Closed-Loop Sensors With Magnetic Probe Extend High-Precision Current Measurement To Higher Current Levels

by Klaus Reichert, VACUUMSCHMELZE (VAC), Hanau, Germany, How2Power Today, Jul 15 2013

Focus:
High-precision current measurement is critical for many applications, such as measurement of motor torque in drive systems or, in the energy sector, of current fed into the power grid. Meanwhile, wide-range current measurement is useful in designing high-efficiency control circuits and ensures safe and accurate short-circuit current measurement. This article focuses on a class of current sensors well suited for high-power applications—closed-loop sensors with magnetic probe. The characteristics, benefits, and principles of operation of these sensors are explained along with the key elements of sensor design that determine their performance. With that as background, a new family of sensors is introduced. Members of this family extend the range of closed-loop sensors with magnetic probe to much higher ratings (1000 A eff) and measurement ranges (±2500 A) than were previously possible. Data is presented demonstrating the linearity, relative error (at room and low temperature), step response, and external field sensitivity of the new sensors.

What you’ll learn:

• How to understand the operation and benefits of closed-loop sensors with magnetic or flux-gate probe in high-precision, high-current measurement

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