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Identifying Capacitor Bank
Switching Events in PQ Recordings
Capacitor bank switches leave behind a distinct waveform fingerprint—but only if you know how to spot it. This white paper introduces a practical, three-part method to recognize capacitor bank operation inside waveform recordings. Utilities can use these indicators to improve event classification, respond faster to voltage shifts, and avoid misinterpreting switching as load behavior or faults. With more DERs and more variability in the grid, tools that reveal the why behind voltage changes are critical. This paper walks through the theory and shows how it plays out using a real-world recording.
Key topics covered:
- How to recognize oscillatory transients caused by switching
- What step voltage changes indicate and what they don’t
- Why small current variation rules out load activity
- Real-world waveform example with annotated plots
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