CN201348887Y - Heat shrinkable polyester fiber grid coated transposed conductor - Google Patents

Abstract

The utility model relates to a heat-shrinkable polyester fiber grid-coated transposition wire, in particular to a novel winding wire structure for a power transformer, which belongs to the technical field of coil winding wires. The feature is that the acetal paint layer and the epoxy self-adhesive paint layer are sequentially coated on the oxygen-free copper flat wire conductor to form a single flat wire after curing, and an odd number of single flat wires are arranged in two rows, and all the single flat wires After transposition in turn to form a whole bundle of wire cores, the polyester fiber mesh tape layer is wound outside the whole bundle of wire cores, the glass fiber rope is placed on the side of the polyester fiber mesh tape layer, and then wrapped with a high-density paper layer. The utility model has a compact and reasonable design structure, which reduces the volume of the transformer; solves the defect that the heat exchange and structural strength of the transposition wire cannot be satisfied at the same time. After testing, compared with the ordinary winding of the transformer, heat shrinkable polyester fiber net is used. The average temperature gradient of the grid-coated transposed conductor is reduced by 1/4, the bending strength is increased by more than 3 times, and the deformation is greatly reduced when subjected to short-circuit impact.

Description

Heat-shrinkable polyester fiber mesh-coated transposed wire

technical field

The utility model relates to a heat-shrinkable polyester fiber grid-coated transposition wire, in particular to a novel winding wire structure for a power transformer, which belongs to the technical field of coil winding wires.

Background technique

In the prior art, there are generally two ways to transpose the wire. One is to use insulating paper to wrap the core of the transposed wire. This structure tends to retain the transformer oil between the winding wires, and the insulating paper is easily heated. Deformation, blocking the oil passage, resulting in reduced heat exchange efficiency; the second is to use epoxy resin glass fiber rope to bind the transposition core, although this structure has better heat dissipation efficiency, but due to the epoxy resin glass fiber rope It does not have heat shrinkability, so there is the disadvantage that the transposed wire is difficult to hold tightly during the secondary curing process after the coil is formed, and due to the limited binding area, the mechanical strength of the transposed wire structure is not high. The service life of the transposed conductors of these two structures will be greatly reduced due to the high temperature and electromagnetic force generated by the impact of the short-circuit current during the use of the transformer.

Contents of the invention

The purpose of this utility model is to overcome the above disadvantages, thereby providing a heat-shrinkable polyester fiber grid-coated transposition wire, which can reduce the volume of the transformer, greatly improve the mechanical strength, and directly combine with the transformer oil in the transformer. Contact, smooth oil passage, stable heat dissipation and high efficiency.

According to the technical scheme provided by the utility model, the heat-shrinkable polyester fiber grid-coated transposition wire includes: an oxygen-free copper flat wire conductor, which is characterized in that the oxygen-free copper flat wire conductor is coated with an acetal paint layer, epoxy self- After the paint layer is cured, a single flat wire is formed, and an odd number of single flat wires are arranged in two rows. All the single flat wires are transposed in turn to form a whole bundle of wire cores, and the polyester fiber mesh tape layer is wound on the whole bundle. Outside the bundle core, the glass fiber rope is placed on the side of the polyester fiber mesh belt layer, and then wrapped with a high-density paper layer.

Compared with the prior art, the utility model has the following advantages:

The utility model has a compact and reasonable design structure, which reduces the volume of the transformer; solves the defect that the heat exchange and structural strength of the transposition wire cannot be satisfied at the same time. After testing, compared with the ordinary winding of the transformer, heat shrinkable polyester fiber net is used. The average temperature gradient of the grid-coated transposed conductor is reduced by 1/4, the bending strength is increased by more than 3 times, and the deformation is greatly reduced when subjected to short-circuit impact.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

Below the utility model will be further described in conjunction with the embodiment in the accompanying drawing:

As shown in Figure 1, it includes: an oxygen-free copper flat wire conductor 1, an acetal paint layer 2, an epoxy self-adhesive paint layer 3, a polyester fiber mesh tape layer 4, a glass fiber rope tape 5, and a high-density paper layer 6.

The oxygen-free copper flat wire conductor 1 of the utility model is coated with an acetal paint layer 2 by enamelling equipment and then coated with an epoxy self-adhesive paint layer 3 after curing. The single flat wire formed after curing is composed of an odd number of single flat wires. The wires are arranged in two rows, and the whole bundle of wire cores is formed after a plurality of single flat wires are transposed one by one through the transposition device within the preset pitch, and the polyester fiber mesh belt layer 4 is wound with the wrapping equipment. The fiber rope belt 5 is placed on the side of the polyester fiber mesh belt layer 4, and then wrapped with a high-density paper layer 6. After being compacted by a traction device, it is wound on an upper coil to form a heat-shrinkable polyester fiber mesh-coated transposition wire.

The utility model can adjust the winding angle according to the transposition specification and the number of wires, and use the heat-shrinkable polyester mesh belt to tightly wrap the transposition wire core. The hot-melt penetration of the adhesive paint layer into the polyester fiber mesh, the polyester fiber mesh belt shrinks greatly in the radial direction, fills the space of the hot-melt penetration of the epoxy self-adhesive paint, and tightly wraps the transposition wire core. The mechanical strength of the transposed wire is greatly improved, and because of the non-sealed insulating paper tape barrier, the transposed wire directly contacts the transformer oil in the transformer, the oil passage is smooth, and the heat dissipation is stable and efficient. In the process of moving and transportation, the glass fiber rope 5 and high-density paper layer 6 added to prevent pollution and damage are used in the winding of the transformer, and only one end of the glass fiber rope 5 can be pulled during the winding process to remove the protective wire. The high-density paper layer 6 is removed.

Claims (1)

1, a kind of thermal polycondensation ester fiber grid cladded type transposed conductor, comprise oxygen-free copper lenticular wire conductor (1), it is characterized in that: on oxygen-free copper lenticular wire conductor (1), apply acetal enamelled coating (2), the single lenticular wire of epoxy self-bonding enamelled coating (3) curing back formation successively, be arranged in two row by the single lenticular wire of odd number root, through forming whole bunch core after the transposition successively, polyester fiber guipure layer (4) is wrapped in outside the whole bunch core, glass rope band (5) is placed on polyester fiber guipure layer (4) side, wrapped again high density ply of paper (6).