Cadick Corporation - Technical Bulletin 004a - Ferroresonance: A Brief Explanation
Technical Bulletin 004a - Ferroresonance
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Abstract - This paper:
 + describes the phenomenon of ferroresonance,
 + the conditions under which it may appear in electric power systems, and
 + some techniques for avoiding ferroresonance or mitigating its effects.

Introduction
Ferroresonance is a complex electrical phenomenon that, though identified since the early 1920s, remains little understood today. It is characterized by the sudden onset of very high sustained overvoltages concurrent with high levels of harmonic distortion. Ferroresonance has been known to be responsible for equipment damage and protection malfunctions...

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