5.6.2 Function block
GUID-766B0C1E-86C1-4C7F-8C71-56A0EF89E74A V2 EN
Figure 299: Function block
5.6.3 Functionality
The automatic switch on to fault function CBRSOF provides an instantaneous trip
or a time delayed trip when closing the breaker while a fault exists.
CBRSOF is activated when the CB_CL_CMD circuit breaker closing command is
set high. CBRSOF has START and START_DLYD inputs for immediate or delayed
start operation respectively.
The function contains a blocking functionality. It is possible to block function
outputs and the reset timers, if desired.
5.6.4 Principle of operation
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of automatic switch onto fault function can be described by using a
module diagram. All the modules in the diagram are explained in the next sections.
GUID-A786834F-1BA2-4DD6-8457-D38BCBC4ABF8 V2 EN
Figure 300: Functional module diagram
Trigger
This module is used for detecting possible fault immediately after closing the
circuit breaker. An external protection function like PHxPTOC or EFxPTOC is
used for fault indication. The START and START_DLYD inputs are available for
feeding the detected fault.
Section 5 1YHT530004D05 D
Protection related functions
564 615 series
Technical Manual
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