JPS63245901A - 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 Object of the Invention (Field of Industrial Application) The present invention relates to a lightning arrester that is both explosion-proof and waterproof.

(Prior art) Existing lightning arresters conventionally used for 3 to 30 KV distribution lines are made of zinc oxide (Zn), which has nonlinear voltage-current characteristics.
A current limiting element made of O) or the like is molded as a single unit or as a plurality of series arrays with an organic elastic insulating material such as rubber or resin.

On the other hand, some conventional lightning arresters have the current limiting element housed in a ceramic tube.

(Problem to be Solved by the Invention) However, the former conventional example has a problem in that when the creeping surface of the organic elastic insulating material is contaminated with dust, salt, etc., creeping discharge occurs, causing tracking and erosion. .

Further, in the latter type of lightning arrester, if the airtightness of the insulator tube lumen is broken and moisture enters, a creeping current will flow in the insulator tube lumen or the surface of the current limiting element, generating an arc and causing the insulator tube to explode. At this time, there was a risk that fragments of the broken insulator pipe would fly off and cause harm to passersby on the road.The first object of the present invention is to prevent the lightning arrester from discharging even if the surface of the lightning arrester is contaminated with dust, salt, etc. The object of the present invention is to provide a lightning arrester with excellent weather resistance that does not cause tracking or erosion.

The second purpose is to provide a structure that prevents moisture from reaching the current limiting element, and the third purpose is to provide a structure that prevents moisture from reaching the current limiting element, and the third purpose is to prevent fragments of the insulator from flying far away and hitting passersby on the street even if the arrester explodes. The purpose is to provide a lightning arrester that does not cause any harm.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention accommodates a current-limiting element with non-linear voltage-current characteristics in the inner cavity of the insulator tube, and The gap between the surface of the element and the inner peripheral surface of the insulator tube is filled with an organic elastic insulating material such as rubber or resin, and electrode fittings are bonded and fixed to both upper and lower ends of the insulator tube via sealing members. There is.

(Function) By adopting the above-mentioned means, the present invention functions as follows.

The insulator can suppress the occurrence of tracking and erosion, and even if the sealing member loses its sealing properties and moisture intrudes into the insulator, the organic elastic insulating material will prevent it from adhering to the current limiting element. This can prevent deterioration of the current limiting element due to moisture.

In addition, the current-limiting element is exposed to high temperatures and high temperatures due to lightning surge current that exceeds expectations.
Even if an explosion occurs due to a high-pressure arc, the mechanical energy can be absorbed by the organic elastic insulating material, and even if the insulating tube breaks, fragments will not be scattered far away, improving safety. can.

(Example) Hereinafter, an example embodying the present invention will be described based on the drawings.

A through hole 1b is provided in the upper end lid portion 1a of the porcelain insulator tube 1 in the shape of a closed cylinder.
is formed, and an electrode rod 2 as an electrode fitting having a substantially inverted T-shape is passed through the through hole 1b, and a nut-shaped tightening fitting is attached to the outer end of the electrode rod 2 via an O-ring 3 as a sealing member. 4 is screwed and fixed. An annular i2b is formed on the upper surface of the lower end flange portion 2a of the electric excavation rod 2, and an O-ring 5 as a sealing member is also accommodated in the gap 2b. An arcing horn (not shown) is attached to the upper part of the electrode rod 2, which faces a distribution line (not shown) with a predetermined air discharge gap.

A gasket 6 as a sealing member is provided at the lower end of the insulator tube 1.
A cap-shaped electrode fitting 7 is fitted through the cap-shaped electrode fitting 7, and its outer peripheral edge is caulked and fixed to a bulge IC formed on the outer periphery of the lower end of the insulator tube 1.

In addition, a lightning arrester is attached to the outer periphery of the insulator tube 1 by a power pole arm (not shown).
A mounting bracket 8 for mounting on is fixed.

Inside the insulator tube 1, a plurality of current limiting elements 9 made of zinc oxide or the like with non-linear voltage-voltage characteristics are stacked in series, and between the lower end surface of the current limiting elements 9 and the electrode fitting 7 is a cylindrical conductive element 9. A sexual spacer lO is interposed. A gap unit 15 consisting of a cylindrical insulating spacer 11 and upper electrodes 12 and 14 fixed to both upper and lower ends of the spacer 11 with an adhesive 13 is disposed on the upper end surface of the current limiting element 9. has been done.

Further, the upper electrode 12 and the flange portion 2a of the electrode rod 2
A coil-shaped conductive spring 16 is interposed between the current-limiting elements 9 and the current-limiting elements 9 to press them against each other.

The inner circumferential surface 1d of the insulator 1, the outer circumferential surface 9a of the current limiting element 9, and the outer circumferential surface 10a of the spacer 10.11.

11a, the internal space of the spacer 10, and the inner and outer spaces of the spring 16 are filled with an organic elastic insulating material 17 such as rubber or resin. The coefficient of thermal expansion of this organic elastic insulating material 17 is larger than that of the insulating tube 1, so when filling the insulating material 17, a void is provided at the inner lower part of the insulating tube 1 so that the insulating material 17 can absorb its own thermal expansion. It is desirable to keep it.

Next, the operation of the lightning arrester configured as described above will be explained.

Now, when a lightning surge current flows through the electrode rod 2 on the energizing side, it passes through the spring 16, floods over between the two electrodes 12 and 14 of the gap uni-node 15, flows through the current limiting element 9, and flows from the spacer lO. It reaches the electrode metal fitting 7, further flows to a metal arm (not shown), and is discharged to the earth. Furthermore, subsequent currents that occur thereafter are blocked by the gap unit 15 and the current limiting element 9, thereby preventing a ground fault from occurring.

Now, in the embodiment of the present invention, the current limiting element 9 is housed inside the insulator tube 1, and the gap between the inner circumferential surface 1d of the insulator tube 1 and the outer circumferential surface of the current limiting element 9 is filled with an organic elastic insulating material 17 and bonded. So,
Compared to lightning arresters whose current-limiting elements are molded with rubber, tracking and erosion can be suppressed, and in the unlikely event that the O-ring 3 and packing 6 lose their sealing properties, moisture can infiltrate into the insulator tube 1. However, the organic elastic insulating material 17 prevents the current-limiting element 9 from adhering to the current-limiting element 9, thereby preventing deterioration of the current-limiting element 9 due to moisture.

Furthermore, even if the current limiting element 9 explodes due to a high temperature and high pressure arc caused by a lightning surge current that exceeds expectations, the mechanical energy at that time can be absorbed by the elastic insulating material 17, and even if the insulating tube 1 is damaged, the mechanical energy at that time can be absorbed. , it is possible to prevent debris from being scattered far and improve safety.

In the above embodiment, a through hole 1b was formed in the lid 1a of the insulator tube 1, and an inverted T-shaped electrode rod 2 was passed through the through hole 1b, and an O-ring 3 was interposed between it and the upper end surface of the lid 1a. However, in this case, the number of parts can be reduced to simplify the structure, and the area of the sealing part can be minimized to maintain stable sealing performance over a long period of time. When assembling the rod 2 and O-ring 3, place the electrode rod 2 in 1.
This can be easily done by simply penetrating the portion 1a and aligning the tightening member 4.

Furthermore, in the embodiment described above, the O-ring 5 was interposed between the flange portion 2a of the electrode rod 2 and the lid portion 1a of the insulator tube, but in this case, even if the sealing performance of the upper O-ring 3 were to deteriorate, The O-ring 5 maintains watertightness inside the insulating tube, and the sealing property can be maintained reliably for a long period of time, and deterioration of the current limiting element 9 due to moisture can be prevented, thereby preventing a major accident from occurring. become something that can be done.

Note that the present invention can also be embodied as follows.

(1) The conductive spacer 10 is formed into a columnar shape.

(2) The gap unit 15 may be omitted.

(3) The electrode plate 12.degree. 14 of the gap unit 15 and the spacer 11 are hermetically fixed with an adhesive.

(4) The spring 16 can be omitted. In this case, the current limiting element 9 shall be made into a single unit.

Effects of the Invention As detailed above, the present invention can prevent tracking and erosion even if the surface of the lightning arrester is contaminated with dust, salt, etc. It is possible to reliably prevent moisture from entering the lightning arrester, and furthermore, even if the lightning arrester explodes, it has the effect of preventing fragments of the insulator tube from scattering far and causing harm to passersby on the road.

[Brief explanation of drawings]

The figure is a longitudinal cross-sectional view of the central part of an embodiment of a lightning arrester embodying the present invention. 1... Insulator tube, 2... Electrode rod as electrode fitting, 3...
...O-ring as a sealing member, 4...tightening metal fittings,
6... Packing as a sealing member, 7... Electrode fitting, 9... Current limiting element, lO... Spacer, 15...
- Gap unit, 17... organic elastic insulating material.

Claims (1)

[Scope of Claims] 1. A current limiting element with non-linear voltage-current characteristics is accommodated in the inner cavity of the insulator tube, and rubber or resin is provided in the gap between the surface of the current limiting element and the inner peripheral surface of the insulator tube. Filled with organic elastic insulation materials such as
A lightning arrester characterized in that electrode fittings are bonded and fixed to both upper and lower ends of the insulator tube via seal members. 2. The insulator tube is formed into a cylindrical shape with a lid, and an electrode rod as an electrode fitting having an almost inverted T shape is penetrated and supported in the center of the lid, and an O-ring as a sealing member is attached to the outer end. The lightning arrester according to claim 1, wherein the fastening fitting is screwed and fixed therebetween. 3. The lightning arrester according to claim 2, wherein an O-ring as a sealing member is also interposed between the flange portion formed at the inner end of the electrode rod and the inner surface of the lid portion of the insulator tube.