Circutor CVMk2 Series Manuale Utente Scaricare il pdf (Pagina 33)

CVM

CONFIGURATION

The cursor will be positioned over the rst digit, corresponding to the largest value. Use the

left/right arrow buttons to navigate from one digit to another and the up/down arrow buttons to

increase/decrease the value of the digit where the cursor is currently positioned.

To save the modied parameters to memory, press OK (F4) before exiting. If saving the changes

is not desired, press ESC (F3).

Parameters that can be congured on this screen are:

• SWELL Thr: This corresponds to the threshold value, in %, to detect an overvoltage event.

• SAG Thr: This corresponds to the threshold value, in %, to detect a hole event.

• iNTEr. Thr: This corresponds to the threshold value, in %, to detect a short circuit event.

• SWELL Hys: Hysteresis, in %, over the programmed value in the detection threshold.

• SAG Hys: Hysteresis, in %, over the programmed value in the detection threshold.

• iNTER. Hys: Hysteresis, in %, over the programmed value in the detection threshold.

Inter Thr.

Sag Thr.

Swell Thr.

V nom

Swell Hys

Inter Hys

10%

90%

110%

Sag HysSag Hys

In the graph is showed an example of an Swell voltage in the interval t 0. The time of that

overvoltage event is the time that the signal is over the swell value (usually 110%) plus the time

of the hysteresis for this swell (usually 2%).

Example graph:

The value of the hysteresis is always, in part, more restrictive. It is not a

symmetric hysteresis. The detection value is over the programmed value, as a

%. The hysteresis applies in the disconnection or the disappearance of the event.

If the event is for a maximum (over v Thd), the hysteresis will be applied when

the signal drops. If the event is for a minimum (hole Thd and short circuit Thd),

the hysteresis will be applied when the signal increases again.

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Circutor CVMk2 Series Manuale Utente Pagina 33