Tertiary Reactor Protection - ABB RELION 670 SERIES Applications Manual

Line distance protection

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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 factors.

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.

1MRK 506 369-UUS -

Line distance protection REL670 2.2 ANSI

Application manual