GEK-113032A
W650 Wind Generator Protection System
5-75
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 5–69: 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.
5.5.3 OVERFREQUENCY ELEMENT (81O)
Setpoint >Control Elements > Overfrequency
81O is an overfrequency protection element. The pickup setting can be selected from 20.00 to 65.00 Hz, with a time delay
selectable between 0 and 900 seconds. The element-reset delay is from 0.00 to 900.00 seconds.
Table 5–70: 81O ELEMENT SETTINGS
The snapshot event setting enables or disables the snapshot event generation for this element.
SETPOINT > CONTROL ELEMENTS > UNDERFREQUENCY
UNDERFREQUENCY 1 > UNDERFREQUENCY 2 > UNDERFREQUENCY 3 > UNDERFREQUENCY 4
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
50
1 V
[30 : 500]
Snapshot event generation
Snapshot Events
ENABLED
N/A
[DISABLED – ENABLED]
SETPOINT > CONTROL ELEMENTS > OVERFREQUENCY
OVERFREQUENCY 1 > OVERFREQUENCY 2 > OVERFREQUENCY 3 > OVERFREQUENCY 4
SETTING DESCRIPTION
NAME
DEFAULT VALUE
STEP
RANGE
Function permission
Function
DISABLED
N/A
[DISABLED – ENABLED]
Pickup level
Pickup Level
50.50
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
50
1 V
[30 : 500]
Snapshot event generation
Snapshot Events
ENABLED
N/A
[DISABLED – ENABLED]
Содержание Multilin W650
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Страница 10: ...VIII W650 Wind Generator Protection System GEK 113032A TABLE OF CONTENTS ...
Страница 30: ...1 20 W650 Wind Generator Protection System GEK 113032A 1 4 W650 HARDWARE 1 GETTING STARTED 1 ...
Страница 140: ...4 72 W650 Wind Generator Protection System GEK 113032A 4 3 WEB SERVER 4 HUMAN INTERFACES 4 ...
Страница 360: ...7 48 W650 Wind Generator Protection System GEK 113032A 7 2 IEC 61850 PROFILE FOR W650 7 IEC 61850 PROTOCOL 7 ...
Страница 368: ...8 8 W650 Wind Generator Protection System GEK 113032A 8 4 OBJECT DICTIONARY 8 W650 CANOPEN PROFILE 8 ...
Страница 406: ...11 22 W650 Wind Generator Protection System GEK 113032A 11 15 RECLOSER 79 11 COMMISSIONING 11 ...
Страница 422: ...13 6 W650 Wind Generator Protection System GEK 113032A 13 4 RELAY CONFIGURATION 13 FREQUENTLY ASKED QUESTIONS 13 ...
Страница 446: ...A 22 W650 Wind Generator Protection System GEK 113032A A 1 LOGIC OPERANDS APPENDIXA A ...
Страница 596: ...D 8 W650 Wind Generator Protection System GEK 113032A D 5 IEC 60870 5 104 POINT LIST APPENDIXD D ...
Страница 622: ...F 2 W650 Wind Generator Protection System GEK 113032A F 1 GE MULTILIN WARRANTY APPENDIXF F ...