PETRA is the producer of transformers that are only made according to customer’s requests, beginning with the number of secondary or primary voltages, currents, type of protection, dimensions, mounting hardware or special applications that need our technical support.
We design and produce toroidal transformers since 1991 and niche products are our specialty.
As the range of toroidal transformers goes between 3-10000 VA, the mono-phase ones and up to 30 kVA  the three-phase ones we have decided to cover the needs of customers that request higher powers or other winded products.
We have designed  a series of mono-phase laminated transformers, power range 5-25 kVA and 30-125 kVA three-phase and insert in our production a series of DC inductors and reactors for detuned capacitor banks. We are also distributors for voltage regulators and AC servo-mechanical voltage stabilizers.

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