JPH0342646Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications This invention relates to lightning arresters.

BACKGROUND ART A lightning arrester generally includes an insulating case, a plurality of nonlinear elements arranged vertically in the insulating case, a first electrode attached to one end of the insulating case, and fixed to the first electrode. and a second terminal attached to the other end.

In the following description, for convenience, the first electrode will be described as a high voltage side electrode, the first terminal as a high voltage terminal, and the second terminal on the other end side as a ground side terminal.

That is, an insulating case made of a contractile resin or insulator whose main component is silicone rubber is used, a plurality of nonlinear elements are installed vertically within the insulating case, and a high voltage terminal is fixed to the high voltage side electrode. .

On the other hand, a ground side electrode is fixed to the insulating case on the opposite side of the high voltage side electrode.

When installing lightning arresters in series, the grounding side electrode is connected to the high voltage terminal. Therefore, these are mainly installed in power generation and substations, etc., and cannot be applied to power transmission lines. Almost impossible.

Problems that the invention aims to solve: Therefore, when lightning arresters are installed in series, the high voltage terminal is fixed to the high voltage side electrode, so it becomes like a single rod, and the individual lightning arresters It is impossible to rotate freely.

In this way, when lightning arresters are connected in series, if they are in a single rod-like state as in the conventional case, when the lightning arrester is exposed to gusts of wind, strong winds, etc., a torsional moment may act on the lightning arrester and cause it to be damaged. Further, even if the lightning arrester does not break all at once, if the above-mentioned torsional moment is applied repeatedly, the lightning arrester may suffer fatigue failure.
Therefore, both terminals must have sufficient mechanical strength, which requires a large amount of construction and cost.

This invention was devised in view of the above circumstances, and its purpose is to provide a lightning arrester that is not subjected to torsional moments. In other words, by arranging lightning arresters in series, it is possible to install them in a curved shape, which means that they will not be damaged even when exposed to gusts or strong winds, and will not cause fatigue failure. It is also possible to install it on railway lines.

Means for Solving the Problems The lightning arrester according to the present invention includes an insulating case, a plurality of nonlinear elements vertically installed in the insulating case, and a first electrode attached to one end of the insulating case. The device is characterized in that the first electrode is provided with a first terminal rotatably provided.

Function As mentioned above, in the lightning arrester of this invention, the first terminal attached to the first electrode can freely rotate with respect to the first electrode attached to one end of the insulating case, so the arrester can be connected in series. In this case, no torsional moment is applied even if an external force is applied.

Embodiment A lightning arrester using an insulating case made of a shrinkable resin whose main component is silicone rubber will be described below as an example.

FIG. 1 is a partially longitudinal cross-sectional front view of a lightning arrester according to the present invention, and FIG. 2 is a right side view of FIG. 1.

In the figure, reference numeral 10 denotes a cylindrical insulating case having a plurality of folds as shown in the drawing from the perspective of creepage distance, and this insulating case 10 covers the outermost part of the lightning arrester. The insulating case 10 is made of a shrinkable resin whose main component is silicone rubber.

20 is a cylindrical FRP material.

Reference numeral 30 denotes a silicone or epoxy adhesive, which is filled between the FRP material 20 and the non-linear element 40. This adhesive 30 also fixes the FRP material 20 to the nonlinear element 40.

Here, 40 is a cylindrical nonlinear element made of ZnO, for example, and this nonlinear element 40 is
A plurality of them are vertically arranged inside the FRP material 20.

Reference numeral 50 designates a first electrode as a high-voltage electrode formed to have a convex cross section as a whole;
As shown in the figure, it is attached to the tip of the FRP material 20 at a predetermined distance from the metal saucer portion 41 attached to the tip of the non-linear element 40. In addition,
42 is a spring interposed between the metal saucer portion 41 and the electrode 50.

Reference numeral 60 designates a high-voltage terminal as a first terminal formed with a substantially U-shaped cross section. A bolt insertion hole 61 is formed opposite to the side surface of this high-voltage terminal 60, and the electrode 50 is formed on the bottom surface. An electrode insertion hole 62 into which the tip is inserted is provided. 52 is a retainer, and the open end of the retainer 52 is press-fitted and glued into the gap between the insulating case 10 and the FRP material 20, so that the electrode 50 can be attached to the insulating case 10.
It is fixed at 51 is a disc spring inserted between the bottom surface of the high voltage terminal 60 and the top surface of the retainer 52. 6
Reference numeral 3 designates a fixing pin, and the fixing pin 63 is inserted into a small hole formed in the electrode 50 via a washer 64, thereby attaching the high voltage terminal 60 to the electrode 50 so as to be rotatable.

70 is a ground side electrode provided on the other end side;
This electrode 70 is fixed to the other end of the insulating case 10 by a retainer 71 that is substantially similar to the retainer 52 described above. Note that the electrode 70 has a rectangular cross-sectional shape, and has a bolt insertion hole 72 as shown in the figure.

FIG. 4 is a partially longitudinal cross-sectional front view of the lightning arrester connection section. Align the bolt insertion hole 72 of the lightning arrester with the bolt insertion hole 61 of the high voltage terminal 60, insert the bolt 80, and then tighten the washer 81 and nuts 82, 82.
The ground side electrode 70 and the high voltage terminal 60 are fastened together. Note that 83, 83 is a disk-shaped spacer with a bolt through hole provided in the center, and 84 is a split pin for preventing loosening.

That is, since the high voltage terminal 60 is rotatably attached to the electrode 50, each lightning arrester can freely rotate.

Effects of the invention The lightning arrester according to the invention includes an insulating case, a plurality of nonlinear elements vertically installed in the insulating case, a first electrode attached to one end of the insulating case, and a rotating first electrode. Since the first terminal is provided freely, the lightning arrester itself can be freely rotated. In other words, by arranging lightning arresters in series, it is possible to install them in a curved shape, which means that they will not be damaged even when exposed to gusts or strong winds, and will not cause fatigue failure. It is also possible to install it on railway lines.

[Brief explanation of the drawing]

Figure 1 is a partially vertical cross-sectional front view of the surge arrester, Figure 2 is a right side view of Figure 1, Figure 3 is an enlarged partial cross-sectional view of the vicinity of the high-voltage terminal of the surge arrester, and Figure 4 is a portion of the connecting part of the surge arrester. FIG. 5 is a partial plan view of the vicinity of the ground side electrode. 10...Insulating case, 40...Nonlinear element, 5
0...High voltage side electrode, 60...High voltage terminal.

Claims (1)

[Scope of utility model registration request] an insulating case, a plurality of nonlinear elements arranged vertically in the insulating case, a first electrode attached to one end side of the insulating case, and a first terminal rotatably provided on the first electrode. A lightning arrester characterized by comprising: