ABB RELION Series, Technical Manual

Page: 545 / 804

A071107 V1 EN
Figure 283: 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.
1MRS758755 A
Section 7
Condition monitoring functions
REC615 and RER615 539
Technical Manual