JP2000114054A - Transformer monitoring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely detect discharged lights inside a transformer without being affected by an insulating cylinder, and to detect a discharged light generating site. SOLUTION: In this transfer monitoring device, fluorescent fiber sensors 20, 21, 22, and 23 are wound around an iron core 2 and the inside and outside of insulating cylinders 5 and 6, and optically connected through an air tight terminal 11 mounted to a metallic container 3 with an optical fiber 12 outside the metallic container 3, and discharged lights are introduced to a detecting part 13 outside the metallic container 3, and converted into an electric signal by the detecting part 13. Then, the intensity is compared so that a discharged light generating site can be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for manufacturing a coil, an iron core and an insulating cylinder in a sealed metal container.
The present invention relates to sealing of a transformer monitoring device for detecting discharge light generated inside a metal container of a transformer enclosed with gas.

[0002]

2. Description of the Related Art Discharge light generated inside a transformer is caused by deterioration of a solid insulator, adhesion of a metallic foreign matter to a high-voltage electrode or a solid insulator, or a metal part having an insufficient electrical connection. When discharge light is generated, the life of the device is shortened, and a wide range of power failure due to dielectric breakdown is caused. Therefore, it is necessary to quickly disconnect the faulty device from the system and repair it.

FIG. 2 is a sectional view showing an example of a conventional transformer monitoring device. In FIG. 2, when the discharge light 8 is generated, the discharge light 8 repeats irregular reflection on the insulating cylinder 6 and the metal container 3 and passes through the light-transmitting window 9, and reaches the optical sensor 10 and detects it. In a normal state, no light is generated inside the metal container. Therefore, if light is detected, it can be immediately determined that discharge light exists inside.

[0004]

However, even if the optical sensor 10 is arranged outside the metal container 3 as described above, the discharge light generated in the inner winding 1b is blocked by the insulating cylinder 6 and is not used. There is a case where the discharge light does not reach to this point, and in this case, it cannot be detected. Also, even when the discharge light is generated at a position distant from the light-transmitting window 9, the amount of the discharge light may be attenuated due to irregular reflection and may not be detected by the optical sensor 10. For this reason, there is a drawback that only the discharge light in a limited portion such as the outer winding 1a or the lead 7 which is not affected by the insulating cylinder 6 can be detected.

An object of the present invention is to solve such a problem and to provide a transformer monitoring device capable of accurately detecting discharge light inside a transformer without being affected by an insulating cylinder and detecting a discharge light generation site. It is in.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a fluorescent fiber sensor is wound around the inside and outside of an iron core and an insulating tube, and a hermetic terminal is installed in a metal container to provide a fluorescent fiber sensor. And the optical fiber outside the metal container is optically connected, and further, the optical fiber is optically connected to the detection unit outside the metal container, and the photoelectric conversion circuit and the comparison circuit provided in the detection unit convert the electric signal to an electric signal. It is characterized by comparing the strength, receives the discharge light with a fluorescent fiber sensor wound around the inside and outside of the iron core and insulating tube, and communicates with the optical fiber outside the metal container through the hermetic terminal attached to the metal container. Connect, guide the detected discharge light to the detection unit outside the metal container, convert the light from each fluorescent fiber sensor into an electric signal with a photoelectric conversion circuit and a comparison circuit provided in the detection unit, compare the intensity, Release It detects a light generation site.

[0007] When the fluorescent fiber sensor receives the discharge light on its outer surface, it is excited by the light and the fluorescent substance in the fiber emits fluorescence and propagates through the fluorescent fiber sensor. By detecting the fluorescence secondarily, the light receiving sensitivity is significantly improved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. FIG. 1 shows an embodiment of the present invention. The fluorescent fiber sensors 20, 21, 22, and 23 are wound around the inside and outside of the iron core 2 and the insulating cylinders 5, 6, and the airtight terminal 11 is installed in the metal container 3, and the fluorescent fiber sensors 20, 21, 2,
The optical fiber 12 and the optical fiber 12 outside the metal container 3 are optically connected to each other, and the optical fiber 12 is optically connected to the detection unit 13 outside the metal container 3. By converting the electric signal into an electric signal and comparing the intensity of the electric signal with the comparing circuit 31, it is possible to detect the location where the discharge light is generated.

For example, when the discharge light 8 is generated in the outer winding 1a inside the transformer, the discharge light can be detected by the fluorescent fiber sensor 20. In this case, even if the discharge light reaches another fluorescent fiber sensor, the fluorescent fiber sensor 20
Is the strongest, the output of each fluorescent fiber sensor is compared by the comparison circuit 31 inside the detection unit 13, so that it can be detected that the discharge light is generated on the insulating cylinder 6 side of the outer winding 1a.

[0010] When the discharge light 14 is generated, the discharge light can be detected by the fluorescent fiber sensor 21. In this case, even when the discharge light reaches another fluorescent fiber sensor, the detection by the fluorescent fiber sensor 21 is the strongest.
By comparing the output of each fluorescent fiber sensor with the comparison circuit 31 inside the detection unit 13 in the same manner as described above, it can be detected that the discharge light is generated on the insulating cylinder 5 side of the outer winding 1a.

Similarly, when the discharge light 15 is generated, the discharge light can be detected by the fluorescent fiber sensor 22. In this case, even if the discharge light reaches another fluorescent fiber sensor,
Since the detection by the fluorescent fiber sensor 22 is the strongest, the output of each fluorescent fiber sensor is compared by the comparison circuit 31 inside the detection unit 13 in the same manner as described above. Can be detected as having occurred.

Similarly, when the discharge light 16 is generated, the discharge light can be detected by the fluorescent fiber sensor 23. In this case, even if the discharge light reaches another fluorescent fiber sensor,
Since the detection by the fluorescent fiber sensor 23 is the strongest, the output of each fluorescent fiber sensor is compared by the comparison circuit 31 inside the detection unit 13 in the same manner as described above. It can be detected that discharge light has been generated.

Further, when it is desired to detect a finer portion, it is possible to detect a finer portion such as an upper portion and a lower portion of the winding by dividing the fluorescent fiber sensors 20 to 23 into a plurality.

[0014]

As described above, according to the present invention, the discharge light generated inside the metal container of the transformer is wrapped with the fluorescent fiber sensor around the iron core inside the metal container and the inside and outside of the insulating tube. An airtight terminal is installed in the container, the fluorescent fiber and the optical fiber outside the metal container are optically connected, the discharge light detected outside the metal container is led out, and the light from each fluorescent fiber sensor is converted into an electric signal by the detection unit. By comparing the intensities, it is possible to accurately detect the discharge light inside the winding and to detect the discharge light generation site.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an example of a conventional light detection method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Winding 1a Outer winding 1b Inner winding 2 Iron core 3 Metal container 4 Bushing 5, 6 Insulating cylinder 7 Lead 8, 14, 15, 16 Discharge light 9 Light transmissive window 10 Optical sensor 11 Airtight terminal 12 Optical fiber Reference Signs List 13 detection unit 20, 21, 22, 23 fluorescent fiber sensor 30 photoelectric conversion circuit 31 comparison circuit

Claims (1)

[Claims] 1. A transformer monitoring device for detecting discharge light generated inside a metal container of a transformer, wherein at least a winding;
A transformer including an iron core, an insulating tube, a plurality of fluorescent fiber sensors wound around the inside and outside of the iron core and the insulating tube, and a hermetic terminal provided in the metal container; and a photoelectric conversion circuit. The fluorescence fiber sensor and the optical fiber outside the metal container are optically connected via the hermetic terminal, and further the optical fiber and the detection unit are optically connected, A transformer monitoring device that converts a signal output from a fluorescent fiber sensor into an electric signal in a photoelectric conversion circuit of the detection unit and compares the intensity of the electric signal to detect a portion where discharge light is generated.