GE G60 UR Series, Instruction Manual

Page: 259 / 634

GE Multilin G60 Generator Protection System 5-127
5 SETTINGS 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.
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
setting (common for the distance elements of all zones as entered under
SETTINGS
ÖØ
GROUPED
ELEMENTS
Ö
SETTING GROUP 1(6)
ÖØ
DISTANCE
).
2. The
MEMORY DURATION
setting (common for the distance elements of all zones as entered under
SETTINGS
ÖØ
GROUPED ELEMENTS
Ö
SETTING GROUP 1(6)
ÖØ
DISTANCE
).
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 .
Ensure that the
PHASE VT SECONDARY VOLTAGE
setting (see the
SETTINGS
ÖØ
SYSTEM SETUP
Ö
AC INPUTS
ÖØ
VOLTAGE BANK
menu) is set correctly to prevent improper operation of associated memory action.
• PHS DIST Z1 DIR: All phase distance zones are reversible. The forward direction is defined by the
PHS DIST Z1 RCA
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
PHS DIST Z1 REACH
and
PHS DIST Z1 RCA
settings, and the reverse reach imped-
ance defined by
PHS DIST Z1 REV REACH
and
PHS DIST Z1 REV REACH RCA
as illustrated below.
Figure 5–56: DIRECTIONAL MHO DISTANCE CHARACTERISTIC
MESSAGE
PHS DIST Z1 BLK:
Off
Range: FlexLogic™ operand
MESSAGE
PHS DIST Z1
TARGET: Self-reset
Range: Self-reset, Latched, Disabled
MESSAGE
PHS DIST Z1
EVENTS: Disabled
Range: Disabled, Enabled
WARNING
837720A1.CDR
X
R
R
EAC
H
RCA
DIR RCA
DIR COMP LIMIT
DIR COMP LIMIT
COMP LIMIT