ABB RED650 - Page 222

Table 107: Dependencies between parameters RetripMode and FunctionMode
RetripMode FunctionMode Description
Retrip Off N/A The re-trip function is not
activated.
CB Pos Check Current The re-trip will follow the
function mode.
Contact
Current/Contact
No CBPos Check Current The re-trip is done
unconditionally.
Contact
Current/Contact
The start signal can be an internal or external protection trip signal. This signal will
start the back-up trip timer. The function detects the successful breaker opening,
either by detection of low current through RMS evaluation and a special adapted
current algorithm or by open contact indication. The special algorithm enables a
very fast detection of successful breaker opening, that is, fast resetting of the
current measurement. If the current and/or contact detection has not detected
breaker opening before the back-up timer has run its time a back-up trip is initiated.
Further the following possibilities are available:
• The minimum length of the re-trip pulse, the back-up trip pulse and the back-
up trip pulse 2 are settable. The re-trip pulse, the back-up trip pulse and the
back-up trip pulse 2 will however sustain as long as there is an indication of
closed breaker.
• In the current detection it is possible to use three different options: 1 out of 3
where it is sufficient to detect failure to open (high current) in one pole, 1 out
of 4 where it is sufficient to detect failure to open (high current) in one pole or
high residual current and 2 out of 4 where at least two current (phase current
and/or residual current) shall be high for breaker failure detection.
• The current detection level for the residual current can be set different from the
setting of phase current detection.
• It is possible to have different back-up time delays for single-phase faults and
for multi-phase faults.
• The back-up trip can be made without current check. It is possible to have this
option activated for small load currents only.
• It is possible to have instantaneous back-up trip function if a signal is high if
the circuit breaker is incapable to clear faults, for example at low gas pressure.
Section 8 1MRK 505 394-UEN A
Current protection
216 Line differential protection RED650 2.2 IEC
Technical manual