4.4.2.3
Functionality
Ground directional power protection 32N 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 negative-
sequence voltage and negative-sequence current is in a predefined direction (either in
forward or reverse direction), 32N 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), 32N gives
release signal after a definite time delay.
This function contains a blocking functionality which blocks the function output and
resets Timer.
32N executes on the direction of either negative-sequence or zero-
sequence power and not the value. 32N is generally used for directional
controls.
4.4.2.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The corresponding
parameter values are “Enable” and “Disable”.
The operation of 32N can be described with a module diagram. All the modules in the
diagram are explained in the next sections.
1MRS240050-IB C
Section 4
Protection functions
REF615R
287
Technical Manual
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