European patent for DTH technology element

DTH – Distributed Hybrid Transformer technology, awarded the title of Energy Transformation Leader 2026, has reached another important stage of development. The invention developed at Lukasiewicz – Institute of Electrical Engineering has been granted European patent protection.

Patent No. EP4422010 relates to “A method and system for short-circuit protection of a DVR voltage variation compensator.” Information about the patent was published in European Patent Bulletin 19/2026.

The patented invention is an essential component of DTH technology. It is responsible for the safety of the system’s operation, protecting the compensator from the effects of short-circuits occurring both on the side of the receiver fed from the power grid and in the area of the addition voltage converter.

The authors of the invention are Tomasz Sak, Piotr Mazurek, Krzysztof Zymmer and Andrzej Pawlaczyk.

The 630 kVA Distribution Hybrid Transformer prototype has been developed for installation in new and upgraded MV/NV substations. The device is used to stabilize voltage in low-voltage networks and supports applications in modern Smart Grid systems. It enables continuous output voltage regulation within ±10% Un, improvement of voltage quality parameters, support for integration of distributed RES sources, and compensation of reactive power and voltage asymmetry within a limited range.

The project “Distribution Hybrid Transformer (DTH) as an active component of modern Smart Grid systems” has been funded under Measure 4.1.4 of the Intelligent Development Operational Program.

The obtained European patent strengthens the position of Łukasiewicz – Institute of Electrical Engineering as a center developing technologies that meet the real needs of the electric power sector. It is also a confirmation of the implementation potential of the ongoing research and development work and the competence of the teams involved in the development of modern solutions for network infrastructure.