Section 6
1MAC050144-MB C
Supervision functions
420
615 series ANSI
Technical Manual
Figure 215:
Travel time calculation
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.
Therefore, in order 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
). 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.
The last measured opening travel time
T_TRV_OP
and the closing travel time
T_TRV_CL
are available through the Monitored data view on the LHMI or through tools via
communications.
Alarm limit check
When the measured open 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 close
travel time is longer than the value set with the
Close alarm time
setting, the , 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.
6.1.4.4
Operation counter
The operation counter subfunction calculates the number of breaker operation cycles. Both
open and close operations are included in one operation cycle. The operation counter value
is updated after each open operation.
The operation of the subfunction can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
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