JPH0210563B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to an insulating support structure between a winding and an iron core of a stationary induction device such as a transformer or a reactor.

(Prior Art) FIG. 1 shows the insulating support structure of this type of conventional equipment. In the figure, 1 is a plurality of plate-shaped coils arranged side by side to form a winding, 2 is an electrostatic plate arranged in parallel on the outermost side of this plate-shaped coil 1, and 3 is attached below each plate-shaped coil 1. A solid spacer 5 supports each plate coil 1 through the insulating channel 3 provided in the insulating channel 4.
is an insulating barrier inserted between the spacers 4, 6
are insulating angles, and these 3 to 6 constitute an insulating and supporting member between the winding and the iron core 7.

In the equipment configured as described above, the equipotential line density between the winding and the iron core 7 is distributed in inverse proportion to the dielectric constant, so it generally becomes coarse in a solid insulator with a high dielectric constant. Parts of liquid or gas insulators with low dielectric constants become dense. On the other hand, since the electric field is proportional to the equipotential line density, in the conventional structure as described above, the insulation between the winding and the iron core 7, especially the spacer 4
The disadvantage is that the proportion of insulators with a high dielectric constant increases at the end of the spacer 4, and electric field concentration occurs in the small gap 4a with a low dielectric constant formed at the end of the spacer 4, as shown in detail in Fig. 2, and corona is likely to occur. Yes, also
Since the spacer 4 is solid, it also has the disadvantage that the weight of the device increases.

(Summary of the Invention) The present invention was made to eliminate the drawbacks of the above-mentioned conventional devices, and by forming a hollow spacer that insulates and supports the winding on the core, the spacer between the winding and the core is The object of the present invention is to provide a stationary induction device that can effectively reduce the amount of solid insulators, eliminate concentration of electric fields, prevent the generation of corona, and reduce the weight of the device.

(Embodiment of the Invention) Hereinafter, an insulation structure of a stationary induction device according to an embodiment of the present invention will be explained based on FIGS. 3 and 4. In the figure, a plate coil 1, an electrostatic plate 2,
The insulating channel 3, the insulating barrier 5, the insulating angle 6 and the iron core 7 are the same as those in the prior art shown in FIG. 1, so their explanation will be omitted. Reference numeral 8 denotes a spacer having a rectangular cross section, and each spacer is arranged to intersect with each other.

In one embodiment of the present invention configured as described above, the spacer 8 is formed in a rectangular cross section, that is, hollow, so that the insulating material with a high dielectric constant between the winding wire and the iron core 7 is reduced. As a result, the ratio of parts other than the solid insulator, such as liquid or gas, increases, and as a result, the equipotential lines in the part other than the solid insulator become rougher than in the past, making it difficult to relax the electric field. Moreover, the effect is particularly remarkable at the minute gap portion (corresponding to 4a in FIG. 1) at the end of the spacer 8 where the electric field is concentrated. Furthermore, since the spacers 8 are arranged in an intersecting manner, the probability that the solid insulating parts of the spacers 8 overlap each other is reduced, and the electric field relaxation effect is further doubled. In the above embodiment, the spacer 8 has a rectangular cross-sectional shape, but
It goes without saying that the structure is not limited to this, and the same effect can be achieved even if the structure is formed into various shapes as shown in FIG. 4, for example.

(Effects of the Invention) As described above, according to the present invention, by forming the spacer insulating and supporting the winding on the iron core into a hollow shape, the solid insulator between the winding and the iron core can be effectively reduced. It is possible to eliminate the concentration of electric fields, prevent the generation of corona, and reduce the weight of the equipment.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the insulation structure of a conventional stationary induction device, FIG. 2 is a partially enlarged sectional view showing the main part of the insulation structure in FIG. 1, and FIG. 3 is a stationary induction device according to an embodiment of the present invention. 4A, 4B and 4C are sectional views showing different embodiments of the spacer constituting the main part of the insulation structure in FIG. 3; FIGS. In the figure, 1 is a plate-shaped coil, 7 is an iron core, and 8 is a spacer. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A stationary induction device in which a winding consisting of a plurality of plate coils is insulated and supported on an iron core via a spacer, wherein the spacer is formed in a hollow shape. 2. The stationary guidance device according to claim 1, wherein the spacers are arranged to cross each other. 3. The stationary guidance device according to claim 1 or 2, wherein the spacer is formed in a cylindrical shape.