DPR-400 User Manual Rev_01 Firmware V-1.0
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This function operates on the negative components of the 3 phase voltage vectors has only one threshold
and uses the constant time trip characteristic curve.
If the breaker fails to open at the end of the configured timer when the open command was sent, this
means that the breaker has failed to perform its function, and is malfunctioning. In this situation, breaker
failure status occurs. A digital output may be configured as breaker failure output.
• Breaker Monitoring:
Digital inputs can be configured to read the open and closed contacts of the breaker. If breaker contact
information is assigned to digital inputs, abnormal situations will be displayed on the device’s protection
screen (MIMIC DIAGRAM) with the following symbols:
Breaker closed with correct closed input signal, but breaker open input signal also active.
Breaker open with correct open input signal, but breaker closed input signal also active.
Opposite breaker position and input position. Input reads closed while breaker is open, or
input reads open while the breaker is closed.
No symbol means breaker position and input values are correctly corresponding, or inputs
are not configured to read breaker position.
After a successful breaker trip, the system can be asked to try a reclosure if the fault cause is removed.
Up to 4 reclosure trials at different times can be done and the number of trials can be configured. In
addition, a no-fault timer after which the reclosure is counted as successful can be configured.
Automatic reclosure can be assigned to any output.
9.9. NEGATIVE SEQUENCE OVER VOLTAGE (ANSI 47)
9.10. BREAKER FAILURE (ANSI 50BF)
9.11. AUTOMATIC RECLOSURE (ANSI 79)
Breaker closed with correct
closed input signal, but breaker
open input signal also active.
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