Geomagnetically Induced Currents Measured in BPA Transformers, Near-Real-Time
Charged particles from the sun impacting Earth's magnetic field sometimes introduce significant currents into
BPA's transmission system. These currents can be measured on the wire connecting a 3-phase power transformer's
neutral to ground. The chart below illustrates GIC data from 12 BPA substations.
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Content Manager: Jim Burns, Transmission Technical Operations