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10.1 SETTING EXAMPLE
For the example system, we have the following values:
The voltage supervision setting will be determined by a system study and may be disabled on either element if required. VT
fuse failure should supervise this element.
The choice of source is not critical for this application. The NEUTRL source is chosen for the following setting changes.
Make the following changes in EnerVista UR Setup or through the
1
LOSS OF EXCITATION
The reverse power element should be set at ½ the rated motoring power. The pickup is calculated as follows:
S
For the example system:
10
10-4
2
base kV
CT ratio
×
-------------------------- -
-------------------- -
Z
=
(
)
b sec
base MVA
VT ratio
'(sec)
' Z
×
X
=
X
d
d
b
(
)
×
(
X
sec
X
Z
sec
=
d
d
b
(
)
Z
sec
+
b
CENTER 1
=
------------------------------------------------ -
2
Z
RADIUS 1
=
--------------------
PICKUP DELAY 1
(
)
X
sec
+
X
d
CENTER 2
=
-------------------------------------------------
2
X
d
RADIUS 2
=
-------------------- -
menu:
1
Rated Motoring Power (primary watts)
×
-- -
------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -
=
×
min
2
3
Phase CT Primary Phase VT Ratio Phase VT Secondary
×
1
22
×
S
-- -
-------------------------------------------------------------------- -
=
×
min
2
3
8000 A 157.5
G60 Generator Protection System
2
(
)
18 kV
1600
×
----------------------------------- -
-------------- -
=
211.765 MVA
157.5
0.216 15.54 Ω
×
3.36 Ω
(sec)
=
=
)
×
15.54 Ω
30.57 Ω
1.967
=
=
'(sec)
X
15.54Ω
+
3.36Ω
d
=
------------------------------------------ -
2
(
)
15.54 Ω
sec
b
7.77 Ω
=
--------------------- -
=
2
2
=
0.06 seconds
'(sec)
30.57Ω
3.36Ω
+
d
=
------------------------------------------ -
2
(
)
sec
30.57 Ω
15.28 Ω
=
--------------------- -
=
2
2
SETTINGS
×
×
6
10
W
0.044 pu
=
×
×
66 V
10 APPLICATION OF SETTINGS
10.1.7 LOSS OF EXCITATION
15.54 Ω
=
9.45 Ω
=
16.97 Ω
=
GROUPED ELEMENTS
SETTING GROUP
10.1.8 REVERSE POWER
(EQ 10.7)
(EQ 10.8)
(EQ 10.9)
(EQ 10.10)
(EQ 10.11)
(EQ 10.12)
(EQ 10.13)
(EQ 10.14)
(EQ 10.15)
GE Multilin
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