GE T60, Instruction Manual

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GE Multilin T60 Transformer Protection System 5-187
5 SETTINGS 5.6 GROUPED ELEMENTS
5
Figure 5–75: QUADRILATERAL DISTANCE CHARACTERISTIC SAMPLE SHAPES
• 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 the Theory of operation chapter for more details, and the Application of settings chapter for information on calcu-
lating distance reach settings in applications involving power transformers.
837723A1.CDR
X
R
R
EAC
H
RCA = 80
o
COMP LIMIT = 90
o
DIR RCA = 80 o
DIR COMP LIMIT = 90 o
RGT BLD RCA = 80 o
LFT BLD RCA = 80 o
X
R
X
R
X
R
R
EAC
H
RCA = 80
o
COMP LIMIT = 90
o
DIR RCA = 80 o
DIR COMP LIMIT = 60 o
RGT BLD RCA = 80 o
LFT BLD RCA = 80 o
R
EAC
H
RCA = 90
o
COMP LIMIT = 90
o
DIR RCA = 45
o
DIR COMP LIMIT = 90
o
RGT BLD RCA = 90
o
LFT BLD RCA = 90
o
R
EAC
H
RCA = 80
o
COMP LIMIT = 80
o
DIR RCA = 45
o
DIR COMP LIMIT = 60
o
RGT BLD RCA = 80
o
LFT BLD RCA = 80
o