Three-phase dry-type transformers with air-barrier insulation with switching without excitation (PBV), designed to convert electrical energy in power networks of three-phase alternating current frequency of 50 Hz. Voltage regulation up to 5 per cent in steps of 2.5 per cent PBV is performed by shifting the jumpers.
They are installed in industrial premises and public buildings, which are subject to increased requirements in terms of fire safety, explosion protection, environmental cleanliness.
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