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14.16.7
Technical data
Table 427:
SSIML(71) Technical data
Function
Range or value
Accuracy
Timers
(0.000-60.000) s
± 0.5% ± 110 ms
14.17
Circuit breaker condition monitoring SSCBR
14.17.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Circuit breaker condition monitoring
SSCBR
-
-
14.17.2
Functionality
The circuit breaker condition monitoring function SSCBR is used to monitor different
parameters of the circuit breaker. The breaker requires maintenance when the number of
operations has reached a predefined value. For proper functioning of the circuit breaker,
it is essential to monitor the circuit breaker operation, spring charge indication, breaker
wear, travel time, number of operation cycles and accumulated energy. The energy is
calculated from the measured input currents as a sum of I
^
2 t values. Alarms are generated
when the calculated values exceed the threshold settings.
The function contains a block alarm functionality.
The supervised and presented breaker functions include
•
breaker open and close travel time
•
spring charging time
•
number of breaker operations
•
accumulated I
Y
t per phase with alarm and lockout
•
remaining breaker life per phase
•
breaker inactivity
Section 14
1MRK 502 048-UUS A
Monitoring
602
Technical manual
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