customer is supplying power into the grid and for protecting the transformer from
delivering an excessive load.
The function starts and operates when the measured power exceeds the set limit
and in a specified direction. The operate time characteristics are according to
definite time (DT).
This function contains a blocking functionality. It is possible to block the function
outputs, timer or the function itself, if desired.
4.8.2.4 Operation principle
The function can be enabled and disabled with the
Operation
setting. The
corresponding parameter values are "On" and "Off".
The operation of DOPPDPR can be described using a module diagram. All the
modules in the diagram are explained in the next sections.
Figure 382: Functional module diagram
Power calculation
This module calculates the apparent power based on the selected voltages and
currents. The
Measurement mode
setting determines which voltages and currents
are used. It is also possible to use positive-sequence components for calculating
the apparent power which makes the determination of power insensitive to a
possible asymmetry in currents or voltages and corresponds to the real load on
the prime mover of the generator.
Protection functions
1MRS757644 H
736 620 series
Technical Manual
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