Zero Sequence Based - ABB REG670 Applications Manual

1MRK 502 071-UEN -
14.2.3.4
14.2.3.5
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
I 2
 
3 I 2 100
IBase
EQUATION1520 V5 EN
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

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.
3 U 0
 
3 U 0 100
UBase 3
EQUATION1521 V4 EN
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
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 I
<
3 0 I 100
= ×
IBase
EQUATION2293 V3 EN
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
Delta U and delta I
Set the operation mode selector OpDUDI to On if the delta function shall be in
operation.
Secondary system supervision
GlobalBaseSel
GlobalBaseSel
GlobalBaseSel
Section 14
(Equation 262)
(Equation 263)
(Equation 264)
475