JP2004015990A - Cable terminal connecting part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cable terminal connecting part that can easily be accommodated to kinds of electric power apparatuses, laying conditions of cables and the like. <P>SOLUTION: The cable connecting part comprises a bushing fixed to the electric apparatus and a connecting conductor that is insulating-coated by the bushing. The bushing and the connecting conductor are divided in a coalesceable manner so as to separate in an apparatus connecting side and a cable connecting side. The split bushing at the apparatus connecting side constitutes a terminal of one of an in-gas terminal, an in-oil terminal and an in-air terminal. The split bushing at the cable connecting side constitutes a connecting part of one of a straight connecting part, an L-shaped connecting part and a branched connecting part. By properly combining and coalescing constitutions of the split bushing at the apparatus connecting side and the split bushing at the cable connecting side, the cable terminal connecting part can easily be accommodated to the kinds of the electric apparatuses, the laying conditions of the cables and the like. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a cable terminal connection portion suitable for connecting a power cable to a power device such as a gas insulated switch (GIS) and a transformer in oil.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, when a power cable is connected to a power device, for example, a cable termination connection unit as shown in FIG. 4 is configured. That is, in FIG. 4, a bushing 2 fixed to a casing 1 of a power device is formed into an L shape by an insulating material such as an epoxy resin, and insulates a connection conductor 3 provided inside. The connection conductor 3 has a device connection portion 4 connected to a power device at one end and a cable connection portion 6 connected to a power cable 5 at the other end.
The bushing 2 is provided with a circumferential groove on the outer circumference, and the casing 1 of the power device is fitted and fixed in the circumferential groove.
An opening is provided in the cable connection portion 6 of the connection conductor 3, and the end of the cable conductor 7 that has been subjected to the terminal treatment and exposed is inserted into the opening, and is inserted through a stress cone 8, a push fitting 9, and the like. Thus, the connection of the power cable 5 is performed by performing a joining process in a conventional manner.
[0003]
[Problems to be solved by the invention]
By the way, the above-mentioned conventional technology has the following problems to be solved.
In the above-described cable terminal connection portion, the positional relationship between the power device and the cable is determined, and one cable can be attached only in the specified direction.
However, depending on the power equipment, it is necessary to attach two cables, and the structure of the terminal located in the power equipment may be any of the well-known gas end, oil end, and air end. Structure may be required.
[0004]
For this reason, conventionally, as shown in, for example, Japanese Patent Application Laid-Open No. 4-141968, two cable connection portions having a cable conductor receiving opening are provided at one end of a connection conductor in advance, and these are connected to one another. It is also used for power equipment for connecting two cables and for power equipment for connecting two cables.
Then, when using this in a power device of a type that connects only one cable, only one cable connection portion is used, and a plug is inserted into the opening of the other cable connection portion and a lid is put on. And taking other measures.
[0005]
However, when such a dual-purpose cable termination connection portion is used for a power device to which one cable is connected, it has an unnecessary structure and is therefore bulky and uneconomical. In addition, it does not meet the requirements for other structures of the bushing located in the power equipment, that is, any of the structures of the terminal in the gas, the terminal in the oil, and the terminal in the air.
In addition, it was necessary to be able to manufacture various types of terminal connection portions in advance so as to be able to respond to the type of power equipment, the installation status of cables, and the like.
[0006]
The present invention has been made in view of the above points, and an object of the present invention is to provide a cable terminal connecting portion that can easily cope with a type of a power device, a cable installation situation, and the like.
[0007]
[Means for Solving the Problems]
The present invention employs the following configuration to achieve the above object.
<Configuration 1>
A cable comprising: a bushing fixed to a power device; and a connection conductor insulated by the bushing and having a device connection portion connected to the power device at one end and a cable connection portion connected to the cable at the other end. A cable terminal connection part, wherein the bushing and the connection conductor are divided so as to be combined into a device connection side and a cable connection side, respectively.
[0008]
<Configuration 2>
2. The cable terminal connection section according to claim 1, wherein an insulating spacer having rubber-like elasticity is interposed on the divided surface of the bushing.
[0009]
<Configuration 3>
3. The cable terminal connection according to claim 2, wherein the bushing is made of epoxy resin, and the insulating spacer is made of silicone rubber.
[0010]
<Configuration 4>
In the cable terminal connection part according to any one of the constitutions 1 to 3, the split bushing on the device connection side constitutes any one of a terminal part in gas, a terminal part in oil, and a terminal part in air. A cable termination connection section, characterized in that:
[0011]
<Configuration 5>
In the cable terminal connection section according to any one of the constitutions 1 to 4, the split bushing on the cable connection side constitutes any one of a straight connection section, an L-shaped connection section, and a branch connection section. A cable termination connection, characterized in that:
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described using specific examples.
FIG. 1 is a longitudinal sectional view showing one embodiment of a cable terminal connecting portion of the present invention.
Here, a description will be given by taking a T-shaped branch end connection part in gas as an example. As shown in FIG. 1, the connection portion is formed by insulatingly covering a connection conductor 10 with a bushing 11, and a device connection portion 12 connected to a power device at one end of the connection conductor 10, and two power It has two cable connection portions 13 and 14 connected to the cable, respectively.
[0013]
The bushing 11 and the connection conductor 10 are divided into two parts so that they can be united so as to be divided into a device connection side and a cable connection side.
The split surface 15 of the split connection conductor has a joint structure in which electrical conduction is achieved by linearly inserting the other conductor end into a recess provided on one conductor end surface.
[0014]
The cable connection portions 13 and 14 at one end of the connection conductor 10 are provided with two openings 16 and 17 branched at an angle of 90 degrees so that two power cables can be connected to each other. These openings have a well-known shape suitable for inserting a cable conductor and connecting in a conventional manner. The device connection portion 12 at the other end of the connection conductor also has a known shape suitable for connection to a power device.
[0015]
As a molding material of the bushing 11, an epoxy resin having excellent electrical insulation properties, moldability, mechanical strength, and the like is used. However, when the epoxy resins are brought into direct contact with each other on the divided surface of the divided bushing made of epoxy resin, the boundary surface between the two becomes liable to be damaged. The problem is that the electrical insulation properties cannot be maintained. For this reason, it is desirable to interpose an insulating spacer 18 made of an insulating material having rubber-like elasticity on the divided surface of the bushing.
Although the insulating spacer 18 has a disk shape in this embodiment, if the shape of the divided surface of the bushing is different, the insulating spacer 18 has a structure adapted to the shape.
[0016]
The insulating spacer may be formed of silicone rubber, EP rubber, fluorine rubber, or the like, but silicone rubber and EP rubber are preferable in consideration of the dielectric constant, and silicone rubber is preferable in consideration of the dielectric breakdown strength at high temperatures. Is most preferred.
Silicone rubber has characteristics equivalent to those of EP rubber in terms of dielectric breakdown characteristics and dielectric constant, and can maintain a certain level of rubber elasticity for a long period of time even when compressed at a high temperature of 105 degrees Celsius.
[0017]
The split bushing 11A on the device connection side is configured at the gas end portion having a known structure, and the split bushing 11B on the cable connection side is configured as a T-shaped branch connection portion having a well-known structure.
The split bushing on the device connection side is provided with a circumferential groove 19 on the outer circumference, and the casing 1 of the power device is fitted into the circumferential groove 19 and fixed.
After the divided bushings and the connection conductors are combined, they are fixed by tightening a plurality of mounting bolts 20 mounted on the outer surface of the bushing, and the two are electrically and mechanically connected to each other.
[0018]
Although the above embodiment is configured as described above, by removing the mounting bolt 20, the type of power equipment such as an aerial panel, a gas insulated switch (GIS), an oil submersible transformer, and a narrow cable can be reduced. The split bushing on the device connection side can be replaced with a well-structured one in oil or air, depending on the installation status, withstand voltage application status, or the like. In addition, the split bushing on the cable connection side can be replaced with a straight or L-shaped connection portion having a well-known structure according to the state of attachment of the cable.
[0019]
In other words, FIG. 2 shows a cable terminal connecting portion obtained by combining a device configured on the terminal end in oil as a split bushing on the device connecting side and a device configured on the L-shaped connecting portion as a split bushing on the cable connecting side. ing. In FIG. 2, the same reference numerals are given to parts common to FIG.
As shown in FIG. 2, this cable terminal connection portion is configured such that the connection conductor 10 is insulated and covered with an elongated bushing 11 for oil, and one end of the connection conductor 10 is connected to one power cable. Each has a connection portion 13.
[0020]
The bushing 11 and the connection conductor 10 are divided into two parts so that they can be united so as to be divided into a device connection side and a cable connection side. The split surface 15 of the split connection conductor has a joint structure in which electrical conduction is achieved by linearly inserting the other conductor end into a recess provided on one conductor end surface. An insulating spacer 18 is interposed on the divided surface of the bushing.
[0021]
The cable connection portion 13 at one end of the connection conductor 10 is provided with an opening 16 for connecting one power cable. These openings 16 have a well-known shape suitable for inserting cable conductors and connecting them in a conventional manner. The device connection portion 12 at the other end of the connection conductor also has a well-known shape suitable for connection with a submersible power device.
[0022]
Further, FIG. 3 shows a cable terminal connecting portion formed by combining a device configured on the aerial terminal portion as a split bushing on the device connecting side and a device configured on a T-shaped branch connecting portion as a split bushing on the cable connecting side. Is shown. In FIG. 3, parts common to those in FIG. 1 are denoted by the same reference numerals.
As shown in FIG. 3, this cable terminal connection portion is formed by insulatingly covering the connection conductor 10 with a bushing 11 made of a porcelain tube, and connecting one end of the connection conductor 10 to a device connection portion 12 connected to an aerial power device. The other end is provided with two cable connection portions 13 connected to two power cables.
[0023]
The bushing 11 and the connection conductor 10 are respectively divided into two so as to be united so as to be divided into a device connection side and a cable connection side, and the division surface 15 of the divided connection conductor is formed in a concave portion provided on one conductor end surface and the other. Are electrically connected to each other by inserting the conductor end portions thereof in a straight line.
[0024]
The cable connection portion 13 at one end of the connection conductor 10 is provided with two openings 16 and 17 branched at an angle of 180 degrees so that two power cables can be connected to each other. These openings 16 and 17 have a well-known shape suitable for inserting a cable conductor and connecting in a conventional manner. The device connection portion 12 at the other end of the connection conductor also has a well-known shape suitable for connection with an aerial power device.
[0025]
In the connection portion shown in FIGS. 2 and 3, the material of the insulating spacer 18, the peripheral groove 19 provided on the outer periphery of the divided bushing 11A on the device connection side, a plurality of attachments for combining the divided bushing and the connection conductor are provided. The bolts 20 have the same meaning as those of the structure shown in FIG.
[0026]
【The invention's effect】
As described above, the bushing and the connection conductor are divided into the device connection side and the cable connection side so that they can be freely connected to and separated from each other. By appropriately combining them, it is possible to easily cope with the type of power equipment, the installation status of cables, and the like.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing one embodiment of a cable terminal connecting portion according to the present invention.
FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention.
FIG. 3 is a longitudinal sectional view showing a third embodiment of the present invention.
FIG. 4 is a longitudinal sectional view showing a conventional cable terminal connection portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Casing 2 Bushing 3 Connection conductor 4 Device connection part 5 Power cable 6 Cable connection part 7 Cable conductor 8 Straight cone 9 Press fitting 10 Connection conductor 11 Bushing 12 Equipment connection parts 13 and 14 Cable connection part 15 Connection conductor division surface 18 Insulation Spacer 19 circumferential groove

Claims (5)

A cable comprising a bushing fixed to a power device, and a connection conductor insulated by the bushing and having a device connection portion connected to the power device at one end and a cable connection portion connected to the cable at the other end. At the termination connection,
A cable terminal connection part, wherein the bushing and the connection conductor are divided so as to be combined into a device connection side and a cable connection side. The cable termination connection according to claim 1,
A cable terminal connecting portion, wherein an insulating spacer having rubber-like elasticity is interposed on the divided surface of the bushing. The cable termination connection according to claim 2,
The cable terminal connection section, wherein the bushing is made of an epoxy resin and the insulating spacer is made of silicone rubber. In the cable terminal connection part according to any one of claims 1 to 3, the split bushing on the device connection side constitutes any one of a terminal part in gas, a terminal part in oil, and a terminal part in air. A cable termination connection, characterized in that: 5. The cable terminal connection according to claim 1, wherein the split bushing on the cable connection side forms one of a straight connection, an L-connection, and a branch connection. 6. A cable termination connection section, characterized in that:

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