GE Multilin
G60 Generator Protection System
5-243
5 SETTINGS
5.6 GROUPED ELEMENTS
5
(EQ 5.40)
Therefore, for faults at a fraction
k
= 0.15 from the neutral grounding point, we set the operating quantities as follows:
(EQ 5.41)
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
ACTUAL VALUES
menu.
Figure 5–129: 100% STATOR GROUND SCHEME LOGIC
V
0
1
k
–
(
)
E
3
1
k
–
(
)
E
3
1
k
–
(
)
E
3
+
+
3
-------------------------------------------------------------------------------------
3 0.85 10
×
×
3
----------------------------------
8.5
=
=
=
V
N
V
0
+
8.5 1.5
+
10
=
=
V
N
V
0
+
10 pu
=
Pickup
V
N
V
N
V
0
+
-----------------------
>
1.5
10
--------
0.15 pu
=
=
Supervision
V
N
V
0
+
<
10 pu
=
SETTING
SETTING
SETTING
SETTING
SETTING
SETTING
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
FLEXLOGIC OPERANDS
FLEXLOGIC OPERANDS
100% STATOR GROUND
FUNCTION:
100% STATOR GND BLK:
STATOR GROUND
SOURCE:
100% STATOR GND STG1
DELAY:
100% STATOR GND STG2
DELAY:
100% STATOR GND STG2
PICKUP:
100% STATOR GND STG1
PICKUP:
100% STATOR GND STG2
SUPV:
100% STATOR GND STG1
SUPV:
V_1 > 0.5 pu
100% STATOR PKP
100% STATOR STG2 OP
100% STATOR DPO
100% STATOR OP
100% STATOR STG1 OP
100% STATOR STG1 DPO
100% STATOR STG2 DPO
Off=0
Enabled=1
830003A6.CDR
RUN
Vaux (3rd harmonic)
V_0 (3rd harmonic)
V_1 (fundamental)
20 ms
20 ms
t
t
PKP
PKP
AND
AND
OR
OR
AND
Vaux
Vaux + V_0
Pickup
<
V_0
&
&
Vaux + V_0
1-Pickup
<
Vaux + V_0
Supv
<
100% STATOR STG2 PKP
100% STATOR STG1 PKP
Summary of Contents for Multilin g60
Page 10: ...x G60 Generator Protection System GE Multilin TABLE OF CONTENTS INDEX ...
Page 32: ...1 22 G60 Generator Protection System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Page 160: ...4 30 G60 Generator Protection System GE Multilin 4 3 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Page 486: ...5 326 G60 Generator Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 518: ...6 32 G60 Generator Protection System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Page 532: ...7 14 G60 Generator Protection System GE Multilin 7 2 TARGETS 7 COMMANDS AND TARGETS 7 ...
Page 748: ...D 10 G60 Generator Protection System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...
Page 760: ...E 12 G60 Generator Protection System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...