JP2017212779A - Closed type switch gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a closed type switch gear which prevents a depth dimension from being enlarged even in the case where thin film switch gears are constituted back to back, although there is the problem that a switch gear contour is enlarged in a depth direction since the thin film switch gear crosses a main bus in a longitudinal direction when pulling out an outside cable upwards.SOLUTION: Multiple breakers 2 are arranged side by side in a longitudinal direction, two sets of the breakers are disposed and within one cabinet CA, the two sets of breakers 2 are arranged back to back. A main bus 1 is disposed in a center and an upper part of the cabinet CA in a longitudinal direction. 1-7 branch conductors 4 connected to the main bus 1 are disposed so as to be juxtaposed in a width direction of the cabinet CA while being erected in the center of the cabinet CA in the longitudinal direction, such that the cabinet and the main bus 1 are shared.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a closed switchgear, and more particularly to a structure of a metal closed switchgear in which a switching device such as a circuit breaker is housed in a metal casing.

As shown in Fig. 7, the closed-type switchgear is assumed to have two switchgears, each containing a plurality of circuit breakers, placed back to back, with the front side being the door 11 and the back side being removed locally. There is a thin type that is configured by a cover 12 that is not provided and is assumed to perform maintenance / operation from the front (see Patent Document 1). 7A shows a front view with the door removed, and FIG. 7B shows a side view with the side plate omitted.
In this type of switchgear, a main bus 1 for forming an electric circuit with an adjacent panel is usually arranged at the top. The circuit breaker 2 is arranged in two stages, or three or more stages, vertically arranged close to the right side of the front (an example of three stages is shown in FIG. 7).
The circuit breaker 2 is a movable type with wheels, and can be moved to the connection position and disconnection position by operating from the front of the switchgear, and can be pulled out of the panel by using a dedicated lifter. It is. The main bus 1 and the upper terminal of each circuit breaker 2 are connected by a branch conductor 4, and the lower terminal of the circuit breaker 2 and the external cable connection terminal 8a arranged on the left side of the circuit breaker 2 are current measuring current transformers 10. It is connected by conductors, such as an electric wire, via.

When the external cable 8 is pulled upward, it passes through the front side of the main bus 1 and is pulled out so as not to interfere with the main bus 1. When the circuit breakers 2 are stacked in three stages, the main bus 1 and the upper terminal of the circuit breaker 2 arranged at the uppermost stage are connected by the upper branch conductor 4a. The upper terminals of the uppermost circuit breaker 2a and the middle circuit breaker 2b are connected by a middle branch conductor 4b. Further, the upper terminal of the middle circuit breaker 2b and the upper terminal of the lowermost circuit breaker 2c are connected by a lower branch conductor 4c.
The middle branch conductor 4 b and the lower branch conductor 4 c pass between the circuit breaker 2 and the back cover 12. This type of switchgear is often planned for back-to-back installation due to installation space constraints, and is fixed to the foundation at the foundation fastening part provided on the floor. Usually, the foundation installation is in front of and behind the switchgear. Adjacent switch gears are arranged by fastening the front and rear columns with bolts.

JP-A-7-39027 (FIGS. 42 and 43)

  Since the thin switchgear described in Patent Document 1 intersects with the main bus in the front-rear direction when the external cable is drawn upward, the outer shape of the switchgear increases in the depth direction. In addition, the foundation installation part has fastening sites on the front and rear sides of the floor surface, but when equipment and conductors are placed at the bottom of the panel, it is difficult to access the foundation fastening part on the rear side and workability is poor. . Furthermore, when the rear column of the adjacent board is fastened with bolts to line up with the adjacent board, especially when the device is arranged in front of the fastening portion, access is difficult and workability is poor. .

  Further, when the above-mentioned thin switchgear is configured to be back-to-back, it is necessary to connect the main busbars with a conductor at an arbitrary part of the arrangement, resulting in wasted space and conductor material costs. Further, since it is necessary to secure an insulation distance between the middle branch conductor, the lower branch conductor, and the back cover, there is a problem that the switchgear main body becomes large in the depth direction.

  The closed-type switchgear of the present invention includes two sets of circuit breakers arranged vertically, and the two sets of circuit breakers are arranged back-to-back in a single casing, and the main busbars are arranged at the front and rear of the casing. A plurality of branch conductors arranged at the center and in the upper part of the direction and respectively connected to the circuit breaker from the main bus line stand upright at the center in the front-rear direction of the casing and are juxtaposed in the width direction of the casing The branch conductors are each constituted by a plate-like member, and extend parallel to the back surface of the circuit breaker.

  According to the present invention, it is easy to ensure insulation of the branch conductor, and the depth dimension of the switch gear can be reduced. In addition, by reducing the depth dimension and consolidating the busbars into one, an external line space can be secured, so the workability of external line construction work is improved.

It is the front view and side view which show the structure of the closed type switchgear in Embodiment 1 which concerns on this invention. It is a top view which shows the structure of the closed type switchgear in Embodiment 1 which concerns on this invention. It is sectional drawing in the III-III line described in FIG. It is sectional drawing in the IV-IV line described in FIG. It is a side view which shows the structure of the closed type switchgear in Embodiment 2 which concerns on this invention. It is sectional drawing in the VI-VI line described in FIG. It is the front view and side view which show the example which has arrange | positioned the thin switchgear on back.

Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIGS. 1A and 1B are diagrams showing a closed type switchgear according to Embodiment 1, in which FIG. 1A is a front view with a front door omitted, and FIG. 1B is a side view with a side plate omitted. . FIG. 2 is a top view. 3 shows a cross-sectional view taken along line III-III shown in FIG. 1, and FIG. 4 shows a cross-sectional view taken along line IV-IV shown in FIG.
A plurality of circuit breakers 2 are arranged inside a casing CA constituting the outer periphery of the panel in the closed switchgear, and the circuit breakers 2 are connected to the main bus 1 by branch conductors 4 respectively. The main bus 1 constitutes a common electric circuit with the adjacent board formed by the casing CX. The casing CA is coupled to the foundation structure by the foundation fastening portion BC. The casing CA and the adjacent casings CX are connected by a row board fastening portion NC.
The main bus 1 is arranged in the upper part of the board formed by the casing CA, and is arranged in order of the R-phase bus 1R, the S-phase bus 1S, and the T-phase bus 1T from the front. At this time, the position of the S phase is arranged at the center position in the longitudinal direction of the switchgear.

Two sets of the circuit breakers 2 arranged in a vertical direction are arranged at the positions shown in FIG. Each circuit breaker 2 can be disconnected by operating in the direction of the arrow shown in FIG. 2, and can be pulled out of the panel by using a dedicated lifter for maintenance. The main bus 1 and the upper terminal 3 of the lowermost circuit breaker 2 are directly engaged with and fitted into the branch conductor 4. This branching conductor 4 is arranged at the center in the front-rear direction of the switchgear, and is composed of one piece up to the lowermost circuit breaker upper terminal 3.
Note that the upper terminal 5 of the circuit breaker other than the lowest stage is directly connected to the branch conductor 4.

Next, the structure of the conductive part on the secondary side of the circuit breaker will be described. The circuit breaker 2 is arranged close to one side of the switchgear as shown in FIG. 2, but the conductor 7 connected to the lower terminal 6 of the circuit breaker 2 extends downward once, and the circuit breaker is It is configured to extend in the opposite direction to the direction approaching one side of the switchgear, and is connected to the external cable 8 that enters from the outside of the panel.
The external cable 8 is carried in from an external line space 9 provided on the front surface or the rear surface of the main bus 1. Further, a current transformer 10 for measurement may be provided between the external cable 8 and the circuit breaker 2. A row board fastening portion NC for lining up with an adjacent board is provided on a pillar near the door 11. Also. The foundation fastening part BC is provided on the floor near the door 11.

  By having the above structure, it is not necessary to consider the insulation distance between the branch conductor 4 and the back cover 12 (see FIG. 7), so that it is easy to ensure insulation of the branch conductor 4, and the depth dimension of the switch gear is reduced. Can do. Further, by reducing the depth dimension and consolidating the main bus bars 1 into one, the outer line space 9 can be secured, so the workability of the outer line construction work is improved. Furthermore, the conductor 13 that connects the main buses 1 connected at the site, which was necessary in the example of FIG. 7, is eliminated, and the work at the site is reduced. Further, the base fastening portion BC and the row board fastening portion NC between the adjacent boards are located near the door 11 and workability at the time of fastening is improved.

The metal closed switchgear according to the first embodiment of the present invention includes two sets of circuit breakers 2 arranged vertically, and the two sets of circuit breakers 2 are arranged back to back in a single casing CA. In addition, the main bus 1 is disposed at the center and upper part in the front-rear direction of the casing CA, and a plurality of branch conductors 4 respectively connected from the main bus 1 to the circuit breaker are provided in the front-rear direction of the casing CA. The branch conductors 4 are each constituted by a plate-like member, and are arranged so as to stand upright at the center of the casing CA in the width direction of the casing CA. It is characterized by being arranged in a line extending in parallel lines.
With this configuration, since it is not necessary to consider the insulation distance between the branch conductor and the back cover, it is easy to ensure insulation of the branch conductor, and the depth of the switch gear can be reduced. In addition, by reducing the depth dimension and consolidating the busbars into one, an external line space can be secured, so the workability of external line construction work is improved.

Moreover, in the metal closed type switchgear in Embodiment 1 which concerns on this invention, while providing the door 11 in the said housing | casing facing the front surface FS of the said circuit breaker 2 in the structure of the preceding clause, it is fastening for row boards. The part NC and the base fastening part BC are concentrated on the front surface FS side of the circuit breaker 2.
With this configuration, the row board fastening portion NC and the foundation fastening portion BC are in the vicinity of the door 11 and workability at the time of fastening is improved.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIGS. A side view of the second embodiment is shown in FIG. FIG. 6 shows a cross-sectional view taken along line VI-VI shown in FIG. Similar to the first embodiment, six branch conductors 4 are arranged in a line in the board width direction. Further, these six conductors 4 are fixed by an integral insulator 14. The insulator passes through in the width direction, and fixing is performed by directly fixing the side surface of the insulator 14 and the column of the housing with bolts.

  By having such a structure, the six branch conductors can be fixed efficiently, and the cost can be reduced by reducing the number of parts.

  As described above, the closed type switchgear of the present invention consolidates the two back-to-back thin boards on one surface, and therefore the main bus bar is disposed at the center and the upper part in the front-rear direction of the switchgear. In addition, two sets of the circuit breakers arranged vertically are arranged. For example, when only three circuit breakers are arranged vertically, six circuit breakers are accommodated per switch gear surface. The front and rear surfaces of the switch gear are both door structures, and one set of circuit breakers arranged vertically can be pulled out from the front surface, and another set of circuit breakers can be pulled out from the rear surface. The branch conductor connected to the main bus bar is arranged upright at the center in the front-rear direction. One set of the branch conductors is prepared for a set of a plurality of circuit breakers arranged vertically. That is, two sets of branch conductors are arranged on one surface of the switch gear. Note that one set of branch conductors described here indicates conductors for three phases. The two sets of branched conductors, that is, six conductors are arranged in parallel in the width direction. Further, the basic fastening portion of the switch gear is disposed on the front and rear portions of the switch gear, that is, on the floor surface near the front and rear doors. The fastening part for the row board with the adjacent board is also arranged on the pillar part near the doors of the front and rear parts.

  It should be noted that within the scope of the present invention, a part or all of each embodiment can be freely combined, or each embodiment can be appropriately modified or omitted.

1: main bus bar, 2: circuit breaker, 2a: upper stage circuit breaker, 2b: middle stage circuit breaker, 2c: lower stage circuit breaker, 3: upper terminal of the lowest stage circuit breaker, 4: branch conductor, 4a: branch conductor for upper stage, 4b: Branch conductor for middle stage, 4c: Branch conductor for lower stage, 5: Upper terminal of upper and middle circuit breakers, 6: Lower terminal of circuit breaker, 7: Conductor, 8: External cable, 8a: External cable connection terminal 9: Outside line space, 10: Current transformer for instrument, 11 door, 12: Back cover, 13: Conductor, 14: Insulator.

Claims (8)

  Two sets of circuit breakers arranged vertically are arranged, and the two sets of circuit breakers are arranged back-to-back in one casing, and the main busbar is arranged at the center and upper part in the front-rear direction of the casing A plurality of branch conductors respectively connected from the main bus to the circuit breaker are arranged so as to stand upright in the center in the front-rear direction of the casing and juxtaposed in the width direction of the casing; Each of the branch conductors is composed of a plate-like member, and is arranged to extend in parallel with the back surface of the circuit breaker.   2. The closed switch according to claim 1, wherein a door is provided in the housing so as to face the front surface of the circuit breaker, and a row board fastening portion and a foundation fastening portion are integrated on the front side of the circuit breaker. gear.   3. The closed switchgear according to claim 2, wherein the two sets of circuit breakers are arranged so as to be shifted to the left and right sides in the width direction of the casing.   4. The closed switchgear according to claim 2, wherein the branching conductor is constituted by a single conductor from the main bus bar to a lowermost circuit breaker. 5.   5. The closed switchgear according to claim 4, wherein an upper terminal of the lowermost circuit breaker is directly engaged and fitted into a branch conductor branched from the main bus.   The closed-type switchgear according to claim 3, wherein the branching conductors are arranged such that two sets of six conductors of three phases are arranged in a line in the width direction of the casing.   The main bus bar is arranged on the top of the board in the order of R phase, S phase, T phase from the front, and the position of the S phase is located in the center in the front-rear direction. Item 3. A closed switchgear according to item 2.   3. The closed switchgear according to claim 1, wherein the six branch conductors are integrally fixed with an insulator that spans between columns on both side surfaces of the casing. 4.

Images