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Estimate Feeder Resonance with Simple, Practical Formulas
This white paper explores how adding Power Factor Correction (PFC) capacitors to substation feeders can introduce resonance, potentially leading to system issues. It presents a simplified formula for estimating the primary resonance frequency using readily available system data, such as short circuit MVA and installed PFC MVAR. The paper details the derivation, application, and practical example of the formula, emphasizing the importance of resonance checks when modifying feeder capacitance.
Key topics include:
- Basic Formulas and Definitions
- Harmonics
- Computing System Resonances
- Examples
Why utilities should care:
Understanding and predicting resonance frequencies helps prevent equipment malfunctions and power quality issues when modifying feeder capacitance. Using system MVA and PFC MVAR values, resonance can be quickly estimated, supporting safer, more reliable grid operations.
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