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Power Quality & Energy File Analyser

Two analyses from the files meters and power-quality analysers export: maximum demand, load factor and profiles from an interval load profile; and EN 50160 compliance (voltage, harmonics, flicker, unbalance, frequency) from a week of 10-minute values.

Load profile

Result

Open a load profile or load the sample.

Tool guide · know before you use

What this tool is, how it works and how far to trust it

An analyser for meter and PQ analyser exports: maximum demand and load factor from a load profile, and EN 50160 compliance from a week of 10-minute values.

Read this before relying on a result. Every method, formula, assumption and limit is stated here, so you can check the answer yourself instead of accepting it blindly.

What it can do

  • Load profile: read kW per interval, kWh per interval or cumulative kWh; compute maximum block demand (15/30/60 min), average, load factor, energy, daily maxima, 24-hour average profile, top 10 peaks and peak / off-peak energy.
  • Power quality: read phase voltages, THDu, Pst/Plt, unbalance and frequency; compute EN 50160 compliance per parameter with percentiles and extremes; count values below 90 % of Un.

Why you need it

  • Demand charges are set by a handful of peaks; knowing when and why they happen is the cheapest saving.
  • Power-quality complaints are settled against EN 50160 over a full week, with percentiles that are easy to get wrong by hand.

Understand this first

  • Maximum demand is the highest average over the tariff's integration period, not the highest instantaneous value.
  • Load factor = average demand / maximum demand: a low value means short peaks that cost demand charges.
  • EN 50160 sets limits for 95 % (or 99 %) of the 10-minute values of a week: e.g. THDu ≤ 8 %, Plt ≤ 1, unbalance ≤ 2 %, voltage within ±10 %.

What you need before you start

  • A load profile export from the meter (CSV), ideally a full month.
  • A week of 10-minute values from a PQ analyser (CSV) and the nominal voltage.
  • A current browser (Chrome, Edge, Firefox or Safari). Nothing is installed and your data is never uploaded; it is processed on your own computer.

How to use it

  • Choose the tab, open the file (or load the sample) and set the demand period or the nominal voltage and network level.
  • Read the KPIs and findings, then the profile, peaks or the parameter table.
  • For a failing PQ parameter, note the time pattern of the worst values and measure the suspected loads.

What you get

  • Load: maximum demand with time, average, load factor, energy, findings, hourly profile and top peaks.
  • PQ: compliance per parameter with limit, percentage within limit and extremes; findings.

How to read the results

  • One day's peak well above the others: a coincidence of starts — staggering them cuts the demand charge.
  • THDu failing in the evening only: a specific load (rectifiers, drives) — locate it with harmonic measurements per feeder.
  • Plt failing on working days: a fluctuating load such as an arc furnace or welder.

Technical basis

  • EN 50160; IEC 61000-4-30 10-minute aggregation; IEC 61000-4-15 flicker; tariff block-demand practice.

Limits: when not to rely on it

  • EN 50160 frequency limits refer to 10-second values over a year; 10-minute values give an indication only.
  • The tool reads the meter's values; it cannot correct for wrong CT/VT ratios or a meter set to the wrong integration period.

Sample files for this tool

Download, open and compare with what the guide says you should see.

All sample files and what to expect →

For preliminary engineering use. Results must be checked by a qualified engineer against the project's standards. How results are checked · Terms & disclaimer · Privacy · Build 7cfcbe2 · 2026-11-14