GE UR Series L90 Instruction Manual page 320

5.6 GROUPED ELEMENTS
5
Figure 5–87: 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
be blocked under power swings, but subsequently unblocked should a fault occur after the power swing blocking con-
dition 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
enters the inner characteristic).
• The
POWER SWING OUTGOING
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.
5-182
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 to
FlexLogic operand indicates that an adaptive disturbance detector integrated with the ele-
FlexLogic operand indicates an unstable power swing with an incoming locus (the locus
FlexLogic operand indicates an unstable power swing with an outgoing locus (the locus
FlexLogic operand is a trip command.
L90 Line Current Differential System
FWD RCA
,
POWER SWING TMR2 PKP
5 SETTINGS
R
,
POWER SWING
GE Multilin