JPH07120526A - High frequency electric field detecting sensor and apparatus for locating electric wire failure - Google Patents

Abstract

PURPOSE:To provide an apparatus for locating electric wire failures which can properly probe a position of a failure such as breakage of an electric wire even if numerous wires are placed close to one another. CONSTITUTION:The high frequency electric field detecting sensor 2 of the breakage position locating apparatus comprises a thin-plate-shaped sensor 22 made of a metal such as aluminum and a metallic foil 26 such as aluminum, which are adhered to each other via an insulating double-sided resin adhesive tape 24. When an electric field from an electric wire to be located is detected, the electric field detecting part 2 is inserted between the electric wire to be located and another wire so that the sensor 22 faces the electric wire and the metallic foil 26 faces the other wire. Thus an electric field due to high frequency voltage from a high frequency voltage generator induced from the wire to be determined to the other wire is shielded by the double-sided resin adhesive tape 24 and the metallic foil 26 so that it is not detected by the sensor 22. Therefore only an electric field from the wire to be located is detected, thereby properly locating a position of breakage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact type high frequency electric field detection sensor and a wire abnormality which can accurately evaluate an abnormality such as a wire break even when a plurality of wires are laid in close proximity. Regarding rating device.

[0002]

2. Description of the Related Art A breakage point may occur in an electric wire due to various causes, and it is necessary to search the position of the breakage point existing in the electric wire in order to repair the breakage point. There are various methods for exploring the position of the disconnection point, and the high-frequency injection method is known as one of them. In this high-frequency injection method, for example, a high-frequency voltage generator is connected to one end of the electric wire, a high-frequency voltage is applied to the electric wire, and the electric field emitted from the electric wire is detected to detect the breakage point in a non-contact manner. Specifically, in the high-frequency injection method, the electric field due to the high-frequency voltage is detected from the wire located on the high-frequency voltage generator side with respect to the wire where the wire breaks, but Since the high-frequency voltage is not propagated to the wire located on the opposite side of the voltmeter due to the wire break point, and the electric field is not detected from this position, the wire break position scoring device is moved along the wire to detect the electric field. Assuming that the disconnection point exists at the position where is no longer detected, the disconnection point is searched.
The conventional disconnection position evaluation device has a structure in which the entire metal sensor for measuring the electric field is exposed, and when investigating the fault point of the indoor wiring consisting of a single wire or a small number of wires used for general houses, etc. , Effective.

[0003]

However, when a large number of electric wires are laid close to each other, such as the wiring shown in FIG. 8 used in buildings, for example, the electric wire 1 is supplied with a high frequency voltage from a high frequency voltage generator. Is applied and an attempt is made to search for the disconnection point E using the conventional disconnection position evaluation device, when the electric field from the point B of the electric wire 1 located on the opposite side of the disconnection point E from the high-frequency voltage generator is detected, There is also a problem that the electric field from the point D of 2 is also detected, and the accident point cannot be searched accurately by the high frequency injection method. This is electric wire 2-n
Is not grounded, and since the electric wire 1 and the electric wires 2 to n are close to each other, the high-frequency voltage applied to the electric wire 1 is induced in the electric wires 2 to n and the electric field near the point D of the electric wire 2. This is because, when the metal sensor of the disconnection position evaluating device, which is entirely exposed, detects the electric field from the point B, it also detects the electric field from the point D.

The present invention has been made in view of the above-mentioned problems of the prior art, and even when a large number of electric wires are laid close to each other, a high frequency electric field detection capable of accurately searching for an abnormality such as disconnection of the electric wires. An object is to provide a sensor and a wire abnormality evaluation device.

[0005]

In order to solve the above-mentioned problems of the prior art and to achieve the above-mentioned object, a high frequency electric field sensor of the present invention detects a high frequency electric field and a high frequency electric field. And a shield member provided on a side facing at least the detection site of the member.

Further, the wire abnormality evaluating apparatus of the present invention comprises the above-mentioned high frequency electric field detection sensor, means for applying a high frequency signal to the detection target wire in an environment where a plurality of wires are in close proximity, and the detection target wire in the longitudinal direction. The high-frequency electric field detection sensor moving along has a means for determining an abnormality of the electric wire when an electric field of a predetermined strength is detected.

[0007]

In the wire abnormality evaluating apparatus of the present invention, for example, a high-frequency voltmeter is connected to an electric wire to be searched for an abnormality such as a disconnection, and another electric wire is positioned in the vicinity thereof, and a high-frequency voltage is applied to the electric wire. It Then, the high-frequency electric field emitted from the electric wire is detected by using the high-frequency electric field detection sensor, and based on the signal from the high-frequency electric field detection sensor, for example, the position where there is an abnormality such as disconnection of the electric wire is evaluated.

For example, the high frequency detection sensor is moved along the electric wire from the side of the high frequency voltage generator, and it is assumed that there is an abnormality at a position where the high frequency detection sensor does not detect the high frequency electric field. To do. At this time, the high-frequency electric field from another electric wire located close to the electric wire to be searched for the abnormality is blocked by the shield member of the high-frequency electric field detection sensor, and the member detecting the high-frequency electric field is the target to be searched. Only the high frequency electric field from the electric wire is detected.

[0009]

EXAMPLE A first example will be described. In the present embodiment, when an electric wire (hereinafter, referred to as an accidental electric wire) having an abnormality such as a disconnection is previously determined, the electric wire abnormality evaluation including the high frequency electric field detection sensor of the present invention is used to disconnect the accidental electric wire. The case of evaluating the position of a point will be described. Whether or not there is a break in the electric wire is detected by, for example, inputting a predetermined electric signal from the input end of the electric wire to be detected and outputting a predetermined electric signal from the output end of the electric wire. It is determined by conducting a continuity test. FIG. 1 is a diagram for explaining a disconnection position evaluation device 1 of this embodiment as an electric wire abnormality evaluation device. FIG. 2 is a cross-sectional view of the high frequency electric field detection sensor of the disconnection position evaluation device 1 of this embodiment. As shown in FIG. 1, the disconnection position evaluation device 1 includes a high frequency electric field detection sensor 2, an arithmetic processing unit 4 and a display unit 6. As shown in FIG. 1, the high-frequency electric field detection sensor 2 has a thin plate shape. As shown in FIG. 2, a thin plate-shaped sensor portion 22 made of metal such as aluminum and a metal foil 26 such as aluminum are provided. It is structured such that the insulating double-sided resin adhesive tape 24 is attached to the surface. The metal foil 26 has its end grounded.

When the sensor section 22 is exposed to a high frequency electric field,
A detection signal S22 indicating that the high frequency electric field has been detected is output to the arithmetic processing unit 4 via the wiring 5. The double-sided resin adhesive tape 24 and the metal foil 26 serve as a shield member, and the high frequency electric field from the accidental electric wire 1 is detected by the sensor unit 2.
At the time of detection by 2, the high frequency electric field from the other electric wires 2 to n is electromagnetically shielded to prevent the sensor section 22 from detecting the high frequency electric field from the electric wires 2 to n.

The arithmetic processing unit 4 receives the detection signal S22 from the sensor unit 22, performs a predetermined calculation according to the detection signal S22, and detects the high frequency electric field by the sensor unit 22 and the position of the accidental electric wire 1. Then, it is determined whether or not there is a disconnection point, a display signal S4 is created according to the determination result, and this display signal S4 is output to the display unit 6. The above determination as to whether or not there is a disconnection point is such that when the sensor unit 22 is moved along the accident electric wire 1 from the side to which the high frequency voltage device is connected, the sensor unit 22 no longer detects the high frequency electric field. It is assumed that there is a broken point at the position.

The display unit 6 has a display, for example,
An image showing the determination result according to the display signal S4 from the arithmetic processing unit 4 is displayed on the display.

Next, a method of searching for the breakage point of the accidental electric wire by the high frequency injection method using the breakage position evaluation device 1 will be described. If the accidental wire 1 shown in FIG. 8 has a disconnection point E, a high-frequency voltage generator is connected to the accidental wire 1 and a high-frequency voltage is applied to the accidental wire 1.

Then, as shown in FIG. 1, the high frequency electric field detection sensor 2 of the disconnection position evaluating device 1 is provided between the accidental electric wire 1 and the electric wires 2 to n so as to separate the accidental electric wire 1 from the electric wires 2 to n. insert. At this time, in the high frequency electric field detection sensor 2, the accident wire 1 and the wires 2 to n are arranged so that the sensor portion 22 faces the accident wire 1 and the metal foil 26 faces the wires 2 to n.
Insert between and. By doing so, the high frequency electric field due to the high frequency voltage from the high frequency voltage generator induced from the accidental electric wire 1 to the electric wires 2 to n is shielded by the double-sided resin adhesive tape 24 and the metal foil 26, and depending on the sensor section 22. Not detected.

Then, the high frequency electric field detecting sensor 2 detects the high frequency electric field emitted from each position of the accidental electric wire 1 while moving the high frequency electric field detecting sensor 2 along the accidental electric wire 1 in the direction shown by the arrow in FIG. 1, for example. The detection result of the sensor unit 22 is
The detection signal S22 is output to the arithmetic processing unit 4. The arithmetic processing unit 4 performs a predetermined arithmetic operation according to the detection signal S22, and determines whether or not a disconnection point exists at the position of the faulty electric wire where the sensor unit 22 is currently detecting the high frequency electric field. . The display signal S4 according to the determination result is output to the display unit 6, and the image according to the determination result is displayed on the display of the display unit 6.

As described above, according to the disconnection position evaluating device 1 of this embodiment, the high frequency electric field from the wires 2 to n other than the accident wire 1 is applied to the double-sided resin adhesive tape 24 and the metal foil 26.
It is shielded by and is not detected by the sensor unit 22. As a result, even when the accident electric wire 1 and the electric wires 2 to n are laid close to each other, only the high-frequency electric field from the accident electric wire 1 can be detected, and the position of the disconnection point existing in the accident electric wire 1 can be accurately searched. be able to.

In the above-mentioned embodiment, the case where it is determined in advance that it is an accidental electric wire has been described. However, when it is not determined whether the electric wire is an accidental electric wire having a disconnection point, it is necessary to maintain the electric wire. The disconnection point evaluation device 1 of the present embodiment may be used to search for the disconnection point by the method described above.

The second embodiment will be described. FIG. 3 is a diagram for explaining the disconnection position evaluation device 31 of the present embodiment. FIG. 4 is a sectional view of the high-frequency electric field detection sensor of the disconnection position evaluation device 31 of this embodiment. As shown in FIG. 3, the disconnection position evaluation device 31 has the same configuration as that of the disconnection position evaluation device 1 of the first embodiment described above, but the high frequency electric field detection sensor 32 has a rod shape, and the fault detection is performed. The shape of the high frequency electric field detection sensor 2 of the device 1 is different. As shown in FIG. 4, the high-frequency electric field detection sensor 32 has a sensor portion 34 made of metal such as aluminum in a rod shape, and a metal foil 3 such as aluminum provided so as to cover the lower surface of the sensor portion 34.
8 and the sensor portion 34 are attached to each other with a double-sided resin adhesive tape 36.

In the disconnection position evaluation device 32, when the disconnection point E of the accidental electric wire 1 shown in FIG.
As shown in, the high frequency electric field detection sensor 32 is inserted between the accidental electric wire 1 and the electric wires 2 to n. At this time, the high frequency electric field detection sensor 32 is inserted between the accidental electric wire 1 and the electric wires 2 to n so that the sensor unit 34 faces the accidental electric wire 1 and the metal foil 38 faces the electric wires 2 to n. In this way, the high frequency electric field due to the high frequency voltage from the high frequency voltage generator induced from the accidental electric wire 1 to the electric wires 2 to n is shielded by the double-sided resin adhesive tape 36 and the metal foil 38 and detected by the sensor 24. Not done.

According to the disconnection position evaluation device 31 of the present embodiment, in the same manner as the disconnection position evaluation device 1 of the first embodiment described above, when the accident electric wire 1 and the electric wires 2 to n are laid close to each other. However, it is possible to accurately search the position of the disconnection point existing in the accident electric wire 1.

A third embodiment will be described. In the above-described embodiment, the case where the position of the break point is evaluated by using the break point rating device of the present invention with respect to the electric wire in which the break point is determined to exist. In the present embodiment, a case will be exemplified in which an abnormality existing in an electric wire is evaluated by using the disconnection point evaluation device 1 of the first embodiment described above with respect to an electric wire for which it is not determined whether or not the electric wire exists. .

In the present embodiment, in the same manner as in the case of the above-mentioned first embodiment, the breaking point evaluation device 1 is moved along the electric wire to be evaluated, and the strength of the high frequency electric field emitted from the electric wire. To detect. Then, when the strength of the detected high-frequency electric field decreases, it can be known that there is some abnormality at the evaluation position of the electric wire targeted for evaluation. In this way, also in the present embodiment, when there is a break in the electric wire, the position of the break and the electric wire can be discriminated, as in the first embodiment.

For example, the electric wire to be evaluated is an electric wire formed by bundling a plurality of thin electric wires, and although the electric wire is not completely broken, some of the thin electric wires forming the electric wire are broken. Even in such a case, it is possible to evaluate the presence of an abnormality in the electric wire by detecting that the strength of the high frequency electric field emitted from the electric wire at the disconnection position is reduced by using the disconnection position evaluation device 1. You can In this case, according to the disconnection position evaluation device 1, as described above, the high-frequency electric field from another electric wire which is not the object of the exploration can be effectively shielded. It is possible to effectively detect the change in the high-frequency electric field that occurs when a part of the electric wire is present at the breaking point, and it is possible to accurately evaluate the abnormality existing in the electric wire.

Further, in the disconnection point evaluation device 1 of this embodiment,
Even if there is a portion where the electric wire is about to be cut, the abnormality can be accurately evaluated and the disconnection can be prevented in advance.

The high-frequency electric field detection sensors 2 and 32 described above have shapes other than the thin plate shape and the rod shape, for example, as shown in FIG.
The shapes shown in (A) to (E) and FIGS. 7 (A) to (D) may be used.

The high-frequency electric field detection sensor is shown in FIG.
As shown in (A) and (B), the sensor section 42 is covered with a shield member made of a metal foil 46 and a double-sided resin adhesive tape 44 so that the sensor section 42 is exposed only at a detection site for detecting a high-frequency electric field. May be. By doing so, it is possible to more effectively shield the high-frequency electric field from an electric wire other than the electric wire to be searched, and improve the accuracy of the search.

As shown in FIGS. 5A and 5B,
A plate 47 for sandwiching the electric wire may be provided in the vicinity of the exposed portion, and the electric wire may be sandwiched between the plates 47 so that the electric wire is appropriately positioned at the detection site of the sensor unit 42.

The double-sided resin adhesive tape may be any other adhesive tape or adhesive as long as it has insulation properties, and the sensor section is limited to aluminum as long as it can induce a high frequency electric field. Not done. Furthermore, the shield member is not limited to the shield member illustrated in the present embodiment as long as the shield function described above can be appropriately exhibited.

[0029]

As described above, according to the high frequency electric field detection sensor and the electric wire abnormality evaluation device of the present invention, when the electric wire to be searched and the other electric wire are installed close to each other, It is possible to effectively shield the high-frequency electric field from the electric wire, and it is possible to effectively detect only the high-frequency electric field from the electric wire that is the target of the exploration. , Its position can be accurately evaluated.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a disconnection position evaluation device according to a first embodiment.

FIG. 2 is a cross-sectional view of a high frequency electric field detection sensor of the disconnection position evaluation device of the first embodiment.

FIG. 3 is a diagram for explaining a disconnection position evaluation device according to a second embodiment.

FIG. 4 is a cross-sectional view of a high frequency electric field detection sensor of a disconnection position evaluation device according to a second embodiment.

5A is an external view of another example of the high-frequency electric field detection sensor of the disconnection position evaluation device, and FIG. 5B is a cross-sectional view thereof.

6 (A), (B), (C), (D), and (E) are diagrams for explaining modified examples of the shape of the high-frequency electric field detection sensor.

7 (A), (B), (C), and (D) are diagrams for explaining modified examples of the shape of the high-frequency electric field detection sensor.

FIG. 8 is a diagram for explaining a problem in a conventional accident point search for an accident electric wire.

[Explanation of symbols]

 1, 31 ... Disconnection position evaluation device 2, 32 ... High-frequency electric field detection sensor 4 ... Calculation processing unit 6 ... Display unit 22, 34, 42 ... Sensor unit 24, 36, 44 ...・ Double-sided resin adhesive tape 26, 38, 46 ... Metal foil

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshikatsu Kiyohara 1-6-3 Haneda Airport, Ota-ku, Tokyo Nihon Airlines Co., Ltd. Technical Research Institute

Claims (2)

[Claims] 1. A high-frequency electric field detection sensor having a member for detecting a high-frequency electric field, and a shield member provided on at least a side of the member for detecting the high-frequency electric field facing a detection site. 2. The high-frequency electric field detection sensor according to claim 1, means for applying a high-frequency signal to the detection target electric wire in an environment in which a plurality of electric wires are close to each other, and moving along the longitudinal direction of the detection target electric wire. An electric wire abnormality evaluation device comprising: a means for determining an abnormality of the electric wire when the high-frequency electric field detection sensor detects an electric field of a predetermined strength.