WO2002073760A1

WO2002073760A1 - Disconnection preventer for insulated wire

Info

Publication number: WO2002073760A1
Application number: PCT/JP2001/002010
Authority: WO
Inventors: Kenji Takeda; Mituyoshi Mamiya
Original assignee: Nippon Kouatsu Electric Co., Ltd.
Priority date: 1999-11-04
Filing date: 2001-03-14
Publication date: 2002-09-19
Also published as: JP2001136641A; JP4253090B2

Abstract

A disconnection preventer for insulated wire having a discharge electrode part fixed to the periphery of an insulator. In order to facilitate fixing work of the discharge electrode part, the charging side of a current limiting element (12) is connected to the insulated wire (2) side, a discharge electrode part (11) is provided on the non-charging side of the current limiting element (12), and placed on the periphery of the insulator (3) supporting the insulated wire (2) to form a discharge gap G between the discharge electrode part (11) and an earth side arm (8) or a base (5). A spiral connecting member (26) is provided at the end of the discharge electrode part (11), and the discharge electrode part (11) is wound on the peripheral surface of the insulator (3), so that the connecting member (26) is wrapped around the discharge electrode part (11).

Description

Description Insulated wire disconnection prevention device Technical field

TECHNICAL FIELD The present invention relates to a disconnection prevention device provided in an insulated wire support device of a distribution line for preventing a disconnection accident of an insulated wire.

Background art

As such a disconnection prevention device, there is a device shown in FIGS. 10 to 13 previously proposed by the present applicant (see Japanese Utility Model Publication No. 2566883).

This disconnection prevention device 101 fixes a discharge electrode portion 104 covered with an insulating material to an insulated wire 103 in the vicinity of the insulated wire support device 102 with a bind wire 105. A current limiting element 106 having a voltage non-linearity is connected to one of the discharge electrode portions 104, and an insulator locking portion 104a, which is the other of the discharge electrode portions 104, is connected to FIG. As shown in FIG. 3, it is configured such that it is bent into a U-shape with one end opened, and is elastically fitted to the outer peripheral surface of the insulator 107 of the insulated wire support device 102. The discharge electrode section 104 is formed by covering a stainless wire, a brass wire, a phosphor bronze wire, or the like with an insulating material.

Also, as shown in FIG. 11, one of the discharge electrode portions 104 is connected to the non-charge side electrode 108 closely connected to one side of the current limiting element 106, and the other of the current limiting element 106 is The charging-side electrode 109 closely connected to the side is connected to a clamp fitting 110, and the clamp fitting 110, as shown in FIG. It is connected to the needle electrode 113 which is broken and connected to the core wire 112. In addition, the insulating coating material of the discharge electrode portion 104 at the portion fitted to the insulator 107 has a discharge hole 115 force S, as shown in FIGS. An opening is formed toward the ground side (downward) of the device 102.

The outer periphery of the charging-side electrode 109, the current-limiting element 106, and the non-charging-side electrode 108 is covered with an insulating material (for example, EPT rubber or the like). The insulated wire covering material 111 of the insulated wire 103 also uses a material such as EPT rubber, for example.

Then, if there is a lightning surge, the core wire of the insulated wire 103 will be clamped. 1 1 0—Charging electrode 1 0 9 -Current limiting element 10 6—Non-charging electrode 1 0 8—Discharge electrode 1 0 4—Discharge between discharge hole 1 1 5 and base fitting 1 1 6 Gap G—Discharge (flash) along the path of the base bracket 1 16, the current-limiting element 106 constituting the discharge path interrupts the continuation arc to prevent disconnection of the insulated wire and prevent the insulator Prevents damage.

The U-shaped insulator locking portion 104a in the discharge electrode portion of the conventional disconnection prevention device is formed by bending the diameter of the outer peripheral surface of the insulator body slightly smaller than the diameter of the outer peripheral surface of the insulator body. It is pushed into the insulator 107 from the narrow neck of the insulator 107 through the opening of the part, and is attached to the insulator 107 in a hooked state so that it fits tightly on the outer peripheral surface of the insulator 107. Therefore, when mounting on insulators 107 of different diameters, a disconnection prevention device 1 using a discharge electrode 1◦4 having an insulator locking portion 104a fitted to the diameter of the insulator 107 0 1 must be used, and it is time-consuming to select a discharge electrode part with a suitable diameter from various types of discharge electrode parts on site and to install the disconnection prevention device, which is time-consuming and inefficient in the mounting work. There was a problem.

Disclosure of the invention

Therefore, an object of the present invention is to provide an insulated wire disconnection prevention device that solves the above-mentioned problem.

In order to solve the above-mentioned problems, a first aspect of the present invention is to connect a charging side of a current limiting element to an insulated wire side, provide a discharge electrode portion on a non-charging side of the current limiting element, Is disposed on the outer periphery of the insulator supporting the insulated wire, a discharge gap is formed between the discharge electrode portion and the arm or base metal fitting on the ground side, and a discharge is generated by an abnormal voltage entering at the discharge gap. A device for preventing disconnection of an insulated wire as described above, wherein the discharge electrode portion is disposed in a wound shape on the outer peripheral surface of the insulator body, and furthermore, the folded tip portion of the discharge electrode portion is directly or via a connecting member. It is characterized in that it is fixed to the base of the discharge electrode.

In the first aspect of the present invention, the discharge electrode portion may be fitted and arranged in an annular recess formed in the insulator.

In a second aspect of the present invention, a charging side of the current limiting element is connected to the insulated wire side, a discharge electrode section is provided on a non-charging side of the current limiting element, and the discharging electrode section is connected to the insulated wire. In favor of A disconnection of an insulated wire that is arranged on the outer periphery of the insulator body, forms a discharge gap between the discharge electrode portion and a ground-side arm or base metal, and generates a discharge due to an abnormal voltage that enters at the discharge gap. The discharge electrode part is arranged in a wound shape around the outer peripheral surface of the insulator body, and further, the tip end side of the folded discharge electrode part is entangled with the base part side of the discharge electrode part. This is a device for preventing disconnection of an insulated wire.

In the second aspect of the present invention, the discharge electrode portion may be fitted and arranged in an annular recess formed in the insulator.

Further, a third object of the present invention is to connect a charging side of the current limiting element to an insulated wire side, provide a discharge electrode section on a non-charging side of the current limiting element, and connect the discharge electrode section to the insulated wire. An insulator is disposed on the outer periphery of the insulator body supporting the insulator, a discharge gap is formed between the discharge electrode portion and the arm or base metal on the ground side, and an electric discharge is generated by an abnormal voltage entering the discharge gap. A device for preventing disconnection of an electric wire, wherein a spirally formed connecting member is provided at a front end of the discharge electrode portion, and the discharge electrode portion is wound around the outer peripheral surface of the insulator, and the connecting member is It is characterized by being entangled with the discharge electrode.

In the third aspect of the present invention, the discharge electrode portion may be fitted and arranged in an annular concave portion formed in the insulator.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an attached state diagram of a disconnection prevention device according to a first embodiment of the present invention. FIG. 2 is a bottom sectional view taken along line Π—Π in FIG.

FIG. 3 is a sectional view showing a current limiting element unit in the disconnection prevention device according to the present invention.

FIG. 4 is a cross-sectional view showing a mounting state of a clamp for connecting the disconnection prevention device of the present invention to an insulated wire.

FIG. 5 is a cross-sectional view showing a connection portion between a discharge electrode portion and a connection member of the disconnection prevention device according to the first embodiment of the present invention.

FIG. 6 is an attachment state diagram when the disconnection prevention device according to the first embodiment of the present invention is attached to insulators having different diameters. FIG. 7 is a mounting state diagram of the disconnection prevention device according to the second embodiment of the present invention. FIG. 8 is a sectional view taken along line VI in FIG.

9A to 9B show a third embodiment of another connecting member according to the present invention. FIG. 9A is a sectional view, and FIG. 9B is a connecting portion between the connecting member and the discharge electrode portion in FIG. 9A. FIG.

FIG. 10 is an attached state diagram of a conventional disconnection prevention device.

FIG. 11 is a sectional view showing the current limiting element unit and the clamp of FIG. FIG. 12 is a cross-sectional view of the clamp section in FIG.

FIG. 13 is a bottom sectional view showing the state of attachment of the discharge electrode portion to the insulator body in FIG.

BEST MODE FOR CARRYING OUT THE INVENTION

Next, an embodiment according to the present invention will be described with reference to FIGS. 1 to 6 show a first embodiment.

Reference numeral 1 indicates an insulated wire support device, in which an insulated wire 2 composed of a core wire 2a and an insulating covering material 2b surrounding the core wire 2a is attached to a head 3a of an insulator body 3 made of a high-pressure solid insulator. It is supported and fixed by support fittings 4 such as a binding wire and a winding grip. A plurality of folds 3 b are formed on the side surface of the insulator 3, and the insulator 3 is attached to a base arm 8, which is grounded by pins 6 and nuts 7 together with a base metal fitting 5.

Reference numeral 9 denotes a disconnection prevention device according to the present invention, which includes a current limiting element unit 10 and a discharge electrode unit 11. As shown in FIG. 3, the current limiting element unit 10 includes a current limiting element 12 made of zinc oxide (ZnO) having excellent voltage non-linearity and a metal spray such as aluminum or silver. Charged electrode 13 made of copper, aluminum, etc., which is in close contact with one end face 12a of the current-limiting element 12 applied, and is in close contact with the other end face 12b of the current-limiting element 12, which is also subjected to metal spraying. And a non-charging-side electrode 14 made of copper, aluminum, or the like, and integrally molded with an insulating member 15 such as a synthetic resin or rubber.

The charging side electrode 13 in the current limiting element unit 10 is provided with an electrode part 16 made of bolts, and the clamp part 17 is electrically and mechanically connected to the nut 18 by a nut 18. Attached to. As shown in FIG. 4, the clamp portion 17 includes a receiving portion 19 and a pressing portion 20, and a needle-shaped contact member 21 is fixed to an inner surface of the pressing portion 20. Then, by interposing the insulated wire 2 between the receiving portion 19 and the pressing portion 20 and pressing the receiving portion 19 and the pressing portion 20 toward the insulated wire 2 with the bolt 22, the contact member 2 1 Penetrates through the insulating covering material 2b of the insulated wire 2 so that the contact member 21 is electrically connected to the core wire 2a. The contact member 21 is provided with an adhesive member 23, and the adhesive member 23 repairs a hole that has been broken by the contact member 21. With such a structure, the charging-side electrode 13 in the unit section 10 is electrically connected to the core wire 2 a of the insulated wire 2 in the current limiting element.

The outer periphery of the clamp portion 17 is covered with a cover 24 made of rubber or synthetic resin, and the cover 24 is provided with a protrusion 15 a of an insulating member 15 of the current limiting element unit 10. It is detachably attached to and supported by the insulated wire 2.

The discharge electrode portion 11 is made of a conductive material such as a copper single wire or a stranded wire, an aluminum wire, a stainless wire, a brass wire, a phosphor bronze, etc., and the outer periphery of the flexible core wire 11 a is made of EPT rubber. It is formed by coating with a coating material 11b made of an insulating material such as. One side of the core wire 11 a in the discharge electrode portion 11 is electrically connected to the non-charge side electrode 14 in the current limiting element unit 10 by a screw 16 a. Further, the length of the discharge electrode portion 11 has a length from a position where the current limiting element unit 10 is disposed to a position where the insulator 3 is disposed, and a length that can make one turn around the insulator 3. It is set. As shown in FIGS. 1 and 2, the other side of the discharge electrode portion 11, that is, the discharge hole forming portion 11 c wound around the insulator 3, has a lower side when wound around the insulator 3. Discharge holes 25 are formed in the surface covering material 11b. The plurality of discharge holes 25 are formed at appropriate intervals in the line direction of the coating material 11b.

A connecting member 26 is firmly connected to the other end of the discharge electrode portion 11. The connection member 26 is harder than the discharge electrode portion 11! / A wire material such as a steel wire is formed into a spiral shape so that the spiral shape is maintained, and one side of the connection member 26 is provided with a discharge electrode portion 11. The other end is spirally wound as shown in FIG. 5, and the connection member 26 and the discharge electrode portion 11 are caulked and fixed by the caulking member 27. As the caulking member 27, for example, a cylindrical metal fitting having a C-shaped cross section is used, and this is used as a connecting part. The material 26 and the discharge electrode 11 are fitted from the side and swaged. Then, the outer peripheral portion of the overlapped connection portion between the discharge electrode portion 11 and the connection member 26 is covered with an insulation member 28 such as a tube or a heat-shrinkable tube made of an insulation material.

The connecting member 26 has an outer peripheral surface of the above-mentioned wire rod covered with an insulating material, and has a cap 26a made of an insulating material on both ends.

In order to fix the discharge hole forming portion 11c on the other end side of the discharge electrode portion 11 to the insulator 3, the discharge hole forming portion 11c is connected to the insulator 3 as shown in Figs. Fitting into an annular recess 3 c formed between the folds 3 b of 3, and making one turn while closely contacting the outer periphery of the insulator 3, the discharge electrode portion 1 1 is provided with a connection member 2 provided on the other end of the folded back electrode 1 1 6 is spirally entangled with the intermediate part 11 d of the discharge electrode part 11 on the current limiting element unit 10 side. By entanglement in this manner, the discharge electrode portion 11 and the connection member 26 are fixed to each other by contact frictional resistance between the discharge electrode portion 11 and the connection member 26, and the insulator of the discharge electrode portion 11 is formed. The wound state (attached state) on body 3 is maintained.

Further, since the discharge hole forming portion 11c of the discharge electrode portion 11 is fitted into the concave portion 3c of the insulator 3, the vertical position of the discharge hole forming portion 11c can be easily set.

At the time of fixing, the discharge hole 25 formed in the discharge electrode portion 11 is directed to the base metal fitting 5 or the arm 8 on the earth side, and the discharge hole 25 and the base metal 5 or Is to form a predetermined discharge gap G with the arm 8. In this case, the gap length of the discharge gap G is set to at least the length (position) that secures the insulation resistance (flash voltage between the charged part and the ground) specified in the extra-high voltage or high voltage distribution line.

In the case where the folds 3b of the insulator 3 are formed in the axial direction of the insulator 3 as shown in FIG. 1 and the recesses 3c are formed in the axial direction, as shown in FIG. By changing the recess 3c to be fitted, the discharge gap G can be changed, and the discharge gap G can be formed corresponding to the voltage applied to the insulating wire.

In the above configuration, if a lightning surge invades and the shock overvoltage (lightning surge) is at least larger than a predetermined flashing voltage, the base metal 5 or arm 8 on the ground side discharges. Flashing occurs at the discharge gap G formed between the electrode portion 11 and the discharge hole 25, and this surge causes the surge to occur. Lamp 1 7—Charging electrode 1 3 Current limiting element 1 2—Non-charging electrode 1 4—Discharge electrode 1 1—Discharge hole 2 5—Discharge gap G (Insulator) —Base fitting 5 or arm 8 Is quickly escaping to the earth (earth) via the discharge route of

In this case, since the current limiting element 12 is interposed in series in the above-mentioned path, the discharge (creepage) gap G of the element 12 and the insulator 3 blocks (blocks) the following flow of the commercial frequency. However, the disconnection accident of the insulated wire 2 due to the downstream arc is reliably prevented. The above operation is a case where a positive (plus) lightning surge is applied to the insulated wire 2. However, if the pole I "of the lightning surge is negative (negative), the same discharge path as above is used. In this case, the discharge current flows in the opposite direction.

FIG. 6 shows a state in which the disconnection prevention device of the present invention is attached to insulators 30 having different outer diameters.

Reference numeral 30 denotes an insulator, and as described above, the insulated wire 2 is supported and fixed to the head 30a of the insulator 30 by the support bracket 31. The insulator 30 is provided with a deep groove (not shown), and a base fitting 32 is fixed to the bottom side of the insulator 30 so as to protrude from the bottom face of the base fitting 32. The pin 33 is passed through the grounded arm 35, and the nut 34 is fastened to the pin 33, and the insulator 30 is attached to the arm 35.

The discharge electrode portion 11 of the disconnection prevention device 9 is brought into close contact with the concave portion 30 c formed by the folds 30 b of the insulator 30, and is rotated once by the same manner as described above. The member 26 is entangled and fixed to the insulator 30. Since other structures are the same as those described above, the same portions as those described above are denoted by the same reference numerals and description thereof will be omitted.

In the example of FIG. 6, the inner bottom diameter L 2 of the recess 30 c of the insulator 30 is smaller than the inner bottom diameter L 1 of the recess 3 c of the insulator 3 shown in FIG. 1. However, in this case as well, the discharge electrode portion 11 is turned around the concave portion 30 c of the insulator 30 by one turn, and the connection member 26 is shifted relative to the discharge electrode portion 11 as compared with the case of FIG. Thus, even if the insulator 30 has a small diameter, the discharge electrode can be attached to the insulator without changing the discharge electrode 11 and the connecting member 26.

Also, as a matter of course, conversely, the discharge electrode portion 11 and the connecting member 26 can be attached to the insulator having a larger diameter than the insulator 3 in FIG. 7 and 8 show a second embodiment according to the present invention.

In the second embodiment, the discharge electrode portion 11 is fixed to the insulator body 3 only by the wire forming the discharge electrode portion 11 without using the connecting member 26 of the first embodiment. is there.

That is, the discharge electrode section 11 includes a series of a discharge hole forming section 11 c, a tip section 11 e, and an intermediate section 11 d between the discharge hole forming section 11 c and the base. The discharge hole forming portion 11 c is fitted around the annular concave portion 3 c of the insulator 3 and is turned around once while being tightly attached to the outer periphery of the insulator 3. It is designed to be spirally entangled with the middle part 1 1 d. Further, a discharge hole 25 is formed below the discharge hole forming portion 11 c so as to be directed to the base metal fitting 5 or the arm 8 on the ground side, similarly to the above embodiment.

Also, similarly to the above, the discharge electrode portion 11 of the present embodiment is also made of a conductive material such as a copper single wire or stranded wire, an anolem minimum wire, a stainless steel wire, a brass wire, phosphor bronze, etc., and has flexibility. The outer periphery of the core wire 11a is covered with a covering material 11b made of an insulating material such as EPT rubber. Further, the discharge electrode portion 11 is formed to have such a hardness that the bent shape is maintained when bent.

Since other structures are the same as those of the first embodiment, the same portions are denoted by the same reference numerals as those described above, and description thereof will be omitted.

When attaching the discharge electrode section 11 to the insulator 3, the discharge hole forming section 1 1c is turned around the outer periphery of the insulator 3, and the folded tip section 1 1e is spirally wound around the middle section 1 1d. As in the previous embodiment, the discharge electrode 11 can be easily attached to the insulator 3 and the discharge electrode 11 can be attached to insulators having different diameters. Can be easily performed.

FIG. 9A-FIG. 9B show a third embodiment.

The third embodiment shows an example in which a connecting member 26A having a structure different from that of the connecting member 26 in the first embodiment is used.

That is, the connecting member 26A is formed in a meandering shape as shown in FIG. 9A in a plane, and one end of the connecting member 26A is fixed to the tip of the discharge electrode portion 11A. This fixing is performed by, for example, a caulking member 27 as shown in FIG. Also, this connection member 2 6 In A, an insulating coating is applied to a wire such as the connecting member 26 of the first embodiment, and caps 26a similar to the above are put on both ends thereof.

Since other structures are the same as those of the first embodiment, the same parts as those described above are denoted by the same reference numerals and description of the structure will be omitted.

In the third embodiment, the discharge hole forming portion 11 c of the discharge electrode portion 11 is fitted into the annular concave portion 3 c of the insulator 3, and is rotated once while being in close contact with the outer periphery of the insulator 3. The connecting member 26 A provided on the other end side of the folded back is inserted into the concave portions 26 b and 26 c of the connecting member 26 A at the intermediate portion 11 d of the discharge electrode portion 11. d is bent in a wave shape as shown in FIG. 9B, fitted and locked, and fixed to the discharge electrode portion 11.

Also in the third embodiment, as in the previous embodiment, the discharge electrode 11 can be easily attached to the insulator 3 and the discharge electrode 11 can be attached to insulators having different diameters. Can be easily performed.

Further, as a method of making the discharge hole forming portion 11 c of the discharge electrode portion 11 make one turn around the insulator 3 and fixing the tip end thereof to the intermediate portion 11 d of the discharge electrode portion 11, Alternatively, the tip of the discharge electrode portion 11 may be superimposed on the intermediate portion 11d, and the overlapped portion may be fixed with a bind wire and an insulating tape covered with insulation.

Industrial applicability

As can be understood from the above, the first aspect of the present invention is that when a lightning surge enters, the surge is rapidly discharged to ground via a current limiting element, and at the same time, The element prevents (interrupts) the insulated wire, which can reliably prevent the insulated wire from breaking due to the continuation arc. Further, when attaching the discharge electrode portion to the insulator, the discharge electrode portion is wound around the outer periphery of the insulator, and a connection member provided at the tip or end of the discharge electrode is provided. The discharge electrode can be easily attached to insulators having different diameters. This makes the work easier than in the case where a conventional disconnection prevention device having a different shape of the discharge electrode portion is selected and attached.

In the second and third aspects of the present invention, in which the tip of the discharge electrode or the connection member is spirally entangled with the discharge electrode, the mounting of the discharge electrode is performed by a tool. It can be done very easily without using In addition, by setting the discharge electrode portion by fitting it into the annular concave portion of the insulator, the mounting position can be easily set.

Claims

The scope of the claims

1. Connect the charging side of the current limiting element to the insulated wire side, provide the discharge electrode section on the non-charging side of the current limiting element, and arrange the discharge electrode section on the outer periphery of the insulator supporting the insulated wire. A device for preventing disconnection of an insulated wire, wherein a discharge gap is formed between the discharge electrode portion and a ground-side arm or base metal, and a discharge is generated by an abnormal voltage entering the discharge gap;

The discharge electrode portion is arranged in a wound shape on the outer peripheral surface of the insulator body, and the folded distal end portion of the discharge electrode portion is fixed to the base portion of the discharge electrode portion directly or via a connecting member. A device for preventing disconnection of an insulated wire.

2. The disconnection prevention device for an insulated wire according to claim 1, wherein the discharge electrode portion is fitted and disposed in an annular recess formed in the insulator body.

3. Connect the charging side of the P flow element to the insulated wire side, provide the discharge electrode on the non-charging side of the current limiting element, and place the discharge electrode on the outer periphery of the insulator supporting the insulated wire. A disconnection prevention device for an insulated wire, wherein a discharge gap is formed between the discharge electrode portion and the arm or base metal on the ground side, and a discharge is generated by an abnormal voltage entering at the discharge gap;

The above-mentioned discharge electrode portion is arranged in a wound shape around the outer peripheral surface of the insulator body, and further, the tip side of the folded discharge electrode portion is entangled with the base portion of the discharge electrode portion. Disconnection prevention device.

4. The disconnection prevention device for an insulated wire according to claim 3, wherein the discharge electrode portion is fitted and disposed in an annular recess formed in the insulator body.

5. Connect the charging side of the current limiting element to the insulated wire side, provide a discharge electrode section on the non-charging side of the current limiting element, and arrange the discharge electrode section on the outer periphery of the insulator supporting the insulated wire. A device for preventing disconnection of an insulated wire, wherein a discharge gap is formed between the discharge electrode portion and a ground-side arm or base metal, and discharge is generated by an abnormal voltage that enters at the discharge gap.

A connection member formed in a spiral shape is provided at the tip of the discharge electrode portion, and the discharge electrode portion is arranged in a wound shape on the outer peripheral surface of the insulator so that the connection member is entangled with the discharge electrode portion. A disconnection preventing device for an insulated wire.

6. The apparatus for preventing disconnection of an insulated wire according to claim 5, wherein the discharge electrode portion is fitted and disposed in an annular concave portion formed in the insulator body.