JPH05135985A - Ultrahigh pressure impregnating method for resin of transformers - Google Patents

Abstract

PURPOSE:To effectively impregnate a transformer body with resin even in the case of the resin having high viscosity, and to remove voids. CONSTITUTION:A transformer body 5 introduced into a vessel 3 and dipped in resin 6 is introduced into a pressure tank 1. The tank 1 is pressurized to an ultrahigh pressure to impregnate the body 5 with the resin. Prior to it, a vacuum impregnating method is employed and executed together with the above operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to resin impregnation of transformers, and more particularly to an ultra-high pressure compression impregnation method of impregnating a resin with ultra-high pressure.

[0002]

2. Description of the Related Art Transformers are impregnated with resin from the viewpoint of insulation resistance, moisture resistance and the like. Examples of means for this impregnation include a vacuum impregnation method and a low pressure impregnation method.

In the former vacuum impregnation method, as shown in FIG. 3, the inside of the vacuum / pressurization tank 1 is depressurized by using a vacuum pump 2 ', and a resin 6'is injected into the container 3 therein. This is a method of immersing the transformer main body 5 put therein in resin, and then returning to atmospheric pressure.

In the latter low pressure impregnation method, as shown in FIG. 4, a transformer main body 5 containing a container 3 is placed inside a pressurizing tank 1A, and a resin 6 is placed inside the container 5 from the outside. 3'by injecting ′ ′ and pressurizing the inside of the transformer through a pressurizing pump 2A ′ connected to the pressurizing bath 1A at a low pressure to forcibly infiltrate the resin 6 ′ into the transformer main body 5. A combined use with the impregnation method may also be performed.

[0005]

However, in the former vacuum impregnation method, the air in the transformer main body 5 can be discharged by vacuuming, but the permeation of the resin 6'becomes under atmospheric pressure. If the structure of the container body 5 is complicated, the resin 6'cannot be sufficiently permeated, and voids remain inside, which is not preferable in terms of insulation resistance. Further, in the latter low-pressure impregnation method, since the applied pressure is as low as several kg / cm ² to several tens of kg / cm ² , voids can be improved as compared with the vacuum impregnation method, but the viscosity is low. There is a problem that the resin permeability is poor because the low pressure is applied to a resin having a high viscosity that is less likely to be cracked than the resin 6 '.

The present invention has been proposed in view of the above, and an object thereof is to provide a resin for a transformer which can surely impregnate even a resin having a high viscosity and can remove voids. Another object of the present invention is to provide an ultra high pressure pressure impregnation method.

[0007]

According to the present invention, a transformer main body 5 placed in a container 3 and dipped in a resin 6 is placed in a pressure tank 1, and the inside of the pressure vessel 1 is superposed. Pressurize with high pressure,
The resin is permeated into the transformer main body 5 to achieve the above object.

The vacuum impregnation method is also used together to achieve the above object.

[0009]

The present invention can be used in the prior art by performing pressure impregnation using ultrahigh pressure in place of the vacuum impregnation method or the low pressure impregnation method that has been conventionally used for resin impregnation of transformers. Even if it is a resin with high viscosity that could not be made, it is possible to surely penetrate the resin,
Not only the simple structure, but also the complex structure having multiple windings of insulating papers and fine windings such as fine wires can be applied. Further, if the vacuum impregnation method is also used, the air can be first discharged by vacuuming and then super-pressurized, so that the voids can be surely removed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show manufacturing process diagrams of the present invention. First, in FIG. 1, 1 is a vacuum / pressurization tank to which a vacuum pump 2 is connected, 3 is a container placed in the vacuum / pressurization tank 1 via a table 4, and 5 is a container 3 The transformer main body 6 having a well-known configuration is a resin injected into the container 3. Further, in FIG. 2, the vacuum pump 2 in FIG. 1 is a pressurizing pump 2A.
It is said that. A heating heater 7 is provided around the vacuum / pressurization tank 1.

In the manufacturing process, however, as shown in FIG. 1, first, the transformer main body 5 is placed in the container 3 in advance, and the transformer main body 5 is placed in the vacuum / pressurization tank 1. In this state, in order to prevent the generation of voids, the inside of the tank is evacuated through the vacuum pump 2 to discharge the air inside.

Thereafter, as shown in FIG. 2, the transformer main body 5 contained in the container 3 is dipped in the resin 6, and the inside of the transformer is several hundred kg / cm ² to several thousand through the pressure pump 2A. kg /
The pressure is super-pressurized at a high pressure of cm ^2, and the applied pressure forces the resin 6 to penetrate into the transformer main body 5, and the heater 7 dries and solidifies it. Therefore, not only the resin 6 having a low viscosity, but also the resin 6 having a high viscosity such as an epoxy resin which is unlikely to cause cracks can surely penetrate the resin 6. In this case, the optimum impregnation can be performed by controlling the pressing force, the pressurizing speed, the pressurizing and holding time, etc. by the structure of the impregnating resin 6 and the transformer main body 5.

In the above embodiment, the combined use with the vacuum impregnation method was shown, but the vacuum impregnation method can be omitted and the resin 6 can be surely permeated into the transformer main body 5 even in the step shown in FIG. It is possible. Further, even if the air particles remain, the air particles are compressed by the super-pressurization, and the air particles are compressed by the applied pressure, so that voids are unlikely to occur. The present invention is preferably applied to a transformer main body or a high-voltage transformer having a complicated structure.

As described above, according to the present invention, several hundred kg / cm ² to several thousands kg are applied to the transformer main body immersed in the resin.
Since the pressure within the range of / cm ² is applied, the resin can be sufficiently permeated even with a complicated structure.

Further, a resin having a high viscosity can be used, and by controlling the pressing force, pressurizing speed, pressurizing and holding time, etc., the electrical and mechanical performance required for the transformer can be improved. The optimum resin can be selected.

Further, if used in combination with the vacuum impregnation method, voids can be surely removed.

[Brief description of drawings]

FIG. 1 is a manufacturing process diagram of the present invention.

[FIG. 2] Next process diagram of the above

FIG. 3 is a manufacturing process diagram of a conventional example.

FIG. 4 is a next process diagram of the same as above.

[Explanation of symbols]

 1 Vacuum / Pressure Tank 2 Vacuum Pump 2A Pressurization Pump 3 Container 4 Units 5 Transformer Main Body 6 Resin 7 Heater

Claims (2)

[Claims] 1. A transformer main body (5) placed in a container (3) and immersed in a resin (6) in a pressure tank (1).
And a pressure in the pressurizing tank (1) at an ultrahigh pressure to allow the resin to permeate into the transformer main body (5). 2. The ultra-high pressure compression impregnation method for a resin of a transformer according to claim 1, which is also combined with a vacuum impregnation method.