JPH041487B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to interleaved windings used in transformers, reactors, and the like.

[Technical background of the invention and its problems] Windings of stationary induction electric appliances such as transformers and reactors improve the potential oscillation of the windings when impulse voltages such as lightning surges and switching surges enter the windings. To this end, various efforts have been made, one of which is often employing interleaved disc windings in which the series capacitance of the windings is increased. Furthermore, interleaved windings are suitable for constructing tap windings because their winding structure makes it easier to pull out the leads from the outside of the windings compared to ordinary disc windings.

The structure of the interleaved winding is as shown in FIG.
Conductor No. 6 and three conductors No. 17 to 24 are wound in parallel to make a twin disc coil consisting of upper and lower sections W ₁ and W ₂ . and 21 are connected, and 8 and 9 and 16 and 17 at the end of the outer winding are connected, and the whole is connected in series. The series capacitance between adjacent conductors such as conductors 1 and 9, 16 and 24 becomes significantly large, and the potential distribution against surges is extremely good. In addition, Figure 1 shows the connection between the upper and lower sections at 3 points on the inside cross section and 2 points on the outside cross section.
Although a rotating interleaved winding is shown, the same applies to a two-turn type in which the sections are connected at two points on the inner side and at one place on the outer side.

In forming the three-turn interleaved disk winding shown in FIG. 1, the insulation thickness of the conductor is set to a thickness that can withstand the maximum voltage generated between adjacent rectangular conductors. That is, in the 3-turn interleaved disk winding with 12 turns per section shown in FIG. 1, there are 8
Although the voltage corresponding to the number of turns is applied, the voltage corresponding to 15 turns is applied between the conductors 17 and 2, which is approximately twice the voltage of the former. For this reason, the conductor should be insulated with paper-wrapped insulator T ₁ to a thickness that can withstand the voltage of 15 turns for all conductors of the 3-turn interleaved winding, as shown in Figure 2. is used. Therefore, for example, in a portion such as conductors 1 and 9 in FIG. 2, where only the voltage for eight turns is applied, excessive insulation occurs and the conductor space factor deteriorates.

[Object of the Invention] An object of the present invention is to provide an interleaved winding in which the conductor space factor is improved by using insulated conductors in coordination with the voltage between the conductors.

[Summary of the Invention] The interleaved winding according to the present invention is a twin disc coil formed by winding a plurality of conductors in parallel, overlapping each other in parallel.
The first conductor withstands the voltage applied between adjacent conductors.
The outer side of the composite wire made of a plurality of conductors in parallel is insulated with a second insulator that cooperates with the first insulator and withstands the voltage applied between the composite wires. It is something to do.

[Embodiments of the Invention] The present invention will be described below with reference to embodiments shown in FIGS. 3 and 4. This embodiment also shows a three-turn interleaved winding. That is, conductor 1
~8, conductors 9~16, and conductors 17~24 are wound in parallel to form upper and lower sections W1, W.
2, conductors 4 and 5 at the end of the inner winding, conductors 12 and 13, and conductors 20 and 2.
1 is connected, and conductors 8 and 9 at the end of the outer winding and conductors 16 and 17 are connected to make the whole in series. Actually, this interleaved winding is inserted into the insulating tube 30 as shown in the figure to complete the winding assembly.

Now, if we analyze the voltage relationship between each conductor in Fig. 3, we can see that in the upper section, conductors 1 and 9, 9 and 17, 2 and 10, 10 and 18, 3 and 1
Voltage for 8 turns is applied between conductors 1, 11 and 19, 4 and 12, and 12 and 20, and voltage for 15 turns is applied between conductors 17 and 2, 18 and 3, and 19 and 4. .
Also in the lower section, conductors 24 and 7, 23
17 turns of voltage will be applied between 6, 22 and 5, and 8 turns of voltage will be applied between each of the remaining conductors.

Therefore, when setting the insulation of each conductor,
As shown in Figure 4, each conductor strand is insulated with an insulator _T2 that has the strength to withstand the voltage of 8 turns.
Composite wire made by stacking three conductors 1, 9, and 17 side by side
Insulator T ₈ is further wrapped around the outside of W ₀ for insulation. The insulator T ₃ has a total insulation strength with the insulator T ₂ of the wire to withstand the voltage of 17 turns. In this way, a composite wire of conductors 1, 9, and 17 forming a 3-turn interleaved disk winding
Of W ₀ , the strength of the insulator T ₂ of the conductor element wire and the composite wire
By setting the strength of the insulator T ₃ of W ₀ and determining the insulation thickness and insulation material that match this strength, a coordinated insulation structure can be created, and the entire conductor can be covered without unnecessary insulation. It is possible to obtain an interleaved disk winding with an improved space factor.

In the embodiment shown in FIG. 3, the connections at the winding ends of the upper section conductor and the lower section conductor are made as follows: conductors 4 and 5, 12 and 13, 20 and 21,
The case is shown in which it is applied to a 3-turn interleaved disk winding performed in straight lines of 8 and 9 and 16 and 17, but as shown in FIG. An insulation configuration can also be implemented for interleaved disc windings based on similar insulation coordination considerations. Further, a similar insulation configuration can be applied to a two-turn interleaved disk winding in which two conductors are wound in parallel to form a twin disk coil.

[Effects of the Invention] As described above, according to the present invention, the insulation of the conductor strands is made strong enough to withstand the voltage applied between adjacent conductors, and the insulation of the composite wire made by winding a plurality of conductor strands side by side is made into a composite wire. By insulating the conductors to a strength that can withstand the voltage applied between them, sufficient insulation strength is ensured between the conductors, and an insulation structure with efficient insulation coordination is obtained, resulting in a high conductor space factor without wasting any insulation. An improved interleaved winding can be obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conductor showing an interleaved winding, FIG. 2 is an enlarged cross-sectional view showing the insulation structure of the conductor, FIG. The figure is an enlarged sectional view of a composite wire to which the insulation structure according to the present invention is applied. 1 to 24... Conductor (turn number), 30... Insulating tube, W ₁ ... Upper section, W ₂ ... Lower section, W ₀ ... Composite wire, T ₁ ... Insulator, T ₂ ... First insulator, T ₃ ...second insulator.

Claims (1)

[Claims] 1. A twin disc coil consisting of an upper and lower section is made by winding multiple conductors in parallel, and the conductor strands are insulated with a first insulator that can withstand the voltage between adjacent conductors. An interleaved winding characterized in that the outside of a composite wire made up of a plurality of parallel conductors is insulated with a second insulator that cooperates with the first insulator and withstands the voltage applied between the composite wires.