6.3.2 Functionality
SEMOD153644-5 v9
Automatic switch onto fault logic ZCVPSOF is a function that gives an
instantaneous trip when closing the breaker onto a fault. A dead-line detection
check is provided to activate ZCVPSOF when the line is de-energized.
Mho distance protections cannot operate for switch onto fault conditions when the
phase voltages are close to zero. An additional logic based on UI Level is used for
this purpose.
ZCVPSOF is a complementary function to the distance protection function. It is
enabled for operation either by the closing command to the circuit breaker
(normally closed auxiliary contact of the circuit breaker) to the BC input or
automatically by the dead-line detection. Once enabled, it remains active for tSOTF
duration after the enabling signal is reset. The protection function can be enabled
for tripping during the activated time by connecting the functions included in the
terminal to the ZACC input. Therefore, the start of the selected protection functions
connected to ZACC during the enabled condition results in an immediate TRIP
output from the function.
6.3.3 Function block
SEMOD156265-4 v6
IEC06000459 V3 EN-US
Figure 58: ZCVPSOF function block
6.3.4 Signals
SEMOD156281-1 v2
PID-3875-INPUTSIGNALS v10
Table 44: ZCVPSOF Input signals
Name
Type Default Description
I3P GROUP
SIGNAL
- Current DFT
U3P GROUP
SIGNAL
- Voltage DFT
BLOCK BOOLEAN 0 Block of function
START_DLYD BOOLEAN 0 Start from function to be accelerated with delay
by SOTF
BC BOOLEAN 0 External enabling of SOTF
ZACC BOOLEAN 0 Distance zone to be accelerated by SOTF
1MRK 506 382-UEN A Section 6
Impedance protection
Line distance protection REL650 2.2 IEC 131
Technical manual
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