JPH06333454A - Manufacture of filling type insulating material - Google Patents

Abstract

PURPOSE:To obtain a filling type insulating material having a high reliability, which can withstand against a high field intensity by diffusing the high insulating gas in the thermosetting insulating raw material for impregnation before filling this insulating material in a filling type shape, and displacing the all air molecules inside of the raw material with gas. CONSTITUTION:A filling type shape 3 housed inside of a filling type tank 1 and a mixture tank 2 are connected through a flow passage 4. At the time of manufacturing the filling type insulating material, epoxy resin or the like and the hardening material for manufacturing the thermosetting insulating raw material are thrown into the mixture tank 2, and the tank 2 is sealed, and the material inside of the tank 2 is agitated by an agitating means 2a, and heated by a heating device 7 to form the thermosetting insulating raw material. Simultaneously, the air inside of the mixture tank 2 is deaerated by a vacuum pump 5, and thereafter, displaced with the high insulating gas having a high insulating intensity. Next, this insulating raw material is filled in the filling type shape 3 housed in the filling type tank l maintained under the vacuum condition, and heated by the heating device 7 to harden the insulating raw material and obtain the filling type insulating material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an insulator mainly used for high voltage power equipment.

[0002]

2. Description of the Related Art As a conventional method for producing a cast insulator used in a high-voltage power equipment, a general insulating material is in an atmospheric pressure state or vacuum degassed and then poured into a casting mold. It is manufactured by a casting method that cures and cures.

[0003]

Since the cast insulating material used in the conventional high-voltage power equipment is manufactured by the above manufacturing method, the resin, the curing material, the auxiliary material, etc. are injected before the injection. In the manufacturing process to mix and mix these into a uniform insulating material, it is unavoidable that a large amount of air is mixed in with the insulating material being a highly viscous fluid. The difference in size remained as air bubbles, leading to deterioration of insulation characteristics.

The present invention has been made to solve the above-mentioned problems, and in the case where bubbles are mixed or generated in the insulating material in the process of manufacturing the insulating material before being poured into the casting mold. However, SF with high insulation strength is present in the bubbles.
By encapsulating a gas with excellent insulation characteristics such as No. 6, it has sufficient insulation strength to withstand the electric field used up to now, and even when used as a higher electric field, the internal corona It is an object of the present invention to provide a manufacturing method in which the deterioration of insulation is prevented and the long-life insulating member is easily obtained without the occurrence of such problems.

[0005]

The method for producing a cast insulator according to the present invention is a process for producing an insulating material before being poured into a casting mold, that is, air bubbles are most mixed or generated in the insulating material. Even when bubbles are generated, the agitation generation process in the mixing tank is performed in an atmosphere in which the inside of the mixing tank is degassed in vacuum and gas is replaced with SF6 having high insulation strength. In addition, a gas having excellent insulation characteristics such as SF6 having high insulation strength is filled.

Further, in the method for producing a casting insulator according to the present invention, after the inside of the casting tank holding the casting shape is vacuum-treated,
By filling the insulating material with high insulating gas such as SF ₆ and injecting the insulating material in a state where the air in the tank is almost completely replaced by the highly insulating gas, all the impurities generated in the insulating material during the injection process are generated. Highly insulating gas is contained in the bubbles.

[0007]

In the present invention, the high insulating gas having excellent insulation performance is contained in all the bubbles mixed and generated in the insulating material, and therefore, the insulating strength of the conventional bubble portion is several times higher. Since it has a high insulation strength, a cast insulator that can withstand a higher electric field can be obtained, and insulation deterioration due to the internal corona, etc. can be prevented. It can be obtained easily and economically.

Further, in the present invention, the highly insulating gas is replaced with air molecules in the casting tank in which the casting is held, and in this state, the insulating material is put in the casting. In the injection process, the high insulating gas is contained in all the bubbles generated and mixed in the insulating material, so that the insulating strength is several times higher than that of conventional bubbles. As a result, it has sufficient insulation strength to withstand the electric field used up to now, and even when used under higher electric field conditions, insulation deterioration due to the internal corona etc. is prevented and a long-life cast insulating member can be easily used. Can be obtained.

[0009]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a casting tank equipped with a lid 1a that can be opened and closed, and 2 is a mixing tank that is configured so that it can be sealed. The means 2a is provided. The mixing tank 2 is connected to the casting mold 3 housed in the casting tank 1 through the flow path 4, and the insulating material in the mixing tank 2 is cast into a fluid state so that it can be poured into the casting mold. I am going to introduce it in 3.
Further, a shape corresponding to the product is formed on the inner surface of the casting mold 3, and an inflow port is formed at the upper position. A vacuum pump 5 is connected to each of the casting tank 1 and the mixing tank 2 so as to remove air. Reference numeral 6 denotes a gas tank which is connected to the mixing tank 2 and is filled with gas after the air in the mixing tank 2 is removed by the vacuum pump 5. Reference numeral 7 is a heating device composed of an electric heater or the like, and is disposed so as to heat and heat the casting mold 3 and the mixing tank 2. Reference numeral 8 is a high-voltage source, which is connected to the flow path 4 via a branch pipe 9 so as to apply a high pressure to the insulating material injected into the casting mold 3.

Next, the operation will be described. Mixing tank 2
In addition to the conventional vacuum casting method in which the main raw material, the curing material, and the auxiliary materials are charged and hermetically sealed, heated, stirred, and vacuum degassed, after the vacuum degassing is completed, a gas tank 6 is used to remove SF6 gas such as A highly insulating gas is supplied to the mixing tank 2 up to an appropriate pressure, and after a while, the gas is sufficiently diffused and impregnated in the resin, and then the vacuum pump 5 is operated again to add a step of discharging the excess gas and mixing. The process. The insulating material obtained in this manner, in which mainly highly insulating gas molecules remain, is injected into the casting mold 3 housed in the casting tank 2 which is held in a vacuum state to carry out a curing reaction and to be manufactured. It is the one.

Embodiment 2. In addition, in Example 2, the main raw material, the curing material, and the auxiliary materials are added to the mixing tank 2 in the above-described Example 1, and the mixture is sealed and heated and stirred,
In addition to the conventional vacuum casting method of vacuum degassing, after completing the vacuum degassing, the insulating gas is supplied from the gas tank 6 to an appropriate pressure in the mixing tank 2, and after a while, the gas is sufficiently diffused and impregnated in the resin. After that, the vacuum pump is operated again and the insulating material generated through the process of discharging the surplus gas is injected into the casting form by the conventional pressure casting method, and then high pressure is applied to the injected resin from the high pressure source 8. Press to cure. By doing so, since all the bubbles are filled with the highly insulating gas and further compressed and hardened, the pressure in the reduced bubbles is increased and a higher insulating performance is obtained. .

Embodiment 3. Further, in the third embodiment, the fluid insulating material produced by performing vacuum deaeration in the mixing tank 2 and gas impregnation treatment at substantially atmospheric pressure in the above-described first embodiment is cast in the flow path 4 by casting 3. And then cured by a conventional method of normal pressure casting to manufacture.

Embodiment 4. FIG. 2 shows still another embodiment. In FIG. 2, 1 to 8 show the same or corresponding parts as in FIG. 1, 5 is a vacuum pump, which is connected to the casting tank 1. Eliminate the air in it. Reference numeral 6 denotes a gas tank, and after the air in the casting tank 1 is removed by the vacuum pump 5, the inside of the casting tank 1 is filled with gas. Others are the same as in FIG.

Next, the operation will be described. Air inside the casting tank 1 is removed by the vacuum pump 5, and then the inside of the casting tank 1 is supplied with a highly insulating gas from the gas tank 6 to fill the gas to an appropriate pressure. Then, an insulating material is injected into the casting mold 3 housed in the casting tank 1 from the mixing tank 2 and cured. By replacing the air in the casting tank 1 with a highly insulating gas as described above, in the process of casting the insulating material in the next casting mold, all the bubbles mixed in the insulating material are generated. The high-insulating gas is now enclosed, which makes it possible to obtain a cast insulator with good insulating properties. In addition,
When filling the insulating gas, which has a higher specific gravity than air, when filling the gas, fill it from the lower position of the casting mold, and in the opposite case, from the upper position, so that replacement can be performed reliably in a short time. it can.

Example 5. In the above injection process,
By supplying a high-pressure fluid from the high-pressure source 8 and applying a high pressure to the casting mold 3, the bubbles existing in the fluid insulating material can be reduced, and the high-insulation filled in the bubbles and having a high pressure. The electric field strength is greatly increased by the gas having the property.

[0016]

As described above, according to the present invention, in the mixing process of the insulating material in which the most bubbles are easily mixed in the casting insulating member, the bubbles generated in the insulating material are almost eliminated and the bubbles are generated. Since the size of itself is reduced and all the bubbles are filled with the highly insulating gas, the electric field strength is increased to the same level as that of a pure and pure insulating member having no bubbles. Therefore, not only can the insulation performance of pure insulation members be effectively utilized, but a device with a high corona generation level and high insulation reliability can be configured in a small size, and most of the existing manufacturing equipment will be changed. There is an effect obtained by an economical and easy manufacturing method that can be used without any need.

Further, according to the present invention, even when a bubble exists inside the casting insulating member, the highly insulating gas can be confined in the bubble during the injection process, and the electric field strength of itself is high. Since the deterioration of the insulation is prevented or the higher electric field can be applied, the reliability of the insulation can be improved and the device can be configured in a small size. It can be used without any cost and is obtained by an economical and easy manufacturing method.

[Brief description of drawings]

FIG. 1 is a schematic system diagram showing an outline of manufacturing equipment for a cast insulator according to an embodiment of the present invention.

FIG. 2 is a schematic system diagram showing an outline of manufacturing equipment for a cast insulator according to another embodiment of the present invention.

[Explanation of symbols]

 1 Casting tank 2 Mixing tank 3 Casting type 4 Flow path 5 Vacuum pump 6 Gas tank 7 Heating device 8 High pressure source

Claims (2)

[Claims] 1. A method for producing an insulating material by injecting a thermosetting insulating material containing epoxy resin or the like as a main component into a casting form, in a mixing tank of the insulating material before being injected into the casting form. The production process is performed in an atmosphere in which the inside of the mixing tank is degassed in vacuum and replaced with a highly insulating gas with high insulation strength, and then this insulating material is placed in a vacuum casting tank. A method for producing a cast insulating material, characterized by injecting it into a cast shape housed in a container and carrying out a curing reaction to produce it. 2. In a method for producing an insulator by injecting a thermosetting insulating material containing epoxy resin or the like as a main component into a casting mold, first, a vacuum treatment is performed in a casting tank holding the casting mold. Then, the tank is filled with an insulating gas having a higher insulation strength than that of air, and the inside of the casting tank is filled with an insulating gas, and the inside of the casting tank is filled with the insulating gas. A method for producing a cast insulation material, which comprises injecting an insulating material into a mold and performing a curing reaction to produce the same.