The phase-to-phase impedance protection does not set the oscillation blocking criterion, because the action impedance circle is very small, and the delay criterion is used to solve the possible oscillation misoperation problem.
Intersculation impedance protection does not set oscillation latching parameters, because its motion impedance circle is very small, and the delay parameters are used to solve the possible oscillation misalming problem.
The phase to phase impedance protection does not set oscillation blocking criterion, because its action impedance circle is very small. At the same time, the delay criterion is used to solve the problem of oscillation maloperation.<br>