Application
Our combined instrument transformers with paper-oil insulation merge together the functions of a current transformer (CT) and an inductive voltage transformer (VT). They electrically isolate measuring devices like meters, relays, and protection equipment from the high-voltage circuit, all by reducing current and voltage levels to measurable and safe values. Their design consists of multiple secondary windings for measurement and/or protection, which makes them especially suitable for substations where space constraints or installation costs make separate measuring transformers impractical. Their high accuracy classes also allow them to be used at metering points. Combined transformers are designed for voltages in the 72.5–300 kV range.
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High-voltage combined transformers with paper-oil insulation are designed to operate under extreme climatic conditions and at altitudes exceeding 1000 m above sea level. They are suitable for a wide temperature range, areas subject to earthquakes, and strong wind conditions. They can be transported and stored in either horizontal or vertical position.
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