JPS6144415Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil-filled electrical device in which the mounting portion of an oil cooler is improved.

In oil-filled electrical equipment, such as a transformer, especially for reduced insulation, the high-voltage side outlet lead of the high-voltage winding is pulled out horizontally from the center of the high-voltage winding,
It is led out through a high-pressure bushing pocket that is opened in the side wall of the tank. This is because if the high voltage side of the high voltage winding is placed at the end of the winding, a large distance is required between the high voltage side end and the iron core for insulation reasons, and conversely, as mentioned above, the high voltage side is placed at the center of the winding. When placed, the neutral point side with low potential faces the iron core, so
This is because the insulation distance between the end of the winding and the iron core is not required.

A conventional structure for attaching an oil cooler to an oil-filled electrical device having such a configuration is shown in FIGS. 1 and 2. 1 is a tank, and inside this tank 1 there is an iron core of 2A,
Winding wire 2B is stored. The winding 2B consists of a high voltage winding and a low voltage winding, and a high voltage lead 3 is drawn out horizontally from the center of the high voltage winding. This high voltage lead 3 is connected through a bushing pocket 4 communicating with the tank 1 to a high voltage bushing 5 located at the upper part of the bushing pocket 4.

The high-voltage bushing 5 is very large and heavy due to its high voltage, so the bushing pocket 4 that supports it is supported by a support member 6 from the tank 1 in consideration of earthquake resistance, and each high-voltage bushing 5 is
The space between them is also connected by a support member 7. The oil cooler 8 is arranged outside the bushing pocket 4, and its upper part is connected to the cover 9 of the tank 1 by an upper oil pipe 10, and its lower part is connected to the lower part of the tank 1 by a lower oil pipe 11. has been done. From the upper part of the tank 1 and the upper oil pipe 10, a gas vent pipe 12 is connected to the gas detection relay 1 provided at the upper part of the tank.
Piped up to 3.

In addition, 14 is a low voltage bushing, and 15 is a low voltage bus bar box. Since the low-pressure bus box 15 is located on the low-pressure bushing 14 side of the tank 1,
Oil cooler 8 is not provided. In such a conventional structure, as shown in FIG. 1, a long upper oil pipe 10 extending from above the cover 9 is used to connect the tank 1.
and the oil cooler 8, it takes a lot of time to assemble and manufacture the piping. Furthermore, since the upper oil piping 10 is installed from above the cover 9, the gas generated in the tank 1 will accumulate in the upper oil piping 10, so in order to prevent this, not only the tank 1 but also each upper oil piping is installed. 10 also requires a complicated structure in which the gas vent piping 12 is connected to the gas detection relay 13, which has the drawback that it takes a lot of time to manufacture and assemble the piping. In addition, a bushing pocket 4 is provided on the side of the tank 1, and the oil cooler 8 and oil pipes 10, 11 must be placed avoiding this bushing pocket 4.
There is also a disadvantage that only a limited number of oil coolers 8 can be installed on the bushing pocket 4 side of the tank 1 due to restrictions on the installation position and space of the oil coolers 8.

This invention was made to eliminate the above-mentioned drawbacks, and by omitting the unnecessarily long upper oil piping to the oil cooler and eliminating the gas vent piping for the upper oil piping, the overall size of the equipment can be reduced. The object of the present invention is to obtain an oil-filled electrical device that can reduce the number of man-hours required for manufacturing and assembling oil piping.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 shows an embodiment of the present invention, and the same parts as those of the conventional type are designated by the same reference numerals.

The high voltage lead 3 is pulled out horizontally from the center of the winding 2B, especially the high voltage winding, stored in the tank 1, and the high voltage lead 3 is inserted into the bushing pocket 4.
The high pressure bushing 5 is connected through. The upper part of the butting pocket 5 is located at a position that projects from the upper surface of the tank 1. The upper part of the tank 1 and each bushing pocket 4 are connected by an oil guide pipe 16,
The upper part of the oil cooler 8 and the bushing pocket 4 are connected by an upper oil pipe 10. Further, the lower part of the oil cooler 8 is connected to the lower part of the tank 1, that is, the side wall portion without a bushing pocket, using a lower oil pipe 11.

Since the oil-filled electrical equipment of the present invention has such a configuration, the insulating oil heated inside the oil-filled electrical equipment is
The oil flows into the bushing pocket 4 through the oil guide pipe 16 attached to the upper part of the tank 1, and from the bushing pocket 4 through the upper oil pipe 10 to the oil cooler 8. Therefore, the upper part of the oil cooler 8 is the tank 1.
Instead, it has a structure in which it is directly connected to the bushing pocket 4, so there is no need for a long oil pipe from above the cover 9 on the top surface of the tank 1, and there is no need for a gas vent pipe for the upper oil pipe. moreover,
The oil guide pipe 16 can also serve as a support member for the bushing pocket 4.

In addition, if the number of oil coolers 8 is large and it is impossible to attach all the oil coolers 8 to the bushing pocket 4, as shown in the embodiment of FIG.
It is also possible to provide a common oil conduit 17 between each bushing pocket 4 and to connect each oil cooler 8 to this common oil conduit 17 via an upper oil pipe 9. This has the advantage that the common oil conduit 17 can also serve as a support between adjacent bushing pockets 4.

As described above, according to the present invention, the upper oil piping of the oil cooler is shortened, and gas vent piping for the upper oil piping is also unnecessary, so the entire oil-filled electrical equipment becomes compact, and the oil-filled electrical equipment as a whole becomes compact. It is possible to reduce the number of man-hours required for manufacturing and assembling piping. Further, since it is not necessary to route the oil piping avoiding the bushing pocket, there is no restriction on the installation position of the oil cooler, and a large number of coolers can be installed on the bushing pocket side.

[Brief explanation of drawings]

FIG. 1 is a side view showing a conventional structure, and FIG. 2 is a plan view of FIG. 1. Fig. 3 is a side view showing the first embodiment of the present invention, Fig. 4 is a plan view of Fig. 3, and Fig. 5 is a side view showing the first embodiment of the present invention.
The figure is a plan view of the second embodiment. 1...tank, 2A...iron core, 2B...winding,
3... High voltage lead, 4... Bushing pocket, 5... High voltage bushing, 6, 7... Support material,
8...Oil cooler, 9...Cover, 10...Upper oil pipe, 11...Lower oil pipe, 12...Gas venting pipe, 13...Gas detection relay, 14...Low pressure bushing, 15...Low pressure Busbar box, 16...oil guide pipe,
17...Common oil conduit.

Claims (1)

[Scope of utility model registration request] A bushing pocket is attached to the side wall of a tank containing insulating oil together with the iron core and windings, and the upper part of the bushing pocket and the upper part of the tank are communicated by an oil guide pipe, and the upper part of the bushing pocket is connected to the oil cooler. An oil-filled electrical device characterized in that the upper part and the lower part of the tank are connected to the lower part of the oil cooler by oil piping.