JP5618652B2 - Metal closed switchgear - Google Patents

Description

  The present invention relates to a metal closed switchgear, and more particularly to a metal closed switchgear that can be flexibly adapted to installation space and required specifications.

  The metal closed switchgear contains electrical equipment such as circuit breakers, busbars, instrument current transformers, and external cables inside the housing, and power is supplied from the busbars to the load via the circuit breakers, instrumental current transformers, and external cables. Supply. As a conventional technology of such a metal closed switchgear, electrical devices such as circuit breakers and current transformers are housed in individual compartments, and busbars are provided in a common unit. There is one in which a common unit is attached so as to be able to come into contact with and separated from each other, thereby providing a degree of freedom for changing individual devices (for example, see Patent Document 1).

JP-A-5-227615 (first page, FIG. 1)

  In the conventional technology as described above, each device is housed in a separate compartment, and the bus bar is provided in the common unit. Two circuit breakers are connected to this bus, but this structure requires two buses. The external cable connected to the circuit breaker on the lower side is drawn from the floor of the switchboard (lower drawer), and the external cable connected to the circuit breaker on the upper stage is drawn from the ceiling of the switchboard (upper) drawer). If it can only be pulled out from the ceiling, it is very difficult to connect to the lower circuit breaker. In addition, when it can only be pulled out from the floor surface, it is necessary to largely route the external cable from the rear surface side of the switchboard to connect to the upper circuit breaker, and a space other than the installation area is required. Furthermore, since the bus bar is arranged on the rear side of the circuit breaker, it is necessary to connect the bus bar by drawing out the circuit breaker when connecting the bus bars of the adjacent switchboards. In addition, depending on the electrical room, it may be required to reduce the depth dimension, and in the structure in which the bus bar is arranged on the rear side of the circuit breaker, it is difficult to reduce the depth dimension of the switchboard. there were.

  The present invention has been made in order to solve the above-described problems of the prior art. When the position of drawing (drawing) the external cable is changed between the upper and lower sides, and the busbar when the circuit breaker has a two-stage product The purpose is to obtain a metal-closed switchgear that can be flexibly adapted to the contact with the front and that can easily handle front operation / front maintenance, front operation / rear maintenance.

The metal closed type switchgear according to the present invention is formed so as to hold the circuit breaker, and is connected to one terminal of the held circuit breaker and the second terminal connected to the other terminal. A support member having a terminal portion, a bus connected to one of the first and second terminal portions via a branch conductor, and one end connected to the other of the first and second terminal portions. An external cable connection terminal connected to the other end of the conductor extending through the current transformer is provided inside the housing, and when the basic unit pulls out the external cable from the lower part of the housing, the inside of the housing in order from the top, The bus line, the support member, the current transformer for the instrument, and the external cable connection terminal are arranged in this order, and when the external cable is pulled out from the ceiling portion of the enclosure, the external cable connection terminal in order from the top of the enclosure. The current transformer for the instrument The support member, in which are arranged in this order of the bus.

In this invention, when the basic unit pulls out the external cable from the lower part of the housing, the bus, the support member, the current transformer for the instrument, and the external cable connection terminal are arranged in this order from the top to the inside of the housing. When the external cable is pulled out from the ceiling of the housing, the external cable connection terminal, the current transformer for the instrument, the support member, and the bus are arranged in this order from the top of the housing. Therefore, the basic unit has a basic function as a switchgear, and can easily cope with the case where the outside cable is pulled out either up or down, and it is also configured for front operation / front maintenance type, front operation / rear maintenance type. It is possible to share parts.

It is a figure which shows schematically the basic unit of the metal closure type switchgear concerning Embodiment 1 of this invention, (a) is a front view, (b) is a side view. It is a figure which shows roughly the case where the arrangement | positioning of the basic unit of FIG. 1 is changed to the up-down direction, and the outside line cable is made into the upper drawer, (a) is a front view, (b) is a side view. It is a figure which shows roughly the case where it is set as the front operation / rear maintenance type with a two-circuit structure using the basic unit of FIG. 1, (a) is a front view, (b) is a side view. It is a figure which shows the partition position at the time of providing a partition in the metal closed type switchgear shown in FIG. 3, (a) is a front view, (b) is a side view. It is a figure which shows roughly the case where it is set as the front operation / rear maintenance type with a two-circuit structure using the basic unit of FIG. 2, (a) is a front view, (b) is a side view. It is a figure which shows schematically the metal closed type switchgear which concerns on Embodiment 2 of this invention, (a) is a front view, (b) is a side view. This is a case where the basic function unit of FIG. It is a figure which shows the partition position at the time of providing a partition in the metal closed type switchgear shown in FIG. 6, (a) is a front view, (b) is a side view. It is a figure which shows schematically the case where the arrangement | positioning of the metal closed type switchgear shown in FIG. 6 is changed to an up-down direction, and an outside line cable is made into an upper drawer, (a) is a front view, (b) is a side view. It is a figure which shows schematically the metal closed type switchgear which concerns on Embodiment 3 of this invention, (a) is a front view, (b) is a side view. This is a case where the basic unit of FIG. 1 is a front operation / maintenance type with a two-circuit configuration arranged side by side. It is a figure which shows roughly the case where the arrangement | positioning of the metal closed type switchgear shown in FIG. 9 is changed to an up-down direction, and the outside line cable is made into the upper drawer, (a) is a front view, (b) is a side view. It is a figure which shows roughly the metal closed type switchgear which concerns on Embodiment 4 of this invention, (a) is a front view, (b) is a side view. The buses of the basic unit shown in FIG. 1 are used in common, and the buses are stacked vertically symmetrically in the center. The front view which shows roughly the metal closed type switchgear which concerns on Embodiment 5 of this invention.

Embodiment 1 FIG.
1 to 5 are diagrams schematically illustrating main portions of a metal closed switchgear according to Embodiment 1 of the present invention. FIG. 1 shows a basic unit of a metal closed type switchgear when an external cable is pulled out from the lower side of the housing. In FIG. 1, a basic unit 100 of a metal closed switchgear accommodates a housing 1 having a front door 1a and a three-phase circuit breaker (not shown), and one terminal (junction) of the circuit breaker. A support member 2 having a first terminal portion 2a to be connected, a second terminal portion 2b to be connected to the other terminal, a bus 3 disposed in the width direction above the support member 2, and a bus 3 The branch conductor 4 connecting the first terminal portion 2a, the instrument current transformer 5 installed on the lower side of the support member 2, and one end connected to the second terminal section 2b, the instrument current transformer 5 An external line cable connection terminal 7 connected to the other end of the conductor 6 extending therethrough and a zero-phase current transformer 9 provided so as to pass through the external line cable 8 connected to the external line cable connection terminal 7 are provided. .

  In addition, the same code | symbol is attached | subjected about the same or equivalent part and member throughout each figure. Moreover, each front view (a) shows only the principal part structure except the front door 1a and the partition wall, and illustration of the current transformer 5 and zero phase current transformer 9 is abbreviate | omitted in the side view (b). May have. The first terminal portion 2a is provided on the upper stage side of the support member 2 for three phases at predetermined intervals in the horizontal direction, and the second terminal portion 2b is also predetermined in the horizontal direction below the first terminal portion 2a. Three phases are provided at intervals. As the circuit breaker not shown, for example, a drawer type vacuum circuit breaker is preferably used, but a circuit breaker based on another operating principle may be used. FIG. 1 shows an example in which the instrument current transformer 5 is arranged in the R and T phases. The external cable 8 is installed so as to pass through the zero-phase current transformer 9 when the three RST phases are bundled and to be drawn out (drawn) from the lower part of the housing 1. The external cable 8 is arranged so that it can be connected from the front side. The installation position of the zero-phase current transformer 9 is not limited to the illustrated one, and can be installed at any position as long as the combined current of the RST phase can be measured.

  Further, as shown in FIG. 2 described later, when the bus bar 3 is disposed below the support member 2, the second terminal portion 2 b is connected to the bus bar 3. In addition to the above, a control device or the like is installed in the housing 1 as in the conventional case, and electronic relays and the like are mounted on the front door 1a (both not shown) to open and close the circuit breaker. it can. The basic unit 100 has a basic function as a switch gear in which an energization circuit connected from the bus 3 to the external cable 8 through the circuit breaker and the current transformer 5 is configured as described above. A metal closed type switchgear can be constituted alone. And operation to a circuit breaker, connection work, maintenance work, etc. of bus 3 or external line cable 8 can also be carried out from the front side of case 1.

  A basic unit 100 including a bus 3, a support member 2, an instrument current transformer 5, an external cable connection terminal 7, and a zero-phase current transformer 9 in order from the top disposed in the housing 1 includes: The position of each of these constituent members inside 1 is fixed so that it can be changed up and down. FIG. 2 shows an example in which the external cable 8 is configured so as to be adapted to the case where it is pulled out from the ceiling portion of the housing 1. In this case, the zero-phase current transformer 9, the external cable connection terminal 7, the instrument current transformer 5, the support member 2, and the bus 3 are arranged in this order from the top of the housing 1. As described above, the basic unit 100 having a function as a single metal closed type switchgear is configured so that the drawing position of the external cable 8 can easily cope with the upper and lower cases.

  FIG. 3 shows a case where the basic unit 100 of FIG. In FIG. 3, the metal closed switchgear 200 is connected to the basic unit 100 used in the first circuit arranged in the same manner as shown in FIG. A cable box having a height equivalent to the total height of the box 1 and the box 10 of the basic unit 100, which are fixed to the rear surface side of the box 10 containing the two supporting members 2A. 11, the second circuit-side instrument current transformer 5A provided at the upper part of the cable box 11, the external cable connection terminal 7A, the zero-phase current transformer 9A, and the upper side of the support member 2A. The conductor 6A connected to the external cable connection terminal 7A from the third terminal portion 2Aa through the current transformer 5A and the fourth terminal portion 2Ab on the lower stage side of the second support member 2A are incorporated in the basic unit 100. With the common bus 3 provided It is constructed by adding a connection branch conductor 4A.

  The external circuit cable 8A of the second circuit connected to the external cable connection terminal 7A passes through the zero-phase current transformer 9A when three RST phases are bundled, similarly to the first circuit. The second support member 2 </ b> A accommodates a circuit breaker (not shown) similar to that used for the basic unit 100. Further, as shown by a thick line in FIG. 4, a metal closure type switchgear 200 configured as shown in FIG. 3 is provided with a partition 12 between three compartments, for example, a bus room A, a circuit breaker room B, and a cable room C. It is also possible. Further, as shown in FIG. 5, by disposing the constituent members of FIG. 3 upside down, the external cable 8 of one circuit is routed from the ceiling of the housing 1 and the external cable 8A of the other circuit is cabled 11 It can also be configured to be pulled out from the ceiling part.

  As described above, according to the first embodiment, the basic unit 100 constituting the switch gear for one circuit shown in FIG. 1 is arranged in order from the top installed in the housing 1, the bus bar 3, the support member 2, The installation position of the instrument current transformer 5, the external cable connection terminal 7, and the zero-phase current transformer 9 is fixed so that it can be changed up and down. Can be easily accommodated. In addition, since front operation and maintenance can be maintained, it is possible to cope with a small space in the depth direction.

  Further, without changing the functional components, that is, the components for one circuit connecting the bus 3, the circuit breaker, the current transformer 6 and the zero-phase current transformer 9, the second stage is placed in the upper stage as shown in FIG. A box 10 containing a second support member 2A for mounting a circuit-side circuit breaker is installed, and a second circuit-side cable box 11 is fixed to the rear surface side. By extending the conductor 6A horizontally from the terminal 2Aa on one side toward the cable box 11 and connecting it to the external cable connection portion 7A via the current transformer 5A, the circuit breaker 2 for front operation and front and rear surface maintenance is provided. A stacked configuration can be realized. As a result, the external cable 8A connected to the rear side is only one of the two circuits, so that the depth dimension of the cable box 11 can be reduced, and the depth dimension of the entire switch gear can be reduced. Can do. Furthermore, as shown in FIG. 5, it is easy to change both the external cables 8 and 8A of the two circuits to be drawn out from above.

  Further, since the partitions 12 (FIG. 4) are provided between the compartments, the external cables 8 and 8A are also partitioned from each other, so that, for example, the replacement of the external cable on the other side and maintenance work can be performed without power failure on one circuit. Can be implemented. Further, in the basic unit 100, positions that are always adjacent to the upper and lower sides of the support members 2 and 2A each having the first and second terminal portions 2a (2Aa) and 2b (2Bb) regardless of the upper and lower drawing positions of the external cable 8. Since the bus bar 3 is disposed at the center, the length of the branch conductor 4 can be shortened. Similarly, the instrumental current transformer 5 is always positioned in the vicinity of the supporting members 2 and 2A having the first and second terminal portions 2a (2Aa) and 2b (2Bb) or adjacent to the upper and lower sides. Therefore, the length of the conductor 6 (6A) connected to the external cable connection terminal 7 (7A) can be minimized. In addition, waste and resource reduction can be expected, leading to a reduction in environmental load.

Embodiment 2. FIG.
6A and 6B are diagrams schematically showing a metal closed switchgear according to Embodiment 2 of the present invention, where FIG. 6A is a front view and FIG. 6B is a side view. The second embodiment is an example in which the basic unit 100 of FIG. 1 is used and the front operation / front maintenance type is adopted with a two-circuit configuration. In the figure, the metal closed type switchgear 201 fixes the box 13 containing the second support member 2A on the second circuit side to the upper part of the basic unit 100 shown in FIG. The fourth terminal portion 2Ab on the lower side of the second support member 2A is connected to the common bus 3 disposed in the basic unit 100 by the branch conductor 4A. Further, a cable box 14 having a height equivalent to the total height of the housing 1 and the box 13 of the basic unit 100 added together is fixed to the side surface side (left side as viewed from the front in FIG. 6A).

  The conductor 6A passes through the upper portion of the support member 2A from the upper terminal portion 2Aa of the support member 2A toward the inside of the cable box 14, and is fixed to the cable box 14 near the substantially side surface of the support member 2A. The external cable connection terminal 7A is connected via the flow device 5A. The bus bar 3 is installed extending in the left-right direction up to the back side of the cable box 14 so that the closed metal switch gear 201 is arranged in the left-right direction. The external cable 8A connected to the external cable connection terminal 7A passes through the front side of the bus 3 when the three cables are bundled, passes through the zero-phase current transformer 9A, and is then drawn out below the cable box 14. It is.

  In the metal closed type switchgear 201 configured as shown in FIG. 6, for example, as shown in FIG. 7, a partition 12 may be provided between the three compartments of the bus bar room A, the circuit breaker room B, and the cable room C. Is possible. Further, FIG. 6 shows the case where the drawing direction of the external cables 8 and 8A is the downward direction in the figure, but conversely the case where the external cables 8 and 8A are configured to be drawn upward in the figure. It is shown in FIG.

  In the second embodiment configured as described above, the breaker 2 is fixed by fixing the box 13 disposed on the upper stage and the cable box 14 disposed on the side surface without changing the basic structure shown in FIG. A stacked configuration can be realized. Accordingly, since the external cables 8 and 8A for two circuits can be accessed from the front side of the metal closed type switchgear 201, the entire depth of the switchgear can be reduced, and the rear side maintenance space can be reduced. The installation / maintenance space required for the electrical room can be reduced.

  Further, as shown in FIG. 7, by providing a partition 12 between the compartments, the cable chamber C portion is also partitioned, so that it is a front operation, front maintenance type metal closed type switchgear. Without powering off one of the circuits, the other external cable can be replaced and maintenance work can be performed. Further, by changing the arrangement of the constituent members in the vertical direction, the external cables 8, 8A can be configured to be drawn out from either the top or the bottom as necessary.

Embodiment 3 FIG.
9 and 10 are diagrams schematically showing a metal closed switchgear according to Embodiment 3 of the present invention, in which (a) is a front view and (b) is a side view. The metal closed type switchgear 202 according to the third embodiment accommodates the circuit components of the basic unit 100 shown in FIG. 1 in a single large housing 15 in a two-circuit configuration arranged side by side. This is the case of the maintenance type. In FIG. 9, a common bus 3 for three phases extends in the left-right direction at the upper part of the housing 15 whose width is slightly less than twice that of the housing 1 in FIG. 1. Support members 2, 2 A, current transformers 5, 5 A, external cable connection terminals 7, 7 A, and zero-phase current transformers 9, 9 A are arranged in parallel below the bus 3.

  Although FIG. 9 shows the case where the drawing direction of the external cable is at the lower part of the housing 15, the fixing of each member to the housing 15 can be changed in the vertical direction in advance, as shown in FIG. 10. It is also easy to configure the external cables 8, 8A to be drawn from the upper part of the housing 15. The other configurations such as the connection between the bus 3 and the first terminal portions 2a and 2Aa and the connection between the second terminal portions 2b and 2Ab and the external cable connection terminals 7 and 7A are the same as those in the first embodiment. Therefore, explanation is omitted.

  In the third embodiment configured as described above, the circuit breaker two-circuit configuration is realized by the front operation / front maintenance method by arranging the right and left sides side by side without changing the basic structure shown in FIG. Can do. As a result, the overall depth of the switchgear can be reduced, the installation / maintenance space required for the electrical room can be reduced, and the height can also be reduced. Moreover, as illustrated in the first and second embodiments, it is easy to provide a partition 12 (FIGS. 4 and 7) between the respective compartments, and by providing the partition 12, a power failure occurs in one circuit. In addition, the replacement of the other external cable and maintenance work can be performed.

Embodiment 4 FIG.
FIG. 11 is a diagram schematically showing a metal closed switchgear according to Embodiment 4 of the present invention, in which (a) is a front view and (b) is a side view. In the fourth embodiment, the buses of the basic unit shown in FIG. 1 are used in common, and the buses are vertically symmetrically stacked in the center to accommodate two circuits. In the figure, a metal closing type switchgear 203 is fixed to the upper part of the basic unit 100 shown in FIG. 1 by a unit corresponding to the unit shown in FIG. Note that the second circuit expansion chassis 16 installed on the upper part of the basic unit 100 may have the same size as the chassis 1 or may be prepared separately, or the size of the chassis 1 may be easily shortened in advance. You may comprise so that it can. Further, the terminal portion 2Ab of the upper support member 2A and the bus 3 are connected by a branch conductor 4A.

  In the fourth embodiment configured as described above, the drawing directions of the two-line external cables 8 and 8A can be separated into upper and lower sides by stacking them vertically without changing the basic structure shown in FIG. In this case, the width and depth direction of the metal closed switch gear 203 can be reduced. In addition, by providing a partition between the compartments as in the first and second embodiments, it is possible to perform replacement work and maintenance work of the external cable on the other side without power failure of the circuit on the other side.

Embodiment 5. FIG.
FIG. 12 is a front view schematically showing a metal closed switchgear according to Embodiment 5 of the present invention. In addition, this Embodiment 5 has shown the metal closed type switchgear 204 of the multicircuit (9 circuits) structure comprised by combining the switchgear shown in the said Embodiment 1-4. In the figure, O is the basic unit 100 shown in FIG. 1 of the first embodiment, I is the switch gear shown in FIG. 3 of the first embodiment, and II is the switch gear shown in FIG. 6 of the second embodiment. III represents the switchgear shown in FIG. 9 of the third embodiment, and IV represents the switchgear shown in FIG. 11 of the fourth embodiment.

  In the fifth embodiment configured as described above, since the basic unit 100 has a basic functional structure, all the vertical positions of the bus bars 3 can be unified at the same position as shown in the figure. Therefore, it is possible to arrange the lined bus bars 3 so as to be linearly connected in the horizontal direction. Depending on the building where the switchgear is installed, the electric room has an L-shape, for example, a pillar comes out of the wall, or there are ceiling beams, ducts, etc., so there is a space for installing electrical equipment. Limited. Even in such a case, as in the fifth embodiment, by changing the basic structure, various measures can be taken, and a metal closed switchgear that is an optimal power distribution facility for the electrical room can be manufactured. In the case of a multi-circuit configuration, it goes without saying that various combinations can be made, such as arranging a plurality of the basic units 100 exemplified above or the metal closed type switchgears 200, 201, 202, 203 side by side. Yes.

  DESCRIPTION OF SYMBOLS 1 Housing, 1a Front door, 2 Support member, 2a 1st terminal part, 2b 2nd terminal part, 2A 2nd support member, 2Aa 3rd terminal part, 2Ab 4th terminal part, 3 Busbar, 4 4A branch conductor, 5, 5A current transformer for instrument, 6, 6A conductor, 7, 7A external cable connection terminal, 8, 8A external cable, 9, 9A zero-phase current transformer, 10 box, 11 cable box, 12 partitions, 13 boxes, 14 cable boxes, 15 housings, 16 additional housings, 100 basic units, 200, 201, 202, 203, 204 metal closed switchgear.

Claims (5)

A support member formed to hold the circuit breaker and having a first terminal connected to one terminal of the held circuit breaker and a second terminal connected to the other terminal; A bus connected to one of the first and second terminal portions via a branch conductor, and the other end of the conductor extending at the other end of the first and second terminal portions and extending through the current transformer for the instrument An external cable connection terminal connected to the housing, and when the basic unit pulls out the external cable from the lower part of the housing, the bus bar, the support member, and the instrument When the external cable is drawn out from the ceiling of the housing, the external cable connection terminal, the instrument current transformer, the support member are arranged in order from the top of the housing. Arranged in the order of the busbars Metal closed type switch gear, wherein the door.   Front operation / front maintenance system in which the bus, the support member, the current transformer for the instrument, and the external cable connection terminal are arranged in this order from the top to the bottom or the bottom to the top inside the housing. Based on this basic unit, when forming a plurality of circuits, they are arranged on the basis of the vertical position of the bus bar, or are stacked in the vertical direction with the bus bar as a common bus line. The metal closed switchgear according to claim 1.   Functional elements for one circuit including a zero-phase current transformer passing through the bus, the support member, the external cable connection terminal, and the external cable connected to the external cable connection terminal are arranged side by side inside the housing. The metal closed switchgear according to claim 1 or 2, further comprising a plurality of circuits.   A second support member for holding a second circuit breaker used in the second circuit and a second external cable connection terminal are provided on the upper part of the basic unit on which the bus bar is installed. 3. The metal closed switchgear according to claim 2, wherein the metal closed switchgear is arranged symmetrically with respect to the bus.   A third terminal portion connected to one terminal of the held second circuit breaker and a fourth terminal portion connected to the other terminal are formed so as to hold the second circuit breaker. A box containing the second support member is disposed above or below the support member of the basic unit so that the bus bar is sandwiched therebetween, and a cable box is provided on the back surface or side surface of the housing. The metal closed switchgear according to claim 2, wherein a second external cable connection terminal connected to one of the third and fourth terminal portions is accommodated in the cable box.

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