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The Voltage Event You
Don’t See Coming
Ferroresonance is rare, poorly understood, and often misclassified—but when it occurs, the damage can be severe. In solar installations, this non-linear behavior can emerge quietly during light-load conditions and persist long enough to stress transformers, insulation, and connected equipment.This white paper focuses on how ferroresonance develops in solar step-up transformers, why solar sites are uniquely vulnerable, and how detailed power quality data can be used to recognize it before assumptions lead you in the wrong direction.
Key topics include:
- Common Causes in Solar Applications
- How to Identify with PMI PQ Recorders
- How to Resolve the Issues
Why utilities should care:
Ferroresonance doesn’t announce itself as a fault and often doesn’t look like a standard transient. Misidentifying it can lead to repeated equipment stress, unexplained transformer failures, and ineffective mitigation efforts. For utilities supporting or interconnecting solar generation, understanding when ferroresonance is possible—and how to recognize it in PQ data—helps protect assets, avoid misdiagnosis, and make better operational decisions.
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