ABB RELION 670 Series Applications Manual page 137

1MRK 511 364-UUS A
=
V 3I (Z
OB
EQUATION2025-ANSI V1 EN-US
The residual power, measured by the sensitive ground fault protections in A and B will be:
=
S 3V
0A
EQUATION2026-ANSI V1 EN-US
=
S 3V
0B
EQUATION2027-ANSI V1 EN-US
The residual power is a complex quantity. The protection will have a maximum sensitivity in the
characteristic angle RCA. The apparent residual power component in the characteristic angle,
measured by the protection, can be written:
S
0 A ,prot
EQUATION2028-ANSI V1 EN-US
=
S
0 B,prot
EQUATION2029-ANSI V1 EN-US
The angles φ
the station compensated with the characteristic angle RCA.
The protection will use the power components in the characteristic angle direction for
measurement, and as base for the inverse time delay.
The inverse time delay is defined as:
TDSN (3I 3V cos (reference))
=
t
inv
EQUATION2069 V1 EN-US
The function can be set
GlobalBaseSel : It is used to select a GBASVAL function for reference of base values.
RotResU : It is a setting for rotating the polarizing quantity (3V
parameter is set to 180 degrees by default in order to inverse the residual voltage (3V
calculate the reference voltage (-3V
quantity for directionality, it is important to set this parameter correctly.
With the setting
Application manual
× + +
3R Z
0 T ,0 N lineAB,0
×
3I
0A 0
×
3I
0B 0
= × × j
3V 3I cos
0 A 0 A
× × j
3V 3I cos
0 B 0 B
and φ are the phase angles between the residual current and the residual voltage in
A B
f
× × ×
0 0
f
×
3I 3V cos (measured)
0 0
Enabled/Disabled with the setting of Operation .
OpModeSel the principle of directional function is chosen.
)
-jRCADir
e ). Since the reference voltage is used as the polarizing
0
Current protection
) by 0 or 180 degrees. This
0
0
Section 8
(Equation 46)
(Equation 47)
(Equation 48)
(Equation 49)
(Equation 50)
(Equation 51)
) to
131