ABB COM600 series User's & Technical Manual page 48

COM600 series 5.1 1MRS758734
Substation Analytics Technical Manual
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.
travel_time_calculation.png
Figure 5.4.2-2 Travel time calculation
There is a time difference t1 between the start of the main contact opening and the
opening of the POSCLOSE auxiliary contact. Similarly, there is a time gap t2 between
the time when the POSOPEN auxiliary contact opens and the main contact is completely
open. To incorporate the time t1 + t2, a correction factor needs to be added with topen
to get the actual opening time. This factor is added with the Opening time Cor (= t1 +
t2) setting. The closing time is calculated by adding the value set with the Closing time
Cor (t3 + t4) setting to the measured closing time.
The last measured opening travel time T_TRV_OP and the closing travel time T_TRV_CL
are available in the monitored data view on the LHMI or through tools via communica-
tions.
Alarm limit check
When the measured opening travel time is longer than the value set with the Open alarm
time setting, the TRV_OPEN_ALARM output is activated. Respectively, when the
measured closing travel time is longer than the value set with the Close alarm time setting,
the TRV_CLOSE_ALARM output is activated.
It is also possible to block the TRV_CLOSE_ALARM and TRV_OPEN_ALARM alarm
signals by activating the BLOCK input.
48