ABB Relion 670 Series Technical Reference Manual page 814

Section 13
Scheme communication
13.3.6
13.4
13.4.1
13.4.2
13.4.2.1
808
Technical data
Table 431: ZCRWPSCH (85) technical data
Function
Detection pickupphase-to-
neutral voltage
Detection pickup phase-to-
phase voltage
Reset ratio
Operate time for current reversal
logic
Delay time for current reversal
Coordination time for weak-end
infeed logic
Local acceleration logic ZCLCPLAL
Function description
Local acceleration logic
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).
Principle of operation
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.
Range or value
(10-90)% of VBase
(10-90)% of VBase
<105%
(0.000-60.000) s
(0.000-60.000) s
(0.000-60.000) s
IEC 61850 IEC 60617
identification identification
ZCLCPLAL
1MRK505222-UUS C
Accuracy
± 0.5% of Vn
± 0.5% of Vn
-
± 0.5% ± 10 ms
± 0.5% ± 10 ms
± 0.5% ± 10 ms
ANSI/IEEE C37.2
device number
- -
Technical reference manual