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Uncovering the Hidden Cause of Voltage Swell During Recloser Operations
This white paper investigates the counterintuitive phenomenon of voltage swell occurring during recloser operations, typically associated with voltage sags or outages. Through analysis of three-phase system grounding and real-world monitoring data, the paper demonstrates how neutral shifts during line-to-ground faults can temporarily raise voltage on non-faulted phases. Characteristic timing and waveform signatures are used to distinguish these swells from other power quality disturbances, enabling accurate diagnosis and targeted mitigation.
Key topics include:
- Recloser Operation
- Faults in a 3-Phase System
- Recloser Swell Example
Why utilities should care:
Understanding voltage swell from recloser operations enables accurate identification of power quality events, reduces misdiagnosis, and supports targeted corrective actions such as improved grounding, enhancing system reliability and minimizing unnecessary troubleshooting.
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