JP2002095158A - Lightning surge suppressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightning surge suppressor free from the deterioration of magnetic characteristics irrespective of its usage environment, capable of protecting electronic communications equipment from the lightening surge current highly safely, and excellent in durability. SOLUTION: In this lightning surge suppressor 1 for radio facilities, the entire surface except the end surfaces of a pair of U-shape cores 2a, 2b made of a magnetic material is covered by roughly U-shape casings 5a, 5b (one end of which is attached to each other with a shaft and hinges 4 in such a way as to be rotatable freely and locking means 3a, 3b which can be fitted to and locked with each other are provided on the other end) formed by solidifying a high-polymer resin. The disposed end surfaces are covered by compound magnetic materials 10 in sheet to completely seal a pair of the cores 2a, 2b. The compound magnetic materials 10 are each sandwiched between a pair of the cores 2a, 2b by fitting and locking the locking means 3a, 3b to and with each other in an installing and mounting state to the surface of a coaxial cable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic communication device in a building which is attached to a surface of a coaxial cable used mainly in a radio equipment installed in a broadcasting station, a radio station or the like, and which is connected to the coaxial cable. The present invention relates to a lightning surge suppressor for preventing a failure due to a lightning surge current induced by a lightning strike.

[0002]

2. Description of the Related Art Conventionally, as a radio equipment to which this kind of lightning surge suppressor is applied, for example, a radio equipment having a configuration as shown in FIG. The radio equipment includes a transmission / reception antenna 24 installed at the top of a tower 21 which is a high place and fixed in the air, an electronic communication device 26 installed in a building 25 such as a broadcasting station or a radio station, Antenna 2
4 and an electronic communication device 26, and includes a coaxial cable 12 for transmitting information such as signals and control, and a lightning surge suppressor 11 as an inductor attached to the surface of the coaxial cable 12.

In such a radio equipment, a steel tower 21 having a transmitting / receiving antenna 24 fixed in the air is used for a lightning strike 2 from a thundercloud 22.
If the lightning surge suppressor 11 is not used, the electronic communication device 26 is often damaged by the lightning surge current induced in the coaxial cable 12 if the lightning surge suppressor 11 is not used. Therefore, the lightning surge suppressor 11 functions as an inductor to suppress the lightning surge current and protect the electronic communication device 26.

Incidentally, the lightning surge suppressor 11 is usually formed as an inductor having a predetermined inductance by abutting a pair of U-shaped cores formed by dividing a cylindrical body made of a magnetic material such as silicon steel or amorphous into two. Is done.

[0005]

The lightning surge suppressor for radio equipment described above has a simple structure in which a pair of U-shaped cores made of a magnetic material are joined together, and the installation place is environmentally outdoor. Because of the large number, there is a problem that the magnetic characteristics are deteriorated due to the formation of water droplets or rust on the mating surfaces.

Therefore, measures have been taken to protect the abutting surface by sandwiching a sheet made of resin or the like between the abutting surfaces. However, in such a case, a predetermined inductance cannot be obtained, or the design of the magnetic characteristics also becomes poor. There is a problem that the degree of freedom is impaired.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and its technical problem is that the magnetic characteristics are not deteriorated regardless of the use environment, and the safety of electronic communication equipment is protected from lightning surge current. An object of the present invention is to provide a durable lightning surge suppressor capable of providing high protection.

[0008]

According to the present invention, there is provided a lightning surge suppressor having a structure in which a pair of U-shaped cores made of a magnetic material are abutted against each other. A lightning surge suppressor provided with a sheet-shaped composite magnetic body so as to be sandwiched in the abutting state on the abutting surface with the vicinity is obtained.

Further, according to the present invention, in the above lightning surge suppressor, the pair of U-shaped cores are made of a polymer resin which is solidified so as to cover the entire surface excluding the end surfaces which are the abutting surfaces, and one end of each is formed. It has a pair of substantially U-shaped cases provided on the other end side thereof with a pair of substantially U-shaped cases which are pivotally mounted by hinges and the other end side thereof. A lightning surge suppressor provided so as to cover the end face of the core and interposed between the pair of U-shaped cores by the locking of the locking member is obtained.

Further, according to the present invention, in the lightning surge suppressor, the pair of U-shaped cores can be housed from openings at positions corresponding to respective abutting surfaces of the pair of U-shaped cores, and the U-shaped cores can be mutually housed. One end side is hinged by a hinge, and the other end side is provided with a pair of substantially U-shaped cases made of a polymer resin provided with fittings that can be fitted respectively. Are provided so as to cover the end surfaces of a pair of U-shaped cores which are housed in a substantially U-shaped case and are exposed from an opening, and are sandwiched between the pair of U-shaped cores by locking of a locking member. A deployed lightning surge suppressor is obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The lightning surge suppressor of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing a basic configuration of a lightning surge suppressor 1 for radio equipment according to an embodiment of the present invention in an open state. FIG. 2 is a perspective view showing that the lightning surge suppressor 1 is attached to a predetermined portion of the coaxial cable 12 in a closed state.

This lightning surge suppressor 1 has a structure in which a pair of U-shaped cores 2a and 2b made of a magnetic material such as silicon steel or amorphous are abutted, as in the prior art. Here, a pair of U-shaped cores 2a and 2b are used. A sheet-shaped composite magnetic body 10 is provided on the abutting surfaces of the vicinity of one end side and the vicinity of the other end side of 2b so as to be sandwiched in the abutting state.

The pair of U-shaped cores 2a and 2b here are:
For example, when directional silicon steel is used as a magnetic material, when forming these U-shaped cores 2a and 2b, a silicon steel strip is wound and annealed, and then a cylindrical body fixed with an ABS resin or the like is formed at the center in the longitudinal direction. An example is shown in which the shape is cut into a shape having an outer diameter φ1 of 140 mm, an inner diameter φ2 of 100 mm, and a thickness of 100 mm.

On the other hand, the composite magnetic body 10 is made of Fe-A
kneading a flat or needle-like soft magnetic fine powder made of an l-Si alloy or the like and an organic binder made of a polyurethane resin or the like,
Dispersed and formed into a plate-like shape, length 95mm, width 15
mm and a sheet having a thickness of 0.5 mm.

The lightning surge suppressor 1 is a pair of substantially U-shaped polymer resin solidified over the entire surface of the pair of U-shaped cores 2a and 2b except for the end surfaces which are the abutting surfaces. It has mold cases 5a and 5b.
One end of each of the pair of substantially U-shaped cases 5a and 5b is pivotally attached to the hinge 4 and the other end is provided with a fitting 3a or 3b that can be fitted to each other. However,
Here, the substantially U-shaped cases 5a and 5b are formed by solidifying the entire surfaces except the end surfaces of the pair of U-shaped cores 2a and 2b with resin, or by using a pair of U-shaped cores 2 made of ABS resin or the like in advance.
a, 2b may be formed as a separate body capable of being housed, and a pair of U-shaped cores 2a, 2b may be housed through openings at positions corresponding to respective abutting surfaces of the pair of U-shaped cores 2a, 2b. good. In addition, the locking tool 3b here has a claw shape, and the locking tool 3a has a hook shape fitted into the claw shape. Thereby, the sheet-shaped composite magnetic body 10 is provided so as to cover the end surfaces of the pair of exposed U-shaped cores 2a and 2b, or the pair of substantially U-shaped cases 5a and 5b.
Pair of U-shaped cores 2 housed in a box and exposed through an opening
a.
3b, the U-shaped cores 2a and 2b are sandwiched between the pair of U-shaped cores 2a and 2b.

That is, in the case of this lightning surge suppressor 1,
The entire surface of the pair of U-shaped cores 2a, 2b except the end faces is covered with a pair of substantially U-shaped cases 5a, 5b, and the end faces are covered with a sheet-shaped composite magnetic body 10, and provided on one end side. A portion facing the hinge 4 with the hinge 4 as the axis center is openable and closable, and the fittings 3a and 3b provided on the other end are fitted and locked to form the coaxial cable 12. Can be mounted on the surface.

Therefore, according to the lightning surge suppressor 1, the entire surfaces of the pair of U-shaped cores 2a, 2b except for the end faces are covered by the pair of substantially U-shaped cases 5a, 5b, and are exposed as abutting surfaces. The pair of U-shaped cores 2 are formed by covering the formed end surfaces with a sheet-shaped composite magnetic body 10.
a and 2b are completely sealed, and the composite magnetic body 10 is attached to the surface of the coaxial cable 12 by fitting and locking of the locking members 3a and 3b provided on the pair of substantially U-shaped cases 5a and 5b. Since the configuration is provided so as to be sandwiched between the pair of U-shaped cores 2a and 2b, a predetermined inductance is properly secured as an inductor without deteriorating magnetic characteristics when the mounting is performed on the surface of the coaxial cable 12. In addition, even if the installation place of the coaxial cable is outdoors such that it is exposed to the weather, a pair of U-shaped cores 2a,
The entire surface including the end face of 2b can be protected from water droplets, rust and the like.

Next, the lightning surge current suppression effect was measured by a simulation circuit for measuring the lightning surge current suppression effect of the LR system circuit including the lightning surge suppressor 1 and the lightning surge simulator 30 as shown in FIG.

However, in the equivalent circuit of the simulation circuit for measuring the lightning surge current suppression effect, the open circuit voltage is 0.4
kV, and the equivalent inductance L ₀ during a lightning strike is 1.1 μm.
H, the inductance L ₁ of the tower 21 side together with the assumed as 1.7MyuH, the inductance L ₂ corresponding to the lightning surge suppressor 1 and 19.6MyuH, the lightning surge current suppression effect of series connected 1Ω the inductance L ₁ It can be measured by a current i ₁ flowing through the resistor and a current i ₂ flowing through a 2Ω resistor connected in series with the inductance L ₂ .

FIG. 4 shows the measurement result of the lightning surge current suppression effect with the presence or absence of the lightning surge suppressor 1 (inductance L ₂ ) in the simulation circuit for measuring the lightning surge current suppression effect in terms of the current with respect to time. FIG. 2A shows a state in which the lightning surge suppressor 1 is not inserted, and FIG. 2B shows a state in which the lightning surge suppressor 1 is inserted.

[0022] FIG. 4 (a), the referring to (b), when the current i ₁ of the inductance L ₁ of the insertion presence in spite tower 21 side of the lightning surge suppressor 1 are the same, the lightning surge suppressor 1 in the case of using the corresponding inductance L ₂ is greatly reduced current i ₂ as compared to not using, can be sufficiently suppressed absorb lightning surge current induced during lightning with lightning surge suppressor 1 I understand.

In the lightning surge suppressor 1 of the above-described embodiment, an example is described in which the sheet-like composite magnetic body 10 is provided on each of the exposed end faces of the pair of U-shaped cores 2a and 2b. The composite magnetic body 10 may be provided so as to be sandwiched in an abutting state at the abutting surfaces of the pair of U-shaped cores 2a and 2b near one end side and the other end side. For example, the U-shaped core 2a , 2b is provided only on the end face of the abutting surface between the vicinity of one end and the vicinity of the other end, or the vicinity of one end of one of the U-shaped cores 2a, 2b and the other of the U-shaped cores 2a, 2b. It may be selectively provided so as to be provided on the end surface of the abutting surface with the vicinity of the end side. The polymer resin used for the pair of substantially U-shaped cases 5a and 5b is a thermoplastic resin such as a polyolefin resin or a polyamide resin,
Although a thermosetting resin such as a phenol resin or an epoxy resin can be exemplified, the polymer resin is not limited to those exemplified as long as it is a polymer resin applicable to the above-described embodiment.

[0024]

As described above, according to the lightning surge suppressor of the present invention, the entire surface excluding the end faces of the pair of U-shaped cores is covered by the pair of substantially U-shaped cases, The exposed end faces are covered with a sheet-shaped composite magnetic body to completely seal the pair of U-shaped cores, and the composite magnetic body is mounted on a pair of substantially U-shaped cases in a state of being attached to the surface of the coaxial cable. The structure is such that it is sandwiched and disposed between a pair of U-shaped cores by the fitting and locking of the locking tool, so that there is no deterioration in magnetic characteristics when mounting and mounting on the surface of the coaxial cable. In addition to ensuring a predetermined inductance as good, even if the installation location of the coaxial cable is outdoors such as exposed to the wind and rain, the entire surface including the end faces of the pair of U-shaped cores may be water droplets or the like. It can be protected from such to result in the excellent from regardless lightning surge current to the use environment when attached to the coaxial cable of the radio equipment durability capable of protecting the safety higher electronic communication equipment.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a basic configuration of a lightning surge suppressor for wireless equipment according to an embodiment of the present invention in an open state.

FIG. 2 is a perspective view showing a state in which the lightning surge suppressor shown in FIG. 1 is attached to a predetermined portion of the coaxial cable in a closed state.

FIG. 3 is an equivalent circuit showing a basic configuration of a simulation circuit for measuring a lightning surge current suppression effect of an LR system circuit including the lightning surge suppressor and the lightning surge simulator shown in FIG. 1;

4A and 4B show measurement results of a lightning surge current suppression effect obtained by the lightning surge current suppression effect measurement simulation circuit shown in FIG. 3 depending on whether or not a lightning surge suppressor is inserted, in terms of a current with respect to time, and FIG. (B) relates to a state where the surge suppressor is not inserted, and (b) relates to a state where the lightning surge suppressor is inserted.

FIG. 5 is a schematic diagram showing a basic configuration of a radio equipment to which a conventional lightning surge suppressor is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 Lightning surge suppressor 2a, 2b U-shaped core 3a, 3b Locking tool 4 Hinge 5a, 5b Case 10 Composite magnetic sheet 12 Coaxial cable 21 Iron tower 22 Thundercloud 23 Lightning strike 24 Transmitting and receiving antenna 25 Building 26 Electronic communication equipment 30 Lightning Surge simulator

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yukio Tatsumi 3-43 Babacho, Chuo-ku, Osaka-shi, Osaka F-term in the Japan Broadcasting Corporation Osaka Broadcasting Station (reference) 5G013 AA07 BA02 BA03 CA18 CB29 DA09

Claims (3)

[Claims] 1. A lightning surge suppressor having a structure in which a pair of U-shaped cores made of a magnetic material are abutted,
A lightning surge suppressor characterized in that a sheet-shaped composite magnetic body is provided on abutting surfaces of the pair of U-shaped cores near one end side and near the other end side so as to be sandwiched in abutting state. 2. A lightning surge suppressor according to claim 1, wherein said pair of U-shaped cores are made of a polymer resin that is solidified so as to cover the entire surface of each of said pair of U-shaped cores except for the end surfaces to be said abutting surfaces, and one end of each of said U-shaped cores is formed. A pair of substantially U-shaped cases each provided with a locking member that is pivotally mounted by a hinge and that can be fitted to the other end thereof, wherein the sheet-shaped composite magnetic body is exposed to the pair of U-shaped members; A lightning surge suppressor provided so as to cover an end surface of the U-shaped core and sandwiched between the pair of U-shaped cores by the locking of the locking member. 3. The lightning surge suppressor according to claim 1, wherein said pair of U-shaped cores can be accommodated in said pair of U-shaped cores through openings at positions corresponding to said abutting surfaces, respectively. One end is pivotally mounted by a hinge, and the other end has a pair of substantially U-shaped cases made of a polymer resin provided with fittings that can be fitted respectively,
The sheet-shaped composite magnetic body is provided so as to cover end surfaces of the pair of U-shaped cores housed in the pair of substantially U-shaped cases and exposed from the openings, and engages with the locking member. A lightning surge suppressor characterized in that the lightning surge suppressor is disposed so as to be sandwiched between the pair of U-shaped cores by a stop.