Implementation Of The Reverse Power Protection - Siemens 7SK80 Manual

Functions
2.16 Reverse-Power Protection Application with Flexible Protection Function
Figure 2-86
2.16.2

Implementation of the Reverse Power Protection

General
The names of messages can be edited in DIGSI and adjusted accordingly for this example. The names of the
parameters are fixed.
Determination of the Reverse Power
The reverse power protection evaluates the active power from the symmetrical components of the fundamental
harmonics of the voltages and currents. The evaluation of the positive sequence systems causes reverse
power determination to be independent of the asymmetries in currents and voltages and reflects the real load
of the driving end. The calculated active power value corresponds to the total active power. The connection in
the example illustrates positive measurement of power in the direction extending from the busbar to the trans-
former of the device.
240
Wiring diagram for a 7SK80 as reverse power protection
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012