JP5992211B2 - Switchgear - Google Patents

Description

  The present invention relates to a switch gear used for, for example, power transmission / distribution and power receiving equipment, and more particularly to a busbar connection structure in a case where a plurality of panels are arranged in a row.

  As an internal configuration of a conventional general switchgear, for example, a drawer type circuit breaker is accommodated in two upper and lower stages in a casing, and a three-phase main busbar is arranged in the horizontal direction in the horizontal direction at the center of the back of the circuit breaker. One terminal of each circuit breaker is connected to the main bus line via a branch conductor, and the other terminal of each circuit breaker is connected to an external cable drawn from the lower side of the casing. In addition, a switchgear having a configuration that simplifies support of the main busbar by sandwiching a three-phase main busbar between a pair of insulators and fixing the insulator to the frame of the housing is disclosed (for example, Patent Documents). 1).

JP 2000-333313 A (page 4, FIG. 3)

The external cable connected to the main circuit of the switch gear is drawn into the switch gear from the cable drawing portion provided on the ceiling or floor surface of the switch gear according to the situation of the site where the switch gear is installed. The terminal processing of the external cable requires a predetermined terminal processing size suitable for the type and size of the cable.
In the switchgear as in Patent Document 1, if the lead-in portion of the external cable is on the ceiling side, the height of the housing is increased, or the arrangement positions of both circuit breakers and the main bus are moved downward as a whole. It is necessary to secure the terminal dimensions of the external cable.
It was difficult to reduce the height of the switch gear in order to configure the switch gear after determining the common main bus standard position by the upper and lower pull-in.
In addition, when the arrangement position of the main bus bar is lowered, the height of the main bus bar of the other boards in the line is different. For this reason, it is necessary to convert the height of the main bus position between panels, but when this is done with air insulation, it is necessary to change the height while ensuring the air insulation distance between the bus phases. Therefore, there is a problem that the width of the switch gear becomes large.

  The present invention has been made to solve the above-described problems, and is easy even when the arrangement height of the bus bars differs between the panels depending on the pull-in direction and the cable size of the external cable of the switch gears arranged in a row. The object is to provide a switchgear that can cope with the above.

The switchgear according to the present invention includes a plurality of panels in which a plurality of panels containing three-phase main busbars arranged horizontally, a circuit breaker, and an external cable connected to the circuit breaker are arranged, and adjacent boards Switch buses constructed by connecting the main buses of the two main buses adjacent to each other in the positions where the main bus bars are arranged at different heights are bent in the same step as the difference in arrangement height. the busbar connection unit bent portion of the stepped connection bus stepped connection bus leaving its connection part is formed on one body with the insulating member, those which are connected.

According to the switchgear of the present invention, the main buses in the places where the boards having different main bus arrangement heights are adjacent to each other are connected to the three-phase stepped connection buses bent at the same step as the difference in arrangement height. leaving since the bent portion of the stepped connecting bus bars are connected by bus connection unit formed on one body by an insulating member, different pull direction and cable sizes for external cables switchgear constructed panel array, the main bus When the arrangement height from the floor is different between adjacent panels, the switchgear can be easily reduced without enlarging the switchgear housing, and the switchgear can be reduced.

FIG. 4 is a row board configuration diagram showing an example of an arrangement of switch gears according to Embodiment 1 of the present invention in a block skeleton. It is a figure which shows the arrangement | positioning of the circuit breaker of a switch gear corresponding to FIG. It is side surface sectional drawing of the principal part of FIG. It is a figure which shows the 1st Example of the bus-line connection unit of FIG. It is a figure which shows the 2nd Example of the bus-line connection unit of FIG. It is a figure which shows the 3rd Example of the bus-line connection unit of FIG. It is a figure which shows the 4th Example of the bus-line connection unit of FIG. It is a figure which shows the 5th Example of the bus-line connection unit of FIG.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing the arrangement of switch gears arranged in a row on a block skeleton, and shows only the configuration related to the present invention.
First, referring to FIG. 1, the overall configuration of switch gears arranged in a row will be described. The drawing shows an example in which the lead-in board 1 into which the high-voltage power source is drawn and the feeder boards 2 to 4 are arranged in a row. The feeder board 2 is a cable upper drawer, and the feeder boards 3 and 4 are cable lower drawer boards. Each panel accommodates a circuit breaker 5 for turning on and off the main circuit, and one end of the circuit breaker 5 is connected to a main bus 6 provided through each panel. In each of the feeder boards 2 to 4, two breakers 6 are accommodated.

  Electric power is supplied to the lead-in board 1 from the host system and passed to the main bus 6 via the circuit breaker 5 mounted on the lead-in board 1. In the feeder panel 2 that receives power through the main bus 6, power is supplied from the ceiling side of the panel housing to the switch gear group (not shown) of another arrangement via the circuit breaker 5 by the external cable 7. Similarly, in the feeder boards 3 and 4, power is supplied to the switch gear groups in other arrangements from the floor side of the board housing via the circuit breaker 5 by the external cable 7. The distance between the lead-in portion of the external cable 7 to the housing and the connection portion of the circuit breaker 5 needs to secure a terminal dimension for cable terminal processing according to the size of the external cable 7.

FIG. 2 is a diagram showing an arrangement of the circuit breaker 5 and the main bus 6 corresponding to the block skeleton of FIG. The part corresponding to the drawing board 1 of FIG. 1 is the drawing board 1a, and similarly, the parts corresponding to the feeder boards 2 to 4 are feeder boards 2a to 4a. Since the main bus 6 has three phases, each phase is indicated by 6a, 6b, 6c. The main buses 6a, 6b, 6c between the panels are connected by inter-board connection buses 8a, 8b, 8c.
Here, the combination of the circuit breaker 5 and the main buses 6a to 6c accommodated in each panel is unitized as the same configuration from the viewpoint of standardization. The two circuit breakers 5 accommodated in the feeder boards 2a to 4a are stacked in the vertical direction, and the three-phase main buses 6a to 6c are arranged in the horizontal direction when viewed from the front side on the back side of the intermediate part. These are arranged with a distance between phases, and the relationship of this part is common to each board. Moreover, the drawing-in board 1a should just remove | exclude the circuit breaker 5 of the upper stage side from this unit.

The feeder panel 4a shows a case where the outside cable size is large. As explained above, since the terminal processing dimensions for cable processing according to the cable size are required, a unitized circuit breaker is used to secure the terminal distance of the external cable drawn from the floor side of the housing. 5, the height of the main buses 6a to 6c is increased, and the terminal processing dimensions for the external cable 7 connected to the lower circuit breaker 5 are secured.
When the unit height of the circuit breaker 5 and the main buses 6a to 6c accommodated in the feeder panel 4a is increased, the adjacent buses arranged in a row, in the case of the figure, the buses with the main buses 6a to 6c of the feeder board 3a The height will be different. For this reason, in order to connect the buses having different arrangement heights, the bus bar connecting unit 9 is provided, and the height conversion is performed by the bus bar connecting unit 9 is a characteristic part of the present application.

Here, if it is necessary to increase the distance for terminal processing due to the convenience of the external cable in the upper drawer feeder board, the unit height of the circuit breaker 5 and the main buses 6a to 6c is set to the feeder board 4a. Is shifted downward, and the bus bar connecting unit 9 is turned upside down with the board width direction as an axis, so that the feeder board 4a is upside down and the terminal distance from the ceiling side can be secured. It is configured to be able to.
1 and 2 show an example, and the number of boards and the order of arrangement are not limited to the drawings. By appropriately combining the bus connection units 9 and changing the vertical direction in accordance with the board configuration arranged in the row, it is possible to widely cope with various row arrangements.
Moreover, although the circuit breaker 5 has shown the case of two-stage stacking, it is not limited to this. However, in the case of two-stage stacking, the two breakers 5 and the three-phase main buses 6a to 6c can be easily set as shown in the figure, and the effect can be further exhibited.

3A is a side sectional view of the feeder board 3a of FIG. 2, and FIG. 3B is a side sectional view of the feeder board 4a of FIG. In either case, the external cable 7 is not shown. One end side of the upper circuit breaker 5 is connected to the external cable 7 by the main circuit connection part 10a, and the lower circuit breaker 5 is connected to the external cable 7 by the main circuit connection part 10b. The other end sides of both circuit breakers 5 are connected to respective phases of three-phase main buses 6a, 6b, 6c through connecting conductors 11.
The heights of the circuit breaker 5 and the main buses 6a to 6c in (a) are standard positions. The height of the circuit breaker 5 and the main buses 6a to 6c in (b) is increased in overall arrangement in order to secure a distance for terminal processing of the external cable 7 connected to the lower circuit breaker 5. .

  FIG. 4 shows an embodiment of the busbar connection unit 9. (A) is the front view seen in the same direction as FIG. 2, (b) is the side view, (c) is a bottom view. As shown in the figure, the busbar connection unit 9 includes three-phase stepped busbars 12a, 12b, and 12c that connect main busbars between boards having different busbar heights arranged at both ends in the length direction. Three-phase integral molding is performed by an insulating member 13 made of an insulating material such as epoxy, leaving the connection portion. The stepped connection buses 12a to 12c are made of conductive flat plates having a rectangular cross section, and are formed by being stepped and bent so as to match the busbar height of the adjacent board. In actual production, a rectangular flat plate may be bent in the width direction, or may be cut out from the flat plate.

The stepped connection buses 12a to 12c are connected to the main busbars of the adjacent panels at the connection portions at both ends by bolting, but the bolt holes are not shown.
Further, when the busbar connection unit 9 is incorporated in the board casing, both ends in the longitudinal direction of the insulating member 13 are fixed to the frame of the board casing by bolting or the like, but the bolt holes are not shown. Absent.
An opening is provided in the side wall of the housing through which the busbar connection unit 9 penetrates according to its size.

  The interphase insulation of the stepped connection buses 12a to 12c is ensured by the insulating member 13 inside the molded insulating member 13, but a creeping insulation distance is required for the air portion, so that the pleat portion 13a, And the creeping insulation distance is ensured by integrally forming the pleat portion 13b on the surface of the insulating member 13 when the insulating member 13 is molded. As for the insulation between the ground, the creeping length is secured by the pleat portions 13 a provided in the vicinity of both end portions in the longitudinal direction of the insulating member 13. In the following description, a portion other than the pleat portion of the insulating member 13 is referred to as a “main body portion”.

Thus, the connection bus and the insulating member surrounding the connection bus are integrally formed as the bus connection unit 9 so that the height and width of the panel constituting the switchgear are almost the same as the conventional one, and the height of the circuit breaker 5 and the main bus 6 is high. Since the external cable 7 can be connected by moving up and down, the switchgear panel height can be reduced. In actual application, if the bus connection unit 9 is standardized and the height of the circuit breaker 5 and the main bus 6 is determined by appropriately combining the bus connection units 9 according to the cable size and the pull-in direction of the external cable 7 Good.
In addition, since the size and number of the pleat portions for securing the creepage length vary depending on the voltage of the applied system, an optimal value may be selected for each.

Next, another embodiment of the busbar connection unit 9 will be described. FIGS. 5A and 5B are diagrams showing a second embodiment of the busbar connection unit 9. FIG. 5A is a front view, FIG. 5B is a side view, and FIG. Parts equivalent to those in FIG. 4 are denoted by the same reference numerals. In each of the following embodiments, the method of illustration is the same as the method of illustration.
5 differs from FIG. 4 in the shape of the folds between the phases. The pleat portion 13c is bent as shown in the figure and connected to and integrated with the interphase pleat portion 13b. As a result, pleated portions are continuously formed from the phase on one end side in the length direction of each stepped connection bus 12a to 12c to the phase on the other end side. Thereby, for example, the creepage distance between the left end side of the stepped connection bus 12a and the exposed conductor portion on the right end side of the stepped connection bus 12b is also increased at the bent portion of the fold 13c. The creepage length is ensured and the busbar connection unit 9 is reduced in size. Reduction of each busbar connection unit 9 can also contribute to reduction in the width direction of the switchgear.

Next, a third embodiment of the busbar connection unit 9 will be described with reference to FIG. FIG. 6 is a modification of FIG. The creeping insulation distance between the ground is the same as in the case of FIGS. 4 and 5, with the pleats 13 a in the vicinity of both ends in the longitudinal direction of the main body of the insulating member 13. 13d is provided. The pleat portion 13d is provided with a step in the same direction according to the step of the stepped connection buses 12a to 12c, and continuously from the phase at one end side to the phase at the other end side of the stepped connection buses 12a to 12c. It is provided and integrally formed around the main body of the insulating member 13. The number of the pleat portions 13d between the phases is two in the figure, but may be increased or decreased as appropriate.
By configuring in this way, the creepage length between phases can be ensured by the pleat portions 13d, so that the same effect as in FIG. 5 can be obtained.

Next, FIG. 7 is a diagram showing a fourth embodiment of the busbar connection unit 9. The bus bar connecting unit 9 includes a pleat portion 13e perpendicular to the protruding direction so as to surround the vicinity of the connecting portion of each phase protruding outward from the main body of the insulating member 13 in each stepped connecting bus 12a to 12c. Is formed integrally with the main body by molding. What is necessary is just to increase / decrease the number of the pleat part 13e suitably.
With such a configuration, it is possible to increase both the creepage lengths between the phases and the ground at the pleats 13e.

Further, FIG. 8 is a diagram showing a fifth embodiment of the busbar connection unit 9, which is a modification of FIG. The portion where the pleat portion is provided is similar to the case of FIG. 7, but the pleat portion 13 f of the bus bar connection unit 9 is provided in each phase of the stepped connection bus bars 12 a to 12 c protruding outward from the main body portion of the insulating member 13. Is formed in a cylindrical shape that is parallel to the protruding direction and is integrally formed with the main body.
Even in such a configuration, the same effect as in FIG. 7 can be obtained by the pleat portion 13f.

  As described above, according to the switchgear of the first embodiment, a plurality of panels in which a three-phase main bus arranged horizontally, a circuit breaker, and an external cable connected to the circuit breaker are accommodated. Switch gears that are arranged in a row and connected to the main buses of adjacent boards, and the main buses in places where boards with different main bus arrangement heights are adjacent Since the three-phase stepped connection buses bent at the same step are connected by a busbar connection unit that is integrally molded by molding with an insulating member leaving the connection portion, an external cable for switchgear configured as a panel When the pull-in direction of the cable and cable size are different and the height of the main bus bar from the floor is different between adjacent panels, it is possible to easily cope without enlarging the chassis of the panel and to reduce the switch gear Can do.

  In addition, on the surface of the insulating member of the busbar connection unit, a pleat portion for securing a creeping insulation distance is integrated with the insulating member in a portion between the phase of the three-phase stepped connection busbar and between the stepped connection busbar and the ground. Therefore, the bus bar connecting unit can be reduced, and the switch gear can be reduced in the width direction.

  In addition, the pleats formed between the phases of the three-phase stepped connection buses are provided continuously from the phase on one end side to the phase on the other end side in the length direction of the stepped connection buses, so that the bus connection The unit can be further reduced, and the switch gear can be reduced in the width direction.

  Moreover, the pleats are provided so as to surround the vicinity of the connection parts at both ends of the three-phase stepped connection bus. Therefore, the switch gear can be reduced in the width direction.

  In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

1, 1a Leading board 2-4, 2a-4a Feeder board 5 Breaker 6, 6a-6c Main bus 7 External cable 8a-8c Inter-board connection bus 9 Bus connection unit 10a, 10b Main circuit connection 11 Connection conductor 12a 12c Stepped connection bus 13 Insulating member 13a-13f A pleat part.

Claims (4)

A plurality of panels in which three-phase main buses arranged in the horizontal direction, a circuit breaker, and an external cable connected to the circuit breaker are accommodated are arranged in a row, and the main buses of the adjacent panels are arranged. A switch gear configured to be connected,
The main buses at the locations where the boards having different arrangement heights of the main buses are adjacent to each other, the stepped connection buses of the three phases bent at the same step as the difference in the arrangement height are left in the stepped portion . switchgear characterized in that the bent portion of the connection busbars by busbar connection unit formed on one body by an insulating member, is connected. The switchgear according to claim 1, wherein
On the surface of the insulation member of the bus bar connection unit, there are pleats for securing a creeping insulation distance between the phases of the stepped connection buses of three phases and between the stepped connection buses and the ground. A switchgear formed integrally with a member. The switchgear according to claim 2,
The pleat portion formed between the phases of the three-phase stepped connection buses is provided continuously from the phase on one end side to the phase on the other end side in the length direction of the stepped connection bus. Switch gear to play. The switchgear according to claim 2,
The switch gear is characterized in that the pleat portion is provided so as to surround the vicinity of the connection portion at both ends of the stepped connection bus of three phases.

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