74
Local acceleration logic (ZCLC)
Chapter 4
Line distance
3
Local acceleration logic (ZCLC)
3.1
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.
3.2
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.
3.3
Function block
xx00000373.vsd
ZCLC-
ZCLC
BLOCK
BC
LLACC
ARREADY
EXACC
NDST
TRIP
Summary of Contents for REL 501-C1 2.5
Page 1: ...Technical reference manual Line distance protection terminal REL 501 C1 2 5 ...
Page 2: ......
Page 26: ...14 Introduction to the technical reference manual Chapter 1 Introduction ...
Page 42: ...30 Technical data Chapter 2 General ...
Page 66: ...54 Blocking of signals during test BST Chapter 3 Common functions ...
Page 142: ...130 Time delayed overvoltage protection TOV Chapter 6 Voltage ...
Page 162: ...150 Autorecloser AR Chapter 9 Control ...
Page 174: ...162 Event function EV Chapter 10 Logic ...
Page 210: ...198 Serial communication Chapter 12 Data communication ...
Page 226: ...214 Serial communication modules SCM Chapter 13 Hardware modules ...
Page 230: ...218 Terminal diagrams Chapter 14 Diagrams Figure 87 REL 501 C1 with DC switch ...
Page 234: ...222 Terminal diagrams Chapter 14 Diagrams ...
Page 237: ......