GE Multilin g60 Instruction Manual page 366
Ur series generator protection system
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5.6 GROUPED ELEMENTS
1 k
–
V
------------------------------------------------------------------------------------ -
=
0
V
V
+
N
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
5
SETTING
100% STATOR GROUND
FUNCTION:
Disabled=0
Enabled=1
SETTING
AND
100% STATOR GND BLK:
Off=0
SETTING
STATOR GROUND
SOURCE:
Vaux (3rd harmonic)
V_0 (3rd harmonic)
V_1 (fundamental)
5-206
E
E
E
1 k
1 k
+
–
+
–
3
3
3
=
3
10 pu
=
0
V
---------------------- -
Pickup
V
N
Supervision
SETTING
100% STATOR GND STG1
PICKUP:
100% STATOR GND STG1
SUPV:
100% STATOR GND STG2
PICKUP:
100% STATOR GND STG2
SUPV:
RUN
Vaux
<
Pickup
Vaux + V_0
&
V_0
<
1-Pickup
Vaux + V_0
&
<
Vaux + V_0
Supv
V_1 > 0.5 pu
Figure 5–113: 100% STATOR GROUND SCHEME LOGIC
G60 Generator Protection System
3 0.85
10
--------------------------------- -
8.5
V
=
+
N
3
1.5
N
------- -
0.15 pu
=
=
V
10
+
0
V
V
10 pu
+
=
N
0
menu.
ACTUAL VALUES
SETTING
100% STATOR GND STG1
DELAY:
t
PKP
20 ms
FLEXLOGIC OPERANDS
100% STATOR STG1 DPO
AND
100% STATOR STG1 PKP
FLEXLOGIC OPERANDS
AND
100% STATOR STG2 PKP
100% STATOR STG2 DPO
SETTING
100% STATOR GND STG2
DELAY:
t
PKP
20 ms
5 SETTINGS
V
8.5
1.5
10
=
+
=
0
FLEXLOGIC OPERAND
100% STATOR STG1 OP
FLEXLOGIC OPERAND
100% STATOR DPO
FLEXLOGIC OPERAND
OR
100% STATOR PKP
FLEXLOGIC OPERAND
OR
100% STATOR OP
FLEXLOGIC OPERAND
100% STATOR STG2 OP
(EQ 5.40)
(EQ 5.41)
830003A5.CDR
GE Multilin
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