tResetLevelAlm: This is used for the level alarm indication to reset after a set time delay
in s.
tResetLevelLO: This is used for the level lockout indication to reset after a set time delay
in s.
tResetTempLO: This is used for the temperature lockout indication to reset after a set time
delay in s.
tResetTempAlm: This is used for the temperature alarm indication to reset after a set time
delay in s.
18.4 Breaker monitoring SSCBR
18.4.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Breaker monitoring SSCBR - -
18.4.2 Application
The circuit breaker maintenance is usually based on regular time intervals or the number
of operations performed. This has some disadvantages because there could be a number
of abnormal operations or few operations with high-level currents within the
predetermined maintenance interval. Hence, condition-based maintenance scheduling is
an optimum solution in assessing the condition of circuit breakers.
Circuit breaker contact travel time
Auxiliary contacts provide information about the mechanical operation, opening time and
closing time of a breaker. Detecting an excessive traveling time is essential to indicate the
need for maintenance of the circuit breaker mechanism. The excessive travel time can be
due to problems in the driving mechanism or failures of the contacts.
Circuit breaker status
Monitoring the breaker status ensures proper functioning of the features within the
protection relay such as breaker control, breaker failure and autoreclosing. The breaker
status is monitored using breaker auxiliary contacts. The breaker status is indicated by the
binary outputs. These signals indicate whether the circuit breaker is in an open, closed or
error state.
1MRK 506 369-UUS - Section 18
Monitoring
Line distance protection REL670 2.2 ANSI 831
Application manual
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