JPS606527B2 - split single phase transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a split single-phase transformer that can be transported separately in a substantially fully assembled state.

As is well known, conventional 275KV class transformers are of the so-called special three-phase type, in which three single-phase transformers are connected by a common cover and integrated due to transportation size constraints.
For KV or 750KV class transformers, the distance between the phases of the air bushings becomes very large, so it is more economically advantageous to arrange three single-phase transformers in parallel and connect the three phases using air bushings than to use a special three-phase type.

Therefore, for ultra-high voltage transformers of 500KV class or higher, a system in which three single-phase transformers are arranged in parallel is usually adopted. However, in recent years, with the increase in capacity, there are often restrictions on the transportation of single-phase equipment.Also, since high-pressure bushings are attached to tanks, their rigidity must be increased, which makes it necessary to further divide single-phase equipment. In addition, there is a demand for a split-type single-phase transformer that can be easily assembled on-site and that does not absorb moisture during assembly.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a split type single-phase transformer that has a reduced rigidity of the tank, is easy to assemble on-site, and is free from moisture absorption.

The present invention will be explained below with reference to embodiments shown in the drawings.

1 and 2 are a plan view and a plan view of the interior of the split single-phase transformer according to the present invention, respectively, viewed from above. Reference numeral 11 indicates the entire split single-phase transformer, and this transformer 11 has a first single-phase transformer 11A and a second single-phase transformer of the same size, which are arranged in parallel via a separable connecting duct 15. It consists of a transformer 11B. The first single-phase transformer 11A has a flange frame 1 on one side of a tank 13A that houses a single-phase autotransformer body 12A.
5A is fixed and the connecting duct 15 of this flange frame 15A
one end of which is releasably connected. Second single-phase transformer 11
B is a flange frame 15 attached to a tank 13B housing a single-phase autotransformer main body 12B similarly to the first single-phase transformer 11A.
B is fixed, and the pond end of the connection duct 15 is separably connected to this flange frame 158. 17 is a high-voltage bushing provided on the upper surface of the duct 15; 18 is the first single-phase transformer 11;
A medium-pressure bushing is provided on the top of the tank of A, and 19 is a low-pressure bushing that is provided on the top of the tank of the second single-phase transformer 11B.

A high-pressure wall noble conductor 21A and a medium-pressure wall noble conductor 2 are supported by insulating spacers on the left and right sides of the duct of the tank 13A, respectively.
2A is attached, and a low pressure wall noble conductor 23A of the same structure is attached below the medium pressure wall noble conductor 22A. The high-pressure wall noble conductor 21A is connected to the high-pressure outlet of the main body 12A in the tank, the medium-pressure wall noble conductor 22A is connected to the medium-voltage bushing 18 together with the medium-voltage outlet of the main body 12A, and the low-pressure wall noble conductor 23A is connected to the low-pressure outlet of the main body 12A. Each outlet is connected inside the tank. The high pressure, medium pressure, and low pressure wall noble conductors 21A and 22A of the tank 13A are mounted on the duct side side surface of the tank 13B.
, 23A, a high voltage wall noble conductor 21B, an intermediate voltage wall noble conductor 228, and a low voltage wall noble conductor 23B, which are supported by insulating spacers, are installed in contrast to the main body 12B. The high-pressure outlet and the medium-pressure outlet of the main body 12B are connected in the tank, and the low-pressure wall conductor 23B is connected to the low-pressure bushing 19 together with the low-pressure outlet of the main body 12B in the tank.

The single-phase transformers 11A and 11B assembled in this way are connected in the connection duct 15 between the high-pressure wall noble conductors 21A and 21B,
Between medium pressure wall noble conductor 22A and 22B and low pressure wall noble conductor 23
By connecting A and 23B respectively, they are connected in parallel.

At this time, the connecting portions of the high-pressure wall noble conductors 21A and 21B are connected to the high-pressure bushing 17 provided in this duct. During transportation, the upper tanks 13A, 13 are separated from the connection inside the bush-connected duct 15.
By disconnecting the connection between B and duct 15, transformer 11A
, 11B are separated, medium pressure and low pressure bushings 18,
By simply removing 19, transportation becomes possible in a substantially fully assembled state.

In this case, as shown in FIG. 4, a temporary cover 24 is attached to protect the wall noble conductor projecting outward. Although the upper part of the tank is temporarily opened when attaching and detaching the intermediate pressure bushing 18 and the low pressure bushing 19, this is done in a relatively short time, and dry air etc. are blown away, so that no moisture is absorbed. Furthermore, since there is little insulating material inside the connection duct 15, even if it absorbs some moisture, it is almost completely dehumidified by vacuum lubrication during reassembly.
Therefore, it is easy to secure the insulation distance between the high, medium, and low pressure bushings, and since the tanks 13A and 13B are not equipped with high pressure bushings as in the past, the rigidity can be reduced, and only the connecting duct 15 is equipped with high pressure bushings. The structure can be simplified by increasing the rigidity to withstand earthquake resistance of 17. In the embodiment shown in FIGS. 5 to 7, a medium voltage bushing 18 of a single-phase transformer 11A is attached to an adapter 24A provided on the side of a tank 13A, and a medium voltage The wall noble conductor 22A is attached, and the wall noble conductor 22A is connected to the medium pressure bushing 18 in the adapter, and the wall noble conductor 22A is connected to the medium pressure outlet of the main body 12A and introduced into the tank 18A through the connection duct 15. The medium voltage outlets on the transformer 11B side are both connected in the tank, and the low voltage bushing 19 of the single phase transformer 118 is connected to the transformer 1.
The medium pressure bushing 18 of 1A is attached to the adapter 24B provided on the side of the tank 13B on the same machine, and a low pressure wall noble conductor 238 is attached to the tank side that penetrates from inside the tank into the adapter 248, and one end of this wall noble conductor 23B is attached. It is connected to the low pressure bushing 19 in the adapter, and the low pressure outlet of the main body 12B and the connecting duct 15 are connected to the end of the wall noble conductor 23B.
The low-pressure outlet of the transformer 11A introduced into the tank 138 through the connection is connected within the tank.

With this, even if the intermediate pressure pusher 18 and the low pressure bushing 19 are removed together with the Agupta during transportation, the tank 13A
, 13B are sealed by the medium pressure wall noble conductor 22A and the low pressure wall noble conductor 23B, so that it can be transported in a fully assembled state. On-site assembly is thus made easier and more reliable. In each of the above embodiments, the leads of two single-phase transformers are connected in parallel in the connecting duct, but if the single-phase transformers each have a tap winding, the connections can be made as shown in Figure 8. The tap cutter 25 is attached to the duct 15, and the tap leads of the tap windings can be drawn out into the connection duct 15 through the respective wall conductors and connected to the tap cutter 25 in the same manner as the above-mentioned lead connection. .

As described above, according to the present invention, the rigidity of the tank is reduced and the rigidity of only the connecting duct is increased, so that it can be transported in a nearly fully assembled state when transported separately, and there is no risk of moisture absorption, resulting in a highly reliable split single-phase transformer. Equipment can be provided.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the split single-phase transformer according to the present invention, FIG.
The drawings are Fig. 2, a view taken along line 1-1, Fig. 4, an external view during transportation, Fig. 5, an internal plan view showing another embodiment of the present invention, and Fig. 6.
Figures and Figure 7 are top views of parts A and B in Figure 5, and Figure 8.
The figure is a plan view showing still another embodiment of the present invention. 11A, 11B... Single phase transformer, 12A, 12B...
...Body, 13A, 138...Tank,
15... Connection duct, 17... High pressure bushing, 21A, 218, 22A, 22B, 23A, 23
B... Hajime Taka conductor. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1. A first and a second single-phase transformer, each of which has a through-wall conductor supported by an insulating spacer, arranged side by side with one side of a tank containing a transformer body facing each other, and this first , a connection duct separably coupled between sides of a tank of a second single-phase transformer and accommodating the through-wall conductor in oil, wherein the first and second single-phase transformer bodies are connected to the connection duct. 1. A split single-phase transformer, wherein the transformers are connected in parallel through through-wall conductors, and the high-voltage side of the connecting portion is connected to a high-voltage bushing provided in the connecting duct.