JPH031854Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an insulator used to support electric wires in power distribution lines.

The purpose is to provide a support insulator that can be installed and used with simple work, and that can protect electric wires and other members from lightning surges in that state.

The drawings showing the embodiments of the present application will be described below. In FIG. 1, an arm 2 is attached to a utility pole 1, as is well known, and to the arm 2 are attached insulators 3, 3' for supporting power distribution lines. Another arm 4 is attached to the arm 2, and a support insulator 5 is attached to the arm 4. On the other hand, telephone pole 1
Further, another cross arm 6 is attached to which a transformer 7, a high voltage cutout 8, a supporting insulator 9, etc. are attached. The distribution line supported by the pin insulator 3 and the high voltage cutout 8 are connected by a high voltage underline 10 supported by support insulators 5 and 9. The arms 2, 4, 6, etc. are grounded as is well known.

Next, a description will be given of FIGS. 2 to 7 showing details of the magnetic insulator 3'. The insulator body 11 of the insulator 3' has an insulator body 12. This insulator body 12 is formed hollow and has a storage space 13 inside. Further, an electric wire support portion 14 is formed in an annular shape on the outside of the insulator body 12, and an electric wire, that is, a main line 70 of a high-voltage distribution line can be fixed thereto with a bind wire 15. Furthermore, deep grooves 16 are formed on the outer surface of the insulator body 12, as is well known. A cap fitting 17 is covered at one end of the insulator body 12, and is fixed together with an adhesive 18 such as cement. A lower terminal 17a made of stainless steel is attached to the inside of the cap fitting 17, and the lower terminal 17a is caulked to the insulator body 12. Further, a well-known gasket 19 and an O-ring 19' are interposed between the insulator body 12 and its lower terminal 17a. A mounting portion 20 is attached to the center portion of the cap fitting 17. The mounting portion 20 consists of a bolt 21 welded and fixed to the cap metal fitting 17 and a nut 22 threaded onto the bolt 21, so that the insulator 3' can be attached to the arm 2. On the other hand, an upper terminal 23 is attached to the upper end of the insulator body 12. This terminal 23 has a brim-shaped head 24, and is fixed to the insulator body 12 using a packing 25, a washer 26, and a nut 27 so as to seal the internal space 13, and is further filled with epoxy resin. agent 26'
It is filled with water to make it waterproof. Above upper terminal 2
A connecting fitting 28 is screwed onto the connecting fitting 28, and one end of a lead wire 29 is crimped and connected to the connecting fitting 28, and a well-known stress cone 30 is formed around the connecting fitting 28.

Next, the arrester element 34 provided in the storage space 13 will be explained. Head 2 of upper terminal 23
A cap-shaped discharge electrode 35 is attached to the lower surface of 4, and another cap-shaped discharge electrode 36 is opposed to the discharge electrode 35 with a spacing member 37 in between. A discharge gap G is formed between them. The spacer 37 is made of a porcelain insulating material with a high dielectric constant, such as cordierite. A current limiting element 38 is provided on the lower surface of the discharge electrode 36.
is attached. Two current limiting elements 38 are used in a state where they are connected in series, and each element is made of a voltage nonlinear material such as zinc oxide.
A plate-shaped contact fitting 39 is brought into contact with the lower surface of the current limiting element 38 . A push spring 40 is interposed between the contact fitting 39 and the lower terminal 17a. By biasing the contact fitting 39 upward in FIG. 3, the push spring 40 maintains the positional relationship between the above-described members in the storage space 13 in the state shown in FIG. , upper terminal 2
3 and the electrode 35 as well as the electrode 36,
Good electrical continuity is maintained between the current limiting element 38 and the metal fitting 39. Reference numeral 41 denotes a connecting piece, for example, a strip-shaped thin copper piece is used, one end of which is connected to the spring 40.
By locating the other end between the spring 40 and the lower terminal 17a such that the other end is inserted between the spring 40 and the metal fitting 39, the electrical continuity between the lower terminal 17a and the metal fitting 39 is improved. It is used like this. Incidentally, silver (or aluminum) is sprayed on the upper and lower end surfaces of the current limiting element 38, respectively, to form the electrode 36 and the metal fitting 3, respectively.
9 to ensure good electrical continuity.

Next, the connector 43 attached to the tip of the lead wire 29 (generally a coated wire of about 1 to 2 m is used) will be described in detail with reference to FIGS. 4 to 7. The base 44 of the connector 43 is made of a metal material. The base body 44 has an insertion hole 45 for passing the electric wire through and an introduction groove 46 for guiding the conductor thereto.
It is formed into a U-shape. Insertion hole 4
A concave receiving surface 47 is provided on the lower surface of 5 to accommodate the electric wire.
It is becoming. Further, a threaded portion 48 is provided on the upper outer periphery of the base body 44, and a male thread is formed there. On the other hand, a connection body 49 is provided at the bottom of the base body 44.
is fixed. The connecting body 49 is made of a metal material, and has a male threaded portion 50 provided at its intermediate portion that is screwed onto the base body 44 . Also, this connection body 4
9 is provided with a needle-shaped connecting piece 51 protruding into the insertion hole 45 at one end, and a connecting portion 52 for crimp connection at the other end. The core wire 29a of the lead wire 29 is crimped and connected to this connecting portion 52. The lower part of the base 44, the connection part 52 and the lead wire 29
The end portions of each are integrated with each other by a reinforcing body 53, and the reinforcing body 53 is made of an insulating material to provide an insulating coating. The reinforcing body 53 is made of an insulating material such as butyl rubber. Next, the clamping body 55 provided in the introduction groove 46 so as to be vertically movable is formed of a metal material, and its lower surface is formed in a concave shape to serve as a pressing surface 56. The clamping body 55 also has engaging portions 57, 57 projecting from the groove 46. An engaging piece 58 is attached to the upper part of the clamping body 55 with a fastener 59. As this fastener 59, a rivet or a screw is used. An annular fastener 60 is provided between the engaging portion 57 and the engaging piece 58 so as to be rotatable relative to the clamping body 55 . This fastener 60 is constructed with a nut, and the female thread on the inner peripheral surface thereof is threadedly engaged with the male thread of the threaded portion 48. The fitting 43 also has a surrounding cover 65. This cover is constructed into two halves, upper and lower, and one edge of the flanges 66, 66 provided on each opposing surface is formed integrally with each other to form a hinge part 67; At the opposite edge, both flanges 66, 66 are integrally connected by a plurality of fasteners 68. The cover 65 is made of an insulating material such as rubber or polyethylene, and its lower part is placed over the outside of the reinforcing body 53 as shown in FIGS. 4 to 6.

Next, the procedure for using the above insulator 3' will be explained. First, as is well known, the main body 1 is attached to the armrest 2 using the attachment part 20. Next, the distribution line 70 is attached to the wire support part 1
4 with a binding line 15 as shown in FIG. 2 (well-known pull-through support).

Next, the connector 43 is connected to the electric wire 70. The connection is made as follows. First, cover 65
At the same time as opening the upper part of the holder, the clamping member 55 is removed from the base body 44 by loosening the fastener 60. After that, the electric wire is introduced from the introduction groove 46 toward the insertion hole 45. After that, the clamping body 55 is inserted into the introduction groove 46, and the fastening tool 60 is screwed into the threaded portion 48. Then, by rotating the fastener 60, the clamping body 55 is fixed as shown in FIGS.
Move it downward in the diagram. As a result, the electric wires are sequentially pushed toward the insertion hole 45 by the pressing surface 56. As a result, the needle-like connection piece 51
The core wire 70a is penetrated through the coating 70b at 0 and penetrates into the core wire 70a. Also, in that state, the wire is on the receiving surface 4.
7 and the pressing surface 56, the connecting tool 43 is fixed to the electric wire 70. After that, the upper part of the cover 65 is attached to the base body 44 and the clamping body 55.
etc., and the upper part and the lower part are interconnected with a stopper 68. In the above case, the connection piece 51
Even if the tip of the connecting piece 51 does not come into contact with the core wire 70a, if it is very close to it, the insulation between the connection piece 51 and the core wire 70a will be broken when a lightning surge enters, as will be described later, and the conduction between them will be maintained. can be achieved. In this specification, this state is also referred to as electrical connection.

When a high voltage due to a lightning surge enters the electric wire 70 in the above device state, the high voltage is applied to the gap G via the connecting piece 51, the connecting portion 52, the lead wire 29, etc. Then, a discharge occurs in the gap G, and the high voltage is applied to the gap G, the current limiting element 38,
It is transmitted to the arm 2 via the metal fitting 39, the connecting piece 41, the lower terminal 17a, the cap metal fitting 17, and the connecting portion 20, and is further released to the earth via the arm 2.
As a result, the voltage of the electric wire 70 is kept low, and accidents such as dielectric breakdown of the insulator 3' are prevented.
In addition, when the high voltage is released to the ground as described above, even if a follow-on current from the commercial power source is to occur, the presence of the current-limiting element 38 in the current-carrying path prevents the follow-on current from occurring. . Note that the connection piece 51
may be provided protruding from the clamping body 55. Alternatively, the arrester element 34 may have only the current limiting element 38 and not the discharge gap G.

Next, FIG. 8 showing a different embodiment of the present application will be described. This figure shows an example in which, instead of using the cross arm 2 as a structure, a case of a pole-mounted transformer is used as a structure and the insulator is attached to it. In the figure, a case 72 of a pole transformer 71 is grounded and consists of a main body 73 and a lid 74. The main body 73 and the lid 74 are the tightening fittings 7
5. They are mutually fixed by eye bolts 76. A support piece 77 made of a metal material is inserted between the metal fitting 75 and the eye bolt 76.
The main body 11e of the insulator 3'e is attached to the support piece. Further, a draw wire 10e is fixed to the main body 11e, and a connecting tool 43e is connected to the output wire 7 of the transformer.
It is connected to 8.

In such a state of use, when a lightning surge enters the lead wire 78, it can be grounded through the transformer case 72, and dielectric breakdown of the transformer can be prevented.

It should be noted that the same reference numerals as those in the previous figure are appended with an alphanumeric letter "e" for parts that are functionally the same or equivalent to those in the previous figure, and redundant explanations are omitted.
(Furthermore, in the following figures, the same idea is applied in order, and the alpha alphabets f and g are attached in order to omit redundant explanations.) Next, Figures 9 and 10 show the locations where the insulators with the above configuration are used. This shows a still different example, in which the insulator having the above structure is used as the insulator 9 for supporting the underline in FIG. Further, FIG. 9 shows an example in which the connector 43f is connected to the lead wire of the transformer 7f, and FIG. 10 shows the connector 43g connected to the lead wire 1.
An example is shown in which it is connected to 0g.

As described above, in the present application, the lower part of the columnar insulator body 12 is provided with a conductive attachment part 20 for fixing the insulator body 12 to a cross arm, and the side surface of the insulator body 12 is provided with an electric wire. In the support insulator equipped with a fastening part 14 for fastening, the base of a lead wire 29, which has a connecting tool 43 at the tip for connecting to an electric wire, is fixed to the center of the top of the insulator body 12. Furthermore, an arrester element 34 having one end connected to the mounting portion 20 and the other end connected to the base of the lead wire 29 is built inside the insulator 12, and the base of the lead wire 29 is connected to the base of the lead wire 29. The connector 43 is covered with a stress cone-shaped insulating material, and the front surface of the connector 43 is designed to form an insertion hole 45 for inserting the electric wire and an introduction groove 46 for guiding the electric wire to the insertion hole 45. The base body 44 has a U-shaped shape, and the base body 44 is provided with a tightening tool for pressing the electric wire inserted into the insertion hole 45 against a receiving surface 47 that is the bottom of the groove when viewed from the introduction groove 46. 60 is attached to the base body 44, and the base body 44 is further provided with a needle-shaped connecting piece 51 at one end,
A connecting body 49 made of a metal material with a deep hole-shaped connecting piece 52 at the other end is connected to the receiving surface 4 with the needle-shaped connecting piece 51.
7 protrudes toward the electric wire, and the deep hole-shaped connection piece 52 is provided so as to protrude to the opposite surface, and further, the lead wire 2
With the tip of the core wire 29a of No. 9 inserted into the deep hole, the peripheral wall of the deep hole is compressed and connected, and the connection piece 5 is connected to the circumference of a part of the base 44 and the deep hole-shaped connection piece 5.
2 and around the tip of the insulating coating of the lead wire 29, a reinforcing body 53 is formed surrounding the three parts with an insulating material so that the three parts are integrated with each other.
Since it is surrounded by the surrounding area, it has the following unique effects. (a) Electric wires 70 in structures such as armrests and transformer cases
When it is desired to support the insulator 3', there is an advantage that the main body 11 of the insulator 3' can be fixed to the structure and the electric wire 70 can be fixed to the main body 11 to support the electric wire in an insulated state.

(b) On the other hand, when a lightning surge occurs in the supported electric wire and it is desired to release it to the ground, the lightning surge is transmitted to structures such as the arm 2 and the transformer case 72 through the lead wire 29 and the arrester element 34. , can be grounded through these structures, and has the effect of preventing the voltage of the electric wire from increasing abnormally and preventing dielectric breakdown of the insulator body.

(c) Moreover, even if it has the effects of (a) and (b) above, that is, it needs to be both mechanically fixed and electrically connected to the structure, it cannot be installed on the structure. It has the advantage that it is sufficient to simply attach the insulator body 11 to the structure. Firstly, it requires only one installation process, which speeds up the work.Secondly, it can be used even in small spaces because it only takes up the space of one insulator. effective.

(d) Furthermore, since the connection to the electric wire 70 only requires connecting the connector 43, when the electric wire 70 is fixed to the main body 11 after the installation in (c) above, and then the electric wire 70 is connected. , regardless of whether the wire is supported in a fixed or extended state,
This has the advantage that electrical connections can be easily made to it.

(e) Furthermore, in the case of (d) above, if the connection point of the connector 43 cannot be found near the insulator because the electric wires are congested, the above connection can be made because the lead wire 29 is present. It is also possible to find a point at a remote location, giving it flexibility in that it can be used in accordance with the actual situation at the place of use.

(F) When connecting the connector 43 to the electric wire, insert the insertion hole 4
Simply place the wire on the connector 5 and press the wire against the receiving surface 47 using the clamp 60.
There is also an effect on the connection work that the fixing of the cable 3 and the electrical connection between the electric wire and the core wire 29a of the lead wire can be performed at the same time.

(G) Moreover, in order to obtain the above-mentioned effect on the connection work, the wire is configured so that the needle-like portion 51 at one end of the connecting body 49 is pierced, so that rainwater flows from the wire through the needle-like portion 51 and reaches the connecting portion 52. Even in this case, the core wire 29a of the lead wire is inserted into the deep hole, and the periphery of the deep hole is sealed by the integrally molded reinforcing body 53, so that there is no possibility that the rainwater will reach the core wire 29a. This is extremely effective in preventing rainwater from passing between the insulation coating on the outer periphery of the lead wire and the outer periphery of the core wire and reaching the arrester element 34 due to capillary action.

(H) Furthermore, since the reinforcing body 53 integrally surrounds the base body 44, the connecting piece 52, and the tip of the lead wire 29, the reinforcing body 53 can be attached to the grip when attaching the base body 44 to the electric wire. There is also an effect that it can be used as a tool, and there is also an operational effect that can make the above-mentioned installation work easier.

As described above, the present invention improves workability when attaching electric wires to the insulator equipped with the arrester element and connecting the arrester element 34 and the electric wires via the lead wires 29, as well as protection against rain after attachment, countermeasures against lightning strikes, etc. This is a very useful idea from a practical standpoint, as it allows problems to be solved at the same time.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a diagram showing the attachments on the upper part of a utility pole, FIG. 2 is a diagram showing an insulator in a wire supporting state, and FIG. 3 is an enlarged cross-sectional view along the - line.
Figure 4 is a longitudinal sectional view of the connector, Figure 5 is a sectional view taken along the - line in Figure 4, Figure 6 is a sectional view of only the cover at the - line position, Figure 7 is a plan view of the connector, 8
Figures 1 to 10 are diagrams showing examples in different usage states. 11...Insulator body, 14...Wire support part, 20
... Mounting part, 34 ... Arrester element, 29 ... Lead wire, 43 ... Connection tool.

Claims (1)

[Scope of utility model registration request] The columnar insulator body 12 has the insulator body 1 at its lower part.
In the supporting insulator, the supporting insulator is provided with a conductive attachment part 20 for fixing the electric wire to the cross arm, and a fastening part 14 for fixing the electric wire on the side surface of the insulator body 12. The base of a lead wire 29, which has a connector 43 at its tip for connecting to an electric wire, is fixed to the center part, and one end is connected to the mounting part 20 at the other end inside the insulator body 12. A built-in arrester element 34 is connected to the base of the lead wire 29, and the base of the lead wire 29 is covered with a stress cone-shaped insulating material. The insertion hole 45 and the insertion hole 4
The base body 44 has a U-shaped front face so as to form an introduction groove 46 for guiding the electric wire into the insertion hole 45. A fastener 60 is attached to the base body 44 to press it against the receiving surface 47 which becomes the bottom of the groove when viewed from 46. Furthermore, the base body 44 has a needle-like connecting piece 51 at one end and a deep hole-like connecting piece 51 at the other end. The connecting body 49 formed of a metal material as the connecting piece 52 is connected to the needle-shaped connecting piece 5.
1 protrudes from the receiving surface 47 toward the electric wire, and the deep hole-shaped connection piece 52 is provided so as to protrude to the opposite surface, and further, for the deep hole-shaped connection piece 52,
With the tip of the core wire 29a of the lead wire 29 inserted into the deep hole, the peripheral wall of the deep hole is compressed and connected, and the connection piece 52 is connected to the periphery of a part of the base 44 and the deep hole-shaped connecting piece 52. A reinforcing body 53 is provided surrounding the three parts, including the periphery and the tip of the insulating coating of the lead wire 29, so that the three parts are surrounded by an insulating material so that the three parts are integrated with each other. An insulator equipped with an arrester element characterized by: