ABB RELION REX640 - 5.15.2 Function block; 5.15.3 Functionality; 5.15.4 Analog channel configuration

5.15.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Neutral power directional element DNZSRDIR I2->, Io-> 67N-TC
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.
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.
5.15.4 Analog channel configuration
DNZSRDIR has four analog group inputs which must be properly configured.
Protection related functions
1MRS759142 F
1286 REX640
Technical Manual