16.4.7.8
Circuit breaker gas pressure indication
The circuit breaker gas pressure indication subfunction monitors the gas pressure
inside the arc chamber. The operation is described in
.
PRESLO
BLOCK
BLKALM
PRESALM
GPRESALM
GPRESLO
t
tDGasPresAlm
t
tDGasPresLO
AND
AND
IEC12000622 V3 EN
Figure 436:
Functional module diagram for circuit breaker gas pressure
indication
When the
PRESALM
binary input is activated, the
GPRESALM
output is activated after
a time delay set with the
tDGasPresAlm
setting. The
GPRESALM
alarm can be
blocked by activating the BLKALM input.
If the pressure drops further to a very low level, the
PRESLO
binary input goes high,
activating the lockout alarm
GPRESLO
after a time delay set with the
tDGasPresLO
setting. The
GPRESLO
alarm can be blocked by activating the
BLKALM
input.
The binary input
BLOCK
can be used to block the function. The activation of the
BLOCK
input deactivates all outputs and resets internal timers. The alarm signals from
the function can be blocked by activating the binary input
BLKALM
.
16.4.8
Technical data
Table 662:
SSCBR Technical data
Function
Range or value
Accuracy
Alarm level for open and close
travel time
(0 – 200) ms
±3 ms
Alarm level for number of
operations
(0 – 9999)
-
Independent time delay for
spring charging time alarm
(0.00 – 60.00) s
±0.2% or ±30 ms whichever is
greater
Independent time delay for gas
pressure alarm
(0.00 – 60.00) s
±0.2% or ±30 ms whichever is
greater
Independent time delay for gas
pressure lockout
(0.00 – 60.00) s
±0.2% or ±30 ms whichever is
greater
CB Contact Travel Time,
opening and closing
±3 ms
Remaining Life of CB
±2 operations
Accumulated Energy
±1.0% or ±0.5 whichever is
greater
1MRK502052-UEN B
Section 16
Monitoring
909
Technical manual
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