ABB RELION 670 SERIES Applications Manual page 446

Line distance protection

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Impedance protection

ANSI05000283 V1 EN

Impedance diagrams with corresponding impedances under

consideration

The outer boundary of oscillation detection characteristic in forward direction RLdOutFw

should be set with certain safety margin K

resistance R

. When the exact value of the minimum load resistance is not known, the

following approximations may be considered for lines with rated voltage 400 kV:

compared to the minimum expected load

Line distance protection REL670 2.2 ANSI

1MRK 506 369-UUS -

Application manual