GE D30 Instruction Manual page 404

GROUPED ELEMENTS
The phase mho distance function uses a dynamic 100% memory-polarized mho characteristic with additional reactance,
directional, and overcurrent supervising characteristics. When set to "Non-directional," the mho function becomes an
offset mho with the reverse reach controlled independently from the forward reach, and all the directional characteristics
removed.
The phase quadrilateral distance function has a reactance characteristic, right and left blinders, and 100% memory-
polarized directional and current supervising characteristics. When set to "Non-directional," the quadrilateral function
applies a reactance line in the reverse direction instead of the directional comparators.
Each phase distance zone is configured individually through its own setting menu. All of the settings can be independently
5
modified for each of the zones except:
• The
SIGNAL SOURCE
ELEMENTS  SETTING GROUP 1(6)  DISTANCE
• The
MEMORY DURATION
GROUPED ELEMENTS  SETTING GROUP 1(6)  DISTANCE
The common distance settings described earlier must be chosen properly for correct operation of the phase distance
elements.
Although all zones can be used as either instantaneous elements (pickup [
time-delayed elements (operate [
tripping mode.
— All phase distance zones are reversible. The forward direction is defined by the
PHS DIST Z1 DIR
whereas the reverse direction is shifted 180° from that angle. The non-directional zone spans between the forward reach
impedance defined by the
PHS DIST Z1 REV REACH
PHS DIST Z1 SHAPE
characteristics. The selection is available on a per-zone basis. The two characteristics and their possible variations are
shown in the following figures.
5-194
PHS DIST Z1 QUAD

LFT BLD RCA: 85°
PHS DIST Z1

SUPV: 0.200 pu
PHS DIST Z1 VOLT

LEVEL: 0.000 pu
PHS DIST Z1

DELAY: 0.000 s
PHS DIST Z1 BLK:

Off
PHS DIST Z1

TARGET: Self-reset
PHS DIST Z1

EVENTS: Disabled
setting (common for the distance elements of all zones as entered under
setting (common for the distance elements of all zones as entered under
] FlexLogic operands), only zone 1 is intended for the instantaneous under-reaching
OP
Ensure that the Phase VT Secondary Voltage setting (see the
menu) is set correctly to prevent improper operation of associated memory
 VOLTAGE BANK
action.
and
PHS DIST Z1 REACH
and
PHS DIST Z1 REV REACH RCA
— This setting selects the shape of the phase distance function between the mho and quadrilateral
Range: 60 to 90° in steps of 1
Range: 0.050 to 30.000 pu in steps of 0.001
Range: 0.000 to 5.000 pu in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
)
)
] and dropout [
PKP
settings, and the reverse reach impedance defined by
PHS DIST Z1 RCA
as illustrated in the following figures.
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
SETTINGS  GROUPED
SETTINGS 
] FlexLogic operands) or
DPO
SETTINGS  SYSTEM SETUP  AC INPUTS
PHS DIST Z1 RCA
setting,