the metrosil curve with√2. Use the value from the maximum metrosil curve given
in Figure 54
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
M16850-118 v5
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 can be used to protect the
tertiary reactor for phase faults as well as earth faults if the power system of the
tertiary winding is direct or low impedance earthed.
Section 7 1MRK 506 369-UEN B
Differential protection
142 Line distance protection REL670 2.2 IEC
Application manual
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