What can this calculator do?

Pick a load case and press Run: the simulator solves the network iteratively and gives the bus voltages, the branch flows, the cable loading and the transformer tap detail, with the node-voltage and branch-loading charts drawn from that solution and a diagnostics panel reporting the iterations, the residual and the time taken. Typical uses: checking that no bus is out of band at the load case you expect, seeing which branch is the binding constraint, and reading the transformer tap position the solution implies. Where the solution does not converge the page says which case failed and what can be tried, instead of showing numbers.

What is the basis of the solution?

An iterative network solution over the scheme topology, one run per load case, with bus voltages, branch flows, cable loading and transformer tap detail all taken from that solution. The diagnostics panel exposes the iteration count, the residual and the solve time, so the quality of the answer is visible and not just the answer.

What happens when the network does not converge?

The page reports why the result is unusable and what can be tried, and the values read as unavailable instead of zero — a non-converged case is never dressed up as a solved one. Missing-input warnings and build alarms are listed separately, so a data gap is not mistaken for a network problem.

Power flow & voltage

Iterative network solution, bus voltages and cable loading

Step 1 of 3Power flow & voltage

Pick a scheme first — then this column can calculate

This column runs the real engine on your project scheme, and there is none yet — that is why no calculation buttons are shown here (they are not broken). Start with any of the ways below; the fastest is the built-in example (one click, real parameters).

① Load a real example scheme (fastest)

10 kV incoming (200 MVA short-circuit level) → 1250 kVA transformer (Dyn11) → LV main switchboard → busbar → 5 feeders plus a fire/emergency ATS branch. 1000 kW calculated load, cosφ 0.85, power-factor target 0.95.

Load the real example scheme and start calculating →

Or pick a ready-made scheme in the scheme library →

The scheme and its parameters go straight into your browser; replace the data with your own at any time.

Calculator mode

Calculator mode computes the few outputs that only depend on parameters you type in yourself. Anything that genuinely needs the whole system (full-network load flow, coupling with other devices) is shown as “needs a scheme” and no number is given.

Calculator mode is not available for this column yet — use one of the ways below.

Nothing is pre-filled and nothing is invented: leave a required field empty and the result area says “unavailable”.

② Or build your own scheme

In the studio, place devices, wire them and pick models — that becomes your project scheme (drawings / BOM / report can be exported).

Open the studio →

Need a hand?

Use the chat bubble bottom-right, or Contact us — we will set the example to your site parameters.

Note: every number comes from the engine. With no scheme, nothing is invented here.

Frequently asked questions

What can this calculator do?: Pick a load case and press Run: the simulator solves the network iteratively and gives the bus voltages, the branch flows, the cable loading and the transformer tap detail, with the node-voltage and branch-loading charts drawn from that solution and a diagnostics panel reporting the iterations, the residual and the time taken. Typical uses: checking that no bus is out of band at the load case you expect, seeing which branch is the binding constraint, and reading the transformer tap position the solution implies. Where the solution does not converge the page says which case failed and what can be tried, instead of showing numbers.
What is the basis of the solution?: An iterative network solution over the scheme topology, one run per load case, with bus voltages, branch flows, cable loading and transformer tap detail all taken from that solution. The diagnostics panel exposes the iteration count, the residual and the solve time, so the quality of the answer is visible and not just the answer.
What happens when the network does not converge?: The page reports why the result is unusable and what can be tried, and the values read as unavailable instead of zero — a non-converged case is never dressed up as a solved one. Missing-input warnings and build alarms are listed separately, so a data gap is not mistaken for a network problem.