GE Multilin D30 Line Distance Protection System 5-1635 SETTINGS 5.6 GROUPED ELEMENTS5Figure 5–72: POWER SWING DETECT QUADRILATERAL OPERATING CHARACTERISTICSThe 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 SWINGTMR3 PKP, and POWER SWING TMR4 PKP FlexLogic operands are auxiliary operands that could be used to facilitatetesting and special applications.• The POWER SWING BLOCK FlexLogic operand shall be used to block selected protection elements such as distancefunctions.• The POWER SWING UN/BLOCK FlexLogic operand shall be used to block those protection elements that are intended tobe 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 boththree-phase and single-pole-open conditions.• The POWER SWING INCOMING FlexLogic operand indicates an unstable power swing with an incoming locus (the locusenters the inner characteristic).• The POWER SWING OUTGOING FlexLogic operand indicates an unstable power swing with an outgoing locus (the locusleaving the outer characteristic). This operand can be used to count unstable swings and take certain action only afterpre-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 settingapplies 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 theleft and right blinders.842735A1.CDRRFWD RCAXINNER LFT BLDMIDDLE LFT BLDOUTER LFT BLDINNER RGT BLDMIDDLE RGT BLDOUTER RGT BLDREV REACHQUAD REV REACH MIDQUAD REV REACH OUTFWD REACHQUAD FWD REACH MIDQUAD FWD REACH OUT
