Power Systems Lab · 18 modules · all computed in your browser
Click-to-fault single-line diagrams, six topologies incl. ring bus, line charging, vector groups, weak-infeed echo, multi-shot reclosing, exact phase-domain solution, oscillography, R-X trajectories, pilot schemes, 87L, 50BF, autoreclose, SER and COMTRADE export.
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Guided scenario
An A–G fault at mid-line. POTT keys at both ends, phase selection (angle of I2 against I0) picks A, only pole A opens, the secondary arc dies and pole A recloses after 1 s.
What to look at: In the scope, Ia goes to zero at a current zero while Ib and Ic keep carrying load. 3I0 flows during the open-pole interval and is ignored by the SPO logic.
Single-line diagram · Two-source line · 230 kV · state at cursor
Station A ⇄ Station B, bus protection at both ends and a YNd load transformer at B. Click a line, bus or transformer to place the fault; click a 52 or 89 to switch it before the event. Power flow animates at the cursor time.
Fault
If (sim)
0.00 kA
X/R → τ
–
Sources & load
Source A
Source B
Protection settings