GE G60 Instruction Manual page 156

5.5 GROUPED ELEMENTS
5
• PHS DIST Z1 XFMR VOL CONNECTION: The phase distance elements can be applied to look through a three-phase
delta-wye or wye-delta power transformer. In addition, VTs and CTs could be located independently from one another
at different windings of the transformer. If the potential source is located at the correct side of the transformer, this set-
ting shall be set to "None".
This setting specifies the location of the voltage source with respect to the involved power transformer in the direction
of the zone. The following figure illustrates the usage of this setting. In section (a), Zone 1 is looking through a trans-
former from the delta into the wye winding. Therefore, the Z1 setting shall be set to "Dy11". In section (b), Zone 3 is
looking through a transformer from the wye into the delta winding. Therefore, the Z3 setting shall be set to "Yd1". The
zone is restricted by the potential point (location of the VTs) as illustrated in Figure (e).
• PHS DIST Z1 XFMR CUR CONNECTION: This setting specifies the location of the current source with respect to the
involved power transformer in the direction of the zone. In section (a) of the following figure, Zone 1 is looking through
a transformer from the delta into the wye winding. Therefore, the Z1 setting shall be set to "Dy11". In section (b), the
CTs are located at the same side as the read point. Therefore, the Z3 setting shall be set to "None".
See Chapter 8: Theory of Operation for more details, and Chapter 9: Application of Settings for information on how to
calculate distance reach settings in applications involving power transformers.
5-74
X
RCA = 80
COMP LIMIT = 90
DIR RCA = 80
DIR COMP LIMIT = 90
X
RCA = 90
COMP LIMIT = 90
DIR RCA = 45
DIR COMP LIMIT = 90
Figure 5–39: MHO DISTANCE CHARACTERISTIC SAMPLE SHAPES
G60 Generator Management Relay
X
o
o
o
o
R
X
o
o
o
o
R
5 SETTINGS
RCA = 80 o
o
COMP LIMIT = 90
o
DIR RCA = 80
o
DIR COMP LIMIT = 60
R
RCA = 80 o
COMP LIMIT = 60 o
o
DIR RCA = 80
o
DIR COMP LIMIT = 60
R
837722A1.CDR
GE Multilin