5-48
G650 Generator Protection & Control System
GEK-113285A
5.4 PROTECTION ELEMENTS
5 SETTINGS
5
5.4.4.3 NEUTRAL DIRECTIONAL ELEMENT (67N)
The Neutral directional element is used for supervising the neutral (3I0) overcurrent elements. This element can be set to
use either the neutral voltage, or the polarization current measured by the 5
th
current input (Ip), or both as polarization
magnitude.
Table 5–44: 67N ELEMENT SETTINGS
Settings for this element are:
Maximum Torque Angle (MTA)
:
Angle used to rotate the polarization voltage. Positive angles are counter clockwise
rotations, and negative angles are clockwise rotations. The polarization magnitude,
once rotated, defines the MTA line. Vn rotated by this angle points to the semi plane
that corresponds to a Reverse fault. -Vn rotated this angle points to the semi plane
that corresponds to a Forward fault. A typical setting can be –45º.
Directional element direction (Direction)
: This setting indicates the Direction for which the element will allow a trip.
Depending on this setting, the element will be activated for faults in the forward
direction, or ion the reverse direction, allowing its use in tripping or blocking
schemes. Possible options for this setting are FORWARD and REVERSE.
Polarization type (Polarization)
:
This setting indicates the type of Polarization to be used. The relay can use voltage
polarization (V0), and/or current polarization (Ip). Possible setting values are:
V0
Voltage polarization
Ip
Current polarization
V0 + Ip
Voltage or current polarization. This allows the element to
operate when any of the polarization magnitudes allow operation.
V0 * Ip
Voltage and current polarization. This allows the element to
operate when both polarization magnitudes allow operation.
If the selected polarization type is V0+Ip, then the relay will operate when any of the
polarization magnitudes indicate the selected direction in the Direction setting.
If the selected polarization type is V0*Ip, then the relay will only operate when both
polarization magnitudes indicate the selected direction in the Direction setting.
Polarization Voltage Threshold
This is the minimum voltage considered for the direction calculation. Under this
setting, the element will be blocked.
Snapshot Events:
The snapshot event setting enables or disables the snapshot event generation for
this elements.
SETPOINT > PROTECTION ELEMENTS > NEUTRAL CURRENT > NEUTRAL DIRECTIONAL >
NEUTRAL DIRECTIONAL 1> NEUTRAL DIRECTIONAL 2 > NEUTRAL DIRECTIONAL 3
SETTING DESCRIPTION
NAME
DEFAULT VALUE STEP
RANGE
Function permission
Function
DISABLED
N/A
[DISABLED – ENABLED]
Maximum Torque Angle
MTA
-45
1 Deg
[-90 : +90]
Operation Direction
Direction
FORWARD
N/A
[FORWARD – REVERSE]
Polarization type
Polarization
VO
N/A
[V
0
– I
P
– V
0
+I
P
– V
0
*I
P
]
Block logic type
Block Logic
PERMISSION
N/A
[BLOCK – PERMISSION]
Polarization voltage threshold
Pol V Threshold
0
1 V
[0 : 00]
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 ...