Toshiba GR200 Series Instruction Manual page 423

The settings [FL_1R0], [FL_1R1], [FL_1X0], and [FL_1X1] are subject to setting items when
user considers the impedance setting of the Line1_Element.
Impedance for Line JH (Line2_Element setting)
⚫
The settings [FL_2R0], [FL_2R1], [FL_2X0], and [FL_2X1] are subject to setting items when
user considers the impedance setting of the Line2_Element.
Impedance for Line GJ (Line3_Element setting)
⚫
The settings [FL_3R0], [FL_3R1], [FL_3X0], and [FL_3X1] are subject to setting items when
user considers the impedance setting of the Line3_Element.
Compensation setting for earth fault for parallel lines
(iv)
In order to respond to an earth fault, the FL function operates where the entering current is
compensated by the residual current on an adjacent line when the FL function operates for the
parallel lines. In the FL function, the compensation is also available for the entering current
by the computation using impedance.
As a rule, when the FL function operates in the parallel lines, it is recommended that the
entering current should be compensated by the residual current. This is because the measuring
elements can detect the earth fault securely. Thus, the user should set Off for the scheme
switch [FL-Z0B]; mutual impedance in the parallel lines should be set for the settings
[FL_R0m] and [FL_X0m].
Note: The user should use Equation (2.32-28) in order to derive mutual impedance when
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the parallel lines are taken into consideration; the user should set their mutual
impedances for the settings [FL_R0m] and [FL_X0m]. Setting values of the mutual
impedance are also found in Equations (2.32-21) and (2.32-22).
If residual current on the parallel line is not provided, the user should set On for the scheme
switch [FL-Z0B]. In this case, settings for impedance looking in reverse are required together
with the settings [FL_R0m] and [FL_X0m]. These impedances looking in reverse are provided
with both settings [FL_Z0B-L] and [FL_Z0B-R]. The setting [FL_Z0B-L] is referred an
impedance looking in reverse at local-end in zero sequence. The setting [FL_Z0B-R] is referred
an impedance looking in reverse at remote-end in zero sequence. Table 2.32-6 summarizes
their compensation means and settings.
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6F2S1914 (0.49)
GRL200 (Soft 033 & 037)