GE N60 Instruction Manual page 287

CHAPTER 5: SETTINGS
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 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 outputs intended for blocking selected protection elements on power swings:
is a traditional signal that is safely asserted for the entire duration of the power swing, and
POWER SWING BLOCK
is established in the same way, but resets when an extra disturbance is detected during the power swing.
SWING UN/BLOCK
The operand is used for blocking selected protection elements if the intent is to respond to faults
POWER SWING UN/BLOCK
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
View the operating characteristic and logic figures along with the following discussion to understand the operation of the
element.
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
POWER SWING OUTER

RGT BLD: 100.00 
POWER SWING OUTER

LFT BLD: 100.00 
POWER SWING MIDDLE

RGT BLD: 100.00 
POWER SWING MIDDLE

LFT BLD: 100.00 
POWER SWING INNER

RGT BLD: 100.00 
POWER SWING INNER

LFT BLD: 100.00 
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
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
GROUPED ELEMENTS
POWER SWING 50DD
POWER
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