GE T60, Instruction Manual

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GE Multilin T60 Transformer Protection System 5-205
5 SETTINGS 5.6 GROUPED ELEMENTS
5
Figure 5–91: POWER SWING DETECT QUADRILATERAL OPERATING CHARACTERISTICS
The FlexLogic output operands for the power swing detect element are described below:
• The
POWER SWING OUTER
,
POWER SWING MIDDLE
,
POWER SWING INNER
,
POWER SWING TMR2 PKP
,
POWER SWING
TMR3 PKP
, and
POWER SWING TMR4 PKP
FlexLogic operands are auxiliary operands that could be used to facilitate
testing and special applications.
• The
POWER SWING BLOCK
FlexLogic operand shall be used to block selected protection elements such as distance
functions.
• The
POWER SWING UN/BLOCK
FlexLogic operand shall be used to block those protection elements that are intended to
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
FlexLogic operand indicates that an adaptive disturbance detector integrated with the ele-
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
FlexLogic operand indicates an unstable power swing with an incoming locus (the locus
enters the inner characteristic).
• The
POWER SWING OUTGOING
FlexLogic operand indicates an unstable power swing with an outgoing locus (the 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
FlexLogic operand is a trip command.
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.
842735A1.CDR
R
FWD RCA
X
INNER LFT BLD
MIDDLE LFT BLD
OUTER LFT BLD
INNER RGT BLD
MIDDLE RGT BLD
OUTER RGT BLD
REV REACH
QUAD REV REACH M
ID
QUAD REV REACH OUT
FWD REACH
QUAD FWD REACH MID QUAD FWD REACH OUT