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Pinpointing the Source of Voltage Sags for Effective Power Quality Mitigation

This white paper explores methods to distinguish whether voltage sags originate upstream in the distribution network or downstream at the customer load. By analyzing the relationship between voltage and current during sags, the paper outlines diagnostic techniques, supported by real-world examples, to accurately locate the source and guide mitigation efforts.

Key topics include:

- Voltage Sag Basics
- Sag Voltage and Load Currents
- Examples

Why utilities should care:
Accurately identifying the origin of voltage sags enables faster, targeted mitigation, reduces unnecessary troubleshooting, and improves power quality. Understanding sag patterns helps optimize monitoring strategies and supports more reliable, efficient grid operations.


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