JPS61281489A - Lightning arrestor - 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] [Industrial Application Field] The present invention comprises discharging electrodes that are electrically insulated from each other in an airtight discharge vessel and disposing them facing each other at intervals to form a discharging gap. This article relates to a gas-type lightning arrester coated with an activating substance.

[Conventional technology]

BACKGROUND OF THE INVENTION In order to protect electrical equipment connected to a power line, such as communication equipment, from undesired high voltage surges, lightning arresters, such as gas gap arresters, are installed on power lines. This type of lightning arrester generally has a pair of electrodes electrically insulated from each other and placed facing each other in an airtight discharge vessel, and when a high voltage is applied between the pair of electrodes, It is designed to short-circuit by discharging and absorbing high voltage nerds, etc.

In gas-filled gap type lightning arresters, the electrodes generate heat during discharge, and a high-performance electrode activating material is coated on the electrodes to prevent the electrodes from melting due to heat generation.

In general, the discharge electrode of an F-gear or D-type lightning arrester needs to have a shape that has enough resistance to melt due to discharge heat.

However, it is necessary to reduce the size of the lightning arrester, and for this reason, it has been conventionally used to coat the electrodes with a high-performance electrode activating material.

For example, in the past, the surface of the discharge surface of the electrode was covered with a grid pattern, and the electrode activating material was applied to the shallow depressions of the grid.

Furthermore, a deep recess is provided in the center of the electrode, and an electrode activating substance is attached to this deep recess.
No. 163193). This is because the electrode activating material deposited on the electrode surface increases electrical conductivity and thermal conductivity, prevents overheating during discharge operation, and also prevents spasms and substances as much as possible, thereby preventing the insulation from decreasing. This has the effect of extending the life of the lightning arrester.

Such an electrode activating substance can be made into a suspension containing water glass, etc., and applied to shallow or deep depressions to improve workability, or the electrode activating substance tends to stick to the depressions. Do it like this.

According to the lightning arresters described in each of the above-mentioned conventional examples, even if a discharge occurs between the discharge electrodes of the lightning arrester, the electrode activating material deposited on the electrode surface increases the discharge withstand capacity and reduces the smoldering effect.

[Problem that the invention seeks to solve]

In the lightning arresters described in each of the above-mentioned conventional examples, the electrodes are insulated and placed opposite each other to form a gap, and the discharge surface of the electrode is provided with a lattice-like shape or a deep depression is provided on the discharge surface of the electrode,
The structure is such that an electrode activating substance (also called a low work function substance) in the form of a suspension is deposited in these streaks or deep depressions, so if the lattice-like sushi is shallow and long, the suspension will adhere to it. However, it cannot be firmly adhered and may fall off due to discharge action, vibration, etc.

In addition, since it is arranged in the lattice-shaped slits, it is not always deposited only on the slits, but is also deposited on other electrode surfaces, which increases the number of dropouts and also causes variations in the gap between the discharge electrodes. There were drawbacks such as.

In addition, electrodes with deep depressions are more likely to fall off than electrodes with grid-like sushi, but
This is not necessarily satisfactory, and has the disadvantage that it cannot be firmly adhered because it tends to fall off due to shrinkage during sealing, for example.

Such electrode activating material falls off and gears.

If it enters between d and d, a short circuit will occur between the electrodes, and the discharge operating voltage will be lowered, and even if the discharge operating voltage is normal, it will discharge at a lower voltage in the next operation. This causes variations in operating voltage and reduces reliability. Furthermore, variations in the amount of the electrode activating substance deposited will cause variations in the discharge withstand capacity, and furthermore, since it is deposited on the discharge surface of the discharge electrode, the insulation properties will deteriorate.
There were problems such as shortening the life of the lightning arrester.

The present invention was proposed in order to solve the above-mentioned conventional problems, and it is possible to firmly adhere an electrode activating substance to each discharge electrode, thereby preventing short circuits between the electrode gaps and variations in discharge operation. It is an object of the present invention to provide a lightning arrester that can prevent the above-mentioned problems, improve long-term reliability, and further reduce variations in discharge withstand capacity because an electrode activating substance can be deposited substantially uniformly.

[Means for solving problems]

The lightning arrester of the present invention includes a hollow cylindrical body formed of an insulating member;
In the lightning arrester, the lightning arrester has a pair of electrodes that are airtightly sealed and installed at both open end portions of the hollow cylindrical body and that face each other to form a discharge gear. It is characterized in that it has one or more holes, has a concavo-convex portion on the inner circumferential wall of the hole, and has an electrode activating substance mounted inside the hole.

[Effect]

According to the present invention, one or more holes are provided in the discharge surface of the □ electrode in a gap type lightning arrester, and unevenness is formed on the inner circumferential wall of the hole, and the electrode is placed inside the hole with the unevenness. Since the activating material is attached to the hole, the electrode activating material can be held in the hole easily due to the unevenness, and it is also possible to add purified water to the granular powder of the electrode activating material, such as titanium and nickel. Fill it into the hole and press it into the hole using a hand press, etc., so that it fits well with the uneven part of the hole and easily activates the electrode. Can attach substances.

Furthermore, a solder material (in one embodiment of the present invention, silver solder is used because of the electrode activation material) is inserted into the hole, and the electrode activation material is applied in the form of clay (paste) on top of the solder material. In the process of airtightly sealing the electrode and the hollow cylindrical body by pressing it from the top and solidifying it, the electrode activating material is sintered and the sintered electrode activating material is soldered (silver solder) into the hole. Since the electrode activating substance is configured to be attached to the hole, the electrode activating substance can be reliably attached to the inside of the hole. Furthermore, since it is press-fitted, the electrode activating material can be reliably attached to the surface lower than the discharge surface of the electrode, so there is no problem of the discharging gear or gear becoming unstable due to the attachment of the electrode activating material. In addition to reducing the manufacturing cost, since the number of holes is one or more compared to the size of the electrode, the electrode activating substance effectively acts on the discharge withstand capacity, increasing the discharge withstand capacity. can be increased. Furthermore, it is possible to reduce the amount of spatter in the electrode activating substance due to discharge, thereby preventing deterioration in insulation.

〔Example〕

An embodiment of the present invention will be described in detail based on the drawings. 1st
The figure is a sectional view showing the configuration of an embodiment of the present invention, and FIG.
is a cross-sectional view of the electrode in FIG. 1, and FIG. 2(B) is a plan view of the same electrode.

In FIGS. 1 and 2 (4) and (B), 1 is an insulating hollow cylindrical body made of ceramic or glass, and 2 is an insulating hollow cylinder.

Reference numeral 2'' denotes a discharge electrode made of a metal material, which is disposed at the end of the hollow cylindrical body 1 and hermetically seals the inside of the cylindrical body 1.

2.2' is a plate-shaped flange 3 wider than the discharge electrodes 2# and 2''.
．． This convex main electrode 2.2
′ is a discharge electrode? , 2' and the collar 3. J/ is made separately, and is later fixed with solder material 4 (here, soldered with silver).

However, the configuration of the main electrode 2.7 is different from that of the discharge electrode 7.7, respectively.
2# and the collar portion 3.3' may be formed integrally.

5 is a discharge gap formed between the discharge electrodes 25211 of the main electrode 2.2', and the discharge surface 6.6 of this discharge gap 5
Holes 7, 7I are provided in the discharge electrodes 21, 2'' of the hole 7, 7', and an uneven portion 8.8' is provided on the inner peripheral wall of the hole 7, 7'. The uneven portion 8.8' can be easily provided, for example, by providing a female thread.

9. 9' is an electrode activating material installed inside the holes 7, 7', and the mixed powder particles of titanium, 2, kel, etc. are made into a paste by adding purified water, etc., and are placed inside the holes 7, 7'. Fill the hole 7.
The upper part of 7' is pressed to improve installation into the holes 7 and 7'. This is set in the hole 7.7' and has a six-fold protrusion 8.8.
The electrode activating material 9.9' engages with the recess of the surge arrester and is sintered at the sealing temperature during sealing of the lightning arrester.
The solder material (silver solder) 10 provided in the hole portions 7 and 7' is used to securely fix the solder material in the holes 7 and 7'. 11 and 11' are connection terminals, respectively.

Next, the assembly of the lightning arrester according to the embodiment of the present invention shown in FIG. 1 will be explained.

One or more holes 7 are formed in the discharge electrode 2N constituting the main electrode 2 by press working or the like, and an uneven portion 8 is formed in the hole 7 using a female screw or the like. Low)
20 is disposed, and an electrode activating substance 9 is placed on top of this solder material 10.
is filled, and the filled electrode activating substance 9 is pressed in. By press-fitting the electrode activating substance 9, it engages with the concavo-convex portion 8 of the hole portion 7. Next, the discharge electrode 2f formed in this way and the discharge electrode 2" are formed into a plate-like flange 3 which is wider than the electrode 2".
A solder material 4 is disposed at the contact surface with the.

The two main electrodes 2 thus formed are attached to the hollow cylindrical body 1.
The flange 3.3' of the main electrode 2.2' is brought into contact with the end of the main electrode 2.2' to form a discharge gear 5, which is hermetically sealed with a solder material 4'. During this hermetic sealing, the electrode activating substances 9, 9' and the hole 7
．． 7' with solder material 10, and discharge electrode j' + 2'
and tsubabe 3. J' and solder 4 are soldered together at the same time.

In addition, the electrode activating substance 9.9' is inserted into the hole? , 7I, in the present invention, the main electrode 2.2' and the hollow cylindrical body 1 are fixed together when airtightly sealed, but the electrode activating material 9.9' and the hole 7. 7' and discharge electrodes 21, 2
Even if the lightning arrester is constructed by soldering the `` and the flange parts 3, 3' in advance with the solder material 10 or 4, and then hermetically sealing the main electrodes 2, 2' and the hollow cylindrical body 1. Also, when the electrode activating substances 9, 9' are installed in the holes 2.7', they are arranged so as to be lower than the discharge surface 6.6' of the discharge electrode 21.2''.

Next, the operation of the lightning arrester according to the embodiment of the present invention will be explained.

When an undesired high voltage surge is applied between the main electrodes 2 and 7, the gap 5 performs a discharge operation. At this time, the main electrodes 2, 2'
The electrode activating substance 9. provided in the holes 7, 7I of the electrode activator 9. Treat the Group 11 stream by y. In addition, electrode activating substances 9, 9'
is provided 6 to match the size of the discharge surface 6.6' of the main electrode 2.2', and the electrode activating material 9,9' is distributed evenly to the discharge surface
Since the electrode surface resistance is made uniform, the electrode activating substance 9,9' is also dispersed in a small weight, which makes it lightweight and prevents it from falling off.

〔Effect of the invention〕

According to the present invention, the following excellent effects can be achieved.

(2) The electrode activating substance acts uniformly on the electrode surface by dispersing it into a plurality of pieces, and the withstand capacity of the discharge surface of the electrode becomes uniform and there is no bias.

■ Due to the weight reduction due to dispersion, there is less chance of shedding.

■ The unevenness created by the female screw makes it easier to attach the electrode activation substance.

■ Press-fitting makes it easier to wear.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the configuration of an embodiment of the present invention, and FIGS. 2(4) and 2(6) are a partial sectional view and a plan view of the main electrode in FIG. 1, respectively. 1...Hollow cylindrical body, 2,2I...Main electrode, 6,61.
...discharge surface, 7,7'...hole, 8.8'...irregularity, 9.9'...electrode activating material.

Claims (1)

[Claims] In a lightning arrester having a hollow cylindrical body formed of an insulating member, and a pair of electrodes that are airtightly attached to openings at both ends of the hollow cylindrical body and face each other to form a discharge gap, each of the opposing surfaces of the electrodes is provided with a perforation. 1. A lightning arrester comprising: at least one hole having an uneven inner peripheral wall; and an electrode activating material mounted inside the hole.