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
.
7.1.4.3
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.
Figure 488: 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 contact and the closing of the
POSOPEN
auxiliary contact. The travel time
is also measured between the opening of the
POSOPEN
auxiliary contact and the
closing of the
POSCLOSE
auxiliary contact.
Figure 489: Travel time calculation when Travel time Clc mode is “From Pos to Pos”
There is a time difference t
1
between the start of the main contact opening and
the opening of the
POSCLOSE
auxiliary contact. Similarly, there is a time gap t
2
Condition monitoring functions
1MRS757644 H
912
620 series
Technical Manual
