JPH06223657A - Bushing with abnormality detecting device - Google Patents

Abstract

PURPOSE:To readily detect the abnormal state inside a bushing at the place of installation of the bushing in a short time. CONSTITUTION:In a bushing having insulating oil O sealed in a bushing main body 1, a gas reservoir portion 16 is defined outside the bushing main body 1 via a gas impermeable body 18 to retain gas dissolved in the insulating oil O in the gas reservoir portion 16. A gas detecting body 24 is provided inside the gas reservoir portion 16 and the discoloring reaction of the gas detecting body 24 in the presence of acetylene gas or the like is visually checked from a checking window 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bushing provided at a lead-out portion of a transformer or a switch, and more particularly to a bushing with an abnormality detecting device capable of detecting an abnormality inside.

[0002]

2. Description of the Related Art Generally, in this type of bushing, insulating oil is enclosed in the bushing body to ensure internal insulation and to prevent deterioration of the insulating oil due to ingress of oxygen and moisture in the outside air. Inert gas is injected at a pressure of about 1.0 atm. Then, in the conventional bushing, when detecting an internal abnormality, the insulating oil is sampled from the inside of the bushing body, the gas dissolved in the insulating oil is analyzed by gas chromatography, and the electrical characteristics of the insulating oil are measured. It was.

[0003]

However, the dissolved gas analysis of the insulating oil and the measurement of the electrical characteristics in the conventional bushing cannot be performed immediately at the location where the bushing is installed. Therefore, it is troublesome and troublesome, and
There is a problem that it takes time to produce the results of analysis and measurement.

The present invention has been made by paying attention to the problems existing in such a conventional technique, and the purpose thereof is to easily and easily detect an internal abnormal state at a place where a bushing is installed. An object of the present invention is to provide a bushing with an abnormality detection device that can detect time.

[0005]

In order to achieve the above object, in the invention described in claim 1, a bushing body in which insulating oil is enclosed, and an inert gas is press-fitted into the upper part of the bushing body. In a bushing having a space portion, a gas reservoir portion for taking out and storing a dissolved gas in insulating oil is provided outside the bushing body via a gas permeable body.

Further, in the invention according to claim 2, in the bushing with an abnormality detecting device according to claim 1, a gas detector that causes a color change reaction due to the presence of gas is provided in the gas reservoir, and the outside of the gas reservoir is provided. Is provided with a confirmation window for visually confirming the color change reaction of the gas detector.

Further, in the invention according to claim 3, in the bushing with an abnormality detecting device according to claim 2, an opening for replacing the gas detector is provided outside the gas reservoir, and the opening is formed. The lid is detachably attached to the.

[0008]

In the bushing with an abnormality detecting device according to the first aspect, when an abnormality such as partial discharge occurs inside the bushing body, an acetylene (Cn Hn) type gas is generated and dissolved in the insulating oil. Then, since the inert gas is press-fitted into the upper part of the bushing, the gas dissolved in the insulating oil is stored in the gas storage portion via the gas permeable body. Therefore, for example, by extracting gas from the gas reservoir with a syringe or the like and detecting it with a gas detection tube or the like, it is possible to easily and quickly detect an abnormal state such as partial discharge at a location where the bushing is installed.

Further, in the bushing with an abnormality detecting device according to a second aspect, when gas is accumulated in the gas reservoir due to an abnormality such as partial discharge, the gas detector causes a color change reaction. Therefore, by visually confirming the color change reaction of the gas detector through the confirmation window, it is possible to immediately detect an abnormal state such as partial discharge.

Further, in the bushing with an abnormality detecting device according to the third aspect, the gas reservoir can be opened to the outside by removing the lid from the opening. Therefore, it is possible to easily replace the gas detector that has undergone the color change reaction through this opening.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bushing with an abnormality detecting device embodying the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 2, the bushing body 1 is mounted on a mounting base 2 and is connected to a lower porcelain bushing 3 in the mounting base 2. The bushing main body 1 includes a flange metal fitting 5 fixed on a mounting base 2 by a plurality of bolts 4, an upper porcelain tube 7 connected to the flange metal fitting 5 via a gasket 6, and a gasket on the upper porcelain insulation pipe 7. And an expansion chamber 9 connected to each other via 8.

The conductor 10 is inserted and arranged in the center of the bushing body 1, and a capacitor core 11 is wound around the outer periphery thereof. The lid 12 is detachably attached to the opening of the expansion chamber 9 through a gasket 14 by a plurality of bolts 13, and an insertion hole 15 for inserting the conductor 10 is provided at the center thereof. The insulating oil O is contained in the bushing body 1, and an inert gas G such as nitrogen gas is provided on the upper portion thereof.
It is sealed at a pressure of 0.5 to 1.0 atm.

As shown in FIGS. 1 to 3, the substantially cylindrical gas reservoir portion 16 is a flange fitting 5 of the bushing body 1.
Is formed so as to integrally project outside, and a mounting step portion 17 is provided at the inner end thereof. The gas permeator 18 is the mounting step 1
The gas reservoir 16 is attached to the inside of the bushing body 1.

The gas permeation body 18 is made of a porous substrate 19 such as alumina ceramic and a fluorine-based, polyolefin-based or polyvinyl alcohol-based material bonded to the inner surface of the substrate 19. Molecular film 2
It is composed of 0 and 0. When the Cn Hn-based gas generated in the bushing body 1 due to partial discharge or the like is dissolved in the insulating oil O, the inert gas G is in a pressurized state in the upper portion of the bushing body 1, so that the gas is a gas. It moves through the permeation body 18 and is stored in the gas storage portion 16. In addition, in order to enhance the gas extraction effect,
The inside of the gas reservoir 16 may be evacuated to a low pressure.

The holder 21 is located inside the gas reservoir 16.
The mounting step 17 with a plurality of screws 22
And a pair of elastic holding claws 23 are provided at the tip thereof.
Has been. The gas detector 24 is an elastic holding claw of the holder 21.
A cylindrical reagent container 2 that is detachably attached between 23
5 and the reagent container 25 are separately enclosed in the two accommodating portions.
And two different reagents 26 prepared.
The reagent 26 is, for example, for detecting hydrogen gas.
For detection of potassium palladium sulfite and acetylene gas
Of iodine pentoxide, potassium dichromate for propane detection
Ethylene, (C _nH_2n) Palladium sulfate for gas detection
And ammonium molybdate.

In the hydrogen gas detecting reagent 26, potassium palladium sulfite is reduced by hydrogen gas to deposit metallic palladium, and the color changes from yellow to yellowish brown depending on the hydrogen concentration. In the reagent 26 for detecting acetylene, iodine pentoxide is reduced by acetylene to release iodine, and the color changes from white to green brown. The propane detection reagent 26 is
Potassium dichromate is reduced by propane and the color changes from yellowish brown to black green. Reagent for detecting ethylene 26
The ammonium molybdate reacts with the compound produced by the reaction of ethylene and palladium sulfate to change the color from pale yellow to blue.

A confirmation window 27 is formed on the outer circumference of the gas reservoir 16, and a see-through plate 28 made of transparent glass or the like is attached to the confirmation window 27. Then, through the confirmation window 27, it is possible to visually confirm whether or not the reagent 26 of the gas detector 24 has changed color. The opening 29 is formed at the tip of the gas reservoir 16, and a lid 30 is detachably screwed into the opening 29 via a packing 31. By removing the lid 30, the gas detector 24 that has undergone the color change reaction can be detached and replaced from the gas reservoir 16 through the opening 29.

Now, in the bushing of this embodiment,
When an abnormality such as partial discharge occurs inside the bushing body 1, a Cn Hn-based gas or the like is generated and dissolved in the insulating oil O. Then, the gas dissolved in the insulating oil O is stored in the gas reservoir 16 via the gas permeable body 18.

At this time, since the gas permeation body 18 is composed of the substrate 19 made of a porous material such as alumina-based ceramic and the polymer film 20 bonded to the inner surface of the substrate 19, the insulating oil O The contained impurities do not cause clogging of the porous substrate 19 in a short period of time.

When the gas is stored in the gas reservoir 16 in this way, the reagent 26 of the gas detector 24 undergoes a color change reaction depending on the gas component. Therefore, by visually confirming the discolored state of the gas detector 24 through the confirmation window 27, it is possible to easily and quickly detect an abnormal state such as partial discharge at a location where the bushing is installed.

When the reagent 26 of the gas detector 24 undergoes a color change reaction, the tip of the gas reservoir 16 can be opened to the outside by removing the lid 30 from the opening 29. Therefore, the gas detector 24 that has undergone the color change reaction can be easily replaced with a new one through the opening 29.

The present invention is not limited to the configuration of the above-described embodiment, but may be modified and embodied as follows without departing from the spirit of the present invention. (1) In the invention according to claim 1, the gas reservoir 16
To project on the outer circumference of the expansion chamber 9. (2) In the invention according to claim 1, the gas reservoir 16
The gas reservoir 16 is provided without providing the gas detector 24 therein.
It should be constructed so that the gas accumulated inside can be extracted with a syringe and detected with a gas detector tube. (3) In the invention according to claim 2, three or more storage parts are formed in the reagent container, and three or more different kinds of different reagents 26 are separately enclosed in the storage part.

[0024]

Since the present invention is configured as described above, it has an excellent effect that an internal abnormal state can be detected easily and in a short time at the location where the bushing is installed.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an embodiment of a bushing with an abnormality detecting device embodying the present invention.

FIG. 2 is a partially cutaway front view showing the entire bushing.

FIG. 3 is a partial cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bushing main body, 5 ... Flange metal fittings, 7 ... Upper insulator pipe, 9 ... Expansion chamber, 16 ... Gas storage part, 18 ... Gas permeation body, 19 ... Substrate, 20 ... Polymer film, 24 ... Gas detector,
25 ... Reagent container, 26 ... Reagent, 27 ... Confirmation window, 29 ... Opening part, 30 ... Lid, O ... Insulating oil.

Claims (3)

[Claims] 1. A bushing body containing insulating oil,
In a bushing having a space in which an inert gas is press-fitted in an upper portion inside the bushing main body, a gas reservoir for taking out and retaining a dissolved gas in insulating oil is provided on the outer side of the bushing main body with a gas permeable body. A bushing with an anomaly detection device characterized by being provided through. 2. A gas detector for discoloring due to the presence of gas is provided in the gas reservoir, and a confirmation window for visually confirming the discoloring reaction of the gas detector is provided outside the gas reservoir. The bushing with an abnormality detection device according to claim 1. 3. An opening for replacing the gas detector is provided outside the gas reservoir, and a lid is detachably attached to the opening. Bushing with abnormality detection device.