ABB REB670 - Zero Sequence Based

100
2
23 
IBase
I
PUI
EQUATION1758-ANSI V4 EN-US (Equation 83)
where:
I2 is the maximal negative sequence current during normal operating conditions, plus a margin of
10...20%
IBase is the base current for the function according to the setting GlobalBaseSel
11.1.3.4 Zero sequence based
M13683-43 v8
The IED setting value 3V0PU is given in percentage of the base voltage VBase. The
setting of 3V0PU should not be set lower than the value that is calculated according to
equation
84.
100
3
03
03 
VBase
V
PUV
EQUATION1759-ANSI V4 EN-US (Equation 84)
where:
3V0 is the maximal zero sequence voltage during normal operation conditions, plus a margin of
10...20%
VBase is the base voltage for the function according to the setting
GlobalBaseSel
The setting of the current limit 3I0PU is done in percentage of IBase. The setting of
pickup must be higher than the normal unbalance current that might exist in the
system. The setting can be calculated according to equation 85.
3 0
3 0 100= ×
I
I PU
IBase
EQUATION2293-ANSI V2 EN-US (Equation 85)
where:
3I0PU is the maximal zero sequence current during normal operating conditions, plus a margin of
10...20%
IBase is the base current for the function according to the setting GlobalBaseSel
Section 11 1MRK 505 370-UUS A
Secondary system supervision
288 Busbar protection REB670 2.2 ANSI
Application manual