5-52
G650 Generator Protection & Control System
GEK-113285A
5.4 PROTECTION ELEMENTS
5 SETTINGS
5
Table 5–47: QUANTITIES
5.4.5 GROUND CURRENT
The Ground Current menu incorporates the following overcurrent elements:
Ground time overcurrent (51G)
Ground instantaneous overcurrent (50G)
Ground directional element (67G)
Restricted Ground Fault (87G). Enhanced models only.
5.4.5.1 GROUND TIME DELAYED OVERCURRENT ELEMENT (51G)
Ground TOC is a ground time delayed overcurrent protection element. The ground current is measured from the ground
input, terminals B9-B10, and it may be programmed as Fundamental phasor magnitude or RMS magnitude as required by
the application. The element trip can be time delayed using a selectable curve. It incorporates a reset time that is selectable
between instantaneous or linear.
Table 5–48: 51G ELEMENT SETTINGS
The snapshot event setting enables or disables the snapshot event generation for this element.
POLARIZING MODE
DIRECTION
COMPARED PHASORS
VOLTAGE (Vo)
FORWARD
-Vo
Io x 1 MTA
REVERSE
-Vo
-Io x 1 MTA
CURRENT (Ip)
FORWARD
Isg
Io
REVERSE
Isg
-Io
Vo + Ip
FORWARD
- Vo
Io
or
Isg
Io
REVERSE
- Vo
-Io
or
Isg
-Io
Vo * Ip
FORWARD
- Vo
Io
and
Isg
Io
REVERSE
- Vo
-Io
and
Isg
-Io
SETPOINT > PROTECTION ELEMENTS > GROUND CURRENT > GROUND TOC
GROUND TOC 1> GROUND TOC 2 > GROUND TOC 3
SETTING DESCRIPTION
NAME
DEFAULT VALUE
STEP
RANGE
Function permission
Function
DISABLED
N/A
[DISABLED – ENABLED]
Input type
Input
PHASOR(DFT)
N/A
[PHASOR – RMS]
Pickup level
Pickup Level
1.00
0.01 A
[0.05 : 160.00]
Curve shape
Curve
IEEE Ext Inv
N/A
[See list of curves]
Time Dial
TD Multiplier
1.00
0.01 s
[0.00 : 900.00]
Reset type
Reset
INSTANTANEOUS N/A
[INSTANTANEOUS – LINEAR]
Snapshot Event generation
Snapshot Events
ENABLED
N/A
[DISABLED – ENABLED]
Summary of Contents for Multilin G650
Page 9: ...8 G650 Generator Protection Control System GEK 113285A TABLE OF CONTENTS ...
Page 426: ...GEK 113285A G650 Generator Protection Control System A 31 APPENDIX A A 1 LOGIC OPERANDS A ...
Page 427: ...A 32 G650 Generator Protection Control System GEK 113285A A 1 LOGIC OPERANDS APPENDIXA A ...
Page 587: ...C 22 G650 Generator Protection Control System GEK 113285A C 8 ANALOG INPUTS APPENDIXC C ...
Page 639: ...G 2 G650 Generator Protection Control System GEK 113285A G 1 GE MULTILIN WARRANTY APPENDIXG G ...