JP5360082B2 - Deterioration diagnosis device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deterioration diagnostic device capable of easily and accurately diagnosing the degree of deterioration of an electric wire without requiring construction of an immense amount of data base. <P>SOLUTION: The deterioration diagnostic device comprises: a color chromaticity meter 5 for measuring colors by a Lab display system; a box body 10 with an opening to have an electric wire pass therethrough; a light source 11 provided in the box body 10; and a fixing device 12 for fixing the electric wire arranged in the box body 10 through the opening. When the color of a white insulating layer 3 of an unused electric wire fixed to the fixing device 12 is measured by the color chromaticity meter 5 in a state in which the light source 11 is made to emit light, the positional relation between components and the specification, etc. of the light source 11 are adjusted so that a value b is 0.5 or more and 3.0 or less. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

The present invention relates to a deterioration diagnosis apparatus that nondestructively diagnoses deterioration of electric wires (cables).

Patent Documents 1 and 2 below propose methods for nondestructively diagnosing the deterioration of electric wires (cables).
For example, in the method described in Patent Document 1, first, ultrasonic waves are transmitted to the insulating layer of the cable, and the propagation speed is detected. Then, the degree of deterioration of the cable is determined by comparing the detected propagation speed with the reference speed.

  In the method described in Patent Document 2, an impact body is caused to collide with an insulating layer or a sheath of a cable, and the surface hardness is detected from the speed of the impact body before and after the collision. And the deterioration degree of a cable is determined based on the change of the detected surface hardness.

  Patent Document 3 below proposes a method for detecting carbon dioxide and ozone generated from an insulating material as a non-destructive method for diagnosing deterioration of the insulating material.

Japanese Patent No. 3081734 Japanese Patent No. 3014947 JP-A-3-277118

  In wire and cable, the composition components of the insulating layer and the sheath differ depending on the manufacturer. For this reason, even if the same environmental load is given to an electric wire and a cable, the hardening of an insulating layer shows a different behavior for every manufacturer.

For these reasons, when determining the degree of deterioration of a cable by the methods described in Patent Documents 1 and 2, the determination criterion must be prepared for each cable manufacturer. For this reason, in order to perform the said determination, there existed a problem that a huge database had to be constructed | assembled and much time and an effort were required.
Further, when a new cable cannot be obtained for a certain manufacturer, the degree of deterioration cannot be determined for the cable of that manufacturer.

  The deterioration diagnosis method described in Patent Document 3 is also similar to the above, and lacks versatility.

The present invention has been made to solve the above-described problems, and its purpose is not to construct an enormous database, and it is possible to easily and accurately diagnose the degree of deterioration of electric wires. Is to provide a device .

A degradation diagnosis device according to the present invention includes a color measurement device for measuring color in a Lab display system, a box formed with an opening for passing an electric wire, a light source provided inside the box, an opening A fixing device for fixing the electric wire arranged inside the box through the color of the white insulating layer of the unused electric wire fixed to the fixing device in a state where the light source emits light. When the value of b is adjusted to be 0.5 or more and 3.0 or less when measured by the measuring device, and the color of the inner wall of the box is measured by the color measuring device with the light source emitted. , B are adjusted so that the value of b is smaller than 0 .

  According to this invention, it is not necessary to construct a huge database, the degree of deterioration of the electric wire can be diagnosed easily and accurately, and the reliability relating to the remaining life estimation can be improved.

It is the schematic which shows the structure of an electric wire sample. It is a principal part enlarged view of the electric wire sample shown in FIG. It is a figure for demonstrating the measuring method of color saturation. It is a figure which shows the structure of the deterioration diagnostic apparatus in Embodiment 1 of this invention. It is a figure for demonstrating the measuring method of the insulation resistance of an electric wire sample. It is a figure which shows the structure of the deterioration diagnostic apparatus in Embodiment 2 of this invention.

  In order to explain the present invention in more detail, it will be described with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

Embodiment 1 FIG.
First, based on FIG.1 and FIG.2, the structure of the electric wire sample used by this Embodiment is demonstrated. FIG. 1 is a schematic diagram showing the structure of an electric wire sample, and FIG. 2 is an enlarged view of a main part of the electric wire sample shown in FIG.

  The electric wire sample 1 is a vinyl insulated vinyl sheathed flat cable (VVF: Vinyl Insulated Flat-type cable). The electric wire sample 1 is obtained by further covering an electric wire obtained by coating a copper conductor 2 with an insulating layer 3 made of vinyl chloride with a sheath 4 made of vinyl chloride. The diameter (φ) of the conductor 2 is 1.6 mm or 2.0 mm, 2.6 mm. An electric wire sample 1 shown in FIG. 1 is a three-core VVF in which three electric wires of which the color of the insulating layer 3 is red (R), white (W), and black (B) are combined into one. An example of such a wire sample 1 is HST-SS30-3000C manufactured by Sumiden Hitachi Cable Co., Ltd.

  The specification of the electric wire is determined by JIS, and VVF is defined by JIS C 3342 and the like. Regarding the wire sample 1 used by the applicant this time, the specification is that the diameter of the conductor 2 is 1.6 mm or 2.0 mm and the thickness of the insulating layer 3 is 0.8 mm. When the maximum width (diameter) of the white insulating layer 3 was actually measured using calipers, the conductor 2 having a diameter of 1.6 mm was approximately 3.2 mm, and the conductor 2 having a diameter of 2.0 mm was approximately It was 3.6 mm. Moreover, when the diameter of the conductor 2 is 2.6 mm, the thickness of the insulating layer 3 is 1.0 mm. Also for this, when the maximum width (diameter) of the white insulating layer 3 was measured, the measured value was about 4.6 mm.

  FIG. 3 is a diagram for explaining a method of measuring color saturation. FIG. 3 shows a state when the color of the white insulating layer 3 of the wire sample 1 is measured using a general-purpose color chromaticity meter (color measurement device) 5.

  The color chromaticity meter 5 includes a measuring tool 6 and a power source / display device 7. The measurement tool 6 and the power source / display device 7 are connected by a connection cable 8. When measuring the color of the white insulating layer 3 with the color chromameter 5, first, the sheath 4 of the electric wire sample 1 having the above-described configuration is peeled off to expose the white insulating layer 3 over a predetermined length. Next, the exposed white insulating layer 3 is fixed to the jig 9. Then, the measurement tool 6 is appropriately brought into contact with the surface of the insulating layer 3 set on the jig 9, and a switch (not shown) of the power supply / display device 7 is pushed in this state. Then, light necessary for color measurement is transmitted from the power source / display device 7, and the light is applied to the surface of the insulating layer 3 from the measurement tool 6 via the connection cable 8. Part of the light emitted from the measurement tool 6 to the insulating layer 3 becomes reflected light and passes through the measurement tool 6 and the connection cable 8 and then is input to the power supply / display device 7. The power source / display device 7 calculates the color saturation based on the input reflected light and displays the calculation result on a predetermined display (not shown).

  The color display system includes (L, a, b), (L, C, H), Munsell, (Dx, y, z), (Y, x, y), and the like. In the present embodiment, a Lab display system with small variations (L (larger value is brighter, smaller darker), a (larger value is red, smaller greener), b (larger value is yellow, smaller blue is )) To measure the color.

  An example of the color chromaticity meter 5 is CR-200 manufactured by Konica Minolta Sensing Co., Ltd. When the analysis region of the chromaticity meter 5, that is, the region where the color measurement can be performed is larger than the width of the white insulating layer 3, the measurement result of the chromaticity meter 5 includes the insulating layer 3. The influence of the groundwork will appear. For example, when the analysis area of the chromaticity meter 5 is φ8 mm, the width of the insulating layer 3 of the electric wire sample 1 is 3.2 mm, 3.6 mm, and 4.6 mm, so that the adjacent electric wires (R, B) Is set so that it is not included in the analysis area, and color measurement must be performed. In addition, it is necessary to consider the color of the jig 9 for setting the wire sample 1. Further, when measuring the color, light from the outside of the fluorescent lamp or the like (hereinafter referred to as “external light”) is generated from the gap between the measurement tool 6 and the wire sample 1 or the gap between the wire sample 1 and the jig 9. There is also a risk of being taken in. For this reason, when measuring color, it is necessary to control the external light.

In the present invention, the color of the white insulating layer 3 is accurately measured in consideration of the above contents, and the degree of deterioration of the electric wire is diagnosed from the measurement result.
Hereinafter, the deterioration diagnosis apparatus according to the present invention will be described in detail.

FIG. 4 is a diagram showing the configuration of the deterioration diagnosis apparatus according to Embodiment 1 of the present invention.
The main part of the deterioration diagnosis apparatus is composed of the above-described chromaticity meter 5, box 10, light source 11, and fixing device 12.

  The box 10 is for adjusting external light. The box 10 has a predetermined sealing degree for blocking light from indoor fluorescent lamps and the like. Further, the box 10 has an opening (for example, a through hole) through which the electric wire sample 1 is passed. The applicant joined aluminum 1 mm in thickness (conforming to JIS 1050: purchased from Niraco Co., Ltd.) with an adhesive to produce a box 10 having an inner dimension of L150 mm × W100 mm × H50 mm. In addition, the inner wall of the box 10 was uniformly coated with black spray (acrylic spray black, 300 ml, HS manufactured by Tokyu Hands Co., Ltd.).

  The light source 11 is provided to measure the color of the white insulating layer 3 and to make the outside light constant so that the outside light does not change depending on the measurement environment. The light source 11 is provided inside the box 10 and is arranged so that the internal space can be illuminated from a predetermined position with a predetermined light amount. Specifically, jujube sphere 20W white (T201720W manufactured by Yazawa Corporation) was used as the light source 11.

  The fixing device 12 is for fixing the measurement tool 6 of the chromaticity meter 5 and the electric wire sample 1 arranged inside the box 10 through the opening in an appropriate positional relationship inside the box 10. Is. The electric wire sample 1 and the measurement tool 6 are appropriately fixed by the fixing device 12, whereby the white insulating layer 3 of the electric wire sample 1 is appropriately arranged with respect to the measurement region of the measurement tool 6. For example, the fixing device 12 fixes the sheath 4 (and the white insulating layer 3) of the wire sample 1 by the fixing portion 12a. In addition, the fixing device 12 fixes the distal end portion of the measurement tool 6 with the fixing portion 12b, and the measurement tool 6 is set so that the measurement direction of the measurement tool 6 is orthogonal to the white insulating layer 3 of the wire sample 1. Hold.

In the deterioration diagnosis apparatus having the above-described configuration, the specification of the light source 11 and the color chromaticity meter 5 (measurement tool 6) are used so that the deterioration degree of the wire sample 1 can be determined based on the color of the white insulating layer 3. ), The positional relationship and the color of the box 10, the light source 11, and the fixing device 12 (wire sample 1 fixed to) are set. Specifically, when an unused electric wire is fixed to the fixing device 12 and the color of the white insulating layer of the unused electric wire is measured by the chromaticity meter 5 in a state where the light source 11 emits light, Adjustment is performed so that the value is 0.5 or more and 3.0 or less. In addition, when determining the deterioration degree of the electric wire sample 1, the light source with which the chromaticity meter 5 is equipped is also used. And it becomes possible to achieve the said objective of this invention by using the deterioration diagnostic apparatus in which such adjustment was performed. That is, it is possible to easily and accurately diagnose the deterioration degree of the electric wire without constructing a huge database or the like.
Hereinafter, an experiment conducted by the applicant to prove the effectiveness of the deterioration diagnosis apparatus will be described in detail.

  At this time, the applicant of the electric wire sample 1 having the above-described configuration is such that the length of the sheath 4 is 200 mm, the exposed length of the white (W) insulating layer 3 is 30 mm, and the exposed length of the conductor 2 is 10 mm. The coating was removed to produce a test piece. In addition, for the deterioration diagnosis device having the above-described configuration, adjustment is performed in advance so that the value of b is 0.5 or more and 3.0 or less when the color of the white insulating layer of the unused electric wire is measured. The following measurements were performed using

The applicant adopted the insulation resistance value of the wire sample 1 as an index indicating the degree of deterioration of the wire sample 1. FIG. 5 is a diagram for explaining a method of measuring the insulation resistance of the wire sample.
In the measurement of the degree of deterioration of the wire sample 1 (test piece), first, the red (R) wire protruding to one end of the wire sample 1 and the white (W) wire on the other end are insulated. The resistance meter 13 is connected and the insulation resistance value is measured. Next, the insulation resistance meter 13 is connected to the black (B) color wire protruding to one end of the wire sample 1 and the white (W) color wire on the other end side, and the insulation resistance value is measured. The smaller value of the measured value was adopted as the insulation resistance value of the wire sample 1.

  This is an index adopted because the insulation performance is lowered and the insulation resistance value is lowered when the insulating layer 3 or the sheath 4 is altered by heat, ultraviolet rays, humidity, oxidation, or the like. This insulation resistance value can be measured, for example, by using a 4339A manufactured by Hewlett-Packard Company, sandwiching the conductor 2 with a predetermined probe, and applying a voltage. In the experiment conducted by the applicant, the voltage was set to 500 V, the measurement time was set to the long mode, and the insulation resistance value R1 after 30 seconds from the start of measurement was recorded.

In this experiment, first, five test pieces were produced for each conductor 2 diameter (φ = 1.6 mm, 2.0 mm, 2.6 mm) for a wire sample 1 of a certain manufacturer (one company). And about each test piece, the color of the insulating layer 3 of white (W) color was measured using the said deterioration diagnostic apparatus, and only b value was recorded. That is, the test piece was appropriately fixed to the fixing device 12, and the color of the white insulating layer 3 of the fixed test piece was measured by the chromaticity meter 5 with the light source 11 being emitted. Moreover, about each test piece, the insulation resistance value was measured by the said method.
Tables 1 to 3 below show the results.

As shown in Tables 1 to 3, when the color of the white (W) insulating layer 3 was measured using the deterioration diagnosis apparatus for the wires of the same manufacturer, the b value variation was very small. Its value ranged from 2.2 to 2.6. Further, the insulation resistance is kept at 10 ¹² Ω or more.

  Next, electric wire samples 1 (the diameter of the conductor 2 of 1.6 mm) from four other manufacturers were obtained, and five test pieces were manufactured for each manufacturer. In the same manner as described above, for each test piece, the color of the white (W) color insulating layer 3 was measured, the b value was recorded, and the insulation resistance value was measured. Tables 4 to 7 show the results.

  As shown in Tables 4 to 7, even if the manufacturers are different, there is not much difference between the b value and the insulation resistance value of the white (W) color insulating layer 3. That is, with respect to the electric wires of various manufacturers, if the electric wires are unused (a state regarded as unused), the b value of the white (W) insulating layer 3 is set to 0.5 or more and 3.0 or less. Can be in range. This is presumed to be because white paint has fewer options than other colors and there is almost no difference between manufacturers.

Next, the test pieces (sample numbers 1 to 35) were left in a high temperature bath at 100 ° C. for 1000 hours, and then the same measurement as described above was performed. Further, after the same test piece was left in the high temperature bath for 4000 hours (total 5000 hours), the same measurement was performed. Table 8 summarizes the results. The unit of insulation resistance in Table 8 is (× 10 ¹² Ω).

  As shown in Table 8, the values of b were all 5 or more and 9 or less after being left at a high temperature of 100 ° C. for 1000 hours regardless of the initial value, and all were 10 or more after being left for 5000 hours. On the other hand, although the insulation resistance slightly began to decrease after 1000 hours for some test pieces, it decreased significantly for all test pieces after 5000 hours.

  From the above results, adjust the positional relationship and specifications of the chromaticity meter 5, the box 10, the light source 11, and the fixing device 12 so that the initial b value is 0.5 or more and 3.0 or less. Thus, it is possible to accurately diagnose the degree of deterioration of the electric wire. That is, when performing the deterioration diagnosis of the electric wire using the deterioration diagnosis device adjusted as described above, first, the electric wire to be diagnosed is appropriately fixed to the fixing device 12, and the color of the white insulating layer 3 of the electric wire is fixed. Is measured by the chromaticity meter 5 in a state where the light source 11 emits light. Then, when the measured b value is 5 or more, it may be determined that the electric wire has deteriorated.

  This is a determination method that utilizes the fact that the cause of the decrease in insulation resistance is the occurrence of defects due to plasticizer evaporation in the insulation layer, and the occurrence of white defects at the same time that this occurs. That is, since the b value increases due to white yellowing, it is used to determine the degree of deterioration of the electric wire.

  The light source 11 is changed to a fluorescent lamp, a cold cathode lamp, a halogen lamp, an LED, an organic EL, an inorganic EL, an HID lamp, an incandescent lamp, and the like, and further, the size of the box 10 is set so that these light sources 11 are accommodated inside. When the evaluation shown in Table 8 was carried out by adjusting the thickness, the same result as above could be obtained.

  In the present embodiment, the three-core VVF electric wire sample 1 in which three electric wires whose colors of the insulating layer 3 are red (R), white (W), and black (B) are combined into one is concretely described. Explained. However, as long as a white layer is used as the insulating layer 3, it is possible to determine the degree of deterioration using the above-described deterioration diagnosis device for any electric wire or cable. Also in this case, when a test piece other than VVF was adopted and the evaluation shown in Table 8 was performed, the same result as above could be obtained.

  Further, when the measurement tool 6 was applied to the inner wall of the box 10 and the fixing device 12 in which the above experiment was performed, and the color was measured with the color chromaticity meter 5 using the light source 11, L = 25. 4, a = 0.0, b = −0.7. As a comparison, when the color of the aluminum plate (without coating) constituting the box 10 was measured in the same manner, L = 63, a = 0.1, and b = 1.5.

  When a product having the same shape as the box 10 was manufactured and the same evaluation as in Table 8 was performed without coating the inner wall, a case where the b value was abnormally small occurred. In such a case, the original numerical value can be obtained by measuring several times while adjusting each position of the chromaticity meter 5 (measurement tool 6), the light source 11, and the fixing device 12 (wire sample 1 fixed to the chromaticity meter 5). I was able to.

  Therefore, various coatings were performed on the inner wall of the box 10 and the same evaluation as in Table 8 was performed. When the b value was negative, the same result as in Table 8 could be obtained by one measurement. . On the other hand, when the b value was positive, a phenomenon that the b value became abnormally small occurred as described above, and remeasurement was necessary.

  Regardless of the color of the inner wall of the box 10 and the fixing device 12, it is possible to achieve the object of the present invention. However, in consideration of the above phenomenon, it is possible to perform a highly reliable deterioration diagnosis with a small measurement error by adjusting each color so that the value of b is negative in advance.

Embodiment 2. FIG.
FIG. 6 is a diagram showing the configuration of the deterioration diagnosis apparatus according to Embodiment 2 of the present invention.
In addition to the configuration in the first embodiment, the deterioration diagnosis device in the present embodiment includes a determination device 14. The determination device 14 is connected to the power source / display device 7 of the chromaticity color meter 5 by a connection cable 15. The determination device 14 has a function of determining the deterioration of the electric wire when the b value of the color measured by the color chromaticity meter 5 is 5.0 or more.

  With the deterioration diagnosis device having the above-described configuration, it is possible to prevent the display content of the power source / display device 7 from being read incorrectly and determining that the deteriorated electric wire is normal. Thereby, the reliability of deterioration diagnosis can be further improved.

DESCRIPTION OF SYMBOLS 1 Electric wire sample 2 Conductor 3 Insulation layer 4 Sheath 5 Colorimeter 6 Measurement tool 7 Power supply / display device 8, 15 Connection cable 9 Jig 10 Box 11 Light source 12 Fixing device 12a, 12b Fixing part 13 Insulation resistance meter 14 Judgment device

Claims (2)

A color measuring device for measuring colors in a Lab display system;
A box having an opening for passing an electric wire;
A light source provided inside the box;
A fixing device for fixing an electric wire arranged inside the box through the opening;
With
When the color of the white insulating layer of the unused electric wire fixed to the fixing device is measured by the color measuring device in a state where the light source emits light, the value of b is 0.5 or more and 3.0 or less. It is adjusted so that,
A deterioration diagnosis apparatus in which the inner wall is adjusted so that the value of b is smaller than 0 when the color of the inner wall of the box is measured by the color measuring device with the light source emitting light . A determination device for determining the deterioration of the electric wire when the value of b of the color measured by the color measurement device is 5.0 or more;
The deterioration diagnosis apparatus according to claim 1, further comprising:

Images