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Carelabs

IEEE 1584 · Engineering

Harmonic Study & Analysis - Carelabz Russia

Carelabs delivers harmonic study and analysis for industrial and commercial facilities across Russia, measuring total harmonic distortion with a harmonics analyser and modelling system impedance versus frequency to identify resonance risk. Power quality limits are assessed against GOST 32144, as currently maintained by Rosstandart, alongside PUE-7 for electrical installation compliance. Where levels exceed applicable limits, we recommend mitigation such as harmonic filters or relocated power-factor correction capacitance.

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What distorted voltage does to a motor

A motor supplied with distorted voltage produces additional rotor loss, runs hotter, and ages faster. The failures arrive early and are attributed to bearings, insulation or duty rather than to the supply.

What We Deliver

Voltage distortion at the motor terminals

Distortion is measured where the motor actually sits rather than at the incomer, because a long feeder and a distorting neighbour can produce a considerably worse waveform at the machine than at the board.

WHY IT MATTERS

The motor that keeps failing early

A machine that fails repeatedly and always a little sooner than expected is usually treated as a duty or a maintenance problem. Where the supply waveform is the cause, replacing the motor simply restarts the clock.

  • Voltage distortion measured at the motor terminals, since conditions at the incomer can understate what the machine experiences.
  • Unbalance assessed together with distortion, because both produce negative-sequence current and rotor heating through the same mechanism.
  • Winding temperature compared against loading, as a machine hot at modest load is describing its supply rather than its duty.
  • Insulation condition recorded, since accelerated thermal ageing is the pathway from a distorted supply to an early failure.
  • Drive-fed and direct-on-line machines distinguished, as the waveform a drive delivers is a separate question from the supply feeding the drive.
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DELIVERABLES

What you receive

Issued against PUE-7 and GOST R 50571, with the measurement basis and any uncertainty stated.

  1. 1Measured voltage distortion and unbalance at each assessed motor terminal
  2. 2Negative-sequence content with its contribution to rotor heating identified
  3. 3Motor derating assessment where distortion and unbalance are significant
  4. 4Correlation between measured supply conditions and recorded failure history
  5. 5Mitigation options directed at the loads producing the distortion
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How the study runs

01

Review the failure history

We collect what has failed and when, since a pattern of early failures on specific machines is the strongest indicator of a supply cause.

02

Measure at the machines

Voltage distortion and unbalance are recorded at the motor terminals across a representative period, not only at the distribution board.

03

Separate the mechanisms

Negative-sequence content from distortion and from unbalance are distinguished, because the remedies for each are different.

04

Assess the thermal consequence

Measured conditions are translated into a derating and compared against the load the machines actually carry.

05

Attribute the distortion

The spectrum at each feeder identifies which loads are producing the waveform the motors are exposed to.

06

Report and options

Findings link measured supply conditions to the failure history, with mitigation directed at the source rather than at the motors.

Frequently asked questions

Certain harmonic orders produce negative-sequence currents that generate heat in the rotor without contributing useful torque. That additional heating accelerates insulation ageing, and insulation life falls sharply with temperature. The motor does not fail from distortion directly; it fails earlier from heat the distortion caused.
Both act through the same rotor heating mechanism and frequently occur together, so they are assessed together. Unbalance is often the larger contributor and the cheaper to fix, since it usually comes from uneven single-phase load distribution rather than requiring any filtering equipment.
Differently. A drive rectifies the incoming supply, so the motor sees the drive's output rather than the network waveform directly. Supply distortion then affects the drive's DC bus and its own reliability instead. Both are worth measuring, but the failure mechanism and the remedy are not the same.
Not with certainty for a single machine, and we will not claim otherwise. What the study establishes is whether supply conditions are outside what the equipment was specified for, and whether the failure pattern is consistent with that. That is a strong basis for action without overstating what a measurement can prove.

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