KR20190136481A - Current transformer covering material, method for munufacturing current transformer covering material, method for covering current transformer using the same - Google Patents

Abstract

The present invention relates to a manufacturing method of a current transformer covering material for an instrument, which comprises the steps of: manufacturing an organic mixture by mixing an unsaturated resin, an adhesive material, an elastic material, a first antifoaming agent, a second antifoaming agent, a binder, and a curing agent with each other; manufacturing an inorganic mixture by mixing first silicon oxide of different sizes, second silicon oxide, aluminum hydroxide and titanium dioxide with each other; and mixing the organic mixture and the inorganic mixture to manufacture the current transformer coating material for an instrument.

Description

Coating material of instrument current transformer, manufacturing method thereof, and method of coating current transformer using the same

The present invention relates to an instrument current transformer, and more particularly, to a covering material of an instrument current transformer and a method of coating an instrument current transformer using such a coating material.

In general, the electricity trade meter has a single type and a transformer type, and if the user's power consumption exceeds a certain capacity, the single type electricity meter is large in size and cannot be installed and manufactured. Current transformer (CT) is installed to reduce the current by a certain ratio, and after integrating the current to the transformer meter, the multiplier is multiplied by the usage guideline to measure the usage.

Instrument current transformer is installed in switchgear on high voltage line through which high voltage electricity flows or in place to secure power for monitoring and management system for high voltage management and is used in various fields such as line, breaker or transformer.

These current transformers come in two types, which are divided into general current transformers and split current transformers. Since double current transformers (for example, ring type current transformers) are integrally formed, in case of initial construction on the track, assemble the current transformers first when installing the current transformers in the enclosure of the breaker, the inside of the transformer, the busbar or cable of the switchboard, etc. The device is assembled to penetrate the center of the current transformer.

In other words, since the general current transformer is integrally formed without a separate configuration, since the current transformer is installed first, the cable passes through the through hole formed in the center, and thus, the current transformer is used under the premise that there is no dismantling and expansion of the current transformer. Therefore, in case of general current transformer, if the current transformer accident occurs due to user's careless operation or additional expansion of current transformer occurs, the current transformer should be disconnected and the current transformer should be replaced after dismantling the cable assembled in the line. There is a problem that it is not easy.

1 is a perspective view of a conventional ring-type instrument current transformer. The ring type current transformer 1 may include a main body 10, a through hole 14, and a plurality of current terminals 12 and 12a. The main body 10 is formed in the ring (cylindrical) shape which has a predetermined diameter and thickness (88 mm x 44 mm). In the primary load wire through hole 14, the inner diameter of the main body 10 is penetrated to a predetermined diameter (40 mm), and sufficient space for the primary load wire to pass through the through hole 14 is provided. The current terminals 12 and 12a are composed of a plurality of (+ and-terminals) at one end of the outer periphery of the main body 10 so that the wires are wired. The current terminals 12 and 12a are coupling means for connecting the wires, for example , Bolts or joints.

The outer surface of the ring-type instrument current transformer is covered by the cover material. However, in case of the existing cover material, the coefficient of linear expansion is significantly different from that of the ring-type instrument current transformer, which causes the cover material damage due to air bubbles and cracks due to the temperature difference. have. In addition, when the coating material is damaged, electrical insulation breakdown occurs, leading to an explosion or fire.

Accordingly, the present inventors have developed a new coating material which can prevent damage to the coating material while improving ductility by improving the existing coating material.

Registration Utility Model Registration No. 20-0471248 (Registration date 2014.02.04.)

The technical problem to be solved by the present invention is to provide a current transformer covering material for a meter and a method of manufacturing such coating material while having a softness and corresponding to the coefficient of thermal expansion of the current transformer for the meter.

Another object of the present invention is to provide a method for covering an instrument current transformer using an instrument current transformer covering material.

In order to solve the above technical problem, the current transformer coating material manufacturing method according to an embodiment of the present invention by mixing an unsaturated resin, an adhesive material, an elastic material, a first antifoaming agent, a second antifoaming agent, a binder, a curing agent Preparing an organic mixture; Preparing an inorganic mixture by mixing the first silicon oxide, the second silicon oxide, the aluminum hydroxide, and the titanium dioxide having different sizes with each other; And mixing the organic mixture and the inorganic mixture to produce an instrument current transformer coating material.

In one embodiment, the unsaturated resin is polyester, the adhesive material is a terephthalic material, the elastic material is ethylene glycol, and the first antifoaming agent has a first ratio It is a silicone-based polymer defoamer, the second defoamer is a second non-silicone-based polymer defoamer, the binder is a silane, the curing agent may be a curing agent for unsaturated polyester resin.

The terephthalic material may be terephthalic acid or dimethyl terephthalate.

The first antifoaming agent is BYK-A501 manufactured by BYK-Chemie, the second antifoaming agent is preferably BYK-A505 produced by BYK-Chemie.

The curing agent is preferably MEKP (Methyl Ethyl Ketone Peroxide).

In one embodiment, the organic mixture comprises 15 g polyester, 65.7 g adhesive, 7.2 g elastic material, 0.3 g first antifoam, 0.3 g second antifoam, 2 g silane, and 1 g hardener. can do.

In one embodiment, the inorganic mixture may include 117g of first silicon oxide (purity 99.9%), 18g of second silicon oxide (purity 99.9%), 19g of aluminum hydroxide and 7g of titanium dioxide.

In one embodiment, the size of the first silicon oxide is greater than 0.23 and less than 0.33 mm,

The size of the second silicon oxide may be greater than 0 and less than 0.23 mm.

The instrument current transformer covering method according to an embodiment of the present invention is made of a silicon material, the step of inserting the instrument current transformer in a mold including a current transformer insert that can accommodate the instrument current transformer; And covering the instrument current transformer using the instrument current transformer covering material.

In one embodiment, the covering the instrument current transformer using the instrument current transformer covering material may be performed in a space between the instrument current transformer and the current transformer insertion part while spaced apart from the current transformer current transformer and the current transformer insertion part. Injecting said instrument current transformer coating material; Removing bubbles generated in the current transformer covering material; And curing the instrument current transformer coating material.

Instrument current transformer covering material according to an embodiment of the present invention is 15g polyester, 65.7g adhesive material, 7.2g elastic material, 0.3g first antifoaming agent, 0.3g second antifoaming agent, 2g silane and 1g An organic mixture comprising a curing agent of; And an inorganic mixture comprising 117 g of first silicon oxide (purity 99.9%), 18 g of second silicon oxide (purity 99.9%), 19 g of aluminum hydroxide, and 7 g of titanium dioxide.

In an embodiment, the size of the first silicon oxide may be greater than 0.23 and less than or equal to 0.33 mm, and the size of the second silicon oxide may be greater than 0 and less than 0.23 mm.

The coating material according to the embodiment of the present invention as described above corresponds to the thermal expansion coefficient of the current transformer CT for the instrument, and has a ductility, thereby preventing cracks or bubbles from occurring in the coating material due to external temperature change. .

In addition, cracks or bubbles are generated in the coating material to prevent electrical insulation breakdown, thereby preventing a fire in the instrument current transformer or exploding the instrument current transformer.

1 is a perspective view of a conventional ring-type instrument current transformer.
2 is a flowchart illustrating a method of manufacturing a current transformer covering material for an instrument according to an embodiment of the present invention.
3 is a flow chart of a current transformer covering method for an instrument according to an embodiment of the present invention.
4A is a side cross-sectional view of a mold used for covering a current transformer for an instrument in accordance with an embodiment of the present invention.
Figure 4b is a plan sectional view of a mold used for covering the current transformer for the instrument according to an embodiment of the present invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like numbers refer to like elements in the figures.

2 is a flowchart illustrating a method of manufacturing a current transformer covering material for an instrument according to an embodiment of the present invention.

Referring to FIG. 2, the method of manufacturing the current transformer covering material for an instrument according to an embodiment of the present invention includes preparing an organic mixture (S120), preparing an inorganic mixture (S140), and mixing an organic mixture and an inorganic mixture. Step S160 may be included.

An organic resin is prepared by mixing an unsaturated resin, an adhesive material, an elastic material, a first antifoaming agent, a second antifoaming agent, a binder, and a curing agent (S120).

For example, the unsaturated resin is polyester, the adhesive material is a terephthalic material, the elastic material is ethylene glycol, the first antifoaming agent is a first non-silicone polymer antifoaming agent, and the second The antifoaming agent may be a second non-silicone polymer antifoaming agent, the binder is a silane, and the curing agent may be a curing agent for unsaturated polyester resin.

The binder is tri-methacryloxypropyl propyltrimethoxysilane, and it is preferable to use the product name A-174.

Binders (silane coupling agents) are chemicals that have two different reactors, organic and inorganic, on the same molecule, and two different materials such as inorganic materials such as glass, metals, minerals, and organic materials such as organic polymers, coatings, adhesives, etc. It acts as a contact point in the middle for the bonding of materials.

In one example, the organic mixture comprises 15 g of polyester, 65.7 g of adhesive material, 7.2 g of elastic material, 0.3 g of first antifoam, 0.3 g of second antifoam, 2 g of silane, and 1 g of hardener.

Next, an inorganic mixture is prepared by mixing the first silicon oxide, the second silicon oxide, the aluminum hydroxide, and the titanium dioxide having different sizes (S140).

In one example, the inorganic mixture includes 117 g of first silicon oxide (purity 99.9%), 18 g of second silicon oxide (purity 99.9%), 19 g of aluminum hydroxide, and 7 g of titanium dioxide.

As an example, the size of the first silicon oxide is greater than 0.23 and 0.33 mm or less, and the size of the second silicon oxide is more than 0 and less than 0.23 mm.

In order to improve the electrical properties (for example, breakdown voltage, etc.) while the double bond of carbon is alive at the time of unsaturated polyester curing, silicon oxide having a very small particle size and stable properties is preferably used.

The inorganic mixture is mixed using a container separate from the organic mixture, and other containers of the same kind used for mixing the organic mixture may be used.

Next, the organic mixture and the inorganic mixture are mixed (S160). In one example, the organic mixture and the inorganic mixture may be mixed using a hand mixer.

In particular, the mixing of the organic mixture and the inorganic mixture is effected by applying vibration under vacuum conditions, and the degree of vacuum is preferably 10 to 30 mmHg. By vibrating under the vibration conditions, the organic mixture and the inorganic mixture mix with each other, thereby completely removing bubbles that may occur through the mixing.

In addition, the current transformer coating material manufacturing process is preferably performed at room temperature. When performed at room temperature, the shrinkage ratio between the resin particles can be minimized, and the thermal shrinkage can be minimized, thereby minimizing the dimensional cracking and mechanical stress remaining in the manufactured current transformer cover material.

Through such a process, a current transformer covering material for an instrument according to an embodiment of the present invention is manufactured.

Figure 3 is a flow chart of a current transformer covering method for the instrument according to an embodiment of the present invention, Figure 4a is a side cross-sectional view of a mold used for covering the instrument current transformer according to an embodiment of the present invention, Figure 4b is an embodiment of the present invention Sectional plan view of a mold used for covering the current transformer for instruments.

3 to 4b, the instrument current transformer covering method according to an embodiment of the present invention is the step of inserting the instrument current transformer to the current transformer insertion unit (S220) and the instrument current transformer covering by using the current transformer covering material for the instrument It may include the step (S240).

Current transformer insert is made of a silicon material, it can accommodate the current transformer for the instrument. The current transformer insertion unit has a space in which the current transformer for the instrument can be inserted.

The current transformer insertion unit may be included in the mold and disposed in close contact with the mold inner circumferential surface.

When the instrument current transformer is inserted into the current transformer insertion portion, the current transformer for the instrument is covered by using the current transformer covering material according to the embodiment of the present invention.

For example, the step of covering the meter current transformer using the meter current transformer covering material is a step of injecting the meter current transformer covering material into the space between the meter current transformer and the current transformer insertion part while separating the meter current transformer and the current transformer insert. S242), removing the bubbles generated in the instrument current transformer coating material (S244) and curing the instrument current transformer coating material (S244).

With the current transformer current transformer and the current transformer insertion part spaced apart, in order to put the current transformer cover material into the space between the current transformer current transformer and the current transformer insertion part, the current transformer is inserted into the current transformer insertion part and then the current transformer insertion part is The instrument current transformers are to be spaced at a constant interval.

Next, the instrument current transformer covering material is introduced into the space between the instrument current transformer and the current transformer insertion portion. To this end, an input space may be formed between the handle and the mold, and the handle and the current transformer insert.

Next, bubbles generated in the instrument current transformer covering material are removed.

As an example, bubbles may be removed by applying vibration under vacuum conditions, and the degree of vacuum may be 10 to 30 mmHg.

After the bubbles have been removed, the instrument current transformer coating material is cured. Curing may proceed at room temperature. When the curing is completed, the instrument current transformer coated with the coating material is separated from the mold and polished, and the coating state is inspected to check for defects.

Although embodiments according to the present invention have been described above, these are merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments of the present invention are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the following claims.

Claims (9)

Preparing an organic mixture by mixing an unsaturated resin, an adhesive material, an elastic material, a first antifoaming agent, a second antifoaming agent, a binder, and a curing agent;
Preparing an inorganic mixture by mixing the first silicon oxide, the second silicon oxide, the aluminum hydroxide, and the titanium dioxide having different sizes with each other; And
Mixing the organic mixture and the inorganic mixture to produce an instrument current transformer coating material.
The method of claim 1,
The unsaturated resin is polyester,
The adhesive material is a terephthalic (Tere-Phthalic) material,
The elastic material is ethylene glycol (Ethylene glycol),
The first antifoaming agent is a first non-silicone polymer antifoaming agent,
The second antifoaming agent is a second non-silicone polymer antifoaming agent,
The binder is a silane,
And said curing agent is a curing agent for unsaturated polyester resins.
The method of claim 2,
The coating material
A method for manufacturing an instrument current transformer coating material comprising 15 g polyester, 65.7 g adhesive material, 7.2 g elastic material, 0.3 g first antifoam, 0.3 g second antifoam, 2 g silane and 1 g hardener. .
The method of claim 1,
The inorganic mixture,
A method for manufacturing an instrument current transformer coating material comprising 117 g of first silicon oxide (99.9% pure), 18 g of second silicon oxide (99.9% pure), 19 g of aluminum hydroxide, and 7 g of titanium dioxide.
The method of claim 1,
The size of the first silicon oxide is greater than 0.23, 0.33 mm or less,
And the second silicon oxide has a size greater than 0 and less than 0.23 mm.
Inserting the instrument current transformer into a mold made of a silicon material and including a current transformer insertion portion capable of receiving an instrument current transformer therein;
A method for covering an instrument current transformer, comprising coating the instrument current transformer using the instrument current transformer covering material of any one of claims 1 to 5.
The method of claim 7, wherein
Covering the instrument current transformer using the instrument current transformer covering material,
Injecting the instrument current transformer covering material into a space between the instrument current transformer and the current transformer insertion portion with the instrument current transformer and the current transformer insertion portion separated from each other;
Removing bubbles generated in the current transformer covering material; And
And curing the instrument current transformer coating material.
An organic mixture comprising 15 g polyester, 65.7 g adhesive material, 7.2 g elastic material, 0.3 g first antifoam, 0.3 g second antifoam, 2 g silane, and 1 g hardener; And
An instrument current transformer covering material comprising an inorganic mixture comprising 117 g of first silicon oxide (99.9% pure), 18 g of second silicon oxide (99.9% pure), 19 g of aluminum hydroxide, and 7 g of titanium dioxide.
The method of claim 8,
The size of the first silicon oxide is greater than 0.23, 0.33 mm or less,
A current transformer covering material for instrument, wherein the size of the second silicon oxide is greater than 0 and less than 0.23 mm.

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