JPS5818276Y2 - Transformer path type oil cooling system - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an oil cooling device for an oil-fed transformer.

Conventionally, an oil cooling system for an oil feed type transformer has an oil cooler 2 installed beside the transformer main body 1, as shown in Figures 1A and 0, and an upper oil feed pipe 3 and a lower oil feed pipe 4 between the two. It's communicating.

The oil pump 5 is installed in the middle of the lower oil feed pipe 4 in Fig. 1A and in the middle of the upper oil feed pipe 3 in Fig. 10, and the oil is distributed to the transformer body 1, the upper oil feed pipe 3, and the oil cooler 2 as shown by the arrows. , circulates within the lower oil pipe 4.

However, if the oil pump 5 is attached to the lower oil pipe 4 as shown in Fig. 1A, maintenance of the oil pump 5 will be convenient, but air bubbles generated due to the cavitation phenomenon when the oil pump 5 is started will cause damage to the transformer body 1. There is a risk that it may get inside and threaten the insulation.

Furthermore, as shown in Fig. 10, when the oil feed pump 5 is attached to the upper oil feed pipe 3, the oil flow path from the oil feed pump 5 to the transformer main body 1 becomes longer, so air bubbles disappear in the middle of the oil flow path, and the first Although there is no fear of the insulation capacity being reduced in the case shown in Figure A, maintenance becomes very inconvenient.

In order to avoid a reduction in insulation capacity due to cavitation and to facilitate maintenance, the upper oil feed pipe 3 is lowered midway to near the ground and the oil feed pump 5 is installed as shown in Fig. 2. This requires the oil pipe 3 to be routed for a long time, which is not desirable in terms of design and manufacturing.

Recently, with the increase in the capacity of oil-immersed transformers, highly efficient oil coolers have been required, and the path type shown in Figs. 3A and 0 has appeared to meet this demand.

This oil cooler has a structure in which both headers 7A and 7B are partitioned by partition plates 8, and oil flow paths 9A, 9B and 9C meander in the vertical direction.

The total length of the oil flow paths 9A, 9B, and 9C is three times that of the conventional structure, and the cooling efficiency can be increased accordingly.

In FIG. 3, both headers 7A and 7B are divided into two chambers, and oil flows from top to bottom in the first oil flow path 9A, as shown by the arrow, and in the second oil flow path 9A.
In the third oil flow path 9B, the oil flows from bottom to top, and in the third oil flow path 9C, it flows from top to bottom.

In addition, 10 is a cooling pipe communicating between both headers 7A and 7B, and 1
1 is a blower fan, 12 is an inlet, and 13 is an outlet.

The purpose of the present invention is to provide an oil cooling system for a transformer that partially changes the partition structure of the pass-type oil cooler and arranges an oil pump, thereby avoiding reduction in insulation capacity due to cavitation and facilitating maintenance. It's about doing.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 4A, 0, and 5.

Please refer to FIG.

The oil cooler 6A of the present invention has a lower header 7 that communicates the outlet (lower end) of the downward oil flow path 9A into which oil first flows through the inlet 12 and the inlet (lower end) of the subsequent upward oil flow path 9B.
B is divided by a partition plate 8A, these compartments are communicated by a pipe 14, and an oil pump 5 is attached to this pipe.

As shown in FIG. 5, this oil cooler 6A is communicated with the transformer main body 1 via an upper oil feed pipe 3 and a lower oil feed pipe 4.

In this case, the oil circulates as shown by the arrow.

With the configuration of the present invention, the oil pump 5 is installed downward, making maintenance easy, and the air bubbles generated when the oil pump starts are collected in the upper header part in the middle of the oil flow path from the oil pump to the transformer body. There is no longer any risk of it disappearing in medium or long channels and threatening insulation.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic cross-sectional views showing an oil feed type transformer with a conventional structure equipped with an oil cooler, and Figure 3 is a. Figure 0 is a partially cutaway front view and plan view showing a path type oil cooler.
Figures 4 and 2B are a partially cutaway front view and plan view of a pass-type oil cooler according to an embodiment of the present invention, and Figure 5 is an oil feed type equipped with a pass-type oil cooler according to an embodiment of the present invention. 1 is a schematic diagram showing a transformer. 1...Transformer body, 2...Oil cooler,
3...Upper oil pipe, 4...Lower oil pipe, 5...Oil pump, tank 4...Pass type oil cooler, 7A , 7B... Header, 8, 8
A...Partition plate, 9A, 9B, 9C...
Oil flow path, 10...Cooler, 11...
Blower fan, 12... Inlet, 13... Outlet, 14... Piping.

Claims (1)

[Scope of utility model registration request] A downward oil flow path from an inlet and a subsequent upward oil flow path are separated by a continuous lower header, and adjacent compartments are connected by a pipe, and an oil feed pump is attached to this pipe. A path-type oil cooling system for transformers.