IEEE 1584 · Engineering

Power System Study and Analysis in Greece

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 Greek 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 ELOT HD 384.

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Supporting the connection you are applying for

A new connection, a capacity increase or a generation application is assessed on technical submissions. A verified model is what turns that submission from an estimate into a calculated position.

What We Deliver

A demand position you can submit

Required capacity is derived from measured demand and diversity rather than from summed connected load, which overstates requirement and leads to applications that are larger and more expensive than the site needs.

WHY IT MATTERS

The application that has to be redone

Applications built on connected load and assumed fault levels are frequently returned for clarification or produce a connection sized wrongly. Both outcomes cost more time than the modelling would have.

Single line diagram reconciled against the installation as built, since drawings usually describe the plant at handover rather than after successive extensions.
Fault level obtained from the network operator for the point of supply, in maximum and minimum conditions.
Demand established from metered data rather than connected load, because the difference between them is where over-sized applications originate.
Any planned generation modelled with its real fault contribution, including the decay characteristic that determines whether downstream protection still operates.
Results cross-checked between studies, since a change that relieves a loading constraint can worsen a fault duty or a discrimination margin.

DELIVERABLES

What you receive

A combined report against ELOT HD 384 and IEC 60909, issued by the engineer who performed the site work.

1Reconciled single line diagram reflecting the installation as it exists and as proposed
2Calculated demand with diversity, in the form a connection application requires
3Fault duty per bus with pass or fail against installed equipment ratings
4Bus voltages across operating cases, demonstrating compliance under the proposed arrangement
5The calibrated ETAP model, so subsequent changes are assessed rather than reapplied for blind

Reach Out

How the study runs

Define the application

We establish what is being sought: a new connection, a capacity increase, a generation connection, or approval for an extension to an existing installation.

Survey and reconcile

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

Establish demand and source

Metered demand, diversity and the network operator's fault level are collected as the basis for both the model and the submission.

Model present and proposed

The network is built in ETAP in its current form and in the proposed form, so the effect of the change is isolated rather than inferred.

Solve and cross-check

Load flow, short circuit and coordination are run for both cases, with results checked for conflicts between recommendations.

Issue for submission

Findings are presented in a form that supports the application, with the calculation basis stated so the submission can be reviewed rather than merely accepted.

Frequently asked questions

A demand figure derived from measurement and diversity rather than summed connected load, and an understanding of what the increase does to fault levels. Applications built on connected load tend to request more capacity than the site needs, which carries a standing cost, and they are more likely to be queried.

Frequently, and it is commonly overlooked. A stronger supply raises the fault current your switchgear must interrupt, so equipment adequate on the present connection can become under-rated afterwards. Fault duties should be recalculated as part of the application rather than discovered once the new supply is energised.

Yes. Generation contributes to faults, raising fault duty, and it allows current to flow in directions the original grading did not anticipate, so discrimination may no longer hold. Protection should be reassessed for the network as it will exist after the connection rather than as it exists now.

No, and it is the usual starting position. Reconciling the single line diagram against the installation is part of the work, and the corrected drawing is itself a deliverable. It affects survey duration, so it is better raised when quoting than discovered on site where it becomes a variation.

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