JP6190957B2 - Switchgear - Google Patents

Description

  The present invention relates to a metal-closed switchgear used for a switchboard or the like, and more particularly to connection of an external cable drawn from the outside of a housing to the inside.

An external cable is drawn into the metal-closed switchgear constituting the power distribution facility in order to receive power from the outside of the casing or to supply electricity to the load. Electricity drawn from the external cable flows to the main bus line through a switching device such as a circuit breaker for interrupting current, and a measuring transformer such as a current transformer and a zero-phase current transformer (ZCT). Electricity flowing to the main bus flows through other metal closed switchgears arranged in a line to an external cable for supplying electricity, and electricity is supplied to the load.
Generally, to connect a high-voltage external cable to a conductor in the panel such as a circuit breaker connection bushing, the external cable is fixed to a cable bracket, which is a support hardware, with a cushioning material, and connected by a cable terminal attached to the cable conductor. I take the. Generally, one or a plurality of three-phase three-core cables are used as the external cable. Since the R-phase, S-phase, and T-phase conductors are arranged at regular intervals in order to maintain insulation, the cable terminals are connected to the R-phase and T-phase terminal connection portions arranged on both sides of the S-phase. Requires bending the cable conductor. However, if the cable conductor is bent suddenly, the internal wiring is damaged and there is a risk of disconnection, so a large bending dimension is required. As a result, a long terminal distance for bending the cable conductor must be ensured between the cable bracket and the cable terminal. In order to solve the above-mentioned problem, for example, there is one in which a metal object is directly attached to a ZCT, a cable is supported and fixed collectively on the metal object, and a terminal distance is shortened by eliminating a cable bracket (for example, Patent Document 1). reference).

Japanese Unexamined Patent Publication No. Sho 63-31409 (Pages 1 and 2, FIGS. 1 to 4)

  In the switchgear as described above, the effect of integrating the cable bracket with the ZCT can be obtained, but in order to connect the cable conductor to the R-phase and T-phase cable terminals arranged on both sides of the S-phase, a cable is required. Step bending of the conductor is necessary. That is, in the example of Patent Document 1, in order to ensure the insulation between the cables with respect to the cable conductor extending upward from the ZCT, the distance between the cable conductors is increased so that the distance between the cable conductors increases upward. Bend the cable conductor at the top. In addition, while adjusting the angle so that the direction of the cable terminal provided at the tip of the external cable is in the vertical direction with respect to the connection portion of the external cable that is vertically spaced apart from the upper part in the housing The cable conductor is bent with a large bending radius. As described above, since the bending must be performed at two places in total, there is a problem that the bending work remains, and the reduction of the height dimension is limited due to the existence of the bending places.

  An object of the present invention is to obtain a metal closed switchgear that is improved in workability and can be reduced by further reducing the bent portions of the cable conductor as described above and shortening the terminal distance from the cable bracket to the cable terminal. To do.

The switchgear according to the present invention includes an external cable composed of a plurality of cable conductors that are drawn into the interior of the housing that houses the electrical equipment and provided with cable terminals at the ends of the switchgear, and the external cable is placed near the lead-in portion. A cable bracket to be fixed to the body, a terminal connecting portion for electrically connecting the cable terminal to the electric device, and a connecting member made of a conductor interposed between the terminal connecting portion and the cable terminal. provided, connecting member in a fixed state with respect to the terminal connecting portion, the bonding surface between the cable terminals, is bent along the straight line connecting the terminal connecting portion and the cable bracket, and a plurality of cable conductors Is composed of an R phase, an S phase, and a T phase, and the connection member corresponding to the R phase, the S phase, and the T phase has a connecting surface of the S phase connection member, the connection surface of the R phase and the T phase connection member. Joint surface Also be extended such that the position shifted in the depth direction of the housing, connecting portions of the three phases of the connecting member and the cable terminal is one that has a triangular arrangement.

  According to the present invention, in a state where the connection member is fixed to the terminal connection portion, the joint surface of the connection member with the cable terminal is bent along a straight line connecting the terminal connection portion and the cable bracket. Thus, the bent portion of the cable conductor can be suppressed to one location near the cable bracket, and the plurality of cable conductors are all linear up to the cable terminal at the tip. Therefore, the workability is improved, and the cable conductor can be connected only by securing the necessary minimum terminal distance for the insulation distance of the cable conductor, and the switch gear can be reduced.

It is a principal part side view which shows roughly the cable connection part of the metal closed type switchgear which concerns on Embodiment 1 of this invention. FIG. 2 is a rear view schematically showing a cable connecting portion shown in FIG. 1. It is a perspective view of the connection member used for T phase among the connection members shown by FIG. FIG. 3 is a development view of the connection member shown in FIG. 2. It is a principal part side view which shows roughly the cable connection part of the metal closure type switchgear which concerns on Embodiment 2 of this invention. FIG. 6 is a top view schematically showing the cable connecting portion shown in FIG. 5. It is a perspective view of the connection member used for S phase among the connection members shown by FIG.

Embodiment 1 FIG.
FIG. 1 is a side view of a principal part schematically showing a cable connection part of a metal closed switchgear according to Embodiment 1 of the present invention, and FIG. 2 is a rear view schematically showing the cable connection part shown in FIG. 3 is a perspective view of a connection member used for the T phase among the connection members shown in FIG. 2, and FIG. 4 is a development view of the connection member shown in FIG. As shown in the drawing, in the metal closed type switchgear, the external cable 1 is drawn into the cable chamber 81 of the housing 8 from the outside such as the lower part of the floor, for example, and the cable bracket 2 which is a support metal in the vicinity of the drawn-in part. Is fixed to the housing 8. In this example, the external cable 1 is composed of three cable conductors 11 (11R, 11S, and 11T) of R phase, S phase, and T phase corresponding to three-phase alternating current. Cable terminals 3 are provided respectively. The cable terminal 3 is connected to an electrical device (not shown) such as a switch or a transformer, one end of which is installed inside the housing 8, and the other end of the cable terminal 3 is provided apart from each other in the housing. The connection conductor 4 is electrically and mechanically connected to a terminal connection portion 5 of the connection conductor 4 via a connection member 6 having a substantially L-shaped cross section.

  As shown in FIG. 2, the connecting member 6 has an extension direction of the joining surface 6b with the cable terminal 3 with respect to the extending direction of the joining surface 6a with the terminal connecting portion 5, as shown in FIG. Is bent along a straight line connecting Specifically, when the plate-like connection piece 31 of the R-phase (or T-phase) cable terminal 3 located on both sides in FIG. 2 is brought into contact with the joint surface 6b of the connection member 6, the cable conductor 11R. (Or the cable conductor 11T) is bent with an angle that is substantially in a straight line between the terminal connecting portion 5 and the bending portion indicated by the arrow A at the top of the cable bracket 2. FIG. 3 shows a bent shape of a T-phase connecting member as an example, and FIG. As shown in FIG. 4, the connecting member 6 before processing is provided with a plurality of bending lines R1 to R4. Here, the bending member Rb1 is bent along the bending line R3 so that the angle is inclined in the oblique direction as shown in FIG. The connected connecting member 6 is created.

  In the illustrated example, the joint surface 6 a with the terminal connection portion 5 is formed in a flat shape, but is not limited thereto, and in short, the connection member 6 is fixed to the terminal connection portion 5. In this case, the extending direction of the joint surface 6 b of the connecting member 6 with the cable terminal 3 may be bent along a straight line connecting the terminal connecting portion 5 and the cable bracket 2. The bending angle is appropriately selected based on the plurality of bending lines R1 to R4, and the bending angle of the cable conductor 11 is increased or decreased. When the connection member 6 corresponding to the other cable conductors 11R and 11S is prepared in the same manner and the cable terminals 3 of the respective phases are connected, as shown in FIG. From the cable conductor 11 to the cable terminal 3 provided at the tip of the cable conductor 11 is linear within the housing 8. In the present invention, the cable terminal 3 is installed at a position where bending is performed with a large bending radius in a conventional cable conductor. As a result, the bending portion of the cable conductor 11 is only one portion indicated by an arrow A in the upper part of the cable bracket 2 in FIG. 2, and bending that is curved with a large bending radius in the vicinity of the cable terminal 3 that is conventionally required is unnecessary. Thus, the vertical distance required to provide the bend can be shortened. Therefore, the distance from the upper part of the cable bracket 2 to the cable terminal 3 at the tip of the cable conductor 11 can be shortened, and the position of the terminal connection part 5 can be reduced. It becomes possible to install in the lower part of a figure, and the dimension of the height direction of the housing | casing 8 can be reduced rather than before.

  Further, the connection member 6 having a substantially L-shaped cross section is not necessarily limited to the one formed by bending a plate material at an angle in an oblique direction as shown in FIG. For example, a conductor shape with a desired angle may be realized by joining two rectangular parallelepiped conductors by brazing. It is also possible to adjust to an appropriate angle by twisting the conductor. As described above, the connecting member 6 may have a structure that allows the cable conductor 11 to be connected in a substantially straight line from the cable terminal 3 to the cable bracket 2 regardless of how the conductor is bent. Further, the connecting member 6 may be integrated with the connecting conductor 4. In that case, a connection partner connected to an electrical device such as a switch, for example, that omits the connection conductor 4 shown in FIG. 1 has the function of the terminal connection portion 5.

  In the figure, the switchgear casing 8 shows only the main part, and for example, the circuit breaker chamber, the circuit breaker operating mechanism and the operation panel are not shown. The right direction in FIG. 1 is the depth direction of the housing. Needless to say, the number of external cables 1 and cable conductors 11 and the configuration of the external cable 1 are not particularly limited. For example, the external cable 1 may be a cable conductor 11. Moreover, although the case where the cable terminal 3 was connected to the one joint surface 6b of the connection member 6 as shown in FIG. 2 was demonstrated, it does not necessarily need to be one side and the cable terminal 3 is a joint surface of both surfaces of the connection member 6. Similarly, in the case of being connected to 6b, the bending portion of the external cable 1 or the cable conductor 11 can be suppressed to one location.

  In the first embodiment configured as described above, the cross section provided between the terminal connection portion 5 of the connection conductor 4 and the cable terminal 3 connected to the electrical device installed inside the casing is omitted. In a state where the L-shaped connecting member 6 is fixed to the terminal connecting portion 5, the extending direction of the joint surface 6 b with the cable terminal 3 is along a straight line connecting the terminal connecting portion 5 and the cable bracket 2. By bending the cable conductor 11 in this way, the cable conductor 11 is bent at the cable bracket 11 for securing the insulation between the cable conductors 11 with respect to the cable conductor 11 constituting the external cable 1 extending from the cable bracket 2 to the top of the figure. 2 is one bending point indicated by an arrow A in FIG. Therefore, the bending shape of the cable conductor 11 in the cable connection work is simplified, and the time for the connection work is shortened.

  As described above, according to the first embodiment, it is not necessary to adjust and connect the cable conductor 11 to the cable terminal 3 not only in the depth direction but also in the width direction. Can be suppressed to only one bending portion for securing the insulation between the cable conductors 11 from the cable bracket 2 to the upper side of the figure. Therefore, the cable conductor 11 can be connected only by securing the necessary minimum terminal distance for the cable insulation distance, and the metal closed switchgear can be reduced. In addition, since the cable conductor 11 can be connected to the cable conductor 11 with a minimum bent portion and a simple bent shape, the workability of the cable connection is remarkably improved.

Embodiment 2. FIG.
FIG. 5 is a side view of a main part schematically showing a cable connection part of a metal closed switchgear according to Embodiment 2 of the present invention, and FIG. 6 is a top view schematically showing the cable connection part shown in FIG. FIG. 7 is a perspective view of a connection member used for the S phase among the connection members shown in FIG. In the figure, the terminal connection portion 5 is provided at the end in the depth direction (right direction in FIG. 6) of the current transformer 7 in which a through conductor (not shown) is installed in the horizontal direction. And the connection member 6 interposed between the terminal connection part 5 and the cable terminal 3 provided in the front-end | tip of the cable conductor 11 (11R, 11S, 11T) respond | corresponds to R phase, S phase, and T phase. Of the connecting members 6R, 6S, and 6T to be connected, only the joining surface of the S-phase connecting member 6S is closer to the depth direction of the housing 8 than the joining surface of the R-phase connecting member 6R and the joining surface of the T-phase connecting member 6T. Has been stretched. The shapes of the R-phase and T-phase connection members 6R and 6T are the same as those of the R-phase and T-phase connection members 6 in the first embodiment. In connection with it, the connection part for the three phases of the connection member 6 and the cable terminal 3 has a triangular arrangement. The triangular arrangement indicates an arrangement state in which a line segment connecting the center points of the three-wire cable terminals 3 is triangular.

  In the case of the second embodiment, the cable bracket 2 and the terminal connection portion 5 are also used for the S-phase cable terminal 3 by using the bending of the connection member 6S, similarly to the R-phase and T-phase cable terminals 3. The cable conductor 11S is bent and adjusted in position so as to be substantially straight. FIG. 7 shows a perspective view of the bent shape of the connecting member 6 for adjusting the position of the S-phase cable terminal 3. Unlike the R-phase and T-phase connecting members 6R and 6T, the connecting member 6S is shown in FIG. Bend in parallel to the width direction of the conductor without bending it diagonally. Specifically, a connection member bent in parallel in the width direction can be realized by bending at a position corresponding to the bending line R1 indicated by a dotted line in the development view of the conductor in FIG. 4, and the bending angle of the connection member 6S is adjusted. Then, the position of the cable terminal 3 is adjusted.

  In the second embodiment configured as described above, in addition to the same effects as those of the first embodiment, the connection position between the S-phase cable terminal 3 and the connection member 6S as shown in FIG. By shifting in the direction extending in the depth direction only, the insulation distance between the cable terminals 3 can be secured more than when the cable terminals 3 are arranged side by side, so that the cable chamber 81 is made more compact. It becomes possible.

  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. For example, the shape and type of the electrical device housed in the housing 8 and the terminal connection portion 5 for electrically connecting the cable terminal 3 to the electrical device are not limited. Further, the drawing position of the external cable 1 may be the upper surface of the housing, for example, and a plurality of drawing positions may be provided, and a plurality of cable brackets 2 may be provided accordingly.

1 External cable, 11 (11R, 11S, 11T) Cable conductor,
2 Cable bracket, 3 cable terminals, 31 connection piece,
4 connecting conductor, 5 terminal connecting portion, 6 (6R, 6S, 6T) connecting member,
6a joint surface, 6b joint surface, 7 current transformer, 8 housing, 81 cable room,
R1, R2, R3, R4 Bending lines.

Claims (2)

An external cable composed of a plurality of cable conductors that are drawn from the outside to the inside of the housing that houses the electrical equipment and provided with cable terminals at the ends thereof, and a cable bracket that fixes the external cable to the housing in the vicinity of the drawing portion And a terminal connection part for electrically connecting the cable terminal to the electrical device, and a connection member made of a conductor interposed between the terminal connection part and the cable terminal, In the state where the connection member is fixed to the terminal connection portion, a joint surface with the cable terminal is bent along a straight line connecting the terminal connection portion and the cable bracket , and a plurality of the connection members are bent. The cable conductor is composed of an R phase, an S phase, and a T phase, and the connection member corresponding to the R phase, the S phase, and the T phase has a joint surface of the S phase connection member, The three-phase connecting portions of the connecting member and the cable terminal are arranged in a triangular shape so as to be shifted from the joint surface of the R-phase and T-phase connecting members in the depth direction of the housing. switch gear, characterized in that it has become.   2. The switchgear according to claim 1, wherein the connection member is made of a plate material in which a joint surface with the cable terminal is integrally bent with respect to a joint surface with respect to the terminal connection portion.

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