JP2000357613A - Transformer with tap switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a transformer with tap switches into a simple tank structure having a short entire length and hence a small domination area by disposing two tap switches symmetrically about the center line of the transformer at a specified angle from the center line. SOLUTION: A transformer 100 with tap switches has a transformer body 1 and two tap switches 4 stored in a transformer body tank 5 having the width W2. The two tap switches 4 are disposed symmetrically about the center line of the transformer body 1 at an angle θ which is smaller than 90 deg.. The angle θis so set that a minimum necessary space for electric insulation and a wiring work may be secured between the transformer body tank 5 and the outline of the tap switches 4. As a result, the transformer 100 with tap switches can be made into a simple tank structure having a short entire length and its domination area can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer with a tap changer of a high voltage and an extra high voltage.

[0002]

2. Description of the Related Art In general, tap changers used in transformers are standardized by current and voltage, and it is desired to use a standard series of tap changers from all viewpoints including cost reduction. . In addition, the tap changer of the standard series may have two tap changers connected in parallel in a circuit due to the limitation of current capacity. In this case, the transformer tank and the tap changer tank are usually connected to each other. It is an integral tank. FIG. 4 is a plan view of a transformer 100 with a tap changer showing a conventional arrangement when two tap changers are used. In FIG. 4, reference numeral 1 denotes a transformer main body, 2 denotes a transformer coil, and a dimension A shown in the figure is usually larger than a dimension B of the tap changer 4. Reference numeral 3 denotes a transformer core, 4 denotes a tap changer, 5 denotes a transformer main body tank serving as a container, and a transformer section tank 5a and a tap changer section tank 5
and b. As shown in FIG.
Two tap changer 4 is disposed perpendicularly to the major axis direction of the transformer main body 1, has a wide W ₁ as compared to the width W of the transformer unit tank 5a. Here, the width dimension W of the transformer section tank 5a is determined based on the dimension A of the transformer coil 2. As described above, in the conventional example shown in FIG.
Since it is arranged a tap changer 4 of the table, the transformer body of the tap changer unit tank 5b, and the both are integrated T-shaped with dimensions W ₁ exceeds the width W of the transformer unit tank 5a It is a tank 5. FIG. 5 shows another conventional arrangement in which two tap changers 4 are connected to the transformer body 1.
Transformer with tap changer 1 arranged in series in the major axis direction
00 is a plan view of FIG. In this conventional example, the tap changer 4
The structure of the tank for housing the transformer unit tank 5 is completely integrated with the transformer unit tank with the same width dimension W, and is shown as a transformer main body tank 5. ,
Having a longer dimension L _1.

[0003]

Since the conventional transformer with a tap changer is configured as described above, there are the following problems. (1) In the case of the arrangement shown in FIG. 4 The tank shape is T-shaped and complicated, and the number of parts increases. In addition, the production cost increases and the production period becomes longer. Further, when the radiator for cooling the transformer is mounted over the entire length in the major axis direction, the structure becomes complicated, the external dimensions become large, and the floor area for installation increases. (2) In the case of the arrangement shown in FIG. 5 Since the transformer section tank and the tap changer section tank have the same width, the tank of the tap changer section has an extra space and is filled in the tank. The amount of insulating oil used increases. In addition, the longer the total length L _1, the dimensions at the time of transport restrictions and, subject to the size limit at the time of loading.

The present invention has been made in order to solve the above problems, and provides a transformer with a tap changer having a simple tank structure with a short overall length, a small occupied floor area, and a reduction in cost. .

[0005]

In a transformer with a tap changer according to the present invention, two tap changers are arranged symmetrically with respect to the center line of the transformer and at an angle of less than 90 °. It is a thing.

Further, a transformer section tank and a tap changer section tank which is separably connected to the transformer section tank and accommodates two tap changers are provided, and the two tap changers are provided for the transformer. They are arranged symmetrically with respect to the center line and at an angle of less than 90 °.

Further, the width of the tap changer tank connected to the transformer tank is smaller than the width of the transformer tank.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an arrangement of a transformer 100 with a tap changer. In the figure, 1 is a transformer main body, 2 is a transformer coil, and 3 is a transformer core, which is the same as the conventional example. Reference numeral 4 denotes a tap changer, but in the first embodiment, a tap changer under load is shown. In the first embodiment, tap changer with the transformer 100, a transformer body tank 5 having a width W ₂
Housed therein a transformer main body 1 and two tap changers 4. The two tap changers 4 are arranged symmetrically with respect to the center line of the transformer main body 1 and at an angle θ of less than 90 °. As shown in the conventional example, since the dimension B of the tap changer 4 is usually smaller than the dimension A of the transformer coil 3, the minimum space required for electrical insulation and connection work is the transformer main tank 5. The angle θ is set so that it can be secured between the tap changer unit tank and the outer periphery of the tap changer 4. That is, the width W ₂ of the transformer main body tank 5 is determined in consideration of the above. This W ₂ is equal to or smaller than the tank width W of the conventional example.
_2> if the W is also but, even then, the total length L ₂ of the tap changer with the transformer 100 is compared with L ₁ of the conventional example,
It has the advantage of being shorter. As described above, since the tap changer 4 is arranged symmetrically with respect to the center line of the transformer main body 1 and has an angle θ of less than 90 °, the transformer 100 with the tap changer, the transformer main body tank overall length L ₂ of 5, can be shortened as compared with the conventional.

Here, for example, when the tap changer 4 capable of adopting an angle θ of 45 ° is arranged, the dimension l ₂ between the tap changers is about ₁ in comparison with l ₁ shown in FIG. 30%
The total length of the transformer 100 with a tap changer and the transformer main tank 5 can be shortened by the corresponding dimension,
Also, the amount of insulating oil can be reduced by about 20%. As described above, the first embodiment is smaller in size, has a smaller amount of insulating oil, is economically advantageous, and has a smaller number of parts and a smaller installation area.
An excellent transformer 100 with a tap changer can be provided.

Embodiment 2 In the first embodiment, the transformer with tap changer 100 has a structure in which the transformer part tank and the tap changer part tank are integrated, but as shown in FIG. It has a simple structure. This will be described below with reference to the drawings. In FIG. 2, the transformer 100 with a tap changer has a transformer section tank 5a and a tap changer section tank 5c which are divided and connected by flanges 5d and 5e provided respectively. The two tap changers 4 according to the second embodiment are arranged symmetrically with respect to the center line of the transformer main body 1 and at an angle θ of less than 90 ° as in the first embodiment. still,
In FIG. 2, the illustration of the center line and the angle θ is omitted. Then, the total length L ₂ is equivalent to that shown in the first embodiment, by adopting the configuration of a second such embodiment, short overall length of the tap changer with the transformer 100 as compared with the conventional In other words, since it can be divided, it is possible to reduce the transport limitation dimension and the weight, and it is hard to be restricted by the loading at the time of on-site installation.

Embodiment 3 Embodiment 3 will be described with reference to FIG. In the figure, reference numeral 5 denotes a tap changer 4, and as shown in FIG. 5 of the conventional example, a tap changer portion tank 5f arranged in series in the major axis direction of the transformer main body 1 is connected to a transformer portion tank 5a and a flange. They are dividably connected at 5d and 5e. The width W ₃ of the tap changer unit tank 5f is
The dimension B of the tap changer 4 is set in consideration of securing a minimum space necessary for electrical insulation and connection work. As can be seen from the figure, since the dimension B of the tap changer 4 is usually smaller than the dimension A of the transformer coil, the width W _{3 of the} tap changer tank 5f is smaller than the width W of the transformer tank 5a. ing. Since the longitudinal dimension of the tap changer section tank 5f is also reduced, the transformer 100 with the tap changer is required.
Of the total length L ₃ can also be shorter than L ₁ shown in FIG. 5 of the prior art, lighter, it can provide a compact and economical tap changer with the transformer 100.

In the above-described first to third embodiments, the tap changer is described as an example of a load tap changer. However, the present invention can be applied to a non-voltage tap changer. Needless to say.

[0013]

Since the present invention is configured as described above, it has the following effects.

[0014] Since the two tap changers are arranged symmetrically with respect to the center line of the transformer and at an angle of less than 90 °, the total length is small, the amount of insulating oil is small, and the components are small. A transformer with a tap changer having a small number of points and a small installation area can be obtained.

Furthermore, there is provided a transformer section tank and a tap changer section tank which is dividably connected to the tank, wherein the tap changer is symmetrical with respect to the transformer center line and has a length of 90%.
With an angle of less than ゜, the overall length is shortened and it can be divided, so it is possible to reduce the transport limit dimensions and weight, and it is equipped with a tap changer that is less susceptible to installation restrictions during installation A transformer is obtained.

[0016] In addition, there is provided a transformer section tank and a tap changer section tank dividably coupled to the tank. Since the width of the tap changer section tank is smaller than the width of the transformer section tank, A lightweight, compact and economical transformer with tap changer can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a plan view showing a second embodiment of the present invention.

FIG. 3 is a plan view showing a third embodiment of the present invention.

FIG. 4 is a plan view showing one example of a conventional transformer with a tap changer.

FIG. 5 is a plan view showing another example of a conventional transformer with a tap changer.

[Explanation of symbols]

1 transformer body, 2 transformer coils, 3 transformer cores,
4 Tap changer, 5 Transformer main tank, 5a Transformer tank, 5b, 5c, 5f Tap changer tank, 5d, 5e flange, 100 Transformer with tap changer.

Claims (4)

[Claims] 1. A transformer main body tank containing a transformer and two tap changers, wherein the two tap changers are symmetrical with respect to a center line of the transformer and less than 90 °. A transformer with a tap changer, which is arranged at an angle. 2. A transformer, a transformer tank accommodating the transformer, and a splitter coupled to the transformer tank.
A tap changer unit tank accommodating two tap changers, wherein the tap changers are arranged symmetrically with respect to a center line of the transformer and at an angle of less than 90 °. Transformer with tap changer. 3. A transformer, a transformer section tank accommodating the transformer, and a splitter coupled to the transformer section tank.
A tap changer tank accommodating two tap changers, wherein a width dimension of the tap changer section tank is smaller than a width dimension of the transformer section tank. 4. The transformer with a tap changer according to claim 1, wherein the tap changer is a load tap changer or a non-voltage tap changer.