ABB RER620 Technical Manual page 368

Section 6
Condition monitoring functions
362
POSCLOSE_A
POSOPEN_A
POSCLOSE_B
POSOPEN_B
POSCLOSE _C
POSOPEN_C
RST_TRV_T
BLOCK
Figure 195: Functional module diagram for breaker contact travel time
Traveling time calculator
The contact travel time of the breaker is calculated from the time between auxiliary
contacts' state change. The open travel time is measured between the opening of the
POSCLOSE_A(_B,_C) auxiliary contact and the closing of the POSOPEN_A(_B,_C)
auxiliary contact. Travel time is also measured between the opening of the POSOPEN
auxiliary contact and the closing of the POSCLOSE_A(_B,_C) auxiliary contact.
Main Contact (A)
close
POSCLOSE_A
1
0
POSOPEN_A
t
1
T_TRV_OP_A= t
Figure 196: Travel time calculation
There is a time difference t
of the POSCLOSE_A(_B,_C) auxiliary contact. Similarly, there is a time gap t
the time when the POSOPEN_A(_B,_C) auxiliary contact opens and the main contact is
completely open. Therefore, in order to incorporate the time t
needs to be added with t
open
Traveling
time (A)
calculator
Traveling
Alarm limit
time (B)
check
calculator
Traveling
time (C)
calculator
open
1
0
t
2
t
open
+t +t
open 1 2
between the start of the main contact opening and the opening
1
to get the actual opening time. This factor is added with the
1MAC309294-MB F
TRV_T_CL_ALM
TRV_T_OP_ALM
close
t
t
3
4
t
close
T_TRV_CL_A= t +t +t
close 3 4
between
2
+t , a correction factor
1 2
Technical Manual
RER620