100
3
2
2
3
UBase
U
U
EQUATION1519 V5 EN-US
(Equation 553)
where:
U2
is the maximal negative sequence voltage during normal operation conditions, plus a margin of
10...20%
UBase is the base voltage for the function according to the setting GlobalBaseSel
The setting of the current limit
3I2< is in percentage of parameter IBase. The setting of 3I2<
must be higher than the normal unbalance current that might exist in the system and can be
calculated according to equation
.
100
2
2
3
IBase
I
I
EQUATION1520 V5 EN-US
(Equation 554)
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
13.2.3.4
Zero sequence based
M13683-43 v8
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
.
100
3
0
3
0
3
UBase
U
U
EQUATION1521 V4 EN-US
(Equation 555)
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
GlobalBaseSel
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
.
3 0
3 0
100
I
I
IBase
=
×
<
EQUATION2293 V3 EN-US
(Equation 556)
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
GlobalBaseSel
Section 13
1MRK 505 343-UEN B
Secondary system supervision
514
Application manual
Summary of Contents for Relion 670 series
Page 1: ...RELION 670 SERIES Line differential protection RED670 Version 2 1 IEC Application manual...
Page 2: ......
Page 40: ...34...
Page 64: ...58...
Page 150: ...144...
Page 406: ...400...
Page 472: ...466...
Page 494: ...488...
Page 512: ...506...
Page 524: ...518...
Page 604: ...598...
Page 686: ...680...
Page 718: ...712...
Page 722: ...716...
Page 758: ...752...
Page 759: ...753...