ABB Relion Technical Manual page 616

Section 14
Monitoring
610
Travelling time calculator
The breaker contact travel time is calculated from the time between auxiliary contacts'
state change. The open travel time is measured between the opening of the POSCLOSE
auxiliary contact and the closing of the POSOPEN auxiliary contact. Travel time is also
measured between the opening of the POSOPEN auxiliary contact and the closing of the
POSCLOSE auxiliary contact.
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There is a time difference t
of the POSCLOSE auxiliary contact. Similarly, there is a time gap t
when the POSOPEN auxiliary contact opens and the main contact is completely open.
Therefore, in order to incorporate the time t
t to get the actual opening time. This factor is added with the OpenTimeCorr (=t
Open
The closing time is calculated by adding the value set with the CloseTimeCorr (t
setting to the measured closing time.
The last measured opening travel time tTravelOpen and the closing travel time
tTravelClose are available through the Monitored data view on the LHMI or through
tools via communications.
Alarm limit check
When the measured open travel time is longer than the value set with the tOpenAlm
setting, the TRVTOAL output is activated. Respectively, when the measured close travel
time is longer than the value set with the tCloseAlm setting, the TRVTCAL output is
activated.
It is also possible to block the TRVTCAL and TRVTOAL alarm signals by activating the
BLOCK input.
between the start of the main contact opening and the opening
1
+t , a correction factor needs to be added with
1 2
1MRK 502 048-UUS A
between the time
2
+t ).
1 2
+t )
3 4
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