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Measurement of geomagnetically induced currents in substations

5th June 2017

By: Creamer Media Reporter

     

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This article has been supplied as a media statement and is not written by Creamer Media. It may be available only for a limited time on this website.

Ohio Semitronics USA, have worked with several utility companies in Eastern, Southeastern and Midwest USA to measure a quasi DC current in power substations. This DC current is not generated by the power plant itself rather coming from electromagnetic activity that originates from the sun. Geomagnetic Induced Current (GIC) has been known to interfere with and damage many types of communications and utility power equipment.

Scientists and engineers have been studying these solar flare storms for some years and continue to collect data for documenting, forecasting and developing protective devices. Ohio Semitronics has provided monitoring into several utility applications with the CTH series of Hall Effect DC current sensor. These sensors are installed on the neutral conductor of large substation transformers and sense the DC current in a non-contact method by which the CTH sensor is clamped around the conductor. The sensor housing is equipped with the necessary analog circuitry to provide an isolated DC output that interfaces with an external data logging device.

Another advantage with selecting the CTH series is the standard specified low voltage 24Vdc instrument power option sensor where the availability of a higher AC voltage for instrument power is prohibited.

The CTH sensors are specifically designed for indoor use and are tested to meet a wider than standard temperate range of -40°C to +60°C when adding a “T” in the model number.

Edited by Creamer Media Reporter

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