ABB RELION REX640 Technical Manual page 1286

Protection related functions
5.15.1 Identification
Function description
Neutral power directional element
5.15.2 Function block
Figure 728: Function block
5.15.3 Functionality
Neutral power directional element function DNZSRDIR is used to detect negative or
residual power direction. The output of the function is used for blocking or releasing
other functions in protection scheme.
In negative-sequence voltage selection, if the angle difference between
negativesequence voltage and negative-sequence current is in a predefined
direction (either in forward or reverse direction), DNZSRDIR gives a release signal
after a definite time delay.
In residual voltage selection, if the angle difference between residual voltage and
residual current is in a predefined direction (either in forward or reverse direction),
DNZSRDIR gives release signal after a definite time delay.
This function contains a blocking functionality which blocks the function output and
resets Timer.
5.15.4 Analog channel configuration
DNZSRDIR has four analog group inputs which must be properly configured.
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DNZSRDIR executes on the direction of either negative-sequence or zero-
sequence power and not the value. The function is generally used for
directional controls.
IEC 61850 IEC 60617
identification identification
DNZSRDIR I2->, Io->
1MRS759142 F
ANSI/IEEE C37.2
device number
67N-TC
REX640
Technical Manual