JPH1187013A - Discharge electrode device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent removal or missing of an O-ring at the time of transportation and fitting by forming one of an O-ring and a contact electrode with a fitting projecting part, and forming the other thereof with a fitting recessed part, and fitting them to each other. SOLUTION: An O-ring 27 is made of an insulating material having elasticity such as chloroprene, and formed with a through hole passing through a tip 24a of a needle electrode 24, and in a top surface side of the O-ring 27, the tip 24a of the needle electrode 24 breaks a coating part 29a of an insulated wire 29 so as to contact with a core 29b and adhere to the insulated wire 29. Furthermore, an annular wall is integrally formed under the O-ring, and an annular fitting projecting part 27b having a projecting cross section, which can be fitted in a fitting recessed part 25 provided in a tip of a contact electrode 23, is provided under the annular wall. The fitting projecting part 27 is fitted in the fitting recessed part 26 by pushing the O-ring 27 to the contact electrode 23, and the O-ring 27 is connected by the elastic restoring force of the fitting projecting part 27b.

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 an insulated electric wire of a high-voltage distribution line is bound to a gripping portion of a head of a support insulator by a bind wire to support the wire, and is provided near the support insulator. The present invention relates to an improvement in a discharge electrode device of the insulator protection device.

[0002]

2. Description of the Related Art Conventionally, in a high-voltage distribution line using insulated wires, an insulator protection device 100 is provided near a supporting insulator 101 as shown in FIG. Generally, the insulator protection device 100 includes a current limiting element unit 103 and a ground electrode 10 attached to a mounting bracket 102 mounted on the bottom side of a support insulator 101.
4 and the discharge electrode device 106 is provided on the insulated wire 105. An abnormal voltage such as a lightning surge propagating through the distribution line is discharged from the discharge electrode device 106 to the ground electrode 104, and Support insulator 10 by flowing to the ground
1 is protected. During this discharge,
By the current limiting element unit 103 interposed in the discharge path, the secondary flow of the commercial frequency is blocked.

As shown in FIG. 23, the discharge electrode device 106 is provided with an insulating cover 109 provided on an insulated wire 105 with an inner surface provided with a groove for guiding a bind wire 108 wound around the insulated wire 105. An O-ring 11 is provided around the contact electrode portion 110 attached to the
The tip 111a of the needle electrode 111 provided with the wire 2 pierces the covering portion 105a of the insulated wire 105 and comes into contact with the core wire 105b, and the O-ring 112 is interposed between the insulated wire 105 and the contact electrode portion 110 so that the two are connected. They are closely attached.

[0004]

However, since the O-ring 112 provided around the needle electrode on the upper surface of the contact electrode in the above-mentioned conventional discharge electrode device 106 is fixed with an adhesive, the discharge electrode is transported. When the O-ring 112 is detached or lost at the time of attachment or attachment, the discharge electrode device 106 is mounted without the O-ring attached, which causes rattling of the discharge electrode device 106 and lowering of water tightness of the needle electrode portion. was there.

[0005] Further, the above-mentioned conventional discharge electrode device 106 has poor adhesion to the insulated wire 105 when or after it is attached to the insulated wire 105, so that the discharge electrode device 106 is not used.
In some cases, a single-cell sponge is provided on the inner surface side of the discharge electrode device 106 in order to enhance the adhesion, because the back-and-forth is loose or displaced. It is difficult to install when attaching to, or a single foam sponge falls,
There was a problem that the cost would be high.

[0006]

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and a first invention is directed to an outer peripheral surface of an insulated wire (29) around which a bind wire (30) is wound. An insulating cover (2) to be mounted, and a screw hole (4f) formed in the insulating cover (2) to form the screw hole (4f).
A contact electrode portion (23) screwed to the contact electrode portion (2);
The tip (2) formed into a needle shape by tightening the screw of 3)
4a) is brought into contact with the core wire (29b) of the insulated wire (29), and the tip (24) of the needle electrode (24).
When the a) is brought into contact with the core wire (29b) of the insulated wire (29), the O-ring (27) is in tight contact between the covering portion (29a) of the insulated wire (29) and the upper surface of the contact electrode portion (23). )
The O-ring (27).
And one of the contact electrode portions (23) is formed with a fitting protrusion and the other is formed with a fitting recess, and an O-ring is provided by fitting the fitting protrusion and the fitting recess. It is a feature.

In the present invention, by fitting the fitting projection (27b) into the fitting recess (25), the fitting state is strengthened by the elastic force of the O-ring (27), and the discharge electrode device is formed. The O-ring can be reliably prevented from being detached or lost during transportation or installation of the O-ring.

According to a second aspect of the present invention, there is provided an insulating cover (2) mounted on an outer peripheral surface of an insulated wire (29) around which a bind wire (30) is wound, and a screw hole (4f) in the insulating cover (2).
And a contact electrode portion (2) screwed into the screw hole (4f).
3) a needle electrode (24) for tightening a screw of the contact electrode portion (23) to bring a needle-shaped tip (24a) into contact with a core wire (29b) of the insulated wire (29); When the tip (24a) of the electrode (24) is brought into contact with the core wire (29b) of the insulated wire (29), the contact between the coating (29a) of the insulated wire (29) and the upper surface of the contact electrode portion (23). A discharge electrode device provided with an O-ring (27) which is in close contact therewith, characterized in that a flexible crease (14) is provided in the insulating cover (2) so as to be in close contact with the insulated wire (29). It is intended to provide a discharge electrode device which performs the following.

In the present invention, by attaching the discharge electrode device (1) to the insulated wire (29), the folds (14) having flexibility adhere to the outer peripheral surface of the insulated wire (29).

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the embodiments shown in FIGS.

Reference numeral 1 denotes a discharge electrode device according to the present invention. Reference numeral 2 denotes an insulating cover made of a synthetic resin such as EVA (ethylene vinyl alcohol) resin having excellent weather resistance and attached to the insulated wire 29 around which the bind wire 30 is wound so as to cover the outer peripheral surface thereof. The cover 2 is formed in a cylindrical shape, and is formed by an upper cover 3 and a lower cover 4.
The upper and lower covers 3, 4 are connected by a hinge 5 so as to be openable and closable. Further, as shown in FIGS. 3 and 4, a horn-shaped projection 6 is integrally formed on a piece 3a of the upper cover 3 opposite to the hinge 5 toward the inside. In the opposite side 4a, a square fitting hole 7 into which the protrusion 6 is fitted is integrally formed, and when the upper and lower covers 3, 4 are closed,
The projection 6 is fitted into the fitting hole 7, and the claw portion 6 a formed on the projection 6 is locked on the outer surface of the fitting hole 7, so that the upper and lower covers 3, 4
Is kept closed.

Reference numeral 8 denotes a closing plate integrally formed on both ends of the upper and lower covers 3 and 4 and is formed of a bendable thin plate. When the upper and lower covers 3 and 4 are closed and fixed to the insulated wire 29,
Cut 9 so as to easily spread according to the diameter of insulated wire 29
(Slits) are formed. Also, upper and lower covers 3,
4 are provided at both ends with wire through holes 10 penetrating the insulated wire 29, formed on the upper cover 3 side to have a small diameter according to the diameter (for example, 9 mm) of the small-diameter insulated wire 29, and provided on the lower cover 4 side. The diameter of the large-diameter insulated wire 29 (for example, 19.5 m
m) to have a large diameter. Further, on both sides of both ends of the upper and lower covers 3 and 4, there are formed bind wire through holes 11 penetrating the bind wires 30. By passing the bind wires 30 through the holes 11, the shielding plate 8 is insulated. 29.

A mounting screw hole 3b is formed at the center of the piece 3a of the upper cover 3 where the projection 6 is provided, and a mounting screw hole 3b is formed at the center of the piece 4a of the lower cover 4 where the fitting hole 7 is formed. Is formed with a mounting screw through hole 4b. When the upper and lower covers 3 and 4 are closed, the mounting screw 12 made of synthetic resin such as EVA resin is inserted into the mounting screw through hole 4b from the bottom surface 2a side of the insulating cover 2. The upper and lower covers 3, 4 are not opened by screwing the screw portion to the mounting screw hole 3b. The mounting screw 12 is fitted in the mounting screw through hole 4b of the lower cover 4, and when the insulating cover 2 is open, the mounting screw 12 has an outer diameter as shown in FIG. 4b, a doughnut-shaped and thin-walled stopper 13 whose inner diameter is in close contact with the outer peripheral surface of the mounting screw 12 is fitted therein.
The mounting screw 12 is held so as not to drop from the lower cover 4. The mounting screw 12 is formed of a soft synthetic resin such as nylon or vinyl, rubber, or the like so as not to generate a large friction when tightening the mounting screw.

On the inner surface 3c of the upper cover 3 and on both sides, a plurality of, in this embodiment four, ribs 15, 16, 1 are provided.
7 and 18 are integrally formed, and are formed in a fan shape as shown in FIGS. 5 and 6 when viewed from the axial direction of the cover 3. Further, these ribs 15 to 18 are provided with flexible, thin folds 14 which are located at the central portions of the respective upper surfaces and are integrally provided with the ribs. Further, the inner diameter of each of the ribs 15 to 18 is shown in FIG.
As shown in the figure, the outer diameter of the insulated wire 29 is formed larger than the outer diameter,
The inner diameter of each fold 14 is formed to be smaller than the outer diameter of the insulated wire 29, so that each fold 14 comes into close contact with the insulated wire 29 as shown in FIG. .

As shown in FIG. 3, the four ribs 15,
Bind wire 3 of insulated wire 29 at 16, 17, 18
End surfaces 15a, 16a, 17a, 18a on the side through which 0 passes
Are cut off along the inclination through which the binding line 30 passes (inclined with respect to the axis of the cover 2), that is, the circumferential length of the outer ribs 15, 18 from the inner ribs 16, 17 sequentially increases. It is getting shorter. In addition, such ribs are provided on the inner surfaces of both ends of the upper cover 3 symmetrically with respect to the center of the upper cover 3.

Then, the ribs 15, 16, 1 on both sides are formed.
A groove 19 for fitting the binding wire 30 wound around the insulated wire 29 is formed by the end surfaces 15 a, 16 a, 17 a 18 a of 7 and 18, and is bound to the groove 19 when the insulating cover 2 is attached to the insulated wire 29. Line 3
By inserting 0, the bind wire 30 is moved to the ribs 15, 16,
The insulating cover 2 is positioned in the circumferential direction with respect to the insulated wire 29 by contacting the end surfaces 15 a, 16 a, 17 a, 18 a of 17, 18, so that the discharge portion 26 of the contact electrode portion 23, which will be described later, accurately faces the ground electrode 31. ing.

Further, the ribs 16, 1 formed on the both side portions are provided.
The inner surface of the upper cover 3 between the spacers 7 is a spacer 2 to be described later.
A spacer mounting portion 20 for mounting 8, 28 'is formed. The mounting portion 20 is formed with a spacer mounting hole 21 penetrating from the inner surface 3c of the upper cover 3 to the outer surface thereof.
When a spacer 28, 28 'described later is mounted, the mounting projection 28b of the spacer is fitted.

A screw hole 4f is formed in the center of the bottom of the lower cover 4 for screwing a contact electrode 23 described later in and out. Further, a tool insertion groove 22 for inserting a tool (not shown) when the insulating cover 2 is attached to the insulated wire 29 is provided at both end sides of the bottom surface 4d.
Are formed. In addition, after the insulating cover 2 is attached to the insulated wire 29, the tool inserting groove 22 is
It is used as a drain hole for discharging rainwater and the like that has entered the inside.

Reference numeral 23 denotes a contact electrode portion, as shown in FIG. 8, a needle electrode 24 made of a metal such as stainless steel or brass.
And a discharge hole 23a formed on the outer peripheral surface of the needle electrode 24 excluding the tip portion 24a, a male screw is formed on a side surface, and a hexagonal nut portion is integrally formed on a lower portion. An annular fitting recess 25 having a concave cross section for fitting an O-ring 27 described later is formed at the tip of the threaded portion 23b. Then, a male screw portion formed on the outer peripheral surface of the contact electrode portion 23 is screwed into the screw hole 4f of the convex portion 4e of the lower cover 4 from below and tightened to prepare for a state as shown in FIG.

The lower end opening of the discharge hole 23a faces the ground electrode 31 when the insulating cover 2 is attached to the insulated wire 29 as shown in FIG. Discharge unit 2 for discharging to 31
It is 6.

Reference numeral 27 denotes an O-ring having a longitudinal sectional shape as shown in FIG. 10, which is formed of an insulating material such as rubber such as chloroprene rubber or a soft synthetic resin and an elastic material. There is a through hole 27a through which the tip 24a of the electrode 24 penetrates.
Is brought into close contact with the insulated wire 29 when it breaks the covering portion 29a of the insulated wire 29 and comes into contact with the core wire. Further, an annular wall 27c is integrally formed below the annular wall 27c.
On the lower surface side, there is provided an annular fitting convex portion 27b having a convex cross section that can be fitted into the fitting concave portion 25 provided at the tip of the contact electrode portion 23. Then, by pressing the O-ring 27 against the contact electrode portion 23, the fitting convex portion 27b is opened and then fitted into the fitting concave portion 25, and the O-ring 27 is pressed by the elastic restoring force of the fitting convex portion 27b. It is designed to be connected. Further, if a sealing agent such as grease is applied in advance to the inside of the hole of the contact electrode portion 23 or the tip portion 24a of the needle electrode 24, the waterproof property between the insulating wire 29 and the insulated wire 29 can be improved. The O-ring 27
And the fitting protrusion may be provided on the contact electrode portion 23 side.

FIGS. 13 and 18 show two types of spacers 28,
28 ', which are the same EV as the insulating cover 2.
It is formed of a synthetic resin such as resin A, and its outer peripheral shape is formed so that it can be detachably mounted on the spacer mounting portion 20 of the upper cover 3. The spacer 28 shown in FIG.
A spacer 28 'shown in FIG. 18 is applied to the case where the diameter of the insulated wire 29 is 14.5 mm (60 sq).
Indicates that the diameter of the insulated wire 29 is 9 mm.

First, the spacer 2 applied to the insulated wire 29 shown in FIG. 13 having a diameter of 14.5 mm (60 sq) is used.
8 will be described. On the upper surface 28a side of the spacer 28, there is provided a mounting projection 28b penetrating through the spacer mounting hole 21 of the spacer mounting portion 20 of the upper cover 3, and a lower surface 28c
On the side, there are four ribs 28d having a circular cross section.
Are formed almost in parallel. The diameter between the two ribs 28d facing each other in the direction orthogonal to the axis is set slightly larger than the diameter of the corresponding insulated wire (diameter: 14.5 mm (60 sq)) 29. Further, between the adjacent ribs, there are provided flexible folds 28e which are in contact with and in close contact with the insulated wires 29, respectively. The opposing folds 28e, 2
The interval between 8e is set smaller than the diameter of the corresponding insulated wire. Therefore, this spacer 28 is
By attaching to the above-mentioned spacer attaching portion 20 as shown in FIG. 15, as shown in FIG.
The ribs 15, 16, 17, 18 can be attached to the insulated wire 29 having a diameter of 14.5 mm, which is smaller than the diameter of the ribs 15, 16, 17, 18, and the folds 28 e can be brought into close contact with the insulated wire 29.

Further, between the opposed ribs 28d,
Groove 2 into which bind wire 30 wound around insulated wire 29 fits
When the insulating cover 2 is fitted to the insulated wire 29, the insulating cover is positioned in the groove 28f in the same manner as the groove 19 provided in the upper cover 3.

The spacer 28 'shown in FIG. 18 is provided with six ribs 28d' substantially in parallel, and the groove 28 through which the bind wire 30 passes in a direction slightly inclined with respect to the longitudinal direction of the insulated wire 29.
f 'is formed, and a fold 28e' is provided between the ribs 28d 'so as to be in close contact with the insulated wire 29. Since the other structure of the spacer 28 'is the same as that of the spacer 28, the same portions are denoted by the same reference numerals with dashes, and description thereof will be omitted.

Therefore, the insulated wire 29 has a large diameter (19.
5 mm), a spacer is not used. When the insulated wire 29 has a medium diameter (14.5 mm), a spacer 28 is used as shown in FIGS.
In the case of m), a spacer 28 'is used as shown in FIG.

Here, in the embodiment of the present invention, the spacers 28 and 28 'when the diameter of the insulated wire 29 is 14.5 mm and 9 mm.
However, by using a spacer in which the height of the spacers 28, 28 'is changed in accordance with the diameter of the insulated wire 29, the discharge electrode device 1 can be used for the insulated wire 29 having a diameter other than the above. Can be attached.

Next, a case where the discharge electrode device 1 of the present invention is attached to the insulated wire 29 will be described. In this case, the spacers 28 and 28 'are not used.

When the upper and lower covers 3 and 4 of the discharge electrode device 1 are opened as shown in FIG. 3, a tool (not shown) is inserted through a tool insertion groove 22 provided on the bottom surface 4d of the insulating cover 2. At a position where the bind wire 30 inserted and wound around the insulated wire 29 is located above the insulated wire 29, the lower cover 4 is pressed against the insulated wire 29 from below, and then the upper cover 3 is closed. The protrusion 6 of the upper cover 3 is fitted into the fitting hole 7 of the lower cover 4, and the mounting screw 12 inserted into the mounting screw through hole 4 b of the lower cover 4 is screwed into the mounting screw hole 3 b of the upper cover 3. Then, the insulating cover 2 is fixed to the insulated wire 29. Then, a tool (not shown) is removed. At this time, the discharge part 26 of the contact electrode part 23 provided on the side of the bottom surface 4 d accurately faces the ground electrode 31.

That is, by fitting the groove 19 formed in the upper cover 3 into the bind wire 30 passing above the insulated wire 29, this is positioned and the discharge portion 2
6 is downward on the vertical line. Since the bind wire 30 is generally wound around the insulated wire 29 at a constant pitch, as shown in FIG.
The ground electrode 31 shown in FIG.
Is positioned so that the discharge portion 26 accurately faces the ground electrode 31.

Next, the contact electrode portion 23 is tightened and moved upward, and the tip end portion 24a of the needle electrode 24 provided at the tip end is tightened.
To break the covering portion 29a of the insulated wire 29 and contact the core wire 29b. At this time, the O fitted to the tip of the contact electrode portion 23
The ring 27 is in close contact between the broken covering portion 29a of the insulated wire 29 and the upper surface of the contact electrode portion 23 to prevent the charged portion such as the needle electrode 24 from being exposed, and to break through rainwater or the like. Stress corrosion of the core wire 29b of the insulated wire 29 and the needle electrode 24 is prevented by preventing the core wire 29b from penetrating from the covering portion 29a of the insulated wire 29.

When the diameters of the insulated wires 29 are different, the above-mentioned spacers 28 and 28 'are mounted on the spacer mounting portion 20 of the upper cover 3, and then the insulating cover 2 is mounted and the above-mentioned spacers 28 and 28' are mounted. It is attached to the insulated wire 29 in the same manner as when it is not performed. Thereby, it can be easily attached to the insulated wire 29 having a small diameter.

Next, the use state of the discharge electrode device 1 of the present invention will be described with reference to FIG. Reference numeral 32 denotes an insulator device, which includes a general support insulator 34 attached to and fixed to an arm 33 of a power pole of a high-voltage distribution line, and an insulated wire 29 is bound by a bind wire 30 to a grip portion 34a at the head thereof. .
The above-described discharge electrode device 1 is attached to the insulated wire 29 as described above, and the discharge portion 26 provided on the bottom surface thereof faces the ground electrode 31 via the gap G.

A mounting bracket 35 is attached to the arm 33 on the ground side.
A current limiting element unit 36 including a ground electrode 31 and a current limiting element 36a mainly composed of zinc oxide (ZnO) having excellent voltage non-linearity is provided in the mounting bracket 35.
Are electrically connected and mounted. Further, the mounting bracket 35 is electrically connected to the arm bar 33 and is formed with a rotation preventing bracket 37 for preventing rotation with respect to the arm bar 33.

In the insulator protection device 32 having the above-described structure, the lightning surge propagates through the insulated wire 29 and the voltage of the lightning surge is reduced.
If the discharge voltage is equal to or higher than the discharge start voltage, the overvoltage is applied between the discharge gaps G, and flashover occurs in the gap G. Upon flashing, the lightning surge is discharged to the ground through a discharge path of the insulated wire 29, the contact electrode part 23, the discharge gap G, the ground electrode 31, the current limiting element unit 36, the mounting bracket 35, and the arm 33. Further, at this time, since the discharge path includes the discharge gap G and the current limiting element unit 36, the following arc is interrupted and does not occur. Therefore, the support insulator 34 is prevented from being thermally destructed by an arc, and the insulated wire 29 is prevented from being broken due to its melting.

[0036]

As described above, according to the first aspect of the present invention, the O-ring and the contact electrode portion are connected by fitting the fitting concave portion and the fitting convex portion, so that the transportation of the insulating cover is achieved. The O-ring does not come off inadvertently at the time or when it is attached to the insulated wire, and the O-ring does not lose. For this reason, it is possible to prevent rattling of the discharge electrode and a decrease in water tightness due to mounting of the discharge electrode device without the O-ring.

Further, according to the second aspect of the present invention, since the flexible fold which comes into contact with and adheres to the insulated wire is formed integrally with the insulated cover, the discharge electrode device is attached to the insulated wire. The discharge electrode device no longer rattles or shifts during or after installation. Further, since the folds are formed integrally with the insulating cover, the folds can be easily attached to the insulated wire, and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a discharge electrode device according to the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is an inner view of a state where the discharge electrode device of FIG. 1 is opened.

FIG. 4 is a side view showing a state where the discharge electrode device of FIG. 1 is opened.

FIG. 5 is a central sectional view showing a state in which the discharge electrode device of FIG. 1 is closed.

FIG. 6 is a central sectional view showing a state where the discharge electrode device of FIG. 1 is attached to an insulated wire.

FIG. 7 is a plan view of a stopper.

FIG. 8 is a sectional view showing a contact electrode unit according to the present invention.

FIG. 9 is an enlarged cross-sectional view of an O-ring portion of the contact electrode portion of the present invention.

FIG. 10 is a sectional view of an O-ring.

FIG. 11 is a sectional view showing ribs and folds.

FIG. 12 is a sectional view showing a state in which the folds are in close contact with the insulated wire.

FIG. 13 shows an insulated wire having a diameter of 14.5 mm (60 sq).
(A) is a plan view, (b) is a side view, and (c) is a bottom view.

FIG. 14 is a plan view showing a state in which a spacer for 14.5 mm is attached to an insulating cover and the discharge electrode device is opened.

FIG. 15 is a side view of FIG. 14;

FIG. 16 is a central sectional view showing a state where the discharge electrode device is closed using the spacer of FIG. 13;

FIG. 17 is a central cross-sectional view showing a state where the discharge electrode device is attached to the insulated wire using the spacer of FIG. 13;

18A and 18B show spacers used when the diameter of the insulated wire is 9 mm, wherein FIG. 18A is a plan view, FIG. 18B is a side view, and FIG.

FIG. 19 is a plan view showing a state in which a spacer for 9 mm is attached to an insulating cover and the discharge electrode device is opened.

FIG. 20 is a side view of FIG. 19;

FIG. 21 is a diagram showing a use state of the discharge electrode device of the present invention.

FIG. 22 is a view showing a conventional insulator protection device.

FIG. 23 is a sectional view of a conventional discharge electrode device.

[Explanation of symbols]

 Reference Signs List 1 discharge electrode device 2 insulating cover 3 upper cover 4 lower cover 4f screw hole 14 fold 23 contact electrode portion 24 needle electrode 24a tip end of needle electrode 25 fitting concave portion 27 O-ring 27b fitting convex portion 29 insulated wire 29a covering portion 29b Core wire 30 Bind wire

Claims (2)

[Claims] An insulating cover (2) attached to an outer peripheral surface of an insulated wire (29) around which a bind wire (30) is wound.
Forming a screw hole (4f) in the insulating cover (2) and screwing the contact electrode portion (23) screwed into the screw hole (4f), and tightening the screw of the contact electrode portion (23). The tip (24a) formed into a needle shape with the core wire (29) of the insulated wire (29)
b) and the tip (24a) of the needle electrode (24) is brought into contact with the core wire (29b) of the insulated wire (29).
Contact with the insulated wire (29).
a) and an upper surface of the contact electrode portion (23), the discharge electrode device having an O-ring (27) which is in close contact with the O-ring (27) and one of the contact electrode portions (23). A discharge electrode device characterized in that a fitting recess is formed in the other part and an O-ring is provided by fitting the fitting protrusion and the fitting recess. 2. An insulating cover (2) attached to an outer peripheral surface of an insulated wire (29) around which a bind wire (30) is wound.
Forming a screw hole (4f) in the insulating cover (2) and screwing the contact electrode portion (23) screwed into the screw hole (4f), and tightening the screw of the contact electrode portion (23). The tip (24a) formed into a needle shape with the core wire (29) of the insulated wire (29)
b) and the tip (24a) of the needle electrode (24) is brought into contact with the core wire (29b) of the insulated wire (29).
Contact with the insulated wire (29).
a) and an upper surface of the contact electrode portion (23), the discharge electrode device having an O-ring (27) which is in close contact with the insulated wire (29) in the insulating cover (2). A discharge electrode device comprising a fold (14) having the following.