This practical guide shows you how to complete a signed, QR-verified Power Quality & Harmonics Survey Report certificate in OhmCert Module #06 and how to troubleshoot non-compliant readings on site.

1. Step-by-Step OhmCert UI Workflow

  1. Open Module #06: Navigate to Power Quality & Harmonics Survey Report from the Dashboard.
  2. Load a 1-Click Standard Annex Preset: Open the blue Standard Annex banner at the top and click a preset (such as "LV 400 V Commercial/Industrial PCC (Isc/IL = 20 - 50)") to populate target limits automatically.
  3. Enter Your Field Measurements: Fill in the measured inputs (Voltage THD, PCC Bus Voltage Level (IEEE 519-2014 Table 1), Current Distortion TDD, Short Circuit Ratio Isc / IL, Voltage Unbalance, Long Term Flicker Plt, Displacement Power Factor, System Frequency). Blank inputs stay neutral PENDING.
  4. Complete the 14-Point Checklist: Grade each item, attach photos if needed, and export the SHA-256 signed PDF certificate.

2. Worked Numerical Field Case Study

Scenario: LV 400 V Commercial/Industrial PCC (Isc/IL = 20 - 50) (IEEE 519-2014 LV) — Standard LV bus (<= 1 kV): THDv <= 8.0%, TDD <= 8.0%, 50 Hz..

  • vlevel: <= 1.0 kV (LV Bus - 8.0% IEEE 519 / EN 50160)
  • Short Circuit Ratio Isc / IL: 20 - 50
  • System Frequency: 50.00 Hz
  • Displacement Power Factor: 0.97

3. Engineering Troubleshooting: Corrective Actions When a Reading Fails

  1. Install 7% (189 Hz at 50 Hz) or 5.67% series detuned reactors in all reactive power compensation capacitor banks.
  2. Fit 3% to 5% AC line reactors or DC link chokes on 6-pulse Variable Frequency Drives (VFDs).
  3. Deploy closed-loop Active Harmonic Filters (AHFs) sized for harmonic current spectrum up to the 50th order.

→ Try This Worked Example Live in Module #06 (Power Quality & Harmonics)