5-46
G650 Generator Protection & Control System
GEK-113285A
5.4 PROTECTION ELEMENTS
5 SETTINGS
5
5.4.4 NEUTRAL CURRENT
The Neutral Current menu incorporates the following overcurrent elements:
•
Neutral time overcurrent (51N)
•
Neutral instantaneous overcurrent (50N)
•
Neutral directional element (67N)
5.4.4.1 NEUTRAL TIME DELAYED OVERCURRENT ELEMENT (51N)
Neutral TOC is a neutral time delayed overcurrent protection element. This element uses as the input quantity the
neutral
current, calculated from the phase currents
. The trip can be timed by a curve selectable by setting. The reset can be
instantaneous or linear.
Table 5–42: NEUTRAL TOC ELEMENT SETTINGS
The snapshot event setting enables or disables the snapshot event generation for this element.
5.4.4.2 NEUTRAL INSTANTANEOUS OVERCURRENT ELEMENT (50N)
This function can be used as an instantaneous element or as a definite time element. The element responds to the neutral
current, calculated from phase currents.
Table 5–43: NEUTRAL IOC ELEMENT SETTINGS
The snapshot event setting enables or disables the snapshot event generation for this element.
SETPOINT > PROTECTION ELEMENTS > NEUTRAL CURRENT > NEUTRAL TOC
NEUTRAL TOC 1> NEUTRAL TOC 2 > NEUTRAL TOC 3
SETTING DESCRIPTION
NAME
DEFAULT VALUE
STEP
RANGE
Function permission
Function
DISABLED
N/A
[DISABLED – ENABLED]
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]
SETPOINT > PROTECTION ELEMENTS > NEUTRAL CURRENT > NEUTRAL IOC
NEUTRAL IOC 1> NEUTRAL IOC 2 > NEUTRAL IOC 3
SETTING DESCRIPTION
NAME
DEFAULT
VALUE
STEP
RANGE
Function permission
Function
DISABLED
N/A
[DISABLED – ENABLED]
Pickup level
Pickup Level
30.00
0.01 A
[0.05 : 160.00]
Trip time
Trip Delay
0.00
0.01 s
[0.00 : 900.00]
Reset time
Reset Delay
0.00
0.01 s
[0.00 : 900.00]
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 ...