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Carelabs

IEEE 1584 · Engineering

Power System Study & Analysis in Italy | 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 an Italian 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 CEI 64-8.

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A model that keeps up with the installation

Self-consumption generation, added production capacity and distributor reinforcement all change how the network behaves under fault and under load. A verified model is what keeps those changes from accumulating unexamined.

What We Deliver

Load flow across real operating cases

Bus voltages and branch loading are calculated for each configuration the plant actually runs, which identifies the element that binds first. That is regularly a feeder or a switching arrangement rather than the incoming transformer.

WHY IT MATTERS

Generation changes the fault picture

An installation that adds photovoltaic or cogeneration capacity has changed its fault current, its protection behaviour and its earthing conditions. Each of those was verified against a network that no longer exists.

  • Single line diagram reconciled against the installation as built, since drawings typically describe the plant at handover rather than after successive extensions.
  • Fault level obtained from the distributor for the point of delivery, in both maximum and minimum conditions.
  • On-site generation modelled with its real contribution, including the decay characteristic that determines whether downstream protection still operates late in a fault.
  • Protection settings read from installed devices rather than transcribed from the schedule, which diverges over the life of an installation.
  • Results cross-checked between studies, because a change that relieves a loading constraint can worsen a fault duty or a discrimination margin.
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DELIVERABLES

What you receive

A combined report against CEI 64-8 and IEC 60909, issued by the engineer who performed the site work.

  1. 1Reconciled single line diagram reflecting the installation as it exists
  2. 2Bus voltage and branch loading per operating case, with the binding constraint named
  3. 3Fault duty per busbar with pass or fail against installed equipment ratings, with generation included
  4. 4Grading curves and a discrimination register identifying any failing pairs
  5. 5The calibrated ETAP model, so the next change is assessed rather than assumed
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How the study runs

01

Agree the scope

We establish what must be decided, since a generation connection, a capacity increase and a discrimination complaint need different emphasis from the same model.

02

Survey and reconcile

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

03

Gather source, load and generation data

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

04

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.

05

Solve and cross-check

Load flow, short circuit and coordination are run against one model, with and without generation, and results are checked for conflicting recommendations.

06

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

Three things. Fault current rises because the generation contributes to faults, so switchgear adequacy should be rechecked. Protection may no longer discriminate, since current can flow in directions the original grading did not consider. And the network impedance changes, which can move any resonance between capacitors and the transformer.
Verification under DPR 462/2001 examines the earthing installation and protection against indirect contact at defined intervals. A power system study models fault loop impedance and protection operation as part of the same network, so the two are complementary: the study explains why the measured values are what they are.
Generally yes. They share a network model, and capturing and verifying the network is the largest component of cost. Running them together also surfaces conflicts between recommendations, such as a setting change that improves discrimination while raising arc flash energy, which separate engagements routinely miss.
No, and it is the normal starting position. Reconciling the single line diagram against the plant is part of the work and the corrected diagram is itself a deliverable. It does affect survey duration, so it is better raised when quoting than discovered on site where it becomes a variation.

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