JPH06267762A - Disc winding of transformer - Google Patents

Abstract

PURPOSE:To relax a differential voltage when an impulse voltage penetrates and to improve impulse voltage characteristic in a part of large differential voltage between interleave coils. CONSTITUTION:The transformer disc winding is formed by winding a shield conductor S by at least one turn in a part of large differential voltage between electric wires near the side of a winding inner diameter between interleave coils I, II. Therefore, impulse voltage characteristic during penetration of impulse voltage is improved by electrostatic capacity between shield conductors.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer disk winding,
In particular, the present invention relates to a transformer that is suitable for a device whose impact voltage characteristics are deteriorated when an impact voltage enters.

[0002]

2. Description of the Related Art A winding of this type is described in Japanese Patent Application Laid-Open No. 52-131119, which discloses a disk winding having improved shock voltage characteristics. In general, interleaved windings reduce the number of turns per coil and increase the insulation thickness of each winding when it becomes a transformer of ultra-high voltage and large capacity. Capacity decreases,
The shock voltage characteristics deteriorate. In order to deal with this, in the known example, two turns on the outside of the coil and two turns of a coil separated from each other are electrostatically coupled to each other, and an impact voltage flowing between adjacent electric wires in the coil or between the electric wire and the shield conductor is used. A large series capacitance is added between the coils by reversing the directions of the charging currents and canceling the inductance between them.

[0003]

In the above case, the shock voltage characteristics of the entire winding are improved, but the part where the difference in the number of turns between the pair of interleaved coils is large, that is, the part where the difference voltage is large is considered. However, when a shock voltage such as a lightning surge enters, the difference voltage increases and the shock voltage characteristic deteriorates.

An object of the present invention is to alleviate a difference voltage when a shock voltage intrudes in a winding having a large difference voltage between a pair of interleaved coils and to improve shock voltage characteristics.

[0005]

DISCLOSURE OF THE INVENTION A transformer disc winding characterized in that a shield conductor is wound around at least one turn in a portion where a voltage difference between electric wires is large near an inner diameter side between a pair of interleaved coils.

[0006]

[Function] The electrostatic capacitance between the shield conductor and the electric wire and between the shield conductors alleviates the differential voltage when an impact voltage invades.

[0007]

EXAMPLE FIG. 2 is an internal structure diagram of a transformer. Tank 1
There is an iron core 107 in 06, and the winding 10 is attached to the iron core 107.
8 is wound. The winding 108 is arranged as shown in the sectional view of FIG. The low-voltage winding 109 is arranged on the inner side and the high-voltage winding 110 is arranged on the outer side, and is wound in the radial direction around the iron core 107. FIG. 1 is an enlarged view of the high voltage winding 110 in detail. U is a terminal point. Insulation cylinder 10
A high-voltage winding 110 is wound around 2. The number in the disc coil indicates the number of turns (turns) of the electric wire. The load current flows in this order of numbers. The electric wire winds the disc coil 110A, moves to the adjacent disc coil 110B at the inner transition portion 103, winds the disc coil 110B, and then the outer transition portion 1
05, the coil coil 110A is moved to the disk coil 110A and wound so as to be wound, and then the disk coil 110B is moved and wound to be wound by the inner transition portion 104 to form a pair of interleaved coils I. The interleaved coils are arranged in a plurality of stages. A portion having a large difference voltage between the pair of interleaved coils I and a pair of adjacent interleaved coils II, that is, the difference voltage between the wire number 8 of the disk coil 110B and the wire number 41 of the disk coil 110C is reduced. Therefore, the end of the shield conductor S is wound in the middle of winding the electric wire of the disk coil 110C from the inner side to the outer side, and the other end of the shield conductor S is connected to the disk coil 110B.
The electric wire is inserted from the outside to the inside so that it can be wound. Thereby, the differential voltage is reduced and the shock voltage characteristic is improved.

FIGS. 4 to 6 show another embodiment.
Shows a structure in which a shield conductor is wound inside by one wire from the embodiment of FIG. 1, and the other structures are the same.

FIG. 5 shows a structure in which the position of the shield conductor is the same as that of the embodiment of FIG. 1, but the connection method is different.
Is a structure in which the shield conductor is wound inside by one wire from the embodiment of FIG. 1 by the same connection method as in FIG.

The effects are the same as those of the embodiment shown in FIG. 1, but FIGS. 1 and 5 are shown in FIGS.
Considers maximum differential voltage relaxation.

[0011]

According to the present invention, the capacitance between the shield conductor and the wire and between the shield conductor and the shield conductor, which are wound around a portion of the inner wire between the pair of interleaved coils, where the voltage difference between the wires is large, is obtained. Improving the impact voltage characteristics when the impact voltage intrudes.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a winding that is an embodiment of the present invention.

FIG. 2 is a sectional view of a transformer.

FIG. 3 is a layout diagram of windings inside a transformer.

FIG. 4 is a sectional view of a winding showing another embodiment.

FIG. 5 is a cross-sectional view of a winding showing another embodiment.

FIG. 6 is a cross-sectional view of a winding showing another embodiment.

[Explanation of symbols]

I, II ... A pair of interleaved coil units, 1, ...
8 ... Electric wire number, 102 ... Insulation cylinder, 103, 104, 10
5 ... Crossover and connection line, 110A, 110B, 110C,
110D ... Disc coil, U ... Application terminal, S ... Shield conductor.

Claims (1)

[Claims] 1. A pair of disc windings in which a plurality of electric wires are wound in parallel in two circuits. A pair of disc coils formed by continuously winding only one electric wire to provide a predetermined potential difference between the windings. This is a winding in which a pair of interleaved coils formed by sandwiching and winding the winding by the other electric wire which separates the winding of the coil is stacked, and the series capacitance between the disk coils is gradually reduced. In the winding having the following structure, at least one turn of the shield conductor is wound around a portion of the wire between the pair of interleaved coils near the inner diameter of the winding where the voltage difference between the wires is large, .