Load an IEEE test system preset and run steady-state analysis.
In SLD view, double-click a line to outage/restore it and watch the flows redistribute.
N-1 ContingencyFull AC re-solve of every outage
Contingency ScreenRanked flow prediction, top cases verified
Short CircuitFault current at each bus
DC-OPFLinear dispatch at minimum cost
AC-OPFAC dispatch: a bound, then verification
Harmonic ScanDriving-point impedance per bus
Harmonic THDVoltage THD vs IEEE 519
Load an IEEE Common Data Format case — choose a file, or paste the text for a small hand-typed one. The import reports anything it had to drop or repair.
Choose a CDF file
Import CDF
Load a PSS/E .raw case (revisions 32 and 33). A real case is far too large to paste, so choose the file — the textarea is for small hand-typed cases. The import is lossy by construction and lists everything it dropped.
Choose a .raw file
Import PSS/E case
Load a PowerFactory .dgs interchange case (the ASCII export — a .pfd project archive cannot be read). The import is lossy by construction , lists everything it dropped, and says when the file does not designate a reference bus and what it chose instead.
Choose a .dgs file
Import PowerFactory DGS
Map
The map is a geographic editor of the power system. Click a bus or line to select it, arm Drag bus to move the selected bus, Add bus then click the map to drop a new one, or Add branch then drag from one bus to another to connect them. The real OpenStreetMap power grid shows underneath, and solved flows animate along the lines.
Fit map
Add bus
Add branch
Drag selected bus
Replace system with demo
Offline note
The power system is stored with localStorage in the browser and persists offline after the page has loaded. OpenStreetMap tiles still depend on network access or browser cache.
Live results
(bus ring)
Double-click a line: outage / restore. Without a mouse: pick the branch in the editor's Branches list and toggle In service .
The single line diagram is a picture of the Power System. Every element it draws is also listed in the editor panel, where a bus, branch, generator or load can be reached and changed with the keyboard. To take a line out of service without a mouse, select it in the Branches list and toggle the In service checkbox.