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Fully-closed ceramic sintered dry-type transformer coil and manufacturing method thereof
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A technology for dry-type transformers and manufacturing methods, which is applied in the direction of transformer/inductor coil/winding/connection, coil manufacturing, etc., which can solve the problems of insulators being afraid of moisture, short circuit, and shortened service life, and achieve high insulation heat resistance and moisture resistance Good water barrier and good fire performance
Inactive Publication Date: 2013-01-02
济南特变电气有限公司
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Abstract
Description
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In addition, the insulators of the existing dry transformers are afraid of moisture, especially the open-ventilated dry transformer coils are more affected by moisture
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Embodiment 1
[0025] This embodiment includes a conductor and an insulator, and is characterized in that the conductor is a bare conductor 3, the insulator 4 is ceramics, the insulator 4 and the bare conductor 3 are sintered together, the outside of the insulator 4 is coated with glaze 5, and the outer surface of the bare conductor 3 is coated with Glaze, the insulator 4 is porcelain, which can be made by the following process:
[0026] (1) coil winding: wind the bare conductor 3 into a coil on the porcelain cylinder 1;
[0027] (2) Sealed coil: The turns, layers, segments and surroundings of the coil are completely wrapped with clay; use one of the methods of die-casting, pouring, die-casting, molding, forging, etc. to seal the coil with ceramic clay or porcelain clay. Pack tightly and compact into green body, glaze 5;
[0028] (3) Firing into one: put the green body in a furnace with a temperature of 650°C to 1500°C, sinter or bake it into pottery, and form a whole with the bare conducto...
Embodiment 2
[0030] When insulator 4 is pottery, can adopt following process to make:
[0031] (1) Coil winding: winding into a coil at the bare conductor 3;
[0032] (2) Sealed coil: The coils are completely wrapped with porcelain clay between turns, layers, segments, and around the coil; the porcelain clay is used to wrap the coil tightly with die-casting, pouring, die-casting, molding, forging, etc. Solid body, glaze 5;
[0033] (3) Firing into one: put the green body in a furnace with a temperature of 650°C to 1500°C, sinter or bake it into porcelain, and form a whole with the bare conductor.
Embodiment 3
[0035] When the lining strip 2 is arranged inside the coil, the lining strip 2 is coated with glaze, and the lining strip 2 is a solid or hollow structure, which can be manufactured by the following process:
[0036] (1) Coil winding: wind the bare conductor 3 on the porcelain cylinder 1 to form a coil, place lining strips such as ceramic strips or porcelain strips between the layers, and glaze 5;
[0037] (2) Sealed coil: The coils are completely wrapped with ceramic mud between turns, layers, segments and around the coil; use one of the methods such as die-casting, pouring, die-casting, molding, forging, etc. to wrap the coil tightly with ceramic mud Solid body, glaze 5;
[0038] (3) Firing into one body: put the green body in a furnace at a temperature of 650°C to 1500°C, and form a whole body by sintering or baking.
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Abstract
The invention relates to a transformer coil, in particular to a fully-closed ceramic sintered dry-type transformer coil and a manufacturing method thereof. The ceramic sintered dry-type transformer coil comprises a conductor and an insulator, and is characterized in that: the conductor is a bare conductor, and the insulator is ceramic; and the manufacturing method of the fully-closed ceramic sintered dry-type transformer coil comprises: a process step I of winding a coil, which is to coat glaze on the surface of the bare conductor and winding the bare conductor into a coil; a process step II of sealing the coil, which is to envelope the space between the turns, layers and sections of the coil and the four sides of the coil completely by using ceramic paste, compacting the ceramic paste orcoating and compacting the coil by the ceramic paste to obtain a blank body, and coatingglaze; and a process step III of burning the coil integrally, which is to sinter or bake the ceramic paste into pottery or ceramic and integrate the pottery or ceramic with the bare conductor. In a word, transformer coil has the advantages that: the insulation and heat resistance grades are high; no harmful gas is generated at high temperature; the dampproof performance and waterproof performance are high, so the coil can operate even when put in water; and the service life of the coil is long.
Description
technical field [0001] The invention relates to a transformer coil, in particular to a fully enclosed ceramic sintered dry-type transformer coil and a manufacturing method thereof. Background technique [0002] The coils of existing dry-type power transformers (hereinafter referred to as dry transformers) mainly include resin-casting type and open-ventilated type, that is, impregnated paint type. Resin casting type dry change casts epoxy resin on the coil with wire insulation. Since epoxy resin is an organic substance, once it encounters high temperature or open flame, it will release a large amount of poisonous and harmful gas, or even burn. The resistance of the dry change The thermal insulation grade is F grade, that is, 155°C; the heat-resistant insulation grade of the coil of the open-air dry transformer is H grade, that is, 180°C, and the coil wire is wrapped with Nomex paper or polyimide film, both of which are Organic substances will burn when encountering high temp...
Claims
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Application Information
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