Directional Negative-Sequence Overcurrent Protection Dnspdoc; Identification; Function Block; Functionality - ABB RELION REX640 Technical Manual

1MRS759142 C
4.4.2
4.4.2.1
4.4.2.2
4.4.2.3
4.4.2.4
REX640
Technical Manual
Directional negative-sequence overcurrent protection
DNSPDOC

Identification

Function description
Directional negative-sequence
overcurrent protection

Function block

GUID-725D5512-14E0-401C-AB19-5B6D816ADB0C V1 EN
Figure 408: Function block

Functionality

The directional negative-sequence overcurrent protection function DNSPDOC is
used as directional overcurrent and short-circuit protection.
DNSPDOC starts up when the fundamental value of the operating quantity (negative-
sequence or residual current) exceeds the set limit and the directional criterion is
fulfilled. The operate time characteristic is according to definite time (DT).
The function contains a blocking functionality. It is possible to block function outputs,
timers or the function itself.

Analog channel configuration

DNSPDOC has three analog group inputs which must be properly configured.
Table 669: Analog inputs
Input
I3P
1)
IRES
U3P
1) Can be connected to GRPOFF if
IEC 61850 IEC 60617
identification identification
DNSPDOC I2> ->
Description
Three-phase currents
Residual current (measured or calculated)
Necessary when
or "Residual (calc)"
Three-phase voltages
Operating quantity is set to "Negative seq"
Section 4
Protection functions
ANSI/IEEE C37.2
device number
67Q
Operating quantity is "Residual"
741