GE L90 User Manual

CHAPTER 5: SETTINGS GROUPED ELEMENTS
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-321
5
5.7.16 Sensitive directional power
SETTINGS  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 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:
P cos θ + Q sin θ > SMIN Eq. 5-42
where
P and Q are active and reactive powers as measured per the UR metering convention
θ is a sum of the element characteristic (
DIR POWER 1 RCA) and calibration (DIR POWER 1 CALIBRATION) angles
SMIN is the minimum operating power
The 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 1
FUNCTION: Disabled
Range: Disabled, Enabled

DIR POWER 1
SOURCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4

DIR POWER 1
RCA: 0°
Range: 0 to 359° in steps of 1

DIR POWER 1
CALIBRATION: 0.00°
Range: 0 to 0.95° in steps of 0.05

DIR POWER 1 STG1
SMIN: 0.100 pu
Range: –1.200 to 1.200 pu in steps of 0.001

DIR POWER 1 STG1
DELAY: 0.50 s
Range: 0.00 to 600.00 s in steps of 0.01

DIR POWER 1 STG2
SMIN: 0.100 pu
Range: –1.200 to 1.200 pu in steps of 0.001

DIR POWER 1 STG2
DELAY: 20.00 s
Range: 0.00 to 600.00 s in steps of 0.01

DIR POWER 1 BLK:
Off
Range: FlexLogic operand

DIR POWER 1
TARGET: Self-reset
Range: Self-reset, Latched, Disabled

DIR POWER 1
EVENTS: Disabled
Range: Disabled, Enabled

GE L90 Specifications

General

Communication	Ethernet, Serial
Mounting	Panel Mount
Frequency	50/60 Hz
Inputs	Digital, Analog
Outputs	Relay
Control	Local, Remote
Communication Interface	IEC 61850, DNP3, Modbus
Protection Functions	Differential, Ground Fault
Standards Compliance	IEC, IEEE