Directional Mho Distance Characteristic - GE T60 Instruction Manual

5.6 GROUPED ELEMENTS
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 [
time-delayed elements (operate [
tripping mode.
5
• 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-
ward reach impedance defined by the
ance defined by
• PHS DIST Z1 SHAPE: This setting selects the shape of the phase distance function between the mho and quadrilat-
eral characteristics. The selection is available on a per-zone basis. The two characteristics and their possible varia-
tions are shown in the following figures.
5-184
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-reaching
OP
Ensure that the Phase VT Secondary Voltage setting (see the
 menu) is set correctly to prevent improper operation of associated mem-
INPUTS VOLTAGE BANK
ory action.
PHS DIST Z1 REACH
and
PHS DIST Z1 REV REACH PHS DIST Z1 REV REACH RCA
DIR COMP LIMIT
Figure 5–71: DIRECTIONAL MHO DISTANCE CHARACTERISTIC
T60 Transformer Protection System
).
DISTANCE
] and dropout [
PKP
and
PHS DIST Z1 RCA
as illustrated below.
X
COMP LIMIT
DIR COMP LIMIT
DIR RCA
RCA
837720A1.CDR
5 SETTINGS
SETTINGS
] FlexLogic operands) or
DPO

SETTINGS SYSTEM SETUP
PHS DIST Z1 RCA
settings, and the reverse reach imped-
R


AC
GE Multilin