ABB Relion 670 series - Technical data; Local acceleration logic ZCLCPLAL; Introduction; Principle of operation

13.3.6 Technical data
Table 431: ZCRWPSCH (85) technical data
Function Range or value Accuracy
Detection pickupphase-to-
neutral voltage
(10-90)% of VBase ± 0.5% of Vn
Detection pickup phase-to-
phase voltage
(10-90)% of VBase ± 0.5% of Vn
Reset ratio <105% -
Operate time for current reversal
logic
(0.000-60.000) s ± 0.5% ± 10 ms
Delay time for current reversal (0.000-60.000) s ± 0.5% ± 10 ms
Coordination time for weak-end
infeed logic
(0.000-60.000) s ± 0.5% ± 10 ms
13.4 Local acceleration logic ZCLCPLAL
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Local acceleration logic ZCLCPLAL - -
13.4.1 Introduction
To achieve fast clearing of faults on the whole line, when no communication channel is
available, local acceleration logic (ZCLCPLAL) can be used. This logic enables fast
fault clearing during certain conditions, but naturally, it can not fully replace a
communication channel.
The logic can be controlled either by the autorecloser (zone extension) or by the loss-of-
load current (loss-of-load acceleration).
13.4.2 Principle of operation
13.4.2.1 Zone extension
The overreaching zone is connected to the input EXACC. For this reason, configure
the ARREADY functional input to a READY functional output of a used autoreclosing
function or via the selected binary input to an external autoreclosing device, see
figure 399.
This will allow the overreaching zone to trip instantaneously.
Section 13 1MRK505222-UUS C
Scheme communication
808
Technical reference manual