Hitachi Relion 670 Series Applications Manual page 150

Section 8
Current protection
Mode: The voltage and current used for the power measurement. The setting possibilities are shown in
table 19.
Table 19:
Set value Mode
A, B, C
Arone
PosSeq
AB
BC
CA
A
B
C
The function has two stages that can be set independently.
With the parameter OpMode1(2) the function can be set Enabled/Disabled.
The function gives trip if the power component in the direction defined by the setting Angle1(2) is smaller
than the set pick up power value Power1(2)
144
Complex power calculation
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Formula used for complex power calculation
* *
= × + × +
S V I V I
A A B B
EQUATION2055-ANSI V1 EN-US
*
= × - ×
S V I V I
AB A BC C
EQUATION2056-ANSI V1 EN-US
*
= × ×
S 3 V I
PosSeq PosSeq
EQUATION2057-ANSI V1 EN-US
* *
= × -
S V ( I I )
AB A B
EQUATION2058-ANSI V1 EN-US
* *
= × -
S V ( I I )
BC B C
EQUATION2059-ANSI V1 EN-US
* *
= × -
S V ( I I )
CA C A
EQUATION2060-ANSI V1 EN-US
*
= × ×
S 3 V I
A A
EQUATION2061-ANSI V1 EN-US
*
= × ×
S 3 V I
B B
EQUATION2062-ANSI V1 EN-US
*
= × ×
S 3 V I
C C
EQUATION2063-ANSI V1 EN-US
1MRK511407-UUS Rev. N
*
×
V I
C C
(Equation 59)
*
(Equation 60)
(Equation 61)
(Equation 62)
(Equation 63)
(Equation 64)
(Equation 65)
(Equation 66)
(Equation 67)
Phasor measurement unit RES670
Application manual