Incorporating GIC Data into ERCOT Modeling Processes - Insights & Recommendations
Explore the integration of GIC modeling data into existing ERCOT modeling applications and processes. Understand the initial assessment, identify relevant data, and engage stakeholders for process improvements. Discover how to maintain GIC data within current systems effectively.
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Incorporating GIC data into existing ERCOT Modeling Processes 07/20/2021
ERCOT Modeling Applications and Processes A System Change Request(SCR) is need to integrate GIC modeling data into the existing modeling applications, http://www.ercot.com/mktrules/syschangereq. 2 PUBLIC
GIC Modeling Data Initial Assessment Element Attribute Value Description Example of a Value Grounding Resistance DC Resistance RG: Numeric in Ohms RBRN: Numeric in Ohms/Phase RDC: Numeric in Ohms/Phase dc resistance of Winding in ohms/phase at nominal tap and adjusted to 75 C True GIC Blocker is Present False No GIC Blocker on the winding VecGrp - Alphanumeric Alphanumeric identifier specifying vector group based on transformer winding connections and phase angles Core: Alphanumeric Number of cores in transformer core design Substation dc grounding resistance (ohms) Branch dc resistance in ohms/phase 0.1 0 Substation Line DC Winding Resistance 0 Transformer Winding GIC Blocker on Winding GIC blocking device in neutral of Winding False Transformer Winding YNynd0 Vector Group Power Transformer Core 3 = three phase 3-legged core form 0.00 Power Transformer K-Factor K-Factor: Numeric (no units) A factor to calculate transformer reactive power loss from GIC flowing in its winding (Mvar/Ampere) Winding grounding dc resistance in ohms Power Transformer Winding Grounding DC Resistance Transformer Model RGDC: Numeric in Ohms 0 Transformer Winding Transformer Model in GIC dc Network = 0, two and three winding and autotransformer model as defined by its vector group = 1, Transformer as T model in dc network DC resistance in ohms/phase adjusted to 75 C 0 = two and three winding and autotransformer model T-Model: Alphanumeric Transformer Coil DC Resistance R: Coil DC Resistance 99999 Shunt Grounding DC Resistance RG: Numeric in Ohms Grounding dc resistance in ohms 99999 Shunt 3 PUBLIC
GIC Modeling Data Identify GIC data that could possibly be maintained within current ERCOT modeling processes. Engage those WGs to discuss possible adjustments to current process to improve the GIC model building. Network Data Support Working Group (NDSWG) - NMMS SSWG Topology Processer and MOD Others? 4 PUBLIC
