Phase-Phase Voltages - DEMA 400 Series User Manual

4.2.7

Phase-Phase Voltages

" Phase-Phase Voltage " values displayed on the screen is used according to user or field
requirements. In this screen, V
frequency values are given. The display for Phase-Neutral Voltages is as follows:
4.2.8 I - I - I
0 1 2
I0 - I1 - I2 currents refer to zero, positive and negative sequence currents respectively.
Unbalanced currents flowing in a certain sequence in the system; where positive is shown as
negative and zero sequence currents. The use of these currents in short circuit calculations
increases the efficiency.
The% (I2 / I1) value displayed on the screen is used when proportional control and protection
against unbalanced load is required. The display of currents, phase angles and frequency is
shown below:
, V , V voltage values and their phase angles and
RS TS TR
Image 4-9 Phase-Neutral Voltages
– I – I
I
0 1
34
2