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Scene 2 • R-X & Mho
These modules build intuition on the impedance plane. Start with how R and X create impedance angle, then see how the Mho element uses that angle to create a pickup region (and how fault type changes what the relay “sees”).
R-X Plane
Z₁ / Z₀ Angle
MTA
Mho Pickup
Fault Type
3-Phase Phasors
Module
Mod 2A • Z₁/Z₀ angles and MTA
Explore how line resistance and reactance create impedance angle, and why distance elements align their Maximum Torque Angle (MTA) with ∠Z₁.
Module
Mod 2B • From Line Angle to Mho Direction
See how the Mho element uses the MTA to form a directional pickup region on the R-X plane. Choose a fault type and watch three-phase voltages and currents change with fault distance.
Tip: If you’re new to the R-X plane, start with Mod 2A. If you’re comfortable with impedance angle, jump straight to Mod 2B.