SanerVib noise and vibration suppressor pad for electrical transformer

SanerVib noise reduction solutions for electrical transformers are made up of different anti-vibration pads and low frequency silentblocks specially designed to soundproof transformers, isolating vibrations up to 99%.

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Problems of vibrations and noise levels of transformers:

When the oil filled electrical transformers or dry type cast resin transformers are in operation, they emit a characteristic noise resulting from the vibrations of the magnetic sheets (magneto constriction) that they contain. This vibration comes from the alternating current in 50 Hz which pass through them, characterizing a fundamental vibration frequency of 100 Hz and several harmonics of corresponding vibrations.

Depending on the electrical load used, the design and the age of the transformer, these vibrations may increase over time. In addition, depending on the installation location (parking lot, basement of the building, roof, etc.) these vibrations can resonate with the frame and the building.

SanerVib® solution to reduce transformer noise:

In order to dampen the vibrations generated by each electrical transformer, we have designed the SanerVib® range: composed of several low frequency silentblocks specially developed to provide high antivibration efficiency at the excitation frequencies of the transformers, depending on their weight and attenuation required :

- 80% for the SanerVib80 ™ series,

- and up to 99% for the SanerVib99 ™ series.

The SanerVib80 ™ silentblocs consist of a stainless steel cushion encapsulated between a metallic plate and a support for the transformer wheel.

SanerVib99 ™ silent blocks are made up of one or more cores with a high-strength metal spring and a stainless steel fiber cushion at its heart.

Why using metallic vibration dampers for electrical transformers?

The solutions usually used are plastic or elastomer materials very subject to temperature variations and which see their damping coefficient decrease over time. Which therefore need to be changed regularly. Conversely, for the manufacture of our SanerVib® accessories, we have chosen metals whose elasticity module varies very little over time and depending on the temperature, hence have a constant absorption performance; the SanerVib® surface treatment has also been reinforced so that their aging is close to the life of the transformer.

Depending on the weight of the transformer, SanerVib® solutions require 1 or even 2 or 3 cores to perform their function. In addition, they are available in different configurations: simple to screw on, with support and fixing base or protected in a box with support for the transformer wheel.

Design of the SanerVib® range

All SanerVib® silent blocks are designed to isolate the vibrations generated by the magneto-constriction of the transformers, and in particular the fundamental excitation frequency of 50 Hz as well as the harmonics of 100 Hz and 200 Hz.

To meet these requirements, the SanerVib® have been tested in the SilentFlex® laboratories in order to visualize the variation of the resonant frequency as a function of the load supported. For their application in the field of electrical transformers, this data is essential to recommend the right equipment.

Our charts allow to isolate for each of the excitation frequencies of the transformer at 50Hz, 100Hz and 200Hz, the natural frequency of the suspension (chart opposite) and for a desired attenuation, to define the maximum admissible load, without reaching the yield strength of the materials used.

The strong absorption of the vibrations emitted by the transformer then allows their quasi-disappearance and thus prevents their propagation; annoying structural noises from the transformer are no longer transmitted in homes or via the technical ducts of buildings and offices.

This is why we advise you to isolate the supports of your electrical transformers by the SanerVib® anti-vibration pads which are efficient, robust, reliable, tested in independent laboratories with third party and economic.

For other support loads, wheel dimensions, other types of base, please contact our sales department. The SanerVib® are available in different configurations: simple to screw, with support and fixing base or protected in a box with support for the transformer wheel. A cable version fits on the transformer connections to further limit the propagation of vibrations.

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