Diagnose before equipment

Power Quality Assessment for Repeated Industrial Trips

A power quality assessment records voltage, event timing, and equipment behavior so a plant can distinguish voltage sags, interruptions, harmonics, transients, and process-side causes.

Suggested start30-day monitoring, extended when event frequency requires it.
Measured dataRMS voltage, depth, duration, phase, count, harmonics, transients, timestamps.
Business outcomeDefine the lowest practical protection boundary before buying equipment.

How it works

Connect the disturbance to the protected boundary.

Application fit

When it fits—and when it does not.

When it fits

  • The plant sees unexplained VFD or control trips.
  • Events are recurring but utility and process records do not align.
  • The protected load and required ride-through boundary are unclear.
  • A capital project needs auditable baseline data and acceptance criteria.

When it does not fit

  • A fixed 30-day window may miss rare events; monitoring duration should reflect known frequency.
  • A single meter at the PCC may not identify the first internal trip.
  • Metering data without synchronized VFD, PLC, and process records can leave causality unresolved.
  • A report should not recommend equipment using unverified vendor claims or missing load data.

Engineering inputs required

Define the project with measured information.

  • One-line diagram and known trip history
  • PCC and sensitive-load measurement points
  • Synchronized VFD, PLC, and process timestamps
  • Plant acceptance criteria and reporting period

Next engineering step

Wilson Load-Layered Architecture →Describe the Event →Choose whole-line protection →Estimate downtime loss →
Sources / References
  1. IEC 61000-4-30: Power quality measurement methods. Measurement and interpretation methods for voltage dips, interruptions, harmonics, transients, and other power-quality parameters. Accessed 2026-08-24.
  2. IEEE 1159-2019: Monitoring Electric Power Quality. Recommended practice for describing, measuring, and interpreting power-quality phenomena. Accessed 2026-08-24.

Engineering review

Tell Us What Happened

No waveform or power-quality record is required. Just tell us what stopped and what you observed.

Describe the EventEmail an Engineer