JPH0879917A - Lead-in wire connection structure for cubicle - Google Patents

Abstract

PURPOSE: To eliminate the need for forming a bend in an outer cable by connecting the outer cable laterally with a second joint of a connector, substantially raising the outer cable from the L-shaped connector, and then connecting the outer cable through a first joint and a vertical lead-out wire with a machine in a cubicle. CONSTITUTION: An outer cable 14 is connected through an L-shaped connector 22 and a vertical lead-out wire 20 with a joint 18 in a cubicle 10 without forming any bend. Since a conventional space for accommodating the bend of cable is not required in the cable pit of a cubicle, the cubicle can be installed at a relatively low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead-in wire connection structure for drawing a high-voltage power supply into a cubicle for hermetically housing a high-voltage power receiving facility.

[0002]

2. Description of the Related Art When a high-voltage electric wire is drawn into a relatively small-scale high-voltage private customer such as a store or town factory, maintenance is easy, a dedicated power receiving room is not required, and the reliability of safety is high. For this reason, generally, a cubicle that is a box body for hermetically housing various types of high-voltage power receiving devices is used. FIG. 2 is a front view schematically showing a conventional connection structure of a high-voltage cable drawn into such a cubicle. When the high-voltage cable 2 extending from the high-voltage power supply is pulled into the cubicle 1, if the high-voltage cable 2 is given a small curvature, the high-voltage cable 2 may be damaged to impair its electrical insulation. Therefore, the high-voltage cable 2 drawn into the cubicle 1 from below the floor surface 3 on which the cubicle 1 is installed has a large slack portion 5 in the cable pit 4 formed on the floor surface 3 so as to have a margin. After being formed, the inside of the cubicle 1 was raised in the vertical direction, and the tip end connecting portion 6 was connected to the connecting portion 7 formed at the upper portion of the inside of the cubicle 1.

[0003]

However, in order to accommodate the slack portion 5 of the high-voltage cable 2, a relatively large space is required, which increases the installation cost of the cubicle to secure this space. Therefore, it is an object of the present invention to provide a cubicle drop wire connection structure capable of installing a cubicle at a lower cost.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a vertical lead wire extending downward from a connection portion of equipment inside a cubicle. Further, the cubicle has a first connecting portion to which a vertical lead wire is connected from above in the cubicle, and is electrically connected to the first connecting portion and extends laterally in a cable pit formed in a lower portion of the cubicle. An L-shaped connector is provided in its entirety having two connecting parts. An external cable is laterally connected to the second connection portion of the connector.

[0005]

In the cubicle lead-in wire connection structure of the present invention,
The external cable is connected laterally to the second connector of the connector, is substantially raised by this L-shaped connector and is connected to the connector and its first connector from above. It is connected to the internal equipment in the cubicle via a vertical lead wire.

[0006]

The present invention will be described in detail below with reference to the illustrated embodiments. FIG. 1 is a front view schematically showing a cubicle lead-in wire connection structure according to the present invention. Cubicle 10
A cable pit 16 for drawing the external cable 14 extending from the high-voltage power supply side into the cubicle 10 is formed on the floor 12 on which the external cable 14 is installed, and the external cable 14 is drawn into the cubicle 10 via the cable pit 16. Has been.

In the upper part of the cubicle 10, there is provided a connecting portion 18 of, for example, a circuit breaker on the power supply side to a device such as a transformer or a switch accommodated in the cubicle. A vertical lead wire 20 composed of a cable connected to the connection portion at its upper end is coupled to the connection portion 18. At the lower end of the vertical lead wire 20, a first L-shaped connector 22 is provided which is opened upward and is open upward.
Is connected to the connection part 24 from above. The second connecting portion 26 of the connector 22 extends laterally in the cable pit 16, and the second connecting portion 26 receives the external cable 14 at the second connecting portion 26.
The tip of is connected.

FIG. 3 is a vertical sectional view showing details of the connector 22 shown in FIG. As shown in FIG. 3, the connector 22 includes an L-shaped tubular housing 28 as a whole and an insulating tube 30 arranged in the housing. Vertical lead wire 20 received from the upper open end of the insulating tube 30.
The compression connection terminal 32 is fixed to the lower end of the conductor 20A. The first connecting portion 24 of the connector 22 is provided with a plug 36 made of a conductor having a recess 34 whose upper end is opened to receive the compression connecting terminal 32. The plug 36 and the compression connecting terminal 32 are connected to each other. A tubular leaf spring contact 38 for ensuring electrical contact between the two is disposed in between.

At the lower end of the vertical lead wire 20 made of a cable, an insulating portion 40A that contacts the insulating layer 20B of the cable and a semi-conductive layer that contacts the semi-conductive layer 20C of the cable similar to those used in the conventional cable connecting portion. A stress cone 40 having a portion 40B is provided. Further, a spring assembly 46 for pressing the stress cone 40 against the tapered surface 44 of the insulating cylinder 30 via the pressing member 42 is provided. The shield layer 20D below the sheath 20E of the vertical lead wire 20 passes through the shield wire 48 and then the external cable 14
Is connected to the shield layer 14D.

The vertical lead wire 20 is connected to the first connecting portion 2
The compression connection terminal 32 is securely inserted into and in contact with the plug 36 of No. 4 and is connected to the connector 22 by a fastener 52 composed of a bolt and a nut at a mounting flange 50A of the casing 50.

The conductor 14A of the external cable 14 has a second
The connection conductor 54 of the connection portion 26 is fixed. A through hole 58 for receiving the shaft portion of the bolt 56 is formed at one end of the connection conductor 54. A bolt 56, which is a male screw member arranged in the through hole 58, is screwed into a female screw hole 60 formed at the lower end of the plug 36, and the connection conductor 54 is electrically connected to the plug 36 by tightening the bolt 56. It will be fixed in the fixed state.

On the outer circumference of the external cable 14, a spacer 6 having an insulating layer 62A and a semiconductive layer 62B corresponding to the insulating layer 14B and the semiconductive layer 14C of the cable, respectively.
2 is provided on the shield layer 14D below the sheath 14E,
The shield wire 48 is connected. In addition, the connection conductor 54
A semi-conductive layer 64 for obtaining an even electric field is also provided on the stepped portion, and a semi-conductive rubber tape 66 and a protective layer 68 made of a tape or a shrink tube are provided.
The connecting conductor 54 extends laterally from the lower surface of the plug 36,
The conductor 14A of the external cable 14 is compressed and connected to the conductor 14A in a hole 54A formed at the tip thereof. As a result, the external cable 14 is started up in the cubicle 10 via the connector 22 and is safely and reliably connected to the device-side connecting portion 18 via the vertical lead wire 20.

In the connection structure shown in FIGS. 1 and 3, the external cable 14 is connected to the connection portion 18 in the cubicle 10 through the connector 22 and the vertical lead wire 20 without forming a bent portion. Can be connected to. Therefore, the conventional large space for accommodating the bent portion of the cable in the cable pit of the cubicle 10 becomes unnecessary.

4 and 5 are a front view and a side view, respectively, showing another embodiment of the cubicle lead-in wire connection structure according to the present invention. In the example shown in FIGS. 4 and 5,
As the vertical lead wire 20, a bus bar for large current is used. Further, as clearly shown in FIG. 5, three bus bars 20 (U, V, W) are arranged in parallel for three phases, and each bus bar 20 has an L level.
Two external cables 14 are connected via the letter-shaped connector 70, and a large current from each of the two external cables 14 is guided to the bus bar 20 of each phase.

FIG. 6 shows the connector 7 shown in FIGS. 4 and 5.
It is a longitudinal cross-sectional view which shows the detail of 0. The connector 70 includes an L-shaped insulating cylinder 72 as a whole, and the outer surface of the insulating cylinder 72 is covered with a semiconductive layer 74. A stress-combining tube 76 made of a semiconductive material for relaxing an electric field is attached to the outer periphery of one end opened above the insulating cylinder 72, and the end connected to the lower end of each bus bar 20 is attached to this end. The conductor terminal 78 constituting the one connection portion 24 is received. A reduced diameter portion 78A is formed in the lower half portion of the conductor terminal 78, and a male screw portion 80 is formed at the tip thereof.

At the other end of the insulating cylinder 72 which is opened in the lateral direction,
First and second conductor terminals 82A and 82B, respectively
Is arranged. At one end of the first conductor terminal 82A,
Through hole 84A for receiving reduced diameter portion 78A of conductor terminal 78
Is formed, and is inserted into the reduced diameter portion 78A so as to contact the shoulder portion of the reduced diameter portion 78A. A screw hole 84B is formed at one end of the second conductor terminal 82B,
The male screw portion 80 of the conductor terminal 78 is screwed into the screw hole 84B. A spacer 86 surrounding the reduced diameter portion 78A is arranged between the first and second conductor terminals 82A and 82B, and by tightening the male screw portion 80, both conductor terminals 82A.
And 82B are firmly fixed to the conductor terminal 78 which is the first connecting portion 24. The spacer 86 can be made of an insulating material, but is preferably made of a conductive material in order to ensure electrical contact between the conductor terminals 78 and 82.

Each of the conductor terminals 82A and 82B extends in the lateral direction, and the external cable 14 is compression-connected to the respective tips. As a result, both external cables 14 are connected to the second
Is connected to the conductor terminal 78 forming the first connecting portion 24 via the conductor terminals 82A and 82B forming the connecting portion 26 of FIG. Further, in connection with both external cables 14, the spacer 62 having the insulating layer 62A and the semiconductive layer 62B, the shield wire 48, the semiconductive layer 64, which are similar to those shown in FIG.
A semiconductive rubber tape 66 and a protective layer 68 are provided. Therefore, the both external cables 14 are started up in the cubicle 10 via the connector 70, and are safely and reliably connected to the connection portion 18 on the device side via the vertical lead wire 20 composed of a bus bar.

The connection structure shown in FIGS. 4 to 6 is most suitable for pulling in a large current, and even when such a large current is pulled in, the cable 14 is connected to the external cable 14 without forming a bent portion. Since it can be connected to the connecting portion 18 in the cubicle 10 via the connector 22 and the vertical lead wire 20, a large space for accommodating the bent portion of the cable in the cable pit of the cubicle 10 is not required. Therefore, the cubicle can be installed at a relatively low construction cost. In the example shown in FIGS. 4 to 6, the example in which two external cables are associated with one bus bar has been described, but one bus bar has one external cable.
A book or three or more external cables can be appropriately connected.

[0019]

As described above, in the cubicle lead-in wire connection structure according to the present invention, the external cable is substantially started up via the L-shaped connector to which the external cable is connected. It is not necessary to form a bend in the external cable as in the conventional case. Therefore, a large space for accommodating the large slack portion of the external cable can be eliminated in the cable pit, which can reduce the installation cost of the cubicle.

[Brief description of drawings]

FIG. 1 is a front view schematically showing a cubicle lead-in wire connection structure according to the present invention.

FIG. 2 is a front view schematically showing a conventional cubicle lead-in wire connection structure.

FIG. 3 is a vertical cross-sectional view showing details of the connector shown in FIG.

FIG. 4 is a view similar to FIG. 1, showing another embodiment of the cubicle lead-in wire connection structure according to the present invention.

5 is a side view schematically showing the cubicle lead-in wire connection structure shown in FIG. 4. FIG.

6 is a vertical sectional view showing details of the connector shown in FIGS. 4 and 5. FIG.

[Explanation of symbols]

 10 cubicle 14 external cable 16 cable pit 18 connection part 20 vertical lead wire 22, 70 connector 24 first connection part 26 second connection part

Claims (3)

[Claims] 1. A vertical lead wire extending downward from a connection portion of a device inside a cubicle, and a first connecting portion to which the vertical lead wire is connected from above inside the cubicle, and the first connection. An L-shaped connector having a second connecting part electrically connected to a portion and extending in a lateral direction in a cable pit formed in the lower part of the cubicle, and the first part of the connector from outside the cubicle. A cubicle lead-in wire connection structure including an external cable that is laterally connected to the second connecting portion and is electrically connected to the lead-out wire. 2. The vertical lead wire is composed of a bus bar, and the first connection part to which the lower end of the bus bar is connected is provided with a conductor terminal having a male screw part extending in a vertical direction, and the external cable is connected to the first connection part. The cubicle lead-in wire connecting structure according to claim 1, wherein the second connecting portion includes a connecting terminal in which a screw hole to be screwed into the screw portion of the conductor terminal is formed. 3. The vertical lead wire is a cable having a compression connection terminal fixed to a lower end thereof, and the first connection portion comprises:
The second connecting portion has a plug made of a conductor that receives the compression terminal from above, and the second connecting portion has one end coupled to the lower end of the plug via a male screw member and the other end extending in the lateral direction to the end of the external cable. The cubicle lead-in wire connection structure according to claim 1, wherein the connection conductors are compression-connected.