Resin casting coil dry-type transformer structure and assembling method thereof

Abstract

The invention relates to a resin casting coil dry-type transformer structure and an assembling method thereof. The resin casting coil dry-type transformer structure comprises a transformer body arranged on a base, wherein the transformer body comprises an iron core, an upper clamping part, a lower clamping part and high-voltage and low-voltage resin coils; the low-voltage resin coil and the high-voltage resin coil sleeve the external circumference of a core column of the iron core respectively; the bottoms of the high-voltage and low-voltage resin coils are mounted on a cushion block and an embedding part of the lower clamping part by piers; a pressing block, an embedding part and a pressing plate are arranged at the top of the high-voltage and low-voltage resin coils and the pressing plate is tightly pressed by rotating a pressing stud through an upper clamping part screw hole, so that the high-voltage and low-voltage resin coils are tightly pressed and fixed; pull plates are arranged on the two sides of the core column of the iron core; and the upper and lower ends of the pull plates are fixedly connected with the upper clamping part and the lower clamping part through pins respectively. With the adoption of the dry-type transformer structure provided by the invention, the stability of the iron core and the coils is enhanced and a displacement phenomenon of the high-voltage and low-voltage resin coils in a transportation process of a transformer can be avoided. The creeping distance is increased through a pressing block reinforcing rib and a partial discharging condition is reduced; and the properties of the transformer are effectively improved.

Description

technical field [0001] The invention relates to a resin casting coil dry-type transformer structure and an assembly method thereof, belonging to the technical field of transformers. Background technique [0002] At present, the dry-type transformer structure usually consists of three high-voltage and low-voltage resin casting coils set on the iron core column, the lower yoke of the iron core is placed on the supporting channel steel, and the four fastening screws of the lower clamp are used to fix and clamp the lower iron core. For the yoke, 3X4 lower pads and inserts are placed on the lower clamp, and the high and low voltage resin casting coils are placed on the lower pads and inserts. The lower clamp and the upper clamp pass through the three pull plates on both sides of the iron core and The pull plate and the lower pin are connected, the upper clamp has 4 lifting rings, the lifting weight of the whole transformer is borne by 6 pull plates, the upper clamp is fixed and c...

AI Technical Summary

Problems solved by technology

The main reasons are: (1) After the dry-type transformer is loaded, unloaded and transported, the high and low voltage resin coils are displaced, and the instantaneous displacement causes a huge pulling or squeezing force, resulting in the above problems

(2) This kind of displacement can also easily cause the relative spacing between the high and low voltage resin coils and the iron core to change, and a short leakage path will appear, which will cause short circuit discharge between the high and low voltage resin coils, and burn out the transformer; (3) This displacement It is also easy to cause the iron core to loosen, resulting in insufficient magnetic cross-section, causing vibration noise and temperature rise, which in turn damages the insulation and reduces the service life of the transformer

[0004] The main reason for the above problems is that the structural design of the existing dry-type transformers is insufficient, mainly in the following points: First, the drawing plate is generally made of steel plate or stainless steel plate, because the drawing plate is long and the intermediate strength is not enough, resulting in the clamping of the iron core. Insufficient tightening force is prone to loose iron core, resulting in large mechanical noise; second, the briquetting block is generally molded by DMC or BMC, and its shape is generally a cuboid, and the creepage path is short, which is easy to cause partial discharge, and its strength is not good; Nails are generally pressed directly on the pressing block, and the force point is only one point, which cannot ensure that the pressure on the pressing block is uniform, which in turn affects the position of the high and low pressure resin coils.

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