IEEE 1584 · Engineering
Load Flow Analysis For A Resilient Power System
Load flow analysis solves the steady-state operating condition of your power system — node voltages, branch power flows, real and reactive power, and line losses — for a specified generation and network configuration. For a Singapore facility this means confirming your network can carry required loads during planned outages without exceeding rated capacity, and identifying where reactive power compensation and transformer tap settings should sit for efficient operation. Carelabs performs the study in ETAP, modelling your network as nodes connected by impedances and solving it iteratively, and delivers findings aligned with SS 638.
Free ConsultationCapacity inside a building that cannot grow
On a constrained site the answer to more load is rarely more space. It is establishing what the existing risers, transformers and switchrooms can actually carry, and where the first real limit sits.
What We Deliver
Loading on every branch
Transformer, riser and busbar loading is reported against rating for each operating case, which identifies the element that will bind first when load is added rather than the one that is easiest to see.
WHY IT MATTERS
Reinforcing the wrong element
Where space and access are limited, an unnecessary transformer upgrade is expensive in ways that go beyond the equipment. Without a model the upgrade is chosen from the most visible asset rather than the one genuinely binding.
- Metered demand analysed across a full operating cycle rather than taken from a single peak, since one reading says nothing about diversity.
- Each switching configuration studied separately, because a network comfortable on the normal arrangement can be constrained on the alternative.
- Motor starting assessed where chillers and large drives exist, as starting current depresses bus voltage for its duration.
- Standby generation modelled as its own case, since generator impedance and capacity differ substantially from the supply.
- Reactive compensation checked for resonance against existing harmonic content before it is recommended rather than after installation.
DELIVERABLES
What you receive
Issued against SS 638 with the load basis and modelling assumptions stated so conclusions can be audited.
- 1Measured demand profile with diversity quantified
- 2Bus voltage table per scenario with deviation from nominal against the applicable limit
- 3Branch loading summary naming every element above rating and the margin on those approaching it
- 4Spare capacity in kVA at the constraining element, for fit-out and expansion decisions
- 5The calibrated ETAP model, so the next tenant or plant change is a re-run
How the study runs
Frame the decision
We establish what must be settled: a fit-out, a plant replacement, or how much load can still be added before reinforcement becomes unavoidable.
Establish real demand
Metered data is collected across a representative cycle and reconciled against connected load, since the gap between them is usually the finding.
Build the model
Transformers, risers and busbars are modelled in ETAP from verified data, with impedances taken from certificates where those exist.
Solve the scenarios
Present operation, maximum demand, alternative switching and planned load are each solved as separate cases.
Name the constraint
The first binding element is identified per case with its remaining margin, which is the number a capacity decision actually requires.
Options and handover
Reinforcement, reconfiguration and compensation options are presented with the constraint each relieves, and the model is handed over.
Frequently asked questions
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