Sensitive Directional Power - GE L90 Instruction Manual
Line current differential system
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CHAPTER 5: SETTINGS
5.7.16 Sensitive directional power
SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) POWER SENSITIVE DIRECTIONAL POWER
DIRECTIONAL POWER 1(2)
DIRECTIONAL
POWER 1
The sensitive directional power element responds to three-phase directional power and is designed for reverse power and
low forward power applications for synchronous machines or interconnections involving co-generation. The relay
measures the three-phase power from either a full set of wye-connected VTs or a full set of delta-connected VTs. In the
latter case, the two-wattmeter method is used. See the UR-series Metering Conventions section in chapter 6 for details
regarding 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 Power
Characteristic diagram that follows. The element responds to the following condition:
where
P and Q are active and reactive powers as measured per the UR metering convention
θ is a sum of the element characteristic (
SMIN is the minimum operating power
The operating quantity is displayed in the
The element has two independent (as to the pickup and delay settings) stages for alarm and trip, respectively.
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
DIR POWER 1
FUNCTION: Disabled
DIR POWER 1
SOURCE: SRC 1
DIR POWER 1
RCA: 0°
DIR POWER 1
CALIBRATION: 0.00°
DIR POWER 1 STG1
SMIN: 0.100 pu
DIR POWER 1 STG1
DELAY: 0.50 s
DIR POWER 1 STG2
SMIN: 0.100 pu
DIR POWER 1 STG2
DELAY: 20.00 s
DIR POWER 1 BLK:
Off
DIR POWER 1
TARGET: Self-reset
DIR POWER 1
EVENTS: Disabled
P cos θ + Q sin θ > SMIN
) and calibration (
DIR POWER 1 RCA
ACTUAL VALUES METERING SENSITIVE DIRECTIONAL POWER 1(2)
GROUPED ELEMENTS
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: 0 to 359° in steps of 1
Range: 0 to 0.95° in steps of 0.05
Range: –1.200 to 1.200 pu in steps of 0.001
Range: 0.00 to 600.00 s in steps of 0.01
Range: –1.200 to 1.200 pu in steps of 0.001
Range: 0.00 to 600.00 s in steps of 0.01
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
) angles
DIR POWER 1 CALIBRATION
5
Eq. 5-42
actual value.
5-321
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