ABB Relion 650 Series Applications Manual page 113

1MRK 505 287-UUS B
9.1.3.3 Negative sequence based
The relay setting value
set lower than according to equation 23.
3 2 V PU
EQUATION1757-ANSI V3 EN-US
where:
3V2PU
VBase
The setting of the current limit
3I2PU must be higher than the normal unbalance current that might exist in the system and can be
calculated according to equation 24.
3 2 I PU
=
EQUATION1758-ANSI V3 EN-US
where:
3I2
IBase
9.1.3.4 Zero sequence based
The relay setting value
3V0PU should not be set lower than according to equation 25.
3 0 V PU
EQUATION1759-ANSI V3 EN-US
where:
3V0
VBase
The setting of the current limit
setting of
The setting can be calculated according to equation 26.
Busbar protection REB650
Application manual
3V2PU is given in percentage of the base voltage VBase and should not be
3 2 V
100
= ×
VBase
is the maximal negative sequence voltage during normal operation conditions, plus a margin of 10...20%
is setting of the global base voltage for all functions in the IED.
3I2PU is in percentage of global parameter IBase . The setting of
3 2 I
×
100
IBase
is the maximal negative sequence current during normal operating conditions, plus a margin of 10...20%
is the setting of base current for the function
3V0PU is given in percentage of the global parameter VBase . The setting of
3 0 V
100
= ×
VBase
is the maximal zero sequence voltage during normal operation conditions, plus a margin of 10...20%
is setting of global base voltage all functions in the IED.
3I0PU is done in percentage of the global parameter IBase . The
3I0PU must be higher than the normal unbalance current that might exist in the system.
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Section 9
Secondary system supervision
M13683-17 v6
(Equation 23)
(Equation 24)
M13683-43 v6
(Equation 25)
107