JPS6157688B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a large capacity split type single-phase autotransformer.

In recent years, as the demand for electricity has increased, power transmission voltages have also increased, and transformers have become increasingly high-voltage and large-capacity.

For this reason, three-phase transformers are manufactured in units of single-phase transformers that are divided into each phase, and the transportation unit is made smaller to deal with transportation restrictions. Three-phase banks are formed on-site using overhead wires, etc., and the capacity is increased. It is well known that they are carrying out the following.

Fig. 1 shows a typical wiring diagram of a single-phase autotransformer, and Fig. 2 shows its internal configuration. 1 and 2, 1 is a series winding, 2 is a shunt winding, 3 is a low voltage winding, 4 is a tap winding, and the iron core leg 5
A tap winding 4, a low voltage winding 3, a shunt winding 2, and a series winding 1 are wound in this order from the inside. Also, U, u, and V are high voltage line terminals, medium voltage line terminals, and neutral point side terminals, respectively, and a and b are low voltage line terminals.

However, in the conventional configuration shown in FIG. 2, it is necessary to further divide the single-phase converter when the upper limit of transport restrictions occurs. Conventionally, when dividing a single-phase converter, it was divided into two identical single-phase converters. Figure 3 shows an example of the configuration, in which two tanks 61 and 62 contain series windings 11 and 12, shunt windings 21 and 22, low voltage windings 31 and 32, tap windings 41 and 42, and an iron core. 51 and 52 are housed and connected in parallel to each other through the submerged oil duct 7. In addition, only the high-voltage line end lead duct is shown in the figure.

However, in this split structure, compared to connecting two separate single-phase transformers externally using overhead wires,
The disadvantage was that the transformer itself was not miniaturized and the advantages of division were not utilized.

The present invention takes the above points into consideration, and provides an autotransformer that has the most compact and lightweight configuration to meet severe transportation restrictions and is capable of expanding transportation restrictions and at the same time reducing the size and weight of the entire device. The purpose is to

An embodiment of the present invention shown in the drawings will be described below.

In FIG. 4, the autotransformer according to the present invention stores an iron core 51, a series winding 11, a shunt winding 21, and a low voltage winding 31 wound around the iron core 51 in one tank 61, The iron core 5 is in the other tank 62.
2, a series winding 12, a shunt winding 22, a low voltage winding 32, and a tap winding 4 wound around the iron core 52. Each series winding 11, 12 and each shunt winding 21, 22 are connected in series through an oil submerged duct connected between both tanks 61, 62, and each low voltage winding 31, 32 is similarly connected within an oil submerged duct. are connected in parallel through. Further, the tap winding 4 and the shunt winding 22 are connected in series within the tank 62 by leads.

Next, the effects of the autotransformer of the present invention configured as described above will be explained. As is well known, the major factors that determine the size of a transformer are the capacity or size of the winding, and the required insulation distance between that winding and other windings or the ground electrode of the core, tank, etc.
Figure 5 is a cross-sectional view of the inside of a conventional autotransformer, where a, b, c, d, and e are respectively between the tap winding 4 and the core leg 5, between the tap winding 4 and the low voltage winding 3, and between the tap winding 4 and the low voltage winding 3. Between the masterpiece winding 3 and the shunt winding 2, between the shunt winding 2 and the series winding 1
is the required insulation dimension between the series winding 1 and the tank wall 6. A, B, C, and D are the thicknesses of the tap, low voltage, shunt, and series windings 4, 3, 2, and 1, respectively.

Then, the required dimension l ₁ between the core leg 5 and the tank wall 6 is a+b+c+d+e+A+B+C+D. This can be done by simply halving the amount of winding required, as in the past.
If it is configured with two units, the thickness of the winding per unit will be half, so the dimension _l2 between the core leg 5 and the tank wall 6 will be a + b + c + d + e + 1/2 (A + B + C + D) as shown in Figure 6. .

On the other hand, in the autotransformer of the present invention shown in FIG. 4, if the series, shunt, and low-voltage winding capacities are divided 1:1, the high-voltage line as shown in FIGS. Dimension between the iron core leg 51 and the tank wall 61 on the side that houses the end series winding 11 (Fig. 7)
l ₃ is b + c + d + e + 1/2 (B + C + D), and the one that houses the neutral terminal side shunt winding 22 (the 8th
The dimension l ₄ between the iron core leg 52 and the tank wall 62 in Figure) is a
+b+c'+d'+e, +A+1/2 (B+C+D).

Here, the capacitance of the series, shunt, and low voltage windings is the fifth
If the numbers are the same as those in the diagram, A, B, C, D
The dimensions are the same as in FIG. Also a, b, c,
d and e are also the same as in FIG. 5 because the voltage applied therebetween is the same.

Next, the dimension c′ between the low voltage winding 32 and the shunt winding 22,
The dimension d' between the shunt winding 22 and the series winding 12 and the dimension e' between the series winding 12 and the tank wall 62 are the same as those of the step insulation where the potential at the neutral point is lower than the potential at the end of the line. , c'<c, d'<d, and e'<e. As an example of the size ratio, a:b:
c:c':d:d':e:e':A:B:C:D=1:
1:2:1.5:3:2.5:4:3:0.6:0.8:2:
Let's consider it as 2. Then, l ₃ :l ₄ =1+2+3+4+1/2 (0.8+2+2):1+1+1.5+2.5+3+0.6+1/2 (0.8+2+2)=12.4:12, and l ₃ >l ₄ .

So when we compare l ₃ and l ₂ , we find that l ₃ :l ₂ =1+2
+3+4+1/2(0.8+2+2):1+1+2+3+4+1/2(0.6+0.8+2+2)=124:13.7 or 1
By nearly 0%, the configuration shown in Figure 7 can reduce the dimension between the core leg and the tantalum wall.

This difference corresponds to 30 to 50 mm, and becomes a decisive value when transportation limitations are severe, making the divided structure of the present invention extremely advantageous in terms of transportation limitations compared to the conventional simple two-division structure.

The present invention is not limited to the above-described embodiments, and may be implemented by making one of the cores housed in each tank one main leg and the other core having a plurality of legs. FIG. 9 shows an example of this case, in which the first iron core 5
1 is wound with a series winding 11, a shunt winding 21, and a low voltage winding 31 and stored in a tank 61.
A series winding 12 and a shunt winding 22 are connected to the main leg 52 of the iron core.
and the low voltage winding 32A, and the tap winding 4 and the low voltage winding 32B are wound around the side leg 53 to form the tank 62.
Each series winding 11, 12 and each shunt winding 2
1 and 22 and tap winding 4 are connected in series, and low voltage windings 31, 32A, and 32B are connected in parallel.

In all of the above embodiments, the tap winding is wound around the core on which the neutral point side shunt winding is wound, and is also wound as the innermost winding. Of course, what can be done by winding a series winding around a wound core can also be done by winding a tap winding outside the series winding.

As described above, according to the present invention, it is possible to obtain an autotransformer that is smaller and lighter in weight and can be used to expand transportation restrictions.

[Brief explanation of the drawing]

Fig. 1 is a wiring diagram of a single-phase autotransformer, Fig. 2 is an internal configuration diagram of an autotransformer, Fig. 3 is a sectional view of a conventional autotransformer, and Fig. 4 is a monowinding according to the present invention. Figures 5 to 8 are internal layout diagrams showing one embodiment of the transformer, and are diagrams for explaining that the autotransformer according to the present invention is compact, and Figure 5 is a diagram showing a general autotransformer. FIG. 6 is a diagram of the contents of a conventional autotransformer, FIGS. 7 and 8 are diagrams of the contents of an autotransformer according to the present invention, and FIG. 9 is a diagram of the contents of a conventional autotransformer. It is a contents layout diagram showing an example. 1, 11, 12...Series winding or part of it, 2,21,22...Shunt winding or part of it, 3, 31, 32, 32A, 32B...
Low voltage winding or part of it, 4, 41, 42
...Tap winding, 5,51,52,53...Iron core leg, 6,61,62...Tank or tank wall,
7... Oil duct, U, u, V, a, b... High pressure, medium pressure, neutral point, low pressure, low voltage terminals.

Claims (1)

[Claims] 1. An iron core and a series winding, a shunt winding, and a low-voltage winding wound around the iron core are stored in one tank, and an iron core and a series winding wound around the iron core are stored in the other tank. A series winding, a shunt winding, and a low-voltage winding are housed therein, and a tap winding is wound around at least one of each of the iron cores, and each of the series windings, each shunt winding, and the tap winding are housed. are connected in series, and each of the low voltage windings is connected in parallel. 2. The autotransformer according to claim 1, wherein each winding is wound around one main leg of a corresponding iron core. 3. The autotransformer according to claim 1, wherein each winding is constructed from a plurality of winding units and wound around a plurality of legs of a corresponding iron core. 4. A patent characterized in that a plurality of legs of one iron core are wound with corresponding windings composed of a plurality of winding units, and a corresponding winding is wound around one main leg of the other iron core. An autotransformer according to claim 1.