JPH04135193U - Archhorn flash indicator - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a flash fault indicator for an arc horn that has a reliable indicating operation during a flash fault, allows easy confirmation of the occurrence of arc discharge, and can be used repeatedly. . [Structure] When the arc horn 6 is struck by lightning, the pin 5 made of a shape memory alloy is heated by the heat of the arc discharge.
Restore to the memorized linear shape. Then, the pin 5 comes off from the metal fitting 4 and the gripping spring member 3 comes off from the arc horn 6. As a result, the gripping spring member 3 is moved to a position away from the arc horn 6 by the elastic force of the separating spring member 2 and maintained in this state.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is designed to prevent arcing between arcing horns when a lightning strike or reverse flash fault occurs on a power transmission line. When a flash discharge phenomenon occurs, it is displayed to make it easier to find the flash fault location. Regarding Kuhorn's flash indicator, the visibility of the indicator is improved by using shape memory alloy. Regarding the flash indicator.

0002

[Conventional technology]

Arc horns cause flashovers when shock voltage is applied due to lightning strikes. They are installed to protect equipment such as power transmission lines and insulators. So If an arc discharge occurs between the arc horns due to a lightning strike or reverse flash circuit, etc. , locate the location where the arc discharge occurred, and locate the location where the arc discharge occurred on the power transmission line or It is necessary to promptly inspect the component equipment for damage or other adverse effects. There is a point.

0003 Conventional technology that makes it easier to detect whether arc discharge has occurred between arc horns For example, Utility Model Publication No. 42-1091 has been proposed. In this conventional technology , a bulge is provided near the tip of the arc horn, and the heat generated by the arc discharge By visually checking whether the bulge has melted and disappeared, the arc horn can be detected. Determine whether or not arc discharge occurs between the two.

0004

[Problem that the idea aims to solve]

However, in the arc horn flash indicator technology described above, Because it is assumed that the bulge provided near the tip of the tube will melt, By shutting down the power transmission lines and distribution lines in a short time when an occurrence occurs, This contradicts the technology that attempts to ensure the integrity of the power distribution line. In other words, lightning strikes If the circuit is interrupted within a few hertz, the bulge of the arcing horn will disappear. The melting loss does not progress until it reaches the point where the Therefore, the scale of the flash is small and the arc horn is damaged. If the scratches are minor, only traces of arc discharge are visible. stop Since the arc horn is installed at a high place, it can be seen with binoculars etc. The problem is that it is difficult to confirm whether arc discharge has occurred even by observing the tip. There is an issue. For this reason, components of power transmission lines, such as insulators, may be damaged by arc discharge. When inspecting whether a secondary disaster has occurred such as a rack, identify the location where arc discharge has occurred. It is difficult to identify and requires a great deal of effort to inspect.

[0005] The present invention has been developed in view of the above problems, and is designed to ensure that the indicator operates in the event of a flash fault. The presence or absence of arc discharge can be easily confirmed using the actual product, and the product can be used repeatedly. It is an object of the present invention to provide a flash flash indicator for an arc horn that can be used for various purposes.

[0006]

[Means to solve the problem]

The arc horn flash indicator according to the present invention has a base fixed to the arc horn. , one end of which is fixed to the base and the other end separated from the arc horn by elastic force. a marking member that is biased in a direction to an engaging member capable of engaging the arc horn, and the engaging member is connected to the The arc horn is held in the engaged state, and the engagement portion is restored by receiving heat from arc discharge. and a shape memory alloy member that brings the arc horn into a released state. shall be.

[0007]

[Effect]

In the present invention, the shape memory alloy member is engaged under the normal temperature of the flash flash indicator. The member maintains a first position in engagement with the arcing horn. This provides elasticity. The indicator member is located along the arc horn between the base of the flash indicator and the engaging member. is fixed. On the other hand, when arc discharge occurs, the heat is transferred to the shape memory The shape memory alloy member is transmitted to the metal member, and this shape memory alloy member is Restores to the second posture to release. Then, the engaging member is attached to the arc horn. The engagement is released, whereby the indicator member is separated from the arc horn by elastic force. separate This marking member can be made in a size or shape with good visibility, so The separation of the marking member from the arc horn can be confirmed from a distance with the naked eye or with binoculars. This can be easily confirmed, and therefore the occurrence of a lightning strike can be easily detected. In addition, since the engagement member and indicator member remain in their original state, arc discharge does not occur. The indicating member continues to indicate the occurrence of arc discharge even after a period of time has elapsed since then. others Therefore, the presence or absence of flash faults between arc horns can be investigated at any time. In addition, the shape memory alloy member simply maintains the state in which the engaging member is engaged with the arc horn. It suffices if it can be held in place, and it can be made into a small structure such as a pin. Therefore, its heat capacity can be made extremely small. For this reason, the flash Even if the scale is small and the degree of temperature rise of the arc horn is relatively small, the above Since the pin returns to the second posture of its memorized shape, even such small-scale flash faults can be reliably avoided. Can be detected. Furthermore, the device of this invention utilizes heat generated by arc discharge. Therefore, no special energy source is required to heat the shape memory alloy parts. In both cases, as mentioned above, since the structure is simple, shape memory alloy members such as pins are used. It can be used repeatedly by reinstalling it, and can also be used with existing arc horns. It is also easy to apply.

[0008]

【Example】

Next, embodiments of the present invention will be described with reference to the accompanying drawings.

[0009] FIG. 1 is a perspective view showing a flash flash indicator for an arc horn according to an embodiment of the present invention, and FIG. FIG.

0010 The arc horn 6 is bent near its base end and near its tip. It is composed of straight parts on the side, the center, and the tip side.

[0011] The fixing member 1, which is the base member of this device, is a bolt that grips the arc horn 6. Attach to the straight part of the proximal end of the arc horn 6 using fasteners such as bolts and nuts. It is being The spacing spring member 2 as a marking member is composed of a plate spring or the like. Then, one end of the arc horn 6 is directed toward the tip of the arc horn 6, and the other end is fixed to the fixing member 1. has been done. In addition, as shown by the broken line in FIG. 1, the spacing spring member 2 is The arc horn 6 is set so that one end thereof is always biased in a direction away from the arc horn 6. ing.

0012 A grip made of a coil spring or the like is provided at one end of the spacing spring member 2 as an engaging member. A holding spring member 3 is connected. No external force acts on this gripping spring member 3. In this case, it has a linear shape (indicated by a broken line in the figure), and the arc horn 6 has a straight shape (indicated by a broken line in the figure). If it is engaged so as to surround the surrounding area, release this engagement state and make it straight. It will be elastically biased in the direction that it moves. Moreover, both ends of this gripping spring member 3 A pair of metal fittings 4 are attached to the metal fittings 4, and these metal fittings 4 are connected when they form a pair. A hole (not shown) is provided through which the hole can be inserted.

[0013] The pin 5 made of shape memory alloy has a linear shape memorized and can be moved to a predetermined position. When the temperature reaches a temperature higher than the transformation temperature, the memory shape (high temperature phase) is restored. this pin 5 is attached to the gripping spring member 3 in the following manner. First, the gripping spring member 3 against its own elastic force and the elastic force of the spacing spring member 2, the arc horn Wrap it around the tip of the central straight portion of No.6. At this time, the metal fitting 4 has the holes connected to each other. Butt them so that they are touching. Then, place this pin 5 in a low temperature state such as room temperature. After inserting the metal fittings 4 into the connecting holes of the pair of metal fittings 4, remove both ends protruding from the metal fittings 4. Bend in the direction perpendicular to. As a result, the pair of metal fittings 4 are connected to each other via the pin 5. The gripping spring member 3 surrounds the arc horn 6 and engages the arc horn 6. It will be in a combined state.

[0014] Figure 3 shows the above-mentioned embodiment of the arc horn installed in the tension insulator of the power transmission line. A schematic diagram showing the case where the device is installed, FIG. 4 is a view taken along the line A-A.

[0015] A tension insulator chain 7 consisting of a plurality of tension insulators has a track side seam connected to both ends of the tension insulator chain 7. It is pulled in its length direction by the shield ring 8a and the ground side shield ring 8b. There is. These shield rings 8a and 8b have a U-shaped ring part and a tensile insulator chain 7 connected to each other. and a connecting portion that connects the ring portion and the connecting portion. There is. The arc horns 6a and 6b are connected to shield rings 8a and 8b, respectively. The apparatus of this embodiment is installed near the connection point between the connection part and the connection part. It is installed appropriately.

[0016] In the arc horn flash fault indicator configured as described above, lightning strikes or reverse flash faults When arc discharge occurs between arc horns 6a and 6b, this arc discharge The vicinity of the tip of the line-side arc horn 6a or the ground-side arc horn 6b is temporarily damaged due to heat. The pin 5 made of shape memory alloy is heated by the heat conduction. . In this case, since pin 5 has a relatively small volume, if the scale of flash flash is relatively small, However, it heats up well throughout. The piston heated by this heat conduction When the temperature of the tube 5 reaches the transformation temperature or higher of the shape memory alloy that constitutes it, the It instantaneously restores the memory shape of the high temperature phase, that is, the linear shape shown by the broken line in FIG. So When the pin 5 is pulled out of the hole in the metal fitting 4, the connection is released and the grip is removed. The holding spring member 3 becomes free and the gripping force on the arc horns 6a, 6b decreases. Therefore, the gripping spring member 3 releases the engagement of the arc horns 6a, 6b. to this Therefore, the gripping spring member 3 is moved by the elastic force of the separating spring member 2 to hold the arc horn 6a. , 6b and maintain this state. At this time, the gripping spring The member 3 is located at a position clearly separated from the arc horns 6a and 6b. In addition, its shape is deformed into an open straight line. For this reason, lightning strikes or reverse flash Due to an accident, arc discharge occurred between the arc horns 6a and 6b, which caused the separation. The holding spring member 2 and the gripping spring member 3 are separated from the arc horns 6a and 6b. clearly marked.

[0017] Therefore, according to the device of this embodiment, it is possible to Even if the gripping spring member 3 Therefore, the condition of the separation spring member 2 from the ground can be easily confirmed with the naked eye or with binoculars, etc. be able to. This determines whether or not a flashover occurs between the arc horns 6a and 6b. can be investigated at any time. In addition, the pin 5 made of a shape memory alloy is a thin wire, etc. If you configure it with It can be made small. For this reason, the scale of the flash is small and the arc horn is small. Even if the degree of temperature rise at 6a and 6b is relatively small, pin 5 can easily remember the temperature rise. Since it restores its shape, even small-scale flash faults can be reliably detected. Furthermore, the truth As mentioned above, the device of this embodiment has a simple structure, so it is not necessary to reinstall the pin 5. It can be used repeatedly and can also be applied to existing arc horns. It's easy.

[0018]

[Effect of the idea]

As explained above, according to the present invention, the engaging member is arched by the shape memory alloy member. By engaging with the arch horn, the indicating member is moved to the arc horn against its elastic force. Due to the heat of the arc discharge that occurs during lightning strikes or reverse flash faults, Since the shape memory alloy member is transformed to release the engagement state of the engagement member, the target A flashover between the arc horns can be detected depending on the state of the indicator member. Also, the shape Shape memory alloy components can be of small structure, reducing their heat capacity. Therefore, even small-scale flash faults can be reliably detected. Furthermore, the said mark Since the indicator member is held as it is in a position away from the arc horn, flash sparks are prevented. It is possible to continuously indicate the occurrence of problems, and to easily investigate this at any time. can.

[0019] The device of this invention does not require any special energy source and has a simple structure. Therefore, it is easy to apply to existing electric cables and can be used repeatedly. It also has the advantage of being able to.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a flash flash indicator of an arc horn according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a flash flash indicator of an arc horn according to an embodiment of the present invention.

FIG. 3 is a schematic diagram showing a case where the device of this embodiment is attached to an arc horn included in a tension insulator of a power transmission line.

FIG. 4 is a view taken along line AA in FIG. 3;

[Explanation of symbols]

1; Fixed member 2; Separation spring member 3; Gripping spring member 4; Metal fittings 5; pin 6, 6a, 6b; arc horn 7; Tensile insulators 8a, 8b; Shield ring

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Yasuo Kojima Fujikura Den, 1-5-1 Kiba, Koto-ku, Tokyo Within Line Co., Ltd. (72) Creator Akifumi Onishi Fujikura Den, 1-5-1 Kiba, Koto-ku, Tokyo Within Line Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A base member fixed to an arc horn; an indicator member having one end fixed to the base member and the other end biased in a direction away from the arc horn by an elastic force; an engaging member attached to the other end and capable of engaging the arcing horn; and an engaging member that maintains the engaging member in an engaged state with the arcing horn under normal temperatures and recovers after receiving heat from arc discharge. A flashover indicator for an arc horn, comprising a shape memory alloy member that causes the engagement member to release the arc horn.