CHAPTER 5: SETTINGS GROUPED ELEMENTSD60 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 5-2395The power swing detect element provides both power swing blocking and out-of-step tripping functions. The elementmeasures 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 trippingindications are given through FlexLogic operands. The element incorporates an adaptive disturbance detector. Thisfunction does not trigger on power swings, but is capable of detecting faster disturbances—faults in particular—that canoccur during power swings. Operation of this dedicated disturbance detector is signaled via the POWER SWING 50DDoperand.The power swing detect element asserts two operands intended for blocking selected protection elements on powerswings: POWER SWING BLOCK is a traditional signal that is safely asserted for the entire duration of the power swing, andPOWER SWING UN/BLOCK is established in the same way, but resets when an extra disturbance is detected during the powerswing. The POWER SWING UN/BLOCK operand can be used for blocking selected protection elements if the intent is torespond to faults during power swing conditions.Different protection elements respond differently to power swings. If tripping is required for faults during power swingconditions, some elements can be blocked permanently (using the POWER SWING BLOCK operand), and others can beblocked and dynamically unblocked upon fault detection (using the POWER SWING UN/BLOCK operand). POWER SWING INNERLIMIT ANGLE: 60°Range: 40 to 140° in steps of 1 POWER SWING OUTERRGT BLD: 100.00 ΩRange: 0.10 to 500.00 ohms in steps of 0.01 POWER SWING OUTERLFT BLD: 100.00 ΩRange: 0.10 to 500.00 ohms in steps of 0.01 POWER SWING MIDDLERGT BLD: 100.00 ΩRange: 0.10 to 500.00 ohms in steps of 0.01 POWER SWING MIDDLELFT BLD: 100.00 ΩRange: 0.10 to 500.00 ohms in steps of 0.01 POWER SWING INNERRGT BLD: 100.00 ΩRange: 0.10 to 500.00 ohms in steps of 0.01 POWER SWING INNERLFT BLD: 100.00 ΩRange: 0.10 to 500.00 ohms in steps of 0.01 POWER SWING PICKUPDELAY 1: 0.030 sRange: 0.000 to 65.535 s in steps of 0.001 POWER SWING RESETDELAY 1: 0.050 sRange: 0.000 to 65.535 s in steps of 0.001 POWER SWING PICKUPDELAY 2: 0.017 sRange: 0.000 to 65.535 s in steps of 0.001 POWER SWING PICKUPDELAY 3: 0.009 sRange: 0.000 to 65.535 s in steps of 0.001 POWER SWING PICKUPDELAY 4: 0.017 sRange: 0.000 to 65.535 s in steps of 0.001 POWER SWING SEAL-INDELAY: 0.400 sRange: 0.000 to 65.535 s in steps of 0.001 POWER SWING TRIPMODE: DelayedRange: Early, Delayed POWER SWING BLK:OffRange: FlexLogic operand POWER SWINGTARGET: Self-resetRange: Self-reset, Latched, Disabled POWER SWINGEVENTS: DisabledRange: Disabled, Enabled
