The 72XX Series of Precision AC Current Transformers from Measurements International (MI) continues to follow the longstanding history of quality products. Current transformers are used extensively for measuring current and monitoring the operation of the power grid by monitoring high currents at high voltages. Technical standards and design practices are used to ensure the safety of installations using current transformers.

The accurate measurement of electric energy in highvoltage, high current distribution systems relies on 3 key components: a watt-hour meter, a high-voltage transformer and a high current transformer to step down high-voltage and high current to accurate low levels for input to the kWh meters or other electrical measuring devices. However, if the instrument transformers are not calibrated with similar accuracy, then the precise measurements made by the measuring devices will be with high uncertainty and misleading. For high-voltages and currents, this inaccuracy can have a significant impact on the result. Therefore, the calibration of the instrument transformers has become increasingly important.