ABB RED650, Technical Manual

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6.1.6 Monitored data
PID-3701-MONITOREDDATA v3
Table 40: LT3CPDIF Monitored data
Name Type Values (Range) Unit Description
OPENCTIN INTEGER - - Open CT on Input : 1 for
input 1, 2 for input 2
OPENCTPH INTEGER - - Open CT in Phase : 1 for
L1, 2 for L2, 3 for L3
IDL1MAG REAL - A Magnitude of fund. freq.
differential current,
phase L1
IDL2MAG REAL - A Magnitude of fund. freq.
differential current,
phase L2
IDL3MAG REAL - A Magnitude of fund. freq.
differential current,
phase L3
IBIAS REAL - A Magnitude of the bias
current, common for L1,
L2, L3
IDNSMAG REAL - A Magnitude of the
negative sequence
differential current
NSANGLE REAL - deg Angle between local and
remote neg. seq.
currents
ICHARGE REAL - A Amount of compensated
charging current
6.1.7 Operation principle
6.1.7.1 Algorithm and logic
M13652-3 v7
The Line differential protection function evaluates measured current values from
local and remote line ends in order to distinguish between internal or external faults
or undisturbed conditions.
The local currents are fed to the IED via the analog input modules and then they
pass the analog-to-digital converter, as shown in Figure
33 .
1MRK 505 394-UEN A
Section 6
Differential protection
Line differential protection RED650 2.2 IEC 93
Technical manual