JP2002365178A - Oil gathering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent contamination of entrained air in an insulating oil, when gathering the insulating oil. SOLUTION: A check valve type drain oil port 14 comprising a check valve 17 for the drain oil and a presser flange 18 is formed on a lower part of an apparatus vessel 13 of an oil-filled electrical apparatus, and a check valve type oil-gathering port 26 comprising an insertion part 29 and an oil-gathering check valve 28 is formed on an oil-gathering vessel 15 for gathering and preserving the insulating oil.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates to an oil sampling device for sampling insulating oil sealed in an equipment container of an oil-filled electric device.

[0002]

2. Description of the Related Art Electrical equipment such as condensers and transformers are generally oil-filled electrical equipment in which insulating oil having predetermined electrical characteristics (electrical insulation characteristics) is sealed in an equipment container. However, if the insulating oil is used for a long time because it is deteriorated by electric discharge or the like, the insulating properties are deteriorated, which eventually leads to dielectric breakdown of the equipment. Since the gas is generated in the insulating oil when the discharge occurs, the insulating oil is collected, for example, at regular intervals, and the gas contained in the collected insulating oil is analyzed to diagnose the deterioration state of the insulating oil. That is being done.

[0003] However, since the above-mentioned electric equipment is installed outdoors and a device for analyzing gas in insulating oil is installed in an indoor analysis room, the insulating oil is collected in an oil collecting container before analysis. It is common practice to carry it to an analysis room.

[0004] Fig. 3 shows a method of the sampling. Oil extraction device 2
Is composed of a pipe 3, a valve 4, and an oil collecting container 5. The device container 1 and the valve 4 communicate with each other via the pipe 3 and are attached to a lower portion of the device container 1.
An oil collecting container 5 is provided below the valve 4. The plug of the valve 4 is opened to collect the insulating oil in the oil collecting container 5. FIG. 4 shows the structure of the oil collecting container.

[0005] In FIG. 4, as described above, the insulating oil delivered from the valve 4 passes through the drainage port 9 provided in the oil collecting container 5 and is made of the side surface 7 and a metal thinner than the side surface 7. It is collected in a drum 6 composed of a body 8. Thereafter, the cap 10 is placed over the drainage port 9 so that the cap 10 is tightly closed while being closed.

However, when the cap 10 is tightened, the air between the drain port 9 and the cap 10 is sealed together with the insulating oil, so that the air is mixed into the insulating oil. Then, when the gas in the insulating oil is analyzed, the result is a combination of the gas to be measured and the air, and the reliability of the analysis is reduced.

Therefore, when collecting the insulating oil, the drainage port 9 is filled with the insulating oil, and the above-mentioned body 8 is slightly depressed by human power so that the air in the drainage port 9 is overflowed while the insulating oil overflows. I try to get rid of. In addition, since the projection 11 is provided on the inner bottom of the cap 10, the cap 10
When the cap is tightened, the cap 10 is tightened while further overflowing the insulating oil due to the volume of the protrusion 11, so that the intrusion of air into the oil collecting container 5 can be further prevented.

[0008]

However, since the position of the valve 4 is above the drain port 9 of the oil collecting container 5,
When the insulating oil is collected, it is collected while entraining the surrounding air. As a result, even if the air is prevented from being mixed in from the drain port 9 as described above, the entrained air will be present in the insulating oil collected in the oil collecting container 5, and the reliability of the analysis will be reduced. Will be.

Further, if impurities are present at the outlet of the valve 4, when the insulating oil is collected, the impurities are also mixed into the oil collecting container 5, so that the reliability of the analysis is further reduced. Become.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an oil collecting device for an oil-filled electric device which can prevent entrained air and impurities from being mixed when collecting insulating oil.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a check valve for draining an oil and a check valve for draining the oil to the equipment container at a lower part of the equipment container of the oil-filled electric equipment. A non-return valve type drain port comprising a holding flange is provided, and the oil collecting container includes an insertion portion having a needle to be inserted into the oil drain check valve and an oil collecting check valve communicating with the insertion portion. This is achieved by providing a check valve type oil inlet.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 and 4 are denoted by the same reference numerals. 3 and FIG. 4 refer to the above description, and redundant description is omitted here.

FIG. 1 is a schematic configuration diagram of an embodiment of an oil collecting apparatus for an oil-filled electric device according to the present invention. The oil sampling device 12 includes a check valve type drain port 1 attached to a lower portion of the equipment container 13.
4 and a check valve type oil inlet 26 for collecting and storing insulating oil
The oil collecting container 15 is provided with the oil collecting container 15.

The check valve type oil discharge port 14 has an oil discharge check valve 17 having a projection 16 having one end surface having a substantially mountain shape, and the oil discharge check valve 17 is fixed to the equipment container 13. The holding flange 18 has a donut shape. A hole 21 is formed at the center of the oil discharge check valve 17 in the thickness direction. Since the material is an elastic member including rubber or the like, the hole 21 is always used due to the elasticity of the elastic member.
Is closed, but is opened by the pushing force when a needle 36 of the oil collecting container 15 described later is inserted.

An opening 22 having an area smaller than the area of the oil discharge check valve 17 is provided at a lower portion of the equipment container 13.

When the check valve type oil discharge port 14 is attached to the equipment container 13, the oil discharge check valve 17 is passed while the projection 16 of the oil discharge check valve 17 passes through the opening 22. Attach so that the opening 22 is sealed. After that, the holding flange 18 is attached to the oil discharge check valve 17,
The check valve type drain port 14 is connected to the equipment container 13 with a bolt (not shown).
Fixed to.

FIG. 2 is a structural view of the oil collecting container 15 described above. One end of a side surface 25 of a drum 24 which is a main body of the oil collecting container 15 is provided with an end for attaching a non-return valve type oil collecting port 26 described later at a position substantially perpendicular to the oil discharge port 9 mounted on the side surface 25. An open port 27 is provided.

The check valve type oil inlet 26 is provided with a check valve 28 for oil collection.
And an insertion portion 29. Check valve for oil extraction 28
Has a substantially chevron-shaped protrusion 33 on one end surface, and a tapered passage 34 is formed inside the oil check valve 28. The oil check valve 28 is an elastic member made of a material such as rubber, similar to the oil discharge check valve 17 described above. Therefore, the passage 34 is normally provided by the elasticity of the elastic member.
Is closed, but as described later, when the insulating oil is collected, the pressure of the insulating oil is applied to the tapered wall of the passage, so that the opening is opened by the pressure. The insertion portion 29 is provided with the needle 3 in which the fine hole 37 is formed.
6 and the bottom 30.

The check valve type oil inlet 26 is connected to the port 27
When the needle 36 of the insertion portion 29 and the protrusion 33 of the check valve 28 for oil collection are set in opposite directions, the bottom 30 and the other end face of the check valve 28 for oil collection are aligned. The hole 37 and the passage 34 of the check valve 28 for oil collection are combined so as to communicate with each other. Then, while allowing the projection 33 to pass through the port portion 27, the opening of the port portion 27 is sealed with the check valve for oil collection 28 and fixed to the port with a bolt (not shown).

When extracting the insulating oil enclosed in the equipment container 13 for analysis, the needle 3 of the insertion portion 29
6 is inserted through the hole 21 of the oil discharge check valve 17. Then, the tip of the needle 36 projects from the projection 16 into the equipment container 13. The insulating oil around the tip of the needle 36 is always under a pressure higher than the atmospheric pressure due to its own weight, but since only the atmospheric pressure is applied in the oil collecting container 15, the pressure difference causes the device container The insulating oil in 13 passes through the fine holes 37 of the needle 36 and is guided to the check valve 28 for oil sampling.

The pressure is applied to the passage 34 by the insulating oil carried by the pressure difference. Since the shape of the passage 34 is tapered, the pressure acts obliquely upward on the inner wall of the passage 34, thereby pushing the passage 34 apart. Then, the insulating oil is guided into the drum 24 of the oil collecting container 15 through the expanded passage 34, and fills the inside of the drum 24.

Here, the position of the check valve type oil inlet 26 is an intermediate position of the oil container 15 and is located at half or less the height of the valve 4 of the conventional example. Therefore, when collecting the insulating oil, the insulating oil sent from the protrusion 33 of the check valve for oil collection 28 falls in the drum 24 from half the height of the drum 24. The halving of the height means that the distance in the air through which the insulating oil passes is reduced. Therefore, the amount of air entrainment can be reduced as compared with the conventional example. Also,
Since the falling distance of the insulating oil is short, the rebound of the insulating oil dropped on the lower portion of the drum 24 is reduced, and accordingly, the amount of air included in the rebound is also reduced. Specifically, the amount of entrained air mixed into the insulating oil can be reduced to half or less as compared with the conventional case.

Further, since the needle 36 is inserted directly into the equipment container 13, impurities present at the edge of the valve 4 unlike in the conventional example do not enter the insulating oil.

The hole 21 of the check valve 17 of the check valve type drain port 14 after the needle 36 is pulled out is made of an elastic member made of the material of the check valve 17 as described above. , The insulating oil in the equipment container 13 does not leak to the outside.

The check valve 28 for oil sampling of the check valve type oil sampling port 26 is pulled out of the needle 36 so that the equipment container 13
Since the pressure of the insulating oil inside is eliminated, the passage 34 is similarly closed by the pressure of the elastic member. Therefore, the oil container 1
5 The insulating oil inside does not leak out.

As described above, compared to the conventional example, the entrainment of air can be largely prevented, and the contamination of impurities can also be prevented. Can be prevented.

[0027]

Since the structure of the embodiment described in detail above is adopted, the position where the insulating oil is collected in the oil collecting container is less than half that of the conventional example, and as a result, when the insulating oil is collected,
Air entrainment is reduced as compared with the conventional example. In addition, since contamination of impurities can be prevented, it is possible to prevent a decrease in the reliability of the analysis when analyzing the insulating oil.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of a check valve type drain port of an oil collecting apparatus according to the present invention.

FIG. 2 is a schematic configuration diagram of one embodiment of an oil collecting container of the oil collecting device according to the present invention.

FIG. 3 is a schematic configuration diagram of a conventional oil collecting method.

FIG. 4 is a schematic configuration diagram of a conventional oil collecting container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 Device container 14 Check valve type drain port 15 Oil sampling container 17 Check valve 18 Holding flange 26 Check valve type oil sampling port 28 Check valve for oil collection 29 Insertion part 36 Needle

Claims (1)

[Claims] 1. An oil sampling apparatus for collecting insulating oil enclosed in an oil-filled electric device, wherein a check valve for draining the oil and a check valve for discharging the oil are provided at a lower portion of a device container of the electric device. A check valve type drain port comprising a holding flange for fixing to the equipment container is provided, and the oil collecting container communicates with the insertion portion having a needle inserted into the oil drain check valve and the insertion portion. An oil sampling device characterized by having a check valve type oil sampling port comprising a check valve for oil sampling.