JP2000208308A - Deviation preventing spacer for arrester element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deviation preventing spacer which can prevent the deviation of an element for arrester, even if the element receives vibration. SOLUTION: A deviation preventing arrester is constituted, in such a way that a plurality of holding claws 11 and 12 which hold the end section of an element 2 for arrester is formed on the peripheral edge of a metallic plate 10, and the outside diameter of the plate 10 or the outside diameters of the claws 11 and 13 are made slightly smaller than the inside diameter of a porcelain insulating tube 1. The claws 11 and 12 may be formed on both surfaces or one surface of the metallic plate 10. With the spacer incorporated in an arrester, the element 2 for arrester will not deviate, even if the element 2 receives vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a displacement preventing spacer for an arrester element housed in an arrester.

[0002]

2. Description of the Related Art As shown in FIG. 6, an arrester used to protect power equipment from lightning surge has a porcelain insulator 1 in which an arrester element 2 made of ZnO is housed. As shown in the figure, the arrestor element 2 is often used by stacking a plurality of arrestor elements.
To the ground side terminal 4. 5 is a line side terminal, and 6 is a metal cover.

In the arrester having such a structure, a clearance of several mm is formed between the inner surface of the ceramic porcelain tube 1 and the outer surface of the arrester element 2 for convenience of assembly. For this reason, despite the fact that the arrester element 2 is strongly pressed by the coil spring 3, vibration during transportation to the installation location, and particularly vibration used during operation of the switch, is particularly used in the switch. When the arrester element 2 is misaligned inside the porcelain insulator 1, the arrester element 2 may hit the porcelain insulator 1 or the arrester elements 2 may hit each other, causing the end to be chipped.

[0004] Such chipping causes a decrease in the discharge withstand capability (lightning surge current processing capability) of the arrester. In addition, the balance of the energy processing that has been received by the arrester element 2 as a whole may be lost due to the chip, and the life of the arrester element 2 may be shortened due to heat concentration or the like.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a arrester element displacement preventing spacer which prevents the arrester element from being displaced even when subjected to vibration during transportation or the like. It was made to provide.

[0006]

According to a first aspect of the present invention, there is provided a arrester element displacement prevention spacer having an outer diameter slightly smaller than an inner diameter of a porcelain insulator tube in which the arrester element is housed. A plurality of holding claws for holding the ends of the arrester element are formed on the periphery of the reduced metal plate. According to a second aspect of the present invention, there is provided a displacement preventing spacer for an arrester element, wherein a plurality of holding claws for holding an end of the arrester element are formed on a peripheral edge of a metal plate, and the outer diameters of these holding claws are adjusted for the arrester. It is characterized in that it is slightly smaller than the inner diameter of the porcelain insulator tube in which the element is housed.

[0007] These displacement preventing spacers of the arrester element hold the ends of the arrester element by the holding claws, and receive vibration by bringing the peripheral edge of the metal plate or the tip of the holding claw into contact with the inner surface of the porcelain insulator tube. The arrester element can be prevented from being displaced when the arrestor is displaced. For this reason, chipping due to displacement of the arrester element can be prevented, and a reduction in discharge withstand capacity and a reduction in life can be prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. FIG. 1 is a diagram showing an embodiment of the first invention,
Reference numeral 10 denotes a disk-shaped metal plate, and reference numerals 11 and 12 denote a plurality of holding claws formed on both surfaces of the metal plate 10 by bending the peripheral edge thereof up and down. The metal plate 10 has an outer diameter D slightly smaller than the inner diameter of the porcelain insulator 1 so that the metal plate 10 can be inserted into the porcelain insulator 1 shown in FIG. Metal plate 1
0 is preferably a soft metal such as aluminum or copper so as to have good compatibility with the arrester element 2 and to obtain good electrical conductivity.

The inner diameter d of the opposing claws is made substantially equal to the outer diameter of the arrester element 2 so that the holding claws 11 and 12 can hold the end of the arrester element 2. The height of the holding claws 11 and 12 is determined by the arrester element 2.
It is only necessary to be able to hold so that the lateral displacement of the end of
What is necessary is just to make it protrude from the surface of the metal plate 10 about 1-2 mm. The spacer according to the first embodiment is used by being arranged between two arrester elements 2 as shown in FIG.

FIG. 2 is a diagram showing another embodiment of the first invention. The spacer according to the second embodiment is a metal plate 10
The holding claw 11 is formed only on one side of the arrestor element 2 as shown in FIG.

FIG. 3 is a diagram showing an embodiment of the second invention. The spacer according to the second invention has holding claws 13 and 14 inclined on both sides of the metal plate 10 as in FIG. 1, but the holding claws 13 and 14 are located outside the outer periphery of the metal plate 10. The holding claws 13 and 14 are projected so that the outer diameter D of the holding claws 13 and 14 is slightly smaller than the inner diameter of the porcelain insulator tube in which the arrester element is housed. The end of the arrester element 2 can be held inside the inclined holding claws 13 and 14.

FIG. 4 is a view showing an arrester using the spacer shown in FIG. 1 and the spacer shown in FIG. Since the spacer of FIG. 1 has holding claws 11 and 12 at the top and bottom, it is arranged between the two arrester elements 2 and 2, and the holding claw 11 holds the end of the upper arrester element 2 and Holds the end of the lower arrester element 2. Further, the outer periphery of the metal plate 10 is in contact with the inner surface of the porcelain porcelain tube 1 or is located at a position very close to the inner surface of the porcelain porcelain tube 1.

On the other hand, the spacer shown in FIG. 2 has a holding claw 11 only on one side, and the upper arrestor element 2
And the lower end of the lower arrester element 2, and respectively hold the arrester element 2.

FIG. 5 is a view showing an arrester using the spacer of the second invention shown in FIG. This spacer also has holding claws 13 and 14 on the upper and lower sides, and is similar to the spacer of FIG.
The holding claws 13 hold the end of the upper arrester element 2, and the holding claws 14 hold the end of the lower arrester element 2. In this spacer, the tips of the holding claws 13, 14 are in contact with the inner surface of the porcelain porcelain tube 1, or are at a position very close to the inner surface of the porcelain porcelain tube 1.

As described above, when the spacer of the present invention is incorporated in the arrester, the arrester element 2 is held by the holding claws of the spacer, and the spacer itself is also fixed in the porcelain insulator 1. For this reason, even if the arrester is vibrated during transportation or the like, the arrester element 2 does not shift, and the arrester element 2 hits the porcelain porcelain tube 1 or the arrester elements 2 hit each other and the ends are chipped. Is prevented.

[0016] For this reason, it is possible to prevent a reduction in the discharge withstand capacity of the arrester and a reduction in the life of the arrester element 2 due to the chipping. Moreover, since the spacer of the present invention is made of a familiar metal such as aluminum or copper, it does not affect the discharge characteristics of the lightning surge. A cover made of EPDM rubber, silicone rubber, or the like may be attached to the outer periphery of the spacer of the present invention to enhance the cushioning property between the spacer and the porcelain insulator tube 1.

[0017]

As described above, by using the displacement preventing spacer of the present invention, the displacement of the arrester element can be prevented even when the arrester is subjected to vibration during transportation or the like. There is no reduction in the discharge resistance of the arrester due to chipping of the element and no reduction in the life of the arrester element.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the first invention, wherein (A) is a plan view and (B) is a partially cutaway front view.

FIG. 2 is a view showing another embodiment of the first invention,
(A) is a plan view, and (B) is a partially cutaway front view.

FIGS. 3A and 3B are diagrams showing an embodiment of the second invention, wherein FIG. 3A is a plan view and FIG. 3B is a partially cutaway front view.

FIG. 4 is a sectional view of an arrester incorporating the spacer of the first invention.

FIG. 5 is a sectional view of an arrester incorporating the spacer of the second invention.

FIG. 6 is a sectional view of a conventional arrester.

[Explanation of symbols]

1 porcelain insulator, 2 element for arrester, 3 coil spring,
4 Ground side terminal, 5 Line side terminal, 6 Metal cover, 10 Metal plate, 11, 12, 13, 14 Holding claws

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichi Ishida 2-56, Sudacho, Mizuho-ku, Nagoya, Aichi Prefecture Inside Nihon Insulators Co., Ltd. No. 56 Japan Insulators Co., Ltd. F-term (reference) 5E034 EA07 EB02

Claims (4)

[Claims] 1. A metal plate having an outer diameter slightly smaller than an inner diameter of a porcelain insulator tube in which an arrester element is housed,
A displacement preventing spacer for an arrester element, wherein a plurality of holding claws for holding an end of the arrester element are formed. 2. A plurality of holding claws for holding the ends of the arrester element are formed on the peripheral edge of the metal plate, and the outer diameter of these holding claws is determined by the inner diameter of the porcelain insulator tube in which the arrester element is housed. An anti-displacement spacer for arrester elements characterized by being slightly smaller. 3. The arrester element displacement preventing spacer according to claim 1, wherein the metal plate has holding claws on both sides and is disposed between the arrester elements. 4. The arrester element displacement preventing spacer according to claim 1, wherein the metal plate has a holding claw on one surface and is disposed at an end of the arrester element.