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2.4
2.5
2.6
72
Automatic switch onto fault logic (SOTF)
Logic diagram
S O T F -B C
S O T F -D L C N D
&
S O T F -N D A C C
S O T F -B L O C K
Figure 29:
SOTF function - simplified logic diagram
Input and output signals
Table 86:
Input signals for the SOTF (SOTF-) function block
Signal
BLOCK
NDACC
DLCND
BC
Path in local HMI: ServiceReport/Functions/Impedance/ SwitchOntoFlt/FuncOutputs
Table 87:
Output signals for the SOTF (SOTF-) function block
Signal
TRIP
Setting parameters
Path in local HMI: Settings/Functions/Groupn/Impedance/SwitchOntoFlt
Table 88:
Setting parameters for the automatic switch onto fault logic SOTF (SOTF-)
function
Parameter
Range
Operation
Off / On
1 0 0 0 m s
> 1
t
2 0 0 m s
t
&
Description
Blocks function
Connected to function(s) to be released for immediate tripping when
SOTF function is enabled
Connected to dead line detection function to provide automatic
enabling of SOTF function
Enabling of SOTF function by circuit breaker close command or nor-
mally closed auxiliary contact of the circuit breaker
Description
Trip output
Default
Unit
Off
-
Line distance
1 5 m s
S O T F -T R IP
&
t
e n 0 0 0 0 0 4 9 2 .vs d
Description
Operating mode for SOTF function
Chapter 4
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