JP2015184050A - Wire coating deterioration detector and wire coating deterioration detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire coating deterioration detector (detection method) capable of detecting highly accurately deterioration of a wire coating.SOLUTION: The deterioration degree of a wire which is a detection object is determined by analysis of reflectance in a wavelength region of 400 nm to 550 nm which lowers greatly in proportion to aging of the wire which is the detection object in reflected light of light hit onto the wire which is the detection object.

Description

  The present invention relates to an electric wire covering deterioration detection device and an electric wire covering deterioration detection method that are performed based on wavelength analysis of reflected light from a detection target.

  Control wiring (wires) routed to the control panel of the power receiving / transforming equipment may not be able to properly transmit control signals through its own wiring as its covering deteriorates over time. It leads to malfunction of the power equipment of the power receiving / transforming equipment. For this reason, in order to prevent this, the degree of deterioration of the control wiring is detected.

  As one example, as shown in Patent Document 1, for example, white light is irradiated to a control wiring to be detected, the reflected light is received and dispersed with a spectroscope, and in a predetermined wavelength region reflecting the degree of deterioration. A technique for detecting the deterioration state of the control wiring from the degree of decrease in light intensity is known. In this document, the deterioration of the wiring is determined by paying attention to the wavelength region of 560 nm to 800 nm in the reflected light.

JP 2011-252846 A

  By the way, the present inventors are studying to detect the deterioration of the control wiring with higher accuracy. That is, an object of the present invention is to provide an electric wire covering deterioration detecting device and an electric wire covering deterioration detecting method that can detect deterioration of electric wire covering with higher accuracy.

  The wire covering deterioration detection device that solves the above problem irradiates light to a detection target wire, divides the reflected light with a spectroscope, and degrades the detection target wire based on the subdivided reflectance for each wavelength. A wire covering deterioration detection device that detects the degree of the electric wire, and includes a determination unit that determines the degree of deterioration of the detection target electric wire based on an analysis of reflectance in a wavelength region of 400 nm to 550 nm in the reflected light. .

  According to this configuration, the degree of deterioration of the detection target electric wire is determined by analyzing the reflectance in the wavelength region of 400 nm to 550 nm in the reflected light applied to the detection target electric wire. In other words, the reflectance in this wavelength band greatly decreases as the detection target electric wire progresses (see FIGS. 2 to 6 and 7), so that the degree of deterioration of the detection target electric wire can be accurately detected. is there.

Moreover, in the above-described wire covering deterioration detection device, it is preferable that the determination unit performs the deterioration degree determination based on an analysis of reflectance in a wavelength region of 400 nm to 500 nm in the reflected light.
According to this configuration, the reflectance in the wavelength region of 400 nm to 500 nm is greatly reduced as the detection target electric wire progresses (see FIGS. 2 to 6 and 7). By analyzing the above, it is possible to accurately detect the degree of deterioration of the electric wire.

Moreover, in the above-described wire covering deterioration detection device, it is preferable that the determination unit performs the deterioration degree determination based on an analysis of reflectance in a wavelength region of 400 nm to 460 nm in the reflected light.
According to this configuration, the reflectance in the wavelength range of 400 nm to 460 nm is uniformly reduced in proportion to the age of the electric wire to be detected (see FIGS. 2 to 6 and 7), and thus the reflection in this wavelength range. By analyzing the rate, it is possible to contribute to improving the accuracy of wire deterioration detection.

Moreover, in the above-described wire covering deterioration detection device, it is preferable that the determination unit determines the deterioration degree by further adding a reflectance in a wavelength region of 550 nm to 700 nm in the reflected light.
According to this configuration, the reflectance in the wavelength region of 550 nm to 700 nm decreases in proportion to the aging of the electric wire to be detected (see FIGS. 2 to 6 and 7), and therefore the reflectance in this wavelength region is further increased. By taking the analysis into account, it is possible to contribute to improving the accuracy of the wire deterioration detection.

  Moreover, the wire covering deterioration detection method that solves the above-described problem is directed to irradiating the detection target wire with light and dispersing the reflected light with a spectroscope, and based on the subdivided reflectance for each wavelength, An electric wire covering deterioration detection method for detecting a deterioration degree, wherein the deterioration degree of the detection target electric wire is determined based on an analysis of reflectance in a wavelength region of 400 nm to 550 nm in the reflected light.

  According to this configuration, the reflectance in this wavelength region greatly decreases with the lapse of time of the electric wire to be detected as described above (see FIGS. 2 to 6 and FIG. 7), so the degree of deterioration of the electric wire to be detected is accurate. It can be detected.

  According to the electric wire covering deterioration detection apparatus and electric wire covering deterioration detection method of the present invention, the electric wire covering deterioration can be detected with higher accuracy.

It is a lineblock diagram of an electric wire covering deterioration detection device in one embodiment. It is a characteristic view which shows the reflectance distribution of the electric wire of a new article (normal article). It is a characteristic view which shows the reflectance distribution of the electric wire of 4 years old goods. It is a characteristic view which shows the reflectance distribution of the electric wire of 7-year-old goods. It is a characteristic view which shows the reflectance distribution of the electric wire of an aged product for 10 years. It is a characteristic view which shows the reflectance distribution of the electric wire of a 25-year-old product. It is a characteristic view of the reflectance distribution used for description of another example of deterioration determination.

Hereinafter, an embodiment of a wire coating deterioration detection device (method) will be described.
As shown in FIG. 1, the wire covering deterioration detection device 10 includes a light source 11, a spectroscope 12, a processing unit (CPU) 13, and a memory 14.

  The light source 11 is configured to be capable of emitting white light including at least a wavelength region of 400 nm to 700 nm, and the white light generated by the light source 11 is detected when the deterioration degree of the covering portion 20a of the electric wire 20 to be detected is detected. 20 is irradiated. The white light irradiated on the electric wire 20 is reflected on the surface of the covering portion 20a of the electric wire 20, and the reflected light (light mainly composed of reflected light) is incident on the spectroscope 12. The spectroscope 12 divides the incident reflected light into a wavelength region of, for example, 400 nm to 700 nm for each 10 nm width, and measures the intensity of light for each wavelength subdivided for each 10 nm width. The width is not limited to 10 nm. The processing unit 13 calculates the reflectance for each wavelength of the incident light subdivided by the spectroscope 12 with the white light emitted from the light source 11 as a reference.

  Here, FIGS. 2 to 6 show the reflectance distribution in the wavelength region of 400 nm to 700 nm of the reflectance of the electric wire 20 (covering portion 20a) from the new article (normal article) to each aging. Incidentally, the electric wire 20 of the present embodiment is, for example, a vinyl insulated wire for electric equipment (JIS_C3316) used for control wiring arranged in a control panel of a power receiving / transforming facility, that is, the covering portion 20a is a vinyl insulating material, It is colored yellow.

  FIG. 2 shows the reflectance distribution of a new (normal) electric wire 20, and the reflectances subdivided every 10 nm width are all 100%. In other words, in order to make a reference for comparison with the aged products of FIGS.

  FIG. 3 shows the reflectance distribution of the four-year-old electric wire 20. The reflectance of 100% is maintained in each wavelength region of 400 nm to 480 nm and 540 nm to 700 nm. In the wavelength region of 480 nm to 540 nm, the reflectance is less than 100%, and the distribution is a partially concave shape showing about 77% of the minimum value at the wavelength of 510 nm.

  FIG. 4 is a reflectance distribution of the electric wire 20 which is aged for 7 years. Compared with a four-year-old product, it decreases in the entire wavelength region of 400 nm to 700 nm, and the total is less than 100%. In each wavelength region of 400 nm to 460 nm and 530 nm to 700 nm, it is substantially constant at about 89 to 94%. In the wavelength range of 460 nm to 530 nm, a concave distribution is formed in the same manner as a four-year-old product, and it is about 75% of the minimum value at a wavelength of 500 nm.

  FIG. 5 shows the reflectance distribution of the 10-year-old electric wire 20. Compared to 7-year-old products, it further decreases in the entire wavelength region of 400 nm to 700 nm, approximately constant at about 78 to 80% in the wavelength region of 400 nm to 450 nm, and about 82 to 86% in the wavelength region of 530 nm to 700 nm. It is almost constant. In the wavelength region of 450 nm to 530 nm, it is a portion having a concave distribution as in the case of 7-year-old products, which is about 64% of the minimum value at a wavelength of 500 nm.

  FIG. 6 shows the reflectance distribution of the electric wire 20 that is aged for 25 years. In the wavelength region of 550 nm to 700 nm, it is approximately constant at about 80 to 81% and slightly stops as compared with a 10-year-old product, but the degree of decrease in reflectance increases from less than 550 nm. At the wavelength of 480 nm, the minimum value is about 40%, and on the side where the wavelength becomes shorter than this, the reflectance is about 40 to 46% and becomes a substantially constant distribution.

  Summarizing the above, it can be seen that the reflectance in the wavelength region of 400 nm to 500 nm is greatly reduced from about 100% to about 40% as the aging of the electric wire 20 progresses. Among them, the reflectance in the wavelength region of 400 nm to 460 nm is greatly reduced in proportion to the aging of the electric wire 20. Incidentally, in the wavelength range longer than 550 nm, the reflectance decreases in proportion to the aging of the electric wire 20, but the degree of decrease is smaller than 500 nm or less. That is, if the reflectance in the wavelength region of 400 nm to 500 nm is used for the determination of the degree of deterioration of the electric wire 20 (covering portion 20a), the deterioration determination can be performed with higher accuracy. In addition, the measurement result of this embodiment became a result different from the patent document 1 mentioned by background art.

  Based on the above, the memory 14 stores reflectance distribution data of new and aged products based on actual measurements shown in FIGS. 2 to 6 as comparison data, and the processing unit 13 is connected via the spectroscope 12. The actual reflectance data of the detection target electric wire 20 to be acquired is compared with the reflectance comparison data stored in the memory 14. The processing unit 13 determines whether the electric wire 20 to be detected is new or aged based on the comparison, and the aged product is approximate to the comparison data of each aged in the memory 14 or each aged. The age of the electric wire 20 to be detected is determined by complementing the comparison data and estimating the age. And the process part 13 alert | reports the age of the electric wire 20 of a detection target to a measurement person with a display apparatus etc. which are not shown in figure. A personal computer 15 is suitable as a device that includes a display device in addition to the processing unit 13 and the memory 14, but a device dedicated to wire deterioration detection may be configured.

  Incidentally, the comparison method in the processing unit 13 is not only a method of comparing the reflectance of all wavelengths subdivided in the wavelength range of 400 nm to 550 nm, 400 nm to 500 nm, and 400 nm to 460 nm, but also the wavelength subdivided in the same wavelength region. Comparison of the average values of all the reflectances, comparison of the average values of the reflectances of the wavelengths subdivided in the same wavelength range, excluding the abnormally prominent values, of the reflectances of the wavelengths subdivided in the same wavelength region There is a comparison of the minimum values. Further, the deterioration determination may be performed by limiting the specific wavelength with the reflectance of the single wavelength, or with the reflectance of two or more wavelengths.

Next, characteristic effects of the present embodiment will be described.
(1) The degree of deterioration of the detection target electric wire 20 is determined by analyzing the reflectance in the wavelength region of 400 nm to 550 nm or 400 nm to 500 nm in the reflected light that is applied to the detection target electric wire 20. In other words, the reflectance in this wavelength region greatly decreases as the detection target electric wire 20 progresses, so that the degree of deterioration of the detection target electric wire 20 can be detected with high accuracy.

  (2) If the deterioration degree is determined based on the analysis of the reflectance in the wavelength range of 400 nm to 460 nm that decreases uniformly in proportion to the aging of the electric wire 20 to be detected in the reflected light, the deterioration detection of the electric wire 20 is detected. Can be performed with higher accuracy.

(3) If the reflectance in the wavelength region of 550 nm to 700 nm is further considered and analyzed, the deterioration of the electric wire 20 can be detected with higher accuracy.
In addition, you may change the said embodiment as follows.

  Although the light source 11 that emits white light including at least the wavelength region of 400 nm to 700 nm is used, the emitted light is not limited to this. For example, when analyzing the reflectance in the wavelength range of 400 nm to 550 nm, the light source may emit light including the wavelength range of 400 nm to 550 nm (not necessarily white light). That is, the wavelength range of light emitted from the light source side may be changed as appropriate in accordance with the wavelength range for analyzing the reflectance.

-The coating | coated part 20a of the electric wire 20 may be insulating materials other than a vinyl-type insulating material.
-Coloring of the coating | coated part 20a of the electric wire 20 may be other than yellow.
-The use of the electric wire 20 may be other than the control wiring arranged in the control panel of the receiving / transforming equipment.

  ・ As a method for comparing reflectance, comparison of all data in the above-mentioned predetermined wavelength range, comparison of average values, comparison of average values excluding abnormal protruding values, comparison of minimum values are examples, and other methods are used. It may be used.

  -As the detection of the degree of deterioration (age) of the electric wire 20 to be detected, the age may be determined from the data closest to the data of each age stored in the memory 14, and the stored age You may make it determine aged more finely by complementing a space | interval.

  FIG. 7 shows an example of deterioration determination different from the above. In the electric wire 20 to be detected this time, the reflectance of a new product in the wavelength region of 400 nm to 700 nm is 100%, and the completely deteriorated product in the same wavelength region (for example, the elongation at break of the covering portion 20a is less than 100%) ) Was measured. Incidentally, in the standard JIS_C3316 “Vinyl insulated electric wire for electrical equipment”, “100% or higher breaking elongation” is required as the electric wire specification. In other words, when the breaking elongation is less than 100%, the electric wire is out of specification and is a deteriorated product. In such a completely deteriorated product, the reflectance is approximately constant at about 85% in the wavelength region of 400 nm to 450 nm, and the reflectance gradually decreases from about 85% in the wavelength region of 450 nm to 540 nm, and the lowest value is about 540 nm. It became 75%. In the wavelength range of 540 nm to 700 nm, the reflectance gradually increased from about 75% to about 100% at 700 nm.

  For example, when the degree of deterioration of the electric wire 20 is detected, the reflectance is 90% or less (the maximum value of the reflectance is 90% or less) in the wavelength region of 400 nm to 500 nm, or the average of the reflectances. When the value is 90% or less, it is determined that the electric wire 20 has been deteriorated. Therefore, the degradation-in-progress electric wire in FIG. 7 exceeds 90% in the wavelength range of 400 nm to 500 nm, so it is determined as a non-degraded product, and it is determined that subsequent use is possible.

  It should be noted that the wavelength range for detecting the degree of deterioration may be 400 nm to 550 nm. Also in this aspect, the reflectance in the wavelength region of 550 nm to 700 nm may be further added to the deterioration determination. Further, the reflectance 90% is set as the deterioration determination value of the electric wire 20, but may be set to other values in consideration of, for example, the material and color of the electric wire 20 (covering portion 20a). Alternatively, the determination value may be set individually for each wavelength of the minimum unit, and the deterioration determination may be performed by comparison for each wavelength.

Next, a technical idea that can be grasped from the above embodiment and another example will be added below.
(A) In the wire coating deterioration detection method according to claim 5,
A method for detecting deterioration of electric wire covering, comprising: performing deterioration degree determination based on analysis of reflectance in a wavelength region of 400 nm to 500 nm in the reflected light.

(B) In the electric wire covering deterioration detection method as described in (a) above,
A method for detecting deterioration of electric wire covering, comprising: performing deterioration degree determination based on analysis of reflectance in a wavelength region of 400 nm to 460 nm in the reflected light.

(C) In the wire covering deterioration detection method according to any one of claims 5 and (a) and (b) above,
A method of detecting deterioration of electric wire covering, wherein the deterioration degree is determined by further taking into account the reflectance in a wavelength region of 550 nm to 700 nm in the reflected light.

  12 ... Spectroscope, 13 ... Processing unit (determination unit), 20 ... Electric wire.

Claims (5)

This is a wire covering deterioration detection device that applies light to a detection target wire and divides the reflected light with a spectroscope and detects the deterioration degree of the detection target wire based on the subdivided reflectance for each wavelength. And
An electric wire covering deterioration detection apparatus comprising a determination unit for determining a deterioration degree of the electric wire to be detected based on an analysis of reflectance in a wavelength region of 400 nm to 550 nm in the reflected light. In the electric wire covering deterioration detecting device according to claim 1,
The determination unit is configured to perform a deterioration degree determination based on an analysis of reflectance in a wavelength region of 400 nm to 500 nm in the reflected light. In the electric wire covering deterioration detecting device according to claim 2,
The determination unit performs a deterioration degree determination based on an analysis of reflectance in a wavelength region of 400 nm to 460 nm in the reflected light. In the electric wire covering deterioration detection device according to any one of claims 1 to 3,
The electric wire covering deterioration detection apparatus, wherein the determination unit performs a deterioration degree determination in consideration of a reflectance in a wavelength region of 550 nm to 700 nm in the reflected light. This is a wire covering deterioration detection method in which light is applied to a detection target wire and the reflected light is dispersed by a spectroscope and the deterioration degree of the detection target wire is detected based on the subdivided reflectance for each wavelength. And
An electric wire covering deterioration detection method, wherein the deterioration degree of the electric wire to be detected is determined based on an analysis of reflectance in a wavelength region of 400 nm to 550 nm in the reflected light.