Engineering
Key Insights from Load Flow Analysis
What you can learn about your power system from a thorough load flow study.
Read MoreLOAD FLOW · UNITED STATES
Load Flow Analysis for US Industrial Facilities
Load flow is the study every other power system study is built on. It establishes steady-state voltage at each bus, how heavily transformers and conductors are loaded, and where capacity actually exists. In the United States it is also the study that exposes whether your single-line drawings still describe the plant you own.
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What a Load Flow Study Establishes
The output is a validated model. Everything downstream, from short circuit to arc flash, inherits whatever is wrong with it.
What We Deliver
Voltage profile across the system
Steady-state voltage at every bus under the load conditions that matter, including the worst-case combination rather than a nominal design case. ANSI C84.1 service and utilisation voltage ranges are the usual reference.
WHAT GOES WRONG
Where Load Flow Studies Mislead
A load flow is easy to produce and easy to produce wrongly. The failures are almost always inputs, and they are invisible in the output unless someone checks the model against the plant.
- Single-line diagram taken from drawings and never verified on site.
- Utility service data assumed rather than obtained from the serving utility.
- Only the design load case run, with no worst-case combination.
- Conductor lengths estimated, which distorts voltage drop across long runs.
- Standby generation and transfer schemes excluded from the model.
- Results reused years later without checking what has been added since.
THE OUTCOMES
What the Report Contains
The report hands back a validated model as well as a set of results, because the model is the asset: it is what makes the next study cheaper and the one after that possible.
- 1Single-line diagram verified against the installation
- 2Bus voltages under each load case modelled
- 3Transformer and conductor loading against rating
- 4Available headroom for planned additions
- 5Load cases run, with the assumptions behind each
- 6The model itself, for reuse in later studies
How We Run a US Load Flow Study
01
Obtain utility service data
Request service voltage, available fault current and transformer data in writing from the serving utility rather than inferring it from the switchgear.
02
Verify the single line
Walk the installation and reconcile the drawings against what is installed, recording conductor sizes, lengths and actual equipment ratings.
03
Establish load cases
Define the load combinations worth modelling, including worst case rather than design case, and any standby or transfer configuration.
04
Model and validate
Build the model, run each case, and resolve non-convergence or implausible results as data problems before accepting any output.
05
Report and hand over the model
Results, headroom and assumptions, with the validated model so short circuit and coordination can build on it rather than start again.
Industries We Empower
Oil & Gas
Upstream, midstream, and downstream facilities
Healthcare
Hospitals, clinics, and medical campuses
Data Centers
Tier I through Tier IV facilities
Manufacturing
Production lines and industrial plants
Utilities
Generation, transmission, and distribution
Commercial Real Estate
Office buildings and retail complexes
Education
Universities, schools, and research labs
Government
Federal, state, and municipal facilities
Frequently Asked Questions
Steady-state voltage at each bus, how heavily transformers and conductors are loaded, and where capacity exists. The commercial question behind it is usually whether an existing service can take a planned addition. It also establishes the validated model that short circuit, protection coordination and arc flash studies are built on.
Because single-line drawings are frequently out of date, and a load flow built from inaccurate drawings produces confident numbers about a plant that does not exist. Conductor lengths in particular are often estimated, and they drive voltage drop on long runs. Verification against the installation as found is what makes the result usable.
Yes, and in that order. Load flow establishes and validates the model. Short circuit gives fault levels from it. Coordination sets clearing times from those. Arc flash incident energy follows from fault level and clearing time. Running them out of order, or from separate models, is why results from different studies often fail to reconcile.
Whenever load or configuration changes materially: a new production line, a service upgrade, added standby generation, or a utility change to the supply. The model is reusable, so updating an existing one is considerably cheaper than commissioning a fresh study, provided the original was validated against the plant.
Build the Model Once, Use It for Every Study After
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