JPH0834157B2 - Three-winding Scott connection transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a three-winding Scott connection transformer.

[Conventional technology]

The arrangement of each winding of the main seat and T seat of the conventional three-winding type Scott connection transformer is shown in Fig. 19 to Fig. 2 of Electric Railway VOL.40 No. 11.
As shown at 1, the secondary and tertiary windings are located adjacent to the primary winding and on the same core leg as the primary winding.

Alternatively, the secondary and tertiary windings are wound around separate iron cores, as shown in Fig. 22 of the Electric Railway VOL.40 No.11. In this case, the primary windings are connected in parallel between the two iron cores.

[Problems to be Solved by the Invention]

In the Scott connection transformer in which the secondary winding and the tertiary winding of the above-mentioned prior art are arranged adjacent to the same legs as the primary winding, between the two windings (primary to secondary, primary to tertiary and secondary). There is a problem that the impedance of (~ between the tertiary windings) is affected by the adjacent other winding (in the case of the impedance between the primary and secondary windings, the adjacent tertiary winding).

Further, in the Scott connection transformer in which the secondary and tertiary windings are wound on the above-mentioned conventional separate iron core, two iron cores are required for each of the main seat winding and the T seat winding, and 4 wires are required for the Scott connection. Since the three-winding Scott connection transformer is constructed by the iron core, there is a problem that the weight and the size increase.

The present invention has been made in view of the above points, and an object of the present invention is to provide a three-winding type Scott connection transformer that facilitates adjustment of impedance between three windings and can reduce weight and size. It is what

[Means for solving the problem]

That is, in the present invention, the iron core is made into two independent two-leg iron cores, and the main seat and the T-seat winding are independently wound around the independent two-leg iron core, and the main seat and the T-seat winding are also wound. Is wound around each leg of the two-leg iron core, and one of the wound main seat and T seat winding has one of the main seat and the T seat winding.
The secondary winding, and the other primary winding, the main seat, T seat winding 3
The secondary windings were respectively wound in concentric circles, and the terminals were drawn out from the middle of the primary windings of the main seat winding wound around each leg, and were drawn out from one of the primary windings. A terminal connected to the end of the primary winding on one side of the T-end winding and a terminal drawn out from the middle of the other primary winding and the primary winding on the other side of the T-end winding. A Scott connection is made between the two iron cores so as to connect the ends of the wires to achieve the intended purpose.

[Action]

That is, in the three-winding Scott connection transformer formed in this way, the terminal drawn from the middle of one primary winding of the main seat winding and the primary winding on one side of the T seat winding. And a Scott connection in which the terminal drawn from the middle of the other primary winding of the main seat winding and the end of the primary winding on the other side of the T seat winding are connected. In other words, each terminal of the T-seat winding is connected without being connected to each terminal drawn from the middle of the main-seat primary winding.
Since it is connected to the secondary winding, there is no current interference between both primary windings provided in the main winding and between both primary windings provided in the T winding. , That is, the current distribution is uniform, and it is not necessary to consider the changing requirements for impedance adjustment, and therefore the impedance adjustment between the primary and secondary windings and between the primary and tertiary windings becomes easy. is there.

The secondary and tertiary windings of the main and T-seat windings are separately wound around the core legs of the two-leg core, and the primary winding is a two-leg parallel winding. Impedance between and 1
If the impedance between the secondary and secondary windings is the same, 2
The impedance between the secondary and tertiary windings can be set to twice the impedance of the primary and secondary windings or the impedance between the primary and tertiary windings, and impedance adjustment between the three windings is easy. Becomes

As a result, the impedance characteristics of the three-winding Scott connection transformer seen from the load side are ZT = ZF and
It can be ZN = 0. In addition, ZT, ZF, ZN is 1 for Z ₁₂
When the impedance between the secondary and secondary windings, Z ₁₃ is the impedance between the primary and tertiary windings, and Z ₂₃ is the impedance between the secondary and tertiary windings, Is the impedance defined by

〔Example〕

Hereinafter, the present invention will be described based on the illustrated embodiments.
FIG. 1 shows an embodiment of the present invention. In the three-winding Scott connection transformer having the main winding and the T winding as shown in the figure, in the present embodiment, the main winding and the T winding are independent iron cores (main iron core). 1, T-seat core 10) was wound separately, and a Scott connection was made between both cores. By doing this, the impedance between the primary and secondary windings and the impedance between the primary and tertiary windings can be adjusted independently, and the four iron cores are no longer required as in the conventional case, and the impedance between the three windings can be adjusted. It is possible to obtain a three-winding type Scott connection transformer that facilitates adjustment of, and can reduce weight and size.

That is, the main iron core 1 is configured to have the iron core legs 1a and 1b. The secondary winding 2 of the main winding is wound around the iron core leg 1a, the tertiary winding 3 of the main winding is wound around the iron core leg 1b, and the primary winding 4a of the main winding is formed. , 4b are the secondary and tertiary windings of each core leg 1a, 1b
It is wound concentrically with 2, 3 and is connected in parallel with terminals 5 and 6,
It is connected to U-phase 7 and W-phase 8 of three phases. Also, from the midpoint of the primary windings 4a and 4b, the M point terminal 9 connected to the T seat winding
c, 9d are pulled out.

The T-seat core 10 is composed of the core legs 10a and 10b like the main-seat core 1, the secondary winding 11 of the T-seat winding is wound around the core leg 10a, and the T-seat winding is formed on the core leg 10b. The third winding 12 of is wound,
The primary winding 13a, 13b of the T-seat winding is the secondary, 3 of each core leg 10a, 10b.
The coils are wound concentrically with the next windings 11 and 12, connected in parallel at a terminal 14, and connected to the V phase 15 of the three-phase power supply. Further, from the other ends of the primary windings 13a and 13b, M point terminals 13c and 13d of the T order winding connected to the M point terminals 9c and 9d of the main seat winding are drawn out.

The primary windings 4a, 4b, 13a, 13b between the main seat core 1 and the T seat core 10 are connected to each other by connecting the primary windings 4a, 4b, 13a, 13b to the M point terminals 9c and 1
3c is connected by a connecting line 16, and the other M point terminals 9d and 13d
And are connected by a connecting line 17 to form a Scott connection. By connecting in this way, a three-winding Scott connection transformer having two sets of Scott connection is constructed as a whole.

By doing so, it is possible to easily meet the demand for impedance characteristics on the load side of each of the main seat winding and the T seat winding.

As described above, according to this embodiment, the following effects can be obtained.

By using the main seat core and the T seat core as separate cores, and using each core as a two-leg core and winding the secondary winding and the tertiary winding on separate legs, between the primary and secondary windings and the primary winding. ~ The impedance between the tertiary windings can be adjusted independently.

Further, assuming that the impedance ratio between the primary and secondary windings and between the primary and tertiary windings is 1: 1, the impedance between the secondary and tertiary windings is 1 to 2 depending on the winding configuration. Since it is twice the impedance between the secondary windings or between primary and tertiary windings,
The impedance characteristic of the three-winding Scott connection transformer can be satisfied.

Also, because the main seat core and the T seat core are separate cores,
Since it can be divided in terms of transportation, it is possible to cope with severe transportation restrictions.

Further, comparing the weights of the three-winding Scott connection transformer of the present embodiment and the three-winding Scott connection transformer having the conventional winding configuration, this embodiment can be reduced to about 70% of the conventional example. it can.

In this embodiment, the main seat winding and the T seat winding are housed in independent tanks, but the main seat winding and the T seat winding can be housed in the same tank.

〔The invention's effect〕

As described above, according to the present invention, the impedance between the three windings can be easily adjusted, and the weight and the size can be reduced. Therefore, the impedance between the three windings can be easily adjusted and the weight and the size can be reduced. It is possible to obtain a possible three-winding Scott connection transformer.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of a three-winding Scott connection transformer of the present invention. 1 ... Main seat core, 1a, 1b ... Iron leg, 2 ... Main seat winding secondary winding, 3 ... Main seat winding tertiary winding, 4a, 4b ... Main seat winding Primary winding, 10 ... T seat iron core, 10a, 10b ... iron leg, 11 ... T seat secondary winding, 12 ... T seat tertiary winding, 13a, 13b ...... Primary winding of T-seat winding.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Fumiaki Abe 1-1-1 Kokubun-cho, Hitachi-shi, Ibaraki Inside Kokubun factory, Hitachi Ltd. (72) Inventor Kazuji Ishii 1-1-1 Kokubun-cho, Hitachi-shi, Ibaraki No. 1 in Hitachi Kokubun Plant, Ltd. (56) Reference JP-A-60-180107 (JP, A)

Claims (2)

[Claims] 1. A three-winding Scott connection transformer comprising a main seat winding, a T seat winding, and an iron core around which these windings are wound, wherein the iron core is formed of two independent two-leg iron cores. The main seat and the T seat winding are independently wound around the independent two-leg iron core, and the primary windings of the main seat and the T seat winding are wound around each leg of the two-leg iron core. And, the primary winding of the main seat and the T-seat winding, which is wound, has the secondary winding of the main seat and the T-seat winding, and the other primary winding has the main seat, Each of the tertiary windings of the T-seat winding is wound concentrically, and the terminals are led out from the middle of the primary winding of the main-seat winding wound on each leg, and the primary of one of them The terminal drawn from the winding and the T
A terminal connected to the end of the primary winding on one side of the counter winding and an end of the primary winding on the other side of the terminal and the terminal drawn out from the middle of the other primary winding A three-winding Scott connection transformer characterized in that a Scott connection is made between the two iron cores so as to be connected to the core. 2. The three-winding Scott connection transformer according to claim 1, wherein the main seat winding and the T seat winding are housed in separate tanks.