It can clearly be seen that the sensitivity is not so much influenced by the selected voltage
level so a sufficient margin should be used. The selection of the stabilizing resistor and the
level of the magnetizing current (mostly dependent of the number of turns) are the most
important factors.
7.1.4.4 Tertiary reactor protection
Reactive power equipment (for example shunt reactors and/or shunt capacitors) can be
connected to the tertiary winding of the power transformers. The 1Ph High impedance
differential protection function HZPDIF (87) can be used to protect the tertiary reactor for
phase faults as well as ground faults if the power system of the tertiary winding is direct
or low impedance grounded.
Section 7 1MRK 506 369-UUS -
Differential protection
148 Line distance protection REL670 2.2 ANSI
Application manual
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