Power Quality Monitoring
Power quality cannot be managed unless it is measured. Reactive charges stay invisible until they land on the statement, harmonic distortion until it burns a motor, yet both were measurable weeks earlier.
Score
Six axes, one score
Voltage, frequency, harmonics, imbalance, power factor and demand roll up into one score. When it drops, the axis pulling it down is visible; that is where to act.
Scoring is unweighted; every axis counts the same, because which axis is expensive varies by site. The three lines below the score show the three lowest axes; the card keeps the same scale for comparison across sites.
- Period average and hourly variation
- Count of out-of-limit hours
- Comparison across sites
The axes are scored from the analyser’s own measurements; each axis takes its limit from the standard and can be tightened per site. The score is calculated hourly and its movement through the day reads below the card; two sites compare on the same scale.
Power Quality Score
period average- Harmonics 71 current THD over limit
- Power factor 82 capacitive hours
- Demand 90 within agreed capacity
Reactive
Which hours carry the penalty risk?
Inductive and capacitive ratios on a day × hour map. Charges land on the monthly total, but the problem builds in specific hours: where correction cannot keep up, or capacitors stay switched in overnight.
The map ratios inductive and capacitive kvarh from the main meter hour by hour; the charge line is drawn at the network operator’s threshold. If capacitive cells gather overnight, a capacitor bank is staying switched in while idle; the recommendation card names it.
- Monthly projection: is a charge coming at this rate
- Correction step advice
- Reactive ratio calculated at the main meter
Reactive Consumption Heat Map
InductiveCapacitiveHealth
Your network's health report
Each parameter beside its measured value and the limit in the standard. Hours outside the limit are counted; the report is ready for an audit or a supplier conversation.
The count of out-of-limit hours is kept in the monthly report; if the same parameter goes out of limit three months running it is marked as a persistent finding. The report is ready for a supplier or network operator query, with metering point and period.
Limits default to EN 50160 and the network operator’s thresholds; where the site’s connection agreement sets a tighter value it is changed per row. The table is shown for the main board, and the same table opens on a separate tab for each substation and area board, so the board that goes out of limit is separated from the rest.
- Out-of-limit hours in the daily e-mail
- Voltage and current detail per phase
- Exportable table for audits
Network Health
last 30 days · against limits- Voltage THD 3.4% limit ≤ 8%
- Current THD 14.8% 31 hours out of limit
- Imbalance 1.6% limit ≤ 2%
- Inductive ratio 13.5% charge threshold 20%
- Capacitive ratio 17.2% 22 hours in the charge band
Power factor
How far from the charge?
Power factor is calculated at the main meter from the period’s reactive energy. The distance to the DUoS excess-reactive threshold is written alongside; demand is compared with agreed capacity.
The gauge is calculated from the main meter’s reactive energy for the period; the device cos φ is not used, because settlement meters do not report instantaneous power factor. The ratio on the bill and the ratio on the panel therefore come from the same source and agree.
- Monthly projection: is a charge coming at this rate
- Half-hourly demand against agreed capacity
- A concrete recommendation for the correction panel
Demand is calculated as the half-hourly average power and compared with agreed capacity per supply; transformers add up, supplies do not. Days approaching the limit are counted below the card, and on an excess the charge is written before it reaches the bill.
Reactive Status
period · main meterThe ratio reaches 14.8% on the day shift. Schedule a compensation stage check before the penalty limit.
What we measure, and from where
Measurement provenance
- Voltage
- V
- L-L and L-N · per phase · upper/lower limit tracking
- Current
- A
- L1, L2, L3 separately · imbalance derived
- Power factor
- Cos φ
- Main meter · from period reactive energy
- Harmonics
- THDi · THDu
- Analyser · current and voltage separately
- Reactive
- kvarh
- Import and export metered separately
- Demand
- kW
- Half-hourly · against agreed capacity
- Frequency
- Hz
- Network side
Measurements come from your existing power analysers. If an analyser capable of quality measurement is already installed, no hardware needs replacing; if not, we agree before installation which points need what.
Frequently asked
We have power-factor correction and no reactive charges. Do we need this module?
The correction panel may be sufficient today. Capacitors age, stage contactors stick, the load profile changes, the charges usually start suddenly, one day. The module's job is to show the trend of power factor without waiting for the charge. And reactive is only one dimension of quality: harmonics and imbalance are not fixed by correction capacitors.
Do harmonics need special hardware to measure?
A power analyser that measures THD. Some analysers in the field already do; others only report basic electrical values. We review your existing device list and tell you which are sufficient and which points need an additional device, replacing everything is unnecessary; the main incomer and a few critical boards are usually enough.
If voltage harmonics are high, is it our fault?
Usually not. Current harmonics are born from your load; voltage harmonics come from the network and carry the loads of neighbouring sites too. Because the panel measures the two separately, that distinction can be made. For a voltage-harmonics problem the counterparty is the DNO, and your measurement record is the basis of that conversation.
How is the quality score calculated?
Six axes, power factor, current THD, voltage THD, imbalance, inductive and capacitive ratio, are each scored 0-100 against their own limits, then averaged with weights. Weights and limits are adjustable per site; the defaults rest on published standards. The score's formula is written openly in the panel; it is not a black box.
Is the data in the screenshots real?
The device ranking table is taken from a working site; the device names are that site's own. The heatmap and the quality score are drawn with sample values, publishing a real site's day-by-day reactive profile would expose its production schedule.
Let us measure what is happening on your site.
In a one-hour call we look at your existing setup and set out exactly which measurement points are needed and what you would be able to see.