JPS5923389Y2 - transformer winding - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a transformer winding in which the electric field at the end of the winding is relaxed.

Generally, when a spirally wound wire is wound on an iron core adjacent to a high voltage winding, an electrostatic shield is provided at the end of the winding to alleviate the electric field at the end of the winding. There is.

Electrostatic shields are usually made by wrapping aluminum foil around a round insulating core, and then applying insulation on top of that.

Then, a potential wire is drawn out from the aluminum foil and connected to the winding outlet, so that the electrostatic shield and the winding outlet are at the same potential.

By the way, in such a spiral winding, FIGS. 1 and 2
As shown in the figure, the electrostatic shield 1 is placed at the end of the winding 2 and is fastened together with the winding 2, so the surface facing the end of the winding 2 has a shape that matches the end face of the winding 2. configured.

Therefore, the electrostatic shield 1 is constructed with an inclination such that the portion facing the winding lead portion 2a is recessed the most.

However, since the electrostatic shield 1 is constructed by wrapping aluminum foil around an insulating core as described above, it is not possible to form a steep slope on the surface facing the winding.

Therefore, the opening 2 between the electrostatic shield 1 and the end of the winding 2
A triangular gap 3 is formed near a.

Particularly in large-capacity containers, it is necessary to wind the spiral winding in two or more rows as shown in FIGS. 3 and 4, and in this case, the triangular gap becomes even larger.

Therefore, the electric field mitigation effect of the electrostatic shield on the adjacent high voltage winding 4 is reduced, and there is a drawback that the distance between the high voltage winding 4 and the high voltage winding 4 must be increased.

This invention was made to eliminate the above-mentioned drawbacks.
It is an object of the present invention to provide a transformer winding in which the electric field mitigation effect of an electrostatic shield does not deteriorate.

An embodiment of the present invention is shown in FIGS. 5 and 6, and its structure will be explained below.

An electrostatic shield 1 having a surface configured to match the winding inclination of the winding is placed at the end of a spirally wound winding 2, and a potential wire 1a drawn out from aluminum foil constituting the electrostatic silt 1.
and the lead part 2a of the winding 2 are connected to have the same potential.

An auxiliary electrostatic shield 5 is placed in a triangular gap 3 formed near the opening 2a between the electrostatic shield 1 and the winding 2.
Place.

Similarly to the main electrostatic shield 1, the auxiliary electrostatic shield 5 also has a potential wire 5a drawn out and connected to the winding lead 2a to have the same potential.

With this configuration, the shape of the electric field at the end of the spiral winding can be made good, so the insulation dimension between the adjacent high voltage winding 4 can be reduced, and the device can be made smaller.

Further, since the auxiliary electrostatic shield 5 has a simple shape, it is easy to manufacture.

[Brief explanation of the drawing]

Figures 1 and 2 are a front view and side sectional view of a typical spiral transformer winding, Figure 3 is a front view of a typical double-row spiral transformer winding, and Figure 4 is an adjacent FIG. 3 is a side sectional view showing a high voltage winding, and FIGS. 5 and 6 are a plan view and a side sectional view showing an embodiment of the present invention. 1... Electrostatic shield, 1a... Electrostatic shield potential wire, 2... Winding wire, 2a...
・Output portion, 3...Gap, 4...Adjacent high voltage winding, 5...Auxiliary electrostatic shield, 5
a... Potential line of auxiliary electrostatic shield.

Claims (1)

[Scope of utility model registration request] In a transformer winding having an electrostatic shield at the end of the spirally wound winding that is at the same potential as the opening of the winding, the opening between the end of the winding and the electrostatic shield. A transformer winding characterized in that an auxiliary electrostatic shield having the same potential as the lead part is provided near the lead part.