JPS5837972B2 - scott wiring transformer - Google Patents

Description

[Detailed description of the invention] The present invention relates to a Scott connection transformer.

Generally, a Scott connection transformer is used when it is desired to take a single-phase load from a Sanwa power supply using two single-phase transformers.

Conventionally, in a Scott connection transformer, for example, as shown in FIG. 1, the midpoint of the primary winding 3 of the main transformer is connected to one end of the primary winding 1 of the T-seat transformer.

2 is a secondary winding of a T-seat transformer having single-phase output terminals V and QV at both ends thereof.

Further, 4 is a secondary winding of the main transformer which is cross-connected to constitute a circulation circuit.

U, V, and W are input terminals connected to the Sanwa power supply, respectively.

In such a conventional Scott connection transformer, when a single-phase load is taken from the secondary winding 2 of the T-seat transformer, a load current flows through the secondary winding 2.

This load current is T due to the ampere-turn relationship.
induced in the primary winding 1 of the transformer.

The current induced in the primary winding 1 is shunted to the primary windings 3, 3 of the main transformer.

For example, if the load current of the secondary winding 2 is I2T, a current of ■1T flows through the primary winding 1, and a current of 'IT/2 flows through the primary windings 3 and 3 of the main transformer. Current is shunted.

Furthermore, the current flowing through the primary windings 3, 3 of the main transformer due to the load current of the secondary winding 2 also flows through the secondary windings 4, 4.

Therefore, in order to cancel the above-mentioned current flowing through the primary windings 3, 3, the secondary windings 4, 4 of the main transformer are cross-connected to allow a circulating current to flow. A winding configuration is adopted in which the circuit and load circuit are common.

However, in a Scott connection transformer with such a configuration, only a single type of voltage could be taken from the secondary side of the main transformer.

This is because when a tap is taken out between the secondary windings 4 and 4 to take an intermediate voltage load, the load current is induced in the primary windings 3 and flows to the primary windings 3 and 3. This is because the current balance of the primary current will be disrupted.

The present invention has been made to solve these conventional problems, and an object of the present invention is to provide a Scott connection transformer that can obtain two or more types of voltage from the secondary side of the main transformer.

Hereinafter, one embodiment of the present invention will be described in detail using FIG. 2.

The connection diagram of the Scott connection transformer of the present invention is shown in FIG. 2.
The secondary side of the T-seat transformer is similar to the conventional one shown in FIG.

In addition, the secondary side of the main transformer has two secondary windings 4a and 4b.
These secondary windings 4a, 4b are connected in a crosswise manner.

Then, an intermediate tap 6 for connecting a load is taken out from each of the adjacent secondary windings 4a, 4b, and the secondary windings 4a, 4b are connected to each other.
It is connected to output terminals u, m, and Ou together with other terminals of 4b.

On the other hand, the primary windings 3, 3 and the secondary windings 4a, 4 of the main transformer
Two built-in windings 5, 5 are interposed between the two built-in windings 5 and b.

The built-in windings 5, 5 are connected in an endless ring to form a circulation circuit.

In addition, the mechanical configuration of the winding in the above wiring diagram is as follows:
The built-in windings 5, 5 are wound around the magnetic core around which the windings of the main transformer are wound, and the secondary winding of the main transformer is placed above the built-in windings 5, 5, that is, on the outside. 4a and 4b are cross-connected and wound.

Next, the primary windings 3, 3 of the main transformer are wound around the outside of these secondary windings 4a, 4b.

In this way, the circuit that flows the circulating current and the circuit that supplies the load current are separated, and the circuit that flows the circulating current is not exposed to the outside but is built into the internal windings 5, 5, and the circuit that supplies the load current is provided with an intermediate circuit. By providing the tap 6 and taking out the intermediate potential, two or more voltages can be obtained from the secondary side of the main transformer.

As described above, the Scott connection transformer of the present invention has a built-in winding that constitutes a circulation circuit for canceling the current flowing in the primary winding of the main transformer on the magnetic core around which the winding of the main transformer is wound. A wire is wound and connected endlessly, and a plurality of secondary windings of the main transformer are cross-connected and wound on the outside of the built-in winding, and
Intermediate taps for load connection are taken out between each of these secondary windings, and the primary winding of the main transformer is wound around the outside of these secondary windings, so the secondary winding of the main transformer Two or more voltages can be easily obtained from

[Brief explanation of the drawing]

FIG. 1 is a wiring diagram of a conventional Scott connection transformer, and FIG. 2 is a wiring diagram showing an embodiment of the Scott connection transformer of the present invention. 3, 3... Primary winding of main transformer, 4a,
4b... Secondary winding of main transformer, 5, 5...
...Built-in winding, 6...Intermediate tap.

Claims (1)

[Claims] 1 of the main transformer on the magnetic core around which the winding of the main transformer is wound.
A built-in winding that constitutes a circulation circuit for canceling the current flowing to the next winding is wound and connected endlessly, and multiple secondary windings of the main transformer are cross-connected to the outside of the built-in winding. At the same time, an intermediate tap for load connection is taken out between each of these secondary windings, and one of the main transformer is connected to the outside of these secondary windings.
A Scot-to-connection transformer characterized by a secondary winding.