IEEE 1584 · Engineering

Power System Study & Analysis - Carelabz Ukraine

Power system study and analysis solves the power flow equations that govern your electrical network, verifying that generators, lines, transformers, and shunt elements perform as intended, withstand expected stress, and are protected against failures. For a Ukrainian facility this brings together load flow analysis, short-circuit and fault analysis, and relay coordination into one connected study. Carelabs performs the full study in ETAP and delivers findings aligned with PUE.

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What you can run, and on what

Operating on a reduced or alternative supply is a planning problem rather than an improvisation. The study establishes which loads can be carried, in what combination, and what has to stay off.

What We Deliver

Capacity under each supply arrangement

Loading and voltage are calculated for the full supply, for any reduced arrangement, and for standby generation, so the carrying capacity of each is a known figure rather than an estimate made under pressure.

WHY IT MATTERS

Decisions made during the outage

Without a prepared schedule, load shedding and restoration get decided by whoever is present. The result is inconsistent, frequently exceeds what the available supply can carry, and is rarely recorded afterwards.

Capacity of each supply arrangement established by calculation rather than by assumption about what the source can deliver.
Generator parameters modelled from the machine's own data, since impedance and prime mover response govern both voltage and frequency behaviour.
Grading verified per supply arrangement, because decaying generator contribution can leave a downstream fault uncleared.
Restart sequencing assessed, as simultaneous re-energisation of several large loads can collapse a limited supply.
Undervoltage and under-frequency settings checked, so protection intended to shed load does not instead prevent a legitimate restart.

DELIVERABLES

What you receive

Issued against PUE and DBN V.2.5, with the load basis and source characteristics stated explicitly.

1Carrying capacity of each supply arrangement, stated in kVA
2A prioritised load schedule matched to the capacity available under each arrangement
3Bus voltage and branch loading per arrangement, including generator supply
4Grading assessment per source with any failing pair identified
5A documented restart sequence where simultaneous restoration is not achievable

Reach Out

How the study runs

Establish the arrangements

We record every supply configuration the site can operate in, including reduced arrangements and standby generation, with the loads each is intended to carry.

Model the sources

Each source is modelled with real parameters, including generator impedance and prime mover response rather than nameplate capacity alone.

Calculate what each carries

Loading and voltage are solved per arrangement, which produces the capacity figure a load schedule has to be built against.

Prioritise the load

Loads are grouped by priority against available capacity, with your operations team deciding the priorities rather than the engineer assuming them.

Verify protection per source

Grading is checked in each arrangement, since a scheme selective on full supply may not discriminate on a reduced one.

Document the procedure

The schedule and restart sequence are issued as a procedure that can be followed during an outage rather than reconstructed each time.

Frequently asked questions

The priorities are yours; the capacity is calculated. The study establishes what each supply arrangement can actually carry, and your operations team decides which loads matter most. The output is a schedule matched to real capacity rather than a list assembled on the assumption that the generator will cope.

Because fault current differs substantially between them. A generator's contribution is much lower than the utility's and decays within seconds, so current available to operate a downstream device late in a fault can fall below its pick-up. Grading correct on full supply can leave a fault uncleared on a reduced one.

Because everything energises at once. Transformer magnetising inrush and motor starting current arrive together, producing combined current far above normal load that can operate protection or collapse a limited supply. A staggered sequence, established in advance, is what makes restoration repeatable.

Not for the analysis, which is done offline from data captured on site. Verifying protection settings at the device or testing a changeover sequence may need an outage, and that is scoped and agreed before mobilising rather than raised during the visit.

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