JPS62229916A - Transformer winding - Google Patents

Abstract

PURPOSE:To reduce the dimensions, loss and weight of a transformer by improving a static shielding unit provided at the end part of a spiral winding. CONSTITUTION:A static shielding unit 2 provided at the end part of a spiral transformer winding 1 which is constituted by large number of rectangular conductors 3 arranged in parallel in such a manner that the outermost conductor 3a of the axial direction is wound in the horizontal direction and folded toward the transformer winding 1 side af the lead wire part 4 of the winding 1 and the folded innermost conductor 3b of the axial direction is wound with the same inclination as the spiral winding 1 and then insulation is applied over the whole circumference. The one side ends of the parallel-arranged conductors of the static shielding unit 2 are commonly connected and unified and the other side ends maintain insulation between the respective insulated conductors 3 and one 3C of them is connected to the lead part 4 of the winding. With this constitution, the position relation between the static shielding unit 2 and the end of the facing winding can be maintained wherever the static shielding unit 2 is provided along tlle circumferential direction so that the inshlating dimension (D) between the windings can be minimum required dimension.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a transformer winding in which an electrostatic shield is provided at the end of the winding to reduce electric field strength.

(Prior Art) An electrostatic shield is disposed at the end of a winding of a high voltage transformer for the purpose of alleviating electric field strength. This electrostatic shield is made by covering the outer periphery of a conductor with the same dimensions as the inner and outer diameters of the ends of the first winding IiA with a necessary insulating layer, and electrically connecting the conductor to the conductor of the winding. potential is given.

The conductor of the electrostatic shield of a small-capacity transformer may be a solid solid piece, but as the conductor of the electrostatic shield of a large-capacity transformer, leakage magnetic flux existing at the ends of the winding causes the conductor to Integral solid conductors are not used because current losses occur within the circuit.

For this reason, various diversions have been made, one of which is one in which the conductor of the electrostatic shield is made up of a bundle of many thin insulated rectangular conductors.

In this case, the electrostatic shield is constructed by using a conductor arranged in parallel with a large number of rectangular insulated conductors, and the outer periphery of the parallel arranged conductor is covered with an insulating material. The rectangular conductors are connected in common so that they do not fall apart, and their ends are connected to the outlet ends of the windings, and the other ends of the parallel conductors are integrally coated with insulation. The potential of this electrostatic shield is applied to all MM conductors at a common connection through an insulated conductor connected to the exit end of the winding. In this way, it is possible to prevent a ring current from flowing between the parallel cores due to leakage magnetic flux existing in the portion where the electrostatic shield is located.

(Problem to be Solved by the Invention) However, if this electrostatic shield body is wound with a certain inclination to the horizontal axis in the transformer winding and is arranged in a spiral winding, the electrostatic shield body also becomes a problem in the transformer winding. The wire is wound with the same inclination as the wire, and the winding end (or electrostatic shield) of the opposing winding is shifted in level, resulting in a positional relationship as shown in FIG. 3(a).

Figure 3 shows the positional relationship between the two opposing windings W, W,
This is a diagram to show that the electric field strength E at the coil end point P is different, and in FIG. 3 (aHb), two windings W□, W
The electric field strength E at one point P when the shape of the ends of 2, the distance d between the coils, and the potential difference V are the same.

Give E' in each case. Here, f and f' are constants determined by the arrangement of the two windings, and it is well known that in the case of FIG. 3, f>f'.

Therefore, in the conventional electrostatic shield body, the arrangement is as shown in Fig. 3(a), and the electric field strength E at the end of one winding becomes large, so it is necessary to increase the inter-winding pressure f11d, and the winding The diameter of the transformer increases.

There was a drawback that loss 9 weight etc. increased.

An object of the present invention is to improve the size by improving the electrostatic shield disposed at the end of the helical winding.

The object of the present invention is to provide a transformer winding that can reduce losses and weight.

[Structure of the invention]

(Means and effects for solving the problem) The transformer winding according to the present invention has a helical winding that is wound at a certain inclination with respect to the horizontal axis, and an electric field relaxation device arranged at the end of the helical winding. The electrostatic shield is composed of parallel conductors, and the outermost conductor in the axial direction of the parallel conductors is wound horizontally, and the spiral winding The innermost conductor in the axial direction is folded back at the protruding portion, and the folded innermost conductor in the axial direction is wound with the same or similar inclination as the spiral winding, and each conductor of the parallel conductors is arranged in common at any one point. It is characterized by connecting one of the parallel conductors to the spiral winding, increasing the shielding effect at the end of the winding, and reducing the size, loss and weight of the transformer winding. can be reduced.

(Example) The present invention will be described below with reference to FIGS. 1 and 2. That is, as shown in FIG. 1, as the electrostatic shield 2 installed at the end of the spiral transformer winding 1, a conductor arranged in parallel with a large number of rectangular insulated conductors 3 shown in FIG. 2 is used. , the axially outermost conductor 3a is wound horizontally and is folded back toward the winding 1 at the sunrise portion 4 of the transformer winding 1, and the axially innermost conductor 3b that has been folded back After winding with the same or similar inclination as spiral winding 1,
It is constructed by covering its surroundings with an insulating material.

One end of the parallelly arranged conductors of this electrostatic shield body 2 is all commonly connected and integrated, and the other end is connected to each insulated conductor 3.
One of them 3c is used by connecting it to the protruding part 4 of the winding.

With this configuration, the position of the electrostatic shielding body 2 at the end of the winding of the helical winding 1 is at the position shown in FIG. 2(b) with the opposite end of the winding at any position in the circumferential direction. It becomes possible to establish a relationship. Therefore, the insulation dimension d between the windings can be made the minimum necessary dimension, the diameter of the outer winding can be reduced, and the transformer can be made smaller, with lower loss, and with a reduced weight.

In the embodiment of the present invention, rectangular copper bodies were used as the parallel conductors, but round wires may be used if mechanical strength is not required.

〔Effect of the invention〕

As described above, the electrostatic shielding body of the spiral winding according to the present invention has the same height level with the opposing winding at any position in the circumferential direction, so that the electrostatic shielding effect is maximized. You can get transformer windings available.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the electrostatic shield portion of a transformer winding according to the present invention, FIG. Figures 3a and 3b are schematic diagrams for explaining the relationship between the positions of two opposing windings and the electric field strength at the end of the coil. 1... Spiral winding 2... Electrostatic shield body 3.
...Parallel arranged conductor 3a...Axially outermost conductor 3b
...Axial outermost conductor 4...Exit part 5...Insulator agent Patent attorney Yoshiaki Inomata (and one other person) Figure 2

Claims (1)

[Claims] (1) It consists of a combination of a helical winding that is wound at a certain inclination to the horizontal axis and an electrostatic shield for mitigating the electric field placed at the end of the coil, and the electrostatic shields are arranged in parallel. The outermost conductor in the axial direction of the parallelly arranged conductors is wound in the horizontal direction, and is folded back at the exit portion of the spiral winding, and the innermost conductor in the axial direction that has been folded back is It is constructed by winding with the same or similar inclination as the helical winding, and the conductors of the parallel arranged conductors are commonly connected at any one point, and one of the parallel arranged conductors is connected to the spiral winding. A transformer winding characterized in that it is connected to.