ABB RELION REX640 Technical Manual page 1264

Section 7
Condition monitoring functions
1258
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.
GUID-672A7BD0-D77B-40E7-9798-8B7736D5052A V1 EN
Figure 686: Travel time calculation when Travel time Clc mode is "From Pos to
Pos"
There is a time difference t
opening of the POSCLOSE auxiliary contact. Similarly, there is a time gap t
the time when the POSOPEN auxiliary contact opens and the main contact is
completely open. To incorporate the time t
with t to get the actual opening time. This factor is added with the Opening time
open
Cor (= t + t ) setting. The closing time is calculated by adding the value set with the
1 2
Closing time Cor (t + t
3
When the setting Travel time Clc mode is "From Cmd to Pos", the contact travel time
of the breaker is calculated from the time between the circuit breaker opening or
closing command and the auxiliary contacts' state change. The opening travel time is
measured between the rising edge of the OPEN_CB_EXE command and the
POSOPEN auxiliary contact. The closing travel time is measured between the rising
edge of the CLOSE_CB_EXEC command and the POSCLOSE auxiliary contact.
between the start of the main contact opening and the
1
+ t , a correction factor needs to be added
1 2
) setting to the measured closing time.
4
1MRS759142 C
between
2
REX640
Technical Manual