JP2538029Y2 - Lightning arrester with disconnecting device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning arrester with a disconnecting device.

[0002]

2. Description of the Related Art A lightning arrester connected between a charged part of a distribution line or the like and the ground to protect electrical equipment from abnormal voltage such as a lightning surge generally has a low resistance when a high voltage such as a lightning surge is applied.
An element having a voltage-current characteristic of completely interrupting a normal ground voltage such as a distribution line, for example, zinc oxide (ZnO) is used as a characteristic element.

However, if the characteristic element receives a lightning surge many times or a surge greatly exceeding the rating, the voltage-current characteristic is deteriorated.

[0004] Due to the deterioration of the characteristic elements, the leakage current gradually increases, and if the energy during the lightning surge absorbing operation becomes excessive, the element starts to generate heat, and eventually the short circuit is destroyed due to thermal runaway, resulting in a ground fault. Occurs. Then, a relay or the like of a circuit to which the lightning arrester is connected is operated to have a great effect on the power system.

In order to prevent such an accident, the applicant of the present invention has proposed a separating apparatus S as shown in FIG.
No.-208581), as shown in FIG. 3a or 3b, together with the surge arrester A, is connected between the charging part 1 such as a distribution line and the ground 2.

[0006] This separating device S uses a conductive plastic 3 having a conductivity selected so as to melt when the temperature rises to a predetermined value and to function as a heating resistor as a terminal holder, and a pair of terminals fixed to both ends thereof. A discharge gap G is formed between the metal terminals 4 and 4.

When an abnormal voltage such as a lightning surge is generated in the charging unit 1, the disconnecting device S releases the abnormal voltage to the ground 2 through the discharge gap G and the lightning arrester A. Also, lightning arrester A
When the leakage current is increased due to deterioration of the power supply and when the lightning arrester A is short-circuited, the upper and lower metal terminals 4 and 4 are separated by the self-heating, and the grounding to the power system circuit is performed by such an operation. It is intended to prevent a tangling abnormality.

However, the disconnecting device S has a problem that, when the conductive plastic 3 is blown due to deterioration of the lightning arrester A or the like, the arc generated at the fusing point is difficult to extinguish. That is, since the ground voltage of the charging unit 1 such as a distribution line is as high as several thousand volts, the cut ends of the blown conductive plastic 3 need to be separated by, for example, 30 mm or more for arc extinction, while the separated metal terminals are separated. 4, 4 are supported by a thick electric wire connected to them, and are usually separated by a small distance due to their own weight. If the continuation current is not cut off in this way, it is necessary to perform a return operation at the substation, and there is no point in using the disconnecting device S.

[0009]

Therefore, according to a subsequent study, the present applicant has proposed a new disconnecting device S for solving the above-mentioned problem, when the conductive plastic is blown off due to a failure of the lightning arrester A, and the following flow is generated. Japanese Patent Laid-Open
A separating device as disclosed in Japanese Patent Application Laid-Open No. 2-117083 and Japanese Patent Application Laid-Open No. 2-117084 has been proposed.

The basic structure of this new separating device S is, for example, as shown in FIG. 4, a conductive material having a conductivity selected so as to melt when the temperature rises to a predetermined value and to function as a heating resistor. The plastic 3A is formed into a rod shape, and the metal terminals 4A, 4A are fixed to both ends of the conductive plastic 3A, while the outer periphery of the conductive plastic 3A is first and second.
(FIG. 4a), or a structure having both ends of a conductive plastic 3A having the function of a metal terminal 4A in place of the metal terminal 4A (FIG. 4b).
It is.

Further, although not shown, the lightning arrester A
When the conductive plastic 3A is blown and separated due to deterioration of the cable, a means (tension spring, etc.) for forcibly separating one of the cut ends from the other by a predetermined distance is provided, and the fact that the cut is separated is notified. There is also a configuration having means.

The disconnecting device S configured as described above is used to connect the lightning arrester A to the charging section 1 such as a distribution line or the ground 2.
It is used near the surge arrester A or directly connected to the surge arrester A, and when the conductive plastic 3A is blown out due to a failure of the lightning arrester A, the arc at the time of the blowout is surely extinguished by the action of the arc-extinguishing resins 5, 6. On the other hand, one of the cut ends is forcibly separated from the other by a predetermined distance, so that the following flow can be reliably shut off.

As described above, the disconnecting devices disclosed in Japanese Patent Application Laid-Open Nos. 2-117083 and 2-117084 can be used in the vicinity of the lightning arrester A or directly connected to the lightning arrester A to use the conductive plastic. When 3A is blown due to lightning arrester A failure, the arc at the time of blowing is surely turned off,
Although the present invention has the effect of reliably blocking the downstream current, the present applicant further studied in the course of the development of the lightning arrester A that can be incorporated between the distribution lines at a narrow interval. As a structure directly attached to the lightning arrestor, a lightning arrester with a disconnecting device having the most preferable configuration has been developed and is provided here.

[0014]

The lightning arrester with a disconnecting device according to the present invention developed according to the above circumstances has a screw hole at the bottom at the outer bottom of the grounding-side metal fitting of the lightning arrester and a screw at the side wall.
Disconnecting a connecting fitting having a hole and having an L-shaped cross section
Into the protective case and screw on the side wall.
This allows the bottomed tubular separating device protective case to be
While mounting a manner, at least the display unit and a display unit for displaying that the disconnecting mechanism and the disconnect mechanism is actuated
The lightning arrester disconnection device configured to be housed in a sealed case having a transparent side formed inside the protective device protective case.
Screwed into the screw hole at the bottom of the connection fitting inserted into the part
Thus, the disconnecting mechanism is connected such that the operating direction of the disconnecting mechanism is substantially perpendicular to the axial direction of the lightning arrester.

In the lightning arrester with the disconnecting device, the lightning arrester may be configured so as to be directly attached to a distribution line.

[0016]

According to the lightning arrester with a disconnecting device of the present invention, a sealing device having a disconnecting mechanism and a display for indicating that the disconnecting mechanism has been operated has at least a transparent display portion.
The disconnecting device configured to be housed in the base is separated from the outer bottom of the grounding-side bracket of the lightning arrester and inserted into the protective case of the device.
Screw into the screw hole on the bottom of the connection fitting with the side wall screwed
The lightning arrestor is connected to the lightning arrester so that the operating direction of the lightning arrester is substantially perpendicular to the axial direction of the lightning arrester. Therefore, the space occupied by the lightning arrestor can be reduced, and the lightning arrestor can be installed in the distribution line at a small interval, and the distance between the distribution lines can be narrowed without any trouble. In addition, when the lightning arrester is used, the disconnecting device is positioned substantially horizontally, so that the display unit can be easily seen from below.

As a basic structure of the separating device incorporated in the separating mechanism, a separating device having a conductive plastic disclosed in the above-mentioned Japanese Patent Application Laid-Open No. H2-117084 can be suitably used.

In the present invention, the structure of the lightning arrester is not particularly limited, but a lightning arrester having a structure that can be directly attached to the distribution line is preferable. With this arrester, the distance between distribution lines can be made narrower. In addition, it can be easily installed between existing distribution lines at a narrow interval.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory sectional view of an arrester with a disconnecting device according to the present invention.

Reference numeral 10 denotes a lightning arrester.
A line-side metal fitting 12 and a ground-side metal fitting 13 are fitted and fixed respectively to the upper and lower ends of an RP withstand voltage insulating cylinder 11, and a non-linear element having zinc oxide (ZnO) as a characteristic element between the metal fittings 12 and 13. 14 is fixed so as to be conductive.
And both metal fittings 12 and 13 are housed in a cylindrical insulating case 16 having a plurality of folds, and a main line (distribution line)
A line-side connection fitting 15 having a structure that can be directly attached to H is connected and fixed to be conductive.

Reference numeral 20 denotes a connection fitting.
Is formed into an L-shaped cross section by a bottom portion 21 and an arc-shaped side wall portion 22. The bottom portion 21 is provided with a screw hole 23, and the side wall portion 22 is provided with a screw hole 24. In this example, the connection fitting 20 is provided together with the disconnecting device protection case 25 on the bottom surface of the ground-side fitting 13 of the lightning arrester 10 by being fixed with a countersunk screw 26. 27 is the screw hole of the protective case 25.
A hole for loading and unloading a countersunk screw 26 formed in a side wall facing 4A, and a cover 28 is provided.

Reference numeral 30 denotes a separating device.
Reference numeral 30 denotes a separating mechanism 32 housed at one end of the sealed case 31 and a display unit provided adjacent to the separating mechanism 32.
33.

The separating mechanism 32 is formed on a conductive plastic 34 of which conductivity is selected so as to melt when the temperature rises to a predetermined value and function as a heating resistor, and an intermediate outer periphery of the conductive plastic 34. The first arc-extinguishing resin 36, 37 provided on both sides of the formed annular groove 35, and can be slidably fitted to the outer periphery of the first arc-extinguishing resin 36, 37, and one end thereof has an inner side. A cylindrical second arc-extinguishing resin 39 having a flange 38 facing the other, and a hat-shaped gap metal fitting 40, which is externally fitted from both end sides of the second arc-extinguishing resin 39 and has a side surface formed in an arc shape, In order to fix them integrally, male screws at both ends of the conductive plastic 34 are provided with a lead-out fitting 42 on one side and a hexagon nut 43 on the other side. The drawer fitting 42 is fitted into the hole 44 of the sealed case 31, and the male screw part 45 at the tip is screwably mounted in the screw hole 23 of the connection fitting 20.

The display section 33 is provided between a colored display cylinder 46 fixed to one of the gap fittings 41 and a case lid 49 provided with a spring receiver 47 and a lead wire 48 formed on the outer periphery of the gap fitting 41. It is composed of a tension spring 50, a lead wire 51 provided between the gap fitting 41 and the case lid 49, and at least the sealed case 31 at this portion is formed transparent so that the inside can be seen. .

In the lightning arrester with a disconnecting device according to the present invention thus configured, the length from the line-side connection metal fitting 15 of the lightning arrester 10 to the lower surface of the sealed case 31 of the disconnecting device 30 is extremely short. The space occupied by the separating device 10 and the separating device 30 can be reduced, and it can be easily installed between the existing main lines (distribution lines) H at a narrow interval, while the distance between the main lines (distribution lines) H can be narrowed without any trouble. .

Furthermore, when this lightning arrester is used, the disconnecting device 30 is positioned substantially horizontally, so that the display unit 33 is easy to see from below, and when the conductive plastic 34 is blown off and separated due to deterioration of the lightning arrester 10, etc. The side of the cut end to which the display cylinder 46 has arrived moves to the display section 33 side by the tension spring 50, so that an abnormality of the lightning arrester 10 can be easily grasped. In addition, after the conductive plastic 34 is melted and separated, one of the cut ends (the side where the display cylinder 46 is attached) is forcibly separated by a predetermined distance by the tension spring 50, so that the subsequent flow can be reliably shut off. Can be performed safely.

In the above embodiment, the lightning arrester 10 is described as an example of a lightning arrester directly attached to a distribution line.
The present invention is not limited to this, and can also be applied to a conventionally used lightning arrester such as a lightning arrester attached to a distribution line using a lead wire.

[0028]

As described above, according to the lightning arrester with the disconnecting device according to the present invention, the space occupied by the lightning arrester and the disconnecting device can be reduced, so that the lightning arrestor and the disconnecting device can be easily installed between the existing narrowly spaced distribution lines. In addition, the distance between the distribution lines can be reduced within a range that does not cause any trouble, and since the disconnecting device is located substantially horizontally, the display unit is easy to see from below, and the abnormality of the lightning arrester can be easily grasped. In addition, when the surge arrester is abnormal, the disconnecting device reliably blocks the downstream flow, so that the subsequent treatment can be performed safely.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of an arrester with a disconnecting device according to the present invention.

FIG. 2 is a sectional view of a conventional separating device.

FIG. 3 is an explanatory view showing a state in which a conventional disconnecting device is attached to a lightning arrester.

FIG. 4 is a cross-sectional view of another example of a conventional separating device.

[Explanation of symbols]

10: Lightning arrester 11: Withstand voltage insulation tube 1
2: Track side bracket 13: Ground side bracket 14: Non-linear element 1
5: Track side connection bracket 20: Connection bracket 25: Separation device protection case 1
6: Insulating case 26: Countersunk screw 30: Separating device 3
1: Sealed case 32: Separation mechanism 33: Display 3
4: Conductive plastic 36, 37: First arc-extinguishing resin 3
9: Second arc-extinguishing resin 40, 41: Gap fitting 42: Pull-out fitting 4
3: Hex nut 46: Colored display cylinder 47: Spring receiver 4
8, 51: Lead wire 49: Case lid 50: Tension spring
H: Main line (distribution line)

Continuation of the front page (56) References JP-A-1-2677982 (JP, A) JP-A-2-1177083 (JP, A) JP-A-3-285284 (JP, A) Japanese Utility Model Application No. 58-183789 (JP) , U) Japanese Patent Publication No. 52-50628 (JP, B2)

Claims (2)

(57) [Scope of request for utility model registration] (1) A bolt is attached to the outer bottom of the grounding-side bracket of the arrester and to the bottom.
Formed in an L-shaped cross section having a screw hole
Disconnect the fitting and insert it inside the protective case.
By fixing the side wall part with screws, a bottomed tubular separating device
A sealed case in which, while the protection case is mounted with the axis horizontal , the separation mechanism and a display for indicating that the separation mechanism has been operated are formed at least on the display side transparently.
The arrester disconnecting device configured accommodated within, the switching
The bottom of the connection fitting inserted inside the release device protection case
A lightning arrester with a disconnecting device, wherein the lightning arrester with a disconnecting device is connected by being screwed into a screw hole so that the operating direction of the disconnecting mechanism is substantially perpendicular to the axial direction of the lightning arrester. 2. The lightning arrester with a disconnecting device according to claim 1, wherein said lightning arrester is a lightning arrester directly attached to a distribution line.