BLOCK
BC
LLACC
STILL
TRLL
ANSI05000158-1-en.vsd
AND
OR
0
0-
tLoadOn
ANSI05000158 V1 EN
Figure 400:
Loss-of-load acceleration - simplified logic diagram
Breaker closing signals can if decided be connected to block the function during
normal closing.
13.4.3
Function block
IEC05000333-2-en.vsd
ZCLCPLAL
I3P*
BLOCK
ARREADY
NDST
EXACC
BC
LLACC
TRZE
TRLL
IEC05000333 V2 EN
Figure 401:
ZCLCPLAL function block
13.4.4
Input and output signals
Table 432:
ZCLCPLAL Input signals
Name
Type
Default
Description
I3P
GROUP
SIGNAL
-
Group signal for current input
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
EXACC
BOOLEAN
0
Connected to function used for tripping at zone
extension
BC
BOOLEAN
0
Breaker Close
LLACC
BOOLEAN
0
Connected to function used for tripping at loss of load
Section 13
1MRK505222-UUS C
Scheme communication
810
Technical reference manual
Summary of Contents for Relion 670 series
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