Section 7
1MAC050144-MB C
Control functions
518
615 series ANSI
Technical Manual
Table 429: Live dead mode of operation under which switching can be carried out
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 make sure 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 operate time, timer is reset and the procedure is
restarted when the conditions allow again. 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 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 synchrocheck function measures the difference between the line voltage and bus
voltage. The function trips and issues a closing command to the circuit breaker when the
calculated closing angle is equal to the measured phase angle and if the following
conditions are simultaneously fulfilled.
• The measured line and bus voltages are higher than 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 fn.
• The measured voltages for the line and bus are less than set value of Max energizing
V.
In case
Syncro check mode
is set to "Synchronous", 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 fn.
• The voltage difference must not exceed the 1 percent of the value of U
n
.
Live dead mode
Description
Both Dead
Both Line and Bus de-energized
Live L, Dead B
Bus de-energized and Line energized
Dead L, Live B
Line de-energized and Bus energized
Dead Bus, L Any
Both Line and Bus de-energized or Bus de-energized and Line energized
Dead L, Bus Any
Both Line and Bus de-energized or Line de-energized and bus energized
One Live, Dead
Bus de-energized and Line energized or Line de-energized and Bus energized
Not Both Live
Both Line and Bus de-energized or Bus de-energized and Line energized or Line
de-energized and Bus energized
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Страница 707: ...Section 15 1MAC050144 MB C Applicable standards and regulations 700 615 series ANSI Technical Manual ...
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