JPH08321372A - Dynamic current breaking arc horn - Google Patents

Abstract

PURPOSE: To break dynamic current in a breaking insulation cylinder connected to a grounding arc horn, upon the occurrence of an electric shock, by applying the constitution that an intermediate electrode inserted in the intermediate section of the cylinder is faced to the end of an line arc horn, and the cylinder is inclined by the required angle. CONSTITUTION: The base end of a breaking insulation film cylinder 7 is integrally fixed to the end of a grounding arc horn 6 having two projected annular ribs 14. Also, a conductive intermediate electrode 18 is inserted in the cylinder 7 and fixed to one side thereof near an opening 17, so as to be faced to the end of a line arc horn 10. Furthermore, a total of a distance between the end 28 of the arc horn 6 faced to the through-hole 26 of the cylinder 7 and the electrode 18, and a distance between the arc horn 10 and the electrode 18, is made approximately equal to or shorter than a distance between the end 28 of the arc horn 6 and the end of the arc horn 10. For this purpose, the cylinder 7 is laid slantwise. According to this construction, a flashover always takes place across both of the arc horns 6 and 10 via the electrode 18, upon the occurrence of an electrical shock. Also, the ribs 14 act to prevent the detachment of the cylinder 7 due to a high-pressure gas injection at the time of the electrical shock.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided on the ground side of a conductor support insulator device, and interrupts a follow-up current at the time of a lightning strike before a breaker or the like of a power transmission line operates to prevent a power failure accident.
The present invention relates to a follow-current cutoff type arc horn capable of supplying stable power.

[0002]

2. Description of the Related Art In a continuous-current circuit breaker of this type, for example, a hollow cylinder having a bottom, which is an insulating material, is attached to the tip of an arc horn,
An arc-extinguishing arc integrally formed by mixing an arc-extinguishing agent containing a specified amount of refractory fiber and arc-extinguishing powder with a small amount of water, drying, and inserting a metal wire fuse into the center of the arc-extinguishing agent. A continuous-current cut-off type flash indicator that encloses a cylinder (Japanese Patent Laid-Open No. 59-2141).
No. 80) is proposed. This is because the arc extinguishing agent is melted by the follow-up arc, evaporated, decomposed, and adiabatically cooled in the process of removing the heat of fusion and the heat of evaporation from the arc energy and further removing the heat of decomposition and cooling it. The current of the alternating current flowing between the arc horns is interrupted by the action of extinguishing the arc, and the flash indicator is entirely ejected from the arc horn by the injection of the high pressure gas, so that the flash points are removed. It has a labeling function. However, this is expensive because the flash arc indicator becomes large in size as a whole because the insulating arc-extinguishing tube is housed in the insulating bottomed tube and the marking function is obtained, and it cannot be reused.

Further, a plurality of pressure vessels, each of which has a high-insulating high-pressure gas sealed inside, are installed in parallel at the tip of the arc horn, and the periphery thereof is insulation-coated with a flame-retardant insulating material. There is proposed an arc extinguishing horn (special opening and closing No. 6-64957) in which a gas discharge hole reaching the mouth of the container is provided through and a fuse is mounted inside the gas discharge hole. This one blows out the arc by jetting high-pressure gas from the pressure vessel whose mouth is melted by the arc during a lightning stroke, and creates a follow-up flow that tries to flow along the path where the arc is formed. Since it shuts off, a pressure vessel is required at the tip of the arc horn, and its mounting means is complicated. Also, since multiple pressure vessels are required to prepare for multiple lightning strikes,
As the tip of the arc horn becomes large, the manufacturing cost rises.

However, both conventional products require a large amount of high-pressure gas because they inject high-pressure gas into the discharge path in the atmosphere to interrupt the follow-up flow. Also, when the conductor suspension insulator device is provided on the ground side to interrupt the follow-up current, the arc heat may damage the line.

In contrast to the above conventional products, there has been proposed an aerk horn for an overhead wire which is equipped with a pressure vessel filled with high-pressure gas and a follow-current interrupting device capable of interrupting the follow-current without an arc extinguishing agent. (JP-A-6-342685). In this type, the tip of the ground side arc horn is projected outward, and a conductive member is provided in the middle of the insulating cylinder fixed to the ground side arc horn.
It is inserted so that it faces the tip of the insulating tube, and when the two arc horns are flashed through the conductive member during a lightning stroke, the inner surface of the insulating cylinder is melted by the arc and decomposed gas. Is generated, and the air inside the insulating cylinder is heated by an arc, etc., causing the pressure inside the cylinder to rise rapidly, and this high-pressure gas is injected almost at right angles to the discharge path in the atmosphere, creating a As a result, the dielectric strength in the insulating cylinder increases and the follow-up flow is interrupted in the insulating cylinder.

[0006]

The overhead phone arc horn provided with the above-mentioned continuous current cutoff device has an inexpensive structure which does not require a pressure vessel or an insulating arc-extinguishing tube, and yet has a high pressure gas injection. Since the direction is almost perpendicular to the discharge path direction, the line
It will not be melted down by burrs. However, as a result of diligent examination of various performances after changing the shape, size and other conditions after the application, this product occasionally has an insulating cylinder that covers the tip of the ground side arc horn 52 as shown in FIG. Hole 5 in the body with an arc
3, or the surface winding on the insulating cylinder 51 as shown in FIG. 8 prevented the follow-up current from being interrupted. In addition, even if a flashover occurs through the conductive member 54, the ground side ground
The insulating cylinder 51 is destroyed by the thermal effect of arc diffusion at the corners of the tip surface of the horn 52, or the insulating cylinder 51 is dropped from the arc horn 52 by jetting high pressure gas. There was something to do.

The present invention has been made in view of the above points. A first object of the present invention is to reliably interrupt a follow-up current at the time of a lightning stroke in an insulating insulating cylinder provided in a ground side arc horn. The second purpose is to provide a low-cost follow-current interrupting type arc horn. The second purpose is to remove the insulating cylinder for insulation from the ground side arc horn and to connect the ground side arc horn tip. -To prevent breakage of the insulating cylinder for blocking due to diffusion.

[0008]

In the follow current cutoff type arc horn according to the present invention, the ground side arm is provided at the base.
An intermediate electrode is inserted into one side of the insulating insulating cylinder fixed to the tip of the horn, and the intermediate electrode is opposed to the tip of the line side horn, and the intermediate electrode and the line side A
The sum of the distance from the tip of the horn and the tip of the ground side arc horn and the intermediate electrode in the through hole of the insulating insulating cylinder is equal to the tip of the line side horn. The grounding side arc horn is attached to the ground side horn attachment of the conductor supporting insulator device by inclining the insulating cylinder for insulation so that the distance from the tip of the side arc horn is approximately equal to or shorter than the distance. It is characterized by being fixed to.

Here, the conductor supporting insulator device refers to a conductor suspension insulator device and a conductor tension insulator device.

Further, in the conductor suspension insulator device, an intermediate electrode is inserted into one intermediate portion of the insulating insulating cylinder fixed to the tip of the ground side arc horn at the base portion, and the intermediate electrode is connected to the line. While facing the tip of the side arc horn and tilting the blocking insulation cylinder toward the line so that the high pressure gas injected from the blocking insulation cylinder does not hit the line directly during a lightning strike, the ground side arc horn By fixing the cable to the ground side horn fixture of the conductor suspension insulator device, the distance of the flashover system path (excluding the intermediate electrode length) passing through the intermediate electrode can be increased as described above.
The distance (including the thickness of the insulating cylinder) between the tip of the cable and the tip of the line side arc horn can be made substantially equal to or shorter.

Here, "substantially equal" means that, even if the former, which passes through the intermediate electrode in terms of distance, becomes slightly longer than the latter, which does not pass through the intermediate electrode, the thickness of the latter insulating insulating cylinder is replaced by the air discharge interval. It is short when compared to the length of the case. Therefore, in the present invention, at the time of a lightning stroke, both arc horns always flash through the intermediate electrode.

In the present invention, since the inner surface of the through hole of the insulating insulating cylinder is melted by the arc caused by the lightning stroke during the lightning stroke, decomposed gas is generated, and the air in the insulating cylinder is heated by the arc or the like. The pressure inside the insulating cylinder rises sharply. This high-pressure gas is jetted together with the arc from the opening end of the insulating cylindrical body to cut off the follow flow in the insulating cylinder for blocking. That is, high-pressure gas is jetted together with an arc from the insulating insulating cylinder in a jet form, and the pressure effect and diffusion action increase the dielectric strength of the generated gas, and the arc length increases and the cooling action increases the arc length.
On the other hand, the insulation resistance increases, while the blocking insulation cylinder becomes a kind of vacuum, increasing the dielectric strength of the thin and short section between the ground-side arc horn tip and the intermediate electrode. Will be shut off immediately. Therefore, the purpose can be achieved with a relatively small flow rate of high-pressure gas, while the high-pressure gas does not hit the line directly, so that the line is not damaged.

If a fold is formed near the tip of the ground side arc horn and the tip of the arc horn including the fold is covered with the base of the insulating insulating cylinder, a high pressure gas at the time of lightning strike The insulating cylinder for shut-off does not fall off from the arc horn by the injection of. Further, since the creepage distance can be increased by forming the folds in the insulating insulating cylinder, it is possible to prevent surface creepage in the insulating insulating cylinder.

The tip of the ground side arc horn has a tapered taper shape so that the arc is focused when the tip faces the through hole, so that a jet effect of high-pressure gas is produced. And the destruction of the insulating cylinder portion due to the diffusion of arc can be eliminated.

The thickness of the insulating insulating cylinder is made thick so that the follow-up current can be interrupted each time a plurality of lightning strokes occur.

[0016]

EXAMPLES Examples of the present invention will be described with reference to the drawings. 1 and 2, 1 is 22 KV to 77 KV
The following flow interruption type arc horn attached to the ground side horn fixture 3 of the conductor series suspension insulator device 2 in the target overhead power transmission line by the mounting seat 15 is shown. 3 and 4, 1 is 2
1 shows a follow-current cut-off arc horn attached to a ground-side horn fixture 5 of a conductor series tension insulator device 4 in an overhead transmission line of 2 KV to 77 KV with a mounting seat 15. In the figure, 8 is a steel tower arm mount, 9 is an insulator string, 10 is a track side arc horn, 11 is a suspension clamp, and 12 is a tension clamp.

As shown in FIG. 5, the follow-current cutoff arc horn 1 is formed by integrally fixing a base portion of a cut-off insulating cylindrical body 7 to a tip end portion of a ground side arc horn 6. . As the fixing means, in the present embodiment, two annular folds 14 and 14 are provided in series in the vicinity of the tip of the ground side arc horn 6 at appropriate intervals, and these two annular folds 14 and 14 are provided in series. The front end of the horn including is covered with the base of the insulating insulating cylinder 7. With this configuration, the insulating insulating cylinder 7 is prevented from dropping from the arc horn by the injection of high-pressure gas at the time of lightning stroke, and the insulating insulating cylinder 7 is formed with the annular folds 14 and 14 so that the creeping surface You can earn distance. The ground side arc horn 6 is covered with a soft vinyl chloride material 16 in order to secure insulation strength against a commercial frequency against ground voltage, except for the mounting seats 15 at the front end and the base end.

The blocking insulating cylinder 7 shown in FIG. 5 is composed of two layers of soft and hard vinyl chloride cylinders 7a and 7b, and has a conductive intermediate electrode on one side near the opening end 17. 18 is inserted. The intermediate electrode 18 is capable of withstanding a predetermined number of lightning strokes, and the intermediate collar portion 20 is positioned within the bulging portion 19 of the one-layer rigid vinyl chloride tubular body 7a. 7b has a flat surface portion 21 and a tip flange portion 2
2 is abutted to prevent the insulating cylinder 7 from breaking off. The reason why the insulating insulating cylinder 7 has two layers is mainly for manufacturing reasons. Two layers of the insulating insulating cylinder 7 may be made of soft or hard vinyl chloride. A hard or soft vinyl chloride cap 25 is attached to the front end opening 24 of the insulating insulating cylinder 7 to prevent rainwater, dust, and the like from entering the through hole 26.

In the continuous flow interrupting type arc horn 1 attached to the conductor continuous tension insulator device 4, the intermediate electrode 18 is opposed to the tip of the line side arc horn 10, as shown in FIGS. At the same time, at the distance l ₂ between the tip 28 of the ground side arc horn 6 and the intermediate electrode 18 facing the through hole 26 of the blocking insulating cylindrical body 7, the tip of the line side arc horn 10 and the intermediate electrode 18 are connected. Distance L ₁
Is approximately equal to the distance l ₃ between the tip of the ground side arc horn 6 and the tip of the line side arc horn 10 (including the thickness of the insulating cylinder 7 for interruption), Alternatively, the cut-off insulating cylindrical body 7 is inclined so as to be slightly shorter. Here, the substantially equal, even if the distance to the distance L ₁ was added distance l ₂ is slightly longer than the distance l _3, the thickness of the blocking insulating cylinder 7 of the distance l ₃ to aerial discharge gap The case is shorter than the distance l ₃ when replaced. Therefore, at the time of a lightning stroke, both arc horns 6 and 10 always flash through the intermediate electrode 18.

As shown in FIGS. 1 and 2, the insulation cylinder 7 for interrupting the continuous flow interrupting arc horn 1 mounted on the conductor series suspension insulator device has the intermediate electrode 18 in the direction substantially orthogonal to the line, and the line side. It is opposed to the tip of the arc horn 10 and is tilted to such an extent that the high pressure gas injected from the insulating insulating cylinder 7 at the time of a lightning stroke does not directly hit the armor lot 27 wound around the electric wire. In the present embodiment, the angle of inclination of the insulating insulating cylinder 7 is 10 to 20 ° with respect to the insulator connecting shaft line. With such an attachment, the distance L ₁ is changed to the distance L ₂ described in FIG. The added distance can be approximately equal to or slightly shorter than the distance l ₃ . If this condition cannot be satisfied, the insulating cylinder 7 for insulation between the tip of the ground side arc horn 6 and the tip of the line side arc horn 10 is provided.
The thickness of the part may be increased. That is, the insulating cylinder 7 for interruption
If the thickness of is replaced by the air discharge interval, the air discharge interval becomes much longer than the thickness of the cylindrical body 7. Therefore, it can be solved by selecting the thickness of the cylindrical portion.

The thickness of the insulating insulating cylinder 7 shown in FIG. 5 is designed so that the follow-up current can be interrupted each time a plurality of lightning strokes occur. The body 7 was thickened so as not to break and fall. The insulating insulation cylinder 7 shown in FIG. 6 has been made lighter, and even if the arc insulation continues and the insulating insulation cylinder 7 breaks and falls, it will be further damaged to a level below the steel tower. It is made of thin vinyl chloride.

The grounding side arc horn 6 has a tapered taper-like end, and the tip is made as narrow as possible to face the through hole 26 of the insulating insulating cylinder 7. For this reason, the
Can be focused to further increase the jetting speed of high-pressure gas, and since there is no arc diffusion, it is possible to prevent breakage or scattering of the insulating insulating cylinder portion that covers the tip of the arc. .

[0023]

As described above, according to the present invention, the flashover of the arc horn at the time of lightning is always mediated by the intermediate electrode of the insulating insulating cylinder fixed to the ground side arc horn. In addition to the above, the following flow is interrupted by the high-pressure gas generated in the insulating insulation cylinder by arc heat so that the follow-up current can be interrupted in the insulating insulation cylinder. It is possible to reliably cut off the follow-up flow of time.

Since a fold is formed near the tip of the grounding side arc horn and the horn tip including this fold is covered by the base of the insulating insulating cylinder, a high pressure gas at the time of lightning strike The insulating cylinder for shut-off does not fall off from the arc horn by the injection of. Further, since the creepage distance can be increased by forming the folds in the insulating member for blocking, it is possible to prevent a flashover from the creeping surface.

The tip of the grounding side arc horn is tapered.
Since the arc jet is focused, the jetting effect of the high pressure gas can be further enhanced, and the breakage of the insulating insulating cylinder due to the diffusion of the arc can be eliminated.

Since the thickness of the insulating insulating cylinder is large, it is possible to interrupt the follow-up current every time a plurality of lightning strokes occur.

[Brief description of drawings]

FIG. 1 is a front view of a series of suspension insulator devices embodying the present invention.

2 is a side view of the series suspension insulator device shown in FIG. 1. FIG.

FIG. 3 is a side view of a series of tension-resistant insulator devices embodying the present invention.

4 is a plan view of the series of tension insulator devices shown in FIG. 3. FIG.

FIG. 5 is a vertical cross-sectional view of a blocking insulating cylinder according to an embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of a blocking insulating cylinder according to another embodiment of the present invention.

FIG. 7 is an explanatory diagram of an example of failure in shutting off the follow current in a conventional product.

FIG. 8 is an explanatory diagram of another example of failure in shutting off the follow current in the conventional product.

[Explanation of symbols]

 2 Conductor suspension insulator device 3 Grounding side horn mounting device 4 Conductor tension insulator device 5 Grounding side horn mounting device 6 Grounding side arc horn 7 Isolation insulating cylinder 10 Track side side arc horn 14 Fold 18 intermediate electrode 26 through hole

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Sugio Imoto 3-22 Nakanoshima, Kita-ku, Osaka City Kansai Denryoku Co., Ltd. (72) Tohru Nakayasu 3-22 Nakanoshima, Kita-ku, Osaka No. Kansai Denryoku Co., Ltd. (72) Inventor Takashi Chino 2-6-1, Nagasaka, Yokosuka City, Kanagawa Prefecture Central Research Institute of Electric Power Industry, Yokosuka Research Institute (72) Yoshihisa Maeda 13 Isoshimaminamicho, Hirakata, Osaka Prefecture No. 1 in Nihon Katan Co., Ltd. (72) Inventor Akihiro Katayama 13-1 Isoshima-Minamicho, Hirakata-shi, Osaka Japan Cat-In Co. Ltd. (72) Hiroki Sakamoto No. 13-1 Isojima-Minami-cho, Hirakata-shi, Osaka Japan Kata Within the corporation

Claims (7)

[Claims] 1. An intermediate electrode is inserted into one intermediate side of an insulating insulating cylinder fixed to the tip of the ground side arc horn at the base, and this intermediate electrode is connected to the line side arc horn. While facing the tip, at the distance between the intermediate electrode and the tip of the line side arc horn, the intermediate electrode in the through hole of the insulating insulating cylinder and the ground side arm are provided.
Isolation insulating cylinder so that the distance added to the tip of the horn is approximately equal to or shorter than the distance between the tip of the line side horn and the tip of the ground side ark horn. Is tilted to fix the ground side arc horn to the ground side horn fixture of the conductor support insulator device.
Kuhhong. 2. The follow-current cutoff type arc horn according to claim 1, wherein the conductor supporting insulator device is a conductor suspension insulator device. 3. The follow-current cut-off arc horn according to claim 1, wherein the conductor supporting insulator device is a conductor tension insulator device. 4. A conductor suspension insulator device, wherein an intermediate electrode is inserted into one intermediate side portion of a blocking insulating cylinder fixed to a tip portion of a ground side arc horn at a base portion, and the intermediate electrode is connected to a line side. While facing the tip of the arc horn and tilting the blocking insulating cylinder toward the line so that the high pressure gas injected from the blocking insulating cylinder does not hit the line directly during a lightning strike, the ground side arc horn Is fixed to the ground side horn fitting of the conductor suspension insulator device. 5. The follow-current cutoff type according to claim 1 or 4, wherein the grounded side arc horn has a taper-shaped tip end portion, and the tip end is desired to pass through the through hole of the insulating cylinder for cutoff. Ark horn. 6. The grounding side arc horn is provided with a fold near the tip thereof, and the horn tip including the fold is covered with the base of the insulating insulating cylinder. Follow current blocking arc horn. 7. The follow-current cutoff arc horn according to claim 1, 4 or 6, wherein the cut-off insulating cylindrical body is thickened so as to cut off the follow-up current each time a plurality of lightning strokes occur.