Hitachi Relion 650 Series Technical Manual page 306

Section 12
Monitoring
Table 275: Derivation of mechanical opening 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 COPCMDLX activation
NO
T = Actual time gap between NC changeover time and COPCMDLX activation
NC
T = nominal mechanical opening time, as received on the INPRIOPLX input
main0
T = nominal changeover time of NO auxiliary contact, as received on the INNOOPLX input
NO0
T = nominal changeover time of NC auxiliary contact, as received on the INNCOPLX input
NC0
In addition to the actual (estimated) value, ACBMSCBR also provides the predicted mechanical CB
opening time for the operation. The predicted value is given on receiving the trip command
(OPCMDINP), and the actual value is given 300 ms after receiving the COPCMDLX command.
Based on the changeover of NO contact, the initial mechanical delay is evaluated as the time gap
between the instant of received close command and instant of NO changeover as shown in
276.
Table 276: Derivation of the initial mechanical opening 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 NO changeover time
NO
300
Estimated mechanical opening time
0.0
 
T T
main main 0
IECEQUATION19315 V2 EN-US

T T
main main
IECEQUATION19316 V2 EN-US


 

T T T
main NO

IECEQUATION19398 V1 EN-US
Initial mechanical delay
0.0
t = t – COPCMDLX (timestamp)
imd NO
0.0
t = t – COPCMDLX (timestamp)
imd NO
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
( T T )
NO NO 0
 
 
T T
0 NC NC 0


T T

 
NC NO 
T

main 0 NO 0

T T
NC 0 NO 0
1MRK 511 557-UEN Rev. A
Table
Technical Manual