Negative Sequence Based; Zero Sequence Based - ABB Relion 670 Series Applications Manual

Section 12
Secondary system supervision
V0I0 AND V2I2 which gives that both negative and zero sequence algorithms are activated and
working in an AND-condition, that is, both algorithms must give condition for block in order to
activate the output signals BLKV or BLKZ.
12.2.3.3

Negative sequence based

The relay setting value
set lower than the value that is calculated according to equation 112.

3 V 2 PU
EQUATION1757-ANSI V4 EN-US
where:
V2PU
VBase
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 113.

3 I 2 PU
EQUATION1758-ANSI V4 EN-US
where:
I2
IBase
12.2.3.4

Zero sequence based

The IED setting value
3V0PU should not be set lower than the value that is calculated according to equation 114.
3 V 0 PU
EQUATION1759-ANSI V4 EN-US
where:
3V0
VBase
248
3V2PU is given in percentage of the base voltage VBase and should not be
V 2

100
VBase 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
3I2PU is in percentage of parameter IBase . The setting of 3I2PU
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
3V0PU is given in percentage of the base voltage VBase . The setting of
3 V 0
 
100
VBase 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
GlobalBaseSel
GlobalBaseSel
GlobalBaseSel
Application manual
1MRK 511 358-UUS A
M13683-17 v9
(Equation 112)
(Equation 113)
M13683-43 v8
(Equation 114)