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Case study
± 4 min
Silent transformerupgrade for Enexis
In Zevenhuizen, Merford delivered a modular acoustic barrier alongside a new controllable transformer for Enexis. This combines grid reinforcement with effective control of low-frequency noise for the surrounding area.
The execution required precise and flexible planning. The transformer replacement and barrier installation were carefully coordinated to minimise downtime.
Reliable energy supply with controlled noise levels
The energy transition is placing increasing demands on the electricity grid. Solar panels, wind energy and the growing use of electrical installations require a robust and flexible network. For Dutch grid operator Enexis, this means continuous investment in maintaining and upgrading existing infrastructure.
In Zevenhuizen (Groningen), reports of voltage dips and complaints made it clear that the existing transformer needed replacement. The new remotely controllable transformer provides improved control over voltage levels, but also introduced a new challenge: managing low-frequency noise for nearby homes.
Custom-made noise barrier for varying sound levels
The controllable transformer allows power output to be adjusted to actual demand. During the day, when solar energy is fed back into the grid, the required capacity differs from night-time operation. These variations influence the transformer’s noise levels. Especially during periods of low ambient noise, low-frequency sound can become noticeable.
For this situation, Merford designed and installed a modular acoustic barrier. The system is constructed from SKS panels made of sendzimir galvanised steel, filled with high-performance acoustic material and finished with a perforated plate. Production took place in Merford’s own facility in Gorinchem. For safety, the barrier is equipped with a Merford M41 emergency door with an anti-panic lock.
The execution required precise and flexible planning. The transformer replacement and barrier installation were carefully coordinated to minimise downtime. For users in the area, this resulted in only limited interruption to the electricity supply.
Installation on the existing concrete foundation and anchoring proved more complex in practice than anticipated. Close collaboration between Enexis and Merford ensured these challenges were resolved efficiently and safely.
Captured on site
Grid reinforcement with respect for the surroundings
With the new transformer and acoustic barrier in place, the Zevenhuizen site is prepared for increased grid capacity, while noise impact on nearby residents remains controlled.
This project demonstrates that grid reinforcement and living environment quality can be effectively combined. As the Netherlands continues to expand its electricity network, meeting strict safety and acoustic requirements remains essential.
For Enexis and Merford, the project underlines the importance of collaboration in delivering a reliable, future-proof and quiet electricity network.
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