JPH10125509A - Arrestor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide no disconnecting rod inside an element by making a through electrode pass through an attaching stand, grounding one side of a through electrode by a lead which is attached and detached freely, providing a fixed electrode and a connecting conductor to the other side and laminating an element between a through electrode and a fixed electrode. SOLUTION: A through hole is formed at a center of an attaching stand 13 and a through electrode 14 is fixed airtightly to the through hole. A lead 21 whose one end is grounded is fixed to one side of the through electrode 14 to be attached and detached freely. A fixed electrode 16 is provided to the other side and four supporting rods 17 positioned on the attaching stand 13 support the fixed electrode 16. A plurality of zinc oxide elements 18 and an electrode 19 laminated between the through electrode 14 and the fixed electrode 16 are provided to an inside of the four supporting rods 17. A connecting conductor 20 is fixed integrally to the fixed electrode 16. A charge voltage test of a gas insulation opening/closing device can be performed readily by loosening a bolt 15 and removing the lead 21 from the through electrode 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A lightning arrester is housed in a gas insulated switchgear. When conducting a withstand voltage test of a gas insulated switchgear, the surge arrester may be damaged due to a large applied voltage. Therefore, it is necessary to disconnect the arrester during the withstand voltage test. For this reason, some lightning arresters are provided with disconnectors.

FIG. 5 shows a conventional lightning arrester provided with a disconnector. In the drawing, 1 is a mounting seat, 2 is a support fixed to the mounting seat 1, 3 is an electrode made of aluminum, 4 is arranged at equal intervals along an arc on the support 2, and the support 2 and the electrode 3 , Four supporting rods made of FRP for connecting the same, a zinc oxide element laminated in a single row on an insulating table (not shown) via a ground terminal 6, and 7 for connecting the contact (not shown) to the electrode 3. A disconnecting rod 10 formed by connecting the conductor portion 8 and the insulating rod 9 is a holding plate for restraining downward movement of the disconnecting rod 7, and 11 is an O-ring.

In such a lightning arrester, a current flows from the conductor 8 → the electrode 3 → the zinc oxide element 5 → the ground terminal 6. And
When performing a withstand voltage test, after removing the holding plate 10, an eyebolt or the like is screwed into a tap hole on the lower surface of the insulating rod 9, and the disconnecting rod 7 is lowered by a stroke S to a position indicated by a virtual line to disconnect.

[0005]

However, since the disconnecting mechanism is disposed in the high-pressure section at the upper part of FIG. 5, the space occupied by the high-pressure section becomes large, which hinders downsizing of the gas-insulated switchgear. Further, the stroke S must be increased so as to withstand the withstand voltage between the high-voltage portion and the disconnecting rod during the withstand voltage test, and this also hinders downsizing of the gas insulated switchgear. Furthermore, since the element unit and the disconnecting rod are separately installed, they occupy a lot of space and the number of parts increases. Furthermore, it is necessary to hermetically seal the space between the disconnecting rod and the mounting seat, and it is necessary to pay attention to airtight leakage during disconnection work.

Therefore, an object of the present invention is to provide a lightning arrester that solves the above problem.

[0007]

According to a first aspect of the present invention, there is provided a power supply apparatus comprising: a base made of an insulating material; While grounding via a wire, a fixed electrode is provided on the other side of the through electrode, a connection conductor is provided on the fixed electrode, and an element is laminated between the through electrode and the fixed electrode. The configuration of the invention according to Item 2 is characterized in that a capacitor is detachably provided between the through electrode and the lead wire.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

(A) Embodiment 1 FIG. 1 shows the structure of an arrester according to the present invention. A mounting base 13 is provided for air-tight mounting in an opening of a housing 12 constituting the gas insulated switchgear. The mounting base 13 is made of an insulating material in a scrambled shape. A through hole is formed at the center of the mounting base 13, and a through electrode 14 is hermetically mounted in the through hole. The other end of the lead wire 21 whose one end is grounded is connected to the bolt 15
It is detachably attached via.

On the other hand, a fixed electrode 16 is provided between the through electrode 14 and the other surface of the through electrode 14 for laminating the elements. The fixed electrode 16 is supported via four support rods 17 made of FRP arranged at equal intervals along an arc on the mounting base 13. A plurality of zinc oxide elements 18 and electrodes 19 laminated between the through electrode 14 and the fixed electrode 16 are provided inside the four support rods 17.

The fixed electrode 16 has the connecting conductor 2
0 is integrally fixed and provided. Here, case 1
2 is in the atmosphere on the right side, and the left side is the inside of the housing 12 filled with the insulating gas.

When conducting a withstand voltage test of the gas insulated switchgear, the bolt 15 may be loosened and the lead wire 21 may be removed from the through electrode 14 as shown in FIG.

(B) Second Embodiment Next, FIG. 3 shows a lightning arrester according to a second embodiment of the present invention. In this embodiment, the overall configuration is the same as that of the first embodiment, except that the lightning arrester is not disconnected.
A capacitor 22 for voltage sharing is connected between the capacitor and the lead wire 21.

The operation of the surge arrester is the same as that of FIG. 1, but when conducting a withstand voltage test of the gas insulated switchgear, a capacitor 22 is provided between the through electrode 14 and the lead wire 21 as shown in FIG. Connecting. When the capacitor 21 is connected in this manner, the voltage applied to the lightning arrester during the withstand voltage test is shared with the capacitor 21, thereby preventing damage to the lightning arrester.

(C) Third Embodiment Next, FIG. 4 shows a lightning arrester according to a third embodiment of the present invention. This embodiment is preferably adopted when the insulation distance between the through electrode and the housing cannot be sufficiently secured or when the insulation distance of the mounting stand cannot be sufficiently secured inside the gas insulated switchgear.

As shown in the figure, a large mounting base 13a is provided instead of the mounting base 13 of the first embodiment. The mounting table 13a is filled with an insulating material and has a shape protruding in a conical shape toward the atmosphere. In addition, the through electrode 14a is also replaced by the length of the mounting base 13a according to the first embodiment.
It is formed longer.

In such an arrester, the housing 12 and the cable 2
The distance from the first end to the other end is longer than in the first embodiment, and the insulation distance can be increased.

[0018]

As can be seen from the above description, according to the lightning arresters according to the first and second aspects, since the disconnecting rod is not provided inside the element as in the prior art, the lightning arrester can be downsized in the radial direction. Also, by removing the lead wire from the penetrating electrode and disconnecting it, or connecting a capacitor between the penetrating electrode and the lead wire so that a large applied voltage is not applied to the surge arrester, preparation for withstand voltage test is easier than before. It is simple and simple, and can reduce the time required for the withstand voltage test of the gas insulated switchgear. Further, in the past, a problem of airtightness was caused by moving the disconnecting rod, but such a problem was eliminated because the disconnecting rod was not used.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a lightning arrester according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating the operation of the lightning arrester according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating the operation of a lightning arrester according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a lightning arrester according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram of a conventional lightning arrester.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 ... Mounting stand 14 ... Through-electrode 16 ... Fixed electrode 18 ... Zinc oxide element 20 ... Connection conductor 21 ... Lead wire 22 ... Capacitor

Claims (2)

[Claims] 1. A fixed electrode is provided on the other side of the penetrating electrode while the penetrating electrode is penetrated through a mounting base made of an insulating material and one side of the penetrating electrode is grounded via a detachable lead wire. A lightning arrester characterized in that a connection conductor is provided on an electrode, and elements are stacked between a through electrode and a fixed electrode. 2. The lightning arrester according to claim 1, wherein a capacitor is detachably provided between the through electrode and the lead wire.