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1MRK 505 370-UEN D
3
U
2
UBase
EQUATION1519 V5 EN-US
where:
U2
UBase
The setting of the current limit
must be higher than the normal unbalance current that might exist in the system and can be
calculated according to equation 85.
3
I
2
EQUATION1520 V5 EN-US
where:
I2
IBase
11.1.3.4
Zero sequence based
The IED setting value
3U0> should not be set lower than the value that is calculated according to equation 86.
3
U
0
EQUATION1521 V4 EN-US
where:
3U0
UBase
The setting of the current limit
be higher than the normal unbalance current that might exist in the system. The setting can be
calculated according to equation 87.
<
3 0
I
=
EQUATION2293 V3 EN-US
where:
3I0<
IBase
Busbar protection REB670
Application manual
U
2
100
3
is the maximal negative sequence voltage during normal operation conditions, plus a margin of
10...20%
is the base voltage for the function according to the setting
I
2
100
IBase
is the maximal negative sequence current during normal operating conditions, plus a margin of
10...20%
is the base current for the function according to the setting
3U0> is given in percentage of the base voltage UBase . The setting of
3
U
0
100
UBase
3
is the maximal zero sequence voltage during normal operation conditions, plus a margin of 10...20%
is the base voltage for the function according to the setting
3 0
I
100
×
IBase
is the maximal zero sequence current during normal operating conditions, plus a margin of 10...20%
is the base current for the function according to the setting
3I2< is in percentage of parameter IBase . The setting of 3I2<
3I0< is done in percentage of IBase . The setting of 3I0< must
Secondary system supervision
GlobalBaseSel
GlobalBaseSel
GlobalBaseSel
GlobalBaseSel
Section 11
(Equation 84)
(Equation 85)
M13683-43 v8
(Equation 86)
(Equation 87)
241
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