JPH09330780A - Discharge electrode device for insulated wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily insulate a needle electrode to prevent the stress corrosion, simplify the structure to reduce the cost, and improve the working property by providing a groove on the inside of an insulating cover, and fitting an O-ring to the tip part of the needle electrode. SOLUTION: A groove 12 capable of fitting a binding wire is provided on the inner surface of an upper cover 5 forming an insulating cover. An O-ring or packing 16 closely fitted between the coating part 4a of an insulated wire and the upper surface 13b of a contact electrode part 13 when a needle electrode is brought into contact with the core wire 4b of the insulated wire is fitted to the tip part 14a of the needle electrode. Since the ring 16 makes close contact with the part 4a of the insulated wire and the upper surface of the part 13 only by fastening the part 3 to the insulating cover, the needle electrode can be easily insulated, and penetration of rainwater from the part 4a can be eliminated to prevent the stress corrosion of the core wire and the needle electrode. Further, the structure can be simplified to reduce the cost, and the working property can be also improved since the discharge part 15 of the part 13 of a discharge electrode device can be provided in a position precisely opposed to a grounding electrode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support insulator in which the insulated wire of a high-voltage power distribution line is tightly bound by a binding wire to a grasping portion of the head of the support insulator to support the same, and the support wire is close to or attached to the support insulator. The present invention relates to the improvement of the discharge electrode device of the insulator protection device used as described above.

[0002]

2. Description of the Related Art In a high voltage distribution line using insulated wires,
As shown in FIG. 17, an insulator protection device 100 is attached near the support insulator 107. Generally, the above insulator protection device 1
Reference numeral 00 denotes a configuration in which a current limiting element unit 103 and a ground electrode 104 are provided on a mounting bracket 102 attached to the bottom surface side of a support insulator 107, and a discharge electrode device 106 is provided on an insulated wire 105, which propagates through a distribution line. An abnormal voltage such as a lightning surge is discharged from the discharge electrode device 106 to the ground electrode 104,
The insulator 107 is adapted to be protected by flowing it through the armband 101 to the ground. At the time of this discharge, the commercial frequency follow-up current is cut off by the current limiting element unit 103 interposed in the discharge path.

As shown in FIG. 18, the discharge electrode device 106 has an insulating cover 108 for the outer periphery of the insulated wire 105.
Insulation compound of semi-fluid insulation material 1 all around the inner surface of
The insulating cover 108 is attached via the insulating wire 108, and the tip portion 111a of the needle electrode 111 provided on the contact electrode portion 110 attached to the insulating cover 108 is connected to the insulated wire 105.
The covering portion 105a is pierced to make contact with the core wire 105b.

[0004]

By the way, in the above-mentioned conventional discharge electrode device 106, the needle electrode 111 of the contact electrode portion 110 fixed to the insulating cover 108 prevents the charging portion such as the needle electrode 111 from being exposed. Insulated wire broke through 1
Since a semi-fluid insulating material such as adhesive butyl rubber is used for the insulating compound 109 for preventing rainwater from entering the core wire 105b from the covering portion 105a of No. 05, once the discharge electrode device 106 is attached, its attachment position is changed. When the discharge electrode device 106 is removed by the above-mentioned circumstances, there is a problem that the removal work cannot be easily performed due to its high adhesiveness, and it becomes difficult to reuse the discharge electrode device 106 depending on the removing method.

Further, in the above-mentioned conventional discharge electrode device 106, when the discharge electrode device 106 is attached to the insulated wire 105, due to the difference in diameter of the insulated wire 105, the insulating compound 109, the insulated wire 105 and the insulating cover 10 are provided.
Since the degree of adhesion with 8 differs, it is necessary to prepare and work the discharge electrode device 106 of a type corresponding to the diameter of the insulated wire 105, which causes a problem of high cost and poor workability. It was

In the conventional discharge electrode device 106, the discharge portion 111b of the contact electrode portion 110 is the ground electrode 104.
Since it is difficult to perform the positioning (adjustment) to face the side, that is, to match the circumferential direction, the discharge electrode device 106 is inclined in the circumferential direction at the time of mounting, and the discharge part 111b of the contact electrode 110 is grounded. There is a problem in that the discharge start voltage does not become constant because it does not face the electrode 104 accurately.

In addition, since the insulating compound 109 is provided on the entire inner surface of the insulating cover 108 so as to be in close contact with the outer peripheral surface of the insulated wire 105, a large amount of insulating compound is required, and the cost is increased accordingly. There was a point.

[0008]

DISCLOSURE OF THE INVENTION The present invention is to solve the above-mentioned problems, and the first invention relates to the outer peripheral surface of an insulated electric wire (4) around which a bind wire (3) is wound. Insulation cover (2) to be attached by attaching the insulation cover (2)
A threaded hole (6d) is formed in the contact electrode part (13) screwed into the threaded hole (6d), and a tip part formed into a needle shape by tightening the screw of the contact electrode part (13). (14a) contacts the core wire (4b) of the insulated electric wire (4) (1)
The discharge electrode device for an insulated wire provided with 4) is characterized in that a groove (12) into which the bind wire (3) fits is provided on the inner surface (5c) of the insulating cover (2).

In a second aspect of the invention, when the needle electrode (14) is brought into contact with the core wire (4b) of the insulated wire (4) at the tip portion (14a) of the needle electrode (14), the insulated wire (4) The O-ring or the packing (16) is fitted between the covering portion (4a) and the upper surface (13b) of the contact electrode portion (13).

The third invention is based on the first or second invention.
In the insulating cover (2) of the invention of the invention, the spacer (1
7) (17 ') is separably provided, and the spacer (17)
Grooves into which the contact portions (17e) and (17e ') that come into contact with the outer circumference of the insulated electric wire (4) having the corresponding diameter and the bind wire (3) wound around the insulated electric wire (4) fit in the (17'). (17
f) (17f ') is formed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on the embodiments shown in FIGS.

1 is a discharge electrode device for an insulated wire of the present invention, and 2 is an EVA (ethylene vinyl alcohol) which is attached to an insulated wire 4 around which a bind wire 3 is wound so as to cover its outer peripheral surface and which has excellent weather resistance. -L) An insulating cover made of synthetic resin such as resin. The cover 2 is formed in a cylindrical shape and is divided into an upper cover 5 and a lower cover 6 in two parts. The upper and lower covers 5 and 6 are connected by a hinge 7 so as to be openable and closable. Further, the projection 2 having a square shape is formed on the piece 2b of the upper cover 5 on the side opposite to the hinge 7.
a is integrally formed toward the inside, and the projection 5a is formed on the piece 2b 'of the lower cover 6 opposite to the hinge 7.
Is formed integrally with each other, and when the upper and lower covers 5 and 6 are closed, the projection 5a fits into the hole 6a and the claw portion 5a 'formed on the projection 5a has a hole 6a. The upper and lower covers 5 and 6 are kept closed by being locked to the outer surface side of the.

Reference numeral 2c is a shield plate integrally formed on both ends of the upper and lower covers 5 and 6, which is formed of a bendable thin plate, and when the upper and lower covers 5 and 6 are closed and fixed to the insulated wire 4,
Cuts (slits) are formed so as to easily expand in accordance with the diameter of the insulated wire 4.

A mounting screw hole 5b is formed in the center of the piece 2b of the upper cover 5 on which the projection 5a is provided, and a piece 2b 'of the lower cover 6 in which the hole 6a is formed is formed. A mounting screw through hole 6b is formed, and when the upper and lower covers 5 and 6 are closed, the through hole 6b is formed.
Then, a mounting screw 9 made of synthetic resin such as EVA resin is inserted from the bottom surface 2d side of the insulating cover 2, and the screw portion is screwed into the mounting screw hole 5b so that the upper and lower covers 5 and 6 are not opened. There is. The mounting screw 9 is fitted in the mounting screw through hole 6b of the lower cover 6, and the tip portion 9a of the mounting screw 9 has an outer diameter of the mounting screw through hole as shown in FIGS. Stopper 1 having a doughnut-shape and a small wall thickness, which is larger than the diameter of 6b, and whose inner diameter is in close contact with the outer peripheral surface of the mounting screw 9.
0 is inserted and held so that the mounting screw 9 does not fall from the lower cover 6. The mounting screw 9 is formed of a soft synthetic resin such as nylon or vinyl or rubber so as not to cause a large friction when tightening the mounting screw 9.

A plurality of fan-shapes having arc-shaped electric wire contact portions 11a ', 11b', 11c 'which are concentric with the upper cover 5 and have a small radius are provided on both sides of the inner surface 5c of the upper cover 5 (embodiment). 3 ribs 11a, 11b, 11
c are juxtaposed and are integrally formed with the cover 5. When the upper and lower covers 5 and 6 are closed, the ribs 11a, 11b and 11c have an arc-shaped inner surface having a diameter of, for example, 19.5 mm (15 mm).
It is formed to have a diameter that contacts the outer circumference of the insulated wire 4 having a size of 0 sq).

End faces 11 of the three ribs 11a, 11b, 11c on the side where the bind wire 3 of the insulated wire 4 passes.
As shown in FIG. 2, a ″, 11b ″, and 11c ″ are notched along the inclination (the inclination with respect to the axis of the cover 2) through which the binding line 3 passes, that is, as shown in FIG. In addition, the length in the circumferential direction is gradually reduced from the outer rib 11c to the inner rib 11a.

Also, such ribs 11a, 11b, 1
As shown in FIG. 2, 1c is provided point-symmetrically on the inner surfaces of both ends of the upper cover 5 with the center of the upper cover 5 as the center.

The ribs 11a, 11 on both sides are
As shown in FIG. 2, end faces 11a ″, 11b ″, and 11c ″ of b and 11c form a groove 12 into which the bind wire 3 wound around the insulated wire 4 is fitted, and the insulating cover 2 serves as the insulated wire 4 When the binding wire 3 is fitted into the groove 12 when it is attached to the end surface 11 of the binding wire 3.
The insulating cover 2 is positioned in the circumferential direction with respect to the insulated wire 4 by hitting a ", 11b", and 11c ", so that the discharging portion 15 of the contact electrode portion 13 described later accurately faces the ground electrode 24.

Further, both ribs 11 formed on both sides of the above
An inner surface portion of the upper cover 5 between a and 11a is a space for mounting, and this portion constitutes a mounting portion 5f of the spacer 17 described later. The mounting portion 5f is formed with a mounting hole 5e penetrating the inner surface 5c and the outer surface 5d of the upper cover 5.

At the center of the bottom portion of the lower cover 6, there is formed a convex portion 6e which is formed by penetrating a screw hole 6d for screwing a contact electrode portion 13 which will be described later inward and outward. Furthermore,
An insulating cover 2 is provided on both ends 6f of the bottom surface 6c to insulate the electric wire 4.
A through hole 6g for inserting a tool (not shown) when it is mounted on is formed. In addition, after the insulating cover 2 is attached to the insulated wire 4, the through hole 6g is
It is used as a drainage hole for discharging rainwater and the like that have entered the insulating cover 2.

Reference numeral 13 is a contact electrode portion, and as shown in FIG. 5, a needle electrode 14 made of metal such as stainless steel or brass.
And covering the outer peripheral surface of the needle electrode 14 excluding the tip portion 14a, forming a discharge hole 13f, engraving a male screw 13a on the side surface, and further integrally forming a hexagonal nut portion 13c on the lower portion. The screw portion 13d is made of synthetic resin. Then, the male screw portion 13a formed on the outer peripheral surface of the contact electrode portion 13 is tightened from below into the screw hole 6d formed in the convex portion 6e of the lower cover 6 to provide a state as shown in FIG. .

The bottom surface 14b of the discharge hole 13f faces the ground electrode 24 when the insulating cover 2 is attached to the insulated wire 4 and discharges an abnormal voltage generated in the insulated wire 4 to the ground electrode 24. It is the discharge unit 15.

Reference numeral 16 denotes an O-ring having a shape as shown in FIG. 6, which is formed of an insulating member such as rubber or soft synthetic resin. As shown in FIG. 9, the tip portion 14a of the needle electrode 14 is formed.
It is inserted into and is fixedly held by an adhesive material or an adhesive agent if necessary.

Although the O-ring 16 is illustrated in this embodiment, the insulated wire 4 is used instead of the O-ring 16.
You may use the packing which made the covering part 4a and the upper surface 13b of the contact electrode part 13 closely contact. In order to further improve the waterproofness of the O-ring 16 or the packing, the O-ring 16 or the hole of the packing or the needle electrode 14
If a sealing agent such as grease is applied to the tip portion 14a of the above in advance, the waterproofness can be further improved.

Numerals 17 and 17 'are spacers, which are made of the same synthetic resin as the insulating cover 2 such as EVA resin, the outer peripheral shape of which is formed so as to be separably mounted on the spacer mounting portion 5f of the upper cover 5. ing. 7 shows the spacer 17 applied to the insulated wire 4 having a diameter of 14.5 mm (60 sq), and FIG. 8 shows the insulated wire 4 having a diameter of 9 mm.
The spacer 17 'applied to the above is shown.

On the upper surface 17a side of the spacer 17, a mounting portion 17b consisting of a mounting projection penetrating the mounting hole 5e of the spacer mounting portion 5f of the upper cover 5 is provided, and the lower surface 17
On the d side, three ribs 17g whose inner surfaces are arcuate contact portions 17e are integrally formed in parallel. The contact portion 17
The inner diameter of e is set to be substantially equal to the diameter of the corresponding insulated wire 4. Therefore, by attaching the spacer 17 to the spacer attaching portion 5f, the wire contact portions 11a ', 11b', 1 in the ribs on the upper cover 5 side can be obtained.
The electric wire contact portion 17e having a diameter smaller than that of 1c 'can be formed.

Further, the insulated wire 4 is attached to each rib 17g.
A groove 17f into which the bind wire 3 wound around is fitted is formed. When the insulating cover 2 is fitted onto the insulated wire 4, the groove 17f is inclined with respect to the axial direction of the insulating cover 2. It is formed to be inclined along the passing direction.

In the spacer 17 'shown in FIG. 8, the electric wire contact portion 17e' is formed by an inclined surface which passes through a radius portion smaller than the radius of the spacer 17 electric wire contact portion 17e, and is further further than the insulated electric wire corresponding to the spacer 17. The wire contact portion 17e 'comes into contact with the outer periphery of the small-diameter insulated wire.
Since the other structure of the spacer 17 'is similar to that of the spacer 17, the same parts are denoted by the same reference numerals and the description thereof is omitted.

Therefore, the insulated wire 4 has a large diameter (19.5).
mm), the spacer is not used as shown in FIG. 11. When the insulated wire 4 has a medium diameter (14.5 mm), the spacer 17 is used as shown in FIG. 12 and the insulated wire 4 has a small diameter (9 mm).
In this case, the spacer 17 'is used.

Here, in the present embodiment, the spacers 17 and 17 'when the diameter of the insulated wire 4 is 14.5 mm and 9 mm are described, but the contact portions 17e and 17e' of the spacers 17 and 17 'are described. By using the spacer whose height is changed according to the diameter of the insulated wire 4, the discharge electrode device for insulated wire 1 can be attached to the insulated wire 4 having a diameter other than the above.

Next, the case where the discharge electrode device for insulated wire 1 of the present invention is attached to the insulated wire 4 will be described with reference to FIGS. 9 to 11. In this case, the spacers 17 and 17 'are not used.

With the upper and lower covers 5 and 6 in the insulated wire discharge electrode device 1 opened as shown in FIG. 9, a through hole 6g provided on the bottom surface 2d side of the insulating cover 2 is formed.
Insert a tool (not shown) from the
At a position where the bind wire 3 wound around the insulated electric wire 4 is located above the insulated electric wire 4, the lower cover 6 is pressed against the insulated electric wire 4 from below, and then the upper cover 5 is closed to project the protrusion of the upper cover 5. Fit 5a into the hole 6a of the lower cover 6,
Further, the mounting screw 9 fitted into the mounting screw through hole 6b of the lower cover 6 is screwed into the mounting screw hole 5b of the upper cover 5 and tightened to fix the insulating cover 2 to the insulated wire 4. Then remove the tool (not shown). At this time, the discharge portion 15 of the contact electrode portion 13 provided on the bottom surface 2d side accurately faces the ground electrode 24.

That is, by fitting the groove 12 formed in the upper case 5 to the bind wire 3 that passes above the insulated wire 4, this serves as positioning and the discharge portion 15 faces downward on the vertical line. Since the bind wire is generally wound around the insulated wire 4 at a constant pitch, the ground electrode 24 is set at a position where the bind wire 3 passes above the insulated wire 4 as shown in FIG. The discharge part 15 is accurately opposed to the ground electrode 24.

Next, as shown in FIG. 11, the contact electrode portion 1
3 is tightened and moved upward, and the tip portion 14a of the needle electrode 14 provided at the tip thereof breaks the covering portion 4a of the insulated wire 4 and contacts the core wire 4b. At this time, the tip portion 1 of the needle electrode 14
The O-ring 16 fitted in 4a is in close contact with the broken covering portion 4a of the insulated wire 4 and the upper surface 13b of the contact electrode portion 13 to prevent the exposed portion of the charging portion such as the needle electrode 14 from being exposed. In addition, the core wire 4b of the insulated electric wire 4 and the stress corrosion of the needle electrode 14 are prevented by preventing the rainwater or the like from penetrating the core wire 4 from the covered portion 4a of the insulated electric wire 4.

When the diameter of the insulated wire 4 is different, as shown in FIG. 13 (here, the diameter of the insulated wire 4 is 9 mm), the above spacer 17 'is attached to the spacer mounting portion of the upper cover 5. 5e, after attaching the insulating cover 2,
It is attached to the insulated wire 4 in the same manner as when the spacer 17 is not attached. As a result, the insulated electric wire 4 having a small diameter can be easily attached. This spacer 1
FIG. 13 shows the state when 7'is used. FIG. 12 shows a state in which the spacer 17 is used.

Next, the usage state of the insulated wire discharge electrode device 1 of the present invention will be described with reference to FIG. Reference numeral 20 denotes an insulator protection device, which has a general-purpose support insulator 22 attached and fixed to a wire pole 21 of a utility pole of a high-voltage power distribution line, and an insulated electric wire 4 is tightly bound by a bind wire 3 to a grip portion 23 of its head. There is. The insulated wire discharge electrode device 1 for insulated wire is attached to the insulated wire 4 as described above, and the discharge portion 15 provided on the bottom surface 2d side thereof is connected to the ground electrode 24 via the gap G.
Facing.

Further, a mounting metal fitting 25 is provided on the ground-side arm 21 and the mounting metal fitting 25 is mainly composed of the ground electrode 24 and zinc oxide (ZnO) which is excellent in voltage non-linearity inside. A current limiting element unit 27 having a current limiting element 26 is electrically connected and attached. Furthermore, mounting bracket 2
5 is electrically connected to arm 21 and arm 2
A detent metal fitting 28 is formed to prevent rotation with respect to 1.

In the insulator protection device 20 having the above structure, when the lightning surge propagates through the insulated wire 4 and the voltage is equal to or higher than the discharge start voltage of the protection device 20, the overvoltage is applied between the discharge gaps G, A flashover occurs in the gap G.
When there is a flash, the lightning surge is insulated wire 4-contact electrode section 13-
Discharge gear G-ground electrode 24-current limiting element unit 27
-Mounting fixture 25-Discharge to the ground through the discharge path of the arm 21. At this time, since the discharge gap G and the current limiting element unit 27 are present in the discharge path, the follow current arc is cut off and does not occur. Therefore, the support insulator 22 is prevented from being unbalancedly broken by the arc, and the insulated wire 4 is prevented from being broken due to its melting loss.

FIG. 15 and FIG. 16 show a temporary holding structure when the mounting bracket 25 is mounted on the arm 21. In FIG. 15, reference numeral 25 denotes the above-mentioned mounting metal fitting, and a mounting hole 25a through which the mounting bolt 30 is inserted is formed in the base portion thereof. 31
Is a thin plate-like fall prevention plate, in which a locking hole 32 is formed. The locking hole 32 has the mounting hole 25 on the inner periphery thereof.
Three locking pieces 33 having an inner diameter smaller than the inner diameter of a and slightly larger than the thread of the mounting bolt 30 are formed so as to project in the circumferential direction. Then, the fall prevention plate 31
16 has its locking hole 32 aligned with the mounting hole 25a and abuts the lower surface of the mounting member 25, and is fixed to the mounting member 25 by a blind rivet 34 as shown in FIG.

When the mounting member 25 is attached to the arm member 21, the mounting member 25 is attached to the fall prevention plate 3 without the nut 40 and the washer 41 shown in FIG.
1 through the locking hole 32 and the mounting hole 25a
Insert 0 from below. In this inserted state, when the operator's hand is released from the mounting bracket 25 equipped with the current limiting element unit 27, the mounting bracket 25 inclines so that the right side of FIG. As a result, the locking piece 33 is locked in the thread groove of the mounting bolt 30, and the mounting bracket 25 is temporarily held in a slightly inclined state without dropping.

Thereafter, the washer 41 is inserted into the mounting bolt 30 and the nut 40 is screwed to fix the mounting bracket 25. Since the mounting bracket 25 is temporarily held as described above, the mounting work is facilitated.

[0042]

Since the present invention has the above-described structure and the O-ring or packing is provided at the tip of the needle electrode, the O-ring or packing covers the insulated wire only by tightening the contact electrode portion against the insulating cover. Since the portion and the upper surface of the contact electrode portion are in close contact with each other, the needle electrode (charging portion) can be easily insulated.

Further, since the O-ring or packing of the insulating member which is in intimate contact with the covering portion of the insulated wire and the upper surface of the contact electrode portion is provided, even when rainwater enters the insulating cover, the needle electrode ( Rainwater does not intrude through the covered portion of the insulated electric wire where the charging portion) and the needle electrode pierce, and stress corrosion of the core wire and needle electrode of the electric wire can be prevented.

Further, since the O-ring or packing is fitted to the tip of the needle electrode, it is possible to prevent the O-ring or packing from dropping and being lost during work. Further, as compared with the conventional insulating compound, the present invention uses the O-ring or the packing as described above, so that the structure is simple and the cost can be reduced.

Further, since the groove for fitting the bind wire is formed on the inner surface of the insulating cover or the spacer, the discharge electrode device only needs to be fitted with the bind wire in the groove of the insulating cover or the spacer to discharge the contact electrode portion of the discharge electrode device. Since the portion can be provided at a position that exactly faces the ground electrode, workability is improved.

By mounting a spacer between the insulating cover and the insulated wire so as to be separable in correspondence with the diameter of the same wire, the above effect can be exhibited and the insulating cover can be shared even for insulated wires having different diameters. The cost can be reduced.

Further, since the conventional adhesive insulating compound is not used, the replacement work of the discharge electrode device becomes easy.

[Brief description of drawings]

FIG. 1 is a perspective view of a discharge electrode device for an insulated wire according to the present invention with an insulating cover opened.

FIG. 2 is a plan view of the discharge electrode device for an insulated wire according to the present invention with an insulating cover opened.

FIG. 3 is a side view of the insulated wire discharge electrode device of the present invention with an insulating cover open.

FIG. 4 is a perspective view of a stopper.

FIG. 5 is a sectional view of a contact electrode portion.

FIG. 6 is a perspective view of an O-ring.

FIG. 7 shows a spacer used when the diameter of the insulated wire is 14.5 mm, (a) is a plan view, (b) is a side view, and (c) is a bottom view.

FIG. 8 shows a spacer used when the diameter of the insulated wire is 9 mm, (a) is a plan view, (b) is a side view,
(C) is a bottom view.

FIG. 9 is a sectional view on the verge of attaching the discharge electrode device for an insulated wire of the present invention to the insulated wire.

FIG. 10 is a perspective view showing a state where a spacer is being attached to the upper cover.

FIG. 11 is an end view showing a state where the insulated wire discharge electrode device of the present invention is attached to an insulated wire.

FIG. 12 is a cross-sectional view showing a state in which the insulated wire discharge electrode device of the present invention is attached to an insulated wire having a diameter of 14.5 mm via a spacer.

FIG. 13 is a cross-sectional view of a state in which the insulated wire discharge electrode device of the present invention is attached to an insulated wire having a diameter of 9 mm via a spacer.

FIG. 14 is a view showing a usage state of the insulated wire discharge electrode device of the present invention.

FIG. 15 is a perspective view in which a mounting bracket and its fall prevention plate are separated.

FIG. 16 is a perspective view in which a fall prevention plate is attached to the attachment fitting.

FIG. 17 is a side view of an insulator protection device using a conventional discharge electrode device.

FIG. 18 is a cross-sectional view of a conventional discharge electrode device.

[Explanation of symbols]

 1 Discharge Electrode Device for Insulated Wire 2 Insulation Cover 3 Bind Wire 4 Insulated Wire 4a Covering Part 4b Core Wire 5 Upper Cover 6 Lower Cover 6d Screw Holes 11a, 11b, 11c Rib 12 Groove 13 Contact Electrode 13b Top 14 Needle Electrode 14a Tip 15 Discharge part 16 O-ring 17, 17 'Spacer 17e, 17e' Spacer contact part 17f, 17f 'Groove for fitting bind wire

Claims (3)

[Claims] 1. An insulating cover (2) to be attached to an outer peripheral surface of an insulated electric wire (4) wound with a bind wire (3),
A needle is formed by screwing the contact electrode portion (13) screwed into the screw hole (6d) by forming a screw hole (6d) in the insulating cover (2). A discharge electrode device for an insulated wire, comprising: a needle electrode (14) whose tip portion (14a) formed into a shape contacts the core wire (4b) of the insulated wire (4), the inner surface (5c) of the insulating cover (2). A discharge electrode device for an insulated wire, comprising a groove (12) into which the bind wire (3) fits. 2. The insulated electric wire (4) when the needle electrode (14) of the needle electrode (14) according to claim 1 is brought into contact with the core wire (4b) of the insulated electric wire (4). A discharge electrode device for an insulated wire, characterized in that an O-ring or a packing (16) which is in close contact is fitted between the covering portion (4a) of (1) and the upper surface (13b) of the contact electrode portion (13). 3. The insulating cover (2) according to claim 1 or 2.
Inside, spacers (17) and (17 ') are separably provided,
The spacers (17) and (17 ') have contact portions (17e) and (17) which come into contact with the outer circumference of the insulated electric wire (4) having a corresponding diameter.
A discharge electrode device for an insulated wire, characterized in that grooves (17f) and (17f ') into which the binding wire (3) wound around the insulated wire (4) is fitted.