1MDU07212-YN Rev. D Section 4
Protection and Control Function
REF601 / REJ601 / REM601 23
Application Manual
4.7.2 Principle of operation
Initialization logic
There are two methods by which function can be initialized. The method to be used
depends on O→I start mode setting. Possible options for this settings are
Mode 1 = Trip
Mode 2 = Gen Start & Trip
Figure 4: Initiation logic
Mode 1 operation:
The function is initialized on the rising edge of the external trip signal (received via
binary input and Modbus, provided they are not blocked).
Remark: However in addition it is required that circuit breaker is in closed position
AND auto reclosure is not blocked AND circuit breaker is in ready condition (if
CB ready setting is selected as O-C-O).
Mode 2 operation:
The function is initialized on rising signal of the general trip signal (which will be
an OR of trip of I>, I>>, I>>>, Io>, Io>>, I2>, I2/I1>) if it is received within time
set via Activate t of receipt of general start signal (which will be an OR of start of
I>, I>>, I>>>, Io>, Io>>, I2>, I2/I1>).
However in addition it is required that circuit breaker is in closed position AND
auto reclosure is not blocked AND circuit breaker is in ready condition (if CB
ready setting is selected as O-C-O).
The initialization of the auto reclosures function will be registered as an event
“O→I Started”.
The auto-reclose function can be set off by setting O→I cycle to “0”.
In case if no binary inputs are configured for indicating circuit
breaker position, the setting O→I cycle will automatically sets to
“0” (Auto Reclose not in use) to avoid any mal-operation.
Auto reclose control
The auto reclose control initiated by above described initiation logic follows
following schematic:
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