GE G60 Instruction Manual page 403
Ur series generator protection system
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- Instruction manual (768 pages) ,
- Communications manual (532 pages) ,
- Instruction manual (430 pages)
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5 SETTINGS
(
)E
(
1 k
–
+
3
------------------------------------------------------------------------------------ -
V
=
0
V
V
10 pu
+
=
N
0
Therefore, for faults at a fraction k = 0.15 from the neutral grounding point, we set the operating quantities as follows:
The 100% stator ground settings are described below.
•
100% STATOR GND STG1 PICKUP: This setting specifies a pickup level for the operating quantity. It may be benefi-
cial to measure the operating quantity under various load conditions for a particular machine in order to optimize this
setting. This can be achieved using the actual values menu of the G60.
•
100% STATOR GND STG1 DELAY: This setting specifies a time delay required to operate after the pickup condition is
established.
•
100% STATOR GND STG1 SUPV: This setting specifies a signal level supervision for the vectorial sum of the third
harmonic at the machine neutral and in the zero-sequence terminal voltage. The setting is entered as a per-unit value
of the terminal voltages. Different settings may be considered for stages 1 and 2 as one of them could be used for
alarm and the other for trip. The safe value of this setting could be established after putting a given machine into ser-
vice and reading the quantity from the relay under
GE Multilin
)E
(
)E
1 k
1 k
×
–
+
–
3 0.85
3
3
--------------------------------- -
=
3
3
V
N
>
---------------------- -
Pickup
=
V
V
+
N
0
Supervision
<
V
+
N
ACTUAL VALUES
Figure 5–129: 100% STATOR GROUND SCHEME LOGIC
G60 Generator Protection System
×
10
8.5
V
V
8.5
=
+
=
N
0
1.5
------- -
0.15 pu
=
10
V
10 pu
=
0
menu.
5.6 GROUPED ELEMENTS
1.5
10
+
=
(EQ 5.40)
(EQ 5.41)
5-243
5
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