Figure 409: The behavior of the IDMT timer and the output ST_OVLOD
The ST_DUR_OVLOD output indicates the percentage ratio of the start situation and
the operation time in the Timer 1 module and is available in the monitored data
view.
The Timer 1 module is internally blocked for one second after the
capacitor bank is connected by detecting the rising edge of the
CB_CLOSED signal. The CB_CLOSED signal is True when the CB position
is closed.
Alarm level detector
The Alarm level detector compares I_PEAK_INT_x value to
Alarm start value
. If the
phase or phases in which I_PEAK_INT_x exceeds the setting matches the
Num of
start phases
setting, the Alarm level detector module activates the Timer 2 module.
The
Num of start phases
setting is a common setting for both Operate
level detector and Alarm level detector.
Timer 2
The Timer 2 characteristics are according to Definite Time (DT) .When the operation
timer has reached the value of
Alarm delay time
, the ALARM output is activated.
If a drop-off situation happens, the timer is reset.
The Timer 2 module is internally blocked for one second after the
capacitor bank is connected by detecting the rising edge of the
1MRS757644 H Protection functions
620 series
Technical Manual
777
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