Time
The fault
occurs
Protection
operate time
Trip and Start
BFP
Normal t
cbopen
Margin
Retrip delay t1
t
cbopen
after re-trip
t
BFPreset
Minimum back-up trip delay t2
Critical fault clearance time for stability
en05000479.vsd
EN05000479 V1 EN
Figure 13:
Overexcitation protection characteristics
3.1.9
Calculating settings for LV-side breaker failure protection,
CCRBRF (50BF)
The breaker failure protection can use either the position indication of the circuit breaker
or measure the current going through the CT in order to detect correct breaker functioning.
For transformer protections it is most suitable to use current measurement as a circuit
breaker failure check.
1.
Set
GlobalBaseSel
to
2
The (LV) winding data should be related to Global base 2.
2.
Set
FunctionMode
to
Current
3.
Set
BuTripMode
to
1 out of 3
The current measurement function uses the three-phase currents from the line CT
and either, a measured residual current or a calculated 3I0. Based on this analogue
data one of the following rules can be chosen in order to determine a breaker failure:
Section 3
1MRK 511 286-UUS A
REC650 setting examples
58
Application manual
Содержание REC650 ANSI
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