GE T60 Instruction Manual page 408
Transformer protection system
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GROUPED ELEMENTS
5
The power swing detect element provides both power swing blocking and out-of-step tripping functions. The element
measures the positive-sequence apparent impedance and traces its locus with respect to either two or three user-
selectable operating characteristic boundaries. Upon detecting appropriate timing relations, the blocking and/or tripping
indications are given through FlexLogic operands. The element incorporates an adaptive disturbance detector. This
function does not trigger on power swings, but is capable of detecting faster disturbances—faults in particular—that can
occur during power swings. Operation of this dedicated disturbance detector is signaled via the
operand.
The power swing detect element asserts two operands intended for blocking selected protection elements on power
swings:
POWER SWING BLOCK
POWER SWING UN/BLOCK
swing. The
POWER SWING UN/BLOCK
respond to faults during power swing conditions.
Different protection elements respond differently to power swings. If tripping is required for faults during power swing
conditions, some elements can be blocked permanently (using the
blocked and dynamically unblocked upon fault detection (using the
5-226
POWER SWING INNER
LIMIT ANGLE: 60°
POWER SWING OUTER
RGT BLD: 100.00 Ω
POWER SWING OUTER
LFT BLD: 100.00 Ω
POWER SWING MIDDLE
RGT BLD: 100.00 Ω
POWER SWING MIDDLE
LFT BLD: 100.00 Ω
POWER SWING INNER
RGT BLD: 100.00 Ω
POWER SWING INNER
LFT BLD: 100.00 Ω
POWER SWING PICKUP
DELAY 1: 0.030 s
POWER SWING RESET
DELAY 1: 0.050 s
POWER SWING PICKUP
DELAY 2: 0.017 s
POWER SWING PICKUP
DELAY 3: 0.009 s
POWER SWING PICKUP
DELAY 4: 0.017 s
POWER SWING SEAL-IN
DELAY: 0.400 s
POWER SWING TRIP
MODE: Delayed
POWER SWING BLK:
Off
POWER SWING
TARGET: Self-reset
POWER SWING
EVENTS: Disabled
is a traditional signal that is safely asserted for the entire duration of the power swing, and
is established in the same way, but resets when an extra disturbance is detected during the power
operand can be used for blocking selected protection elements if the intent is to
Range: 40 to 140° in steps of 1
Range: 0.10 to 500.00 ohms in steps of 0.01
Range: 0.10 to 500.00 ohms in steps of 0.01
Range: 0.10 to 500.00 ohms in steps of 0.01
Range: 0.10 to 500.00 ohms in steps of 0.01
Range: 0.10 to 500.00 ohms in steps of 0.01
Range: 0.10 to 500.00 ohms in steps of 0.01
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: Early, Delayed
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
operand), and others can be
POWER SWING BLOCK
operand).
POWER SWING UN/BLOCK
T60 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
POWER SWING 50DD
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