Hitachi Relion 650 Series Technical Manual page 308

Section 12
Monitoring
The same value is also given at the output AELORTMLX for closing operations.
The actual pre-strike angle APRESTRAX (in degrees) is defined as:
APRESTRAX = PPRESTRAX + AELORTCLX – PELORTCLX
Refer to
ACBMSCBR also evaluates error target value ERELOTCLX (in milliseconds) for close operations as
difference between AELORTCLX and PELORTCLX,
ERELOTCLX = AELORTCLX – PELORTCLX
The same value is also given at the output ERELORTLX for closing operations.
Arcing time and electrical interruption time (CB opening)
ACBMSCBR provides two sets of values each for arcing time and electrical interruption time during
any trip operation, namely the predicted and actual values of the operation. The predicted values are
published as soon as the trip command is received on the OPCMDINP input, and the actual values
are published as soon as the interruption instant is detected. The predicted values are given at the
outputs PARCTMLX, PELORTLX and PELORTOLX. The actual values are given at the outputs
AARCTMLX, AELORTMLX and AELORTOLX.
Knowledge of the following design characteristics of the circuit breaker is essential for monitoring.
These characteristics are provided to the function through the following settings.
Table 278: Breaker specific settings for open operations
Setting
InitArcTime
MaxArcTime
ArcTimeTrafoLX
The predicted arcing time PARCTMLX (in milliseconds) is defined as:
PARCTMLX = InitArcTime + ADAPTOPLX
where ADAPTOPLX is the adaptive correction value for opening. Refer
The definition of predicted electrical interruption time PELORTOLX (in milliseconds) depends on the
selected load type. For transformer loads,
PELORTOLX = INPRIOPLX + ArcTimeTrafoLX + ADAPTOPLX + OPENCOMP
For all other load types,
PELORTOLX =INPRIOPLX+InitArcTime+ ADAPTOPLX+OPENCOMP
where OPENCOMP is the total compensation value for the mechanical opening time.
The same value is also given at the output PELORTLX for opening operations.
The actual electrical interruption time AELORTOLX (in milliseconds) is defined as:
AELORTOLX = Electrical Interruption time (detailed in
The same value is also given at the output AELORTMLX for opening operations.
The actual arcing time AARCTMLX (in milliseconds) is defined as:
302
Section 12.18.7.10.1.
Description
Initial target arcing time for load de-energization without unwanted re-ignitions /
re-strikes
Maximum arcing time of the re-ignition free window, as obtained from type tests
of inductive switching
Target arcing time for interruption of transformer charging current
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Section 12.18.7.10.2)
1MRK 511 557-UEN Rev. A
12.18.7.13.2.
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