GE L90 Instruction Manual page 287

5 SETTINGS
Figure 5–77: POWER SWING DETECT QUADRILATERAL OPERATING CHARACTERISTICS
The FlexLogic™ output operands for the power swing detect element are described below:
• The
POWER SWING OUTER
, and
TMR3 PKP POWER SWING TMR4 PKP
testing and special applications.
• The
POWER SWING BLOCK
functions.
• The
POWER SWING UN/BLOCK
to be blocked under power swings, but subsequently unblocked should a fault occur after the power swing blocking
condition has been established.
• The
POWER SWING 50DD
ment has picked up. This operand will trigger on faults occurring during power swing conditions. This includes both
three-phase and single-pole-open conditions.
• The
POWER SWING INCOMING
locus enters the inner characteristic).
• The
POWER SWING OUTGOING
locus leaving the outer characteristic). This operand can be used to count unstable swings and take certain action only
after pre-defined number of unstable power swings.
• The
POWER SWING TRIP
The settings for the power swing detect element are described below:
• POWER SWING FUNCTION: This setting enables and disables the entire power swing detection element. The setting
applies to both power swing blocking and out-of-step tripping functions.
• POWER SWING SOURCE: The source setting identifies the signal source for both blocking and tripping functions.
• POWER SWING SHAPE: This setting selects the shapes (either "Mho" or "Quad") of the outer, middle and, inner char-
acteristics of the power swing detect element. The operating principle is not affected. The "Mho" characteristics use the
left and right blinders.
GE Multilin
X
, ,
POWER SWING MIDDLE POWER SWING INNER
FlexLogic™ operands are auxiliary operands that could be used to facilitate
FlexLogic™ operand shall be used to block selected protection elements such as distance
FlexLogic™ operand shall be used to block those protection elements that are intended
FlexLogic™ operand indicates that an adaptive disturbance detector integrated with the ele-
FlexLogic™ operand indicates an unstable power swing with an incoming locus (the
FlexLogic™ operand indicates an unstable power swing with an outgoing locus (the
FlexLogic™ operand is a trip command.
L90 Line Current Differential System
5.6 GROUPED ELEMENTS
FWD RCA
,
POWER SWING TMR2 PKP
R
5
,
POWER SWING
5-151