About Us

SERGI Transformer Protector in the world leader in prevention of transformer explosions and fire.

Who We Are

SERGI Transformer Protector is a French company founded in 1955 with the support of EDF Electricité de France. The initial purpose of the company was to find a solution to extinguish transformer fire and prevent oil filled transformers from exploding.

After a few years of research, the first drain and stir system was invented as an alternative to the water extinguishing system.

Building on this foundation, SERGI created the first Nitrogen Injection Fire Protection System (NIFPS) through our SERGI 3000 System.

By the end of the 1990s, we reached another milestone by developing the TRANSFORMER PROTECTOR (TP), a groundbreaking technology in transformer safety.

SERGI Management Pillars


Culture & Engagement

Capacities & Innovation

Governance & Financial Management

Our Values

The values that characterize SERGI Transformer Protector are experience and robustness. Our ambition is to leverage these values and move towards innovation and performance. Our fundamental essence embodies a family-owned, independent company, on a human scale, with an international vocation.

We aim to strengthen our contribution to today’s and tomorrow’s social challenges, in France and around the world.


The TRANSFORMER PROTECTOR (TP) is a cutting-edge mechanical solution, independent of third-party sensors. It acts within milliseconds following a fault event, rapidly depressurizing the transformer before static pressure can build up.

SERGI pioneered the transformer explosion and fire prevention market. It remains the only proven solution against transformer explosions and fires.

The TRANSFORMER PROTECTOR, customized for each transformer design, can be installed on both existing and new transformers, from 0.1 MVA to 1,000 MVA and beyond as demonstrated by its application in a 1,250 MVA transformer within a Nuclear Power Plant.

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In keeping with our unwavering dedication to enhancing power resilience and bolstering robustness, SERGI has conducted numerous live tests at renowned independent laboratories, including the Électricité de France (EDF) High Voltage Laboratory in 2002 and 2022, as well as the CEPEL High Voltage Laboratory in 2004.

During these tests was proved that the TRANSFORMER PROTECTOR (TP) is extremely successful in protecting transformers from explosions during arcing faults with performances above and far beyond expectations for a Fast Depressurization System complying with the NFPA code 850.

Our missions

Improve knowledge on phenomena associated with transformer explosions and fires to develop preventive technologies
Develop solutions to meet customers’ needs
Educate actors to highlight risks from transformer explosions and fire
Assure implementation of preventive means on transformers
Lead actions to implement new regulations to ensure a safer and more sustainable energy grid and transformer installations​

SERGI TP will make sure to be profitable to lead these missions and ensure answering to customers’ requirements.

Today SERGI Transformer Protector is the undisputable leader in preventing transformer explosions and fires, backed by certifications of ISO 9001, ISO 45001 and ISO 14001.

SERGI’s TP technology, the TRANSFORMER PROTECTOR, provides multifaceted protection, preventing transformers from exploding and consequently safeguarding:

Financial Investments: Save substantial amounts of money from potential damages and repairs.
Surrounding Areas: Protect immediate areas from potential damages.
Human Lives: Prioritize and ensure the safety of people.
Environment: Prevent harmful transformer oil leakages, preserving ecosystems.
Financial Assets: Avert significant financial losses from damages and downtimes.
Reputation: Uphold and reinforce the credibility and trustworthiness of our customers

To support its activities, SERGI TP is always looking for the best talent to become the future leaders of the company.