5-300 L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUALGROUPED ELEMENTS CHAPTER 5: SETTINGS55.7.16 Sensitive directional powerSETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) POWER SENSITIVE DIRECTIONAL POWER DIRECTIONAL POWER 1(2)The sensitive directional power element responds to three-phase directional power and is designed for reverse power andlow forward power applications for synchronous machines or interconnections involving co-generation. The relaymeasures the three-phase power from either a full set of wye-connected VTs or a full set of delta-connected VTs. In thelatter case, the two-wattmeter method is used. See the UR-series Metering Conventions section in chapter 6 for detailsregarding the active and reactive powers used by the sensitive directional power element.The element has an adjustable characteristic angle and minimum operating power as shown in the Directional PowerCharacteristic diagram that follows. The element responds to the following condition:P cos θ + Q sin θ > SMIN Eq. 5-42whereP and Q are active and reactive powers as measured per the UR metering conventionθ is a sum of the element characteristic (DIR POWER 1 RCA) and calibration (DIR POWER 1 CALIBRATION) anglesSMIN is the minimum operating powerThe operating quantity is displayed in the ACTUAL VALUES METERING SENSITIVE DIRECTIONAL POWER 1(2) actual value.The element has two independent (as to the pickup and delay settings) stages for alarm and trip, respectively. DIRECTIONAL POWER 1 DIR POWER 1FUNCTION: DisabledRange: Disabled, Enabled DIR POWER 1SOURCE: SRC 1Range: SRC 1, SRC 2, SRC 3, SRC 4 DIR POWER 1RCA: 0°Range: 0 to 359° in steps of 1 DIR POWER 1CALIBRATION: 0.00°Range: 0 to 0.95° in steps of 0.05 DIR POWER 1 STG1SMIN: 0.100 puRange: –1.200 to 1.200 pu in steps of 0.001 DIR POWER 1 STG1DELAY: 0.50 sRange: 0.00 to 600.00 s in steps of 0.01 DIR POWER 1 STG2SMIN: 0.100 puRange: –1.200 to 1.200 pu in steps of 0.001 DIR POWER 1 STG2DELAY: 20.00 sRange: 0.00 to 600.00 s in steps of 0.01 DIR POWER 1 BLK:OffRange: FlexLogic operand DIR POWER 1TARGET: Self-resetRange: Self-reset, Latched, Disabled DIR POWER 1EVENTS: DisabledRange: Disabled, Enabled
