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Carelabs

IEEE 1584 · Engineering

Power System Study & Analysis - Carelabz Slovakia

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 Slovak 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 STN 33 2000.

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A study that does not go out of date

Most system studies are accurate on the day they are issued and steadily less so afterwards. What determines whether the work keeps its value is whether the model is maintained or filed.

What We Deliver

The model as a deliverable

The calibrated ETAP model is handed over rather than retained by the consultant, which is what allows a future change to be assessed in days instead of commissioning a fresh study.

WHY IT MATTERS

A study describing a plant you no longer have

An old study carries the authority of a calculation while describing a network that has since changed. That is more dangerous than no study, because decisions get taken on it without anyone questioning whether it still applies.

  • Single line diagram reconciled against the installation as built, which is the baseline everything else depends on.
  • Every input recorded with its source and date, so a later change can be traced to the results it affects.
  • Fault level obtained from the network operator with the date of the figure noted, since operators reinforce networks and the value moves.
  • Protection settings recorded as found, giving a dated baseline even where no change is recommended.
  • Change triggers documented and handed to the people who authorise modifications, not only to the engineering file.
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DELIVERABLES

What you receive

Issued against STN 33 2000 and IEC 60909, with the model and its full assumption register handed over.

  1. 1Reconciled single line diagram reflecting the installation as it exists
  2. 2Fault duty, load flow and grading results with the date and source of every input
  3. 3The calibrated ETAP model, transferred in a form your team or any consultant can use
  4. 4An assumption register identifying which results each input affects
  5. 5A documented change-trigger list for issue to whoever authorises modifications
Reach Out

How the study runs

01

Survey and reconcile

A lead engineer walks the installation and reconciles the single line diagram against it, recording discrepancies for the drawing set.

02

Capture inputs with provenance

Every figure is recorded with its source and date as it is collected, rather than reconstructed afterwards when the detail has been lost.

03

Build and validate

The network is modelled in ETAP and validated against measured conditions, so results describe the installation rather than an idealisation.

04

Solve the studies

Load flow, fault duty and grading are run against the one model, with results cross-checked for conflicting recommendations.

05

Document the dependencies

Each input is linked to the results it affects, which is what makes a future partial update possible rather than a full re-run.

06

Hand over and brief

The model, assumptions and change triggers are transferred with a walkthrough, so your team can maintain them rather than only read them.

Frequently asked questions

Until one of its inputs changes, which is why a calendar interval is the wrong way to think about it. A supply reinforcement, transformer replacement, added generation, switchboard extension or protection setting change each invalidate part of the result immediately. Absent any of those, three to five years is a reasonable review point.
Because it is the difference between updating a study and commissioning a new one. Capturing and validating the network is the largest part of the cost, so where the model is retained a future question is answered in days. Where the consultant keeps it, the survey is repeated and paid for again.
For straightforward changes, frequently yes, provided the assumptions are documented and the handover includes a walkthrough. More substantial changes to protection or fault levels are usually better verified independently, but a team that can update loading and equipment data keeps the model current between engagements.
Then the network has to be captured again, which is the main cost. It is worth checking what exists first, since even incomplete data and a reconciled drawing set reduce the survey. The outcome is a model you retain this time, so the situation does not repeat at the next change.

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