INTERACTIVE ENGINEERING SIMULATORS

GridCircuits
Learning Lab

Go beyond the drawing. Operate virtual breakers, trace control circuits, and find the reason behind every operation.

3 interactive labs16 scenarios100% browser simulation

Training environment. Simplified circuits and example timings. No connection to equipment. Not a switching procedure or a relay-settings guide.

CHOOSE YOUR CHALLENGE

Learn by doing.

Next in the lab Planned, not yet interactiveRelay Logic BuilderSingle-Line TrainerSCADA Operations

YOUR VIRTUAL TEST BENCH

Trace. Test. Understand.

0 of 16 scenarios completed

Trip Circuit Detective

Beginner

SCENARIO

0.000 s

DC trip circuitREADY

Select a labeled component to inspect its role. Select test points to position the virtual meter probes.

Demo pace

THE MISSION

Follow the trip path.

What does the evidence show?

Run the scenario, collect evidence, then choose a diagnosis.

Practice progress stays in this browser. No account, equipment connection, or AI credits are required by this simulator.

Model assumptions, limitations and references

A learning model, not field instructions

The control circuits use an ideal 125 V DC supply measured relative to DC return (0 V), ideal contacts, and a nominal 25-ohm coil. They do not model inductance, heating, arc interruption, battery impedance, dual-pole fusing, trip-circuit supervision or all vendor interlocks. The closing diagram is a functional series-permissive representation; it is not a terminal wiring drawing.

Breaker failure uses a two-source radial bus, one faulted feeder and one healthy load feeder, with no downstream generation. Fault contributions are fixed illustrative values. Only current-based supervision is modeled. Real schemes can use current, position or combined criteria and different trip matrices. Example operation, recharge and timer values are not equipment specifications.

Technical reading

Schneider Electric: maintained close commands and anti-pumping

ABB REX615: breaker-failure supervision and timers

SEL-352: breaker failure, retrip and event recording

These references inform the concepts; they do not certify or endorse this simulator. Training release 1.0.1. Independent engineering review is still required before use in a formal training or qualification program.