Protection - DEMA 400 Series User Manual

4.3.3.3.1

Protection

It can be selected 'Active' or 'Passive'.According to the treshold situation, the protection is
activated in the active state and disabled in the passive state.
4.3.3.3.2 Start Value
It is the screen where the voltage value of U2 is set when the protection is active.It can select
in range of (1-130)V
4.3.3.3.3 Operate Delay
The operation delay is the value that determines the characteristic of the protection curve with
the delay type. In the case of voltage protection, the delay type must be DMT. This delay is
expressed by the term tI >> and may take a value between (0.02 - 120) s.
4.3.3.3.4 Reset Delay
According to the menu settings, exceeding 200V and without breaker tripping, It was selected
to count the DMT (constant time) reset time (0.04 s) after the voltage exceeds 200V. Thus,
after the current falls below the threshold, 40 ms will be counted. If the threshold is not
Negative Component Overvoltage Protection Display
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