ABB RELION 670 SERIES REG670 - Zero Sequence Based

100
3
2
23 
VBase
V
PUV
EQUATION1757-ANSI V4 EN-US (Equation 254)
where:
V2PU is the maximal negative 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 3I2PU is in percentage of parameter IBase. The setting
of 3I2PU must be higher than the normal unbalance current that might exist in the
system and can be calculated according to equation
255.
100
2
23 
IBase
I
PUI
EQUATION1758-ANSI V4 EN-US (Equation 255)
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
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
256.
100
3
03
03 
VBase
V
PUV
EQUATION1759-ANSI V4 EN-US (Equation 256)
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
257.
1MRK 502 071-UUS A Section 14
Secondary system supervision
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 513
Application manual