ABB Relion 650 Series Technical Manual page 432

Section 13
Monitoring
Set value
for
parameter
"Mode"
4 AB
5 BC
6 CA
7 A
8 B
9 C
* means complex conjugated value
It shall be noted that only in the first two operating modes that is, 1 & 2 the measurement function
calculates exact three-phase power. In other operating modes that is, from 3 to 9 it calculates the
three-phase power under assumption that the power system is fully symmetrical. Once the
complex apparent power is calculated then the P, Q, S, & PF are calculated in accordance with the
following formulas:
=
P Re( )
EQUATION1403 V1 EN-US
426
Formula used for complex,
three-phase power calculation
(
= × * -
S V I
AB A
(Equation 66)
EQUATION1567 V1 EN-US
(
= × * -
S V I
BC B
(Equation 68)
EQUATION1569 V1 EN-US
(
= × -
*
S V I
CA C
(Equation 70)
EQUATION1571 V1 EN-US
= × ×
*
S 3 V I
A A
(Equation 72)
EQUATION1573 V1 EN-US
= × ×
*
S 3 V I
B B
(Equation 74)
EQUATION1575 V1 EN-US
= × ×
*
S 3 V I
C C
(Equation 76)
EQUATION1577 V1 EN-US
S
© Copyright 2011 ABB Power Grids. All rights reserved
Formula used for voltage
and current magnitude
calculation
)
=
V V
*
I
AB
B
(
= +
I I
A
EQUATION1568 V1 EN-US
)
=
V V
*
I
BC
C
(
= +
I I
B
EQUATION1570 V1 EN-US
)
=
V V
*
I
CA
A
(
= +
I I
C
EQUATION1572 V1 EN-US
= ×
V 3 V
=
I I
A
EQUATION1574 V1 EN-US
= ×
V 3 V
=
I I
B
EQUATION1576 V1 EN-US
= ×
V 3 V
=
I I
C
EQUATION1578 V1 EN-US
Comment
Used when only V
phase voltage is available
)
I / 2
B
(Equation 67)
Used when only V
phase voltage is available
)
I / 2
C
(Equation 69)
Used when only V
phase voltage is available
)
I / 2
A
(Equation 71)
Used when only V
ground voltage is available
A
(Equation 73)
Used when only V
ground voltage is available
B
(Equation 75)
Used when only V
ground voltage is available
C
(Equation 77)
Line distance protection REL650
1MRK 506 326-UUS B
phase-to-
AB
phase-to-
BC
phase-to-
CA
phase-to-
A
phase-to-
B
phase-to-
C
(Equation 78)
Technical manual