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Carelabs

IEEE 1584 · Engineering

Harmonic Study & Analysis - Carelabz Czech Republic

Carelabs delivers harmonic study and analysis for industrial and commercial facilities across the Czech Republic, measuring total harmonic distortion with a harmonics analyser and modelling system impedance versus frequency to identify resonance risk. Where levels exceed the limits set in ČSN EN 50160, we recommend mitigation — harmonic filters, relocated power-factor correction capacitance, or higher-pulse-number rectifiers — and verify compliance with ČSN 33 2000.

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The measurement decides the conclusion

Two instruments on the same busbar can report materially different distortion if they aggregate differently. Before results mean anything, the method behind them has to be defined.

What We Deliver

Instrumentation to a defined class

Measurement follows the methods set out in the IEC 61000-4-30 framework, which fixes how values are sampled, aggregated and time-stamped. Results obtained by undefined methods cannot be compared between campaigns or against a network operator's own data.

WHY IT MATTERS

Numbers that cannot be compared

A distortion figure without its measurement method is close to meaningless. It cannot be checked against a limit, compared with a previous campaign, or discussed with the network operator on equal terms.

  • Measurement point fixed at the point of common coupling for any compliance statement, since that is the only boundary where limits apply.
  • Voltage and current recorded together, because one describes what your equipment experiences and the other what you inject into the network.
  • Demand-referenced current distortion used for compliance, as distortion against instantaneous current rises at light load even when nothing has changed.
  • Logging period covering real production including start-up and low-load periods, rather than a convenient window.
  • Instrument calibration certificates retained, since an uncalibrated reading is an opinion presented as a measurement.
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DELIVERABLES

What you receive

Issued against ČSN 33 2000 and the applicable distortion limits, with the measurement method stated in full.

  1. 1Measured voltage and current distortion with the complete harmonic spectrum
  2. 2A stated measurement method: point, instrument class, aggregation interval and period
  3. 3Assessment against applicable limits with the basis of each limit given
  4. 4Attribution by feeder identifying which loads produce which orders
  5. 5A repeat-measurement specification so future campaigns are comparable with this one
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How the study runs

01

Define what must be proven

A compliance statement, a diagnosis or a pre-purchase check each require different measurement points and intervals, so the question is fixed before instruments are installed.

02

Fix the method

Measurement point, instrument class, aggregation interval and logging period are agreed and recorded, which is what makes the result defensible later.

03

Log across real operation

Recording covers the genuine operating cycle including shift changes and the low-load periods when capacitor stages switch.

04

Model the network

A frequency scan in ETAP locates resonance, which measurement alone cannot reveal and which governs which mitigation is safe.

05

Assess and attribute

Results are compared against applicable limits and the spectrum at each feeder identifies the loads responsible.

06

Report with the method attached

Findings are issued together with the measurement basis, so any future campaign can be compared rather than merely repeated.

Frequently asked questions

Because limits are written against specific aggregation intervals and instrument behaviour. A three-second value and a ten-minute average of the same busbar differ substantially, so a figure quoted without its interval cannot be checked against any limit. It also cannot be compared with a network operator's own records if the cause proves to be upstream.
Sometimes. What matters is whether it records the full harmonic spectrum to a defined method and holds calibration, rather than reporting a single summary figure. Many installed meters report THD only, which is useful for trending but insufficient to establish a compliance position or to identify which loads are responsible.
A week is the usual minimum, because distortion follows load and a shorter window risks capturing only a production peak or an idle period. Plants with distinct seasonal or campaign operating modes should be measured in each, since extrapolating one mode's spectrum to another is not reliable.
THD expresses distortion relative to the fundamental present at that instant, so it rises as load falls even when nothing has changed. Demand-referenced distortion is measured against maximum demand load current, which is why compliance frameworks use it. Reporting THD alone can make a compliant plant look alarming, or the reverse.

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