Doubling plant capacity in a metallurgical plant by improving power quality

“In the operating process of a 6-ton DC Electrical Arc Furnace at our plant, the quality of power in the network worsened to the extent that melting was no longer possible at all during daytime. After Merus® STATCOM installation, we were able to operate full day and night shifts with good network quality and without any problems.” — Chief Energy Supervisor, Metallurgical plant

Challenges in the customer’s metallurgical plant

At the metallurgical plant, a 6-ton DC Electrical Arc Furnace (EAF) operation suffered from severe voltage variations, which not only destabilized the supply grid but also affected other customers in the neighborhoods. To protect the network and other customers from destabilization, the grid operator suspended daytime operations and the furnace only produced castings at night.

Such restrictions caused huge capacity and financial losses. It was not profitable to run the plant in one shift only and the company’s other operations were affected by short supplies. To restore profitability, it was crucial to find a solution.

Our Merus® Solution

Merus Power’s local partner gathered all the technical information needed to customize a solution. Both Merus® Static Synchronous Compensator (STATCOM) and Merus® Static Var Compensator (SVC) were considered to address the challenge. After due diligence by Merus Power’s technical team, Merus® STATCOM was chosen to solve the problem.

Merus® STATCOM is based on the latest power electronics technology. It provides the fastest response, leaves a smaller footprint, and is a cost-effective solution. The modular production concept made it possible to meet the customer’s request for fast delivery. Merus® STATCOM was connected parallel to the EAF and the commissioning was completed by Merus Power in cooperation with its local partner.

Results after installation

The fast and effective response of Merus® STATCOM ensured that voltage variation was reduced to a minimum, resulting in the stabilization of the supply grid. Thanks to the reliable performance of Merus® STATCOM, no further complaints have been received from the local grid.

The profitability of the metallurgical plant has been restored and the plant now operates day and night. Apart from stabilizing voltage at a 6.3 kV bus bar, Merus® STATCOM reduced flicker and harmonic distortions and improved the power factor. Improved technical parameters have enhanced plant productivity and optimized operating costs.

Segment / Application

Metallurgical industry with Electric Arc Furnace (EAF)

Power quality issue

  • Voltage variations

Merus® Solution

Customer Benefits

  • Doubled plant capacity
  • Improved melt quality
  • Optimized plant operating costs
  • Stabilized voltage and improved power factor
  • Reduction in harmonic distortions and flicker

Do you have any questions?

Please contact one of our salespeople with questions and inquiries.

Markus Ovaskainen


+358 40 539 2145

Aki Tiira

Sales Manager,

+358 20 735 4332

Ville Julin

Sales Manager,
Energy Storage, Europe

+358 40 355 9380
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