Power Quality Surveys / Sample Report
Sample report

What a finished report looks like

People buy reports they can see. This is a walk-through of the format we deliver — the charts, the findings and the recommendations. The data below is illustrative, not a real client.

SiteIllustrative — commercial premises
Monitoring14 days, incomer + 2 sub-boards
InstrumentClass A · BS EN 61000-4-30
Assessed toBS EN 50160 · ENA G5/5

Executive summary

Action recommended

Voltage, frequency and flicker were within BS EN 50160 limits throughout. However, the 5th harmonic exceeded the G5/5 planning level at the main incomer, driven by variable speed drives on the HVAC plant, and the displacement power factor averaged 0.82 — attracting avoidable reactive-power charges. Twelve short voltage dips were recorded, correlating with the reported control-system resets. Targeted harmonic filtering, power factor correction and load segregation are recommended, with an estimated payback under two years.

The measurements

Harmonic spectrum5th harmonic above G5/5 planning level
Voltage & dips12 dips captured over 14 days
Load & demand profilePeak demand identified for sizing
THD vs thresholdBreaches during afternoon peak

Findings

ParameterResultLimit / referenceStatus
Supply voltageWithin ±10%BS EN 50160Pass
Frequency49.9–50.1 HzBS EN 50160Pass
Flicker (Plt)0.8≤ 1.0Pass
5th harmonic voltage6.4%G5/5 planning levelExceeded
Voltage dips12 eventsCorrelated with resetsInvestigate
Displacement power factor0.82Target ≥ 0.95Improve
Phase unbalance2.1%≤ 2%Marginal

Recommendations

  1. Install tuned harmonic filtering at the HVAC drive panel to bring the 5th harmonic within G5/5.
  2. Fit detuned power factor correction at the main incomer to raise power factor toward 0.95 and remove reactive charges.
  3. Segregate sensitive controls onto a cleaner sub-board to stop dip-related resets.
  4. Rebalance single-phase loads across phases to bring unbalance below 2%.
  5. Re-survey after works to confirm compliance and document the improvement.

All figures on this page are illustrative and do not represent a specific client site.

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