Hall Effect Current Sensors (CTL/CTA)

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Hall Effect Current Sensors (CTL/CTA)-Image

Hall Effect current measurement is a non-contact technique that measures the magnetizing effects of current flowing in a conductor. This measurement type offers a number of benefits not afforded by conventional direct or contact (in-line) measurement. Some of these benefits include high electrical isolation between conductor and sensor output, high overload capability, fast response to input changes and no power consumption on measured circuit. The most popular Hall effect current sensor products are the CTL/CTA product families. The CTL is a current sensor and the CTA is a signal conditioner which provides the nominal output. These two units are factory calibrated together for maximum accuracy and linearity. This combination gives the greatest flexibility in terms of inputs and outputs.

In the U.K, a modified version of the CTL sensor, manufactured by OSI, is performing. The sensor is mounted on the underside of an AC electrified train. The sensor is monitoring DC offsets to the AC signal. In the past, it has been difficult for this company to find a sensor which can withstand the large current transients (up to 500A) that appear when the train goes through a neutral section (no power to the train). The transients are caused by the operation of a vacuum breaker, which tended to cause a large permanent residual DC offset in other sensors.

The modified sensor is performing well in the application without DC offset issues.

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What Does OSI Do?
Ohio Semitronics, Inc. develops and delivers power measurement technologies, transducers, and current sensors, from its plant in Hilliard, Ohio. OSI’s range of measurement technologies perform in a variety of demanding environments such as Petroleum and Petrochemical, Electric Utility, Solar and Wind, Test and Measurement, Automation and Control, and Naval Surface and Subsurface applications.