This practical guide shows you how to complete a signed, QR-verified PFC Capacitor Bank Step Current & Detuned Harmonic Reactor Audit certificate in OhmCert Module #28 and how to troubleshoot non-compliant readings on site.

1. Step-by-Step OhmCert UI Workflow

  1. Open Module #28: Navigate to PFC Capacitor Bank Step Current & Detuned Harmonic Reactor Audit 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 "50 kVAr / 440 V Step + 7% Detuned Reactor (189 Hz) on 400 V Bus") to populate target limits automatically.
  3. Enter Your Field Measurements: Fill in the measured inputs (Measured Busbar Line-to-Line Voltage U_L, Capacitor Nameplate Rated Voltage U_CN, Step Nameplate Reactive Power Q_CN (at U_CN), Series Harmonic Detuning Reactor Factor p, System Nominal Frequency f, Measured Step Phase Current I_L1, Measured Step Phase Current I_L2, Measured Step Phase Current I_L3, Detuning Reactor Core / Coil Temperature, Monthly Active Energy Consumption E_active (optional), Monthly Inductive Reactive Energy E_ind (optional), Monthly Capacitive Reactive Energy E_cap (optional)). Blank inputs stay neutral PENDING.
  4. Complete the 13-Point Checklist: Grade each item, attach photos if needed, and export the SHA-256 signed PDF certificate.

2. Worked Numerical Field Case Study

Scenario: 50 kVAr / 440 V Step + 7% Detuned Reactor (189 Hz) on 400 V Bus (IEC 60831-1 7% Detuned) — Standard industrial detuned step delivering Q_eff = 44.45 kVAr (I_nom = 64.2 A) at 400 V..

  • Measured Busbar Line-to-Line Voltage U_L: 400 V
  • Capacitor Nameplate Rated Voltage U_CN: 440 V
  • Step Nameplate Reactive Power Q_CN (at U_CN): 50 kVAr
  • Series Harmonic Detuning Reactor Factor p: 7% (Tuning 189 Hz - Standard Industrial Detuned)
  • System Nominal Frequency f: 50 Hz
  • Measured Step Phase Current I_L1: 64.2 A
  • Measured Step Phase Current I_L2: 63.8 A
  • Measured Step Phase Current I_L3: 64.5 A
  • Detuning Reactor Core / Coil Temperature: 78 degC
  • Monthly Active Energy Consumption E_active (optional): 120000 kWh
  • Monthly Inductive Reactive Energy E_ind (optional): 14500 kVArh
  • Monthly Capacitive Reactive Energy E_cap (optional): 8200 kVArh

3. Engineering Troubleshooting: Corrective Actions When a Reading Fails

  1. Replace any capacitor can whose measured current / capacitance has dropped by more than 10% below expected I_nom or shows top-cap overpressure bulging.
  2. Replace welded AC-6b contactors or blown HRC fuses causing > 5% 3-phase step current unbalance.
  3. Add an inductive shunt reactor (SVC) step or fine-grained 2.5-5 kVAr steps if night/weekend LED & UPS loads push capacitive export toward the 15% utility penalty.

→ Try This Worked Example Live in Module #28 (PFC Capacitor & Reactor)