JPS6021909Y2 - Grounding wire with built-in surge arrester element for power distribution lines - Google Patents

Description

[Detailed description of the invention] Since the present invention allows the lightning arrester to be installed as a branch connection of the distribution line, there is no need for any support means for attaching it to the utility pole, and furthermore, the surge arrester element can be scattered due to the rise in internal pressure of the surge arrester part. The present invention relates to a grounding wire with a built-in lightning arrester element that can prevent such problems.

Surge arresters are used as the main lightning damage protection device on high-voltage power distribution lines, etc. They protect the insulation of electrical equipment by limiting the peak value of shock overvoltage that enters circuits due to snow damage, and reduce follow-on current in a short time. It functions as a cutoff.

This lightning arrester function prevents the normal state of the line from being disturbed and allows it to recover to its original state.

However, since lightning arresters are generally installed using supporting metal fittings, it is necessary to secure a space for this purpose, and there are restrictions on where they can be installed, especially around pole-mounted transformers. .

An object of the present invention is to provide a grounding wire with a built-in lightning arrester element for a power distribution line that does not require any supporting metal fittings for installation, and therefore allows for improved pole mounting.

Another object of the present invention is to provide a grounding wire with a built-in surge arrester element for a distribution line in which the surge arrester element will not be scattered due to a current that cannot be absorbed by the surge arrester element or due to an increase in internal pressure caused by a discharge phenomenon due to deterioration of the interface of the surge arrester element. It is to be.

In order to achieve each of the above objects, the grounding wire with a built-in surge arrester element for a distribution line based on the present invention has a non-following current limiting resistance element such as a ZnQ element, a series gap arranged in series with this, and the above-mentioned limiting resistance element. A tube intermediate layer surrounding the resistance element and the series gap, a pair of insulated wires connected to the electrodes at both ends, and a tube provided on the outer layer of the tube intermediate layer and extending from one insulated wire to the other insulated wire. an integrally molded insulator, said one electrode and said one
A fusing part is provided between the two insulated wires and the conductor, and a cutting part is provided in the insulator on the outer periphery of the fusing part.

From the above configuration, since a pair of insulated wires are integrally molded at both ends, it is possible to install the lightning arrester simply as a branch connection of the wires, without requiring a specific location for installing the lightning arrester. Therefore, it is possible to improve the installation of the pole, which eliminates the need for supporting metal fittings and the like for installing the lightning arrester, which brings about a desirable result from an aesthetic point of view.

What is more important than these is that a fusing part is provided between one electrode and the insulated wire conductor, and a cutting part is provided in the insulator on the outer periphery, so that the internal pressure of the lightning arrester can rise sufficiently. Previously, a certain value of current would fuse and cut the part.

Therefore, accidents such as the surge arrester being destroyed due to an increase in the internal pressure of the surge arrester and the surge arrester elements being scattered can be prevented.
It also brings about excellent results in terms of public safety.

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view showing a main part of a grounding wire with a built-in lightning arrester element for a distribution line based on the present invention, in which two ZnO
For example, the non-following current limiting resistance elements 1 and 1a and the series gaps 2 and 2a arranged in series therewith are, for example,
Its outer periphery is surrounded by a tube intermediate layer 4 made of a heat-shrinkable tube.

The series gaps 2 and 2a are maintained at appropriate electrical lengths by inorganic spacers 3.

One element of series gap 2 and non-following limiting resistor element 1
A and Drain sleeves 5 and 6 for electrodes are provided in close contact with each other.

The conductors 7 and 7a of a pair of insulated wires 8 and 8a are compressed and connected to the drainage sleeves 5 and 6, and the drain sleeves 5 and 6 are connected to each other by compression. mold insulator 10
is applied.

What should be noted here is that the electrode drainage sleeve 6 has an electrode part 6a, a crushed part 6b, and a sleeve part 6C, and the crushed part 6b is provided with a plurality of holes 6d, and its cross-sectional area is (See also Figure 2).

This reduced cross-section portion acts as a fusing portion, and a slit 9 is formed in the integrally molded insulator 10 around the outer periphery of this fusing portion to provide a cutting portion.

With the above configuration, the non-following current limiting resistance elements 1 and 1a
When a current that cannot be absorbed by this element flows, the crushed portion 6b, which acts as a fusing portion, arcs and melts due to self-heating before the internal pressure within the arrester rises sufficiently.

In order to reduce the mechanical strength, a slit 9 is formed on the outer periphery of this fusion section to reduce the mechanical strength. Easy to cut based on.

Due to this disconnection, current no longer flows through elements 1 and 1a, which is caused by the increase in internal pressure within the arrester.
The scattering of A, etc. is effectively prevented, and an excellent effect on public safety is brought about.

The grounding wire with a built-in lightning arrester element for distribution lines according to the present invention can be used in two ways: the side on which the series gaps 2 and 2a are located is the power supply side, or the grounding side. Assuming that it is used as a circuit, no voltage is always applied to the non-following current limiting resistance elements 1 and 1a due to the presence of the series gaps 2 and 2a, which has the effect of preventing acceleration of their deterioration.
Moreover, since the above-mentioned state maintains a state in which no voltage is applied even after fusing and cutting, it has the effect of preventing melting with a different phase at the fusing and cutting part and electric shock accidents.

The above explanation has clarified the structure and effects of the grounding wire with a built-in surge arrester element for distribution lines according to the present invention. However, the structure in which the fusing part is the cutting part is due to the shape of the crushed part 6b and the slit 9, as described above. The present invention is not limited to this, and it is easy to make other configurations that can be freely adopted by those skilled in the art, such as replacing the fusing part with a material with high electrical resistance, or configuring the cutting part with a material with a low melting point. Please understand that it is possible.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing one embodiment of the present invention, and main parts are shown in cross-section. FIG. 2 is a perspective view showing an electrode drainage sleeve having a fusing portion. Explanation of symbols: 1, 1a... Non-following current limiting resistance element, 2, 2a... Series gap, 3...
・Inorganic spacer, 4...tube layer (middle layer), 5, 6... electrode drainage sleeve, 6a...
...Electrode part, 6b...Crushed part (fused part),
6c... Sleeve part, 6d... Hole, 7
,7...conductor,8. Death...Insulated wire, 9
...Slit (cutting part), 10...Integrated mold insulator.

Claims (1)

[Claims for Utility Model Registration] ZnO connected in series between a pair of electrodes with drainage sleeves
a non-driving resistance element and a gap, insulated wires on the charging side and grounding side connected to both electrodes, respectively, and an insulating shrinkable tube coated on the entire outer peripheral surface of the resistance element,
an insulating rubber molded part that is integrally coated from one side of the pair of insulated wires to the other, has a plurality of folds on its outer circumferential surface, and is in close contact with the entire outer circumferential surface of the tube and the entire outer surface of the drain sleeve-equipped electrode at the inner periphery; The rubber molded portion located from the outer peripheral surface of each electrode to the outer peripheral portion of each insulated wire serves as a stress cone portion, and one of the insulated wires is connected to a charging side distribution line wire,
The other is connected to a grounding wire, one of the pair of electrodes with draining sleeves is provided with a fusing portion consisting of a crushed portion, and the rubber molded portion of the outer cylinder of the fusing portion is provided with a cutting portion consisting of a slit. A grounding wire with a built-in surge arrester element for power distribution lines.