ABB RELION 620 Series Technical Manual page 571

1MAC504801-IB E
6.1.4.3
620 series ANSI
Technical Manual
A071105 V2 EN
Figure 279: Functional module diagram for calculating inactive days and alarm for
circuit breaker operation monitoring
Inactivity timer
The module calculates the number of days the circuit breaker has remained inactive, that
is, has stayed in the same open or closed state. The calculation is done by monitoring the
states of the POSOPEN and POSCLOSE auxiliary contacts.
The inactive days INA_DAYS is available in the monitored data view. It is also possible
to set the initial inactive days with the Ini inactive days parameter.
Alarm limit check
When the inactive days exceed the limit value defined with the Inactive Alm days setting,
the MON_ALM alarm is initiated. The time in hours at which this alarm is activated can be
set with the Inactive Alm hours parameter as coordinates of UTC. The alarm signal
MON_ALM can be blocked by activating the binary input BLOCK.
Breaker contact travel time
The Breaker contact travel time module calculates the breaker contact travel time for the
closing and opening operation. The operation of the breaker contact travel time
measurement can be described with a module diagram. All the modules in the diagram are
explained in the next sections.
A071106 V3 EN
Figure 280: Functional module diagram for breaker contact travel time
Traveling time calculator
The opening travel time is measured between the opening of the POSCLOSE auxiliary
contact and the closing of the POSOPEN auxiliary contact. The travel time is also
Section 6
Supervision functions
565