Hitachi Relion 650 Series Technical Manual page 303

1MRK 511 557-UEN Rev. A
Table 272: Derivation of the mechanical closing time from NO and NC changeover timestamps
auxPosAvailable
None
NO only
NC only
NO and NC
where,
T = Estimated mechanical operating time
main
T = Actual time gap between NO changeover time and CCLCMDLX activation
NO
T = Actual time gap between NC changeover time and CCLCMDLX activation
NC
T = nominal mechanical closing time, as received on the INPRICLLX input
main0
T = nominal changeover time of NO auxiliary contact, as received on the INNOCLLX input
NO0
T = nominal changeover time of NC auxiliary contact, as received on the INNCCLLX input
NC0
In addition to the actual (estimated) value, ACBMSCBR also provides the predicted mechanical CB
closing time for the operation. The predicted value is given on receiving the close command
(CLCMDINP), and the actual value is given 300 ms after receiving the CCLCMDLX command.
Based on the changeover of NC contact, the initial mechanical delay is evaluated as the time gap
between the instant of received close command and instant of NC changeover as shown in
273.
Table 273: Derivation of the initial mechanical closing delay from NO and NC changeover timestamps
auxPosAvailable
None
NO only
NC only
NO and NC
where,
t = Measured initial mechanical delay
imd
t = Actual NC changeover time
NC
Technical Manual
Estimated mechanical closing time
0.0
 
T T ( T
main main 0 NO
IECEQUATION19315 V2 EN-US

 
T T
main main 0
IECEQUATION19316 V2 EN-US


  
T T  T T
main NC main 0

IECEQUATION19317 V1 EN-US
Initial mechanical delay
0.0
0.0
t = t – CCLCMDLX (timestamp)
imd NC
t = t – CCLCMDLX (timestamp)
imd NC
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
T )
NO 0


T T
NC NC 0


T T

 NO NC

NC 0


T T
NO 0 NC 0
Section 12
Monitoring
Table
297