GEK-106310AB
F650 Digital Bay Controller
5-87
5 SETTINGS
5.5 CONTROL ELEMENTS
5
5.5.2 UNDERFREQUENCY ELEMENT (81U)
Setpoint >Control Elements > Underfrequency
The steady-state frequency of a power system is a certain indicator of the existing balance between the generated power
and the load. Whenever this balance is disrupted through the loss of an important generating unit, the effect will be a
reduction in frequency. A reliable method to quickly restore the balance between load and generation is to automatically
disconnect the selected loads, based on the actual system frequency. This technique called “load-shedding” maintains
system integrity and minimizes widespread outages.
The 81U element is an underfrequency control element. The pickup setting can be selected from 20.00 to 65.00 Hz. The
element reset time delayed is selectable between 0.00 and 900 seconds, and for the element to operate it is necessary that
the voltage value is over the value set for minimum voltage threshold. This way undesired trips are prevented when the
signal for metering the frequency is not available or has a very low value.
Table 5–74: 81U ELEMENT SETTINGS
The snapshot event setting enables or disables the snapshot event generation for this element.
Frequency elements operate with the system frequency, this frequency is measured in the voltage channel set for the
frequency reference, in the
Frequency Reference
setting inside
Setpoint > System Setup >General Settings.
SETPOINT > CONTROL ELEMENTS > UNDERFREQUENCY
UNDERFREQUENCY 1 > UNDERFREQUENCY 2 > UNDERFREQUENCY 3
SETTING DESCRIPTION
NAME
DEFAULT VALUE
STEP
RANGE
Function permission
Function
DISABLED
N/A
[DISABLED – ENABLED]
Pickup level
Pickup Level
49.50
0.01 Hz
[20.00 : 65.00]
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]
Minimum voltage threshold
Minimum Voltage
30
1 V
[10 : 300]
Snapshot event generation
Snapshot Events
ENABLED
N/A
[DISABLED – ENABLED]
Содержание Multilin F650
Страница 9: ...8 F650 Digital Bay Controller GEK 106310AB TABLE OF CONTENTS ...
Страница 147: ...4 74 F650 Digital Bay Controller GEK 106310AB 4 3 WEB SERVER 4 HUMAN INTERFACES SETTINGS ACTUAL VALUES 4 ...
Страница 323: ...5 176 F650 Digital Bay Controller GEK 106310AB 5 13 IEC 60870 5 103 PROTOCOL CONFIGURATION 5 SETTINGS 5 ...
Страница 443: ...7 74 F650 Digital Bay Controller GEK 106310AB 7 3 IEC 61850 CONFIGURATOR 7 IEC 61850 PROTOCOL 7 Figure 7 21 ...
Страница 457: ...7 88 F650 Digital Bay Controller GEK 106310AB 7 3 IEC 61850 CONFIGURATOR 7 IEC 61850 PROTOCOL 7 ...
Страница 513: ...10 28 F650 Digital Bay Controller GEK 106310AB 10 18 THERMAL IMAGE ELEMENT 49 10 COMMISSIONING 10 ...
Страница 529: ...12 6 F650 Digital Bay Controller GEK 106310AB 12 4 RELAY CONFIGURATION 12 FREQUENTLY ASKED QUESTIONS 12 ...
Страница 569: ...A 36 F650 Digital Bay Controller GEK 106310AB A 1 LOGIC OPERANDS APPENDIX A A ...
Страница 735: ...C 24 F650 Digital Bay Controller GEK 106310AB C 8 ANALOG INPUTS APPENDIX C C ...
Страница 743: ...D 8 F650 Digital Bay Controller GEK 106310AB D 5 IEC 60870 5 104 POINT LIST APPENDIX D D ...
Страница 755: ...F 10 F650 Digital Bay Controller GEK 106310AB F 1 IEC 60870 5 103 PROTOCOL APPENDIX F F ...
Страница 766: ...GEK 106310AB F650 Digital Bay Controller G 11 APPENDIX G G 1 FACTORY DEFAULT LOGIC G ...
Страница 767: ...G 12 F650 Digital Bay Controller GEK 106310AB G 1 FACTORY DEFAULT LOGIC APPENDIX G G ...
Страница 801: ...I 2 F650 Digital Bay Controller GEK 106310AB I 1 GE MULTILIN WARRANTY APPENDIX I I ...