4.8.3 Directional reactive power undervoltage protection
DQPTUV (ANSI 32Q,27)
4.8.3.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Directional reactive power under-
voltage protection
DQPTUV Q> ->,3U< 32Q,27
4.8.3.2 Function block
Figure 598: Function block
4.8.3.3 Functionality
The directional reactive power undervoltage protection function DQPTUV 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.
DQPTUV 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).
DQPTUV contains a blocking functionality to block function outputs, timer or the
function itself.
4.8.3.4 Analog channel configuration
DQPTUV has two analog group inputs which must be properly configured.
Table 1009: Analog inputs
Input Description
I3P Three-phase currents
U3P Three-phase voltages
See the preprocessing function blocks in this document for the possible
signal sources.
There are a few special conditions which must be noted with the configuration.
Protection functions
1MRS759142 F
1072 REX640
Technical Manual
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