Sanervib

SANERVIB is the SANERGRID Group brand dedicated to noise reduction solutions for electrical transformers.

When oil-filled or dry-type electric transformers are in operation, they emit a characteristic noise due to the vibration of the laminations (magnetic constriction) they contain. This vibration is caused by the 50 Hz alternating current that flows through them, with a fundamental vibration frequency of 100 Hz and several corresponding vibration harmonics.

Depending on the electrical load used, and the design and age of the transformer, these vibrations can increase over time. In addition, depending on the installation site (car park, basement of a building, roof, etc.), these vibrations may enter into resonance with the building.

To dampen the vibrations generated by each electrical transformer, we have designed the SanerVib^® range: several low-frequency silentblocks specially developed to offer high anti-vibration performance at the excitation frequencies of transformers, depending on their weight and the damping required:

• 80% for the SanerVib80™ series consisting of a stainless steel cushion encapsulated between a mounting plate and a transformer wheel support.
• Up to 99% for the SanerVib99™ series consisting of one or more cores with a high-strength metal spring and a stainless steel fibre cushion at its core.

The choice of materials: SANERGRID^® know-how.

The solutions usually used are made of plastic or elastomer, materials that are highly sensitive to temperature variations and whose damping coefficient decreases over time, so they need to be changed regularly. Furthermore, in the event of a transformer fire, they generally generate toxic or carcinogenic fumes.

For the manufacture of our SanerVib^® accessories, we have chosen metals whose modulus of elasticity varies very little over time and as a function of temperature, which means that their absorption performance remains constant. The surface treatment of SanerVib^® has also been enhanced to ensure that their ageing is close to the life of the transformer. As a result, unlike other solutions, they do not need to be replaced.