JP2676901B2 - Three-winding Scott connection transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a Scott connection transformer used as a feeder transformer.

B. SUMMARY OF THE INVENTION The present invention is a three-winding Scott connection transformer for feed, in which the main-stage secondary winding is sequentially attached to the iron core leg for the main-stage transformer from the inside.
Primary U-phase winding, primary U-phase and primary W-phase parallel winding main seat primary tap winding, primary W-phase winding and main-tertiary tertiary winding are arranged and wound to perform main transformer transformation. This is a three-winding Scott connection transformer with good balance of ampere-turn by each tap, small axial short-circuit mechanical force, and easy to manufacture.

In addition, a T-seat secondary winding, a primary V-tap winding that is a primary V-phase parallel winding, and a primary V
By arranging and winding the phase winding and the tertiary winding of the T-seat, the ampere-turn due to each tap of the T-seat transformer is well balanced, the short-circuit mechanical force in the axial direction is small, and the three windings are easy to manufacture. It is a Scott connection transformer.

C. Conventional Technology Fig. 3 is a wiring diagram of a conventional three-winding Scott connection transformer, which is the primary U-phase winding connected to the primary U terminal of the main transformer.
A tap lead wire 15 is drawn out from the central portion of 14 and the other end of the primary U-phase winding 14 is connected to the primary side neutral point M of the main transformer.

Similarly, the primary W connected to the primary W terminal of the main transformer
A tap lead wire 17 is drawn out from the center of the phase winding 16, and the other end of the primary W-phase winding 16 is connected to the primary side neutral point M of the main transformer. A main seat secondary winding 18 is wound around the primary U-phase winding 14, and a main seat tertiary winding 19 is wound around the primary W-phase winding 16. The arrangement of each winding will be described later.

When the primary terminal voltage is E ₁ , the primary U-phase winding 14 shares E _1/2 and the primary W winding 16 shares E _1/2 .

On the other hand, a tap lead wire 21 is drawn out from the central portion of the primary V-phase winding 20 connected to the primary V-terminal of the T-seat transformer, and the other end of the primary V-phase winding 20 is connected to the primary V-phase winding 20. It is connected to the side neutral point M. A T-seat secondary winding 22 and a T-seat tertiary winding 23 are correspondingly wound around the primary V-phase winding 20. The arrangement of each winding will be described later.

Primary V phase winding 20 Are shared. If the secondary terminal voltage and the tertiary terminal voltage are E ₂ , then E ₂ is induced in the main seat secondary winding 18, main seat tertiary winding 19, T seat secondary winding 22 and T seat tertiary winding 23, respectively. To do.

Fig. 4 is a winding layout of a conventional three-winding Scott connection transformer. In Fig. 4, the main core secondary leg winding 18 and the primary U-phase winding are arranged on the iron core leg 24 for the main transformer in order from the inside. A wire 14, a primary W-phase winding 16, and a main seat tertiary winding 19 are arranged and wound. A T-seat transformer iron core leg 25 is wound with a secondary seat winding 22, a primary V-phase winding 20, and a T-seat tertiary winding 23 arranged in this order from the inside.

D. Problem to be Solved by the Invention In the conventional three-winding Scott connection transformer, the tap lead is pulled out from the main winding, which requires a lot of work from the work side.

When the tap winding is partially used, the ampere turns are unbalanced and the short-circuit mechanical force is large.

Due to the insulation of the lead portion of the tap lead wire, the dimension in the radial direction of the winding becomes large.

And other issues.

The present invention solves the above problems of the conventional technique, improves the balance of ampere-turns, has a small axial short-circuit mechanical force, and is small in size. The purpose is to provide a transformer.

E. Means for Solving the Problems In order to achieve the above object, in the three-winding Scott connection transformer in the present invention, the tap winding is an independent separate winding, the tap winding is a parallel winding, The primary U-phase and primary W-phase tap windings of the main transformer are common parallel windings to form one main seat primary tap winding.

F. Action The three-winding Scott winding transformer of the present invention is more effective than the structure in which taps are drawn from the main winding by making the tap windings of the main transformer and the T-seat transformer separate windings in parallel. It is easy to perform and is particularly effective when the number of taps is large. By separately winding the tap winding, the dimensions for insulation can be small. Also, since the tap windings are wound in parallel,
Even when the tap is removed, the ampere-turn between the windings is well balanced, and the short-circuit mechanical force in the axial direction is small. Furthermore, since the primary tap winding is a single winding as the primary U-phase and primary W-phase common parallel windings, it is advantageous in terms of manufacturing and insulation dimensions rather than having separate windings for the U-phase and W-phase. Becomes

G. Example Hereinafter, an example of a three-winding Scott connection transformer according to the present invention will be described with reference to the drawings.

FIG. 1 is a connection diagram (in the case of 2 taps) showing an embodiment of a three-winding coil and a Scott transformer according to the present invention.
The other end of the primary U-phase winding 1 connected to the terminal is connected to one end of the primary U-tap winding 2, and the other end of the primary U-tap winding 2 is connected to the primary side neutral point M of the main transformer. It is connected.

Similarly, the primary W connected to the primary W terminal of the main transformer
The other end of the phase winding 3 is connected to one end of the primary W tap winding 4, and the other end of the primary W tap winding 4 is connected to the primary side neutral point M of the main transformer. This primary side neutral point M
For tap switching of, each phase moves by one tap in this connection diagram. Therefore, the tap windings are the same for the U phase and the W phase.

A main seat secondary winding 5 is wound around the primary U-phase winding 1 and a main seat tertiary winding 6 is wound around the primary W-phase winding 3. The arrangement of each winding will be described later.

When the primary terminal voltage E _1, the primary U winding 1 and primary U tap winding 2 is the E _1/2, the primary W-phase winding 3 and the primary W tap winding 4 share the E _1/2.

On the other hand, the other end of the primary V-phase winding 7 connected to the primary V terminal of the T-seat transformer is connected to one end of the primary V tap winding 8,
The other end of the primary V tap winding 8 is connected to the primary side neutral point M of the main transformer. A T-seat secondary winding 9 and a T-seat tertiary winding 10 are correspondingly wound around the primary V-phase winding 7. The arrangement of each winding will be described later.

With the primary V phase winding 7 and the primary V tap winding 8 Are shared.

When the secondary terminal voltage and the tertiary terminal voltage are E ₂ , E ₂ is induced in the main seat secondary winding 5, main seat tertiary winding 6, T seat secondary winding 9 and T seat tertiary winding 10, respectively. To do.

FIG. 2 is a winding arrangement diagram showing an embodiment of a three-winding Scott connection transformer of the present invention. In FIG. 2, a main seat secondary winding 5 and Primary U-phase winding 1, primary U-tap winding 2 and primary W-tap winding 3 are arranged in parallel, main winding primary tap winding 12, primary W-phase winding 3, and main tertiary winding 6 are arranged and wound. It is equipped.

A T-seat secondary winding 9, a primary V-tap winding 8, a primary V-phase winding 7, and a T-seat tertiary winding 10 are arranged in this order from the inside on the iron core 13 for a T-seat transformer. .

H. Effects of the Invention The present invention is configured as described above, and since the tap windings of the main transformer and the T-seat transformer are separate parallel windings, it is more workable than drawing the taps from the main winding. Easy to. This is particularly effective when the number of taps is large.

Since the tap winding is separately wound, the dimension for tap insulation is reduced and the dimension is reduced in the radial direction of the winding.

Since the tap windings are wound in parallel, the ampere turns are well balanced between the windings even when the taps are pulled out, and the short-circuit mechanical force in the axial direction is reduced.

Since the tap winding is a single winding as the U-phase and W-phase common parallel windings, it is advantageous in terms of manufacturing and insulation dimensions as compared with the case where the U-phase and W-phase are separate windings.

The impedance characteristic of each winding is also good.

And other effects.

[Brief description of the drawings]

FIG. 1 is a connection diagram showing an embodiment of a three-winding Scott connection transformer of the present invention, FIG. 2 is a winding arrangement diagram of the three-winding Scott connection transformer of the present invention, and FIG. Fig. 4 is a wiring diagram of a wire Scott connection transformer, and Fig. 4 is a winding arrangement diagram of a conventional three-winding Scott connection transformer. 1 ... Primary U-phase winding, 2 ... Primary U-tap winding, 3 ... Primary W-phase winding, 4 ... Primary W-tap winding 5 ... Main seat Secondary winding, 6 ... Main seat Tertiary winding, 7 ... Primary V phase winding, 8 ... Primary V tap winding, 9 ... T seat secondary winding, 10 ... T seat tertiary winding, 11 ... Main seat transformer core leg , 12 ...... Main seat primary tap winding, 13 ...... T core transformer core leg, M ...... Main seat transformer primary side neutral point.

Claims (2)

(57) [Claims] 1. A three-winding Scott-connected transformer, in which a main transformer and a T-seat transformer each include a primary winding, a primary tap winding, a secondary winding, and a tertiary winding, wherein an iron core leg for the main transformer is used. The main seat secondary winding, the primary U-phase winding, and the main seat primary tap winding, the primary W-phase winding, and the main tertiary winding that are parallel windings common to the primary U-phase and the primary W-phase are arranged in order from the inside. A three-winding Scott connection transformer characterized by being wound and wound. 2. A T-seat secondary winding, a primary V-tap winding in which primary V-phase parallel windings, a primary V-phase winding, and a T-seat tertiary winding are arranged in this order from the inside on an iron core leg for a T-seat transformer. The three-winding Scott connection transformer according to claim 1, characterized in that the three-winding Scott connection transformer.