Hitachi Relion 650 Series Technical Manual page 325

1MRK 511 557-UEN Rev. A
Order
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14
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Technical Manual
Mode Mode number
N/A 1457
Redundant 1473
Operation
Failed 1474
Operation
CB in 1456
Intermediate
Position with
Alarm
CB in 1450
Intermediate
Position
CB Unstable 1455
with Alarm
CB Unstable 1449
Bypassed 1443
Operation
Re-ignition 1673
Reduced 1453
Accuracy
Operation with
Alarm
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Description of conditions
• When electrical status cannot be used (that is the applicable
setting FeedbackSigC or FeedbackSigO in ACBMSCBR is
selected as "None") and mechanical feedback is unavailable
(either mechanical feedback is disabled OR mechanical
feedback is enabled with no auxiliary contacts available).
• This information is received via co-ordination input
CRDACOPLx.
• If a close command is received when the circuit breaker is
already monitored in closed condition OR
• If an open command is received when the circuit breaker is
already monitored in open condition
• The circuit breaker position is evaluated in the ACBMSCBR
function and the indication of redundant operation is received
by the OPLOGTRIG function via co-ordination input
CRDACOPLx.
• When a command is issued and no feedback of mechanical or
electrical status change is detected within 300ms (irrespective
of the system frequency) from the time the output command is
issued by the IED.
• A failed operation is monitored by the function via co-ordination
input CRDACOPLx.
• When the mode 1450 has electrical target error* alarms
detected above the specified limits.
• When any operation is performed and after that electrical CB
status and mechanical CB status are opposite to each other.
• A CB intermediate position is monitored via co-ordination input
CRDACOPLx.
• When the mode 1449 has electrical target error* alarms
detected above the specified limits.
• When the mechanical operating times are inconsistent (varying
by 10% over previous operating time) for two consecutive
operations.
• Close operations are compared to close operations only, and
likewise for open operations.
• This mode may be declared for several operations till the
CBUnstable condition is reset.
• A CB's unstable condition is monitored via co-ordination input
CRDACOPLx.
• When the controlled switching commands to the CB are
emitted without point-on-wave synchronization, all three phases
simultaneously.
• A bypassed operation is monitored via co-ordination input
CRDACOPLx.
• When the difference between actual arcing time and predicted
arcing time is more than 2 ms.
• Reignition is monitored by the function via co-ordination input
CRDACOPLx.
• When the mode 1442 has electrical target error* alarms
detected above the specified limits.
Section 12
Monitoring
319