Protective Elements
SOTF - Switch Onto Fault
SOTF
In case a faulty line is energized (e.g.: when an earthing switch is in the ON-Position), an instantaneous trip is
required. The
SOTF
module is provided to generate a permissive signal for other protection functions such as
overcurrents to accelerate their trips (via adaptive parameters). The
SOTF
condition is recognized according to the
User’s operation mode that can be based on:
The breaker state (CB Pos);
No current flowing (I<);
Breaker state and no current flowing( CB Pos and I<);
Breaker switched on manually (CB manually On); and/or
An external trigger (Ex SOTF).
This protection module can initiate a high speed trip of the overcurrent protection modules.
This module issues a signal only (the module is not armed and does not
issue a trip command).
In order to influence the trip settings of the overcurrent protection in case
of switching onto a fault, the User has to assign the signal “SOTF.ENABLED“
onto an Adaptive Parameter Set. Please refer to Parameter / Adaptive
Parameter Sets sections. Within the Adaptive Parameter Set, the User has
to modify the trip characteristic of the overcurrent protection according to
the User's needs.
This Notice applies to protective devices that offer control functionality only!
This protective element requires, that a switchgear (circuit breaker is assigned
to it. It is allowed only to assign switchgears (circuit breaker) to this protective
element, whose measuring transformers provide measuring data to the
protective device.
863 MCDGV4 DOK-HB-MCDGV4-2E
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