1. , 5 may be configured so that the rectangular plate body is attached to the bus bar supporting member 6, and the bus bar supporting member 6 is detachably attached to the box 1. In this case, the busbar cover 10 can be attached to the attachment members 5 and 5 in advance.

[0042]

According to the bus unit according to the first invention,
A connecting busbar and a load insulator tube having a length common to the unit trucks can be held in advance on the busbar supporting member detachably attached to the box body outside the box body. The bus unit provided with the insulator tube can be easily and quickly assembled.

According to the bus unit according to the second aspect of the invention, when the unit truck is assembled in a box of a switchboard configured to be drawn out and moved, the unit truck is not hindered by a load insulator tube. The power supply conductor can be inserted into the first insertion hole of the busbar cover, and can be reliably brought into contact with the connection busbar.

According to the switchboard according to the third aspect of the present invention, the busbar unit pre-assembled outside the box body is inserted into the box body and the busbar support member is attached to the box body, so that the connection busbar and the insulator for load are installed. Can be easily assembled in a short time, the work efficiency of the assembly can be increased, and the cost can be reduced. Further, since the busbar supporting member can also serve as a partition and divide the inside of the box into a connection busbar chamber and a load cable chamber, the safety at the time of assembling the load cables can be improved.

According to the switchboard of the fourth aspect, when the unit truck is moved toward the busbar unit, the protrusion of the truck is fitted into the position holding hole of the busbar cover, and the position of the unit truck within the box body is adjusted. Because it can be held well
The power supply conductor can be satisfactorily inserted into the first insertion hole of the busbar cover, and can be reliably brought into contact with the connection busbar.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bus unit according to the present invention with a bus cover removed.

FIG. 2 is a perspective view of a bus unit according to the present invention.

FIG. 3 is a perspective view in which a connection bus of the bus unit according to the present invention is connected to a power supply bus.

FIG. 4 is a longitudinal sectional side view schematically showing a switchboard according to the present invention.

FIG. 5 is a perspective view of a switchboard according to the present invention.

FIG. 6 is a perspective view showing a state in which one of the unit trucks of the switchboard according to the present invention is pulled out.

FIG. 7 is a perspective view of the inside of the accommodation room of the box of the switchboard according to the present invention.

FIG. 8 is an enlarged cross-sectional view of an insulating holder portion of the bus unit according to the present invention.

FIG. 9 is a perspective view of an insulating holder of the bus unit according to the present invention.

FIG. 10 is a cross-sectional view of a porcelain tube portion for a load of the bus bar unit according to the present invention.

FIG. 11 is an enlarged sectional view of a porcelain tube portion for a load of the bus bar unit according to the present invention.

FIG. 12 is an exploded perspective view of a load insulator tube portion of the busbar unit according to the present invention.

FIG. 13 is a first assembly process drawing of the bus bar unit according to the present invention.

FIG. 14 is a second assembly process drawing of the busbar unit according to the present invention.

FIG. 15 is an explanatory view showing a state where the bus bar unit according to the present invention is assembled to a box.

FIG. 16 is an enlarged perspective view of a unit truck of the switchboard according to the present invention.

FIG. 17 is an enlarged perspective view of an insulating bushing portion of the unit truck of the switchboard according to the present invention.

FIG. 18 is a perspective view of a main part of a switchboard according to Embodiment 2 of the present invention.

FIG. 19 is a perspective view of a main part of a switchboard according to Embodiment 3 of the present invention.

FIG. 20 is a longitudinal sectional side view of another embodiment schematically showing the switchboard according to the present invention.

FIG. 21 is a vertical sectional side view schematically showing a switchboard showing a conventional example.

FIG. 22 is an enlarged perspective view of a unit truck of a switchboard showing a conventional example.

[Explanation of symbols]

1 Box, 2 Power supply conductor, 3 Load conductor, 4
Unit trolley, 6 busbar support members, 7 load insulator,
8 Insulation holder, 9 Connection bus, 10 Bus cover, 2
0 Load side cable, 23 Power bus, 4b protrusion, 6
b 2nd insertion hole, 10a 1st insertion hole, 10b position holding hole.

Claims (4)

[Claims] 1. A plurality of connection buses having a length common to unit trucks arranged in a plurality of stages in a box body and connected to power supply buses of a plurality of phases, and a unit in the box body A bus support member detachably attached to a position facing the cart, and a plurality of insulating holders holding the connection buses on the bus support member; and the bus support member includes A busbar unit, comprising a porcelain insulator of a load conductor connected to a load cable. 2. A bus cover for covering the connection bus, the bus cover being provided with a first insertion hole through which a power supply conductor connecting the unit truck and the connection bus is inserted, and a load conductor. The busbar unit according to claim 1, further comprising a second insertion hole through which the porcelain tube is inserted, wherein the second insertion hole is biased with respect to the first insertion hole in a direction crossing the length direction of the connection bus. . 3. A unit truck arranged in a plurality of stages in a box body, a plurality of connection buses having a length common to these unit trucks and connected to a plurality of phases of power supply buses, A bus support member having these connection buses supported via a plurality of insulating holders; and a bus unit having a load conductor insulator attached to the load cable attached to the bus support member. A switchboard, which is detachably attached to a position facing the unit truck in the box. 4. The busbar unit includes a busbar cover that covers the connection busbar, the busbar cover includes a first insertion hole through which a power supply conductor connecting the unit truck and the connection busbar is inserted, and A second insertion hole and a position holding hole through which a porcelain tube of a load conductor is inserted are provided, and the unit truck can be pulled out and moved along a predetermined guide member in the box body. The switchboard according to claim 3, further comprising a projection fitted into the position holding hole.