CN101064212A - 35kv 3-phase dry type hollow current-limiting reactor - Google Patents

Abstract

The invention relates to a 35 kV three-phase dry-type air-core current-limiting reactor, which includes a coil, an insulating cylinder, and an upper and lower support plate, and is characterized in that the coil of the reactor is wound on the insulating cylinder with a copper stranded wire composed of a plurality of thin copper wires. On the outside, the copper stranded wire is covered with an insulating layer, and the outside of each layer of coils is coated with epoxy resin curing agent; between each layer of coils, there is an F-class insulated cold-drawn air duct strip, and its upper and lower ends are provided with terminal insulation. The thickness of the end insulation is the same as the diameter of the wire; pass through the air duct strip and the end insulation through the insulation thread, and rivet the air duct strip to the end insulation and the supporting plate. It has the advantages of simple and reasonable structure, strong ability to resist short-circuit current, good electrical performance, small size, light weight, small loss and low noise.

Description

35 kV three-phase dry-type air-core current-limiting reactor

Technical field

The invention relates to a dry-type hollow current-limiting reactor.

Background technique

The dry-type air-core current-limiting reactor has only coils and no iron core. The magnetic circuit is a non-magnetic material with a large reluctance and a small inductance value. There is no saturation phenomenon. The inductance value is a constant. Due to the good electrical It is widely used in various fields of electric power engineering and modern electric engineering, and is an indispensable and important equipment for electrical engineering.

There are three types of traditional dry-type air-core current-limiting reactors. One is to use concrete to pour the wound reactor coil into a solid whole called a cement reactor. This cement current-limiting reactor is large in size, heavy in weight, and too cumbersome. Second, it is called a wrapping reactor wound with variable wire diameter (small wire diameter) aluminum wire. The aluminum wire of this current-limiting reactor is easy to oxidize, has poor mechanical strength and low service life. Third, use a pressure plate and a pull rod to tighten the wound reactor coil, which is called a clamping reactor. This kind of current-limiting reactor has poor moisture-proof performance and large additional losses. The above three reactors cannot achieve the best effect in the power system.

Contents of Invention

In order to solve the deficiencies of the prior art, the present invention provides a 35 kV three-phase dry-type air-core current-limiting reactor, which adopts a new structure, has low loss, high mechanical strength, large short-circuit limiting current, and high insulation level to the ground , Strong protection ability, easy to use.

To achieve the above object, the present invention adopts the following technical solutions:

The 35 kV three-phase dry-type air-core current-limiting reactor includes a coil, an insulating cylinder, and an upper and lower supporting plate. The outside of the wire is covered with an insulating layer, and each layer of coil is coated with an epoxy resin curing agent; between each layer of coils, there is an F-level insulating cold-drawn air duct strip, and the upper and lower ends are provided with end insulation, and the thickness of the end insulation is the same as The diameters of the wires are the same; pass through the air duct strip and the end insulation through the insulation threading strip, and rivet the air duct strip to the end insulation and the supporting plate.

The insulation cylinder adopts the molded epoxy glass fiber cloth cylinder, and its single side thickness is δ=3mm.

The outer insulating layer of the copper stranded wire is made of polyvinyl chloride, and its thickness on one side is δ=3mm.

The air duct strip is provided with a ventilation ditch.

End insulation adopts epoxy glass fiber cloth board formed by thermocompression.

The pallet is made of non-magnetic steel pallet.

The outer layer of the reactor coil is bound with multi-layer mesh glass wire without weft tape.

The upper part of the reactor coil is provided with a rainproof plate.

The bottom of the reactor coil is supported by multiple porcelain insulators.

The beneficial effects of the present invention are:

1) Multiple copper stranded wires are used as the conductor of the coil, the purpose of which is to prevent the air-core reactor from generating a strong electric field when it operates under high current and high voltage, so that the skin effect occurs on the wire of the coil, thereby reducing the additional loss of the air-core current-limiting reactor , to achieve the purpose of energy saving, the copper stranded wire insulation withstand voltage is more than 3000 volts/layer.

2) The coil of the reactor is directly wound on the formed epoxy glass fiber cloth drum. Each layer of coil is equipped with F-insulated cold-drawn smooth air duct, so that the coil air is smooth, the two sides of the wire dissipate heat, there is no ventilation dead angle, and the reactor coil is greatly improved. Excellent heat dissipation capacity, so that the current density of the reactor wire reaches Δ=2.5a/ ^mm2 or more, and the temperature rise of the coil does not exceed 65°C.

3) For the reactor coil, the end of each layer is provided with end insulation of hot-pressed epoxy glass cloth board, the thickness of the end insulation is the same as the diameter of the wire, and the density reaches 50mm. Especially during the winding process, both sides of the air duct strips are riveted on the end insulation with insulating strips, so that each layer of wires is firmly pressed under the air duct strips, and each layer of coil wires is coated with epoxy resin Curing agent, so that each layer of wires is firmly bonded together. Thus greatly improving the ability of the air-core current-limiting reactor to resist short-circuit current, even if the reactor coil is short-circuited at 25 times the rated current, the electromotive force generated by the short-circuit current will not cause the coil wire of the air-core current-limiting reactor to displace and cause damage.

4) The outer layer of the reactor is wound with multi-layer mesh glass wire without weft tape, and the wires of the coil are bound up strongly. The coil of the current-limiting reactor is dried in vacuum, and the vacuum pressure impregnates the paint so that the wires of the reactor and the insulating parts are firmly bonded together. , The outer surface of the coil is coated with an anti-ultraviolet, moisture-proof, and anti-brittle curing agent.

5) The bottom of the reactor coil is supported by multiple porcelain insulators, and the bending stress of the porcelain insulators reaches 10 kN. The reactor coil, porcelain insulator and rainproof plate are reasonably connected together, so that the reactor becomes a solid whole, and the ground insulation level and stability of the current-limiting reactor are greatly improved.

To sum up, the present invention has the advantages of simple and reasonable structure, strong ability to resist short-circuit current, good electrical performance, small volume, light weight, small loss and low noise.

Description of drawings

Figure 1 is a schematic diagram of the structure of a 35 kV dry-type air-core current-limiting reactor.

Figure 2 is a combined diagram of a 35 kV three-phase dry-type air-core current-limiting reactor.

Detailed ways

As shown in Figure 1, a 35 kV three-phase dry-type air-core current-limiting reactor includes a coil, an epoxy glass cloth drum 5, and an upper and lower non-magnetic steel support plate 8. The coil of the reactor is a copper strand composed of multiple thin copper wires 2 Wound on the epoxy glass fiber cloth tube 5, the thickness of the epoxy glass fiber cloth tube is δ=3mm on one side. Copper stranded wire 2 is covered with high temperature resistant, corrosion resistant, waterproof and moisture proof polyvinyl chloride insulation layer, each layer of coil is coated with epoxy resin curing agent 6; between each layer of coils, there is an F-class insulation cold drawn Air duct strip 3, the air duct strip is provided with ventilation grooves to make the coil air flow smoothly and there is no ventilation dead angle.

The upper and lower ends of the coil are equipped with end insulation 1 of epoxy glass fiber cloth plate formed by hot pressing, and the thickness of the end insulation is the same as the diameter of the wire; the insulation thread 4 passes through the air duct strip 3 and the end insulation 1, and the air duct strip 3 is riveted on the End insulation 1 and non-magnetic steel supporting plate 8. The outer layer of the reactor coil is bound with multi-layer reticulated glass fiber latitude-free tape 7 to bind the wires of the coil; the upper part of the reactor coil is provided with a rainproof plate 10; the bottom of the reactor coil is supported by multiple porcelain insulators 9, The magnetic steel supporting plate 8 rationally connects the coil, the porcelain insulator 9 and the rainproof plate 10, so that the reactor becomes a firm whole.

Claims (9)

1,35 kv 3-phase dry type hollow current-limiting reactors, comprise coil, insulating cylinder, supporting plate up and down, it is characterized in that: the copper stranded conductor that the coil of reactor adopts many fine copper wires to form is wound on the insulating cylinder, and the copper stranded conductor outside is surrounded by insulating barrier, and every layer line circle outside all scribbles epoxy curing agent; Be provided with F class F insulation cold-drawn air channel bar between every layer line circle, its upper and lower end parts is provided with the end insulation, and the end insulation thickness is identical with diameter of wire; Wearing bar by insulation passes air channel bar and end insulation, air channel bar riveting is being held on insulation and the supporting plate.

2,35 kv 3-phase dry type hollow current-limiting reactors according to claim 1 is characterized in that: insulating cylinder adopts moulding epoxy fibreglass cloth tube, and its monolateral thickness is δ=3mm.

3,35 kv 3-phase dry type hollow current-limiting reactors according to claim 1 is characterized in that: the insulating barrier of copper stranded conductor outside adopts polyvinyl chloride, and its monolateral thickness is δ=3mm.

4,35 kv 3-phase dry type hollow current-limiting reactors according to claim 1, it is characterized in that: the air channel bar is provided with ventilation ducts.

5,35 kv 3-phase dry type hollow current-limiting reactors according to claim 1 is characterized in that: hot-forming expoxy glass silk fabric board is adopted in the end insulation.

6,35 kv 3-phase dry type hollow current-limiting reactors according to claim 1 is characterized in that: supporting plate adopts the nonmagnetic steel supporting plate.

7,35 kv 3-phase dry type hollow current-limiting reactors according to claim 1 is characterized in that: the outer netted glass fiber of multilayer that adopts of reactor winding does not have the binding of latitude band.

8,35 kv 3-phase dry type hollow current-limiting reactors according to claim 1, it is characterized in that: reactor winding top is provided with flashing board.

9,35 kv 3-phase dry type hollow current-limiting reactors according to claim 1 is characterized in that: the reactor winding bottom is supported with a plurality of porcelain insulators.

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