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3.4
ZCLC-BLOCK
ZCLC-
ARREADY
ZCLC-NDST
ZCLC-EXACC
ZCLC-BC
STILL
ZCLC-LLACC
3.5
Local acceleration logic (ZCLC)
Logic diagram
>1
1
>1
15 ms
t
Figure 30:
Simplified logic diagram for the local acceleration logic
Input and output signals
Table 90:
Input signals for the ZCLC (ZCLC-) function block
Signal
BLOCK
BC
LLACC
ARREADY
EXACC
NDST
Path in local HMI: ServiceReport/Functions/Impedance/ComLocal/FuncOutputs
Table 91:
Output signals for the ZCLC (ZCLC-) function block
Signal
TRIP
&
&
ZoneExtension = On
LossOfLoad = On
&
Description
Blocks function
Circuit breaker closed
Connected to function to be used for tripping at loss of load accelera-
tion
Releases function used for zone extension for immediate tripping
Connected to function to be used for tripping at zone extension
Connected to function to be used to prevent zone extension for its
picked-up duration if the release for zone extension is not present
when it picks-up
Description
Trip output
Chapter 4
Line distance
&
ZCLC-TRIP
>1
&
99000455.vsd
75
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