When applying over-current protection, for example ... on Developments in ower System Protection, “A new digital relay for loss of grid to protect embedded generation”, 127 -130 DEFU, 1995, ...

Notably, the operation of on-load tap-changers (OLTCs) can lead to the maloperation of overcurrent relays during both internal and external faults due to the altered fault current levels. This issue, ...