1 APPLICATION AND SCOPE
1.1 Overview - P631
The P631 differential protection device is intended for the fast and selective
short-circuit protection of transformers, motors, generators and other
installations with 2 windings.
Fig. 1-1: P631 in 40 TE case.
The P631 provides high-speed three-system differential protection using a triple-
slope characteristic and two high-set differential elements in combination with
transformer inrush restraint, overfluxing restraint and through-stabilization.
Amplitude and vector group matching is done just by entering the nominal values
of transformer windings and associated current transformers. An (optional)
overreaching current measuring circuit monitoring function will prevent
unwanted tripping by differential protection for faults in the CT's secondary
circuit.
Phase swapping allows motor / generator protection applications with enlarged
protection zones.
In addition many supplementary protective functions are incorporated in the
devices. These can be individually configured and cancelled.
The relevant protection parameters can be stored in four independent parameter
subsets in order to adapt the protection device to different operating and power
system management conditions.
During operation, the user-friendly interface makes it easy to set the device
parameters and allows safe operation of the substation by preventing non-
permissible switching operations.
These features give the user the means to adapt the P631 to the protection and
control capacity required in a specific application.
The powerful programmable logic provided by the protection device also makes
it possible to accommodate special applications.
P631
P631/EN M/R-11-C // P631-310-650 1-1
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