ABB REG670 - Zero Sequence Based

100
2
23 
IBase
I
I
EQUATION1520 V5 EN (Equation 262)
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
14.2.3.4 Zero sequence based
The IED setting value 3U0> is given in percentage of the base voltage UBase. The
setting of 3U0> should not be set lower than the value that is calculated according to
equation 263.
100
3
03
03 
UBase
U
U
EQUATION1521 V4 EN (Equation 263)
where:
3U0 is the maximal zero sequence voltage during normal operation conditions, plus a margin of
10...20%
UBase is the base voltage for the function according to the setting GlobalBaseSel
The setting of the current limit 3I0< is done in percentage of IBase. The setting of
3I0< must be higher than the normal unbalance current that might exist in the system.
The setting can be calculated according to equation 264.
3 0
3 0 100
I
I
IBase
= × <
EQUATION2293 V3 EN
(Equation 264)
where:
3I0< 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
14.2.3.5 Delta U and delta I
Set the operation mode selector OpDUDI to On if the delta function shall be in
operation.
1MRK 502 071-UEN - Section 14
Secondary system supervision
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 475
Application manual