Basler BE1-CDS220, Instruction Manual

Page: 140 / 476

6-22 Reporting and Alarm Functions BE1-CDS220
Again, the setting is in terms of primary amps. The 0.5 power (i.e., square root factor) shown above for
the D
MAX
setting is to compensate for the fact that the relay internally squares the D
MAX
that is entered.
When testing the relay by injecting currents into the relay, the values in the duty registers should be read
and recorded prior to the start of testing. Once testing is complete and the relay is returned to service, the
registers should be reset to the original pre-test values. A block accumulation logic input may be used
when testing so that simulated breaker duty is not added to the duty registers. The BLKBKR logic function
is an OR logic term (e.g., IN1 or VO7) which blocks the breaker monitoring logic when TRUE (1).
BLKBKR is set to zero to disable blocking. When breaker monitoring is blocked (logic expression equals
1), breaker duty is not accumulated.
Protective
element
picks up
Protective
element
trips
Breaker auxiliary
contact changes
state Protective
element
drops out
Fast
dropout
current
detector
drops out
SG-TRIGGER
-Pickup
-Logic
PU + logic
Fast dropout
current
detector
Breaker
status
Fault summary
report triggered
(When SG-TRIGGER (PU or Logic) is TRUE)
A
B
Targets logged
C Fault clearing
time calculated
D
Breaker
operate time
Oscillographic
Record
pre-trigger
Post-trigger recording
Post-trigger
1/4 to 5 cycles
of pre-trigger
E
F
Fault currents
recorded
G Red TRIP LED
flashing
(When SG-TRIGGER (PU) is TRUE)
H Red TRIP LED
solid
Breaker interruption
duty
Transformer
fault duty
Setting group
change blocked
I
J
K
D2843-42
09-29-03
(SB-LOGIC setting)
-Trip
When
SG-TRIGGER
(PU or Logic)
goes FALSE
(When SG-TRIGGER (PU or Logic) is TRUE)
(When SG-TRIGGER (PU or Logic) is TRUE)
(When SG-TRIGGER (PU) is TRUE)
(When SG-TRIGGER (PU) is TRUE)
(When SG-TRIGGER (Trip) is TRUE)
Figure 6-9. Protective Fault Analysis