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5.8.3
Functionality
The switch onto fault function SOTF provides an instantaneous trip or a time delayed trip
when closing the breaker while a fault exists.
SOTF is activated when the
CB_CL_CMD
circuit breaker closing command is set high.
The function has
PICKUP
and
PICKUP_DLYD
inputs for immediate or delayed pickup
operation respectively.
The function contains a blocking functionality. It is possible to block function outputs and
the reset timers, if desired.
5.8.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The corresponding
parameter values are "Enable" and "Disable".
The operation of SOTF can be described by using a module diagram. All the modules in
the diagram are explained in the next sections.
PICKUP
PICKUP_DLYD
TRIP
CB_CL_CMD
BLOCK
SOTF
control
Trigger
GUID-E9DDE27C-C5BA-46BA-B508-A4147781CC75 V1 EN
Figure 424:
Functional module diagram
Trigger
This module is used for detecting possible fault immediately after closing the circuit
breaker. An external protection function for example, 51P, 50P, 50P-3 or 51N, 51G, 50N,
50G, 50N-3, 50G-3 is used for fault indication. The
PICKUP
and
PICKUP_DLYD
inputs
are available for feeding the detected fault.
•
PICKUP
input is used when it is required to enable SOTF control immediately after
protection function indicates a fault.
•
PICKUP_DLYD
input is used when time delayed SOTF control enabling is needed.
In this case, the delay can be set with a
Trip delay time
setting.
Section 5
1MAC059074-MB A
Protection related functions
832
615 series ANSI
Technical Manual
Содержание Relion 615 series
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