JP2906545B2 - Manufacturing method of light detection probe for hot wire insulation diagnostic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is for a live-line insulation diagnostic apparatus that continuously monitors the degree of insulation deterioration without stopping the operation of working equipment and determines the degree of insulation deterioration of electrical equipment. The present invention relates to a method for manufacturing a light detection probe.

[Prior Art] The measuring part of the conventional hot-line insulation diagnostic apparatus includes an insulated conductor, a protective insulating layer wound around the outer periphery of a plurality of conductors, and a main insulating material filled in the protective insulating layer. And a light detection probe. The light detection probe has an end of the optical fiber for illumination provided inside or outside the main insulating material and an end of the optical fiber for receiving light, and an object to be measured made of an insulating material of the same material as the main insulating material is provided in a gap therebetween. It is formed by filling. Connect the light source to the optical fiber for illumination of the light detection probe, connect the photoelectric conversion element to the optical fiber for light reception,
The transmitted light from the DUT corresponding to the wavelength of the standard light is received. The output of this photoelectric conversion element is input to a colorimetric system, and the relationship between the previously obtained color change and the degree of deterioration of the device under test is stored in the function generator, and the output from the function generator is The degree of deterioration of the object to be measured is determined based on the difference from the output from the colorimetric operation unit of the color measurement system. Such an optical fiber for illumination and light reception includes a core for transmitting light energy, a clad provided on the outer periphery of the core to prevent diffusion of light passing through the core, and a heat-resistant fluororesin coating material on the outer periphery of the clad. Is provided.

[Problems to be Solved by the Invention] However, in the method of manufacturing a conventional light detection probe, a gap formed between the end face of the optical fiber for illumination and the end face of the optical fiber for light reception is covered with the same insulating material as the insulating material. When filling the measurement object, the resin was simply poured and formed.Therefore, there was a layer of air between the individual optical fibers, and the object to be measured oxidized and deteriorated, preventing accurate data from being obtained. was there. In addition, since the coating material made of fluororesin has low adhesive strength, the adhesion between the coating material and the insulating material and between the coating material and the cladding of the optical fiber peels off, and air enters the measured object, causing the measured object to degrade by oxidation. There was a drawback to do it.

Therefore, the present invention solves these problems, eliminates the oxidation deterioration of the measured object by preventing air from entering the measured object like a light detection probe from between the covering material and the insulating material and between the covering material and the optical fiber, It allows accurate measurement.

[Means for Solving the Problems] In order to solve the above problems, a light detection probe for a live wire insulation diagnostic device of the present invention comprises a bundle of a plurality of optical fibers each having a core whose outer periphery is covered with a clad. A first step of preparing an optical fiber bundle by covering the outer periphery with an imide-based coating material, immersing one end of the optical fiber bundle in a low-viscosity epoxy resin, and evacuating the other end of the optical fiber bundle to convert the epoxy resin into the optical fiber bundle; A second step of impregnating the inside and removing the air layer, a third step of heating and curing the impregnated epoxy resin, and providing a hard ring outside the end of the optical fiber bundle on the side having the cured epoxy resin to allow room temperature A fourth step of bonding with a hardening type adhesive, a fifth step of polishing the end face of the optical fiber bundle to which the hard ring is bonded, and melting the room temperature cured adhesive in a high-temperature atmosphere, A sixth step of removing the hard ring and a seventh step of filling the insulating resin into the gap by facing the polished end faces of the two optical fiber bundles from which the hard ring has been removed with a gap provided therebetween. ing.

[Operation] Therefore, since there is no air layer between the optical fibers, the object to be measured does not deteriorate by oxidation. In addition, since the adhesion between the imide-based coating material and the cladding of the optical fiber or the insulating material is strong, air enters the measured object of the insulating material filled in the opposing gap between the end of the optical fiber for illumination and the end of the optical fiber for receiving light. Therefore, the object to be measured does not deteriorate by oxidation.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic diagram for explaining the outline of a live-line insulation diagnostic apparatus of the present invention, and FIG. 2 is a sectional view taken along the line II of FIG. In the figure, reference numeral 1 denotes an insulated conductor, which is provided with a winding in which the conductor is wound in several rows in two rows, a photodetection probe 4 is attached in parallel with the conductor, and an epoxy is provided in the protective insulating layer 2. The main insulating material 3 is formed by impregnating an insulating resin such as a resin. As shown in FIG. 3, the light detection probe 4 bundles a plurality of optical fibers of a core whose outer periphery is covered with a clad (first step), and forms an illumination optical fiber 5 having a coating material 5A, 6A of a polyimide resin on the outer periphery. And the light receiving optical fiber 6. The end of the illumination optical fiber 5 and the end of the light receiving optical fiber 6 are opposed to each other, and a gap between the ends is filled with an object to be measured having the same insulating material as the main insulating material. Is formed integrally with the same insulating material as the main insulating material so as to surround the outer periphery and the object to be measured. As shown in FIG. 4, one end of the optical fiber 5 for illumination and the fiber 6 for light reception were immersed in a container 14 containing an insulating resin 13 such as a low-viscosity epoxy resin, and the other end was connected to a vacuum pump 15. When the optical fiber is connected to the vacuum hose 16 and the inside of the optical fiber is evacuated by the vacuum pump 15, the insulating resin penetrates into the optical fiber (second step). The optical fiber is taken out of the container 14 and the insulating resin is cured in a high-temperature bath (third step) to prevent air from entering the optical fiber. Also, as shown in FIG. 5, the illumination optical fiber 5 and the light receiving optical fiber 6 are bonded with a hard ring 17 of metal or the like by an ordinary temperature hardening type adhesive 18 around the outer periphery of the insulating resin impregnated end (see FIG. Step), the end of the optical fiber is polished integrally with the hard ring by a polishing machine 19 (fifth step). After polishing, the adhesive is melted in a high-temperature atmosphere and the hard ring is removed (sixth step) to prevent irregular reflection of light at the end of the optical fiber. Finally, the end of the optical fiber 5 for illumination and the end of the optical fiber 6 for light reception are made to face each other, and the gap therebetween is filled with an object to be measured which is the same insulating material as the main insulating material (seventh step). Reference numeral 7 denotes a light source connected to the optical fiber for illumination, 8 denotes a photoelectric conversion element connected to the optical fiber for receiving light, 9 denotes a colorimetric operation unit for calculating a color value of the DUT from a signal of the photoelectric conversion element, and 10 denotes a DUT. The function generator 11 previously obtained and stored the relationship between the color value of the same material as that of the insulating resin and the degree of insulation deterioration, and 11 is a signal from the color calculator 9 and a signal from the function generator 10 for measuring the DUT. A deterioration degree calculation unit that calculates the degree of deterioration is configured to output to the display unit 12.

In the hot-wire insulation diagnostic apparatus configured as described above, when the temperature of the winding rises due to the operation of the equipment, the main insulating material 3 is thermally degraded and discolored, and the object to be measured in the light detection probe also discolors. In this discolored state, light transmitted from the light source 7 via the illumination optical fiber 5 passes through the object to be measured in the light detection probe and is received by the photoelectric conversion element 8 via the light receiving optical fiber 6. The colorimetric value is calculated from the signal of the photoelectric conversion element 8 and output to the deterioration degree calculating unit 11. Deterioration degree calculation unit 11, from the color specification signal from the color specification calculation unit, from the color specification signal stored in advance in the function generation unit 10,
The degree of deterioration of the measured object is detected. In this case, since the outer circumferences of the illumination optical fiber 5 and the light receiving optical fiber 6 are covered with a polyimide resin coating material, there is no heat damage. In this example, a polyimide resin was used as the coating material.
The invention is not limited to this, and an imide-based resin such as polyamide imide may be used.The light detection probe is provided in parallel with the conductor of the winding, but is not limited thereto. It may be embedded in the main insulating material between them. The light detection probe is formed of the same insulating material as the main insulating material, but may be formed of a material whose color value changes in correlation with the main insulating material. The hard ring may be made of the same insulating material as the insulating material of the object to be measured, and may be embedded integrally in the light detection probe.

[Effects of the Invention] As described above, the optical detection probe for a live-line insulation diagnostic device of the present invention bundles a plurality of optical fibers into one, covers the outer circumference with an imide-based coating material, and lowers the optical fiber from one end of the optical fiber bundle. Since the epoxy resin having the viscosity is evacuated and impregnated in the optical fiber bundle, the air layer in the optical fiber bundle is removed, and accurate detection can be performed without oxidative deterioration of the measured object. In addition, since the imide-based coating material has a strong adhesive force to the cladding of the optical fiber or the insulating material, there is no air entering the measurement object in the detection probe, and accurate detection without oxidation deterioration of the measurement object occurs. Can be.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a schematic diagram showing an outline of a live-line insulation diagnostic device, and FIG. 2 is a diagram II in FIG.
FIG. 3 is a perspective view of the light detection probe, and FIGS. 4 and 5 are explanatory views for explaining a method of manufacturing the light detection probe. 1: Conductor, 2: Protective insulating layer, 3: Main insulating material 4: Light detection probe, 5: Optical fiber for illumination, 5A: Coating material 6: Optical fiber for receiving light, 6A: Coating material, 7: Light source 8: Photoelectric conversion element , 9: Color calculation unit, 10: Function generation unit 11: Deterioration degree calculation unit, 12: Display unit, 13: Insulating resin 14: Container, 15 vacuum pump, 16: Vacuum tube 17: Hard ring, 18: Adhesive , 19: Polishing machine

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) G01N 21/00-21/01 G01N 21/17-21/61 G01N 21/84-21/90 G01R 31 / 00-31/12

Claims (1)

(57) [Claims] A first step of bundling a plurality of optical fibers each having an outer periphery of a core covered with a clad and forming an optical fiber bundle by covering the outer periphery with an imide-based coating material; Immerse in low viscosity epoxy resin,
A second step of evacuating the other end and impregnating the optical fiber bundle with the epoxy resin to remove the air layer, a third step of heat-curing the impregnated epoxy resin, and a side having the cured epoxy resin. A fourth step of externally attaching a hard ring to the end of the optical fiber bundle and bonding with a cold-setting adhesive; a fifth step of polishing the end face of the optical fiber bundle to which the hard ring is bonded; A sixth step of melting the adhesive in a high-temperature atmosphere to remove the hard ring; and providing a gap between the polished end faces of the two optical fiber bundles from which the hard ring has been removed, and placing an insulating resin in the gap. 7. A method of manufacturing a light detection probe for a hot-wire insulation diagnostic device, comprising: a filling step.