JP2019215230A - Electric wire coating deterioration detector and electric wire coating deterioration detection method - Google Patents

Abstract

To provide an electric wire coating deterioration detector and an electric wire coating deterioration detection method, capable of securing diagnostic accuracy of deterioration degree including excessive fouling of an electric wire to be tested.SOLUTION: When the deterioration degree of an electric wire 2 to be tested is detected, a deterioration diagnosis unit 12 irradiates a light source 6 with light, and splits the reflected light by a spectroscope 7 to obtain a reflectance of each wavelength. At this time, the deterioration diagnosis unit 12 determines whether or not the electric wire 2 to be tested is excessively fouled, based on the reflectance of 750 nm in a wavelength band not affected by the deterioration. The deterioration diagnosis unit 12 performs deterioration diagnosis on the electric wire 2 that has not been determined to be excessively fouled.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electric wire coating deterioration detecting device and an electric wire coating deterioration detecting method for detecting the presence or absence of electric wire deterioration.

  2. Description of the Related Art Conventionally, control wiring (electric wires) routed to a control panel or the like of a power receiving and transforming facility may not properly transmit a control signal through its own wiring as its covering part deteriorates over time. . This also leads to the cause of malfunction of the power equipment of the substation facility. Therefore, in order to prevent a malfunction or the like of a power device, a degree of deterioration of a control wiring is detected.

  As a method of detecting the degree of deterioration of the control wiring, the control wiring to be inspected is irradiated with white light, the reflected light is received and separated by a spectroscope. A method of detecting a deterioration state of a control wiring from a difference in reflectance at a wavelength is well known (see Patent Document 1 and the like).

JP 20117662 A

  By the way, when fats and oils adhere to the control wiring due to the influence of the installation environment, the adhered substance may penetrate into the coating of the control wiring. In this case, even if the surface of the coating portion is cleaned, the surface is not cleaned, resulting in excessive contamination. Excessive fouling of the coating results in a lower overall light reflectance than a new one. For this reason, in the case of an excessively soiled product, the relationship between the reflectance between the new product and the deteriorated product is not satisfied, and there is a problem that the conventional method for detecting the degree of deterioration cannot detect the excessively soiled product. Thus, there is a need to improve the detection accuracy.

  An object of the present invention is to provide a wire coating deterioration detecting device and a wire coating deterioration detecting method which can ensure the accuracy of diagnosis of a degree of deterioration including excessive contamination of a wire to be inspected.

  The wire coating deterioration detecting device that solves the above problem irradiates the inspection target wire with light, splits the reflected light with a spectroscope, and based on the reflectance of each wavelength after the splitting, based on the reflectance of the inspection target wire. And a reflectance of a first wavelength band correlated with the degradation of the inspection target wire, and a reflectance of a second wavelength band complementary to the first wavelength band. And a deterioration diagnostic unit for detecting the degree of deterioration of the electric wire to be inspected based on the reflectivity ratio, and the deterioration diagnostic unit is affected by deterioration when determining the degree of deterioration. Based on the reflectance of the wavelength band that does not exist, the detection of excessive contamination of the inspection target electric wire is performed.

  According to this configuration, it is possible to detect not only the degree of deterioration of the electric wire to be inspected but also the detection of excessive contamination. Therefore, it is possible to ensure the accuracy of diagnosing the degree of deterioration including excessive contamination of the electric wire to be inspected.

  In the wire covering deterioration detecting device, it is preferable that the deterioration diagnosing unit detects the excessive contamination based on the reflectance in the second wavelength band. According to this configuration, it is possible to detect excessive contamination of the electric wire by using the reflectance of the second wavelength band used when detecting the degree of deterioration of the electric wire to be inspected.

  In the wire covering deterioration detecting device, the deterioration diagnosis unit executes a process of detecting excessive contamination multiple times for one sample of the wire to be inspected based on the reflectance in a wavelength band not affected by the deterioration. When the number of times of detection of excessive contamination exceeds a specified value, it is preferable to determine that the sample is excessively soiled. According to this configuration, the sample is determined to be an excessively contaminated product only when the result that the reflectance in the wavelength band not affected by the deterioration has a value that can be determined to be excessively contaminated is generated a plurality of times. Therefore, it is possible to accurately obtain a determination result as to whether or not the wire to be inspected is an excessively soiled product.

  In the electric wire covering deterioration detecting device, it is preferable that, when it is determined that the sample of the electric wire to be inspected has no excessive contamination, the deterioration diagnosis unit performs the determination of the degree of deterioration for the sample. . According to this configuration, the determination of the degree of deterioration is performed only on the sample for which no excessive contamination has been detected.

  The wire coating deterioration detection method for solving the above problems is to irradiate the inspection target wire with light, split the reflected light with a spectroscope, and based on the reflectance of each wavelength after the splitting, the inspection target wire. A reflectance of a first wavelength band correlated with the degradation degree of the inspection target wire, and a reflectance of a second wavelength band having a complementary color relationship with the first wavelength band. Calculate the reflectance ratio of the inspection target wire based on the reflectance ratio, based on the reflectance ratio, when determining the degree of degradation, based on the reflectance of a wavelength band that is not affected by the degradation, Detects excessive contamination of the inspection target wire.

  ADVANTAGE OF THE INVENTION According to this invention, the diagnostic accuracy of the deterioration degree containing the excessive contamination of the electric wire under test can be ensured.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram of the electric wire coating deterioration detection apparatus of one Embodiment. The waveform diagram which shows the reflectance measurement result of a thermally deteriorated electric wire coating. FIG. 4 is a characteristic diagram showing a reflectance ratio-elongation at break curve of a thermally deteriorated electric wire coating. The waveform diagram which shows the comparison spectrum of a new article and an excessively soiled product. FIG. 4 is a characteristic diagram showing a relationship between a reflectance ratio of an excessively soiled product and an elongation at break. The waveform diagram which shows the measurement result of the reflectance of the new electric wire covering. The waveform diagram which shows the reflectance measurement result of the excessively soiled product electric wire coating. 9 is a flowchart executed when determining the degree of deterioration and excessive contamination.

Hereinafter, an embodiment of an electric wire coating deterioration detecting apparatus and an electric wire coating deterioration detecting method will be described with reference to FIGS.
As shown in FIG. 1, an electric wire coating deterioration detecting device 1 is a device for diagnosing electric wire 2 coating deterioration. By the way, as an index of electric wire coating deterioration, there is elongation at break (elongation at break [%]) described in JIS standards. The breaking elongation refers to the elongation at the time of cutting when the wire coating (wire 2) having the reference length L0 is pulled. The breaking elongation is represented by an equation of “breaking elongation = ((L1−L0) / L0 × 100)” where L1 is the length at the time of cutting. If the elongation is less than 100%, for example, the electric wire 2 becomes non-compliant (deteriorated).

  In general, when the wire 2 deteriorates, the elongation at break decreases. For example, if the elongation at break of the initial product is about 250%, the elongation at break decreases from 250 → 200 → 150 → 100% due to deterioration progress. Therefore, the breaking elongation is a numerical value that decreases as the degree of deterioration of the electric wire coating increases, and has a correlation with the degree of deterioration of the electric wire coating. This breaking elongation has a correlation with the reflectance of the surface of the electric wire coating. Therefore, the wire-covering deterioration detecting device 1 quantifies the breaking elongation, that is, the degree of deterioration of the wire 2 from the correlation between the reflectance of the wire-covering surface and the breaking elongation (reflectance-breaking elongation curve).

  The electric wire 2 is, for example, a vinyl insulated electric wire (JIS_C3316) for electric equipment used for control wiring and the like arranged in a control panel of a substation facility. The electric wire 2 has a coating 3 made of a vinyl-based insulating material. The color of the covering portion 3 is, for example, yellow, which is frequently used for electric equipment. As the colorant of the coating portion 3, for example, an azo pigment is used. Here, “vinyl insulated wires for electric equipment” of the standard JIS_C3316 requires “elongation at break of 100% or more” as the wire specification, while wires with “elongation at break of less than 100%” are out of specification. It becomes a nonconforming product (completely deteriorated product).

  The electric wire coating deterioration detecting device 1 includes a light source 6 that irradiates light to the electric wire 2 to be inspected, a spectrometer 7 that measures a wavelength range of reflected light from the electric wire 2, and each wavelength band measured by the spectrometer 7. And a memory 9 that stores determination data Db used in the deterioration diagnosis of the electric wire 2 based on the reflectance data Da.

  The light source 6 is a white light source that emits light (white light) in a wavelength range of 300 to 1200 nm, for example. The light source 6 irradiates the electric wire 2 to be inspected with white light. The white light applied to the electric wire 2 is reflected on the surface of the covering portion 3 of the electric wire 2, and the reflected light is incident on the spectroscope 7.

  The spectroscope 7 measures light in a wavelength range of, for example, 300 to 1200 nm. The spectroscope 7 of the present embodiment disperses the incident light (reflected light) in a wavelength range of 300 to 1200 nm, for example, at predetermined wavelengths (for example, 10 nm), and determines the intensity of the reflected light of each wavelength subdivided by the spectroscopy. Measure.

  The control unit 8 includes, for example, a CPU (Central Processing Unit) and receives reflectance data Da of each wavelength band input from the spectroscope 7. The control unit 8 includes a deterioration diagnosis unit 12 that diagnoses the degree of deterioration of the electric wire 2 (the covering unit 3) based on the reflectance data Da input from the spectroscope 7. The deterioration diagnosis unit 12 performs the deterioration diagnosis of the electric wire 2 based on the reflectance data Da of the reflected light input from the spectroscope 7 and using the determination data Db stored in the memory 9. It is preferable that the determination data Db is, for example, an approximate curve C indicating a correlation between the reflectance and the elongation at break.

  FIG. 2 shows the measurement results of the reflectance of the heat-degraded wire coating. As shown in the figure, when reflectance measurement is performed using a deteriorated electric wire, the reflectance in a predetermined wavelength range is reduced according to the deterioration state (decrease in elongation at break). In the case of FIG. 2, for example, the reflectance in the wavelength region of 500 to 700 nm is reduced. FIG. 2 is a reflection spectrum of heat-degraded electric wires (accelerated heat-degraded electric wires) having different degrees of deterioration (elongation at break). Although FIG. 2 shows the reflectance wavelength range in the necessary wavelength range, the reflectance data Da actually exists in the wavelength band according to the performance of the spectroscope 7.

  Here, as shown in FIG. 2, it can be seen that in a specific wavelength band, there is a wavelength range in which the reflectance of the deteriorated wire greatly differs from the reflectance of the new wire. In the case of the drawing, for example, in a wavelength band of 540 to 580 nm (hereinafter, referred to as a first wavelength band λ1), the reflectance largely changes between the new electric wire and the deteriorated electric wire. Therefore, in the case of this example, the change in the reflectance of the first wavelength band λ1 is used as an index of the deterioration of the electric wire 2.

  By the way, in the wavelength band of the reflectance data Da, there is a band in which the reflectance does not decrease (hereinafter, referred to as a second wavelength band λ2) even though the first wavelength band λ1 in which the reflectance decreases exists. In the case of this example, the second wavelength band λ2 is a wavelength band having a complementary color relationship with the first wavelength band λ1, and is 740 to 780 nm. In this example, a new product or a deteriorated product is identified using the specificity of the change in the first wavelength band λ1 and the second wavelength band λ2. In determining whether a product is new or deteriorated, the slope (base line) of the spectrum that differs for each measurement sample is determined by calculating the ratio (reflection ratio: λ2 / λ1) of the first wavelength band λ1 and the second wavelength band λ2. to correct. This avoids the effects of measurement errors.

  Furthermore, in order to mitigate the influence of the singular peak due to noise when calculating the reflection ratio, an average value of each of the first wavelength band λ1 and the second wavelength band λ2 is obtained, and deterioration diagnosis is performed. Specifically, the reflectance average of the first wavelength band λ1 (540 to 580 nm) is “λ1R”, the reflectance average of the second wavelength band λ2 (740 to 780 nm) is λ2R, and the reflectance of the accelerated heat-degraded wire is The ratio R1 (= λ2R / λ1R) is calculated. As described above, the deterioration diagnosis unit 12 of the present example obtains the reflectance ratio R1 (λ2R / λ1R) calculated from the reflectance average, and executes the deterioration diagnosis of the electric wire 2.

  FIG. 3 shows the correlation between the reflectance ratio R1 and the elongation at break. As shown in the figure, when the reflectance ratio R1 has a low value, the elongation at break increases. In this case, it can be determined that the electric wire 2 is normal. On the other hand, when the reflectance ratio R1 takes a high value, the elongation at break decreases. In this case, it can be determined that the electric wire 2 has deteriorated. Thus, the deterioration diagnosis of the electric wire 2 is performed from the value of the reflectance ratio R1.

  FIG. 4 shows a comparison spectrum of each reflectance of the new electric wire and the excessively soiled electric wire. The excessively soiled electric wire is, for example, an electric wire in which oil or the like adheres to the surface of the covering portion 3 and dirt penetrates into the inside. Depending on the installation environment, there is a possibility that grease or the like may adhere to the wire 2. In this case, if grease or the like penetrates into the inside of the coating portion 3, the surface of the wire 2 is cleaned even before the measurement. May be excessively soiled. The excessively stained electric wire has a lower reflectance than the new electric wire as a whole, and a difference occurs in the slope (base line) of the spectrum.

  Further, as shown in FIG. 5, the reflectance ratio R1 normally takes a value in the range of about 1.35 to 1.50, whereas the excessively soiled product has not deteriorated (for example, the elongation at break). (Degree of 255%) shows 1.81 which exceeds the standard nonconformity value (about 1.5). As described above, in the case of the excessively soiled electric wire, the relationship between the reflectance ratio R1 and the breaking elongation is not established. This example is a measure against this problem.

  FIG. 6 shows a reflectance spectrum when reflectance measurement is performed a plurality of times (N = 10) with a new electric wire. The reflectance at 720 nm in the second wavelength band λ2, which is not affected by the electric wire deterioration, is observed with good reproducibility. At this time, the lowest observed value is 191%. The average value of the reflectance ratio R1 of the new electric wire for ten times is 1.32.

  FIG. 7 shows a reflectance spectrum when the reflectance measurement is performed a plurality of times (N = 10) on the excessively soiled electric wire. The reflectance of the excessively stained electric wire takes a relatively low value with respect to the new electric wire. In addition, the reflectance at 750 nm of the excessively soiled electric wire is 176% at the highest measured value. That is, in the case of the excessively soiled product, the reflectance remains low in the second wavelength band λ2 which is not affected by the deterioration. As described above, the deterioration diagnosis unit 12 of the present example utilizes the difference in the reflectance between the new electric wire and the excessively contaminated electric wire in the second wavelength band λ2 that is not affected by the deterioration, and determines whether the electric wire 2 is excessively contaminated. Determine whether or not.

Next, the operation and effect of the electric wire coating deterioration detecting device 1 of the present embodiment will be described with reference to FIGS. 2, 3, and 6 to 8.
In step 101 of FIG. 8, the measurer heats an electric wire of the same type as the electric wire 2 to be inspected in a constant temperature bath at about 100 ° C., and prepares a plurality of types of heat-degraded electric wires (samples having different heating times). ). As a result, the wire is accelerated and degraded by heat, and a plurality of types of samples having different breaking elongations are created. Here, the “electric wire of the same type as the electric wire 2” includes not only an electric wire completely identical to the electric wire 2 but also an electric wire substantially the same as the electric wire 2. Further, the heat treatment in this example may be performed at a temperature setting other than 100 ° C.

  The sample of this example includes a sample 1 that is a new electric wire, a sample 2 that has been subjected to a heat deterioration of 20 days, a sample 3 that has been subjected to a heat deterioration of 30 days, and a sample 4 that has been subjected to a heat deterioration of 40 days. There is a sample 5 which has been subjected to a heat deterioration of 60 days, a sample 6 which has been subjected to a heat deterioration of 90 days, and a sample 7 which has been subjected to a heat deterioration of 100 days. These samples 1 to 7 are heat-degraded electric wires.

  In step 102, the wire coating deterioration detecting device 1 measures the elongation at break and the reflectance of each of the samples 1 to 7. As a result of measurement of the elongation at break of each of the samples 1 to 7, the result that the elongation at break decreases as the heating time (thermal deterioration time) increases.

  In measuring the reflectivity, the deterioration diagnosis unit 12 of the electric wire coating deterioration detection device 1 first irradiates the samples 1 to 7 with white light having a wavelength of about 300 to 1200 nm from the light source 6. The reflected lights of the samples 1 to 7 are incident on the spectroscope 7, and the reflectance data Da corresponding to the amount of reflected light is output to the control unit 8. The deterioration diagnosis unit 12 acquires the reflectance data Da measured by the spectroscope 7.

  As shown in FIG. 2, it can be confirmed from the measurement results of the reflectance of the thermally deteriorated electric wire coating that the reflectivity in the wavelength band of 500 to 700 nm decreases with the deterioration of the electric wire coating, that is, the decrease in the elongation at break. In particular, it can be seen that the reflectance significantly decreases in the wavelength band of 540 to 580 nm.

  Returning to FIG. 8, in step 103, the deterioration diagnosing unit 12 selects a first wavelength band λ1 and a second wavelength band λ2 which are indicators of wire coating deterioration. Here, apart from the reflectance measurement described above, each sample 1 to 7 was subjected to chemical analysis and color evaluation using a color difference meter. From the results of these chemical analysis and color evaluation, the following became clear. First, it was clarified that the decrease in the breaking elongation was caused by a decrease in the amount of the plasticizer constituting the covering portion 3 of the electric wire 2. In addition, it became clear that the pigment (here, an azo pigment) constituting the coating portion 3 also changed in parallel with the decrease in the plasticizer. Further, based on the reflectance distribution, the chemical analysis result and the color evaluation result, the reflectance of the green wavelength (wavelength band of 540 to 580 nm) decreases with the change of the azo pigment, and the red wavelength which is complementary to the green color. (A wavelength band of 740 to 780 nm) was found to increase. Furthermore, it was also found that there is a correlation between the degree of decrease in reflectance at the green wavelength (wavelength band of 540 to 580 nm) and the degree of increase in reflectance at the red wavelength (wavelength band of 740 to 780 nm). . That is, the lower the elongation at break due to deterioration of the electric wire coating, the lower the reflectance at the green wavelength, while the lower the elongation at break, the higher the reflectance at the red wavelength. This also indicates that the ratio (reflectance ratio) between the reflectance at the green wavelength and the reflectance at the red wavelength has a correlation with the elongation at break.

  Based on this, the deterioration diagnosis unit 12 selects a wavelength band (wavelength band of 540 to 580 nm in this example) correlated with the elongation at break (degree of deterioration) as the first wavelength band λ1, and this first wavelength band A wavelength band complementary to λ1 (in this example, a wavelength band of 740 to 780 nm) is selected as the second wavelength band λ2. More specifically, in the case of this example, a wavelength band in which a decrease in elongation at break due to a decrease in the plasticizer and a change in tint (here, a decrease in green color) due to a change in the azo pigment is defined as a first wavelength band λ1. The second wavelength band λ2 is selected as a second wavelength band λ2 which has a complementary color relationship with the first wavelength band λ1 and whose reflectance changes (increases here) as the breaking elongation decreases. As described above, the first wavelength band λ1 and the second wavelength band λ2 are selected based on the reflectance distribution, the chemical analysis result, and the color evaluation result. The deterioration diagnosis unit 12 stores data indicating the range of the selected first wavelength band λ1 and the selected second wavelength band λ2 in the memory 9.

  In step 104, the deterioration diagnosis unit 12 calculates the reflectance ratio R1 for each of the samples 1 to 7. In the case of this example, the deterioration diagnosis unit 12 calculates, for each of the samples 1 to 7, λ1R which is the average of the reflectances of all the wavelengths subdivided in the first wavelength band λ1 of 540 to 580 nm, and the second of 740 to 780 nm. A reflectance ratio R1 (= λ2R / λ1R), which is a ratio with respect to λ2R, which is an average of reflectances of all the wavelengths subdivided in the wavelength band λ2, is calculated.

In step 105, the deterioration diagnosis unit 12 calculates an approximate curve C indicating a correlation between the breaking elongation and the reflectance ratio R1.
As shown in FIG. 3, in the case of the present example, the deterioration diagnosis unit 12 plots the data of each of the samples 1 to 7 on a graph in which the horizontal axis represents the reflectance ratio R1 and the vertical axis represents the breaking elongation. . Then, the deterioration diagnosis unit 12 calculates the equation of the approximate curve C, that is, the deterioration prediction equation “y = f (x)” from the plotted data. In this deterioration prediction equation, “y” is the elongation at break, and “x” is the reflectance ratio R1. Thus, the breaking elongation can be calculated as a function of the reflectance ratio R1. Note that the deterioration prediction formula can be derived by, for example, the least square method. The deterioration diagnosis unit 12 stores the calculated deterioration prediction formula in the memory 9. As a result, the preparation before performing the deterioration diagnosis of the covering portion 3 of the electric wire 2 is completed.

  Returning to FIG. 8, in step 106, before the deterioration diagnosis, the deterioration diagnosis unit 12 first checks whether or not the sample product (the electric wire 2) set as the target of the deterioration diagnosis is an excessively contaminated product. Start the contamination diagnosis. In the overfouling diagnosis of the present example, for example, for each sample, a process of detecting overfouling based on the reflectance of the second wavelength band λ2 which is not affected by deterioration is executed a plurality of times (N times). In the case of this example, it is assumed that the excessive contamination diagnosis is performed “10” times for one sample (see FIGS. 6 and 7). First, in the case of the first measurement, the counter N for the number of times of excessive contamination determination is set to “0”, and ERR is set to “0”.

  In step 107, the deterioration diagnosis unit 12 measures the reflectance of the inspection target electric wire 2. That is, the deterioration diagnosis unit 12 irradiates the electric wire 2 with white light from the light source 6 to reflect the light, and acquires the reflectance data Da from the spectroscope 7 to which the reflected light is input.

  In step 108, the deterioration diagnosis unit 12 determines whether or not the product is excessively contaminated based on the reflectance of the wavelength band (λ2 in this example) used for the determination of excessive contamination. In the case of this example, it is determined whether the reflectance of one value (750 nm) of the second wavelength band λ2 that is not affected by the deterioration is equal to or less than a specified value (for example, 180%). If the reflectance of one value (750 nm) of the second wavelength band λ2 is not less than the specified value, the process proceeds to step 109, and if the reflectance of one value (750nm) of the second wavelength band λ2 exceeds the specified value, the process proceeds to step 114. Transition.

In step 109, the deterioration diagnosing unit 12 counts up the counter N to “N + 1” unless the reflectance of one value (750 nm) of the second wavelength band λ2 is equal to or less than the specified value.
In step 110, the deterioration diagnosis unit 12 stores the measured reflectance data Da in a memory.

  In step 111, after storing the reflectance data Da, the deterioration diagnosis unit 12 determines whether or not the counter N for the number of times of excessive contamination determination has reached “10”. That is, it is determined whether or not the number of times of excessive soil determination has been performed ten times. If the number of times of excessive soiling determination is less than 10, the process returns to step 107, and the determination as to whether the product is excessively soiled is performed again. On the other hand, when the number of times of the determination of excessive contamination reaches 10, the electric wire 2 to be inspected is not an excessively dirty product, and the process proceeds to step 112.

In step 112, the deterioration diagnosing unit 12 calculates the reflectance ratio R1 for the electric wire 2 that has been diagnosed as not excessively soiled.
In step 113, the deterioration diagnosis unit 12 detects the degree of deterioration of the inspection target electric wire 2 based on the calculated reflectance ratio R1. The deterioration diagnosis unit 12 of the present example checks the position of the calculated reflectance ratio R1 in the determination data Db (approximate curve C) stored in the memory 9 to determine the breaking elongation of the electric wire 2. calculate. Then, the deterioration diagnosis unit 12 detects (estimates) the degree of deterioration of the electric wire 2 based on the calculated elongation at break, and notifies the measurer of the degree of deterioration using a display device or the like.

  Incidentally, the breaking elongation of the electric wire 2 has a correlation with the deterioration degree of the electric wire 2. Therefore, the degree of deterioration of the electric wire 2 can be easily estimated from the determined elongation of the electric wire 2. If the calculated elongation is less than 100%, the deterioration diagnosis unit 12 notifies that the electric wire 2 to be inspected is a non-compliant product. In addition, the deterioration diagnosis unit 12 may not directly estimate the breaking elongation of the electric wire 2 calculated based on the deterioration prediction formula as the deterioration degree without estimating the deterioration degree of the electric wire 2.

  In step 114, when the reflectance of one value (750 nm) of the second wavelength band λ2 exceeds the specified value, the deterioration diagnosis unit 12 counts up the error counter ERR to “ERR + 1”.

  In step 115, the deterioration diagnosis unit 12 discards the measurement data (reflectance data Da) in which an error has occurred after counting up the counter ERR. That is, the deterioration diagnosing unit 12 does not use the reflectance data Da having an error in the excessive contamination diagnosis as the data of the deterioration diagnosis determination.

  In step 116, the deterioration diagnosis unit 12 determines whether or not the error measurement counter ERR has reached “5”. At this time, if the error measurement counter ERR has not reached “5”, the process proceeds to step 111 to check the number of times of excessive contamination determination. On the other hand, if the error measurement counter ERR has reached “5”, the process proceeds to step 117.

  In step 117, the deterioration diagnosis unit 12 determines that the inspection target electric wire 2 is an excessively soiled sample. At this time, the deterioration diagnosis unit 12 discards the measurement data (reflectance data Da) stored in the memory 9 at the time of the deterioration diagnosis. When the deterioration diagnosis unit 12 determines that the inspection target electric wire 2 is an excessively soiled sample, the deterioration diagnosis unit 12 notifies the measurement person using a display device or the like. Therefore, it is possible to eliminate the excessively stained electric wire 2.

  By the way, in the case of the present example, the electric wire coating deterioration detecting device 1 includes the reflectance of the reflected light (the reflectance of the first wavelength band λ1 and the reflectance of the second wavelength band λ2) when light is applied to the electric wire 2 to be inspected. A deterioration diagnosis unit 12 capable of diagnosing the degree of deterioration based on a reflectance ratio (reflectance to reflectance) is provided. When determining the degree of deterioration, the deterioration diagnosis unit 12 detects excessive contamination of the inspection target electric wire 2 based on the reflectance of the second wavelength band λ2 which is not affected by the deterioration. As described above, in the present embodiment, not only the degree of deterioration of the electric wire 2 to be inspected but also the detection of excessive contamination can be detected. Therefore, it is possible to ensure the accuracy of diagnosing the degree of deterioration including excessive contamination of the electric wire 2 to be inspected.

  The deterioration diagnosis unit 12 detects excessive contamination based on the reflectance of the second wavelength band λ2. Therefore, it is possible to detect excessive contamination of the electric wire 2 by using the reflectance of the second wavelength band λ2 used when detecting the degree of deterioration of the electric wire 2 to be inspected.

  The deterioration diagnosing unit 12 performs a plurality of times of processing for detecting over-contamination on one sample of the electric wire 2 to be inspected based on the reflectance of the second wavelength band λ2 which is not affected by the deterioration (in this example, N = 10), and when the number of times of detection of excess contamination exceeds a specified value (ERR = 5 times), the sample is determined to be excessively dirty. In this case, the sample is regarded as an excessively contaminated product only when the result that the reflectance in the wavelength band (λ2: 750 nm) not affected by the deterioration becomes a value (180% or less) that can be determined to be excessively contaminated multiple times. Is determined. Therefore, it is possible to accurately obtain a determination result as to whether or not the electric wire 2 to be detected is excessively soiled.

  When it is determined that the sample of the electric wire 2 to be inspected is not excessively contaminated, the deterioration diagnosis unit 12 determines the degree of deterioration of the sample. Therefore, the determination of the degree of deterioration is performed only on the sample for which no excessive contamination has been detected, so that the determination of the degree of deterioration does not need to be performed wastefully.

This embodiment can be implemented with the following modifications. The present embodiment and the following modifications can be implemented in combination with each other within a technically consistent range.
The wavelength of the light to be diagnosed in the excessive contamination diagnosis is not limited to 750 nm, and may be changed to another wavelength according to the electric wire 2 to be inspected.

-The overfouling diagnosis may be performed using, for example, the reflectance of a plurality of wavelengths.
The wavelength to be diagnosed in the excessive contamination diagnosis is not limited to 750 nm, and may be defined in a ratio based on, for example, a new value.

-The overfouling diagnosis is not limited to being performed at one point value of 750 nm. For example, the average value or the weighted average of several wavelength points before and after may be used.
The excessive contamination diagnosis may be a process of determining based on, for example, the entire slope of the reflectance spectrum (approximate curve (approximate expression)), like the process of the deterioration diagnosis.

The over-fouling diagnosis and the deterioration diagnosis are not limited to being performed continuously in one processing step, and may be performed in different steps.
-The reflectance ratio R1 is not limited to the value obtained from the average value of the reflectance. For example, a value obtained from the maximum value or the minimum value of the reflectance in the wavelength band may be used. Alternatively, it may be a value obtained by using the reflectance of a predetermined wavelength in the wavelength band. Further, the reflectance ratio R1 may be calculated from the value excluding the abnormal reflectance.

  The light source 6 is not limited to a white light source. For example, when the first wavelength band λ1 is set to a band of 540 to 580 nm and the second wavelength band λ2 is set to 740 to 780 nm, the light source 6 can emit light of these wavelength bands. Good.

-The light of the light source 6 may be other than white light.
-The covering part 3 of the electric wire 2 may use a material other than the vinyl-based insulating material. At this time, the colorant added to the material of the coating portion 3 may be other than the azo pigment. As described above, when the insulating material and the wire color of the covering portion 3 are changed, the first wavelength band λ1 and the second wavelength band λ2 are changed in accordance with the change, and the deterioration prediction formula is also changed.

  The determination data Db is not limited to the approximate curve C (deterioration prediction formula). For example, the actual measurement value data of the elongation at break and the reflectance ratio R1 may be stored in the memory 9 as it is, and the deterioration diagnosis may be performed using the data group.

-The sample of deterioration and over-contamination is not limited to the heat-deteriorated electric wire, but may be an electric wire generated by changing the preparation method.
The parameter representing the deterioration is not limited to the elongation at break, but may be changed to other parameters such as, for example, the breaking strength (tensile strength), the water content of the coating 3, and the insulation resistance of the coating 3.

  -The use of the electric wire 2 may be other than the control wiring arranged on the control panel of the substation equipment.

  DESCRIPTION OF SYMBOLS 1 ... Electric wire coating deterioration detection apparatus, 2 ... Electric wire, 3 ... Coating part, 6 ... Light source, 7 ... Spectroscope, 12 ... Deterioration diagnosis part, λ1: First wavelength band, λ2: Second wavelength band.

Claims (5)

By irradiating the inspection target wire with light, the reflected light is separated by a spectroscope, and based on the reflectance of each wavelength after the splitting, based on the wire coating deterioration detection device that detects the degree of deterioration of the inspection target wire. So,
A reflectance ratio between a reflectance of a first wavelength band correlated with the degree of deterioration of the inspection target wire and a reflectance of a second wavelength band complementary to the first wavelength band is obtained. A deterioration diagnostic unit for detecting the degree of deterioration of the inspection target wire based on the
The degradation diagnosis unit is a wire coating degradation detection device that, when determining the degradation degree, detects excessive contamination of the wire to be inspected based on reflectance in a wavelength band that is not affected by degradation. 2. The wire covering deterioration detecting device according to claim 1, wherein the deterioration diagnosis unit detects the excessive contamination based on the reflectance in the second wavelength band. 3. The deterioration diagnosis unit executes a process of detecting excessive contamination multiple times on one sample of the wire to be inspected based on the reflectance in a wavelength band not affected by the degradation, and the number of times of detecting excessive contamination is reduced. The wire covering deterioration detecting device according to claim 1 or 2, wherein the sample is judged to be excessively stained when the value exceeds a specified value. The degradation diagnosis unit, when it is determined that there is no excessive contamination on a sample of the electric wire as an inspection target, performs the determination of the degree of degradation on the sample. 2. The wire covering deterioration detecting device according to claim 1. By irradiating the inspection target wire with light, the reflected light is separated by a spectroscope, and based on the reflectance of each wavelength after the splitting, based on the wire coating deterioration detection method for detecting the degree of deterioration of the inspection target wire. So,
A reflectance ratio between a reflectance of a first wavelength band correlated with the degree of deterioration of the inspection target wire and a reflectance of a second wavelength band complementary to the first wavelength band is obtained. The wire for detecting the degree of deterioration of the wire to be inspected based on the reflectance of a wavelength band not affected by the deterioration when detecting the degree of deterioration of the wire to be inspected based on the reflectance. Coating deterioration detection method.