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Hall Effect Current Sensors in High-Speed Rail: Application of a Modified CTL-601/500, and a CTA-201-F22

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May 19, 2016


CTL Current Transformer





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 (left) is a current sensor and the CTA (bottom) 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.


CTA Process Signal Conditioner

View the CTL/CTA specification sheets for more detail:

CTL- Small Window
CTL- Medium Window
CTL- Large Window
CTL- Bus Bar Window

CTA- Signal Conditioner


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