GE UR Series Instruction Manual page 173
Line differential relay
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5 SETTINGS
c) PHASE DIRECTIONAL 1(2) (PHASE DIRECTIONAL OVERCURRENT: ANSI 67P)
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PATH: SETTINGS
GROUPED ELEMENTS
„
PHASE
„
DIRECTIONAL 1
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
The phase directional elements (one for each of phases A, B, and C) determine the phase current flow direction for steady
state and fault conditions and can be used to control the operation of the phase overcurrent elements via the BLOCK inputs
of these elements.
Phasors for Phase A Polarization:
VPol = VBC
IA = operating current
ECA = Element Characteristic Angle at 30°
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.
GE Power Management
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SETTING GROUP 1(8)
PHASE DIR 1
FUNCTION: Disabled
PHASE DIR 1 SIGNAL
SOURCE: SRC 1
PHASE DIR 1 BLOCK:
Off
PHASE DIR 1
ECA: 30
PHASE DIR
POL V1
THRESHOLD:0.050 pu
PHASE DIR 1 BLOCK
WHEN V MEM EXP: No
PHASE DIR 1
TARGET: Self-reset
PHASE DIR 1
EVENTS: Disabled
VAG (Unfaulted)
VAG(Faulted)
VBC
VCG
×
(1/_ECA) = polarizing voltage
Figure 5–40: PHASE A DIRECTIONAL POLARIZATION
L90 Line Differential Relay
5.5 GROUPED ELEMENTS
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PHASE CURRENT
PHASE DIRECTIONAL 1
Range: Disabled, Enabled
Range: SRC 1, SRC 2,..., SRC 6
Range: FlexLogic™ operand
Range: 0 to 359° in steps of 1
Range: 0.000 to 3.000 pu in steps of 0.001
Range: No, Yes
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
–90°
Fault angle
set at 60° Lag
VPol
IA
ECA
set at 30°
VBC
VBG
827800A2.CDR
+90°
5-89
5
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