ABB RED650, Technical Manual

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Table 247: ECRWPSCH 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
13.5.6 Operation principle
13.5.6.1 Directional comparison logic function
M13929-4 v6
The directional comparison function contains logic for blocking overreaching and
permissive overreaching schemes.
The circuits for the permissive overreaching scheme contain logic for current
reversal and weak-end infeed functions. These functions are not required for the
blocking overreaching scheme.
Use the independent or inverse time functions in the directional earth fault
protection module to get backup tripping in case the communication equipment
malfunctions and prevents operation of the directional comparison logic.
Connect the necessary signal from the autorecloser for blocking of the directional
comparison scheme, during a single-phase autoreclosing cycle, to the BLOCK
input of the directional comparison module.
13.5.6.2 Fault current reversal logic
M13929-11 v8
The fault current reversal logic uses a reverse directed element, connected to the
input signal IRV, which recognizes that the fault is in reverse direction. When the
reverse direction element is activated the output signal IRVL is activated which is
shown in Figure
211 . The logic is now ready to handle a current reversal without
tripping. The output signal IRVL will be connected to the block input on the
permissive overreaching scheme.
When the fault current is reversed on the healthy line, IRV is deactivated and
IRVBLK is activated. The
tDelayRev timer delays the reset of the output signal.
The signal blocks operation of the overreach permissive scheme for residual
current and thus prevents unwanted operation caused by fault current reversal.
Section 13
1MRK 505 394-UEN A
Scheme communication
426 Line differential protection RED650 2.2 IEC
Technical manual