CN210606920U - High-voltage dry-type air reactor - Google Patents

Abstract

The utility model discloses a high-pressure dry-type air-core reactor, including at least one winding between last busbar and the lower busbar, the winding is the multilayer coil winding that is formed by one or many round wires according to the helix along axial stromatolite coiling, and each layer coil is parallelly connected to be welded on the corresponding position of upper and lower busbar, leaves the gap for sparse arrangement between the upper end of each layer coil and the lower tip several circles so that the packing of the glass fiber who is presoaked with epoxy, closely arranges between the other each circle of each layer coil; and (3) corresponding to the joint welding position of the winding, wrapping the bus bar with an insulating material pre-soaked with epoxy resin to form an insulating layer, and curing and molding the insulating layer at high temperature. The utility model discloses can effectively improve the dielectric strength of reactor.

Description

High-voltage dry-type air reactor

Technical Field

The utility model relates to a power equipment specifically is a high pressure dry-type air-core reactor.

Background

The high-voltage dry-type air-core reactor is a common power device of a power system and is widely applied to various occasions such as reactive compensation, filtering, current limiting and the like. The high-voltage dry-type air reactor mainly comprises a winding, a bus bar, a post insulator and a mounting base.

Because the operating overvoltage which is higher than the voltage generated by the reactor in the normal switching process is unevenly distributed on the reactor, the potential gradient between the turns of the head end part and the tail end part is higher, and the instantaneous voltage is applied to the first turns of the reactor winding, the requirement on the turns of the head end part and the tail end part is higher, and the turn-to-turn insulation breakdown is easily caused by the long-time accumulation of the electric erosion effect generated by the frequent switching of the reactor.

The high-voltage dry-type air reactor runs in an outdoor environment and suffers from the action of light irradiation, moisture, cold-heat conversion and electromagnetic field all the year round, the encapsulated epoxy resin is easy to age, the mechanical strength and the electrical strength of the epoxy resin are greatly reduced, and the phenomenon of encapsulation cracking is easy to occur in the cold-heat conversion environment; further, a dendritic creepage phenomenon occurs, and most of the dendritic creepage occurs in a region where the end surface of the reactor contacts the bus bar.

These are all hidden dangers affecting the safe operation of the high-voltage dry-type air-core reactor.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model aims to solve the technical problem that a high pressure dry-type air-core reactor of effective improvement dielectric strength is proposed.

The technical scheme of the high-voltage dry-type air reactor comprises at least one winding between an upper bus bar and a lower bus bar, wherein the winding is a multilayer coil winding formed by winding one or more round wires in a laminated manner along the axial direction according to a spiral line, each layer of coil is welded on the corresponding position of the upper bus bar and the lower bus bar in parallel, the difference is that a plurality of turns at the upper end part and the lower end part of each layer of coil are arranged sparsely to leave gaps so as to facilitate the filling of glass fiber pre-impregnated with epoxy resin, and the rest turns of each layer of coil are arranged closely; and (3) corresponding to the joint welding position of the winding, wrapping the bus bar with an insulating material pre-soaked with epoxy resin to form an insulating layer, and curing and molding the insulating layer at high temperature.

Conventionally, the conducting wire is a copper wire or an aluminum wire.

Conventionally, the bus bar is made of an aluminum plate or a copper plate.

The utility model has the advantages that:

1. the utility model discloses high-pressure dry-type air-core reactor is through the arrangement that changes each layer coil wire, can strengthen the interturn insulation of the upper end of reactor and a plurality of circles wire of tip down, has improved the shock resistance of wire.

2. The utility model discloses a wrap up and form the insulating layer with the insulating material who soaks epoxy on the busbar, have good electrical insulation performance, can avoid the dendritic discharge between winding overhang surface and the busbar effectively.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a bus bar in the embodiment of fig. 1.

Fig. 3 shows the wire arrangement of the windings in the embodiment of fig. 1.

And (3) identifying the figure number: 1. an upper bus bar; 2. a lower bus bar; 3. a winding; 4. a wire; 5. an insulating layer; 6. a post insulator; 7. a base.

Detailed Description

The technical solution of the present invention will be further explained with reference to the embodiments shown in the drawings.

The utility model discloses high-pressure dry-type air-core reactor, including setting up at last busbar 1 (including the row body of the radial equipartition of circumference, each row body all adopts aluminum plate or copper preparation) and busbar 2 (including the row body of the radial equipartition of circumference, each row body all adopts aluminum plate or copper preparation) down between at least one multilayer coil winding 3 (annular form), each row body in the busbar 2 corresponds to install on the post insulator 6 that corresponds separately down, and each post insulator 6 is installed on the base 7 that corresponds the setting, as shown in figure 1, figure 2.

The multilayer coil winding 3 (also called multilayer cylinder winding in the industry) is formed by axially laminating and winding one or more round wires 4 (copper wires or aluminum wires) according to a spiral line, one round wire 4 is correspondingly wound with one coil, the round wires 4 are correspondingly wound with a plurality of coils of component layers, the coils of each layer are welded on the corresponding positions of the upper and lower busbars 1 and 2 in parallel, the upper end of each layer of coil is welded on the corresponding position of the upper bus bar 1, the lower end of each layer of coil is welded on the corresponding position of the lower bus bar 2, a plurality of turns of conducting wire of the upper end part and the lower end part of each layer of coil are arranged sparsely to leave a gap with a certain width, the gap facilitates the filling of glass fibers pre-impregnated with epoxy resin as reinforcement of the inter-turn insulation, with the remaining turns of each layer of coil being in conventional close alignment, as shown in fig. 3.

And (3) corresponding to the joint welding position of the winding 3, wrapping the bodies of the upper and lower busbars 1 and 2 by using an insulating material pre-impregnated with epoxy resin to form an insulating layer 5 with a certain length and thickness, and curing and molding the insulating layer 5 at a high temperature to avoid the creepage along the dendritic surface between the surface of the winding 3 and the busbars, as shown in fig. 1 and 2.

The wrapping length of the insulating layer 5 is determined according to the thickness (radial direction) of the winding 3, the insulating layer wraps from the inner radius of the winding to the tail end of the bus bar outwards along the radial direction, and the whole wrapping part and the end part of the tail end need to wrap a compact part without metal exposure (for the bus bar for wiring, a wiring part needs to be reserved, and the end part does not wrap).

The wrapping thickness of the insulating layer 5 is 1-2 mm.

Claims (3)

1. High-pressure dry-type air-core reactor, including last busbar (1) and at least one winding (3) between busbar (2) down, winding (3) are the multilayer coil winding that forms according to axial stromatolite coiling by one or more round wire (4), and each layer coil parallel welding is on the corresponding position of upper and lower busbar (1, 2), its characterized in that: a plurality of turns of the upper end part and the lower end part of each layer of coil are arranged sparsely to leave gaps so as to be convenient for filling glass fibers pre-impregnated with epoxy resin, and the rest turns of each layer of coil are arranged closely; and (3) corresponding to the joint welding position of the winding (3), wrapping the bus bar with an insulating material pre-soaked with epoxy resin to form an insulating layer (5), and curing and molding the insulating layer (5) at high temperature.

2. A high-voltage dry-type air-core reactor according to claim 1, characterized in that: the lead (4) is a copper wire or an aluminum wire.

3. A high-voltage dry-type air-core reactor according to claim 1, characterized in that: the upper and lower bus bars (1, 2) are made of aluminum plates or copper plates.

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