4.8.2.3 Functionality
The reverse power/directional overpower protection function 32R/32O can be used for
generator protection against delivering an excessive power beyond the generator's
capacity to the grid, against the generator running like a motor, and against the motor
running like a generator and for protecting a motor which consumes more reactive power
due to loss of field. It can also be used in feeder protection for indicating overload on the
distribution system, to indicate that a customer is supplying power into the grid and for
protecting the transformer from delivering an excessive load.
The function picks ups and trips 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 "Enable" and "Disable".
The operation of 32R/32O can be described by using a module diagram. All the modules
in the diagram are explained in the next sections.
BLOCK
BLK_PICKUP
FR_TIMER
TRIP
PICKUP
Directional
calculation
U3P
I3P
Power
calculation
U_A
U_B
U_C
I_A
I_B
I_C
I1
U1
U_AB
U_BC
U_CA
Level
detector
t
Timer
BLK_TRIP
GUID-7AABB604-0901-4815-841F-352961249261 V1 EN
Figure 361: Functional module diagram
1MAC059074-MB A Section 4
Protection functions
615 series ANSI 725
Technical Manual
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