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2.32.6 Setting procedure
The FL has a number of operation features and these features are provided with settings,
which can be keyed from the IED screen for operation. (See Chapter
User interface: Setting
)
(i) FL execution
The FL calculation is carried out when On is set for setting [FL_EN]. The two calculation
groups (which are described in section2.32.1 and section 2.32.2) are subject to this setting.
(ii) FL direction
Note: Set of FL direction is only available for the
FL calculation with data at a local-
terminal only
.
When considering the fault determination, user can choose the direction in either forward or
reverse. When required to respond to the fault in forward, user should select the direction in
forward if the forward is selected in the elements of the other protection functions
corresponding to the FL; otherwise, the FL calculation fails to start.
The setting [FL_Dir] is provided to select the FL direction; and Forward is set when a
fault is supposed to arise in forward. Inversely, set Reverse for it when a fault is supposed to
arise in reverse direction. Figure 2.32-9 shows the direction of a fault.
Figure 2.32-9 Forward fault and reverse fault
(iii) Selection of either Matrix or Symmetrical component; and impedance
settings
As described in section 2.32.1(i)-3, the FL calculation is carried out in symmetrical component;
hence, setting the line impedance in symmetrical components may be required, but user can
also set the line impedance in resistive and reactive (matrix) components. Thus, prior to setting
of impedance, user should select either Matrix or Symmetrical with scheme switch [FL_ImpSet].
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