JPH0231938Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention limits or interrupts the follow-on current of the line due to lightning flashover in power transmission and distribution lines using insulated wires, eliminates wire breakage and damage to the insulator, and This invention relates to a lightning disconnection prevention device for insulated wires that protects the electrical power of the insulated wire and restores the insulation on its own in the event of a ground fault, thereby preventing power outages.

(Prior technology) When an impact high voltage due to a lightning surge is applied to a power transmission/distribution line using insulated wires, the insulation coating of the wire is penetrated and flashover occurs in the insulator. There was damage such as wires being fused and insulators being damaged. In addition, even if the wire did not break, the insulator did not have the ability to restore its insulation on its own, and ground fault relays and equipment at substations were activated, cutting off the power supply, resulting in power outages on the lines. Therefore, a current-limiting element containing a current-limiting element made of a material with non-linear voltage-current characteristics is inserted into the arcing horn attached to the cap fitting of the clamp-top insulator to limit or cut off the follow-on current caused by lightning flashovers. There are also known devices that prevent wire breakage and damage to the insulator, and also allow the insulator device to restore insulation on its own to prevent power outages on the line. In order to connect to the pole, it is necessary to strip off the insulating coating, and therefore it is necessary to attach an insulating cover to the energized parts such as the clamp part of the electric wire and the cap fitting to prevent electric shock, which takes time during pole installation work. It takes. In order to solve these problems, the present applicant applied for an insulator device with a current limiting element in which the arcing horn was shaped like a C ring in 1983.
-21006, but even if the above problem is solved by simply making the arching horn into a C-ring shape, if the current limiting element is destroyed for some reason such as a direct lightning strike or close lightning, the arcing horn and its There was a risk that related parts would fly off and fall, posing a danger to the ground or damaging the insulator itself.

(Problems to be solved by the invention) The present invention solves the above-mentioned conventional problems, and even if the current limiting element is destroyed for some reason such as a direct lightning strike or close lightning strike, the current limiting element will not be damaged by electrodes, arcing horns, or other related items. This device was developed for the purpose of a lightning breakage prevention device for insulated wires, in which the member is locked to the insulator body, so that there is no risk of the device being blown away.

(Means for Solving the Problems) The present invention, which was devised to solve the above problems, uses a current-limiting element with a built-in current-limiting element made of a material whose voltage-current characteristics are non-linear, with a grounding side electrode. In a lightning breakage prevention device for an insulated wire, the arcing horn surrounding the insulator body is attached to the energized side electrode of the current limiting element with an air gap between the insulated wire and the arcing horn is attached to a grounding object. The above-mentioned method is applied to the mounting end as being composed of a flexible C-shaped ring-shaped main body having a diameter larger than the trunk diameter of the main body, and a long U-shaped mounting end extending in the same plane from this main body. It is fixed to the power side electrode with a bolt, and its opposing open ends are removably connected by a connecting member, and the connecting part has an arc with an inner edge passing through the center of the insulator body and the open end. The arcing horn is characterized in that it is disposed within a position within ±30 of the average distance between the inner diameter of the arcing horn and the body span from the intersection with the inscribed circle of the horn.

The present invention will now be explained in detail with reference to illustrated embodiments.

1 is a grounding object such as a grounding arm;
A tight-tipped insulator main body 2 is fastened to its ground side end with a base metal fitting and a pin metal fitting that are integrally fixed. Reference numeral 3 denotes the head of the insulator body 2, and a wire receiving groove is provided around the head 3, and the covered wire 4 is inserted into the wire receiving groove without stripping the insulation coating, and the binding wire 5 is inserted into the wire receiving groove. It is fixedly supported by the head 3. 7 is a current limiting element 7 made of a material with nonlinear voltage-current characteristics.
The current limiting element 7 is made of a material such as silicon carbide or zinc oxide with non-linear voltage-current characteristics, and metal such as aluminum is welded to both end surfaces of the main body to form electrodes. Current limiting element 7 formed with a surface
A is sandwiched between a voltage-side electrode 7b and a ground-side electrode 7c, and only the tips of the voltage-side electrode 7b and ground-side electrode 7c are covered with a pleated insulator 7d such as rubber or synthetic resin. This current limiting element is fixed to a band fitting 11, which will be described later, attached to the insulator body 2 side with a ground side electrode 7c, similar to the conventional insulator device with a current limiting element.

In addition, the current-limiting element 7 has a C-shaped ring made of a highly flexible metal material such as aluminum alloy or brass having an inner diameter larger than the body diameter of the insulator body 2 on the main body part 8b. The arcing horn 8 has an elongated U-shaped mounting end 8c formed in the middle thereof so as to extend in the same plane from the main body 8b, and the main body 8b approximately surrounds the insulator body 2. Mounted horizontally. The opening width of the arcing horn 8, that is, the distance between the opposing opening ends 8a, 8a of the arcuate arms, is normally smaller than the trunk diameter D2 of the insulator body ₂ , but it is flexible when installed. The width of the opening can be expanded by utilizing the elasticity of the material, which has high elasticity, and the opposing opening ends 8a, 8a are hook-shaped so that they can be detachably connected after being surrounded by the insulator body 2. The opening end portions 8a, 8a are shown in FIG.
As shown in FIG. 2, a connecting member 9 such as a retaining ring
The insulated wire 4 and the arcing horn 8 are connected to each other so as to be able to be engaged and detached from each other by being locked under the spring, and a certain air gap is formed between the insulated wire 4 and the arcing horn 8. Further, the inner edge A of the connecting portion of the opening ends 8a, 8a, that is, the inner edge of the connecting member 9 is connected to the insulator body 2 and the opening end 8.
The average distance between the inner diameter D 1 of the arcing horn 8 and the body diameter D ₂ of the insulator body ₂ from the intersection P of the center line C passing through the center of the arcing horn 8 and the inscribed circle of the arcing horn 8 [(D ₁ - D ₂ )/2] is arranged on the center line C within ±30% of the insulator body 2 to form an annular conductor that surrounds the insulator body 2, so that during flashover, the discharge is caused by an arcing horn. 8 ensures that the arc is called. The connecting member 9 preferably has an arc shape equal to the curvature of the arcing horn 8, but it may have a straight shape or any other shape depending on the convenience of molding. The arcing horn 8 is connected and fixed by a holding plate 10a and a bolt 10b with the mounting end 8c aligned with the tip of the voltage-applying side electrode 7b, and the grounding side electrode 7c of the current limiting element 7 is connected to the base of the insulator body 2. It is connected and fixed with a bolt 13 to a freely openable and closable band metal fitting 11 which holds a metal fitting 6a and is tightened and fixed with a bolt 12.

(Function) With this structure, when an impact high voltage is applied to the line due to a lightning surge, a discharge is generated from the core wire or the bind wire 5, and the insulator body 2 passes through the air gap.
is captured by the arcing horn 8 which surrounds the entire circumference and is arranged in parallel to the insulated wire 4, and when this captured impact high voltage is applied to the current-applying side of the current-limiting element 7a, the current-limiting element 7a reduces the resistance value due to the nonlinearity of its voltage-current characteristics and allows a large current to flow.
After the impact high voltage disappears, the resistance value is restored and the insulator device quickly restores its insulation.

In particular, in the present invention, the main body 8 of the arching horn 8
b is the body diameter D of the insulator body 2, and the flexibility C is larger than ₂ .
Not only is it shaped like a ring, but the opposing open ends 8a, 8a are removably connected by a connecting member 9, so that when the open ends 8a, 8a are uncoupled, the electric wire remains supported. Since the cross section of the insulator body 2 can be freely passed through in this state, repair work can be carried out on the existing tongue-top type insulator in a short time without causing a power outage to the railway line. Furthermore, since the open ends 8a and 8a are connected after installation, if the current limiting element is destroyed for some reason such as a direct lightning strike or close lightning strike, the arcing horn 8 will be locked to the insulator body 2 and other This prevents the insulator body 2 from falling away from the lightning disconnection prevention device together with related parts.
It can be held securely to prevent danger from falling. Also, the main body portion 8b of this arcing horn 8
Since it has a flexible C-shaped ring shape, it has a buffering effect, and there is no fear that the insulator body 2 will be damaged by the arcing horn 8. Furthermore, the open end 8
By connecting a and 8a, the rigidity of the arcing horn 8 is increased, which is effective in suppressing deformation due to external force and maintaining stability of the horn coordinates. Furthermore, when connecting the open ends 8a, 8a, the inner edge A of the connecting portion is connected to the arcing horn from the intersection P of the center line C of the insulator body 2 and the open ends 8a, 8a and the inscribed circle of the arcing horn 8. 8
The annular conductor surrounding the insulator body ₂ is arranged within ±30% of the average distance between the inner diameter _D1 and the body diameter D2, so the open ends 8a, 8a are in an open state. There is also the advantage that the arc-inducing property is significantly improved compared to the case where it is.

Furthermore, in this invention, arcing horn 8
consists of a flexible C-shaped ring-shaped main body part 8b and a long U-shaped mounting end part 8c extending in the same plane from this main body part 8b, and this mounting end part 8c is connected to the current-limiting element 7. Since it has a structure fixed to the power supply side electrode 7b with a bolt 10b, the installation work is easy, and the flexibility of the entire arcing horn 8 is further increased by the long U-shaped mounting end 8c.
Even when the opening ends 8a, 8a are opened and the insulator main body 2 is passed through, the entire arcing horn 8 is not distorted.
It has the advantage of being able to maintain the correct air gap.

(Effects of the invention) As explained above, the present invention is not only highly effective in maintaining the stability of power transmission and distribution lines, but also enables easy installation of poles and maintains the correct air gap. Because of its advantages, its practical value is extremely great.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention, and FIG. 2 is a partially cutaway plan view thereof. 2: insulator body, 4: insulated wire, 7: current limiting element,
7a: current limiting element, 7b: energizing side electrode, 7c: grounding side electrode, 8: arcing horn, 8a: open end, 8b: main body, 8c: mounting end, 9: connecting member, 10b: bolt, C: Center line, P: Intersection,
D ₁ : Inner diameter of arching horn, D ₂ : Body diameter.

Claims (1)

[Scope of utility model registration request] A current-limiting element 7 having a built-in current-limiting element 7a made of a material with non-linear voltage-current characteristics is attached to a grounded object with a grounding side electrode 7c, and the current-limiting element 7 is
In the lightning disconnection prevention device for an insulated wire, an arcing horn 8 surrounding the insulator body 2 is attached to the energizing side electrode 7b of the insulated wire 4 with an air gap between the arcing horn 8 and the insulated wire 4,
The arcing horn 8 is connected to the body diameter D ₂ of the insulator body 2.
a flexible C-shaped ring-shaped main body portion 8b with a larger diameter;
It consists of a long U-shaped mounting end 8c extending in the same plane from the main body 8b, and the mounting end 8c is fixed to the power-supplying electrode 7b with a bolt 10b, and the opposite open end 8a,
8a are removably connected by a connecting member 9, and the inner edge A of the connecting portion is located between the center line C passing through the center of the insulator body 2 and the open ends 8a, and the inscribed circle of the arcing horn 8. ±30% of the average distance between the inner diameter D ₁ of the arcing horn 8 and the body diameter D ₂ from the intersection P
A device for preventing lightning disconnection of an insulated wire, characterized in that the device is arranged within a position within