ABB RELION 670 SERIES REG670 Applications Manual page 395

1MRK 502 071-UUS A
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
= × +
V 3I (Z 3R )
0 A 0 T ,0 N
EQUATION2024-ANSI V1 EN-US
= × +
V 3I (Z 3R
OB 0 T ,0 N
EQUATION2025-ANSI V1 EN-US
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-US
= ×
S 3V 3I
0B 0B 0
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 3V 3I cos
0 A ,prot 0 A 0
EQUATION2028-ANSI V1 EN-US
= × ×
S 3V 3I cos
0 B,prot 0 B 0
EQUATION2029-ANSI V1 EN-US
The angles φ and φ are the phase angles between the residual current and the
A B
residual 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-US
The function can be set Enabled/Disabled with the setting of Operation.
+
Z )
lineAB,0
j
A
j
B
f
Section 9
Current protection
(Equation 194)
(Equation 195)
(Equation 196)
(Equation 197)
(Equation 198)
(Equation 199)
(Equation 200)
389