5-60
G650 Generator Protection & Control System
GEK-113285A
5.4 PROTECTION ELEMENTS
5 SETTINGS
5
5.4.8 NEGATIVE SEQUENCE CURRENT
The Negative sequence menu incorporates the following elements:
•
Negative sequence time overcurrent (51-2)
•
Negative sequence instantaneous overcurrent (50-2)
•
Generator unbalance (46)
5.4.8.1 NEGATIVE SEQUENCE OVERCURRENT ELEMENT (51-2)
Negative Sequence TOC is an overcurrent protection element that uses the fundamental phasor of the negative sequence
current as input magnitude, calculated from the phase currents. This element can be used for detecting load unbalance in
the system, and for open phase conditions (fallen or broken conductor). The trip can be time delayed by a curve selectable
by setting. The reset can be instantaneous or linear.
Table 5–61: NEGATIVE SEQUENCE TOC ELEMENT SETTINGS
The snapshot event setting enables or disables the snapshot event generation for this element.
5.4.8.2 NEGATIVE SEQUENCE INSTANTANEOUS OVERCURRENT ELEMENT (50-2)
Negative Sequence IOC is an overcurrent protection element that uses the fundamental phasor of the negative sequence
current as input magnitude, calculated from the phase currents. This element can be used for detecting load unbalance in
the system, and for open phase conditions (fallen or broken conductor). The trip time can be selected as instantaneous
or
timed, with the timer selectable between 0.00 and 900 seconds. The element incorporates a reset time selectable between
0 and 900 seconds.
Table 5–62: NEGATIVE SEQUENCE IOC ELEMENT SETTINGS
The snapshot event setting enables or disables the snapshot event generation for this element.
SETPOINT > PROTECTION ELEMENTS > NEGATIVE SEQUENCE CURRENT > NEGATIVE SEQUENCE TOC >
NEGATIVE SEQUENCE TOC 1> NEGATIVE SEQUENCE TOC 2 > NEGATIVE SEQUENCE 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 > NEGATIVE SEQUENCE CURRENT > NEGATIVE SEQUENCE IOC >
NEGATIVE SEQUENCE IOC 1> NEGATIVE SEQUENCE IOC 2 > NEGATIVE SEQUENCE 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 s
0.01 s
[0.00 : 900.00]
Reset time
Reset delay
0.00 s
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 ...