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2.8 BREAKER FAILURE TO OPEN (AVAILABLE ONLY IN OPTION 2 MODELS)
2.8BREAKER FAILURE TO OPEN (AVAILABLE ONLY IN OPTION 2 MODELS)
This element produces an alarm if the breaker does not open after a tripping command.
This element can be enabled independently from having an input that indicates the breaker status:
If a breaker status input is enabled:
After a trip, the following conditions are checked:
2
1.
If the breaker is closed, the BREAKER FAILURE function is started.
2.
If the breaker is open, the unit checks the current. If the highest current is over 8% of the rated current, the BREAKER
FAILURE function is started.
After the BREAKER FAILURE pickup, a timer is started. When the timer countdown finishes, if the function is not disabled,
the FAILURE TO OPEN status signal is activated, and the corresponding event is generated.
The Breaker Failure to Open signal is reset when the breaker is open and there is no current. once the breaker has been
opened, it gets closed again.
If a breaker status input is not enabled:
After a trip, the unit checks whether the highest current value is over 8% of the rated current. In this case, a timer is started.
When the timer countdown finishes, if the current value has not fallen below 4% of the rated current, the FAILURE TO
OPEN status signal is activated, and the corresponding event is generated.
The Breaker Failure to Open signal is reset when the current value, of at least one phase, rises above 8% of the rated
current after all of the phase currents have fallen below 4% of it.
The settings associated to BREAKER FAILURE TO OPEN are the function permission and the timer value. They are
included in the ADVANCED SETTINGS group. They will be described in the SETTINGS section.
2-14
MIFII Digital Feeder Relay
2 PRODUCT DESCRIPTION
GEK-106237P
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