ABB Relion 650 Series Technical Manual page 232

Section 6
Current protection
Table 156: Complex power calculation
Set value:
A, B, C
Arone
PosSeq
AB
BC
CA
A
B
C
The active and reactive power is available from the function and can be used for monitoring and
fault recording.
The component of the complex power S = P + jQ in the direction
angle is 0° the active power component P is calculated. If this angle is 90° the reactive power
component Q is calculated.
The calculated power component is compared to the power pick up setting
directional underpower protection, a pickup signal PICKUP1(2) is activated if the calculated power
component is smaller than the pick up value. For directional overpower protection, a pickup signal
PICKUP1(2) is activated if the calculated power component is larger than the pick up value. After a
set time delay
activation of any of the two stages a common signal PICKUP will be activated. At trip from any of
the two stages also a common signal TRIP will be activated.
226
Mode
TripDelay1(2) a trip TRIP1(2) signal is activated if the pickup signal is still active. At
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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
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
Angle1(2) is calculated. If this
1MRK 506 326-UUS B
*
×
V I
C C
(Equation 40)
*
C
(Equation 41)
(Equation 42)
(Equation 43)
(Equation 44)
(Equation 45)
(Equation 46)
(Equation 47)
(Equation 48)
Power1(2) . For
Line distance protection REL650
Technical manual