ABB 615 Series - Page 889

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.
A071107 V1 EN
Figure 457: 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
between the time
when the POSOPEN auxiliary contact opens and the main contact is completely open. To
incorporate the time t
1
+ t
2
, a correction factor needs to be added with t
open
to get the actual
opening time. This factor is added with the Opening time Cor (= t
1
+ t
2
) setting. The
closing time is calculated by adding the value set with the Closing time Cor (t
3
+ t
4
) setting
to the measured closing time.
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.
1MAC059074-MB A Section 7
Condition monitoring functions
615 series ANSI 883
Technical Manual