ABB REL650 Applications Manual page 225

1MRK 506 334-UUS A
Application manual
= × +
V 3I (Z 3R )
0 A 0 T ,0 N
EQUATION2024-ANSI V1 EN
= × +
V 3I (Z 3R
OB 0 T ,0 N
EQUATION2025-ANSI V1 EN
The residual power, measured by the sensitive ground-fault protections in A and B will be:
= ×
S 3V 3I
0A 0A 0
EQUATION2026-ANSI V1 EN
= ×
S 3V 3I
0B 0B 0
EQUATION2027-ANSI V1 EN
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 3V 3I cos
0 A ,prot 0 A 0
EQUATION2028-ANSI V1 EN
= × ×
S 3V 3I cos
0 B,prot 0 B 0
EQUATION2029-ANSI V1 EN
The angles φ and φ are the phase angles between the residual current and the residual
A B
voltage in 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 0 0
inv f
×
3I 3V cos (measured)
0 0
EQUATION2069 V1 EN
GlobalBaseSel: Selects the global base value group used by the function to define (IBase),
(VBase) and (SBase).
+
Z )
lineAB,0
j
A
j
B
f
Section 7
Current protection
(Equation 132)
(Equation 133)
(Equation 134)
(Equation 135)
(Equation 136)
(Equation 137)
(Equation 138)
219