ABB Relion 670 series - Page 215

ABB Relion 670 series

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en00000488-1_ansi.vsd

NDIR_A

NDIR_B

NIDR_C

NDIR_AB

NDIR_BC

NDIR_CA

OR

OR

OR

OR

AND

AND

AND

AND

BLK

PICKUP

PU_C

PU_B

PU_A

ANSI00000488 V2 EN

Figure 95: Composition of pickup signals in non-directional operating mode

Results of the directional measurement enter the logic circuits, when the zone operates

in directional (forward or reverse) mode, as shown in figure 96.

1MRK505222-UUS C Section 6

Impedance protection

209

Technical reference manual

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