ABB Relion 620 Series - Page 913

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.
Figure 490: Travel time calculation when Travel time Clc mode is “From Cmd to Pos”
There is a time difference t
1
between the start of the main contact opening and
the OPEN_CB_EXE command. Similarly, there is a time gap t
2
between the time
when the POSOPEN auxiliary contact opens and the main contact is completely open.
Therefore, to incorporate the times t
1
and 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
2
- t
1
) setting. The closing time is calculated by adding the value set
with the Closing time Cor (t
4
- t
3
) setting to the measured closing time.
The last measured opening travel time T_TRV_OP and the closing travel time
T_TRV_CL are available in the monitored data view on the LHMI or through tools
via communications.
Alarm limit check
When the measured opening travel time is longer than the value set with the Open
alarm time setting, the TRV_T_OP_ALM output is activated. Respectively, when the
measured closing travel time is longer than the value set with the
Close alarm time
setting, the TRV_T_CL_ALM output is activated.
It is also possible to block the TRV_T_CL_ALM and TRV_T_OP_ALM alarm signals by
activating the BLOCK input.
1MRS757644 H
Condition monitoring functions
620 series
Technical Manual
913