5-56
G650 Generator Protection & Control System
GEK-113285A
5.4 PROTECTION ELEMENTS
5 SETTINGS
5
5.4.6 RESTRICTED GROUND FAULT (ONLY FOR ENHANCED MODELS)
G650 provides the possibility of having a RGF (Restricted Ground Fault) function, only available for Enhanced models
(please see ordering code). This RGF function is based in the comparison of the neutral current calculated from phase
currents with ground current measured from the fourth current input (B9-B10). The implementation is a low impedance
current differential scheme. G650 calculates the vectorial difference of the residual and ground currents (3I
0
-I
g
) and divides
this by the maximum line current (I
max
) to produce a percent slope value.
Figure 5–9: RESTRICTED GROUND FAULT IMPLEMENTATION
The RGF settings are shown on the table below:
Table 5–54: .RESTRICTED GROUND FAULT SETTINGS
•
Restricted Ground Fault Function
: This setting allows enabling or disabling the restricted ground fault element.
•
Restricted Ground Fault Pickup
: This setting defines the minimum differential current required for operation in units
of Phase CT Ratio.
•
Restricted Ground Fault Slope
: This setting defines the restraint during normal operation conditions to assure
sensitivity to internal faults. Slope percentage of ground differential current to maximum line current.
•
Restricted Ground Fault Delay
: Time that the element must remain picked up before the element operates.
SETPOINT > PROTECTION ELEMENTS > GROUND CURRENT > RESTRICTED GND FAULT >
RESTRICTED GND FAULT 1> RESTRICTED GND FAULT 2 > RESTRICTED GND FAULT 3
Setting Description
Name
Default
Step
Range
Restricted Ground Fault Function
Permission
Function
Disabled
N/A
Disabled - Enabled
Restricted Ground Fault Pickup
Ground Fault Pickup
10.00
0.01 CT
0.02 - 20.00 CT
Restricted Ground Fault Slope
Ground Fault Slope
10.00
0.01%
0.00 - 100.00%
Restricted Ground Fault Delay
Ground Fault Delay
0.10 s
0.01
0.00 - 600.00 s
Snapshot Event Generation
Snapshot Events
Enabled
N/A
Disabled - Enabled
Содержание Multilin G650
Страница 9: ...8 G650 Generator Protection Control System GEK 113285A TABLE OF CONTENTS ...
Страница 29: ...1 20 G650 Generator Protection Control System GEK 113285A 1 4 650 HARDWARE 1 GETTING STARTED 1 ...
Страница 293: ...5 150 G650 Generator Protection Control System GEK 113285A 5 9 LOGIC CONFIGURATION PLC EDITOR 5 SETTINGS 5 ...
Страница 391: ...11 6 G650 Generator Protection Control System GEK 113285A 11 4 RELAY CONFIGURATION 11 FREQUENTLY ASKED QUESTIONS 11 ...
Страница 426: ...GEK 113285A G650 Generator Protection Control System A 31 APPENDIX A A 1 LOGIC OPERANDS A ...
Страница 427: ...A 32 G650 Generator Protection Control System GEK 113285A A 1 LOGIC OPERANDS APPENDIXA A ...
Страница 587: ...C 22 G650 Generator Protection Control System GEK 113285A C 8 ANALOG INPUTS APPENDIXC C ...
Страница 595: ...D 8 G650 Generator Protection Control System GEK 113285A D 5 IEC 60870 5 104 POINT LIST APPENDIXD D ...
Страница 606: ...GEK 113285A G650 Generator Protection Control System E 11 APPENDIX E E 1 FACTORY DEFAULT LOGIC E ...
Страница 607: ...E 12 G650 Generator Protection Control System GEK 113285A E 1 FACTORY DEFAULT LOGIC APPENDIXE E ...
Страница 639: ...G 2 G650 Generator Protection Control System GEK 113285A G 1 GE MULTILIN WARRANTY APPENDIXG G ...