JPH11317276A - Arrester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold the gap between electrodes at a specified interval by placing an insulator ball made of a ceramic, alumina, or silicon between the parallel electrode plates. SOLUTION: An alumina ball 1 is installed within a glass tube 2, electrode plates 3 are brought into contact with the alumina ball 1, the alumina ball 1 is used as a spacer, and the electrode plates 3 are held at a specified interval. Lead wires 4 are connected to the electrode plates 3. An inert gas such as argon, nitrogen, or Penning is filled in the glass tube 2 at a pressure corresponding to a target discharge voltage, the glass tube 2 is heated, fusion-bonded to the electrode plates 3, and sealed. In order to start discharge at the aimed discharge voltage, at first the gap is set, and the sealing pressure of a sealing gas is found from the target discharge voltage by using the Paschen curve, test whether discharge is conducted at the target discharged voltage is performed, and the adequate sealing pressure of the inert gas is elected. The specified gap can correctly and simply be obtained in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge type arrester that absorbs overvoltage by discharging. More specifically, the present invention relates to an arrester using parallel electrode plate discharge.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 63-57918 and Japanese Patent Publication No. Hei 7-27
As disclosed in Japanese Patent Publication No. 796 or the like, there is a discharge type arrester in which a conductor thin film is formed on the surface of an insulator, and the conductor thin film is divided by fine lines. There are also arresters utilizing discharge between parallel electrode plates, and all of them utilize discharge characteristics of parallel electrode plates known as Paschen's curve.

[0003]

In an arrester using a parallel electrode plate, the electrode plate is held opposite to a predetermined gap in a glass tube, and the glass tube is fused. It was difficult to keep in the gap.

An object of the present invention is to maintain a gap between electrodes of a parallel electrode plate discharge type arrester at a predetermined interval.

[0005]

A predetermined gap between electrodes can be easily obtained by interposing an insulator such as ceramic, alumina, or silicon necessary for obtaining a required gap between parallel electrode plates. It was done.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An arrester of the present invention will be described with reference to the drawings. As shown in FIG. 1, an alumina ball 1 having a diameter of 300 μm is placed in a glass tube 2, an electrode plate 3 is brought into contact with the alumina ball 1, the alumina ball 1 is used as a spacer, and the electrode plate 3 is set at a predetermined interval. Lead 4 for electrode plate
Is provided.

An inert gas such as argon, nitrogen, or penning is injected into the glass tube 2 at a pressure corresponding to a target discharge voltage, and the glass tube 2 is heated and fused to the electrode plate 3 to be sealed. In the example, argon gas was sealed with a vacuum gas sealing machine at 80 Torr.

It is known that the relationship between the discharge voltage, the gap and the pressure of the sealed gas is based on Paschen's curve (spark voltage between parallel electrodes). In order to start discharge at the target discharge voltage, first, a gap is determined, and the pressure of the charged gas is determined from the target discharge voltage using the Paschen's curve. Then, it is tested whether or not to discharge at a target discharge voltage, and an appropriate inert gas filling pressure is selected.

When the discharge characteristics of the arrester thus manufactured were examined, it was confirmed visually that the arrester was stably discharged. The discharge voltage is 230 on average.
V.

[0010]

As described above, since the insulator is interposed between the parallel electrodes, a predetermined gap can be accurately and easily obtained. The insulator ball is easily available, and the method for manufacturing the arrester does not need to be changed from the conventional method. Also,
Even if an insulator is interposed, the discharge characteristics are not affected, and a conventional method for determining the discharge voltage according to Paschen's curve can be adopted.

[Brief description of the drawings]

FIG. 1 is a front view of an arrester of the present invention. Front view showing an embodiment

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulator ball (alumina ball) 2 Glass tube 3 Electrode plate 4 Lead

Claims (4)

[Claims] 1. An arrester in which an insulator for forming a required gap is interposed between parallel electrode plates. 2. The arrester according to claim 1, wherein the insulator is a sphere. 3. The arrester according to claim 2, wherein the insulator is an alumina ball. 4. The arrester according to claim 1, wherein an inert gas is filled between the electrodes.