JPS5954183A - Zinc oxide arrester - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a zinc oxide type lightning arrester to which a gas pressure airtightness test method can be applied.

[Technical background of the invention and its problems]

An important factor that determines the long-term performance of a lightning arrester is its airtight structure, which protects the internal components of the arrester from moisture in the outside air. Usually, as an airtightness test method for evaluating this airtight structure, a gas pressurized airtightness test method is adopted because it has excellent detection accuracy and is efficient with a distance of 1 m.

This gas pressure airtightness test method uses Freon gas, SF6 gas, etc., which have excellent electrical insulating properties, to mix into the N2 gas atmosphere or dry air filled inside the lightning arrester, and when it diffuses, the lightning arrester will be damaged. This method uses the phenomenon that the discharge voltage of the series gap increases rapidly to determine whether the airtightness is good or bad.

In addition, this gas pressurized airtightness test method is more effective than other airtightness testing methods, such as the so-called underwater bubble tightness test method, in which the lightning arrester is immersed in water or the like to check for air bubbles. Since the alternating current and impulse discharge starting voltages are doubled compared to leakage, extremely high-precision □□□ qi-wiping is possible.

Detection accuracy can be further improved by increasing the pressure of Freon gas, SF, gas, etc. that enters the lightning arrester, or by increasing the time required for expansion after the gas is mixed in. .For example, pressure 0.5/
■If Freon gas, S F 6if gas, etc. from Section 2 are mixed inside the lightning arrester and left for 4 hours to diffuse, 10 e
Leakage of 1/sec brightness can be detected.

Since leakage can be measured indirectly and quantitatively by the amount of change in discharge voltage, there is no false judgment that tends to occur with the underwater bubble airtightness test method mentioned above, and the test method is simple, so it is suitable for inspection of products. This is what I did.

The gas pressurized airtightness test method with the above features uses N2 gas etc. and Freon gas, 8F6
The so-called shaded zinc type arrester, which utilizes the reaction with gas, etc., uses a characteristic element consisting of an oxidized 1F ship-shaped nonlinear resistor, and the series gap arrester using s i, c'. has a different structure and does not have a gap, so there is no electrode for regulating the discharge voltage s++r, so there was a problem that the above gas pressurization airtightness test method could not be applied.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an oxidized lead type lightning arrester to which a gas pressure airtightness test method can be applied.

[Summary of the invention]

Oxidized 4I according to the present invention! In order to achieve the above object, the lead type lightning arrester uses a characteristic element made of a zinc oxide nonlinear resistor, and one external lead conductor is formed as the first electrode inside the lightning arrester. The device is characterized in that it is possible to measure the discharge voltage by insulating the second electrode that faces the first electrode with a gap therebetween.

[Embodiment 1]] An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a configuration diagram showing an embodiment of an I oxide lead resistant lightning arrester according to the present invention.

3- In FIG. 1, Ia is an upper lid body, which is equipped with a line side external lead conductor 2a and an upper pressure relief film 3a made of an insulating material such as an epoxy laminate, and is connected by an upper packing 4a and an upper bolt 5a. The upper lid 1a of the insulator tube 6 seals the upper part. ! A lower lid 1b is sealed to the lower part of the F insulator tube 6 by a lower packing 4b and a lower bolt 5b.

This lower lid body 1b includes a support conductor 7 and a lower pressure avoidance membrane 3b.
and a lower electrode 8b.

The support conductor 7 is the ground side external lead conductor 2b.
A protruding upper electrode 8a is provided on the inner side, and has a small hole 9 on the side surface that is electrically connected to and supports the lower end of a characteristic element to be described later.

Further, the lower pressure protection film 3b is made of an insulating material such as an epoxy laminate. Further, the lower electrode 8b is attached to the F section pressure relief membrane 3b, and
It is attached to the lower pressure avoidance membrane 3b with a bolt 10 and a four-packet 11, facing the gap g.

Further, I2 is a characteristic element consisting of a non-linear resistor based on 11 stn oxide, whose lower part is fixed to the support conductor 7, and whose upper part is connected to the upper lid member r by a spring I3 with a short-circuiting conductor.
a 6ri: I9. Route a(q external lead conductor 2txVc is installed.

In addition, 14 is a gear part gap formed on the inner side of the support conductor 7, and this is configured to communicate with the main part gap 15 formed by the insulator tube 6 and the characteristic element 12 through a small hole 9. ing.

Next, the operation of this embodiment configured as described above will be described. First, the current conduction path of this zinc oxide type lightning arrester is from the line side external lead conductor 2a connected to the power system to the spring 13 with a short circuit conductor, and then the characteristic element 12 absorbs the surge energy and is grounded via the support conductor 7. It reaches the side external lead conductor 2b and is grounded.

In addition, the main part cavity 15 and the gear part cavity 14 are formed by the small hole 7.
These are connected to each other, and an insulating gas such as Freon gas or SF6 gas can be mixed and diffused together with N2 gas or the like.

Furthermore, the upper electrode 8a electrically connected to the ground side external lead conductor 2b and the lower electrode 8b electrically connected to the bolt 10 exposed to the outside are opposed to each other with a gap g interposed therebetween.

Therefore, the airtightness test of this zinc oxide type lightning arrester using the gas pressurized airtightness test method is as follows. That is, the main part gap 15 and the gear part gap 14 are filled with Freon gas or SF in advance. Gas etc. at a pressure of 0.5 Kg 10n
Mix at about b2 level and leave for several hours. After leaving this for a while, by connecting the probe of a discharge voltage measuring device (not shown) to the ground side external lead conductor 2b and the bolt 10 and measuring the discharge voltage, the amount of leakage can be indirectly determined by 6111. The dimensions of the gap g and the shape of the lower electrode 8b can be variously selected depending on the rating of the zinc oxide arrester.

In order to minimize discharge variations during the process, we adopted a shape that provides a uniform electric field for the electrode shape, and the dimension of the gap g is 5~'J- since it is not necessary to use a high TK pressure.
Approximately 0++1m is sufficient.

However, if the packing etc. deteriorate over time in the I-oxidized lead-stopping cedar lightning arrester of this embodiment, and a sealing area occurs and the internal humidity increases, the lower electrode 8a and the lower type f (B8b and Since the discharge voltage changes during this period, it can also be used as an effective and objective inspection means for maintenance and inspection for aging deterioration.

The present invention is not limited to the above-mentioned embodiments, and for example, as shown in FIG. The lid body 1c may be used, and the gist of the present invention can be modified and implemented in various ways.

〔Effect of the invention〕

According to the present invention described above, since the ten-piece electrode and the lower electrode are arranged in one empty space inside the insulator tube, independent of the current-carrying path for J'jl lightning, the gas supply with high detection accuracy is possible. Pressure tightness test 1
We can provide edged lead type 7-surge arresters to which the National Insurance Law applies.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of the zinc oxide type lightning arrester according to the present invention, and FIG. 2 is a partial block diagram showing another embodiment of the zinc oxide type lightning arrester according to the present invention. 1a... Upper lid body, 1b... Lower lid body, 1c...
Molded lower lid body, 2a... Track side external lead-out conductor, 2b... Ground side external lead-out conductor, 3a... Upper pressure relief membrane, 3b... Lower pressure relief membrane, 4a... Upper packing , 4b...lower gasket, 5a...upper bolt, 5
b...Lower bolt, 6...Insulator tube, 7...Support conductor, 8a...Upper electrode, 8b...Lower electrode, 9...
Small hole, 10... Bolt, 11... Packing, I2.
... Characteristic element, 13... Spring with short circuit conductor, 14...
Gear lug gap, 15...Main part gap, g...Gap. Applicant's agent Patent attorney Takehiko Suzue 8-

Claims (1)

[Claims] A first lid body that houses a characteristic element made of a zinc oxide non-linear resistor in a lightning arrester container through a gap, and has a first external lead conductor that is electrically connected to one end of the characteristic element. Alternatively, one end of the lightning arrester container is sealed, and the other end of the lightning arrester container is sealed with a second lid having a second external lead conductor electrically connected to the other end of the characteristic element. In a sealed zinc oxide type lightning arrester, a first electrode having the first lead-out conductor protruding within the gap, and a first electrode having one end connected to the first electrode part within the gap, A second electrode facing the first electrode and having the other end exposed to the outside is connected to the first electrode.
A zinc oxide type lightning arrester characterized in that the lid body is insulated and installed.