ABB Relion 670 series, Technical Manual

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Table 175: LEXPDIS (40) Non group settings (basic)
Name Values (Range) Unit Step Default Description
GlobalBaseSel 1 - 12 - 1 1 Selection of one of the Global Base Value
groups
MeasureMode PosSeq
AB
BC
CA
- - PosSeq Measuring mode (PosSeq, AB, BC, CA)
Table 176: LEXPDIS (40) Non group settings (advanced)
Name Values (Range) Unit Step Default Description
InvertCTcurr No
Yes
- - No Invert CT current
7.12.6 Monitored data
PID-3665-MONITOREDDATA v4
Table 177: LEXPDIS (40) Monitored data
Name Type Values (Range) Unit Description
XOHM REAL - Ohm Reactance in Primary Ohms
XPERCENT REAL - % Reactance in percent of Zbase
ROHM REAL - Ohm Resistance in Primary Ohms
RPERCENT REAL - % Resistance in percent of Zbase
7.12.7 Operation principle
SEMOD156166-4 v6
The Loss of excitation (LEXPDIS ,40) protection in the IED measures the apparent impedance seen
out from the generator.The measurement loop of apparent impedance can be chosen as the
positive sequence loop or any one of the three phase-to-phase loops depending on the available
current and voltage signals. It is recommended to use positive sequence quantities for function
operation.
Section 7 1MRK 502 066-UUS B
Impedance protection
390
Technical manual