Adaptive Correction - Hitachi Relion 650 Series Technical Manual

Section 12
Monitoring
The actual mechanical closing time AMCOTCLX (in milliseconds) is defined as:
AMCOTCLX = Mechanical closing time
Refer Section
The same value is also given at the output AMCOTMLX for closing operations.
Initial mechanical delay
As explained in
initial mechanical delay at its outputs ITMCDLLX. The individual value for open and close operation
is given at the RCTTOPOLX and RCTTCLOLX outputs, respectively.
Mechanical moving time
As explained in
mechanical movement time at its MCMOVTMLX output. The individual value for open and close
operation is given at the AUXSWTOLX and AUXSWTCLX outputs, respectively.
12.18.7.13

Adaptive correction

Adaptive correction for closing
After some time in service, the properties of the circuit breaker may change. Adaptive correction is
the technique of tracking changes in actual operating times and automatically adjusting the controlled
switching parameters accordingly. ACBMSCBR does this by evaluating the electrical and mechanical
target errors monitored in the last controlled closing operation.
For adaptive correction of electrical making time, the function evaluates the electrical target error
(ε ) as the difference between the predicted and actual making times.
elec
ε = Actual elec. making time – Predicted elec. making time
elec
Similarly, the function evaluates the mechanical target error as the difference between the predicted
and actual mechanical closing times.
ε = Actual mech. closing time – Predicted mech. closing time
mech
This evaluated error is utilized for adjusting the CB release instant in the next controlled closing
operation. For example, the electrical error is compensated in a proportionate way for the
subsequent close operation as shown in
304
12.18.7.10.4.
Section 12.18.7.10.5 and
Section 12.18.7.10.5 and
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Section 12.18.7.10.4, ACBMSCBR evaluates and gives the
Section 12.18.7.10.4, ACBMSCBR evaluates and gives the
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