ABB 615 Series - Page 732

Power calculation
This module calculates the apparent power based on the selected voltages and currents.
The Measurement mode setting determines which voltages and currents are used. It is also
possible to use positive-sequence components for calculating the apparent power which
makes the determination of power insensitive to a possible asymmetry in currents or
voltages and corresponds to the real load on the prime mover of the generator.
Table 629: Power calculation
Measurement mode setting Power calculation
PhsA, PhsB, PhsC
S V I V I V I
a
a
b
b
c
c
= ⋅ + + + ⋅
* * *
P S=
( )
Re
Arone
S V I V I
ab
a
bc
c
= ⋅ − ⋅
* *
P S=
( )
Re
Pos Seq
S V I= ⋅ ⋅3
1
1
*
P S=
( )
Re
PhsAB
S V I I
ab
a b
= ⋅ ⋅ −
( )
3
* *
P S=
( )
Re
PhsBC
S V I I
bc
b c
= ⋅ ⋅ −
( )
3
* *
P S=
( )
Re
PhsCA
S V I I
ca
c a
= ⋅ ⋅ −
( )
3
* *
P S=
( )
Re
PhsA
S V I
a
a
= ⋅ ⋅3
*
P S=
( )
Re
PhsB
S V I
b
b
= ⋅ ⋅3
*
P S=
( )
Re
PhsC
S V I
c
c
= ⋅ ⋅3
*
P S=
( )
Re
Section 4 1MAC059074-MB A
Protection functions
726 615 series ANSI
Technical Manual