JP2002373813A - Predictive maintenance device for power equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a predictive maintenance device which is simple-structured but can diagnose a trouble or deterioration of a power equipment at all times without opening a container, for the power equipment which stores an electric apparatus such as a capacitor in the container and is filled with an insulation medium. SOLUTION: In a side wall 1 of the container, a pipe 2 which communicates with the inside of the container is provided. An opening of the pipe 2 on the outside is closed by a transparent glass tube 4, and a detection tube 5 for detecting a change in color of a cracked gas included in the insulation medium is disposed in the glass tube 4. Outside the glass tube 4, optical sensors 9a and 9b are disposed which project light on the detection tube 5 and detect light, to monitor a change in color of the detection tube 5 by means of the optical sensors 9a and 9b. Due to this structure, a trouble or deterioration of the equipment for power can be diagnosed at all times by the optical sensors and a visual diagnosis is also available without having influence on the equipment for power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a predictive maintenance device for a power device for predicting and maintaining abnormalities and deterioration of a power device in which an electric device such as a capacitor or a transformer is housed in a container and filled with an insulating medium. It is about.

[0002]

2. Description of the Related Art Generally, in a power device constructed by housing an electric device such as a capacitor, a transformer and a GIS inside a container and filling the container with an insulating medium such as an insulating oil or an insulating gas, an abnormality or deterioration inside the device. Is diagnosed by sampling an insulating medium in a container and analyzing the generated decomposition gas using a gas chromatograph analyzer. In some cases, monitoring is always performed using a gas sensor, or monitoring is performed by removing the internal insulating medium and checking the state with a detection tube during periodic inspection.

[0003]

However, in a diagnostic method of sampling an insulating medium in a container and using a gas chromatograph analyzer to remove the internal material of the power equipment, the amount gradually decreases, and the frequency decreases. In many cases, the diagnosis cannot be performed, and since the container is opened during the operation, there is a risk of deterioration due to oxidation of the insulating medium, the reliability is affected, the operation is complicated, and the cost required for the diagnosis is high.

[0004] In addition, the diagnostic method by performing constant monitoring using a gas sensor requires large-scale equipment and is expensive, and furthermore, the insulating medium is removed and introduced into the detection tube.
The diagnostic method for examining the discoloration has a problem that the reliability may be affected similarly to the diagnostic method using a gas chromatograph analyzer. Above all, there has been a problem that it is almost impossible to diagnose a sealed type capacitor such as a small power capacitor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and has an apparatus for predicting and maintaining power equipment capable of constantly diagnosing abnormality or deterioration of the power equipment without opening the container and with a simple configuration. The purpose is to provide.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a power supply device comprising an electric device housed in a container and filled with an insulating medium, the electric device being provided on the outside of the container with a visual change in color according to the state of the container. A possible detection tube and an optical sensor that emits light to the detection tube and receives light are installed, and a color change of the detection tube is detected by the optical sensor to predict and maintain abnormality and deterioration of the power equipment. It is characterized by becoming.

According to the present invention, a pipe having one end inside the container and the other end opening to the outside of the container is attached to a container containing electric equipment and filled with an insulating medium. A transparent tube having one end sealed with glass or the like is attached and its opening is closed, and a detection tube in which a reagent for detecting a decomposition gas or the like and detecting and discoloring is inserted is fixed inside the transparent tube, and the outside of the transparent tube is fixed. An optical sensor that emits light to the detection tube and receives it is installed.

The detector tube changes color in accordance with the amount of decomposition gas in the insulating medium, and detects the color change by a deviation between the amount of light emitted and received by the optical sensor or the amount of light emitted and received for each of red, green, and blue light. However, this detection makes it possible to always diagnose an abnormality or deterioration inside the power device without opening the container and with a simple configuration. Also, by directly observing the detection tube, it is possible to diagnose abnormality or deterioration of the power equipment.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a configuration of a predictive maintenance device for power equipment according to an embodiment,
Is an explanatory view of a position where the predictive maintenance device is attached to the power device, and FIG. 3 is a cross-sectional view illustrating a configuration of the predictive maintenance device of the power device according to another embodiment.

In FIG. 1, reference numeral 1 denotes a side wall of a container of a small power capacitor containing a capacitor element and filled with a fluorine-based liquid as an insulating medium, 2 is fixed to a side wall 1 of the container by welding or the like, and one end is connected to the container. Inside, a pipe having the other end open to the outside of the container, 3 is provided with a window 3a, and a metal support pipe fixed to the end open to the outside of the pipe 2 by screwing or the like, 4 is an inverted U-shape , A transparent glass tube having a bottom of 5, a detection tube into which a reagent discolored by hydrogen gas is inserted, 6 a holding metal, 7 an O-ring, 8 a detection tube fixing material made of glass wool or a wire mesh, 9 a and 9 b Numeral 9a denotes a light emitting element or a light emitting optical fiber, and 9b denotes a light receiving element or a light receiving optical fiber.

The detection tube 5 is arranged inside the glass tube 4,
At the end of the glass tube 4 on the opening side, a detection tube fixing material 8 is packed and fixed. The glass tube 4 is disposed inside the support pipe 3, and the end on the opening side is inserted into the pipe 2, and is fixed to the opening end of the pipe 2 by a holding metal 6 and an O-ring 7. The opening of the pipe 2 is closed by the O-ring 7 and the bottomed glass tube 4. The light emitting element 9a and the light receiving element 9b are arranged to face the window 3a of the support pipe 3, the light emitting element 9a emits light toward the detecting tube 5, and the light receiving element 9b transmits light toward the detecting tube 5. The light projected at 9a is received.

A window 3a formed in the support pipe 3 is formed large enough to allow the detection tube 5 to be viewed. The light receiving element 9b also receives external light. An intermittent pulse is received, and a light synchronized with the pulse is received to suppress disturbance due to external light.

In the predictive maintenance device including the detection tube 5 and the optical sensors 9a and 9b fixed in the glass tube 4 as described above, the hydrogen gas mixed in the fluorine-based liquid
The gas passes through the inside together with the fluorine-based liquid and is transmitted to the detection tube 5, and the color of the detection tube 5 changes from brown to black, for example. The discoloration is detected by the deviation between the amount of light projected and the amount of light received by the optical sensors 9a and 9b, and the degree of deterioration of the capacitor is determined by this detection.
Predict the remaining life of the capacitor. Although the deterioration of the capacitor can be monitored by the optical sensor at all times, a window 3a is formed in the support pipe 3, and the degree of deterioration can be determined by visually checking the detection tube 5 from the window 3a. it can. In particular, when a fluorine-based liquid is used as the insulating medium, the deterioration due to oxidation is quick, and the effect of detecting the deterioration while the container is closed is great.

Although the above embodiment relates to a capacitor using a capacitor element as an electric device and a fluorinated liquid as an insulating medium, the electric device may be a transformer or the like. may be a gas such as insulating oil or SF6 gas or N ₂ gas as a detection tube acetylene not limited to hydrogen gas, ethylene,
It may be propane. When detecting with a hydrogen detector tube using insulating oil as the insulating medium, if the insulating oil is brought into contact with the detector tube, the color of the detector tube will change within a few days even if there is no internal abnormality, making it impossible to detect decomposition gas However, in this case, a diaphragm is provided to isolate the insulating oil from the detection tube.

A predictive maintenance device comprising a detection tube 5 fixed in a glass tube 4 and optical sensors 9a and 9b is installed on the side wall 1 of the container. This predictive maintenance device is shown by a dotted line in FIG. As described above, the container 12 to which the bushing 10 is attached may be placed 12 on the upper lid surface 11, or may be placed 13 on the upper lid surface 11. When the glass tube 4 is installed on the upper lid surface 11, the insulating medium is filled in advance. Therefore, it is possible to detect the liquid leakage based on the decrease of the insulating medium. Further, the end of the support pipe 3 is open, but may be closed.

FIG. 3 shows a configuration of a predictive maintenance device for electric power equipment according to another embodiment. The parts different from the predictive maintenance device for electric power equipment according to the embodiment shown in FIG. 2 is a fixing structure of a support plate and a support plate (corresponding to the support pipe 3 according to the embodiment shown in FIG. 1). That is, FIG.
In the embodiment shown in FIG. 1, a thick rectangular fixed plate 1 having a through hole 14a formed in the center at the open end of the pipe 2 is provided.
4 is fixed by welding or the like, one end of the transparent glass tube 4 is fitted into the through hole 14a and fixed via the O-ring 7, and a U-shaped support plate 15 having a window (not shown) formed on the outer peripheral surface of the fixing plate 14 is formed. Is fixed to the other end of the support plate 15, and a thick rectangular fixing plate 16 having a concave hole 16a formed in the center is fixed to the other end of the supporting plate 15. Glass is fixed to the concave hole 16a of the fixing plate 16. The other end of the tube 4 is fitted and fixed via an O-ring 7.

A support plate made of a flat plate is fixed on the surface of the U-shaped support plate 15 facing the U-shaped opening surface, and the substantially U-shaped support plate 15 and the flat plate are fixed around the glass tube 4. Covered by a support plate made of In this embodiment, both ends of the glass tube 4 are firmly fixed, and it is possible to cope with an increase in the pressure inside the container. Further, the predictive maintenance device according to this embodiment can also enjoy the same operation and effects as those of the embodiment shown in FIG.

In each of the above embodiments, the tube for accommodating the detection tube is formed of transparent glass, but is not limited to glass. Further, the optical sensor may be of a transmission type or a reflection type, and may be a color sensor or a laser sensor using a laser beam for detecting a projected light amount and a received light amount for each of red light, green light and blue light.

[0019]

As described above, according to the present invention, the diagnosis inside the power equipment can be easily performed by external observation, and the diagnosis can be easily performed without affecting the power equipment. The cost and workability can be greatly improved. In addition, since it has a simple configuration including the detection tube and the optical sensor, it can be installed even in a small sealed device, and it is possible to diagnose abnormalities and deterioration even in a small sealed device. In addition, by performing constant monitoring with the optical sensor, an abnormality in the power device can be found at an early stage.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a predictive maintenance device for a power device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a position where the predictive maintenance device according to the embodiment of the present invention is attached to a power device.

FIG. 3 is a cross-sectional view showing a configuration of a predictive maintenance device for power equipment according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 The side wall of the container which accommodated the electric power equipment 2 Pipe 3 Support pipe 3a Window 4 Transparent glass tube 5 Detecting tube 6 Holder 7 O-ring 8 Detecting tube fixing material 9a Light emitting element of optical sensor 9b Light receiving element of optical sensor 10 Bushing 11 Upper lid surface of container 14 Fixing plate 14a Through hole 15 Support plate 16 Fixing plate 16a Concave hole

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenjiro Mizuta 47-term, Takaune-cho, Umezu, Ukyo-ku, Kyoto N-Shin Electric Co., Ltd. F-term (reference) 2G015 AA02 CA20 2G050 AA07 DA01 EB07

Claims (1)

[Claims] 1. A visible detection tube which changes color according to a state in the container, outside the container of a power device in which an electric device is housed and filled with an insulating medium inside the container. An optical sensor for projecting and receiving light on a tube is installed, and the color change of the detection tube is detected by the optical sensor, and abnormality and deterioration of the power device are predicted and maintained. Predictive maintenance equipment for equipment.