1MAC309294-MB F Section 5
Control functions
RER620 303
Technical Manual
When SOTF is detected, the parameter SOTF is active.
The frequent-operation counter is intended for blocking the autoreclose function in cases
where the fault causes repetitive autoreclose sequences during a short period of time. For
instance, if a tree causes a short circuit and, as a result, there are autoreclose shots within
a few minutes interval during a stormy night. These types of faults can easily damage the
circuit breaker if the AR function is not locked by a frequent-operation counter.
The frequent-operation counter has three settings:
• Frq Op counter limit
• Frq Op counter time
• Frq Op recovery time
The Frq Op counter limit setting defines the number of reclose attempts that are allowed
during the time defined with the Frq Op counter time setting. If the set value is reached
within a pre-defined period defined with the Frq Op counter time setting, the AR function
goes to lockout when a new shot begins, provided that the counter is still above the set
limit. The lockout is released after the recovery time has elapsed. The recovery time can
be defined with the Frq Op recovery time setting.
If the circuit breaker is manually closed during the recovery time, the reclaim time is
activated after the recovery timer has elapsed.
5.2.4.3 Output Interface with SDAOGGIO Block
This consists of the function block SDAOGGIO, shown in Figure 158 below.
If the Manual close mode setting is set to FALSE and the circuit breaker
has been manually closed during an autoreclose shot, the AR unit goes to
an immediate lockout.
If the Manual close mode setting is set to TRUE and the circuit breaker has
been manually closed during an autoreclose shot (the INPRO is active), the
shot is considered as completed.
When SOTF starts, reclaim time is restarted, provided that it is running.
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