Flame-retardant dry-type air-core reactor

Abstract

The utility model discloses a flame-retardant dry-type air-core reactor which comprises a reactor coil, the reactor coil is formed by connecting multiple layers of cylindrical packages in parallel, the interiors of the packages are continuously wound by transposition aluminum stranded wires, the exteriors of the packages are package inner and outer insulating layers, air channels between the packages are supported by drawing rods, and the two ends of the reactor coil are provided with structural star-shaped frames. And the reactor coil and the star-shaped frame are fastened into a whole by vertical binding. Star arms of the star-shaped frame are formed by horizontal binding and are formed by high-temperature curing to form a firm whole. The utility model has the characteristics of flame retardance, explosion prevention, safety, reliability and maintenance-free property.

Description

Technical Field

[0001] The utility model belongs to the technical field of reactors, and in particular relates to a flame-retardant dry-type air-core reactor. Background Art

[0002] Dry-type air-core reactors are used in power supply systems to limit current, filter harmonics, prevent overvoltage, maintain the reactive power balance of power systems, etc. They are key electrical equipment in high-voltage power transmission. Currently, the main cause of failure of dry-type air-core reactors is turn-to-turn short circuit. After the turn-to-turn short circuit, the temperature at the short circuit point rises rapidly, and the reactor may catch fire. If the reactor is not removed in time, it is bound to cause a fire.

[0003] With the development of power grids, the safe operation of power grid equipment is particularly important, especially for indoor substations. If traditional dry-type air-core reactors are used and a short circuit occurs between turns and a fire occurs, a large amount of thick smoke will be generated, which may affect the safety of the entire power grid equipment. The use of flame-retardant dry-type air-core reactors can greatly reduce the risk of fire and avoid causing larger accidents. Summary of the invention

[0004] In order to overcome the above technical problems, the purpose of the utility model is to provide a flame-retardant dry-type air-core reactor, which has the characteristics of flame retardancy, explosion-proof, safe and reliable, and maintenance-free.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A flame-retardant dry-type hollow reactor comprises a reactor coil, which is a multi-layer cylindrical package connected in parallel. The interior of the package is continuously wound with transposed aluminum stranded wires, and the exterior of the package is an inner and outer insulation layer of the package. The airway between each package is supported by a pull-out rod. The upper and lower ends of the reactor coil are structural star frames, and the reactor coil and the star frame are fastened together by vertical binding.

[0007] The star arms of the star frame are formed by horizontal binding and are formed by high temperature curing to form a firm whole.

[0008] An external lead-out wire is arranged on the transposed stranded wire continuously wound inside the reactor coil, and the external lead-out wire is welded to the star frame by argon arc welding.

[0009] The innermost and outermost envelope surfaces of the reactor coil are sprayed with coatings, and the outer ends of the star frames at both ends of the reactor coil are provided with wiring terminals for connecting to the power system. The structural parts used in the flame-retardant dry-type air-core reactor are all produced with flame-retardant organic insulating materials, and the materials used are all FV-0 grade.

[0010] The coil of the reactor is wound into a multi-layer cylindrical structure using a flat transposed aluminum stranded wire, and the transposed aluminum stranded wire is wound by 2-3 strands of wires being twisted into one transposed wire. This is convenient to operate and the winding process is precisely controlled. The insulating film wrapped around the transposed aluminum stranded wire 1 is made of a polyimide film with a heat resistance grade of H. The material itself is flame retardant, and the flame retardant grade is FV-0.

[0011] The coil encapsulation is formed by spirally winding the inner and outer insulating layers, and the inner and outer insulating layers are encapsulated with glass fiber impregnated with reactive flame retardant epoxy resin glue, with a flame retardant grade of FV-0. The inner and outer insulating layers are encapsulated with reactive flame retardant epoxy resin impregnated alkali-free glass fiber wrapped around the transposed aluminum stranded wire.

[0012] The coil airway of the reactor adopts a drawing rod as a support between the coil packages, and the drawing rod is added with a halogen-free environmentally friendly flame retardant, and its flame retardant grade is FV-0.

[0013] The coil of the reactor is fastened to the star frame as a whole by vertical binding, and the star arms of the star frame are formed by horizontal binding. The vertical binding and horizontal binding are added with halogen-free environmentally friendly flame retardant, and the flame retardant grade is FV-0.

[0014] The reactor coil adopts air magnetic conductivity, has no iron core, and the insulation materials are all flame retardant, so it is called a flame retardant dry air reactor.

[0015] Beneficial effects of the utility model:

[0016] According to the utility model, when an accident fire occurs in a transformer substation and the reactor switch is cut off, the flame of the accident reactor will gradually extinguish itself, thereby ensuring the safety of other equipment in the transformer substation.

[0017] Among them, the reactor coil is a multi-layer cylindrical encapsulated parallel structure. The inside of the encapsulation is continuously wound with transposed aluminum stranded wire, and the outside of the encapsulation is an inner and outer insulation layer. The airway between each encapsulation is supported by a pull rod. The two ends of the reactor coil are structural star frames, and the reactor coil and the star frame are fastened together by vertical binding. The star arms of the star frame are formed by horizontal binding, and are formed by high-temperature curing to form a solid whole. At the same time, the insulating material used in the flame-retardant dry-type air-core reactor coil is different from that of previous coils. It has the characteristics of flame retardancy, explosion-proof, safe and reliable, and maintenance-free. It effectively reduces the risk of reactor fire after a product accident and greatly reduces the risk of fire for other equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a flame-retardant dry-type air-core reactor. DETAILED DESCRIPTION

[0019] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0020] like Figure 1 As shown: the insulation of the coil transposed aluminum stranded wire 1 of the reactor is wrapped with a polyimide film, and multiple strands are combined and wrapped with a polyimide film and a polyimide composite cloth to form an H-class flat transposed aluminum stranded wire.

[0021] The polyimide film material wrapped around the transposed aluminum stranded wire 1 is inherently flame retardant, with a flame retardant grade of FV-0.

[0022] Reactive flame-retardant epoxy resin glue is impregnated with alkali-free glass fiber and wrapped to form inner and outer insulation layers 2. Epoxy resin glue has excellent bonding, mechanical and electrical insulation properties and can be widely used in various fields. However, ordinary non-flame-retardant epoxy resin cured products are mainly composed of C, H, and O elements and are flammable at high temperatures. For this reason, modified P-containing flame-retardant anhydride curing agent is used to replace the traditional anhydride curing agent, and mixed with bisphenol A epoxy resin according to the ratio to form a reactive flame-retardant epoxy resin glue. The reactive flame-retardant epoxy resin glue has low viscosity and good wettability for glass fiber. The P element is introduced into the anhydride curing agent molecule through chemical reaction to form a reactive P-containing flame-retardant anhydride curing agent. There is no characteristic that the flame retardant is unstable and easy to migrate after the additive flame retardant is cured. The cured product has good mechanical properties, heat resistance and flame retardant properties. The flame retardant grade is FV-0 after high-temperature curing and molding. All performances meet the requirements for the use of reactors.

[0023] The coil is fastened by using reactive flame retardant epoxy resin glue impregnated glass fiber to be vertically tied to the star frame 5, and the star frame 5 is fastened by using reactive flame retardant epoxy resin glue impregnated glass fiber tape to be horizontally tied 6.

[0024] The coil airway support of the reactor uses flame-retardant drawing rods 3 as the support between the packages to form a vertical heat dissipation airway. The flame-retardant drawing rods achieve the flame retardancy level FV-0 by adding halogen-free environmentally friendly flame retardants during the pultrusion production process. The inner and outer surfaces of the reactor are coated with RTV-Ⅱ glue, and the material itself is flame-retardant, with a flame retardancy level of FV-0.

[0025] By adopting the utility model, after the reactor cuts off the circuit, when the reactive P-containing flame-retardant epoxy resin cured material is burned, phosphoric acid and metaphosphoric acid will be generated to promote the dehydration and carbonization of the body, so that the material forms more protective carbon layers. The dense carbon layer has high thermal stability and can greatly block heat and oxygen, and the reactor will gradually self-extinguish.

[0026] The working principle of this utility model:

[0027] The transposed aluminum stranded wire 1 is wound using a tool, and the inner and outer insulating layers 2 are wrapped with reactive flame-retardant epoxy resin impregnated alkali-free glass fibers. An air duct support is added between each layer of the multi-layer cylindrical parallel structure. The upper and lower star frames 5 are vertically tied 3 and horizontally tied 6 into one piece with reactive flame-retardant epoxy resin impregnated glass fiber tape, and then cured at high temperature. Each encapsulated lead wire of the transposed aluminum stranded wire 1 is welded to the star arm of the upper and lower star frames 5 by argon arc welding. The innermost and outermost encapsulated surfaces of the reactor coil are sprayed with a coating 7, and the upper and lower star frames 5 are provided with wiring terminals 8 to achieve connection with the power system.

Claims

1. A flame-retardant dry-type air-core reactor, characterized in that: The invention comprises a reactor coil, which is a multi-layer cylindrical package connected in parallel. The interior of the package is continuously wound with transposed aluminum stranded wire (1), and the exterior of the package is an inner and outer insulation layer (2). The air passage between each package is supported by a drawing rod (3). The upper and lower ends of the reactor coil are structural star frames (5). The reactor coil and the star frame (5) are fastened together by vertical binding (4).

2. A flame-retardant dry-type air-core reactor according to claim 1, characterized in that: The star arms of the star frame (5) are formed by horizontal binding (6).

3. A flame-retardant dry-type air-core reactor according to claim 1, characterized in that: An external lead wire is arranged on the transposed stranded wire (1) continuously wound inside the reactor coil, and the external lead wire is welded to the star frame (5) by argon arc welding.

4. A flame-retardant dry-type air-core reactor according to claim 1, characterized in that: The innermost and outermost envelope surfaces of the reactor coil are sprayed with coatings (7), and the outer ends of the star frames (5) at both ends of the reactor coil are provided with connection terminals (8) for connection with the power system.

5. The flame-retardant dry-type air-core reactor according to claim 1, characterized in that: The coil of the reactor is wound into a multi-layer cylindrical structure using a flat transposed aluminum stranded wire (1), wherein the transposed aluminum stranded wire (1) is wound by combining 2-3 strands of wire into one transposed wire.

6. The flame-retardant dry-type air-core reactor according to claim 1, characterized in that: The inner and outer insulating layers (2) are encapsulated by spiral winding to form a coil encapsulation, and the inner and outer insulating layers (2) are encapsulated by glass fibers impregnated with reactive flame-retardant epoxy resin glue.

7. The flame-retardant dry-type air-core reactor according to claim 1, characterized in that: The coil airway of the reactor uses a drawing rod (3) as support between coil packages.

8. The flame-retardant dry-type air-core reactor according to claim 1, characterized in that: The reactor coil is air-conductive and has no iron core.

Images