How to Control Dry Type Transformer's Noise Caused by Design Parameters & Manufacturing Processes? - Ningbo Wanji Electronics Science & Technology Co., Ltd.

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How to Control Dry Type Transformer's Noise Caused by Design Parameters & Manufacturing Processes?

Dry type transformer noise mainly originates in the core, the design of the core diameter and flux density to take the size of the density has a direct impact of dry type transformer's noise. Derived from the experimental data curve we can be seen, noise and magnetic flux density and core size are directly proportional. In general, the magnetic flux density for each additional 0. 1T, the noise will increase the transformer 2 ~ 3dB (A), therefore, we should be minimize the magnetic flux density when design. Dry type transformer's flux density is generally take about 1.6T.

In addition, the core manufacturing process have a greater impact on the noise of dry type transformer. If the silicon steel burr increases, the transformer noise will be increased significantly. There are also the problem of core fastening, now many dry type transformer core using epoxy resin instead of lashing, this method can reduce the noise 2dB (A) or so. However, if the resin coating is not good, or poor quality of the resin and resin loss caused by improper deployment of proportion, it will increase the transformer noise of dry type transformer. Therefore, many manufacturers ntroduction of resin curing and then additional binding, so dry type transformer’s reliability has been greatly improved, the noise is generally more stable.

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