Securing emergency power supply operation in a rehabilitation hospital

Segment background

Hospitals, including specialized facilities like rehabilitation hospitals, are mission-critical institutions that require a consistent, high-quality power supply. Modern healthcare environments use sophisticated and costly medical devices in settings ranging from intensive care units to surgical theaters. While these advanced equipments enhance care, they can also introduce power quality issues like harmonic distortion.

When connected to the public grid, these centers are susceptible to disruptions, including power outages and voltage sags. Such power quality challenges impact not only operational efficiency but also raise costs and compromise patient safety and comfort. For rehabilitation hospitals, where the focus extends to comprehensive recovery programs like physical and occupational therapy, maintaining a reliable power supply is particularly crucial for effective treatments.

Hospitals equipped with diesel generators have an added layer of resilience, ensuring uninterrupted power during grid failures or other electrical disruptions.

Challenges at the customer’s facility

A rehabilitation hospital in Switzerland faced persistent issues with its emergency supply diesel generators. During network supply interruptions, these generators would consistently fail, operating only for a brief period ranging from a few minutes to a couple of hours. The underlying cause was identified as harmonic distortion in the electrical network.

This distortion leads to several adverse effects: it induces thermal stress on the generator’s internal components, results in increased power losses in windings and the rotor, and ultimately decreases the equipment’s lifespan. Consequently, the generators become less reliable, posing a risk to the hospital’s emergency power supply during critical situations. Addressing harmonic distortion is essential for ensuring the system’s reliability and longevity.

Our Merus® Solution

The hospital opted for a robust solution by installing four Merus® A2-Active Harmonic Filters, strategically placed in each of the establishment’s four main electrical feeders. These filters are specifically designed to tackle the issue of harmonic distortion that has been causing the diesel generators to trip.

By effectively mitigating these harmonics, the filters enhance the overall quality of the power network, both during emergency operations and under normal grid supply conditions. As a result, the diesel generators can operate without unexpected shutdowns during network supply interruptions, guaranteeing a consistent and reliable power supply for the hospital.

Implementing these Merus® A2 Active Harmonic Filters fortifies the hospital’s power infrastructure, making it more resilient and dependable in critical situations.

Segment / Application

Rehabilitation hospital with diesel generators



Power quality issue

  • High harmonic distortion

Merus® Solution

Customer Benefits

  • Reduced diesel generator downtime in network supply interruption
  • Safe emergency supply operation
  • Mitigated harmonic distortion
  • Longer lifetime of sensitive electrical equipment
  • Improved power quality

Results after installation

Following the commissioning procedure, each of the Merus® A2-Active Harmonic Filters performed as expected, fully aligning with their preset parameters. During subsequent emergency power supply tests, the hospital experienced zero failures; the diesel generators operated flawlessly without tripping. This outcome provided concrete evidence for the customer that the issue of harmonic distortion had been effectively addressed.

The Merus® A2-Active Harmonic Filters not only resolved the problem but also instilled a newfound confidence in the reliability of the hospital’s emergency power system.

Do you have any questions?

Please contact one of our salespeople with questions and inquiries.

Riku Kalliomaa

Head of Sales,
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+358 50 3323 020

Jaakko Poutamo

Sales Manager,
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Mikko Zavertkin

Sales Manager,
Key Accounts & OEMs

+358 40 5908 858

Viktoria Mansikkala

Sales Manager,
Baltics & Eastern and Southern Europe

+358 44 9 735 737

Juhani Jaatinen

Senior Sales Manager,
DACH, Benelux, France,

+49 160 762 4909 (DE)

Venkatesh Ramachandra

Regional Sales Manager,
Middle East

+971 50 55 38 465
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