An instrument transformer’s role is to provide accurate inputs to protection, control and metering systems including revenue metering. To transform currents or voltages from a usually high value to a value easy to handle for relays and instruments. To insulate the metering circuit from the primary high voltage system. To provide possibilities of standardizing the instruments and relays to a few rated currents and voltages.

An instrument transformer’s role is to provide accurate inputs to protection, control and metering systems including revenue metering. To transform currents or voltages from a usually high value to a value easy to handle for relays and instruments. To insulate the metering circuit from the primary high voltage system. To provide possibilities of standardizing the instruments and relays to a few rated currents and voltages.