IEEE 1584 · Engineering

Power System Study and Analysis in Spain | Carelabs

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

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One verified model, several answers

Load flow, short circuit and protection coordination all depend on the same network model. Capturing and verifying that network is the expensive part, and it is worth doing once.

What We Deliver

Load flow: can the network carry it

Bus voltages and branch loading are calculated under each operating case, which identifies the element that binds first. That is routinely a feeder or a switching arrangement rather than the incoming transformer everyone assumes.

WHY IT MATTERS

Three questions, one network

Commissioned separately, each of these studies pays again for the same site survey and the same data reconciliation. Run together against one verified model, the incremental cost of the second and third answer is small.

Single line diagram reconciled against the installation as built, since drawing sets typically describe the plant as it was at handover rather than as it is now.
Fault level obtained from the distribution company for the point of supply, in both maximum and minimum conditions.
Demand established from metered data where it exists rather than from connected load, because the gap between those two is where poor capacity decisions begin.
Protection settings read from the installed devices rather than transcribed from the schedule, which diverges over the life of an installation.
Results cross-checked between studies, since a change that relieves a load flow constraint can worsen a fault duty or a grading margin.

DELIVERABLES

What you receive

A combined report against REBT, IEC 60909 and IEEE practice, issued by the engineer who carried out the site work.

1Reconciled single line diagram reflecting the installation as it actually exists
2Bus voltage and branch loading per operating scenario, with the binding constraint named
3Fault duty per bus with pass or fail against installed equipment ratings
4Grading curves and a discrimination register identifying any failing pairs
5The calibrated ETAP model, so future questions are answered in days rather than weeks

Reach Out

How the study runs

Agree the questions

We establish what has to be decided, since a capacity application, a discrimination complaint and an equipment adequacy review need different emphasis from the same model.

Survey and reconcile

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

Gather source and load data

Fault level, transformer certificates, cable schedules, protection settings and metered demand are collected as the basis of the model.

Build and validate

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

Solve the three studies

Load flow, short circuit and coordination are run against the same model, with results cross-checked for conflicts between recommendations.

Report and hand over

Findings are ranked by consequence, options are costed, and the model is handed over with a walkthrough for your engineering team.

Frequently asked questions

Usually yes. They share a network model, and capturing and verifying that network is the largest part of the cost. Running them together also surfaces conflicts, such as a protection setting that improves discrimination while worsening arc flash energy, which separate studies by different parties routinely miss.

It is normal and it is not a blocker. Part of the work is reconciling the single line diagram against the installation, and the corrected diagram is itself a deliverable. It does affect survey duration, so it is better raised at quoting stage than discovered on site, where it becomes a variation.

Not for the analysis, which is performed offline from data captured on site. An outage is required only where protection settings must be verified at the device or panels must be opened to confirm nameplate data that records do not cover. Any outage requirement is scoped before mobilising.

The calibrated ETAP model, which is the deliverable with the longest life. With it retained, the next expansion, transformer change or capacity query is a short re-run against a verified network rather than a fresh engagement that repeats the whole survey.

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