GE L60 Instruction Manual page 216

5.5 GROUPED ELEMENTS
e) PHASE DIRECTIONAL OVERCURRENT (ANSI 51P)
PATH: SETTINGS GROUPED ELEMENTS
PHASE
DIRECTIONAL 1
The phase directional elements (one for each of phases A, B, and C) determine the phase current flow direction for steady
5
state and fault conditions and can be used to control the operation of the phase overcurrent elements via the
of these elements.
This element is intended to apply a block signal to an overcurrent element to prevent an operation when current is flowing
in a particular direction. The direction of current flow is determined by measuring the phase angle between the current from
the phase CTs and the line-line voltage from the VTs, based on the 90° or 'quadrature' connection. If there is a requirement
to supervise overcurrent elements for flows in opposite directions, such as can happen through a bus-tie breaker, two
phase directional elements should be programmed with opposite ECA settings.
5-124
SETTING GROUP 1(6)
PHASE DIR 1
FUNCTION: Disabled
PHASE DIR 1 SIGNAL
MESSAGE
SOURCE: SRC 1
PHASE DIR 1 BLOCK:
MESSAGE
Off
PHASE DIR 1
MESSAGE
ECA: 30
PHASE DIR
MESSAGE
THRESHOLD: 0.700 pu
PHASE DIR 1 BLOCK
MESSAGE
WHEN V MEM EXP: No
PHASE DIR 1
MESSAGE
TARGET: Self-reset
PHASE DIR 1
MESSAGE
EVENTS: Disabled
VCG
Phasors for Phase A Polarization:
×
VPol = VBC (1/_ECA) = polarizing voltage
IA = operating current
ECA = Element Characteristic Angle at 30°
Figure 5–70: PHASE A DIRECTIONAL POLARIZATION
L60 Line Phase Comparison Relay
PHASE CURRENT
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: FlexLogic™ operand
Range: 0 to 359° in steps of 1
Range: 0.000 to 3.000 pu in steps of 0.001
POL V1
Range: No, Yes
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
–90°
VAG (Unfaulted)
Fault angle
set at 60° Lag
VAG(Faulted)
IA
ECA
set at 30°
VBC
VBG
5 SETTINGS
PHASE DIRECTIONAL 1(2)
BLOCK
VPol
VBC
+90°
827800A2.CDR
GE Multilin
inputs