32 Power Protection
Overview of Function
Power protection is used to:
•
Detect whether the active, reactive or apparent power rises above or drops below a set threshold
•
Monitor agreed power levels and limits and provide output status indications
•
Detect both active and reactive power levels in the power systems or on electric machines
•
Detect loss of motor load and initiate shutdown
•
Detect low output or active power consumption from embedded generation and initiate disconnection
from the power system. Generator no-load operation e.g. overspeed or plant operating characteristics
must be considered
Structure of the Function
The power protection function elements have group dependent settings. These settings can be different in
each settings group – group numbers (Gn) 1 to 4.
This function corresponds to the logical node A32PDOP* in IEC 61850.
The function monitors the primary system using the 3 phase current inputs e.g. CT1/2/3 and 3 phase VT inputs
e.g. VT1/2/3. Function operation is selected to single phase or 3 phase power measurements.
5.4
5.4.1
5.4.2
Protection and Automation Functions
5.4 32 Power Protection
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual 163
C53000-G7040-C014-1, Edition 11.2019
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