JPH06243735A - Electric wire - Google Patents

Abstract

PURPOSE:To eliminate the hindrance of the appearance of a wire, and to strengthen the wire against the external environment, and to facilitate the construction remarkably by forming a hole, to which a cord type sensor is inserted, in the covering part spirally in relative to the center core. CONSTITUTION:A hole 2, to which a cord type sensor l is inserted, is formed in the covering part 4 spirally in relative to the center core 3. This hole 2 is formed, for example, at 5mmphi of diameter, and plural holes 2 at a predetermined length are formed in the circumferential direction with an equal space. A sensor 1 is inserted to the spiral hole 2 to detect the current, temperature, pressure and acceleration or the like. Since the measuring is enabled by only inserting the sensor 1 to the hole 2, the construction is facilitated remarkably, and the environmental countermeasure is not required, and the appearance thereof is not impaired.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electric current, temperature, pressure,
The present invention relates to an electric wire such as an electric power cable to which a sensor such as acceleration can be attached.

[0002]

2. Description of the Related Art An optical current sensor for detecting a current in an electric circuit is usually provided between a light source and a light receiving section in the order of an optical fiber, a collimator, a polarizer, a magneto-optical effect element, an analyzer, a collimator and an optical fiber. The arranged optical paths are provided, and the magneto-optical effect element is arranged on the outer circumference of the distribution line to be measured.

When a current flows through the wire, a magnetic field is generated around the wire, and the plane of polarization of the magneto-optical effect element rotates in proportion to the strength of the magnetic field. On the other hand, when random light from the light source enters the polarizer through the optical fiber and the collimator, linearly polarized light is extracted. When this linearly polarized light enters the magneto-optical effect element and then enters the analyzer rotated by 45 degrees with respect to the polarizer, light having an intensity proportional to the strength of the magnetic field is obtained, and is transmitted to the light receiving portion through the collimator and the optical fiber. It is incident and converted into an electric signal.

Since the magnitude of the current in the electric path is proportional to the strength of the magnetic field, the magnitude of the current can be detected by the signal from the light receiving section.

[0005]

However, when a new optical current sensor is attached to the electric wire, new work is required, and measures such as waterproofing and salt damage are required, which makes the wire large and heavy. However, there was a drawback that the appearance was also impaired. Therefore, it is an object of the present invention to provide an electric wire that does not impair the appearance, is resistant to the external environment, and is extremely easy to construct.

[0006]

The electric wire of the present invention has a hole into which a cord-shaped sensor is inserted, which is formed in a spiral shape with respect to a core wire.

[0007]

According to the structure of the present invention, the cord-shaped sensor is inserted into the spiral hole of the covering portion, so that the current, temperature,
Pressure, acceleration, etc. can be detected. In addition, since it is possible to perform measurement simply by passing a cord-shaped sensor through the hole, construction becomes extremely easy, and it is strong against the external environment and does not impair aesthetics even if environmental measures are not taken.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. That is, in this electric wire, the hole 2 into which the cord-shaped sensor 1 is inserted is formed in the covering portion 4 in a spiral shape with respect to the core wire 3. An example of the electric wire is a power cable such as a power transmission line or a distribution line. Further, the holes 2 are, for example, 5 mmφ, and are formed with a plurality of predetermined lengths at equal intervals in the circumferential direction. Such holes 2 are formed at the time of manufacturing the covering portion 4 by using a mold 13 as shown in FIG. 3, for example. That is, in FIG. 3, 14 is an inlet for coating, 15 is an outlet, 16 is a bottom plate having a cutout, 17 is a wire rod, and 18 is a fiber rod. A gel-like coating, such as butyl rubber, is injected from the inlet 14 and the form 1
Push in butyl rubber while twisting 3 as shown by the arrow.
Butyl rubber is cured from the outlet 15, and the wire rod 1
A hole for inserting the core wire 3 is formed by 7 and the covering portion 4 in which the spiral hole 2 is formed by the fiber molding rod 18 is molded and taken out. Then, the core wire 3 is passed through the hole and the cord-shaped sensor 1 is inserted into the hole 2 to form an electric wire as shown in FIG.

The cord type sensor 1 uses an optical current sensor as an example. As shown in FIG. 2, a multimode first optical fiber 5, a collimator 6, and a thin-film polarizer 7 having a thickness of about 30 μm, such as Lamipole (trade name).
A magneto-optical effect element 8, a thin film analyzer 9 having the same structure as the thin film polarizer 7, a collimator 10, and a second optical fiber 1.
1 are sequentially arranged to form an optical path.

The magneto-optical effect element 3 is interposed between the thin film polarizer 7 and the thin film analyzer 9. In the embodiment, a magneto-optical crystal such as RIG (rare earth iron garnet crystal) having a thickness of 40 μm is applied. And the cord type sensor 1
By using the thin film polarizer 7 and the thin film analyzer 9, the overall size of the device is, for example, 3 mmφ × 20 mm or 1 mmφ × 5 mm, which is the same size as the optical fiber. Therefore, the cord type sensor 1 can be easily inserted into the hole 2 of 5 mmφ.

In this optical current sensor, random light is incident on the thin film polarizer 7 from the light source through the first optical fiber 5 and the collimator 6 and is converted into linearly polarized light. By transmitting this linearly polarized light through the magneto-optical effect element 8 and the thin-film analyzer 9, the magneto-optical effect element 8 rotates the plane of polarization at a rotation angle proportional to the magnitude of the magnetic field around the electric path, and the thin-film analyzer. Since 7 is tilted at a position rotated by 45 degrees with respect to the thin film polarizer 6, linearly polarized light having an intensity proportional to the magnitude of the magnetic field is emitted. This linearly polarized light is the second optical fiber 2
The light is incident on the light receiving portion (not shown) through the through and detects a signal proportional to the intensity of light.

According to this embodiment, by inserting the cord-shaped sensor 1 into the spiral hole 2 of the covering portion 4, the electric current,
It can detect temperature, pressure, acceleration, etc. In addition, since it is possible to measure just by passing the cord-shaped sensor 1 through the hole 2, the installation work can be done very easily like cutting a line, and it is resistant to the external environment without taking environmental measures, and the aesthetic appearance is impaired. Absent.

As another example of the optical current sensor, a polarizer is provided on one end side of a single mode optical fiber having a magneto-optical effect 8 and an analyzer is provided on the other end side, and the polarizer and the opposite side of the analyzer are provided. It is possible to use the one to which another optical fiber is connected (optical fiber current sensor). Further, since the hole 2 is rotating, the required number of turns can be obtained. The light source and the light receiving unit are the same as those in the previous embodiment.

Further, in addition to the current sensor, a sensor such as a temperature sensor, a pressure sensor or an acceleration sensor can be applied to the cord type sensor 1 according to the use of the electric wire. In addition,
The cord-shaped sensor 1 of the present invention may have a cord-shaped element itself, or may have an element and an optical fiber or an electric wire connected to the element.

[0015]

According to the electric wire of the present invention, by inserting the cord type sensor into the spiral hole of the covering portion, the electric current,
It can detect temperature, pressure, acceleration, etc. Further, since the measurement can be performed only by passing the cord-shaped sensor through the hole, the construction is extremely easy, there is no need to take environmental measures, and the aesthetic appearance is not spoiled.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a perspective view of a cord sensor using an optical current sensor before connection.

FIG. 3 is a perspective view of a mold used for manufacturing the covering portion.

[Explanation of symbols]

 1 cord type sensor 2 hole 3 core wire 4 sheath

Claims (1)

[Claims] 1. An electric wire in which a hole for inserting a cord-shaped sensor is spirally formed in a covering portion with respect to a core wire.