Zero Sequence Based - Hitachi Relion 670 Series Applications Manual

Section 13
Secondary system supervision

3 V 2 PU
EQUATION1757-ANSI V4 EN-US
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 100.

3 I 2 PU
EQUATION1758-ANSI V4 EN-US
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

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 101.
3 V 0 PU
EQUATION1759-ANSI V4 EN-US
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 102.
3 0 I PU
EQUATION2293-ANSI V2 EN-US
where:
3I0PU 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
190
V 2

100
VBase 3
I 2

100
IBase
3 V 0
 
100
VBase 3
3 0 I
100
= ×
IBase
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1MRK511407-UUS Rev. N
(Equation 99)
(Equation 100)
M13683-43 v8
(Equation 101)
(Equation 102)
Phasor measurement unit RES670
Application manual