JP3533252B2 - Transformer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises two sets of three-phase wiring (three-phase transformer) by using three two-leg iron cores having two sets of windings arranged concentrically on each leg. Concerning the transformer to do.

[0002]

2. Description of the Related Art FIG. 5 shows a structure of a transformer body having two winding pairs in which a low voltage winding and a high voltage winding are concentrically arranged, which is used for such a three-phase connection. In FIG. 5, each leg of the two-legged core 2 formed of the wound core of the transformer body 1 is
A sheet-shaped low-voltage winding 3 made of copper or aluminum is wound in a rectangular tube shape by superposing insulating materials (not shown) inserted between the turns. On the outer circumference of the low-voltage winding 3, a rectangular wire or a round wire whose surface is insulated is wound in the axial direction, and the winding layers are sequentially laminated in the outer circumferential direction with an interlayer insulator (not shown) interposed therebetween. The high-voltage winding 4 is arranged, and thus a multi-angle tubular winding is formed. Also,
An upper clamp 5a is fitted to the upper part of the two-leg iron core 2, and a lower clamp 5a 'is fitted to the lower part.

An example of a structure in which two sets of three-phase connections are formed by using three transformer main bodies 1 is a 12-phase rectifier circuit used for power conversion, for example, and a circuit diagram thereof is shown in FIG.
In FIG. 6, the three-phase transformer 6 is Δ-Δ connected, and the three-phase transformer 7 is ΔY connected, and there is a phase difference of 30 degrees between the two angular displacements.

A wiring diagram of these three-phase transformers 6 and 7 is shown in FIG.
Shown in. In FIG. 7, three high voltage windings 4a, which are primary windings wound around one leg of each of the two-leg iron cores 2a to 2c of the transformer main bodies 1a to 1c having the same configuration as the transformer main body 1.
To 4c are Δ-connected, and the high voltage windings 4a to 4c
Three low voltage windings 3a to 3 which are secondary windings paired with c
c is also Δ-connected. Therefore, three winding pairs 8 to 1
0 is Δ-Δ connected, and thus the three-phase transformer 6 is configured.

On the other hand, the three high-voltage windings 4d to 4f wound around the other leg of each of the two-leg iron cores 2a to 2c are Δ-connected and also form a pair with the high-voltage windings 4d to 4f. The low voltage windings 3d to 3f are Y-connected. Therefore, 3
The individual winding pairs 11 to 13 are Δ-Y connected, and thus the three-phase transformer 7 is configured.

The low-voltage windings 3a to 3c of the three-phase transformer 6 are connected to the input terminals of the three-phase bridge rectifier circuit 14, and the low-voltage windings 3d to 3f of the three-phase transformer 7 are three-phase bridge rectifier circuit 15. Is connected to the input terminal of. Also, 3
An interphase reactor 16 is connected between the cathode side output terminals of the phase bridge rectifier circuits 14 and 15, a midpoint tap 16a of the interphase reactor 16 is connected to the positive side DC output terminal 17, and the directly connected anode side output terminal is It is connected to the negative side DC output terminal 18. Therefore, 12-phase rectifier circuit 1
9 are configured.

In the case of constructing such a 12-phase rectifier circuit 19, there are two configurations for arranging the three transformer bodies 1a to 1c. In the first configuration, as shown in FIG. 8 (a), three transformer bodies 1a to 1c are arranged so that the legs of the two-leg iron cores 2a to 2c are laterally aligned. The second configuration is, as shown in FIG.
The three transformer bodies 1a to 1c are arranged so that the windows of the two-leg iron cores 2a to 2c face each other.

The first structure is not often used because the length in the arrangement direction becomes too long, and the second structure is generally adopted. For example, in the case of an oil-filled transformer, the transformer main body 1 is used.
a to 1c are housed in one tank in a state where the upper clamps 5a to 5c are connected by two connecting members 20, and the tank is filled with insulating oil.

[0009]

However, the leads 3 of the low-voltage windings 3a to 3f of the respective transformer bodies 1a to 1c are to be solved.
aa to 3ff and high voltage windings 4a to 4f lead 4aa
To 4ff are located on the opposite sides of the leg portions of the two-leg iron cores 2a to 2c. Therefore, FIG. 8 (b)
In the arrangement configuration shown in Fig. 7, in order to perform the three-phase connection by the lead wire as shown in Fig. 7, in order to maintain the insulation distance between the lead wire and the connecting member 20, the lead wire may bypass the connecting member 20, It was necessary to provide a wide space between the transformer bodies 1a to 1c. For this reason, this extra space leads to an increase in the size and weight of the entire oil-filled transformer. In addition, the length of the lead wire required for laying out each lead wire also becomes long, which causes an increase in load loss.

Moreover, in the case of an oil-filled transformer, the amount of insulating oil increases by the size of the oil-filled transformer, which makes it expensive, and also causes further weight reduction. The present invention solves the above-mentioned problems, and an object thereof is to construct two sets of three-phase wiring by using three two-leg iron cores in which a low-voltage winding and a high-voltage winding are concentrically arranged in each leg. In addition, there is a need for a transformer that does not require extra space, can be made smaller and lighter overall, and can reduce load loss due to lead wires.

[0011]

In order to solve the above problems, a transformer according to claim 1 has three two-leg iron cores, and low-voltage windings and high-voltage windings on the legs of the three two-leg iron cores. 6 pairs of windings in which the wires are concentrically arranged, and 2 from the 6 pairs of windings
In a set of three-phase connection, three two-leg iron cores are arranged so that their windows face each other and are connected by a connecting member, and the lead of the winding pair is arranged on the side opposite to the window of the two-leg iron core. It is characterized by that.

In this case, the high-voltage winding of the winding pair may be formed in a rectangular tube shape, and the outlet of the high-voltage winding may be arranged near the corner portion of the two-leg core on the side opposite to the window (claim 2). In addition, the two-leg iron core is configured by a wound iron core, the low-voltage winding of the winding pair is configured in a rectangular tube shape, and the conductor width of the lead wire of the low-voltage winding is made narrower than the iron-core width of the two-leg iron core, and A solid insulator may be inserted between the winding pairs of each two-leg iron core (claim 3).

Further, the two-leg iron core is constituted by a laminated iron core, the low-voltage winding of the winding pair is constituted in a rectangular tube shape, and the conductor width of the lead of the low-voltage winding is made narrower than the laminated thickness of the two-leg iron core. And each 2
A solid insulator may be inserted between the pair of windings of the leg core (claim 4). The high-voltage winding may have a tap lead, and the tap lead may be arranged on the side opposite to the window of the two-leg iron core (claim 5). Further, the high-voltage winding of the winding pair may be formed in a rectangular tube shape, and the tap opening thereof may be arranged near the corner portion of the two-leg iron core on the side opposite to the window (claim 6).

[0014]

According to the transformer of the first aspect, the three two-leg iron cores connected by the connecting members are arranged so that their windows face each other, and the lead-out of each winding pair is reversed from the two-leg iron core. Since it is arranged on the window side, it is possible to secure a space necessary for wiring with lead wires without providing a wide space between the two-leg iron cores.

When the high-voltage winding is formed in a rectangular tube shape and the lead-out of the high-voltage winding is arranged near the corner of the two-leg core on the side opposite to the window, the high-voltage windings of the adjacent two-leg cores The space between the corners can also be used for wiring the lead wire (claim 2).

Further, when the two-leg iron core is composed of a wound iron core, the conductor width of the lead wire of the low-voltage winding is made narrower than the iron core width of the two-leg iron core, and when the two-leg iron core is composed of a laminated iron core. If the conductor width of the lead wire of the low-voltage winding is made narrower than the product thickness of the two-leg core, and a solid insulator is inserted between the winding pairs of each two-leg core, a short-circuit accident will occur. The distortion of the winding can be suppressed (claims 3 and 4).

When the high-voltage winding of the winding pair has a tap lead, if the tap lead is arranged on the counter window side or the corner portion on the counter window side of the two-leg iron core, the wiring of the lead wire for the tap lead is unnecessary. It can be performed without requiring space (claims 5 and 6).

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. In FIG. 1, which shows a top view of a connected state of a transformer such as an oil-filled transformer in the case of configuring a 12-phase rectifier circuit, the low-voltage winding 22 of the transformer body 21 is the conventional transformer body 1 shown in FIG. Similarly to the above, a sheet-shaped conductor made of copper or aluminum is formed into a rectangular tube shape by superposing an insulator (not shown) inserted between the turns on each leg of the two-leg iron core 23 formed of a wound iron core. For example, it is configured by being wound in a rectangular tubular shape.

The lead 22a is formed by laminating a required number of thin plate-shaped conductors, and the conductor width of the lead 22a is smaller than the core width of the two-leg iron core 23. There is. The lead-out 22a is arranged on the counter-window side of the two-leg iron core 23, so that the counter-window-side portion 22A of the low-voltage winding 22 is gently curved in a convex shape.

The high-voltage winding 24 of the transformer main body 21 is also wound around the outer periphery of the low-voltage winding 22 in the axial direction in the same manner as the conventional transformer main body 1 shown in FIG. The wound winding layer is sequentially laminated in the outer peripheral direction through an interlayer insulator (not shown) to form a rectangular tube shape that is a rectangular tube shape.
Thus, the multi-angle tube winding is constructed. The lead-out 24a is arranged near the corner of the counter-window side portion 24A of the high-voltage winding 24. The low-voltage winding 22 and the high-voltage winding 24 form a winding pair 25.

The high-voltage winding 24 has a tap outlet 24.
It has a plurality of b, for example, three, and tap taps 24
b is arranged in the vicinity of the corner of the counter window side portion 24A so that its position is slightly different from that of the high voltage winding lead wire 24a. In addition, in FIG. 1, the three tap leads 24b are illustrated as being juxtaposed with each other, but in reality, the high voltage windings 24 are provided at different numbers of turns.

Transformer main body 2 constructed as described above
3 are arranged so that the windows 23a of the two-leg iron core 23 face each other, and the upper clamp 26 portions thereof are connected by the two connecting members 27, so that the two winding pairs 25 form two sets. A set of three-phase connections, for example, a Δ-Δ connection and a Δ-Y connection to form a 12-phase rectification circuit, are performed, and these are stored in one tank, and then the tank is filled with insulating oil. An oil-filled transformer (transformer) 28 is configured.

As described above, according to this embodiment, the low voltage winding 2
The outlets 22a of 2 and the outlets 24a of the high voltage windings 24 and the tap outlets 24b are all on the counter window side of the two-leg iron core 23, that is, the portion 22A on the counter window side of the low voltage winding 22 and the portion 24A on the counter window side of the high voltage winding 24. Since it is located in
Each of these leads is inevitably separated from the connecting member 27, and the necessary insulation dimensions have already been secured for this. Therefore, when connecting the leads to each other by a lead wire (not shown), it suffices to secure a minimum dimension required for insulation between the high voltage windings 24 between the transformer main bodies 21, as in the conventional case. There is no need to provide a large space for wiring. Therefore, the oil-filled transformer 28 itself can be made small and lightweight. Further, the wiring around the lead wire can be performed in the shortest distance, and the load loss due to the lead wire can be reduced.

Further, according to this embodiment, the lead-outs 24a and the tap-outs 24b of the high-voltage winding 24 are arranged on the side opposite to the window of the two-leg iron core 23, that is, near the corner of the portion 24A on the side opposite to the window of the high-voltage winding 24. Therefore, in the wiring using the lead wires of the lead wire 24a and the tap lead wire 24b, the space between the corner portions of the high voltage windings 24, 24 of the adjacent transformer main bodies 21, 21 can be used, and the wiring can be facilitated. Become.

Moreover, in the case of the oil-filled transformer 28, the amount of insulating oil filled in the tank can be reduced by the amount which can be made smaller than the conventional one, which can be achieved at low cost. It is possible to further reduce the weight.

By the way, FIG. 2 is a cross-sectional view of one leg portion 23b of the two-leg iron core 23 in the transformer main body 21, and has a rectangular cross-section when a short-circuit accident occurs on the secondary side of the oil-filled transformer 28. The low-voltage winding 22 and the high-voltage winding 24, which are wound around the leg portion 23b in a rectangular tube shape and are concentrically arranged, are in a state of being deformed by electromagnetic mechanical force. The leads of the windings 22 and 24 are omitted.

The currents flowing through the windings 22 and 24 at the time of a short circuit have opposite directions in the low-voltage winding 22 and the high-voltage winding 24, and the electromagnetic mechanical force is generated between the windings 22 and 24 in a mutually repulsive direction. Works. That is, the low voltage winding 22 tends to deform toward the inside as shown by the dotted line, and the high voltage winding 24 tends to deform toward the outside as shown by the dotted line.

FIG. 3 shows a second embodiment of the present invention, and the same parts as those in the first embodiment are designated by the same reference numerals.
In FIG. 3, between the winding pairs 25, 25 of the two-leg iron core 23 of the transformer main body 21, a thick plate-shaped solid insulator 29 made of, for example, resin having a certain degree of rigidity is inserted. Has become. Also, although it is a general configuration,
The cross-sectional shape of the two-leg iron core 23 made of a wound iron core has a winding thickness D
Is smaller than the iron core width W.

Next, the operation of the second embodiment will be described. In the case where the oil-immersed transformer 28 of the first embodiment is constituted by using three transformer main bodies 21 having the above-mentioned constitution, it is considered that a short-circuit accident occurs on the secondary side of the oil-immersed transformer 28. Also 2
The deformation of the high voltage winding 24 in the window 23a of the leg core 23 as shown in FIG. 2 is suppressed by the solid insulator 29 being interposed.

Further, in the portions 22A and 24A on the opposite side of the low voltage winding 22 and the high voltage winding 24, as shown in the first embodiment, the conductor width dimension Wa of the lead 22a is the iron core width W of the two-leg iron core 23. The low voltage winding 22 is configured to be narrower.
And a portion 22A of the high voltage winding 24 on the side opposite to the long side
Since 24A and 24A are curved in a convex shape in advance, this portion 2
The deforming forces in 2A and 24A are converted to tensile forces generated in the conductors of the respective portions 22A and 24A, and are similarly suppressed. And each winding 22 and 2
As for the remaining two sides (shorter sides) 22B and 24B of No. 4, as described above, the winding thickness D is smaller than the core width W, and the length of the straight portion of the two sides 22B and 24B is short. As a result, the proof stress against deformation is secured.

As described above, according to the second embodiment, in the transformer main body 21, the conductor width dimension Wa of the lead 22a of the low voltage winding 22 arranged on the side opposite to the window of the two-leg iron core 23 is set to the two-leg iron core 23.
Of the two-leg iron core 23 and a solid insulator 29 interposed between the winding pairs 25, 25 of the two-leg iron core 23. Therefore, a short circuit occurs on the secondary side of the oil-filled transformer 28. Even if an accident occurs, it is possible to suppress distortion caused by the electromagnetic mechanical force generated between both the low voltage winding 22 and the high voltage winding 24.

In the second embodiment, the two-leg iron core 23 is composed of a wound core, but in the case of a laminated core, as shown in FIG.
If the conductor width dimension Wa of the lead wire 22a is smaller than the product thickness D'as shown in FIG.
The proof stress against deformation of the window 23a side and the non-window side portions 22A and 24A of No. 5 and the other two sides 22B and 24B is similarly secured.

The present invention is not limited to the embodiments described above and shown in the drawings, but the following modifications are possible. The outlet 24a and the tap outlet 24b of the high-voltage winding 24 are arranged on the side opposite to the window of the two-leg iron core 23, that is, near the corner of the portion 24A on the other side of the window. Each may be arranged at any position on the window side. Also, the high voltage winding 24
It may be applied to a transformer without tap tap. Furthermore, although the winding pair 25 is formed in a rectangular tube shape that is a square tube shape, one of the winding pairs may be formed in a cylindrical shape, and in short, each lead wire may be arranged on the side opposite to the window of the iron core.

Furthermore, the tap outlet 2 of the high-voltage winding 24
Although the number of 4b is three, the number may be less or more than this. In addition, two sets of three-phase connections were applied to the 12-phase rectifier circuit as Δ-Δ and Δ-Y connections, but the combination of three-phase connections is not limited to this, and any combination is possible depending on the purpose. Is. The transformer is not limited to the oil-filled transformer 28, but may be a gas-insulated transformer, a dry transformer, or a resin-molded transformer.

[0035]

Since the present invention is as described above,
The following effects are achieved. According to the transformer of claim 1,
The windows of the three-legged iron cores connected by the connecting members are arranged so as to face each other, and the leads of each winding pair are arranged on the side opposite to the windows of the two-legged iron core, so that the size and weight can be reduced. In addition, the load loss due to the lead wire can be reduced.

According to the transformer of the second aspect, the winding pair is formed in a rectangular tube shape, and the high voltage winding of the winding pair is arranged near the corner of the two-leg core on the side opposite to the window. The space between the corners of the high-voltage winding can be used for the wiring of the lead wire.

According to the transformers of claims 3 and 4, 2
When the leg core is composed of a wound core, the conductor width of the lead wire of the low-voltage winding is made narrower than that of the two-leg core, and
When the leg core is composed of a laminated core, the conductor width of the lead wire of the low-voltage winding is narrower than the laminated thickness of the two-leg core, and a solid insulator is inserted between the winding pairs of each two-leg core. Therefore, when a short-circuit accident occurs, the distortion of the winding can be suppressed.

According to the transformers of claims 5 and 6, when the high voltage windings of the winding pair have tap openings,
Since the tap lead-out is arranged on the counter window side of the two-leg iron core or in the vicinity of the corner on the counter-window side, the lead wire can be wired to the tap lead-out without requiring an extra space.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a deformed state of a winding pair when a short circuit accident occurs on the secondary side.

FIG. 3 is a partial top view showing a second embodiment of the present invention.

FIG. 4 is a view corresponding to FIG. 3 when the two-leg iron core is formed of a laminated iron core.

FIG. 5 is a perspective view of a transformer body showing a conventional example.

FIG. 6 is a circuit diagram of a 12-phase rectifier circuit.

FIG. 7 is a wiring diagram of a transformer when configuring a 12-phase rectifier circuit.

FIG. 8 is a view corresponding to FIG. 1 of a conventional example.

[Explanation of symbols]

21 is a transformer main body, 22 is a low voltage winding, 22A is a part on the side opposite to the window, 22a is a lead, 23 is a two-leg iron core, 23a is a window,
24 is a high-voltage winding, 24A is a portion on the opposite side of the window, 24a is a lead, 24b is a tap, 25 is a winding pair, 27 is a connecting member, 28 is an oil-filled transformer (transformer), and 29 is a solid insulator. Show.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-314626 (JP, A) JP-A-53-68822 (JP, A) JP-A-59-169117 (JP, A) Jitsukaihei 4- 82823 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01F 30/00-38/42 H01F 27/28

Claims (6)

(57) [Claims] 1. A three-legged iron core, and six winding pairs in which low-voltage windings and high-voltage windings are concentrically arranged on the legs of the three two-legged iron cores. In a transformer that constitutes two sets of three-phase connection from a wire pair, the three two-leg iron cores are arranged so that their windows face each other and are connected by a connecting member, and two leads of the winding pair are connected. A transformer characterized by being placed on the opposite side of the iron core from the window. 2. The high voltage winding of the winding pair is formed in a rectangular tube shape,
The transformer according to claim 1, wherein the lead-out of the high-voltage winding is arranged in the vicinity of a corner of the two-leg core on the side opposite to the window. 3. The two-leg iron core is formed of a wound iron core, the low-voltage winding of the winding pair is formed in a rectangular tube shape, and the conductor width of the lead wire of the low-voltage winding is narrower than the iron-core width of the two-leg iron core. And each 2
3. The transformer according to claim 1, wherein a solid insulator is inserted between the pair of windings of the leg iron core. 4. The two-leg iron core is formed of a laminated iron core, the low-voltage winding of the winding pair is formed in a rectangular tube shape, and the conductor width of the lead wire of the low-voltage winding is narrower than the laminated thickness of the two-leg iron core, The transformer according to claim 1 or 2, wherein a solid insulator is inserted between the winding pairs of each two-leg iron core. 5. The transformer according to claim 1, wherein the high-voltage winding has a tap lead, and the tap lead is arranged on the side opposite to the window of the two-leg iron core. 6. The high voltage winding of the winding pair is formed in a rectangular tube shape,
6. The transformer according to claim 5, wherein the tap outlet of the high-voltage winding is arranged in the vicinity of a corner of the two-leg iron core on the side opposite to the window.