JP2015019490A - T-type terminal extension adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a T-type terminal extension adapter that allows an existing power cable of an insufficient excess length to be used and also allows the degree of freedom of a relative position between a terminal portion of the existing power cable and a T-type terminal portion to be attached to a renewed power distribution apparatus and a use condition to be enhanced.SOLUTION: A T-type terminal extension adapter 1 is constituted of a straight connection/extension adapter which has: a T-type terminal connection portion 2 to be connected to a T-type terminal portion 5 attached in a direction perpendicular to an extension direction of a power cable 101 relative to a power distribution apparatus; and a power cable connection portion 4 to be connected to a power-cable terminal portion 6 of the power cable 101. The straight connection/extension adapter comprises a main body portion, and the main body portion is constituted of a flexible power cable 3 having flexibility. The flexible cable 3 is molded between the T-type terminal connection portion 2 and the power cable connection portion 4, with sufficient dimensions and excess lengths secured for cable routing.

Description

  The present invention relates to a T-type terminal extension adapter for connecting a power distribution cable and a power cable constituting an underground distribution line.

  Traditionally, power is supplied from power stations or substations to homes and factories by connecting power distribution equipment using power cables buried directly in the ground or indirectly via manholes or pipes. There is an underground distribution line that built the track. As shown in FIG. 2, the existing power distribution device 102 of this kind of underground distribution line is provided with a linear terminal 103 to which the existing power cable 101 is attached, and the existing power cable 101 is connected via the linear terminal 103. Are connected to the existing power distribution device 102.

  By the way, with this underground distribution line for a long time of several decades, various devices and cables constituting the line are systematically updated. Therefore, when the existing power distribution device 102 is replaced with a new power distribution device, the existing power cable 101 is generally reused. As a method of reusing, there is a method of reusing by cutting the existing power cable 101 and attaching the remaining existing power cable 101 to a newly installed distribution device (hereinafter referred to as an updated distribution device). However, there is a case where the existing power cable 101 is insufficient due to a change in the connection position of the updated power distribution device.

  Therefore, as an example of means for solving the shortage of the remaining length of the existing power cable 101, as shown in FIG. 3, it can be attached to the remaining existing power cable 101 and the updated power distribution device 107 after being cut and disconnected. Replaced with a new power cable 104 that has a length that can be refilled and has a cable surplus necessary for cable handling (cable workability and cable handling), and is updated via a straight connection 105 There is a means of attaching to the power distribution device 107.

  In order to replace the new power cable 104, the T-type terminal extension adapter 106 having a structure that is attached to the updated distribution device 107 in a direction perpendicular to the extension direction of the power cable is used to connect the new power cable 104 to the updated distribution device 107. (See, for example, Non-Patent Document 1).

  The new power cable 104 has a conductor, an insulator, an internal semiconductive layer, and an external semiconductive layer having substantially the same specifications as the existing power cable 101. The new power cable 104 and the existing power cable 101 are accommodated in a hand hole 108 installed at the lower part of the updated power distribution device 107.

  Furthermore, as another example of the means for solving the shortage of the remaining length of the existing power cable 101, it can be connected to the remaining existing power cable after being cut and has a length corresponding to the cutting length of the existing power cable. A T-type terminal extension adapter and a straight-type terminal extension adapter, which are integrally provided with a linear connection adapter made of an insulator on the outside and made of a conductor such as a metal conductor tube or a conductor tube (for example, non-patent document) 1, see Patent Document 1).

IEEJ Technical Committee Materials Dielectric / Insulating Materials, Wire / Cable Joint Research Group DEI-09-049, EWC-09-002 February 19, 2009

JP 2001-231147 A

  In the conventional configuration example described in Non-Patent Document 1, it is assumed that the handhole 108 is installed in the lower part of the updated power distribution device 107 as described above, and the existing power cable 101 and the new power cable 104 are installed. Are attached via the straight connection part 105, so that the shortage of the existing power cable 101 is solved.

  Therefore, when the existing power cable 101 is buried in the ground or when the existing cable size is large, a large space and a large hand hole are required to secure the required cable bending radius. Accordingly, it is difficult to handle the cable in the hand hole 108 having a small space, and the existing power cable 101 cannot be reused.

  Further, in the configuration example of the conventional T-type terminal extension adapter described in Non-Patent Document 1 and the conventional linear terminal extension adapter described in Patent Document 1, the conductor is a rigid metal conductor tube or metal conductor tube. Since it is a linear connection extension adapter made of, since it is not flexible, it is difficult to handle the cable and it is difficult to apply it in the hand hole. Moreover, even if the excess length of the cable is solved, a large space and a large hand hole are required to secure the cable bending radius, which is a problem in terms of economy and workability.

  Furthermore, the relative positional relationship between the rising position of the plurality of existing power cables 101 and the installation position of the conventional T-type terminal extension adapter or the conventional straight-type terminal extension adapter attached to the updated power distribution device 107 is as follows: There are many different usage conditions, and there are many usage forms. For this reason, preparing a large number of terminal extension adapters with different structures suitable for the number of power cables (usually 9 to 15) increases the number of types, is not economical, and can be used for underground distribution lines. It becomes difficult.

  Accordingly, an object of the present invention is to allow the use of an existing power cable whose surplus length is insufficient, as well as the relative positional relationship and usage pattern between the existing power cable terminal unit and the T-type terminal unit attached to the updated power distribution device. An object of the present invention is to provide a T-type terminal extension adapter that can increase the degree of freedom.

  In order to achieve the above object, the present invention provides a T-type terminal connection portion connected to a T-type terminal portion attached to a distribution device in a direction perpendicular to the extension direction of the power cable, and a power cable terminal portion of the power cable. A linear connection extension adapter having a power cable connecting portion to be connected, the linear connection extension adapter including a main body portion, and the main body portion is configured by a flexible power cable having flexibility, and the flexible power cable Provides a T-type terminal extension adapter formed between the T-type terminal connection portion and the power cable connection portion in a state in which a cable can be routed and a sufficient length is secured.

  The flexible cable includes a flexible conductor made of a stranded wire obtained by twisting a plurality of small-diameter strands, an internal semiconductive layer, a flexible insulating layer made of an elastic material, an external semiconductive layer, and a protective layer. Are preferably provided sequentially.

  As the flexible cable, it is preferable that the flexible cable is previously bent into a curved shape.

  It is preferable that an insulating tube having normal temperature shrinkage is formed on the outer periphery of the power cable connecting portion and the power cable terminal portion.

  The power cable connecting portion preferably has a structure that is connected to the conductor of the power cable terminal portion with one touch.

  According to the present invention, it becomes possible to use an existing power cable whose surplus length is insufficient, and two connection portions are provided between the existing power cable terminal portion and a T-type terminal portion attached to the updated power distribution device. By providing a T-type terminal extension adapter consisting of a straight-line extension adapter for flexible power cables with sufficient dimensions and extra length to handle the cable, the relative positional relationship and the degree of use of the two terminal parts can be increased. It can be secured sufficiently.

It is side surface sectional drawing which shows the T-type terminal extension adapter which is suitable embodiment of this invention. It is a schematic explanatory drawing which shows an example of the conventional equipment installation. It is a schematic explanatory drawing which shows another example of the conventional installation in apparatus.

  Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

(Overall configuration of T-type terminal extension adapter)
In FIG. 1, reference numeral 1 generally indicates an apparatus direct connection type T-type terminal extension adapter (for example, suitable for connecting a high voltage (6.6 kV) cross-linked polyethylene insulated vinyl sheath power cable (CV cable) and a power distribution apparatus ( It is a structural example of a linear connection extension adapter. The T-type terminal extension adapter 1 is composed of a flexible power cable 3 at its main body, and two connection parts (T-type terminal connection part 2 and power cable connection part 4) at both ends of the flexible power cable 3. It is the linear connection extension adapter 1 provided with.

  The T-type terminal connection unit 2 is connected to a T-type terminal unit (T-type terminal adapter) 5 that is attached to a power distribution device in a direction perpendicular to the direction of extension of the power cable to form a first connection unit 8. The power cable connecting portion 4 is connected to the power cable terminal portion 6 to form a second connecting portion 9.

  The T-type terminal connection portion 2 includes a T-type terminal connection portion terminal 2a for compressing and connecting the flexible conductor 3a of the flexible power cable 3, and the T-type terminal connection portion terminal 2a forms a connection portion together with the flexible conductor 3a. ing. On the other hand, the power cable connecting portion 4 includes a power cable connecting portion terminal 4a for compressing and connecting the other flexible conductor 3a of the flexible power cable 3, and the power cable connecting portion terminal 4a is connected to the connecting portion with the other flexible conductor 3a. Is configured.

  When extending the flexible power cable 3 so that the straight connection extension adapter 1 which is the T-type terminal extension adapter 1 is connected between the T-type terminal unit 5 and the power cable terminal unit 6 to be in a conductive state, The flexible power cable 3 has a dimensional structure capable of cable handling (cable workability and cable handling), and is connected in a state in which a surplus length is sufficiently secured so that the cable can be handled.

  The T-type terminal extension adapter 1 (straight connection extension adapter 1) is integrated with one or both of the T-type terminal part (T-type terminal adapter) 5 and the power cable terminal part 6 in order to improve the construction efficiency. It is preferable that it is molded.

(Configuration of flexible power cable)
As shown in FIG. 1, the flexible power cable 3 extending in the middle portion between the T-type terminal portion 5 and the power cable terminal portion 6 has a flexible conductor 3 a made of a thin strand. The flexible conductor 3a is made of a twisted wire in which strands having an outer diameter of about 0.5 mm or less are twisted together in one direction or twisted by a composite twist, and is not subjected to compression molding.

  The outer periphery of the flexible conductor 3a is covered with an internal semiconductive layer (internal conductor) 3b, an insulating layer 3c, and an external semiconductive layer (external conductor) 3d by extrusion molding. As described above, the cable is provided with sufficient flexibility by the non-compression molding process with the stranded wire conductor having an outer diameter of about 0.5 mm or less. The conductor wire is made of a conductive material such as a copper wire, a copper alloy wire, an aluminum wire, or an aluminum alloy wire. In addition, the outer periphery of the outer conductor 3d is covered with a protective layer 3e such as an insulating tape or an insulating tube with a thickness within a flexible range.

  The inner conductor 3b, the insulating layer 3c, and the outer conductor 3d are made of an elastic material such as EP rubber insulation or silicone rubber, and give the cable flexibility. The inner lead 3b is extruded together with the insulating layer 3c. The outer conductor 3d can be formed by tape winding or tube coating other than extrusion molding.

  The flexible power cable 3 may have a structure and configuration different from those of the existing power cable 101, and is determined by the specifications of the underground distribution line, and the cable size is appropriately selected.

  Further, the flexible power cable 3 has a length between the T-type terminal unit 5 and the power cable terminal unit 6 in consideration of cable handling (cable workability, cable handling property) as described above. It is an indispensable configuration to set a length longer than a certain cable length, that is, a state in which a sufficient length is secured. The length of the flexible power cable 3 having this extra length is relative to the terminal position of the updated power distribution device (such as a multi-circuit switch) and the T-type terminal portion 5 attached to these devices and the power cable terminal portion 6. In terms of positional relationship, select the one that will be the optimal length for connecting them.

  In addition, the flexible power cable 3 is formed by being bent in advance so as to have a curved shape before attaching the T-type terminal extension adapter 1. The curved shape is various shapes other than a linear shape such as a bundling shape, a snake shape, an R shape, and an arc shape.

  By having the flexibility of the flexible power cable 3 and the extra length, it is deformed into, for example, an R shape in the hand hole under the updated power distribution device, so that the cable surplus is adjusted to the height of the updated power distribution device. Can absorb length. As a result, even if the cable can be stored in the handhole and the cable is cut and the remaining length is insufficient due to reuse, or the terminal position of the updated power distribution equipment is changed, the remaining length of the entire connection section Shortage can be replenished.

(Configuration of T-type terminal connection and power cable connection)
As described above, the T-type terminal connection unit 2 includes the T-type terminal connection unit terminal 2 a for compressing and connecting the flexible conductor 3 a of the flexible power cable 3, and the T-type terminal connection unit terminal 2 a is connected to the T-type terminal unit 5. The connection conductor (male terminal) 5a is connected to be in a conductive state.

  On the other hand, the power cable connecting portion 4 includes the power cable connecting portion terminal 4a for compressing and connecting the other flexible conductor 3a of the flexible power cable 3 as described above, and the power cable connecting portion terminal 4a is the power cable terminal portion 6. The power cable terminal portion 6h is connected to be in a conductive state. In addition, the power cable connection part terminal 4a is a male terminal, and is a structure connected with the power cable terminal part terminal 6h of a female terminal by one touch.

  In order to improve waterproofness and adhesion of the entire connecting portion, the power cable connecting portion 4 has a normal temperature shrinkage from the end of the flexible power cable 3 to the sheath end of the existing power cable 101. An insulating cylinder 7 is formed. The insulating cylinder 7 is made of an elastic material such as EP rubber or silicone rubber.

(Configuration of T-type terminal unit (T-type terminal adapter))
As shown in FIG. 1, a T-type terminal unit 5 which is a T-type terminal adapter 5 includes a cylindrical upper insulating layer 5c extending in the horizontal direction and a cylindrical lower insulating layer 5c extending in the vertical direction. It is configured in a mold shape. An insulating plug 5f is attached inside the upper insulating layer 5c. Inside the insulating plug 5f, a connection conductor (male terminal) 5a composed of a bolt, a nut, and a connection fitting is attached in a state of being connected to the T-type terminal connection terminal 2a, and one end side of the connection conductor (male terminal) 5a Is attached so that the detection electrode 5g can be attached and detached.

  A space is provided in the lower insulating layer 5c so that the T-type terminal connection portion 2 composed of the T-type terminal connection portion terminal 2a and the flexible conductor 3a can be inserted and connected to the connection conductor (male terminal) 5a. The inner semiconductive layer 5b and the outer semiconductive layer 5d provided on the outer periphery of the lower insulating layer 5c are integrally formed. Further, a grounding member 5h having one end fastened to the external semiconductive layer 5d with a bolt is attached to the outer periphery of the detection electrode 5g.

  In the upper insulating layer 5c on the opposite side provided with the detection electrode 5g, a space is formed so that the connection conductor (male terminal) 5a can be connected to and fixed to the connection conductor (female terminal) of the distribution device side bushing (not shown). Has been. The nut of the connection conductor (male terminal) 5a is provided with a hole for inserting a connection fitting.

  The T-type terminal unit 5 constitutes the first connection unit 8 together with the T-type terminal connection unit 2, an external semiconductive layer 5 d and a protective layer in order to improve adhesion and waterproofness with the flexible power cable 3. A protective layer 5e by tape winding is provided on the overlapping portion of the layer 3e.

(Configuration of power cable terminal)
As shown in FIG. 1, the power cable terminal portion 6 is configured in a linear shape by a power cable conductor 6 a covered with a power cable insulator 6 e and an insulating layer 6 c. The power cable conductor 6a is attached with a male terminal power cable terminal 6h and is connected to the female power cable connection terminal 4a with a single touch.

  The insulating layer 6c has an internal semiconductive layer 6b provided with a space inside so that the power cable terminal portion terminal 6h and the power cable connecting portion terminal 4a can be connected with one touch, and an external portion provided on the outer periphery of the insulating layer 6c. The shielding layer 6d is integrally formed. A ground wire 6f is attached to the external shielding layer 6d. On the end of the power cable terminal and the sheath of the existing power cable 101, a protective layer 6g is provided by winding a waterproof tape.

  This power cable terminal portion 6 constitutes the second connection portion 9 together with the power cable connection portion 4 as described above, and from the end of the flexible power cable 3 in order to improve the adhesion and waterproofness of the entire connection portion. An insulating tube 7 having room temperature shrinkage is formed across the entire outer periphery of the sheath end of the existing power cable 101.

(Installation work of T-type terminal extension adapter 1)
The attachment work of the T-type terminal extension adapter 1 that is connected between the updated power distribution device 107 and the existing power cable 101 and is connected is performed by the following process.

  In the first step, as shown in FIG. 1, the T-type terminal connection portion 2 and the T-type terminal portion 5 are connected to produce the first connection portion 8.

  In the first step, first, a straight connection extension adapter 1 (T-type terminal) obtained by assembling and molding two connection parts of a T-type terminal connection part 2 and a power cable connection part 4 in a flexible power cable 3 having a surplus length. A T-type terminal portion 5 having a male terminal connection conductor 5a is connected and attached to the T-type terminal connection portion 2 of the extension adapter 1). In this connection, the T-type terminal connection part terminal 2a of the T-type terminal connection part 2 is brought into contact with the connection conductor 5a of the T-type terminal part 5 with no gap and is fixed.

  Next, the outer semiconductive layer 3d and the protective layer 3e of the flexible power cable 3 are provided so as to extend and overlap the outer periphery of the outer semiconductive layer 5d on the flexible power cable 3 side of the T-type terminal portion 5. Further, the protective layer 3e which is the outermost layer of the overlapped portion and an insulating tape are wound around the protective layer 3e to integrally form the protective layer 5e of the T-type terminal portion 5. Thereby, the production of the first connection portion 8 is completed. In addition, this 1st process can be prepared by implementing beforehand before the attachment operation | work of T-type terminal extension adapter 1. FIG.

  In the next second step, as shown in FIG. 1, the power cable connecting portion 4 and the power cable terminal portion 6 are connected to produce a second connecting portion 9 (straight line connecting portion 105).

  In order to accommodate the T-type terminal extension adapter 1 in the hand hole, for example, the flexible power cable 3 is bent into a curved shape in advance in an R shape. In addition, this 2nd process can be prepared by implementing beforehand before the attachment operation | work of the T-type terminal extension adapter 1. FIG.

  In the second step, the power cable terminal 6 is connected and attached to the existing power cable 101. In this connection, the power cable terminal portion terminal 6h of the power cable terminal portion 6 is inserted into and attached to the power cable connection portion terminal 4a of the power cable connection portion 4 so that the connection is fixed with one touch. A connection member is formed by integrally forming the inner semiconductive layer 6b, the insulating layer 6c, and the outer shielding layer 6d so as to cover the outer periphery of the power cable connection terminal 4a and the power cable terminal 6h.

  Next, the protective layer 6g is formed by tape-wrapping an insulating tape on the end of the connecting member of the power cable terminal 6 and the sheath of the existing power cable 101. After that, the room temperature shrinkable insulating cylinder 7 is inserted into the entire outer periphery of the protective layer 6g, the end of the flexible power cable 3 on the power cable connecting part 4 side, and the sheath of the existing power cable 101 end. Install.

  Finally, the connection conductor 5a of the male terminal of the T-type terminal unit 5 is fitted to the power distribution device bushing (not shown) of the updated power distribution device 107 so as to be attached to the existing power cable 101 in a direction perpendicular to the extension direction. By these steps, the updated power distribution device 107 of the T-type terminal extension adapter 1 is connected to the existing power cable 101, and all the installation work is completed and the conductive state is established.

(Effect of embodiment)
The above embodiment has the following effects.

(1) The T-type terminal extension adapter 1 can be selected to an optimum length in accordance with the relative positional relationship between the T-type terminal adapter 5 (T-type terminal unit 5) and the power cable terminal unit 6 and the usage pattern. Adopted by being attached to many kinds of power distribution equipment.
(2) Since the main body portion of the T-type terminal extension adapter 1 is composed of a flexible flexible power cable 3 having a surplus length, it is attached to the rising position of the existing power cable 101 and the updated power distribution device 107. Even if the relative positional relationship with the position of the T-type terminal adapter 5 is different for each terminal, it is possible to connect with one type of T-type terminal extension adapter 1, so that a prior investigation of the relative positional relationship is unnecessary, and the power cable Fine adjustment of the length at the time of manufacture becomes unnecessary.
(3) Since the main body portion of the T-type terminal extension adapter 1 is composed of a flexible flexible power cable 3 having a surplus length, or is pre-curved into an R shape, the cable is routed ( The workability of the cable and the handleability of the cable are improved, the workability is improved, and the space for the construction site is further reduced, resulting in an economic effect.

  As is clear from the above description, the above-described embodiment and illustrated examples illustrate typical examples of T-type terminal extension adapters. Therefore, the present invention is not limited to the above-described embodiments and illustrated examples, and naturally includes a technical range that can be easily changed by those skilled in the art from the embodiments and illustrated examples.

DESCRIPTION OF SYMBOLS 1 ... T type terminal extension adapter (straight connection extension adapter), 2 ... T type terminal connection part, 2a ... T type terminal connection part terminal, 3 ... Flexible power cable, 3a ... Flexible conductor, 3b, 5b, 6b ... Internal semiconductive layer, 3c ... insulating layer, 3d, 5d ... external semiconductive layer, 3e, 5e, 6g ... protective layer, 4 ... power cable connecting part, 4a ... power cable connecting part terminal, 5 ... T-type terminal part ( T-type terminal adapter), 5a ... connecting conductor (male terminal), 5c ... upper insulating layer (lower insulating layer), 5f ... insulating plug, 5g ... detection electrode, 5h ... grounding member, 6 ... power cable terminal, 6a ... Power cable conductor, 6c ... Insulating layer, 6d ... External shielding layer, 6e ... Power cable insulator, 6f ... Ground wire, 6h ... Power cable terminal part, 7 ... Insulating tube, 8 ... First connecting part, 9 ... 2nd connection part, 101 ... Existing power cable, 102 ... Existing distribution machine , 103 ... linear terminal, 104 ... new power cable, 105 ... linear connecting portion, 106 ... T-type terminal extension adapter, 107 ... update distribution equipment, 108 ... hand hole

Claims (5)

A linear connection extension having a T-type terminal connection portion connected to a T-type terminal portion attached in a direction perpendicular to the extension direction of the power cable to the power distribution device, and a power cable connection portion connected to the power cable terminal portion of the power cable Consisting of an adapter,
The linear connection extension adapter includes a main body portion,
The main body portion is composed of a flexible power cable having flexibility, and the T-type terminal connection portion and the power cable connection portion in a state in which the flexible power cable secures a dimension and an extra length that allow the cable to be routed. T-type terminal extension adapter, characterized in that it is molded between the two.   The flexible power cable includes a flexible conductor made of a stranded wire obtained by twisting a plurality of small-diameter strands, an internal semiconductive layer, a flexible insulating layer made of an elastic material, an external semiconductive layer, and a protective layer. And a T-type terminal extension adapter according to claim 1.   The T-type terminal extension adapter according to claim 1 or 2, wherein the flexible power cable is formed by bending in advance into a curved shape.   The T-type terminal according to any one of claims 1 to 3, wherein an insulating tube having a normal temperature shrinkage is formed on an outer periphery of the power cable connecting portion and the power cable terminal portion. Extension adapter.   The T-type terminal extension adapter according to any one of claims 1 to 4, wherein the power cable connection portion is configured to be connected to a conductor of the power cable terminal portion with a single touch.

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