JPH0360164B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a deterioration detection device for transformer oil, and in particular, it relates to a deterioration detection device that is directly connected to a transformer tank and analyzes transformer oil. The present invention relates to a deterioration detection device for transformer oil that has improved installation of piping connected to a transformer tank.

[Conventional technology]

In the conventional transformer oil deterioration detection device, the position of the device container and the manner of connection with the transformer tank are as shown in FIGS. 4 and 5. stored and transformer oil 3
The primary bushing 4a and the secondary bushing 4b are mounted on the tank 1a. The primary side and secondary side bushings 4a, 4b each have live parts 5a, 5b and supporting ground parts 6a, 6b, and at least the live part 5
a, 5b are located so as to be immersed in the transformer oil 3, and are connected to the transformer section 2 by lead wires 7a, 7b.

The deterioration detection device 8 houses a deterioration detection part in a device container 8a, and the transformer tank 1a is provided with piping connections 9a and 9b, and the deterioration detection device container is connected to the deterioration detection device container via stop valves 10a and 10b and piping 11a and 11b. 8a is connected to transformer tank 1a.

Normally, as shown in the figure, the piping connections 9a and 9b are provided at the lower part of the transformer tank 1a, and the transformer oil 3 is taken into the deterioration detection device 8 from the connection portion 9a, and the deterioration detection device 8 receives the transformer oil 3 from the connection portion 9a. Flammable gases are now being analyzed and their amounts can be determined. After the analysis, the oil 3 is returned into the transformer tank 1a through the pipe connection 9b. That is, in this case, the pipe 11a is the outward pipe, and the pipe 11b is the return pipe.

The oil level 3a of the transformer oil 3 fluctuates up and down due to temperature changes, but even when the oil level 3a reaches the lower limit, the live parts 5a and 5b of the bushings are kept in contact with the support grounding parts 6a and 6b of the bushings. Oil level 3a
Avoid exposing the top.

FIG. 5 shows the connection of the oil deterioration detection device in the case of a large transformer, and shows a configuration in which a conservator 12 is provided to absorb large vertical fluctuations in the oil level due to temperature changes. With this configuration, the oil level 3a in the converter 12 communicating with the transformer tank 1a
The conservator 12 is positioned high so that the bushing charging parts 5a and 5b are higher than the bushing charging parts 5a and 5b.
a and 5b are designed so that they are not exposed above the oil surface.

[Problem that the invention seeks to solve]

The conventional oil deterioration detection device is connected to the transformer tank as described above, but although it is not shown in the diagram, it has a complicated mechanism for degassing and analyzing the flammable gas in the oil. Since there are many parts, etc., there is a risk of oil leakage. Therefore, in the event that an oil leak occurs, even if it is detected by monitoring with an oil level gauge, a large amount of oil may leak out before the oil leak can be isolated by operating the valve. can be,
Inside the transformer tank, the bushing's live parts were exposed above the oil surface, causing problems with withstand voltage. There was also the issue of environmental pollution due to the spilled oil.

This invention was made in view of the above-mentioned problems. Even if an oil leak occurs in the oil deterioration detection device, the drop in the oil level due to the oil leakage will prevent the oil level from rising at the piping connection at the top of the transformer. To provide a deterioration detection device for transformer oil in which piping is connected so as to prevent the exposure of live parts.

[Means for solving problems]

The deterioration detection device for transformer oil according to the present invention is characterized in that the piping connecting the deterioration detection device container to the transformer tank is connected to the transformer tank, and the piping connection part that connects the pipe connecting the deterioration detection device container to the transformer tank is connected to vertical fluctuations in the oil level in the transformer tank due to changes in oil temperature. The deterioration detection device container is installed below the lower limit of , and above the charging part position, and the deterioration detection device container forms a closed loop system with the piping, and is equipped with a circulation pump inside. Furthermore, the deterioration detection device may be installed higher than the transformer oil level.

[Effect]

In this invention, the piping connection part of the transformer tank is set lower than the lower limit of the oil level, which normally fluctuates up and down due to changes in oil temperature, so it is possible to extract oil as needed, and it is also possible to charge bushings in the oil. Even if oil leaks from the deterioration detection device, the live part will not be exposed above the oil surface and no problem with withstand voltage will occur. On the other hand, the piping is configured in a closed loop and equipped with a built-in circulation pump, so even if the piping connection is installed at a high position and the hydraulic pressure applied to the deterioration detection device increases, it is enough to compensate for the pressure loss in the piping system. Oil circulation is possible. Furthermore, if the deterioration detection device is provided higher than the transformer oil level, there is less concern about oil leakage, and the oil pressure during oil circulation can be reduced.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

Also in this invention, as shown in FIG. 1, the configuration of the transformer is completely the same as that of the conventional transformer shown in FIG. 4, so the same or corresponding parts are designated by the same reference numerals and the explanation thereof will be omitted. The deterioration detection device 8 is also the fourth one.
Although it is equivalent to the conventional one shown in the figure, in this invention, the piping connection parts 13a and 13b are different from the conventional one, and are lower than the lower limit (when it reaches the lowest level) when the oil level 3a fluctuates up and down due to changes in oil temperature. , are provided at a higher position than the live parts 5a and 5b of the bushing. However, although in FIG. 1 the live parts 5a and 5b of the bushings 4a and 4b are located at the highest position, this is not necessarily the case in all transformers; for example, the bushings 4a and 4b are provided at a position lower than the transformer part 2. In that case, the charging part becomes a transformer and is located higher than the charging path outlet of the transformer. The transformer tank 1a has a pipe connection part 13a,
13b is connected to the deterioration detection device container 8a via stop valves 10a, 10b and piping 14a, 14b, respectively. These piping systems form a closed loop, and as shown in more detail in FIG. 2, there is a deterioration detection section 15 in the deterioration device container 8a, and this piping system is equipped with a circulation pump 16. Piping 14a connection part 17a, circulation pump 16, deterioration detection part 15,
The connecting portion 17b and the piping 14b form part of the closed loop.

With the above configuration, even if the oil temperature changes and the oil level 3a fluctuates up and down, the piping connections 13a,
13b is not exposed on the oil surface 3a, and oil extraction is possible. Furthermore, even if an oil leak occurs in the deterioration detection device, the oil level will not fall below the piping connection parts 13a, 13b, so the oil level 3a will not fall below the live parts 5a, 13b.
5b, the live parts will not be exposed above the oil surface. Generally, the pipe connections 13a and 13b are located at a high position, which increases the height difference of the deterioration detection device 8 and increases the oil pressure.However, the oil pipes 14a and 14b and the oil system of the deterioration detection device 8 are configured in a closed loop. , since the built-in circulation pump 16 is provided, it is only necessary to supply the pressure loss of the piping system, and the piping connections 13a, 13
This can solve the problem of hydraulic pressure caused by installing B at a high location.

FIG. 3 shows another embodiment of the present invention, which differs from the embodiment shown in FIG. 1 only in that the deterioration detection device 8 is provided higher and above the oil level 3a of the transformer 1. This is the same as the implementation order shown in Figure 1. In this embodiment, the influence of oil leakage is even smaller, and the difference in height from the transformer oil level 3a is small, so oil can be circulated to the deterioration detection device more easily. Note that the oil level 3a of the transformer 1 is considered to be the highest location in the case of a transformer having a conservator or in communication with the main body (transformer tank) such as for cooling.

〔Effect of the invention〕

As described above, according to the present invention, the piping connection part for drawing oil from the transformer tank to the deterioration detection device is provided at a higher position than the live part of the transformer, so if the deterioration detection device should be damaged. Moreover, there are no problems with voltage resistance or environmental problems due to oil leakage, and since the deterioration detection device is equipped with a circulation pump in a closed loop configuration, there are no problems with hydraulic pressure caused by the head difference between the piping connection and the deterioration detection device. It is possible to circulate oil without any spots, and it also has the advantage of being able to extract oil.

In addition, when the deterioration detection device is installed at a higher place than the oil level, there is an effect that oil leakage and oil pressure problems are further eliminated.

[Brief explanation of drawings]

FIG. 1 is a simplified sectional view showing the piping connections of one embodiment of the transformer oil deterioration detection device according to the present invention, and FIG.
FIG. 3 is a simplified sectional view showing another arrangement of the deterioration detection device according to another embodiment of the present invention, and FIG. 4 is a conventional transformer. FIG. 5 is a simplified sectional view showing an oil deterioration detection device, and FIG. 5 is a simplified sectional view showing another arrangement example. In the figure, 1 is a transformer, 1a is a transformer tank, 3a is an oil level, 5a, 5b are live parts, 13a,
13b is a pipe connection part, 14a, 14b are pipes, 1
6 is a circulation pump. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A transformer oil deterioration detection device comprising two pipe connection parts that communicate with the inside of a transformer tank, and an outbound pipe and a return pipe that follow these connection parts, wherein the pipe connection part is installed below the lower limit of the fluctuation of the oil level due to changes in oil temperature in the transformer tank and above the position of the live part, and the deterioration detection device container forms a closed loop system with the piping, and a circulation pump is installed inside. A deterioration detection device for transformer oil, characterized by comprising: 2. The transformer oil deterioration detection device according to claim 1, wherein the deterioration detection device container is installed above the upper limit position of the oil level in the transformer tank.