| Title |
Calculation and analysis of maximum strength of Geoelectric fields using geomagnetic measurement data over Korean electric power systems |
| Authors |
Bae-Geun Lee ; Soobae Kim |
| DOI |
http://doi.org/10.5207/JIEIE.2020.34.11.044 |
| Keywords |
Geoelectric field strength; Geomagnetic disturbances; Geomagnetic measurement data; Korea power system; Maximum strength of geoelectric field; Surface impedance |
| Abstract |
Geomagnetic disturbances from solar storms cause intensive variations in Earth’s magnetic fields. The changing magnetic field creates the geoelectric field, which accordingly induces currents in transmission lines and power transformers. Thus, geomagnetic disturbances have the potential to disrupt the operation of electric power systems. Electric power systems in higher geomagnetic latitude such as North America and Northern Europe have suffered from the disturbances. In this paper, maximum strength of geoelectric fields occurred over Korean power systems is evaluated using geomagnetic data over the past twenty years. This paper introduces the analytic basis to calculate the geoelectric fields using the geomagnetic measurements. The computation code for the numerical calculation is developed and then accuracy of the code is evaluated by comparing the results with a reference. Maximum strengths of geoelectric fields are analyzed with geomagnetic measurement data at four different locations including Icheon, Gangneung, Yongin and Jeju. Discussions about correlation of geoelectric field strength with locations is provided and the maximum strength is compared with the US geomagnetic standard. |