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Smit - The Power Of Manufacturing

Other manufacturers are also noticing the trend. The question is a simple one. How do you manufacture transformers that make less noise without fundamentally modifying the design? Many transformers from Royal SMIT Transformers B.V. find their way to New York and Washington, where this task has long been an issue. But the European market too is seeing increasing demand for low-noise transformers. Noise reduction There are various solutions for reducing transformer noise. The choice depends on the degree of noise reduction needed and the requirements and wishes of the end user. Solutions include both passive and active measures. Passive measures, increasing in reduction value, include integrated panels, coupled walls and freestanding insulated housing units. Insulated housing units take up more room, but also have a greater effect. But sometimes there simply isn’t enough room for such external solutions. In the example of New York, where installations have to be as compact as possible, a manufacturer has to look at other options for reducing noise. And that inevitably leads to a low-noise design. Reducing core induction noise is an option, as is reducing the noise from the windings. There have been various new developments in recent years. Under the name ‘Active Noise Control’ (ANC), troublesome sound waves are counteracted by inserting negative sound waves. In 2014, a pilot was initiated in a transformer station: an important development with promising results, according to Stef Zoeteman of Merford Noise Control. “This is the future. It’s an issue that has attracted a great deal of attention. ANC is fast becoming a valid complement to existing solutions. Incidentally, the technology behind ANC has been around since the 1930s, but has only been used in practice for the past few years or so. Thanks to the monotone and low-frequency sound that transformers emit, this application is very suitable for active noise control. The noise isn't completely eliminated, but we are now better able to manage the peaks. After all, it's the peak moments in the frequency spectrum that cause the most problems. It's just a question of time before active noise control becomes the standard measure for managing the noise emitted from transformers.” When transformers have to whisper... 13 FEATURED | LAWS AND RULES Active noise control


Smit - The Power Of Manufacturing
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