12.4
Local acceleration logic ZCLCPLAL
12.4.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Local acceleration logic
ZCLCPLAL
-
-
12.4.2
Functionality
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 and re-closing 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).
12.4.3
Function block
ZCLCPLAL
I3P*
BLOCK
ARREADY
NDST
EXACC
BC
LLACC
TRZE
TRLL
IEC09000005-1-en.vsd
IEC09000005 V1 EN
Figure 242:
ZCLCPLAL function block
12.4.4
Signals
Table 347:
ZCLCPLAL Input signals
Name
Type
Default
Description
I3P
GROUP
SIGNAL
-
Three phase group signal for current inputs
BLOCK
BOOLEAN
0
Block of function
ARREADY
BOOLEAN
0
Autoreclosure ready, releases function used for fast trip
NDST
BOOLEAN
0
Non directional criteria used to prevent instantaneous
trip
Table continues on next page
1MRK 506 335-UUS A
Section 12
Scheme communication
513
Technical manual
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