JPS5946410B2 - transformer equipment - Google Patents

Description

[Detailed description of the invention] A plurality of multiphase transformers of different types housed in the same outer box share mutually adjacent in-phase core yoke parts, and this common core yoke part The present invention relates to a transformer device in which a difference in main magnetic flux in each transformer core is passed through the transformer core.

The configuration of this type of conventional device will be explained below with reference to the drawings.

Note that this description will be made regarding a case where a three-phase voltage regulating transformer and a main transformer are housed in the same outer box.

In FIGS. 1 and 2, A is a voltage regulating transformer;
B is the main transformer, 1a and Ib are each winding of both transformers 8B, 2
a and 2b represent the respective iron cores of the transformers A and B, and φW and φW represent the magnetic fluxes flowing through the respective iron cores 2a and 2b (■!)W and the W phase.

Further, each core 2a, 2b has core legs 2al, 2, respectively.
bl and core yoke parts 2a2, 2a2. 4 is an outer box that houses both transformers A and B.

In the conventional transformer device, as mentioned above, each of the iron cores 2a and 2b forming the magnetic circuit of each transformer A and B is provided independently, so the required weight of the iron core is large, and the iron This method has disadvantages such as increased loss and increased size of the outer box. This invention has been made in order to eliminate the drawbacks of the above-mentioned conventional products, and the present invention has been made in order to solve the above-mentioned drawbacks of the conventional products. By making the core yoke common and passing the difference in the main magnetic flux in each transformer core through this common core yoke, the weight of the core is reduced and the external dimensions are reduced, resulting in an economical and efficient transformer. This enables the production of

DESCRIPTION OF THE PREFERRED EMBODIMENTS A transformer device according to an embodiment of the present invention will be described below with reference to the drawings.

In Figures 3 and 4, the voltage regulating transformer A, main transformer B, windings 1a, Ib, cores 2a, 2b) core yoke parts 2a2, 2b2 and outer box 4 are shown in Figures 1 and 4. Although it is similar to the conventional one in Fig. 2, the in-phase cores of both transformers A and B are provided adjacent to each other, and each core yoke part 3 is shared, and the main phase of both transformers A and B is The difference in magnetic flux (e.g. φW - φ
Only w) is allowed to flow. Therefore, the core cross-sectional area of the core yoke portion 3 can be made smaller than the other core yoke portions 2a2, 2b2, so that the required weight of the entire core is reduced and the external dimensions are also reduced. Next, the electrical principle of this invention will be explained.

FIG. 5 shows a wiring diagram for one phase (W, w phase) of the three-phase wiring between the voltage regulating transformer A and the main transformer B. Needless to say, the other phases are also connected in the same way. In the figure, 1a and 1b are the winding groups of both transformers A and B, 1a, 1a2 and 1a3 are the primary winding, secondary winding and secondary tap winding of voltage regulating transformer A, respectively. 1b2 is 1 of main transformer B
The primary winding and the secondary winding, EWl and EW2, represent the primary voltage and secondary voltage of the voltage regulating transformer A, and EWl and EW2 represent the primary voltage and secondary voltage of the main transformer B, respectively. In this wiring diagram, the primary voltage EWl of the voltage regulating transformer A shows a 100% constant applied voltage, and the secondary winding 1a
The induced voltage of the secondary tap winding 1a3 is set to 75% and the induced voltage of the secondary tap winding 1a3 is set to ±25%, and by switching the tap of the secondary tap winding 1a3, the secondary voltage EW2 is set to 100%.
This is an example in which voltage adjustment from 0/o to 50010 is possible. Therefore, the primary voltage EWl and secondary voltage EW2 of the main transformer B connected to this also vary from 100% to 50%.
The secondary output voltage EW2 of the main transformer B can be made variable from 100% to 50,010 by switching the secondary tap of the transformer A for regulating the public voltage. In this combination transformer, the excitation voltage EWl of the voltage regulating transformer A is constant at 1.00%, and the excitation voltage Ew of the main transformer B varies from 100010 to 50%.

Therefore, as shown in FIG. 6, if one phase of the main magnetic flux of both transformers A and B is φW and φW, and expressed as a vector, the main magnetic flux φW of voltage regulating transformer A is φW=1. , the main magnetic flux φw of the main transformer B can be expressed as φw=1 to 0.5.
These main magnetic fluxes φW and φw are the main magnetic fluxes that pass through the core yoke parts 2a2 and 2b2 of both transformers A and B, respectively, so by making the core yoke parts of the same phase common, a common iron core can be created. The differential magnetic flux φW−φw passes through the yoke portion 3, and the value of φW−Ww=0 to 0.5. In this way, by making the in-phase (U-U, -v-W-w) core yoke parts of both transformers A and B common, the in-phase core yoke parts, which were conventionally provided independently, can be 2a2 and 2b2 are combined into one, and since the magnetic flux passing through the common core yoke portion 3 is only the difference in the main magnetic flux, the core cross-sectional area can be made smaller than other core yoke portions. 7 and 8 show other embodiments in which the positions of the common iron core yoke portion 3 are different, and the windings of the same phase of the voltage regulating transformer A and the main transformer B are opposed to each other. Since the iron core yoke parts 3 which are arranged in parallel and adjacent to each other and are shared are provided in each phase, the same effect as in the above embodiment can be achieved.

As described above, according to the present invention, by making adjacent in-phase core yoke parts common, the weight of the core can be reduced and the external dimensions can be reduced compared to the conventional ones. Since the box is also smaller and the iron loss that occurs is naturally reduced, it becomes possible to manufacture an economical and efficient transformer device.

[Brief explanation of the drawing]

1 and 2 are a plan view and a side view showing an example of a conventional transformer device, and FIGS. 3 and 4 are a plan view and a side view showing a schematic configuration of a transformer device according to an embodiment of the present invention. Figures 5 and 6 show that the magnetic flux passing through the common iron core yoke becomes the difference φW - φw between the main magnetic fluxes φW and φw of voltage regulating transformer A and main transformer B, respectively. For the purpose of explanation, a wiring diagram of one phase W, w of both transformers A and B, a main magnetic flux vector diagram of one phase, and FIGS. 7 and 8 show a transformer device in another embodiment of the present invention. FIG. 2 is a plan view showing a schematic configuration. In the figure, A is the voltage regulating transformer, B is the main transformer, 1
a and 1b are windings, 2a and 2b are iron cores, 3 is a common iron core yoke, and φW and φw are main magnetic fluxes.

Claims (1)

[Claims] 1 Voltage regulating transformer consisting of U, V, and W phases, and u, v
, in which the corresponding phases (U and u, V and v, W and w) of the main transformer consisting of the w phase are connected to each other, and both of the above transformers are arranged and housed in the same outer box, the above In the iron cores of each phase of both transformers that are connected to each other, the iron cores of both transformers are integrated so that the yoke of the parts where the direction of magnetic flux is opposite is adjacent to be common to both transformers. A transformer device characterized by: