ABB Relion 670 Series Applications Manual page 130

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Differential protection

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

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 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.

IEC05000176 V3 EN-US

Figure 54: Application of the1Ph High impedance differential protection HZPDIF function on a reactor

1MRK 511 401-UEN Rev. K

M16850-118 v5

IEC05000176-3-en.vsd

Bay control REC670

Application manual

Relion rec670