3 2
3 2
100
=
×
V
V PU
VBase
EQUATION1757-ANSI V3 EN
(Equation 86)
where:
3V2PU is the maximal negative sequence voltage during normal operation conditions, plus a margin of
10...20%
VBase is setting of the global base voltage for all functions in the IED.
The setting of the current limit
3I2PU
is in percentage of global 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
3 2
3 2
100
=
×
I
I PU
IBase
EQUATION1758-ANSI V3 EN
(Equation 87)
where:
3I2
is the maximal negative sequence current during normal operating conditions, plus a margin of
10...20%
IBase
is the setting of base current for the function
9.2.3.4
Zero sequence based
The relay setting value
3V0PU
is given in percentage of the global parameter
VBase
. The
setting of
3V0PU
should not be set lower than according to equation
.
3 0
3 0
100
=
×
V
V PU
VBase
EQUATION1759-ANSI V3 EN
(Equation 88)
where:
3V0
is the maximal zero sequence voltage during normal operation conditions, plus a margin of 10...20%
VBase is setting of global base voltage all functions in the IED.
The setting of the current limit
3I0PU
is done in percentage of the global parameter
IBase
. The setting of
3I0PU
must be higher than the normal unbalance current that might
exist in the system. The setting can be calculated according to equation
.
1MRK 511 286-UUS A
Section 9
Secondary system supervision
175
Application manual
Содержание REC650 ANSI
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