ABB RELION 670 Series Applications Manual page 431

1MRK 504 152-UEN B
=
S 3U
0 A
EQUATION1951 V1 EN-US
=
S 3U
0 B
EQUATION1952 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
EQUATION1953 V1 EN-US
=
S
0 B,prot
EQUATION1954 V1 EN-US
The angles φ
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:
kSN (3I 3U
=
t
inv
EQUATION1942 V2 EN-US
The function can be set
Common base IED values for primary current (IBase), primary voltage (UBase) and primary
power (SBase) are set in a Global base values for settings function GBASVAL.
GlobalBaseSel : It is used to select a GBASVAL function for reference of base values.
RotResU : It is a setting for rotating the polarizing quantity ( 3U
parameter is set to 180 degrees by default in order to inverse the residual voltage ( 3U
calculate the reference voltage (-3U
polarizing quantity for directionality, it is important to set this parameter correctly.
With the setting
OpMode set to 3I0cosfi the current component in the direction equal to the characteristic
With
RCADir has the maximum sensitivity. The characteristic for RCADir is equal to 0° is shown
angle
in Figure 262.
Application manual
×
3I
0 A 0
×
3I
0 B 0
j
= × ×
3U 3I cos
0 A 0 A
j
× ×
3U 3I cos
0 B 0 B
and φ are the phase angles between the residual current and the residual
A B
× × × j
cos (reference))
0 0
× × j
3I 3U cos (measured)
0 0
On/Off with the setting of Operation .
OpMode the principle of directional function is chosen.
-jRCADir
e ). Since the reference voltage is used as the
0
Current protection
(Equation 453)
(Equation 454)
(Equation 455)
(Equation 456)
(Equation 457)
) by 0 or 180 degrees. This
0
Section 8
) to
0
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