ABB Relion 670 series - Page 540

0A 0 T,0 N
V 3I (Z 3R )= × +
EQUATION2024-ANSI V1 EN (Equation 474)
OB 0 T,0 N lineAB,0
V 3I (Z 3R Z )= × + +
EQUATION2025-ANSI V1 EN (Equation 475)
The residual power, measured by the sensitive ground fault protections in A and B will be:
0A 0A 0
S 3V 3I= ×
EQUATION2026-ANSI V1 EN (Equation 476)
0B 0B 0
S 3V 3I= ×
EQUATION2027-ANSI V1 EN (Equation 477)
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:
0A,prot 0A 0 A
S 3V 3I cos= × × j
EQUATION2028-ANSI V1 EN (Equation 478)
0B,prot 0B 0 B
S 3V 3I cos= × × j
EQUATION2029-ANSI V1 EN (Equation 479)
The angles φ
A
and φ
B
are the phase angles between the residual current and the 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:
0 0
inv
0 0
TDSN (3I 3V cos (reference))
t
3I 3V cos (measured)
f
f
× × ×
=
×
EQUATION2069 V1 EN (Equation 480)
The function can be set Enabled/Disabled with the setting of Operation.
GlobalBaseSel: It is used to select a GBASVAL function for reference of base values.
Section 9 1MRK 506 369-UUS -
Current protection
534 Line distance protection REL670 2.2 ANSI
Application manual