Measurement Mode - DEMA 400 Series User Manual

4.3.2.4.12

Measurement Mode

The measurement mode can be selected as RMS or Basic Component. The basic component
measurement is selected to use harmonic-free measured values. The RMS measurement is
selected to use the values calculated by taking the square root of the mean of the squares of
the measured values. This value is also called Active or Effective value.
67N – Directional Earth Overcurrent Protection
4.3.2.5
Directional Earth Overcurrent Protection are located under this sections: Main Menu>
Protection Settings> Current Protection Settings> Directional Earth Overcurrent Protection
Directional earth overcurrent protection is activated when the earth current exceeds the
defined current threshold and the angle between the currents is within the working zone
setting. Ie>→, I
>>→, I
e
through the neutral current transformer. I
sum of the phase currents and works according to the neutral current value. In this way, the
device provides directional earth overcurrent protection without connecting a neutral current
transformer.
Directional phase overcurrent protection is indicated by Ie>→, Ie>>→, Ie>>>→, Ie_d>→,
Ie_d>>→ in IEC 60617 Standards; DEI_PIOC_1, DEI_PIOC_2, DEI_PIOC_3,
DEDI_PIOC_1, DEDI_PIOC_2 in IEC 61850; 67N-I-1, 67N-I-2, 67N-I-3, 67N-DI-1, 67N-
DI-2 in IEEE/ANSI Standards
EŞİK-1 DEI_PIOC_1
EŞİK-2 DEI_PIOC_2
EŞİK-3 DEI_PIOC_3
EŞİK-4 DEDI_PIOC_1
EŞİK-5 DEDI_PIOC_2
Directional Earth Overcurrent Protection Function Symbols
The menu images are as follows.
>>>→ thresholds operate according to the current value passing
e
>→ I
e_d
Directional Earth Overcurrent Protection
IEC 61850
>>→ thresholds are calculated from the
e_d
IEC 60617 IEEE-ANSI
Ie>→
67N-I-1
Ie>>→
67N-I-2
Ie>>>→
67N-I-3
Ie_d>→
67N-DI-1
Ie_d>>→
67N-DI-2
66