JP2001102149A - Apparatus for arc-extinguishing in an arcing horn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for arc-extinguishing that works reliably in repeated uses. SOLUTION: At least one of the leading arcing horn and grounding arcing horn is provided with a thin tube-type cutoff device 4 at the leading end, which is provided with an intermediate horn 5 with a leading end 5a. A failure current causes an arc between the base end 5a of the intermediate horn 5 and the leading end 2a of the arcing horn having the thin tube-type cutoff device 4. The highly pressurized gas generated by the arc in the cutoff device 4 is made to flow into a gas storage chamber 6. If the internal pressure of the cutoff device 4 exceeds a given value, the port of discharging mechanism 7 is opened to discharge the high pressure gas from the cutoff device 4, and the high pressure gas of the gas storage chamber 6 is caused to flow into the cutoff device 4 to blow out the arc in a half cycle based on an application frequency of 50 or 60 Hz.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a suspension insulator device for supporting electric wires of an overhead line and an arc extinction device for a fault current flowing through an arc horn attached to a tension insulator device. One-wire ground fault current and short-circuit current generated in the arc horn during lightning damage are cut off within half a cycle, so the circuit breaker in the substation does not operate, so the re-closing operation of the circuit breaker can be omitted, and it is stable even during lightning damage Power can be supplied.

[0002]

2. Description of the Related Art At present, the only practical technique for interrupting current is plasma temperature control. The change in the conductivity of the arc plasma is mainly performed by controlling its temperature.
That is, it is important to produce an arc plasma having as large a conductivity as possible, to apply a large current, to cool this effectively and quickly, and to convert it into a highly insulating gas space in a short time.

[0003] As a technique for interrupting a one-line ground fault current generated in an arc horn at the time of lightning damage, a continuous flow interrupting arc horn in which an insulating cylinder is provided on a ground-side horn has been proposed (JP-A-8-321372). ). This is because an arc generated in the insulating cylinder generates a decomposition gas, and the air in the insulating cylinder is heated by the arc or the like, so that the pressure in the insulating cylinder rapidly increases. This high-pressure gas is jetted from the opening end of the insulating cylinder together with the arc in the form of a jet to cut off the arc in the insulating cylinder.
However, this shut-off method has a low ability to cool the arc, and the generated decomposition gas is released to the outside of the insulating cylinder together with the pressure. Therefore, the dielectric strength at the place where the arc is generated after the arc is extinguished is low. That is, since the arc extinguishing force is weak, the current is small, and the voltage and the current have a large defect that only the one-line ground fault current at the time of the one-line ground fault that is close to the same phase can be cut off.

[0004] Overhead line faults during lightning damage include ground faults and ground fault / short circuit faults. If one arc horn on the overhead line flashes due to lightning damage, a one-line ground fault occurs, and a one-line ground fault current flows. In this case, the one-line ground fault current is relatively small (at most 1 kA or less) and the rising speed of the transient recovery voltage applied to the space where the arc is extinguished is small. Easy to cut off.

On the other hand, if two or three arc horns on an overhead line flash due to lightning damage, a two- or three-wire ground fault or short circuit fault will occur. The short-circuit current in this case is large (up to about 13
kA), the transient recovery voltage applied to the space where the arc is extinguished oscillates at a natural frequency due to the line resistance, reactance, and ground capacitance of the overhead line, so that the voltage peak value increases and the rising agility increases. Become. For this reason, it is naturally difficult to cut off the current with the shut-off method having a weak arc-extinguishing force.

If a short-circuit current flows through the above-mentioned insulating cylinder, it cannot be cut off. Therefore, the inner diameter of the insulating cylinder becomes large, or the insulating cylinder is pierced. Disappears. Therefore, when a short-circuit current flows, it is necessary to replace the continuity interrupting arc horn by interrupting the overhead line.

A cap made of vinyl chloride is provided at the tip of the insulating cylinder to prevent rainwater, dust and the like from entering the insulating cylinder. Since the tip cap flies, the rainwater may enter the insulating cylinder in the case of a reverse tension arrangement or the like, so that even a single-line ground fault current may not be cut off.

[0008]

However, the above-mentioned arc horn of the continuous flow cutoff type has a weak arc-extinguishing force, so that the short-circuit current cannot be cut off. When the short-circuit current flows, the function is not exhibited on the steel tower. It will be left alone. Then, at the time of the power outage work, the arc horn for interrupting the downstream current must be replaced immediately. Further, once the one-line ground fault current is cut off, the tip cap flies, so that the tip cap has to be reattached in order to prevent moisture from entering the insulating cylinder.

SUMMARY OF THE INVENTION The present invention has been made to solve these drawbacks, and is intended to solve the above-mentioned drawbacks. In the event of a lightning strike, the tip of only the line-side arc horn, the tip of only the ground-side arc horn, or the line-side arc horn and the ground-side arc horn are provided. The present invention provides an arc horn extinguishing device that reliably flashes in a thin-tube type interruption section provided at both ends of the arc horn and interrupts a generated one-line ground fault current and a short-circuit current within a half cycle. Since the pressure mechanism returns to its original state, an arc horn extinguishing device that does not allow moisture, moisture, etc. to enter the narrow tube-shaped cut-off portion, and an arc horn that has a flashing display function that can determine the activated arc horn from under the steel tower An object of the present invention is to provide an arc extinguishing device.

[0010]

In order to achieve the above object, an arc horn extinguishing device according to the first aspect of the present invention has a thin tube-shaped cut-off portion at least one end of a line side arc horn and a ground side arc horn. At the same time, the intermediate horn facing the arc horn whose tip is opposed to the thin tube-shaped cut-off portion is attached, and a failure occurs between the base end of the intermediate horn of the thin tube-shaped cut-off portion and the tip of the arc horn to which the thin tube-shaped cut-off portion is attached. An arc is generated by the electric current, and the high-pressure gas generated in the capillary-shaped cut-off portion by the arc is caused to flow into the gas storage chamber, and when the pressure in the capillary-shaped cut-off portion exceeds a predetermined value, the port of the pressure release mechanism is opened. To discharge the high-pressure gas in the capillary-shaped cut-off portion, and to flow the high-pressure gas from the gas storage chamber back into the capillary-shaped cut-off portion, so that the arc is subjected to a half cycle (50% of commercial frequency). The other is intended to blow in less than a reference) to 60Hz.

Therefore, at the time of lightning damage, an arc is generated between the intermediate horn and the tip of the arc horn facing the intermediate horn due to a fault current. Due to this arc, high-pressure gas is generated, and the pressure inside the narrow tubular cut-off portion becomes high. The high-pressure gas is discharged from the port of the pressure release mechanism and simultaneously flows into the gas storage chamber. Then, when the pressure in the gas storage chamber becomes higher than the pressure in the narrow tube-shaped cutoff section, the high-pressure gas in the gas storage chamber flows back into the narrow tube-shaped cutoff section and blows out the arc within a half cycle. Thereafter, the high-pressure gas passes through the inside of the narrow tube-shaped cutoff portion and is discharged from the port.

According to a second aspect of the present invention, the arc horn arc extinguishing device has a volume in which the pressure in the gas storage chamber is maximized immediately before the fault current is extinguished, so that the arc can be blown out. When the fault current becomes weak to the extent possible, the high-pressure gas is caused to flow back into the narrow tubular cut-off portion. Therefore, after the arc has weakened sufficiently, the high-pressure gas in the gas storage chamber flows back into the capillary tube cutoff.

According to a third aspect of the present invention, the arc horn arc extinguishing device closes the port after the pressure release mechanism discharges the high-pressure gas that has blown out the arc. Therefore, after the arc is extinguished and the insulating property is restored, the port is closed and the inside of the thin tube-shaped cutoff portion is sealed. For this reason, it is possible to prevent moisture, moisture, dust, and the like from entering the inside of the narrow tubular blocking portion.

The arc horn extinguishing device according to a fourth aspect of the present invention is provided with irregularities for increasing the creepage distance on the outer surface of the narrow tubular blocking portion. Since the thin tube-shaped cut-off portion has a structure having a back electrode, it is easy to flash between the line-side arc horn and the ground-side arc horn through the outer surface of the thin tube-shaped cut-off portion during lightning damage. For this reason, in the present invention, the flashover is prevented by providing the unevenness to increase the creepage distance on the outer surface of the narrow tubular blocking portion.

Furthermore, in the arc horn extinguishing device according to the fifth aspect, flashing display means that changes color or deforms due to the radiant heat of the arc is mounted near the pressure release mechanism or the intermediate horn. In the arc extinction device of the described arc horn, flashing display means that moves or deforms due to the pressure of the high-pressure gas is mounted near the pressure release mechanism or the intermediate horn. Therefore, when an arc flows through the narrow tube-shaped cut-off portion and the pressure release mechanism is operated, the flash display means is discolored, deformed, and moved. Maintenance personnel under the tower can check the discoloration and the like with binoculars or the like, and can find the activated arc horn, which contributes to a reduction in maintenance and inspection costs.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail based on the best mode shown in the drawings. 1 to 5 show an embodiment of the arc horn extinguishing device of the present invention. The arc extinction device 1 for an arc horn includes at least one of a track side arc horn 3 and a ground side arc horn 2,
In the present embodiment, the thin-tube-shaped cut-off portion 4 is attached to the tip 2a of the ground-side arc horn 2, and the tip 5a is opposed to the thin-tube-shaped cut-off portion 4 in this embodiment. An intermediate horn 5 is attached so that an arc due to a fault current is generated between the base end 5b of the intermediate horn 5 of the thin-tube type interrupting portion 4 and the tip 2a of the ground-side arc horn 2, and the arc causes the thin-tube interrupting portion. While the high-pressure gas generated in the inside 4 flows into the gas storage chamber 6, the port 8 of the pressure release mechanism 7 is opened by opening the port 8 of the pressure release mechanism 7 when the pressure in the thin-tube shut-off section 4 becomes larger than a predetermined value. The gas is discharged, and high-pressure gas is flowed back from the gas storage chamber 6 into the narrow tube-shaped shut-off portion 4 to blow out the arc within a half cycle (based on a commercial frequency of 50 or 60 Hz). The pressure release mechanism 7 closes the port 8 after discharging the gas from which the arc has been blown out.

The material (thickness, inner diameter) of the thin tube-shaped cut-off portion 4 and the distance (gap length) between the tip 2a of the ground-side arc horn 2 and the base end 5b of the intermediate horn 5 are determined by one-line ground fault current and short-circuit. It is designed to be able to interrupt the current many times within half a cycle. For example, a material (vinyl chloride or the like) that releases a large amount of decomposition gas by the radiant heat of the arc is used, the thickness is about 10 mm, the inner diameter is 5 mmφ, and the gap length is 22, 22 in consideration of bird damage to overhead lines. About 60 mm is recommended for a 33 kV overhead line, and about 130 mm is recommended for a 66, 77 kV overhead line. In addition, not only vinyl chloride, but also the tubular blocking section 4 may be formed of, for example, vulcanized fiber, Delrin, or the like, and the tubular blocking section 4 may be formed of other materials.

On the outer surface of the thin tube-shaped blocking portion 4, irregularities 9 for increasing the creeping distance (distance along the outer surface of the thin tube-shaped blocking portion 4) are provided. In the present embodiment, a plurality of flanges are formed in the vicinity of the exposed portion of the ground-side arc horn 2 to form a plurality of irregularities on the outer surface of the narrow tube-shaped interrupting portion 4 to increase the creepage distance. Since the thin tube-shaped breaking portion 4 has a structure having a back electrode, the tip 3a of the line-side arc horn 3 and the attachment 12 of the ground-side arc horn 2 pass through the outer surface of the thin tube-shaped breaking portion 4 at the time of lightning damage. It is easy to flash between them. This phenomenon is prevented to prevent the ground-side arc horn 2 in the narrow tube type cut-off portion 4 from being formed.
In order to reliably cause flashover between the distal end 2a of the intermediate horn 5 and the base end 5b of the intermediate horn 5, a large number of irregularities 9 are provided on the outer surface of the tubular tubular blocking portion 4 to increase the creepage distance of the outer surface.

In the upper part of the gas storage chamber 6, a circular tube-shaped cut-off portion fall prevention fitting 13 is provided on the upper portion of the gas storage chamber 6 so that the tube-shaped cut-off portion 4 does not come off from the ground-side arc horn 2 due to the reaction of gas ejection when an arc is generated. Is embedded. The thin tube-shaped blocking portion fall prevention metal fitting 13 is fixed to the ground-side arc horn 2 by welding or the like, for example.

The intermediate horn 5 is designed to have such a thickness that the intermediate horn 5 is not consumed by the energy injected into the electrode points of the multiple short-circuit current arcs. For example, the outer diameter is about 12 mmφ.

The gas storage chamber 6 is provided at the base 4
a. The gas storage chamber 6 has such a volume that the pressure inside the gas storage chamber 6 becomes maximum immediately before the fault current disappears. That is, as shown in FIG. 6, the volume of the gas storage chamber 6 is such that high-pressure gas in the gas storage chamber 6 flows back from the gas storage chamber 6 into the narrow tube-shaped shut-off portion 4 vigorously near the fault current zero point P1. Designed for Thus, when the fault current becomes weak enough to blow out the arc, the high-pressure gas can be caused to flow back into the thin-tube interrupting section 4.

The pressure release mechanism 7 is provided with a tip 4b
It is provided in. FIG. 2 shows the operation principle of the pressure release mechanism 7. In the pressure release mechanism 7 shown in FIG. 2, when the gas pressure in the narrow tubular blocking section 4 exceeds a certain pressure value, the high-pressure gas expands the pressure release spring 14, pushes down the cap 20, opens the port 8, and releases the pressure. Further, the pressure-releasing spring 14 is disposed inside the narrow tube-shaped cut-off portion 4 in order to avoid the thermal effect of the radiant heat of the arc jet emitted from the intermediate horn 5 and the external environment.

The arc extinguishing device 1 includes flashing display means 10. The flash display means 10 is discolored or deformed by the radiant heat of the arc, and is attached near the pressure release mechanism 7 or the intermediate horn 5. For example, in the case of FIG. 2, a flash display panel 10 whose surface is coated with a paint that changes color by the radiant heat of the arc is attached near the pressure release mechanism 7. At the time of pressure release, high-temperature gas is released.
The color of the surface coating changes color, and the operating status can be checked. Further, a shielding wall 10a is formed on the edge of the flashlight display panel 10 on the side of the insulator string 11, so that no gap is formed on the insulator string 11 side even when the cap 20 is pushed down. (FIG. 2B). For this reason,
The high-pressure gas is not released toward the insulator string 11 side, so that the insulator or the like can be prevented from being adversely affected by heat of the high-pressure gas. Instead of the flash display panel 10 whose surface is coated with a paint that changes color due to the radiant heat of the arc, a flash display panel 10 having a label or seal attached to the surface that changes color by the radiant heat of the arc is used. May be. Also,
The flash display panel 10 that is scorched or discolored by the radiant heat of the arc without applying a special paint or a label or a seal that discolors by the radiant heat of the arc to the surface of the flash display panel 10.
May be used. Further, the flash display panel 10 which is deformed by the radiant heat of the arc may be attached, and the operation status may be confirmed based on the shape of the flash display panel 10. Further, the flashing display panel 10 may be attached near the intermediate horn 5 so as to be discolored or deformed by the heat of the arc generated between the intermediate horn 5 and the line-side arc horn 3.

The structures of the pressure release mechanism 7 and the flashing display means 10 are not limited to those shown in FIG. For example, it may be configured as shown in FIG. That is, the pressure releasing mechanism 7 is configured such that the cap 20 is attached to the thin tube-shaped blocking portion 4 by the attachment 15 with the spring mechanism.
Attached to. The attachment 15 with a spring mechanism urges the cap 20 in a direction to close the port 8. Therefore, normally, the cap 20 closes the port 8 (FIG. 3A). When the pressure inside the thin-tube-shaped blocking section 4 becomes higher than a certain pressure value from this state, the cap 20 is pushed out by this pressure, the port 8 is opened, and the pressure is released (FIG.
(B)). After the pressure is released, the cap 20 is returned to the original position by the attachment 15 with the spring mechanism, and the port 8 is closed (FIG. 3C). On the other hand, the flash display means 10 is constituted by a flash display panel 10 which is moved by the pressure of the high-pressure gas.
The flash display panel 10 is mounted near the pressure release mechanism 7 or the intermediate horn 5. One end of the flashing display plate 10 is attached to the fixture 15, but is not linked to the spring mechanism, and the other end is attached to the thin tube-shaped blocking portion 4 beyond the cap 20 by the locking member 23. Therefore,
When the pressure release by the pressure release mechanism 7 is not performed, the flash display panel 10 is superimposed on the cap 20 by the locking member 23 (FIG. 3A). When the pressure is released from this state, the locking member 23 is disengaged from the thin tube-shaped blocking portion 4 and the flashing display panel 10 is pushed away together with the cap 20 (FIG. 3).
(B)). That is, the flash display panel 10 moves. And
After the pressure is released, the cap 20 returns to the original position by the attachment 15 with the spring mechanism, but the flashing display plate 10 remains in a hanging state (FIG. 3C). That is, the flash display panel 1
The worker under the tower can check the operation status based on the fact that the 0 has moved to the hanging position. Note that the flash display panel 10 may be deformed by the radiant heat or pressure of the arc so that an operator under the steel tower can check the operation status by this deformation.

In the examples shown in FIGS. 4 and 5, the arc extinguishing device 1 is attached to the arc horn of the conductor suspension insulator device as the conductor supporting insulator device.
Has been applied. This conductor suspension insulator device has, for example, 22
The ground-side arc horn 2 is attached to the upper end of the insulator string 11 by a fixture 12 to support an overhead line of up to 77 kV. In addition, the track side arc horn 3
Suspension clamp 1 supporting wire 16 at the lower end of insulator string 11
It is attached together with 7. The thin tube-shaped cut-off portion 4 of the arc extinguishing device 1 is attached to the tip of the ground-side arc horn 2, and the tip 5 a of the intermediate horn 5 is connected to the line-side arc horn 3.
Is opposed to the tip 3a. Further, the pressure release mechanism 7 is arranged in a space sufficiently distant from the electric wire 16, the arc horns 2, 3 and the insulator string 11. Therefore, port 8
The electric wire 16 and the like are not adversely affected by the heat of the released high-pressure gas. This conductor suspension insulator device
It is attached to a steel tower (not shown) by a steel tower mounting 18.

Reference numeral 21 in FIG. 1 denotes a horn fixture, and the tip 2a of the ground-side arc horn 2 is
It is fixed to. The horn fixing member 21 is, for example, a cross-shaped plate material, so that gas can pass between the horn fixing members 21. Reference numeral 22 denotes a strength member that prevents the base end 4a from being damaged by the pressure of the high-pressure gas.

The arc extinguishing device 1 extinguishes an arc as follows. The arc-extinguishing device 1 uses a decomposition gas (high-pressure gas) generated by an arc generated in the thin-tube-shaped interrupting section 4 and its pressure to increase the arc-extinguishing force in the narrow-tube-shaped interrupting section 4. At the same time as being released outside, it is stored in the gas storage chamber 6. Since the fault current is alternating current, the fault current goes to zero twice during one cycle. Since the volume of the gas storage chamber 6 is determined so that the pressure in the gas storage chamber 6 becomes maximum near the fault current zero point P1, the decomposed gas stored in the gas storage chamber 6 is stored in the narrow tube-shaped cutoff section 4. The arc is blown out by reverse flow (reverse injection) toward it, improving the insulation recovery performance after the arc is extinguished.

That is, when a fault current flows due to lightning damage or the like, the tip 2 of the ground-side arc horn 2
a and the base end 5b of the intermediate horn 5 are flashed to generate an arc shown by oblique lines in the figure (FIG. 7A). The position (stagnation point) P2 at which the pressure becomes maximum at this time is the axial center position of the thin-tube interrupting portion 4 as shown in FIG. 7B. After the pressure in the capillary-shaped cut-off section 4 reaches a certain value or more, the pressure release mechanism 7 operates to open the port 8 and release the pressure to the outside of the capillary-shaped cut-off section 4. Note that in this state, the pressure difference ΔP between the inside of the narrow tube-shaped blocking section 4 and the inside of the gas storage chamber 6 is obtained.

Thereafter, as shown in FIG. 8, as the arc current increases, the pressure rise also increases, but this pressure is released to the outside of the thin tube type cut-off section 4 through the pressure release mechanism 7 and at the same time, the gas is released. It is also stored in the storage room 6 (FIG. 8)
(A), the stagnation point P2 shifts from the axial center position of the narrow tubular blocking part 4 toward the gas storage chamber 6 (FIG. 8).
(B)).

Then, in the state shown in FIG. 9, the stagnation point P2 reaches the vicinity of the outlet of the gas storage chamber 6, and the maximum pressure in the narrow tube-shaped shut-off portion 4 and the pressure in the gas storage chamber 6 become equal (FIG. 9).
(B)). At this time, the pressure in the gas storage chamber 6 is at a maximum. Further, since the port 8 of the pressure release mechanism 7 is open, a pressure gradient is generated in the narrow tube-shaped blocking portion 4. Furthermore, since the current is near the fault current zero point P1, the fault current is decreasing, and the arc indicated by the dotted line in the figure has a small cross-sectional area and is sufficiently weakened.

Therefore, as shown in FIG. 10, the high-pressure gas in the gas storage chamber 6 flows back into the narrow tube-shaped shut-off portion 4 to blow out the arc. At this time, since the fault current is reduced and the arc cross-sectional area is reduced as described above, the insulating gas (high-pressure gas) that has flowed backward from the gas storage chamber 6 into the capillary-shaped shut-off portion 4 reliably blows out the arc. Can be done. And
This insulating gas passes through the capillary-shaped cut-off section 4 and the pressure release mechanism 7
Flows out of the port 8 at the outside. That is, high-pressure gas is released. Since the volume of the gas storage chamber 6 is designed so that the gas in the gas storage chamber 6 flows backward near the fault current zero point P1,
It can withstand a high transient recovery voltage applied after the interruption of the fault current, and maintain the dielectric strength in which the tip 2a of the ground-side arc horn 2 and the base end 5b of the intermediate horn 5 in the thin-tube interrupting section 4 do not flash again. Since the fault current is alternating current and goes to the fault current zero point twice during one cycle, the arc is surely blown out within half a cycle of the fault current (based on the commercial frequency of 50 or 60 Hz). be able to.

Further, the material, thickness, inner diameter and gap length of the thin-tube type interrupting portion 4 are determined so that a large number of single-wire ground currents and short-circuit currents can be interrupted, and the thickness of the intermediate horn 5 is determined. Therefore, there is no need to replace the thin-tube type interrupting section with one fault current, and repeated use is possible.

After the arc has been blown out and the insulation performance has been restored, when the pressure in the thin-tube type interrupting portion 4 decreases due to the discharge of the insulating gas, the port 8 of the pressure release mechanism 7 closes. It is sealed and can prevent moisture, moisture, dust and the like from entering from the outside. When the pressure release mechanism 7 is activated, the flashing display panel 10 of FIG. 2 is discolored and the flashing display panel 10 of FIG. 3 is moved. can do.

As described above, since the one-line ground fault current and the short-circuit current flowing through the arc horn at the time of lightning damage are enclosed as arcs in the thin-tube type interruption portion, and the self-powered type is used to interrupt by utilizing the thermal effect of the arc, It is smaller and less expensive than switches and circuit breakers.

Further, since the one-line ground fault current and the short-circuit current can be cut off many times, the number of inspections of the overhead line can be reduced, and the maintenance cost of the overhead line equipment can be reduced.

Further, since it is possible to prevent the operation of the circuit breaker at the substation at the time of lightning damage, it is effective for a measure against a power failure and a measure against a momentary voltage drop, and stable power can be supplied.

The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this embodiment, and various modifications can be made without departing from the gist of the present invention. For example, as shown in FIGS. 11 and 12, the arc extinguishing device 1 may be applied to an arc horn of a conductor tension insulator device. This conductor tension insulator device supports, for example, an overhead line of 22 to 77 kV, and a ground-side arc horn 2.
Is attached to one end of the insulator string 11 by a fixture 12. The line-side arc horn 3 is attached to the other end of the insulator string 11 together with a tension clamp 19 that supports the electric wire 16. The thin-tube type cut-off portion 4 of the arc extinguishing device 1 is attached to the tip 2a of the ground-side arc horn 2, and the tip 5a of the intermediate horn 5 is connected to the tip 3a of the line-side arc horn 3.
Facing. Further, the port 8 of the pressure release mechanism 7 is arranged toward a space where there is no electric wire 16, each of the arc horns 2, 3 and the insulator string 11. This conductor tension insulator device is attached to a steel tower (not shown) by a steel tower mounting 18.

Further, in the above description, the thin tube-shaped breaking portion 4 is attached to only the ground-side arc horn 2, but may be attached to only the line-side arc horn 3 instead of the ground-side arc horn 2, or It may be attached to both the side arc horn 2 and the track side arc horn 3.

[0039]

As described above, in the arc horn arc extinguishing device according to the first aspect, the thin tube-shaped cutoff portion is attached to at least one end of the line side arc horn and the ground side arc horn, Attach an intermediate horn facing the arc horn whose tip is opposite to the cut-off part so that an arc due to fault current is generated between the base end of the intermediate horn of the thin-tube cut-off part and the tip of the arc horn fitted with the thin-tube cut-off part. The high-pressure gas generated in the narrow tube-shaped cut-off portion by the arc is caused to flow into the gas storage chamber, and when the pressure in the narrow-tube-shaped cut-off portion becomes larger than a predetermined value, the port of the pressure release mechanism is opened to open the high-pressure gas in the narrow-tube-shaped cut-off portion. And discharges high-pressure gas from the gas storage chamber back into the narrow tubular cut-off section to blow out the arc within half a cycle. 1 line ground fault current and short-circuit current generated over emissions can be reliably blocked within half cycle. For this reason, the circuit breaker of the substation is not operated, the reclosing operation of the circuit breaker can be omitted, and the power can be stably supplied even during a lightning storm or the like.

Further, in the arc horn extinguishing device according to the second aspect, the gas storage chamber has a volume in which the pressure in the gas storage chamber becomes maximum immediately before the fault current disappears, and the arc can be blown out. Since the high-pressure gas is caused to flow back into the capillary-shaped cut-off portion when the fault current becomes weak to the extent, the arc can be extinguished more reliably.

Further, in the arc horn extinguishing device according to the third aspect, since the pressure release mechanism closes the port after discharging the high-pressure gas blown out of the arc, it is possible to prevent moisture from entering into the narrow tubular cutoff after arc extinguishing. The durability can be improved by preventing the intrusion of moisture, dust, and the like, and at the same time, repetitive use is possible, which facilitates maintenance and inspection of the overhead line.

In the arc extinction device for an arc horn according to the fourth aspect, since the outer surface of the narrow tube-shaped interrupting portion is provided with irregularities for increasing the creepage distance, the line side passes through the outer surface of the narrow tube-shaped interrupting portion. Flashover between the arc horn and the ground side arc horn can be prevented.

Furthermore, in the arc horn extinguishing device according to the fifth aspect, flashing display means that is discolored or deformed by the radiant heat of the arc is attached near the pressure release mechanism or the intermediate horn. In the arc extinguishing device of the described arc horn, the flashing display means that moves or deforms due to the pressure of the high-pressure gas is attached near the pressure release mechanism or the intermediate horn, so whether or not the arc extinguishing device has operated is determined under the steel tower. The operator can easily discriminate and maintenance and inspection become easier.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an arc extinction device for an arc horn according to the present invention, and showing an example in which the arc horn is attached to a tip of a ground side arc horn.

FIGS. 2A and 2B are diagrams for explaining the operation of the pressure release mechanism and the flashing display means, wherein FIG. 2A is a cross-sectional view showing a normal state in which the pressure release mechanism is not operated, and FIG. It is sectional drawing which shows the state at the time of operation | movement which operates.

3A and 3B are views for explaining the operation of another example of the pressure release mechanism and the flashing display means, and FIG. 3A is a cross-sectional view showing a normal state in which the pressure release mechanism is not operated, and FIG. FIG. 4 is a cross-sectional view illustrating a state during operation of the pressure release mechanism, and FIG. 4C is a cross-sectional view illustrating a state after the operation after the pressure release mechanism is operated.

FIG. 4 is a front view of a conductor suspension insulator device to which the arc horn extinguishing device of the present invention is applied.

FIG. 5 is a side view of a conductor suspension insulator device to which the arc horn extinguishing device of the present invention is applied.

FIG. 6 is an oscillogram showing an example of a relationship among a fault current, an arc voltage, and a pressure in a gas storage chamber when the arc extinction device of the arc horn of the present invention is operated.

7A and 7B show the operation principle of the arc extinguishing device of the arc horn according to the present invention, wherein FIG. 7A is a schematic configuration diagram showing a state of the arc extinguishing device immediately after an arc is generated, and FIG. It is explanatory drawing which shows the pressure distribution in a thin-tube interruption | blocking part.

8A and 8B show the operation principle of the arc horn arc extinguishing device of the present invention, wherein FIG. 8A is a schematic configuration diagram showing a state following FIG. 7A, and FIG. It is explanatory drawing which shows the pressure distribution in a part.

9A and 9B show the operating principle of the arc extinction device for an arc horn according to the present invention, wherein FIG. 9A is a schematic configuration diagram showing a state following FIG. 8A, and FIG. It is explanatory drawing which shows the pressure distribution in a part.

10A and 10B show the operation principle of the arc horn arc extinguishing device of the present invention, wherein FIG. 10A is a schematic configuration diagram showing a state following FIG. 9A, and FIG. It is explanatory drawing which shows the pressure distribution in a part.

FIG. 11 is a front view of a conductor tension insulator device to which the arc horn extinguishing device of the present invention is applied.

FIG. 12 is a side view of a conductor tension insulator device to which the arc horn extinguishing device of the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Arc-extinguishing device of arc horn 2 Ground-side arc horn 3 Line-side arc horn 4 Capillary cut-off part 5 Intermediate horn 6 Gas storage room 7 Pressure relief mechanism 8 Port 9 Irregularity 10 Flashing display board (flashing display means) 11 Insulator And horn insulator 12 Ground-side arc horn fitting 13 Cap for preventing fall of thin tube-shaped cut-off part 14 Spring for pressure relief 15 Fixture with spring mechanism 16 Electric wire 17 Suspension clamp 18 Steel tower fixture 19 Tension clamp 20 Cap for pressure relief 21 Ground-side arc Horn Fixing Device 22 Gas Storage Room Reinforcement Member Flashing Device Locking Device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Takashi Chino 2-6-1 Nagasaka, Yokosuka City, Kanagawa Prefecture, Japan Yokosuka Research Institute, Central Research Institute of Electric Power Industry (72) Kazuhiko Shimoda 3-chome Nakanoshima, Kita-ku, Osaka-shi, Osaka No. 3-22 Kansai Electric Power Co., Inc. (72) Hiroki Sakamoto 13-1, Isojima Minamicho, Hirakata-shi, Osaka F-term (Reference) 5G331 AA01 AA02 BA03 BB27 BB32 BC16 DA02 EB02

Claims (6)

[Claims] 1. A method according to claim 1, further comprising: attaching a thin tube-shaped cut-off portion to at least one end of the line-side arc horn and the ground-side arc horn; and attaching an intermediate horn whose tip is directed to the arc horn whose tip is opposed to the thin tube cut-off portion. An arc due to a fault current is generated between the base end of the intermediate horn of the thin tube-shaped cut-off portion and the tip of the arc horn to which the thin tube-shaped cut-off portion is attached. While the gas flows into the storage chamber, when the pressure in the capillary-shaped cut-off section becomes larger than a predetermined value, the port of the pressure release mechanism is opened to discharge the high-pressure gas in the capillary-shaped cut-off section, and the high-pressure gas is discharged from the gas storage chamber to the gas storage chamber. An arc horn extinguishing device, characterized in that the arc is blown out within a half cycle by flowing back into a narrow tubular cut-off portion. 2. The gas storage chamber has a volume in which the pressure in the gas storage chamber is maximized immediately before the fault current disappears,
2. The arc extinction device for an arc horn according to claim 1, wherein the high-pressure gas is caused to flow back into the capillary-shaped cut-off portion when the fault current becomes weak enough to blow out the arc. 3. The arc horn extinguishing device according to claim 1, wherein the pressure releasing mechanism closes the port after discharging the high-pressure gas blown out of the arc. 4. The arc-extinguishing device for an arc horn according to claim 1, wherein the outer surface of the narrow tubular blocking portion is provided with irregularities for increasing a creeping distance. 5. An arc horn according to claim 1, wherein flashing display means for discoloring or deforming due to the radiant heat of the arc is mounted near the pressure release mechanism or the intermediate horn. Arc device. 6. An arc horn according to claim 1, wherein flashing display means which moves or deforms due to the pressure of said high pressure gas is mounted near said pressure release mechanism or intermediate horn. Arc extinguishing device.