Answer / thowsif_emerson

The first-pole-to-clear-factor (kpp) is dep
The first-pole-to-clear-factor is used for calc
three-phase faults. In general the following cases apply: -
kpp = 1.3 corresponds to three phase faults in systems with
an earthed neutral. - kpp = 1.5 corresponds to three phase
faults in isolated
- kpp = 1.0 corresponds to special cases, e.g. two-phase
railway systems.
arth in a syst
A special case is when there is a three-phase fault without
involving e
not normally considered in the standards.

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