ABB RELION REX640 Technical Manual page 1114

Protection functions
Figure 626: 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.
Alarm level detector
The Alarm level detector compares I_PEAK_INT_x value to
phase or phases in which I_PEAK_INT_x exceeds the setting matches the
start phases setting, the Alarm level detector module activates the Timer 2 module.
Timer 2
The Timer 2 characteristics are according to Definite Time (DT) .When the operation
timer has reached the value of
If a drop-off situation happens, the timer is reset.
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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.
Num of start phases setting is a common setting for both Operate
The
level detector and Alarm level detector.
Alarm delay time , the ALARM output is activated.
The Timer 2 module is internally blocked for one second after the
capacitor bank is connected by detecting the rising edge of the
1MRS759142 F
Alarm start value . If the
Num of
REX640
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