JP3343945B2 - Transformer winding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding of a core-type three-winding transformer having two secondary windings.

[0002]

2. Description of the Related Art Conventionally, as windings of a core-type three-winding transformer having two secondary windings, secondary windings of two circuits are arranged above and below a concentric circle, and primary windings are formed. Are generally adopted in a split winding system in which are disposed above and below a concentric circle and connected in parallel.

FIG. 4 is a winding arrangement diagram showing the configuration of a conventional split winding, in which secondary windings 12 and 13 are vertically arranged on the outer periphery of an iron core leg 11, and the outer periphery of the secondary windings 12 and 13 is shown. The primary main windings 14 and 15 are vertically arranged, and the primary tap windings 16 and 17 are vertically disposed outside the primary main windings 14 and 15. Then, the lower lead of the primary tap winding 16 and the primary tap winding 17
Are connected to each other and are drawn out as one terminal 19 of the primary winding 18. The upper lead of the primary tap winding 16 and the lower lead of the primary main winding 14 are connected, and the lower lead of the primary tap winding 17 and the primary main winding 1 are connected.
5, the upper lead of the primary main winding 14 and the lower lead of the primary main winding 15 are connected, and are drawn out as the other terminal 20 of the primary winding 18. As described above, the primary winding 18 has two circuits connected in parallel.

FIG. 5 is a layout diagram showing the relationship between the winding impedances of the conventional split winding. In FIG. 5, the impedance between the primary winding P and the secondary winding S (A) is represented by% I.
_{ZPS (A)} , the impedance between the primary winding P and the secondary winding S (B) is% IZPS _(B) , and the impedance between the secondary winding S (A) and the secondary winding S (B). Is given as% IZS _{(A) -S (B)} ,% IZPS _(A) =% IZPS _(B) ,% IZS _{(A) -S (B)} = 2 ×% IZPS _{( A)} = 2 ×% IZ _{PS (B)} , the primary separation impedance is zero when three windings are separated, and the secondary side is not affected by the mutual load fluctuation.
A low impedance transformer winding cannot be realized.

FIG. 6 shows an equivalent circuit of a conventional split winding. In FIG. 6, the impedance between the primary winding P and the secondary winding S (A) is represented by% IZ _{PS (A)} , The impedance between the secondary winding S (B) is% IZ _{PS (B)} , and the impedance between the secondary winding S (A) and the secondary winding S (B) is% IZ _{S (A) -S} and _{(B),% IZ = (} % IZ PS (a) +% IZ PS (B) +% IZ S (a) -S (B)) / 2 and if the primary separation impedance% IZ _P in% the _{IZ P =% IZ-% IZ S} (a) -S (B).

[0006]

FIG. 7 is a winding arrangement diagram showing a winding arrangement of a conventional core-type transformer. In FIG.
Is a primary winding, S is a secondary winding, K = constant, A × T = (current) × (number of turns), e is an induced voltage per turn,
Um = average circumference of primary winding and P secondary winding S, H = height of winding, d ₀ = dimension between primary winding P and secondary winding S, d ₁
= Primary winding winding width of P, d ₂ = the secondary winding winding width S, the dimension between d ₀ = primary winding P and a secondary winding S, and when the impedance of the inner iron transformer % IX _PS is

[0007]

(Equation 1)

## EQU1 ##

As described above, in the case of the conventional split winding, H is small and d ₁ and d ₂ are large, which is advantageous in the case of a high impedance transformer, but is difficult to apply to a low impedance transformer. Therefore, a low impedance transformer winding cannot be realized.

FIG. 8 is a magnetic flux diagram showing the amount of leakage magnetic flux of a conventional transformer winding. The horizontal axis represents the position in the winding radial direction, and the vertical axis represents the amount of leakage magnetic flux. The solid line shows the leakage flux when the primary voltage is at the rated voltage, the dotted line shows the leakage flux when the primary voltage is at the highest tap voltage, and the dashed line shows the leakage flux when the primary voltage is at the lowest tap voltage. ing.

The line above the horizontal axis represents the relationship between the secondary winding S (A) and the primary winding P, and the line below the horizontal axis is the secondary winding S (A).
3B shows the relationship between the primary winding P.

Since the primary tap winding is disposed outside the primary winding, the amount of impedance change due to a tap change when the primary tap is switched is large.

FIG. 9 is an impedance state diagram showing a change in impedance when the primary tap of the conventional transformer winding is changed. The horizontal axis shows the state of the change in the primary tap, and the vertical axis shows the magnitude of the impedance. Represents.

If the total amount of magnetic flux in the iron core is Φ _C and the total amount of leakage magnetic flux is Φ,% IZ =% IX = Φ / Φ _C × 100
(%), As shown by the solid line, the impedance between the primary winding P and the inner secondary winding S (A) and the primary winding P
And the inner secondary winding S (B) have the same impedance. As described above, there is a problem that the amount of impedance change due to a tap change when the primary tap is switched is large.

The present invention has been made in view of the above points. The impedance between the primary winding and the two secondary windings is almost the same, the impedance can be reduced, and the impedance due to the change in the primary tap can be reduced. An object of the present invention is to provide a transformer winding having a small change amount and capable of reducing the primary separation impedance to zero.

[0016]

The transformer winding according to the present invention comprises an inner secondary winding, an inner primary main winding, a primary tap winding, an outer primary main winding, and an outer secondary winding on the outside of the iron core leg. Wires are wound in the order of the wires , and one end of the primary tap winding is connected to a lead terminal.
And the other end of the primary tap winding is connected to the inner primary main winding.
And the other end of this inner primary winding is connected in series.
A primary winding is formed by connecting in series to one end of the outer primary main winding , and the inner secondary winding and the outer secondary winding are formed as independent circuits.

[0017]

With the above configuration, the impedance between the primary winding and the two secondary windings is almost the same, the impedance can be reduced, the amount of impedance change due to the primary tap change is small, and The primary separation impedance can be made zero.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a transformer winding according to the present invention will be described below with reference to the drawings. FIG. 1 is a winding arrangement diagram showing an embodiment of a transformer winding according to the present invention. In FIG. 1, an inner secondary winding 2, an inner primary main winding 3, and a primary tap winding 4 are provided outside a core leg 1. , The outer primary main winding 5 and the outer secondary winding 6 are wound in this order, and the lower side of the primary tap winding 4 is used as one terminal 8 of the primary winding 7, and the upper side of the primary tap winding 4 And the upper side of the inner primary main winding 3, then the lower side of the inner primary main winding 3 and the lower side of the outer primary main winding 5, and the outer primary main winding 5
Is the other terminal 9 of the primary winding 7. As described above, the primary winding 7 is configured by connecting the primary tap winding 4, the inner primary main winding 3, and the outer primary main winding 5 in series.

On the other hand, the inner secondary winding 2 and the outer secondary winding 6 are secondary windings of independent circuits.

FIG. 2 is a magnetic flux diagram showing the amount of leakage magnetic flux of the embodiment of the transformer winding of the present invention. The horizontal axis represents the position in the winding radial direction, and the vertical axis represents the amount of leakage magnetic flux. The solid line shows the leakage flux when the primary voltage is at the rated voltage, the dotted line shows the leakage flux when the primary voltage is at the highest tap voltage, and the dashed line shows the leakage flux when the primary voltage is at the lowest tap voltage. ing.

FIG. 3 is an impedance state diagram showing a change in impedance when the primary tap is changed in the embodiment of the transformer winding of the present invention. The horizontal axis represents the state of the change in the primary tap, and the vertical axis represents the impedance. Represents the size of. The solid line shows the impedance between the primary winding and the inner secondary winding, and the dotted line shows the impedance between the primary winding and the outer secondary winding.

By adjusting the winding shape (height and winding thickness) and the dimension between the windings,% IZ _{S (A) -S (B)} and 2 ×% I
It is possible to make Z _{PS (A)} and 2 ×% IZ _{PS (B)} substantially equal, so that the primary separation impedance can be made zero or almost zero.

[0023]

As described above, (1) the impedance between the primary winding and the two secondary windings is almost the same, and the impedance can be reduced.

(2) The change in impedance due to the change in tap of the primary winding is extremely small.

(3) The primary separation impedance can be made zero by appropriately selecting the winding shape and the dimension between the windings.

Such excellent effects as described above can be obtained.

[Brief description of the drawings]

FIG. 1 is a winding arrangement diagram showing an embodiment of a transformer winding of the present invention.

FIG. 2 is a magnetic flux state diagram showing the amount of leakage magnetic flux of the embodiment of the transformer winding of the present invention.

FIG. 3 is an impedance state diagram showing a change in impedance when a primary tap is changed in the embodiment of the transformer winding of the present invention.

FIG. 4 is a winding arrangement diagram showing a winding structure of a conventional transformer winding.

FIG. 5 is a magnetic flux state diagram showing the amount of leakage magnetic flux of a conventional transformer winding.

FIG. 6 is an impedance state diagram showing a change in impedance when a primary tap of a conventional transformer winding is changed.

FIG. 7 is a winding arrangement diagram showing a winding arrangement of a conventional core-type transformer.

FIG. 8 is a magnetic flux state diagram showing the amount of leakage magnetic flux of a conventional transformer winding.

FIG. 9 is an impedance state diagram showing a change in impedance when a primary tap of a conventional transformer winding is changed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Iron leg 2 ... Inner secondary winding 3 ... Inner primary main winding 4 ... Primary tap winding 5 ... Outer primary main winding 6 ... Outer secondary winding 7 ... Primary winding 8, 9 ... Primary winding Terminal

Claims (1)

(57) [Claims] 1. A core-type transformer having two secondary windings, wherein an inner secondary winding, an inner primary main winding, a primary tap winding, an outer primary main winding, and an outer winding are provided outside the iron core legs. It is wound and arranged in the order of the secondary winding , and one end of the primary tap winding is
Terminal, and connect the other end of this primary tap winding to the inner primary
Connected in series to one end of the main winding, and
The other end is connected in series to one end of the outer primary main winding to form a primary winding, and the inner secondary winding and the outer secondary winding are each configured as an independent circuit. Vessel winding.