JPS5924528B2 - transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transformer having a so-called split winding consisting of two circuits in which either one of the high and low voltage windings is connected to two independent circuits, and the other winding has a tap. Concerning vessels.

Conventionally, split winding transformers often have two circuits on the low voltage side and a tap on the high voltage side.

In this case, it is necessary to match the %IZ between the low voltage winding and the high voltage winding on one side and between the low voltage winding and the high voltage winding on the other side. If the voltage class of the high voltage side winding is relatively low and the tap range is narrow, the %IZ of both can be matched by placing a tap directly on the high voltage side winding and placing each low voltage side winding on both the inside and outside of the tap. is easy. When the voltage class of the high-voltage side winding is high, it is difficult to draw out the tap lead wire from between the main gap between the high and low voltage windings, and when the tap range is wide,
Since the tapped portion of the high-voltage winding comes off, a large imbalance occurs in the radial magnetic flux between the high- and low-voltage windings, resulting in a mechanical force problem in the event of a short circuit.

Therefore, in such a case, it becomes necessary to use a separate winding for the tap.

However, when the tap winding is made into a separate winding, due to the reasons described later, the above-mentioned 96IZ is different depending on the tap position.
However, there were very different drawbacks. That is, in FIG. 1, the split winding transformer has terminals u, ri, and ri on the low voltage side.
The low-voltage winding 1 is connected to the terminal U2, and the low-voltage winding 2 is connected to the terminals U2 and V2.The low-voltage winding 1 and 2 are connected to two independent circuits. It is something that

Further, the high voltage side includes a high voltage side main winding 3 connected to terminals U and To (Po) and a high voltage side tap winding 4 having terminals P, , P2, and T1 to T5. The high voltage side tap winding 4 is of a so-called polarity switching system, with terminal V being connected to terminal T. When connected to the center tap, the tap position is the center tap, and the terminal Po is the terminal P1.
When the terminal V is connected to the terminal Tl, the tap position is the highest tap, the terminal Po is connected to the terminal P2, and the terminal is connected to the terminal T.
The tap position when connected to l is the lowest tap. FIG. 2a shows an example of a conventional winding arrangement diagram of a transformer having the wiring shown in FIG. , a low voltage side winding 2, and a high voltage side tab winding 4 are arranged concentrically.

Figure 2b shows the leakage flux distribution between the low voltage side winding 1, high voltage side main winding 3, and high voltage side tap winding 4. Figure 2c shows the leakage flux distribution between the low voltage side winding 2, the high voltage side main winding 3, and the high voltage side tap winding 4. The leakage magnetic flux distribution between the side tab windings 4 is shown. Incidentally, the percent impedance %IZ between the transformer windings is approximately equal to the percent reactance %IX, and is expressed by the following formula. %IZ+%IZafvβ2d
v %IZ; Percent impedance %IX between windings; Percent reactance β between windings; Leakage magnetic flux density V of each part of the winding and main gap; Volume of each part of the winding and main gap, that is, %IZ between windings is f 〆 Proportional to Dv.

In the case of the winding arrangement shown in Fig. 2a, the leakage flux distribution 6 at the center tap shown by the solid line is equal to both B and c, but the leakage flux distribution 7 at the highest tap shown by the broken line and the leakage flux distribution 7 at the lowest tap shown by the dashed line are the same. The leakage magnetic flux distribution 8 differs greatly between B and c.
This is due to the asymmetry of the winding arrangement when considering the high voltage tap winding 4, and this cause will not be resolved no matter which position the high voltage side tap winding 4 is placed as shown in Fig. 3. . Unless this cause is resolved, F6lZ between both high and low voltage windings can be matched at the central tab position, but not at other tab positions. In particular, there is a large difference in %IZ between the highest and lowest tap positions.
It is an object of the present invention to improve the placement and connection of tap windings in split transformers such as those described above, so as to improve the percent impedance between each split winding and the other windings as a function of the tap position. To obtain a transformer that can be made equal to each other without any problems, is easy to work with, and has no mechanical problems due to short circuits.

The present invention will be described below with reference to an embodiment shown in FIG. In FIG. 4, the same reference numerals as in FIG. 1 and FIG. 2 indicate the same parts, so the explanation thereof will be omitted.

In this embodiment, the high-voltage tap winding 4 is made separate from the high-voltage main winding 3 and is divided into two parts.The tap winding 4a, the low-voltage winding 1, the high-voltage The side winding 3, the low voltage side winding 2, and the high voltage side tap winding 4b are arranged concentrically.

In this case, a split tap winding 4a arranged on the inner diameter side of the high voltage side main winding 3 and a split tap winding 4b arranged on the outer diameter side are connected to a pair of terminals P1 and P2. Consisting of a plurality of unit windings having tabs as windings, these are wound alternately on the inner diameter side and the outer diameter side in the order from one pair of terminals P1 to the other terminal P2, and these plurality of unit windings are tapped. are connected in series via Further, the low-voltage side windings 1 and 2 and the high-voltage side main winding 3 have line terminals at their winding axial ends. Figure 4b shows the leakage flux distribution of the low voltage side winding 1, the high voltage side main winding 3, and the high voltage side tap windings 4a and 4b, and Figure 4c shows the low voltage side winding 2 and the high voltage side main winding. It shows the leakage magnetic flux distribution between the wire 3 and the high voltage side tap windings 4a and 4b.

As can be seen from these figures, in the case of the winding arrangement according to the present invention, the shapes of the leakage flux distributions 6, 7, and 8 are the same regardless of whether it is in the center, highest, or lowest tab. The %IZ between high and low voltage windings can be matched.

At intermediate tap positions, the leakage flux distribution is the same for every two taps9, and in the middle there is a slight difference, but the difference is extremely small and hardly a problem. In another embodiment shown in FIG. 5, the high voltage side tab windings 4a and 4b are connected between the low voltage side winding 1 and the high voltage side main winding 3 and between the low voltage side winding 2 and the high voltage side main winding 3. By placing it in between, the same effect as in the case of FIG. 4 can be obtained.

The same applies if the high voltage side is split winding and the low voltage side is taped.

[Brief explanation of drawings]

Fig. 1 is a wiring diagram showing a transformer winding having two circuits of sublit windings on the low voltage side, and Fig. 2 (a), B, and c are winding layout diagrams of a conventional transformer and its leakage flux distribution. Figure 3 is another winding layout diagram of the conventional transformer, Figure 4a is a winding layout diagram showing the transformer of the present invention, Figures 4B and c are leakage flux distribution diagrams, FIG. 5 is another winding arrangement diagram of the transformer of the present invention. 1, 2...Low voltage side winding, 3...High voltage side main winding, 4...High voltage side tap winding, 4a, 4
b... High voltage side tap winding, 5... Iron core leg, 6... Leakage magnetic flux distribution at center tap, 7...
...Leakage flux distribution at maximum tap, 8...
・Leakage magnetic flux distribution at the lowest tap.

Claims (1)

[Claims] 1 A high/low voltage main winding having a line terminal at the end in the axial direction of the winding, one winding consisting of two circuits used by connecting to two independent circuits, and the other winding consisting of one circuit. In a so-called split winding transformer having a tap winding, the tap winding is separated from the main winding and divided into two, and one split tap winding is arranged on the inner diameter side of the winding consisting of one circuit. A transformer characterized in that the wire and the other divided winding are arranged on the outer diameter side, and are connected in series through taps each having the inner diameter side and the outer diameter side divided winding. .