ABB 615 Series - Function Block

4.8.3.2 Function block
V_AB
V_BC
V_CA
V
1
32Q-27
TRIP
I
1
BLOCK
PICKUP
GUID-2C0FEE94-AF1B-4C4E-9DE2-9D1164E19992 V1 EN
Figure 366: Function block
4.8.3.3 Functionality
The directional reactive power undervoltage protection function 32Q-27 is used at the grid
connection point of distributed power generating units as stipulated by various grid codes
to prevent voltage collapse of the grid due to network faults. 32Q-27 measures phase
voltages and current at the grid connection point. The generating facility is disconnected
from the network with a specific time delay if all phase voltages decrease and remain at
or below the specified limit and if reactive power is simultaneously consumed (that is,
under-excitation operation).
The function contains a blocking functionality to block function outputs, timer or the
function itself.
4.8.3.4 Operation principle
The function can be enabled and disabled with the Operation setting. The corresponding
parameter values are "Enable" and "Disable".
The operation of 32Q-27 can be described using a module diagram. All the modules in the
diagram are explained in the next sections.
Section 4 1MAC059074-MB A
Protection functions
734 615 series ANSI
Technical Manual