GIC and Substation Coordinates for Line Taps
To properly perform geomagnetic induced current (GIC) analysis, substation geographic coordinates (longitude, latitude) must be provided for all substations that contain terminals of transmission lines for which a GIC-induced equivalent DC voltage is applied. Generally this includes all lines greater than the minimum length and minimum voltage specified on the GIC Analysis Form. The need for coordinates […]
March 26, 2015
Transformer GIC Thermal Response
This spreadsheet (revised November 3, 2017) includes sample formulas for calculating transformer winding and metallic parts hot spot temperatures as described in the NERC white papers Transformer Thermal Impact Assessment White Paper and Screening Criterion for Transformer Thermal Impact Assessment. It is provided with the following disclaimers: Input parameters in this spreadsheet are samples provided for illustration […]
February 9, 2015
Transformer Time-Series for NERC Benchmark GMD Event and Supplemental GMD Event
The following input files may be loaded to automatically simulate the time-series surface electric fields in the NERC Benchmark Geomagnetic Disturbance Event (May 12, 2016) and Supplemental Event. Benchmark Event (updated November 2, 2017) Supplemental Event (updated June 8, 2018) From PowerWorld Simulator GIC, choose the “Spatially Uniform Time-Varying E-Field” Calculation Mode. Then point to the downloaded CSV file in the “Time-Varying […]
October 10, 2014
Example of Geomagnetic Induced Current (GIC) Calculations
Appendix II of the Application Guide: Computing Geomagnetically-Induced Current in the Bulk-Power System published by the North American Electric Reliability Corporation shows calculations of GIC currents and related quantities for a hypothetical power system with 6 buses and 3 substations. This system is available here for use in PowerWorld Simulator. These may be examined in the free […]
July 18, 2014
GIC Modeling Data Requirements
Some general guides for substation and transformer inputs needed for GMD analysis may be found in the following links, with some specifics as they pertain to PowerWorld Simulator: A spreadsheet template (updated 2/14/2017) which describes the input data for substations and transformers needed to perform GIC analysis. (These are inputs that do not occur in FERC […]
February 14, 2014