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Dry-type electric transformer

A power transformer, dry-type technology, applied in transformer/inductor components, transformer/inductor coils/windings/connections, circuits, etc. Discharge and other issues to achieve the effect of reducing current density, saving resources, and reducing consumption

Pending Publication Date: 2016-07-13
龚柱
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And increasing the overlap length will increase the amount of busbars, thereby increasing the manufacturing cost
The bolts used for fastening will reduce the electrical clearance or safety distance between conductive parts and non-conductive parts. Large spacing will inevitably cause the transformer to take up more space
How to increase the contact area so that the temperature rise of the connection is low without reducing the electrical gap and without increasing the space occupied by the transformer

Method used

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  • Dry-type electric transformer
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Examples

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Embodiment 2

[0066] The material of the first columnar portion 1 in the first embodiment is changed to copper alloy, and the material of the second columnar portion 2 is changed to aluminum alloy. Since the hardness of the alloy is relatively high, the second columnar portion 2 can be placed in a low temperature environment ( Stored at 5°C for a period of time (5 minutes), while the first columnar part 1 is stored for a period of time (5 minutes) in a high temperature environment (80°C). With the help of thermal expansion and contraction, the inner diameter of the first columnar part 1 Slightly larger, and the outer diameter of the first columnar portion 1 is slightly smaller, so that the second columnar portion 2 can be easily assembled into the first columnar portion 1. After the assembled connecting column returns to normal temperature, the first columnar portion 1 The interference fit can be achieved with the second columnar portion 2. The diameter and length of the connecting column di...

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Abstract

The invention discloses a dry-type electric transformer and belongs to the field of power equipment.A connecting column is arranged at the low-voltage output end of the dry-type electric transformer, part of the connecting column is embedded into the low-voltage output end and is in interference fit with the low-voltage output end, the connecting column is provided with a first conductive columnar part in interference fit with a power busbar, a second conductive columnar part is coaxially arranged in the first columnar part, the first columnar part and the second columnar part are in interference fit, and the thermal coefficient of expansion of the second columnar part is larger than that of the first columnar part.The transformer has the advantages that a larger conductive area is generated by the same lap joint length, then the current density is reduced, and low temperature rise of the low-voltage output end is achieved; the use number of busbars is reduced, and resources are saved; the electrical clearance or the safe distance is increased, and the electrical safety of the equipment is improved.

Description

Technical field [0001] The invention relates to the field of power equipment, in particular to a dry-type power transformer. Background technique [0002] In the power distribution room of the factory, the low-voltage output end of the dry-type transformer is usually directly connected by the power bus bar, and the power bus bar is directly connected to the low-voltage output end. The low-voltage output end and the power bus bar are usually connected by overlapping overlap. Then tighten with bolts. Such as Figure 7 In the upper half of the connection method, the busbar and the output end need to be overlapped by a certain length to maintain the current density of the contact surface within a certain range, so that the temperature rise at the connection meets the relevant standards. In order to reduce the temperature rise of the connection, it is usually necessary to increase the length of the overlap between the busbar and the terminal to increase the contact area, thereby reduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/29
CPCH01F27/292H01F27/29H01F27/28H01R4/58H02G5/007
Inventor 龚柱
Owner 龚柱
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