GE L90 Instruction Manual page 284

5.6 GROUPED ELEMENTS
5
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 is comprised of a reactance characteristic, right and left blinders, and 100%
memory-polarized directional and current supervising characteristics. When set to "Non-directional", the quadrilateral func-
tion applies a reactance line in the reverse direction instead of the directional comparators. Refer to Chapter 8 for additional
information.
Each phase distance zone is configured individually through its own setting menu. All of the settings can be independently
modified for each of the zones except:
1. The
SIGNAL SOURCE
ELEMENTS SETTING GROUP 1(6)
2. The
MEMORY DURATION
GROUPED ELEMENTS
The common distance settings described earlier must be properly chosen for correct operation of the phase distance ele-
ments. Additional details may be found in chapter 8: Theory of operation.
Although all zones can be used as either instantaneous elements (pickup [
or time-delayed elements (operate [
ing tripping mode.
• PHS DIST Z1 DIR: All phase distance zones are reversible. The forward direction is defined by the
setting, whereas the reverse direction is shifted 180° from that angle. The non-directional zone spans between the for-
5-138
PHS DIST Z1
MESSAGE
DIR COMP LIMIT: 90°
PHS DIST Z1 QUAD
MESSAGE
RGT BLD: 10.00 ohms
PHS DIST Z1 QUAD
MESSAGE
RGT BLD RCA: 85°
PHS DIST Z1 QUAD
MESSAGE
LFT BLD: 10.00 ohms
PHS DIST Z1 QUAD
MESSAGE
LFT BLD RCA: 85°
PHS DIST Z1
MESSAGE
SUPV: 0.200 pu
PHS DIST Z1 VOLT
MESSAGE
LEVEL: 0.000 pu
PHS DIST Z1
MESSAGE
DELAY: 0.000 s
PHS DIST Z1 BLK:
MESSAGE
Off
PHS DIST Z1
MESSAGE
TARGET: Self-reset
PHS DIST Z1
MESSAGE
EVENTS: Disabled
setting (common for the distance elements of all zones as entered under
DISTANCE
setting (common for the distance elements of all zones as entered under
SETTING GROUP 1(6)
] FlexLogic™ operands), only zone 1 is intended for the instantaneous under-reach-
OP
Ensure that the Phase VT Secondary Voltage setting (see the SETTINGS ðò SYSTEM SETUP ð AC
INPUTS ðò VOLTAGE BANK menu) is set correctly to prevent improper operation of associated
memory action.
L90 Line Current Differential System
Range: 30 to 90° in steps of 1
Range: 0.02 to 500.00 ohms in steps of 0.01
Range: 60 to 90° in steps of 1
Range: 0.02 to 500.00 ohms in steps of 0.01
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
).
).
DISTANCE
] and dropout [
PKP
5 SETTINGS
SETTINGS GROUPED
SETTINGS
] FlexLogic™ operands)
DPO
PHS DIST Z1 RCA
GE Multilin