5-166 D60 Line Distance Protection System GE Multilin5.6 GROUPED ELEMENTS 5 SETTINGS5The power swing detect element provides both power swing blocking and out-of-step tripping functions. The element mea-sures the positive-sequence apparent impedance and traces its locus with respect to either two or three user-selectableoperating characteristic boundaries. Upon detecting appropriate timing relations, the blocking and tripping indications aregiven through FlexLogic operands. The element incorporates an adaptive disturbance detector. This function does not trig-ger on power swings, but is capable of detecting faster disturbances – faults in particular – that may occur during powerswings. Operation of this dedicated disturbance detector is signaled via the POWER SWING 50DD operand.The power swing detect element asserts two outputs intended for blocking selected protection elements on power swings:POWER SWING BLOCK is a traditional signal that is safely asserted for the entire duration of the power swing, and POWERSWING UN/BLOCK is established in the same way, but resets when an extra disturbance is detected during the power swing.The POWER SWING UN/BLOCK operand may be used for blocking selected protection elements if the intent is to respond tofaults during power swing conditions.Different protection elements respond differently to power swings. If tripping is required for faults during power swing condi-tions, some elements may be blocked permanently (using the POWER SWING BLOCK operand), and others may be blockedand dynamically unblocked upon fault detection (using the POWER SWING UN/BLOCK operand).MESSAGE POWER SWING OUTERRGT BLD: 100.00 Range: 0.10 to 500.00 ohms in steps of 0.01MESSAGE POWER SWING OUTERLFT BLD: 100.00 Range: 0.10 to 500.00 ohms in steps of 0.01MESSAGE POWER SWING MIDDLERGT BLD: 100.00 Range: 0.10 to 500.00 ohms in steps of 0.01MESSAGE POWER SWING MIDDLELFT BLD: 100.00 Range: 0.10 to 500.00 ohms in steps of 0.01MESSAGE POWER SWING INNERRGT BLD: 100.00 Range: 0.10 to 500.00 ohms in steps of 0.01MESSAGE POWER SWING INNERLFT BLD: 100.00 Range: 0.10 to 500.00 ohms in steps of 0.01MESSAGE POWER SWING PICKUPDELAY 1: 0.030 sRange: 0.000 to 65.535 s in steps of 0.001MESSAGE POWER SWING RESETDELAY 1: 0.050 sRange: 0.000 to 65.535 s in steps of 0.001MESSAGE POWER SWING PICKUPDELAY 2: 0.017 sRange: 0.000 to 65.535 s in steps of 0.001MESSAGE POWER SWING PICKUPDELAY 3: 0.009 sRange: 0.000 to 65.535 s in steps of 0.001MESSAGE POWER SWING PICKUPDELAY 4: 0.017 sRange: 0.000 to 65.535 s in steps of 0.001MESSAGE POWER SWING SEAL-INDELAY: 0.400 sRange: 0.000 to 65.535 s in steps of 0.001MESSAGE POWER SWING TRIPMODE: DelayedRange: Early, DelayedMESSAGE POWER SWING BLK:OffRange: Flexlogic operandMESSAGE POWER SWINGTARGET: Self-ResetRange: Self-Reset, Latched, DisabledMESSAGE POWER SWINGEVENTS: DisabledRange: Disabled, Enabled
