ABB RET670 Applications Manual page 158

Section 3
IED application
152
The magnetizing current is taken from the magnetizing curve for the current
transformer cores which should be available. The value at TripPickup is taken.
Tertiary reactor protection
For many transformers there can be a secondary system for local distribution and/or
shunt compensation. The 1Ph High impedance differential protection function HZPDIF
(87) can be used to protect the tertiary reactor for phase as well as ground faults if the
grounding is direct or low impedance.
1MRK504116-UUS C
Application manual