Negative Sequence Overcurrent Protection - DEMA 400 Series User Manual

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.
4.3.2.7

46-Negative Sequence Overcurrent Protection

Phase overcurrent protection settings are located on the device under Menu> Protection
Settings> Current Protection Settings> Negative Component Overcurrent Protection.
This protection; It aims to detect unbalanced loads caused by asymmetrical voltages, phase
failures, broken conductor failures. When the protection is active, in case of a fault, the
function starts when the negative component exceeds the current set limit.
Negative Sequence Overcurrent Protection protections are indicated with I2>, I2>>,
I2>>> in IEC 60617 Standards ; with NSI_PIOC_1, NSI_PIOC_2, NSI_PIOC_3 in IEC
61850 Standards; with 46P-I-1, 46P-I-2, 46P-I-3 in IEEE/ANSI Standards.
EŞİK-1 NSI_PIOC_1
EŞİK-2 NSI_PIOC_2
EŞİK-3 NSI_PIOC_3
Negative Component Overcurrent Protection Function Symbols
The menu view is as follows. The menu consists of six lines.
Negative Sequence Overcurrent Protection
IEC 61850 IEC 60617
I2>
I2>>
I2>>>
72
IEEE-ANSI
46-I-1
46-I-2
46-I-3