Oil-immersed power transformer

Abstract

The invention discloses an oil-immersed power transformer, belongs to the field of power equipment and particularly relates to the oil-immersed power transformer. A coupling column is arranged at a low-voltage output end of the oil-immersed power transformer; the coupling column is partially embedded into the low-voltage output end and is in interference fit with the low-voltage output end; the coupling column is provided with a conducting first columnar part in interference fit with a power bus; a second columnar part with conductivity is coaxially arranged in the first columnar part; the first columnar part and the second columnar part are in interference fit; and the thermal expansion coefficient of the second columnar part is greater than that of the first columnar part. The transformer disclosed by the invention has the beneficial effects that (1) more conducting area is generated by the same overlapping length, so that the current density is reduced and a low temperature rise of the low-voltage output end is achieved; (2) the usage amount of the bus is reduced and resources are saved; and (3) the electric clearance or the safety distance is increased and the electric safety of equipment is improved.

Description

technical field [0001] The invention relates to the field of electric equipment, in particular to an oil-immersed power transformer. Background technique [0002] In the power distribution room of the factory, the low-voltage output end of the oil-immersed transformer is usually directly connected with the power busbar, and the power busbar is directly connected to the low-voltage output end. The connection between the low-voltage output end and the power busbar is usually overlapped. Then tighten with bolts. Such as Figure 8 In the upper half of the upper section, this connection method needs to overlap the busbar and the output end by a certain length, so that the current density of the contact surface can be maintained within a certain range, so that the temperature rise at the connection can meet the relevant standards. In order to reduce the temperature rise at the joint, it is usually necessary to increase the overlapping length of the busbar and the terminal to incr...

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

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