Hitachi Relion 650 Series Technical Manual page 305

1MRK 511 557-UEN Rev. A
COPCMDLX
T
A
T
IEC19000920 V2 EN-US
Figure 139: Events during CB opening operation
The mechanical opening time, initial mechanical delay, and mechanical moving time are evaluated
based on the selected auxiliary feedback signal determined via AuxPosAvailable and enabled
MechMonitor.
The mechanical opening time is the time gap between the instant of received open command and
instant of primary contact separation as shown in
separation is not directly accessible, it is interpolated from the NO and NC changeover timestamps.
Subsequent to the interpolated primary contact separation instant, the mechanical opening time is
evaluated as given in
Technical Manual
INPNOLX
Primary
INPNCLX
Travel curve
= Initial mechanical delay
= Mechanical opening time
C
Table 275.
© 2021 Hitachi Energy. All rights reserved.
T T
A B
T
C
T =Mechanical moving time
B
Figure 139. As the instant of primary contact
Section 12
Monitoring
299