GE Multilin g60, Instruction Manual

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5-164 G60 Generator Protection System GE Multilin
5.6 GROUPED ELEMENTS 5 SETTINGS
5
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.
Figure 5–69: APPLICATIONS OF THE
PH DIST XFMR VOL/CUR CONNECTION
SETTINGS
• PHS DIST Z1 REACH: This setting defines the zone reach for the forward and reverse applications. In the non-direc-
tional applications, this setting defines the forward reach of the zone. The reverse reach impedance in non-directional
applications is set independently. The reach impedance is entered in secondary ohms. The reach impedance angle is
entered as the
PHS DIST Z1 RCA
setting.
To achieve specified operating speed of distance elements, the relay internally calculates source to line impedance
ratio (SIR) from fault phasors. In these calculations, line impedance is estimated based on the zone 1 reach setting.
Therefore, in order to calculate the SIR value properly and to maintain the optimal operating speed of the distance ele-
ments, you need to set zone 1 reach with a regular 80 to 85% of the line impedance reach setting, even when zone 1
is disabled.
• PHS DIST Z1 RCA: This setting specifies the characteristic angle (similar to the ‘maximum torque angle’ in previous
technologies) of the phase distance characteristic for the forward and reverse applications. In the non-directional appli-
cations, this setting defines the angle of the forward reach impedance. The reverse reach impedance in the non-direc-
tional applications is set independently. The setting is an angle of reach impedance as shown in the distance
characteristic figures shown earlier. This setting is independent from
PHS DIST Z1 DIR RCA
, the characteristic angle of an
extra directional supervising function.
830717A1.CDR
Z1
Z3
Z 3 X F RM V OL CO NNE CT I O N = N one
Z 3 X F RM CUR CO NNE CT I O N = N one
Z 1 X F RM V OL CO NNE CT I O N = Dy11
Z 1 X F RM CUR CO NNE CT I O N = Dy11
de l ta wy e , 330
o
l ag
(a)
Z1
Z3
Z 3 X F RM V OL CO NNE CT I O N = Yd1
Z 3 X F RM CUR CO NNE CT I O N = N one
Z 1 X F RM V OL CO NNE CT I O N = N one
Z 1 X F RM CUR CO NNE CT I O N = Dy11
de l ta wy e , 330
o
l ag
( b )
Z1
Z3
Z 3 X F RM V OL CO NNE CT I O N = N one
Z 3 X F RM CUR CO NNE CT I O N = Yd1
Z 1 X F RM V OL CO NNE CT I O N = Dy11
Z 1 X F RM CUR CO NNE CT I O N = N one
de l ta wy e , 330
o
l ag
( c )
Z one 1
Z one 3
(e)
L
1
L
2
Z
L 1
Z
T
Z
L 2