Breaker Contact Travel Time - ABB Relion SMU615 Technical Manual

Section 6
Condition monitoring functions
6.1.4.3
156
A071105 V2 EN
Figure 107: 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 V4 EN
Figure 108: Functional module diagram for breaker contact travel time
Traveling time calculator
The travel time can be calculated using two different methods based on the setting
Travel time Clc mode.
When the setting Travel time Clc mode is "From Pos to Pos", the contact travel time
of the breaker is calculated from the time between auxiliary contacts' state change. The
opening travel time is measured between the opening of the POSCLOSE auxiliary
1MRS758407 B
SMU615
Technical Manual