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3
3.1
3.2
3.3
74
Local acceleration logic (ZCLC)
Local acceleration logic (ZCLC)
Application
The main purpose of the ZCLC local acceleration logic is to achieve fast fault clearance for
faults anywhere on the whole line for those applications where no communication channel is
available.
Functionality
The ZCLC function is a complementary function to the distance protection function.
The local acceleration logic can be enabled for operation in two ways. The first way uses an 'au-
tomatic recloser ready' signal, either from the internal recloser, or an external recloser. The sec-
ond way uses loss of load detection. When enabled by either method, the local acceleration logic
will produce an immediate output on pickup of the function selected to the method of accelera-
tion enabled.
Function block
ZCLC-
ZCLC
BLOCK
TRIP
BC
LLACC
ARREADY
EXACC
NDST
xx00000373.vsd
Chapter 4
Line distance
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