ABB RED615 Technical Manual page 687

1YHT530004D05 D
615 series
Technical Manual
Live dead mode
Dead Bus, L Any
Dead L, Bus Any
One Live, Dead
Not Both Live
When the energizing direction corresponds to the settings, the situation has to be
constant for a time set with the Energizing time setting before the circuit breaker
closing is permitted. The purpose of this time delay is to ensure that the dead side
remains de-energized and also that the situation is not caused by a temporary
interference. If the conditions do not persist for a specified operation time, the
timer is reset and the procedure is restarted when the conditions allow. The circuit
breaker closing is not permitted if the measured voltage on the live side is greater
than the set value of Max energizing V.
The measured energized state is available as a monitored data value
ENERG_STATE and as four function outputs LLDB (live line / dead bus), LLLB
(live line / live bus), DLLB (dead line / live bus) and DLDB (dead line / dead bus),
of which only one can be active at a time. It is also possible that the measured
energized state indicates "Unknown" if at least one of the measured voltages is
between the limits set with the dead and live settings parameters.
Synchro check
The Synchro check function measures the difference between the line voltage and
bus voltage. The function permits the closing of the circuit breaker when the
following conditions are simultaneously fulfilled.
• The measured line and bus voltages are higher than the set values of Live bus
value and Live line value (ENERG_STATE equals to "Both Live").
• The measured bus and line frequency are both within the range of 95 to 105
percent of the value of f
• The measured voltages for the line and bus are less than the set value of Max
energizing V.
In case Syncro check mode is set to "Syncronous", the additional conditions must
be fulfilled.
• In the synchronous mode, the closing is attempted so that the phase difference
at closing is close to zero.
• The synchronous mode is only possible when the frequency slip is below 0.1
percent of the value of f
• The voltage difference must not exceed the 1 percent of the value of U
Description
Both line and bus de-energized or bus de-
energized and line energized
Both line and bus de-energized or line de-
energized and bus energized
Bus de-energized and line energized or line de-
energized and bus energized
Both line and bus de-energized or bus de-
energized and line energized or line de-
energized and bus energized
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Section 9
Control functions
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681