Monitoring for geomagnetic induced current flow effects using existing EMS telemetering

During the solar magnetic disturbance (SMD) of March 13, 1989, which resulted in large-magnitude geomagnetic induced currents (GIC) in North America, it is believed that two phases of one of the generator step-up transformers at the Public Service Electric and Gas Company (PSE&G) Salem Generating Station were damaged. Subsequent to this event, a new application program was written on PSE&G´s control center energy management system (EMS) to monitor the transformers at Salem and other locations in its bulk power system for the effect of GIC flows. This monitor has successfully and accurately detected subsequent SMD-caused GIC effects in the transformers in both the Salem and Hope Creek generating stations. In turn, these measurements are used to alert the control center and generating station personnel to the hazard so that corrective action may be initiated