Dry-type transformer capable of reducing noise

Abstract

The invention discloses a dry-type transformer capable of reducing noise. The dry-type transformer comprises a clamping piece and an iron core, the iron core is formed by stacking and combining silicon steel sheets, and the dry-type transformer is characterized in that an upper noise reduction layer is arranged on the periphery of a side yoke on the upper portion of the iron core and wraps a joint at the side yoke on the upper portion of the iron core; the transformer has the advantages that the side yoke of the iron core is coated with epoxy resin, part of vibration energy loss is changed into heat energy, and the vibration of the silicon steel sheets is reduced, so that the noise generated by the iron core is reduced, the purposes of damping, vibration attenuation and noise reduction are achieved, the noise reduction effect is obvious, and the cost is lower; and in addition, a screw reinforced iron core and a clamping piece are added, and noise generated by natural vibration when the iron core works is prevented.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a noise-reducing dry-type transformer. Background technique [0002] With the rapid advancement of my country's power transmission and transformation projects represented by UHV, substations have developed rapidly as relay stations for power transmission. The continuous expansion of urban scale in recent years has made many substations close to environmentally sensitive areas such as residential areas, schools, and hospitals. The noise of substations has had a certain impact on the work and life of surrounding residents. [0003] The main source of noise in the transformer iron core is that the silicon steel sheet constituting the iron core will undergo magnetostriction under the action of an alternating magnetic field. Magnetostriction makes the iron core vibrate periodically with the change of excitation frequency to generate noise. There is electromagnetic attraction bet...

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Problems solved by technology

[0003] The main source of noise in the transformer iron core is that the silicon steel sheet constituting the iron core will undergo magnetostriction under the action of an alternating magnetic field. Magnetostriction makes the iron core vibrate periodically with the change of excitation frequency to generate noise. There is electromagnetic attraction between the joints of the transformer and the layers of the silicon steel sheet due to magnetic flux leakage, which causes the vibration of the iron core to generate noise. Now some will install a noise reduction device outside the transformer, but this method can achieve the noise reduction effect. Inconspicuous and expensive

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